Method and device for evaluating cooling capacity of containment core

Abstract

The invention discloses a method and device for evaluating the cooling capacity of a containment core, and the method comprises the following steps: obtaining the type of an external super-design reference event, and determining a corresponding effect analysis method according to the type of the external super-design reference event; utilizing an effect analysis method to determine the structure effect of the containment under the external beyond design reference event, wherein the structure effect comprises one or more of the containment penetration thickness, the containment overall deformation corner and the containment local deformation displacement; and selecting a corresponding bearing capacity limit value for comparison according to the structural effect, and determining the reactor core cooling capacity of the containment vessel when an external design standard exceeding event occurs according to a comparison result, so that the safety of the nuclear power plant can still be ensured when the event occurs when the double-layer containment vessel redundancy design is cancelled, and the safety of the nuclear power plant is ensured. Economy of the nuclear power plant is improved and construction cost is saved.

Description

Technical Field

[0001] The invention relates to the technical field of external event protection design for nuclear power plants, and in particular to a method and device for evaluating the cooling capacity of a containment core. Background Art

[0002] Many countries have successively issued relevant specifications, clearly stipulating that the design of nuclear power plants must take into account the accidental and terrorist impacts of large commercial passenger aircraft. In my country, it has been clearly required that newly built power plants should have the ability to resist malicious impacts from large commercial aircraft. In order to resist the impact of large commercial aircraft, most countries in the world design special plants to resist the impact of large commercial aircraft when designing the nuclear island plant of nuclear power plants. The plant is functionally separated from the core shielding plant, and the two are independent of each other during design, resulting in a large design redundancy and poor economic efficiency. In order to optimize the design of the containment structure and improve the economy of the nuclear power structure, most researchers and nuclear power design units are currently considering canceling the special anti-aircraft impact structure, such as the APC shell of the "Hualong One", and instead consider conducting design optimization research on the original containment structure to enable it to resist aircraft impacts.

[0003] In addition, the impact of a large commercial aircraft is currently the main external beyond-design basis event that needs to be considered when designing nuclear power plants in my country. However, there are related scenarios that require nuclear power design units to conduct safety performance assessments of nuclear power plants when beyond-design basis events such as external hard missiles and explosions of fuel carried by aircraft occur. When different external events occur, the possible failure modes of the containment are different. For example, a large aircraft impact may cause overall damage to the containment, while a smaller hard missile impact is more likely to cause partial penetration damage to the containment. The analysis methods and acceptance criteria applicable to different external beyond-design basis events are different. At present, no relevant research has provided a protection assessment method applicable to single-layer nuclear containment against external beyond-design basis events.

[0004] CN114492080A discloses a method for evaluating the impact resistance of electronic detonators, which includes impact strength test; on-site impact load test and statistical analysis; inverse calculation of the probability distribution function of the real impact load peak in the blasting hole under the on-site blasting environment; construction of a stress-strength interference model to calculate the failure probability; and impact resistance evaluation. This method is used to evaluate the impact resistance of electronic detonators, and does not involve the evaluation of the relevant performance of the containment.

[0005] CN110110357A discloses a commercial large aircraft impact event analysis and evaluation method for nuclear power plants, which includes the following steps: determine the evaluation object in combination with the specific design of the nuclear power plant; determine the aircraft impact condition; perform impact analysis and evaluation on the evaluation object according to different impact effect evaluation methods; determine the damage range caused by different impact effects; determine the failure of the system or equipment; perform impact consequence evaluation to determine whether all impact conditions can meet the overall acceptance criteria, if so, the evaluation is completed; if not, identify the design weaknesses, take necessary design enhancement measures, and re-analyze and evaluate. This method is mainly based on the commercial large aircraft impact damage area, analyzes the failure of the system or equipment, and does not involve the protection performance evaluation of the containment.

[0006] In summary, the above two existing patents do not propose a method for evaluating the containment protection performance when an external beyond-design basis event occurs. When the double-layer containment redundant design is cancelled, it is difficult to ensure the safety of the nuclear power plant. Summary of the invention

[0007] Based on the above technical problems, the present invention proposes a method and device for evaluating the cooling capacity of the containment core, which solves the problem that there is a lack of a method for evaluating the protection performance of the containment in the prior art, and it is difficult to ensure the safety of the nuclear power plant when the double-layer containment redundant design is cancelled.

[0008] To achieve the above object, the present invention proposes a method for evaluating the containment core cooling capacity.

[0009] A method for evaluating the containment core cooling capacity, the method comprising:

[0010] Obtain the type of external beyond-design basis event, and determine the corresponding effect analysis method according to the type of external beyond-design basis event;

[0011] The structural effect of the containment under the external beyond-design basis event is determined by using the effect analysis method. The structural effect includes one or more of the penetration thickness of the containment, the overall deformation rotation angle of the containment, and the local deformation displacement of the containment;

[0012] The corresponding bearing capacity limit is selected according to the structural effect for comparison, and the core cooling capacity of the containment when an external beyond-design basis event occurs is determined based on the comparison results.

[0013] Furthermore, before selecting the corresponding bearing capacity limit value for comparison according to the structural effect, it also includes:

[0014] Determine the bearing capacity limit of the containment, which includes the containment penetration thickness limit, the containment overall deformation angle limit, and the containment local deformation displacement limit.

[0015] Furthermore, the types of external beyond-design basis events include hard missile penetration, aircraft impact, contact explosion and long-range explosion. The corresponding effect analysis method is determined according to the type of external beyond-design basis event, including:

[0016] When the type of the external beyond design basis event is hard missile penetration, the effect analysis method used is prototype test, or large-scale test, or numerical calculation, or empirical formula, or a combination thereof;

[0017] When the type of the external beyond design basis event is aircraft impact, the effect analysis method used is small-scale test, or numerical calculation, or a combination thereof;

[0018] When the type of the external beyond design basis event is contact explosion, the effect analysis method used is prototype test, or numerical calculation, or empirical formula, or a combination thereof;

[0019] When the type of the external beyond design basis event is a long-distance explosion, the effect analysis method used is a small-scale test, or numerical calculation, or a combination thereof.

[0020] Furthermore, the corresponding magnification factor of the prototype test is 1.1;

[0021] The corresponding magnification factor for the large-scale test is 1.2;

[0022] The corresponding magnification factor for the small-scale test is 1.4;

[0023] The corresponding magnification factor of the numerical calculation is 1.6;

[0024] The amplification factor corresponding to the empirical formula is 1.8.

[0025] Furthermore, the effect analysis method is used to determine the structural effects of the containment under external beyond-design basis events, including:

[0026] Determine the structural effect by using prototype test, large scale test, small scale test and numerical calculation, the structural effect is at least one of the containment penetration thickness, the containment overall deformation angle and the containment local deformation displacement;

[0027] The structural effects are determined using empirical formulas, which include the containment penetration thickness.

[0028] Furthermore, under the penetration of hard projectiles, the corresponding empirical formula is used to calculate the containment penetration thickness, including:

[0029] The penetration depth of hardened projectiles is calculated by formula 1:

[0030]

[0031] Among them, X is the penetration depth, M is the mass of the projectile, N is the projectile shape coefficient, V is the impact velocity of the projectile, D is the diameter of the projectile, K is a constant parameter, and f c is the compressive strength of concrete;

[0032] According to the penetration depth, the containment penetration thickness is determined by formula 2:

[0033]

[0034] Among them, h p is the containment penetration thickness;

[0035] The containment penetration thickness is magnified using the magnification factor corresponding to the empirical formula.

[0036] Furthermore, under the action of external explosion, the containment penetration thickness is calculated using the corresponding empirical formula, including:

[0037] The containment penetration thickness is calculated by formula 3. Formula 3:

[0038]

[0039] Among them, h z The initial containment penetration thickness under the explosion, W is the equivalent of trinitrotoluene explosive, C is the weight of the charged shell, and R is the distance between the explosive center and the containment surface;

[0040] The containment penetration thickness is magnified using the magnification factor corresponding to the empirical formula.

[0041] Furthermore, the limit value of the overall deformation angle of the containment is determined, including:

[0042] Conduct performance tests on the containment structure and obtain load-displacement curves;

[0043] Determine the displacement value corresponding to the load limit value according to the load-displacement curve;

[0044] Based on the displacement value, the limit value of the overall deformation angle of the containment is determined by formula 4. Formula 4: Among them, β c is the limit value of the overall deformation rotation angle of the containment, Δ is the displacement value, and L is the length of the component on which the performance test is carried out.

[0045] Furthermore, the corresponding bearing capacity limit is selected for comparison according to the structural effect, and the core cooling capacity of the containment when an external beyond-design basis event occurs is determined according to the comparison result, including:

[0046] When the structural effect determined by the effect analysis method is the containment penetration thickness, selecting the corresponding containment penetration thickness limit value for comparison;

[0047] If the containment penetration thickness is less than or equal to the containment penetration thickness limit value, determining that the containment still maintains the core cooling capability when the external beyond-design basis event occurs;

[0048] Alternatively, when the structural effect determined by the effect analysis method is the overall deformation angle of the containment, the corresponding limit value of the overall deformation angle of the containment is selected for comparison;

[0049] If the overall deformation rotation angle of the containment is less than or equal to the overall deformation rotation angle limit value of the containment, it is determined that the containment still maintains the core cooling capability when the external beyond-design basis event occurs;

[0050] Alternatively, when the structural effect determined by the effect analysis method is the local deformation displacement of the containment, the corresponding local deformation displacement limit value of the containment is selected for comparison;

[0051] If the local deformation displacement of the containment shell is less than or equal to the local deformation displacement limit value of the containment shell, it is determined that the containment shell still maintains the core cooling capability when the external beyond-design basis event occurs;

[0052] Alternatively, when the structural effect determined by the effect analysis method is the containment penetration thickness and the containment overall deformation angle, the corresponding containment penetration thickness limit value and the containment overall deformation angle limit value are selected for comparison;

[0053] If the penetration thickness of the containment shell is less than or equal to the limit value of the penetration thickness of the containment shell, and the overall deformation angle of the containment shell is less than or equal to the limit value of the overall deformation angle of the containment shell, it is determined that the containment shell still maintains the core cooling capability when the external beyond-design basis event occurs;

[0054] Alternatively, when the structural effect determined by the effect analysis method is the containment penetration thickness and the containment local deformation displacement, the corresponding containment penetration thickness limit value and the containment local deformation displacement limit value are selected for comparison;

[0055] If the containment penetration thickness is less than or equal to the containment penetration thickness limit value, and the containment local deformation displacement is less than or equal to the containment local deformation displacement limit value, it is determined that the containment still maintains the core cooling capability when the external beyond-design basis event occurs;

[0056] Alternatively, when the structural effect determined by the effect analysis method is the overall deformation rotation angle of the containment and the local deformation displacement of the containment, the corresponding limit value of the overall deformation rotation angle of the containment and the limit value of the local deformation displacement of the containment are selected for comparison;

[0057] If the overall deformation rotation angle of the containment shell is less than or equal to the overall deformation rotation angle limit value of the containment shell, and the local deformation displacement of the containment shell is less than or equal to the local deformation displacement limit value of the containment shell, it is determined that the containment shell still maintains the core cooling capability when the external beyond-design basis event occurs;

[0058] Alternatively, when the structural effect of the containment under the external beyond-design basis event determined by the effect analysis method is the containment penetration thickness, the containment overall deformation angle and the containment local deformation displacement, the corresponding containment penetration thickness limit value, the containment overall deformation angle limit value and the containment local deformation displacement limit value are selected for comparison;

[0059] If the containment penetration thickness is less than or equal to the containment penetration thickness limit value, and the containment overall deformation angle is less than or equal to the containment overall deformation angle limit value, and the containment local deformation displacement is less than or equal to the containment local deformation displacement limit value, it is determined that the containment still maintains the core cooling capability when the external beyond design basis event occurs.

[0060] In order to achieve the same purpose as the above method, the present invention also proposes a device for evaluating the containment core cooling capacity.

[0061] A device for evaluating the cooling capacity of a containment core, comprising:

[0062] An acquisition module is used to acquire the type of the external beyond-design basis event and determine the corresponding effect analysis method according to the type of the external beyond-design basis event;

[0063] A determination module, used to determine the structural effect of the containment under the external beyond-design basis event by using an effect analysis method, wherein the structural effect includes one or more of the penetration thickness of the containment, the overall deformation rotation angle of the containment, and the local deformation displacement of the containment;

[0064] The comparison module is used to select the corresponding bearing capacity limit value for comparison according to the structural effect, and determine the core cooling capacity of the containment when an external beyond-design basis event occurs according to the comparison result.

[0065] Furthermore, before selecting the corresponding bearing capacity limit value for comparison according to the structural effect, it also includes:

[0066] Determine the bearing capacity limit of the containment, which includes the containment penetration thickness limit, the containment overall deformation angle limit, and the containment local deformation displacement limit.

[0067] Furthermore, the types of external beyond-design basis events include hard missile penetration, aircraft impact, contact explosion and long-range explosion. The acquisition module is used to:

[0068] When the type of the external beyond design basis event is hard missile penetration, the effect analysis method used is prototype test, or large-scale test, or numerical calculation, or empirical formula, or a combination thereof;

[0069] When the type of the external beyond design basis event is aircraft impact, the effect analysis method used is small-scale test, or numerical calculation, or a combination thereof;

[0070] When the type of the external beyond design basis event is contact explosion, the effect analysis method used is prototype test, or numerical calculation, or empirical formula, or a combination thereof;

[0071] When the type of the external beyond design basis event is a long-distance explosion, the effect analysis method used is a small-scale test, or numerical calculation, or a combination thereof.

[0072] Furthermore, the corresponding magnification factor of the prototype test is 1.1;

[0073] The corresponding magnification factor for the large-scale test is 1.2;

[0074] The corresponding magnification factor for the small-scale test is 1.4;

[0075] The corresponding magnification factor of the numerical calculation is 1.6;

[0076] The amplification factor corresponding to the empirical formula is 1.8.

[0077] Further, a module is determined for:

[0078] Determine the structural effect by using prototype test, large scale test, small scale test and numerical calculation, the structural effect is at least one of the containment penetration thickness, the containment overall deformation angle and the containment local deformation displacement;

[0079] The structural effects are determined using empirical formulas, which include the containment penetration thickness.

[0080] Furthermore, under the penetration of hard projectiles, the corresponding empirical formula is used to calculate the containment penetration thickness, including:

[0081] The penetration depth of hardened projectiles is calculated by formula 1:

[0082]

[0083] Among them, X is the penetration depth, M is the mass of the projectile, N is the projectile shape coefficient, V is the impact velocity of the projectile, D is the diameter of the projectile, K is a constant parameter, and f c is the compressive strength of concrete;

[0084] According to the penetration depth, the containment penetration thickness is determined by formula 2:

[0085]

[0086] Among them, h p is the containment penetration thickness;

[0087] The containment penetration thickness is magnified using the magnification factor corresponding to the empirical formula.

[0088] Furthermore, under the action of external explosion, the containment penetration thickness is calculated using the corresponding empirical formula, including:

[0089] The containment penetration thickness is calculated by formula 3. Formula 3:

[0090]

[0091] Among them, h z The initial containment penetration thickness under the explosion, W is the equivalent of trinitrotoluene explosive, C is the weight of the charged shell, and R is the distance between the explosive explosion center and the containment surface;

[0092] The containment penetration thickness is magnified using the magnification factor corresponding to the empirical formula.

[0093] Furthermore, the limit value of the overall deformation angle of the containment is determined, including:

[0094] Conduct performance tests on the containment structure and obtain load-displacement curves;

[0095] Determine the displacement value corresponding to the load limit value according to the load-displacement curve;

[0096] Based on the displacement value, the limit value of the overall deformation angle of the containment is determined by formula 4. Formula 4: Among them, β c is the limit value of the overall deformation rotation angle of the containment, Δ is the displacement value, and L is the length of the component on which the performance test is carried out.

[0097] Furthermore, the comparison module is used to:

[0098] When the structural effect determined by the effect analysis method is the containment penetration thickness, selecting the corresponding containment penetration thickness limit value for comparison;

[0099] If the containment penetration thickness is less than or equal to the containment penetration thickness limit value, determining that the containment still maintains the core cooling capability when the external beyond-design basis event occurs;

[0100] Alternatively, when the structural effect determined by the effect analysis method is the overall deformation angle of the containment, the corresponding limit value of the overall deformation angle of the containment is selected for comparison;

[0101] If the overall deformation rotation angle of the containment is less than or equal to the overall deformation rotation angle limit value of the containment, it is determined that the containment still maintains the core cooling capability when the external beyond-design basis event occurs;

[0102] Alternatively, when the structural effect determined by the effect analysis method is the local deformation displacement of the containment, the corresponding local deformation displacement limit value of the containment is selected for comparison;

[0103] If the local deformation displacement of the containment shell is less than or equal to the local deformation displacement limit value of the containment shell, it is determined that the containment shell still maintains the core cooling capability when the external beyond-design basis event occurs;

[0104] Alternatively, when the structural effect determined by the effect analysis method is the containment penetration thickness and the containment overall deformation angle, the corresponding containment penetration thickness limit value and the containment overall deformation angle limit value are selected for comparison;

[0105] If the penetration thickness of the containment shell is less than or equal to the limit value of the penetration thickness of the containment shell, and the overall deformation angle of the containment shell is less than or equal to the limit value of the overall deformation angle of the containment shell, it is determined that the containment shell still maintains the core cooling capability when the external beyond-design basis event occurs;

[0106] Alternatively, when the structural effect determined by the effect analysis method is the containment penetration thickness and the containment local deformation displacement, the corresponding containment penetration thickness limit value and the containment local deformation displacement limit value are selected for comparison;

[0107] If the containment penetration thickness is less than or equal to the containment penetration thickness limit value, and the containment local deformation displacement is less than or equal to the containment local deformation displacement limit value, it is determined that the containment still maintains the core cooling capability when the external beyond-design basis event occurs;

[0108] Alternatively, when the structural effect determined by the effect analysis method is the overall deformation rotation angle of the containment and the local deformation displacement of the containment, the corresponding limit value of the overall deformation rotation angle of the containment and the limit value of the local deformation displacement of the containment are selected for comparison;

[0109] If the overall deformation rotation angle of the containment shell is less than or equal to the overall deformation rotation angle limit value of the containment shell, and the local deformation displacement of the containment shell is less than or equal to the local deformation displacement limit value of the containment shell, it is determined that the containment shell still maintains the core cooling capability when the external beyond-design basis event occurs;

[0110] Alternatively, when the structural effect of the containment under the external beyond-design basis event determined by the effect analysis method is the containment penetration thickness, the containment overall deformation angle and the containment local deformation displacement, the corresponding containment penetration thickness limit value, the containment overall deformation angle limit value and the containment local deformation displacement limit value are selected for comparison;

[0111] If the containment penetration thickness is less than or equal to the containment penetration thickness limit value, and the containment overall deformation angle is less than or equal to the containment overall deformation angle limit value, and the containment local deformation displacement is less than or equal to the containment local deformation displacement limit value, it is determined that the containment still maintains the core cooling capability when the external beyond design basis event occurs.

[0112] Based on the above technical solution, the present invention has at least the following beneficial effects:

[0113] 1. The present invention provides an effect analysis method that can be used when an external beyond-design basis event occurs, and sets different effect amplification factors according to the confidence level of the effect analysis method to improve the safety of nuclear power plants. By comparing the structural effect obtained by the effect analysis method with the corresponding bearing capacity limit, the core cooling capacity evaluation when an external beyond-design basis event occurs is achieved, so that when the double-layer containment redundant design is cancelled, the safety of the nuclear power plant can still be ensured when such an event occurs, thereby improving the economy of the nuclear power plant and saving construction costs.

[0114] 2. The present invention proposes to determine the corresponding effect analysis method according to the type of external beyond-design basis event, and utilizes the effect analysis method to determine the containment shell penetration thickness, the containment local deformation angle limit and the containment local deformation under the external beyond-design basis event. By refining and determining the structural effect of the containment, the assessment accuracy of the containment core cooling capacity can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0115] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0116] Figure 1 A schematic diagram of the protection assessment process of the single-layer nuclear containment against external beyond-design basis events proposed by the present invention;

[0117] Figure 2 A flow chart of a method for evaluating the containment core cooling capacity according to an embodiment of the present invention;

[0118] Figure 3 A flow chart of determining the penetration thickness of a containment shell by an empirical formula when a hardened projectile penetrates a prestressed reinforced concrete structure in one embodiment of the present invention;

[0119] Figure 4 A flow chart for determining the limit value of the overall deformation angle of the containment in one embodiment of the present invention;

[0120] Figure 5 A schematic diagram of a load-displacement curve extracted in one embodiment of the present invention;

[0121] Figure 6 It is a schematic diagram of the arrangement of the containment and internal structural equipment in one embodiment of the present invention;

[0122] Figure 7 The present invention is a schematic diagram of a device for evaluating the containment core cooling capacity according to an embodiment of the present invention. DETAILED DESCRIPTION

[0123] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0124] The present invention is further described in detail below in conjunction with specific embodiments. These embodiments should not be construed as limiting the scope of protection claimed by the present invention.

[0125] Example

[0126] In order to solve the problem that there is a lack of a containment protection performance evaluation method in the prior art and it is difficult to ensure the safety of a nuclear power plant when the double-layer containment redundant design is cancelled, the present invention proposes a method and device for evaluating the containment core cooling capacity.

[0127] To achieve the above object, the present invention proposes a method for evaluating the containment core cooling capacity. Figure 1As shown in the figure, this method analyzes the structural response of the containment when an external event occurs and the bearing capacity of the containment structure, and provides an evaluation method for the core cooling capacity of the nuclear power plant containment under the influence of external events such as external hard missile penetration, aircraft impact, and explosion. Different magnification factors are set for different effect analysis methods, and the core cooling capacity of the containment is evaluated based on the structural effect determined by the effect analysis method and the corresponding bearing capacity comparison.

[0128] like Figure 2 A flow chart of a method for evaluating the containment core cooling capacity according to an embodiment of the present invention is shown in FIG. 1 , and the method comprises the following steps:

[0129] S1. Obtain the type of external beyond-design basis event and determine the corresponding effect analysis method according to the type of external beyond-design basis event.

[0130] According to the site of the nuclear power plant and regulatory requirements, the containment needs to consider several beyond-design basis events such as the impact of a certain type of aircraft, hard missiles, and external explosions. In general, the types of external beyond-design basis events include hard missile penetration, aircraft impact, contact explosion, and long-distance explosion. The present invention determines the corresponding effect analysis method based on the priorities of prototype tests, large-scale tests, small-scale tests, numerical calculations, and empirical formulas, combined with actual technical, economic, and time conditions. The confidence of the results obtained by the methods with high priority is also high, and the confidence of the results obtained by the methods with low priority is also low.

[0131] For hard missile penetration events, considering that hard missiles are generally small in size, a portion of the containment can be cut off for prototype testing, large-scale testing, numerical calculations, empirical formulas, or a combination of two or more of the above tests.

[0132] Taking into account factors such as cost, it is extremely unlikely to conduct prototype tests when an aircraft impacts the containment, and the possibility of conducting large-scale tests is also relatively small. Therefore, when the type of external beyond-design basis event is an aircraft impact, it is recommended that the effect analysis methods include small-scale tests and numerical calculations, that is, the effect analysis can be carried out through small-scale tests, numerical calculations, or a combination of the two test methods.

[0133] When an explosion occurs outside the containment, the damage to the containment is related to factors such as the distance between the explosive and the containment and the explosive equivalent. Different analysis methods are suitable for different situations. For example, when the explosive equivalent is large and the distance from the containment is far, it may cause the overall deformation of the containment. In order to avoid boundary effects, if prototype tests or large-scale tests are used, the test volume is large and difficult to achieve. Therefore, the corresponding effect analysis method can use small-scale tests, or numerical calculations, or a combination of the two methods. If the explosive is close to the containment, it may cause local penetration of the containment. Local prototype tests, or numerical calculations, or empirical formulas, or a combination of the above-mentioned test methods can be used to carry out effect assessment and analysis.

[0134] Furthermore, the above five effect analysis methods correspond to a magnification factor respectively, among which the magnification factor corresponding to the prototype test is 1.1; the magnification factor corresponding to the large-scale test is 1.2; the magnification factor corresponding to the small-scale test is 1.4; the magnification factor corresponding to the numerical calculation is 1.6; and the magnification factor corresponding to the empirical formula is 1.8. After the effect analysis is carried out based on the above effect analysis methods and the corresponding structural effect is obtained, the structural effect result needs to be amplified to obtain the effect result for subsequent evaluation.

[0135] S2, use the effect analysis method to determine the structural effects of the containment under external beyond design basis events.

[0136] The structural effect includes one or more of the containment penetration thickness, the overall deformation angle of the containment, and the local deformation displacement of the containment. Based on the actual accident scenario, different effect analysis methods can determine different structural effects. Specifically, the structural effects determined by prototype tests, large-scale tests, small-scale tests and numerical calculations include at least one of the containment penetration thickness, the overall deformation angle of the containment, and the local deformation displacement of the containment. The structural effect determined by the empirical formula is the containment penetration thickness.

[0137] At present, there are empirical formulas available for the penetration of hardened projectiles into prestressed reinforced concrete structures, such as Figure 3 The process of determining the containment penetration thickness by empirical formula when a hardened projectile penetrates a prestressed reinforced concrete structure is shown in FIG. The specific steps are as follows:

[0138] S201, under the penetration of hard projectiles, calculate the containment penetration thickness using the corresponding empirical formula.

[0139] The penetration depth of hardened projectiles is calculated by formula 1:

[0140]

[0141] Among them, X is the penetration depth, M is the mass of the projectile, N is the projectile shape coefficient, V is the impact velocity of the projectile, D is the diameter of the projectile, K is a constant parameter, and f c is the compressive strength of concrete. In a specific embodiment of the present invention, K = 3.8*10 -5 When the bullet is a flat-headed bullet, N=0.72, when the bullet is a blunt-headed bullet, N=0.84, when the bullet is a spherical bullet, N=1.0, and when the bullet is a pointed bullet, N=1.14.

[0142] In actual calculation, the ratio range of X to D is pre-assumed, and the corresponding formula is used for calculation. If the calculated ratio of X to D does not meet the previously assumed ratio, another formula is substituted for calculation. For example, it is pre-assumed that the ratio range of X to D is less than or equal to 2.0, and the corresponding formula is used. X is calculated. If the ratio of X to D is less than or equal to 2.0, the penetration depth of the hardened projectile is the calculated X. On the contrary, if the ratio of X to D is greater than 2.0, Calculate the penetration depth of hardened projectiles.

[0143] S202, according to the penetration depth, determine the containment penetration thickness using Formula 2.

[0144] The formula 2 is: Among them, h p is the containment penetration thickness. Substituting the above penetration depth X into Formula 2, the containment penetration thickness can be determined.

[0145] S203, amplifying the penetration thickness of the containment using an amplification factor corresponding to an empirical formula.

[0146] The magnification factor corresponding to the empirical formula is 1.8. The containment penetration thickness determined in step S202 is multiplied by the magnification factor to obtain the containment penetration thickness d used to evaluate the containment protection performance. p .

[0147] Furthermore, under the action of external explosion, the corresponding empirical formula is used to calculate the containment penetration thickness, including the following two steps:

[0148] First, the containment penetration thickness is calculated using Formula 3. Formula 3:

[0149]

[0150] Among them, h z Initial containment penetration thickness under explosion, W is the equivalent of trinitrotoluene explosive, C is the weight of the charged shell, and R is the distance between the explosive center and the containment surface.

[0151] Secondly, the containment penetration thickness is magnified using the magnification factor corresponding to the empirical formula. That is, the magnification factor 1.8 corresponding to the empirical formula is multiplied by the containment penetration thickness obtained by formula 3 to obtain the magnified containment penetration thickness d p .

[0152] S3, select the corresponding bearing capacity limit value for comparison according to the structural effect, and determine the core cooling capacity of the containment when an external beyond-design basis event occurs based on the comparison result.

[0153] Furthermore, before selecting the corresponding bearing capacity limit value for comparison according to the structural effect, the method further includes: S4, determining the bearing capacity limit value of the containment.

[0154] The load-bearing capacity limit includes the containment penetration thickness limit, the containment overall deformation angle limit, and the containment local deformation displacement limit. The load-bearing capacity analysis of the containment in this embodiment includes the following two aspects: (1) First, analyze the possible failure modes of the containment when an external event occurs and the situations that may lead to the inability to maintain core cooling, such as the containment being penetrated, the overall deformation of the containment being large and affecting the performance, and the local displacement of the containment being large and affecting the normal operation of the internal equipment. (2) According to the corresponding containment failure mode, analyze the load-bearing capacity of the containment and determine the load-bearing capacity limit of the containment.

[0155] Furthermore, based on the containment failure modes such as local penetration, overall deformation failure, and local deformation that significantly affects internal equipment, the containment bearing capacity analysis is carried out when the corresponding damage mode occurs.

[0156] (1) For local penetration failure mode

[0157] For beyond-design basis events, it is required that the containment shell does not suffer through-damage when an external event occurs. Therefore, for the failure mode of local penetration, the wall thickness of the containment shell that can withstand local impact is the containment shell penetration thickness limit value d.

[0158] (2) For overall deformation failure mode

[0159] For the failure mode of the containment shell that causes overall deformation after an external event, it is necessary to conduct experiments to study and analyze the overall performance of the containment shell structure, and then conduct numerical simulation analysis to expand the analysis of working conditions, and finally give the rotation angle limit of the structure based on a large amount of data. Figure 4 The flowchart for determining the limit value of the overall deformation rotation angle of the containment shell under the overall deformation failure mode of the containment shell is shown in FIG. 1 , and the flowchart includes the following three steps:

[0160] S301, conduct performance tests on the containment structure and obtain load-displacement curves.

[0161] S302: Determine the displacement value corresponding to the load limit value according to the load-displacement curve.

[0162] S303, based on the displacement value, determine the limit value of the overall deformation angle of the containment through Formula 4.

[0163] Formula 4: Among them, β c is the limit value of the overall deformation rotation angle of the containment, Δ is the displacement value, and L is the length of the component on which the performance test is carried out.

[0164] For the prestressed reinforced concrete containment structure of this embodiment, a bending test can be designed to extract the loaded load-displacement curve, and then obtain the displacement value at which the structure loses functionality, that is, the displacement value corresponding to the load limit value, such as Figure 5 : A schematic diagram of the load-displacement curve extracted in this embodiment is shown in the figure, in which the horizontal coordinate is displacement and the vertical coordinate is load. The horizontal coordinate displacement value corresponding to point A is the displacement value Δ corresponding to the load limit value. The overall deformation angle limit value of the containment shell can be determined by formula 4. The overall deformation angle limit value of the containment shell determined in this embodiment is 2°.

[0165] (3) For local deformation failure mode

[0166] For different reactor types, the internal structure of the containment and the arrangement of the equipment inside the containment are different. The main purpose of verifying the local deformation is to ensure that when an external beyond-design basis event occurs, the local deformation of the containment will not contact the internal structure or equipment, causing the containment safety system to fail to work normally. The present invention proposes to count the distance between the internal equipment and the containment at the location where the containment is affected by the external event, and set this value as the local deformation displacement limit value of the containment when the external event occurs. For this embodiment, it is required that when an external event occurs, the local deformation of the containment structure will not contact the internal equipment such as the ring hanger, and the internal structure. Therefore, this embodiment uses the minimum distance between the containment and the internal structure and equipment as the local deformation displacement limit value of the containment, such as Figure 6 The schematic diagram of the layout of the containment and internal structural equipment is shown in Figure 6 The distance between the central ring beam b and the containment a is δ1, the distance between the equipment c and the containment a is δ2, and the local deformation displacement limit value of the containment δ c is δ1, δ2, ... δ n The minimum value in .

[0167] In the comparative evaluation of step S3, if it can be ensured that the corresponding containment bearing capacity limit is greater than the structural effect when an external event occurs, it is determined that the containment can guarantee the core cooling capacity when an external beyond-design basis event occurs. Specifically, the corresponding bearing capacity limit is selected for comparison according to the structural effect, including the following situations:

[0168] (1) When the structural effect determined by the effect analysis method is the containment penetration thickness, the corresponding containment penetration thickness limit value is selected for comparison. If the containment penetration thickness is less than or equal to the containment penetration thickness limit value, it is determined that the containment still maintains the core cooling capacity when an external beyond-design basis event occurs.

[0169] (2) When the structural effect determined by the effect analysis method is the overall deformation angle of the containment, the corresponding limit value of the overall deformation angle of the containment is selected for comparison. If the overall deformation angle of the containment is less than or equal to the limit value of the overall deformation angle of the containment, it is determined that the containment still maintains the core cooling capability when an external beyond-design basis event occurs.

[0170] (3) When the structural effect determined by the effect analysis method is the local deformation displacement of the containment, the corresponding local deformation displacement limit value of the containment is selected for comparison. If the local deformation displacement of the containment is less than or equal to the local deformation displacement limit value of the containment, it is determined that the containment still maintains the core cooling capacity when an external beyond-design basis event occurs;

[0171] (4) When the structural effects determined by the effect analysis method are the containment penetration thickness and the containment overall deformation angle, the corresponding containment penetration thickness limit value and the containment overall deformation angle limit value are selected for comparison. If the containment penetration thickness is less than or equal to the containment penetration thickness limit value, and the containment overall deformation angle is less than or equal to the containment overall deformation angle limit value, it is determined that the containment still maintains the core cooling capability when an external beyond-design basis event occurs.

[0172] (5) When the structural effects determined by the effect analysis method are the containment penetration thickness and the containment local deformation displacement, the corresponding containment penetration thickness limit value and the containment local deformation displacement limit value are selected for comparison. If the containment penetration thickness is less than or equal to the containment penetration thickness limit value, and the containment local deformation displacement is less than or equal to the containment local deformation displacement limit value, it is determined that the containment still maintains the core cooling capability when an external beyond-design basis event occurs.

[0173] (6) When the structural effects determined by the effect analysis method are the global deformation angle of the containment and the local deformation displacement of the containment, the corresponding global deformation angle limit value of the containment and the local deformation displacement limit value of the containment are selected for comparison. If the global deformation angle of the containment is less than or equal to the global deformation angle limit value of the containment, and the local deformation displacement of the containment is less than or equal to the local deformation displacement limit value of the containment, it is determined that the containment still maintains the core cooling capability when an external beyond-design basis event occurs.

[0174] (7) When the structural effects of the containment under an external beyond design basis event determined by the effect analysis method are the containment penetration thickness, the containment overall deformation angle and the containment local deformation displacement, the corresponding containment penetration thickness limit value, the containment overall deformation angle limit value and the containment local deformation displacement limit value are selected for comparison. If the containment penetration thickness is less than or equal to the containment penetration thickness limit value, and the containment overall deformation angle is less than or equal to the containment overall deformation angle limit value, and the containment local deformation displacement is less than or equal to the containment local deformation displacement limit value, it is determined that the containment still maintains the core cooling capability when an external beyond design basis event occurs.

[0175] In order to achieve the same purpose as the above method, the present invention also proposes a device for evaluating the containment core cooling capacity.

[0176] like Figure 7 A schematic diagram of a device for evaluating the containment core cooling capacity is shown in FIG. Figure 7 As shown, the device includes an acquisition module 71, a determination module 72 and a comparison module 73. The functions of each module will be described in detail below.

[0177] The acquisition module 71 is used to acquire the type of the external beyond-design basis event and determine the corresponding effect analysis method according to the type of the external beyond-design basis event.

[0178] Furthermore, the types of external beyond-design basis events include hard missile penetration, aircraft impact, contact explosion and long-range explosion. The acquisition module is used to:

[0179] When the type of the external beyond design basis event is hard missile penetration, the effect analysis method used is prototype test, or large-scale test, or numerical calculation, or empirical formula, or a combination thereof;

[0180] When the type of the external beyond design basis event is aircraft impact, the effect analysis method used is small-scale test, or numerical calculation, or a combination thereof;

[0181] When the type of the external beyond design basis event is contact explosion, the effect analysis method used is prototype test, or numerical calculation, or empirical formula, or a combination thereof;

[0182] When the type of the external beyond design basis event is a long-distance explosion, the effect analysis method used is a small-scale test, or numerical calculation, or a combination thereof.

[0183] Furthermore, the magnification factor corresponding to the prototype test is 1.1.

[0184] The corresponding magnification factor for the large-scale test is 1.2.

[0185] The corresponding magnification factor for the small-scale experiment is 1.4.

[0186] The corresponding magnification factor of the numerical calculation is 1.6.

[0187] The amplification factor corresponding to the empirical formula is 1.8.

[0188] The determination module 72 is used to determine the structural effect of the containment under the external beyond-design basis event by using the effect analysis method, wherein the structural effect includes one or more of the penetration thickness of the containment, the overall deformation rotation angle of the containment, and the local deformation displacement of the containment.

[0189] Further, the determination module 72 is used to:

[0190] The structural effect is determined by using prototype tests, large-scale tests, small-scale tests and numerical calculations. The structural effect is at least one of the penetration thickness of the containment, the overall deformation angle of the containment, and the local deformation displacement of the containment.

[0191] The structural effects are determined using empirical formulas, which include the containment penetration thickness.

[0192] Furthermore, under the penetration of hard projectiles, the corresponding empirical formula is used to calculate the containment penetration thickness, including:

[0193] The penetration depth of hardened projectiles is calculated by formula 1:

[0194]

[0195] Among them, X is the penetration depth, M is the mass of the projectile, N is the projectile shape coefficient, V is the impact velocity of the projectile, D is the diameter of the projectile, K is a constant parameter, and f c is the compressive strength of concrete.

[0196] According to the penetration depth, the containment penetration thickness is determined by formula 2:

[0197]

[0198] Among them, h p is the containment penetration thickness.

[0199] The containment penetration thickness is magnified using the magnification factor corresponding to the empirical formula.

[0200] Furthermore, under the action of external explosion, the containment penetration thickness is calculated using the corresponding empirical formula, including:

[0201] The containment penetration thickness is calculated by formula 3. Formula 3:

[0202]

[0203] Among them, h z Initial containment penetration thickness under explosion, W is the equivalent of trinitrotoluene explosive, C is the weight of the charged shell, and R is the distance between the explosive center and the containment surface.

[0204] The containment penetration thickness is magnified using the magnification factor corresponding to the empirical formula.

[0205] The comparison module 73 is used to select the corresponding bearing capacity limit value for comparison according to the structural effect, and determine the core cooling capacity of the containment when an external beyond-design basis event occurs according to the comparison result.

[0206] Furthermore, before selecting the corresponding bearing capacity limit value for comparison according to the structural effect, it also includes:

[0207] Determine the bearing capacity limit of the containment, which includes the containment penetration thickness limit, the containment overall deformation angle limit, and the containment local deformation displacement limit.

[0208] Furthermore, the limit value of the overall deformation angle of the containment is determined, including:

[0209] Carry out performance tests on the containment structure and obtain the load-displacement curve.

[0210] Determine the displacement value corresponding to the load limit value based on the load-displacement curve.

[0211] Based on the displacement value, the limit value of the overall deformation angle of the containment is determined by formula 4. Formula 4: Among them, β c is the limit value of the overall deformation rotation angle of the containment, Δ is the displacement value, and L is the length of the component on which the performance test is carried out.

[0212] Furthermore, the comparison module 73 is used to:

[0213] When the structural effect determined by the effect analysis method is the containment penetration thickness, selecting the corresponding containment penetration thickness limit value for comparison;

[0214] If the containment penetration thickness is less than or equal to the containment penetration thickness limit value, determining that the containment still maintains the core cooling capability when the external beyond-design basis event occurs;

[0215] Alternatively, when the structural effect determined by the effect analysis method is the overall deformation angle of the containment, the corresponding limit value of the overall deformation angle of the containment is selected for comparison;

[0216] If the overall deformation rotation angle of the containment is less than or equal to the overall deformation rotation angle limit value of the containment, it is determined that the containment still maintains the core cooling capability when the external beyond-design basis event occurs;

[0217] Alternatively, when the structural effect determined by the effect analysis method is the local deformation displacement of the containment, the corresponding local deformation displacement limit value of the containment is selected for comparison;

[0218] If the local deformation displacement of the containment shell is less than or equal to the local deformation displacement limit value of the containment shell, it is determined that the containment shell still maintains the core cooling capability when the external beyond-design basis event occurs;

[0219] Alternatively, when the structural effect determined by the effect analysis method is the containment penetration thickness and the containment overall deformation angle, the corresponding containment penetration thickness limit value and the containment overall deformation angle limit value are selected for comparison;

[0220] If the penetration thickness of the containment shell is less than or equal to the limit value of the penetration thickness of the containment shell, and the overall deformation angle of the containment shell is less than or equal to the limit value of the overall deformation angle of the containment shell, it is determined that the containment shell still maintains the core cooling capability when the external beyond-design basis event occurs;

[0221] Alternatively, when the structural effect determined by the effect analysis method is the containment penetration thickness and the containment local deformation displacement, the corresponding containment penetration thickness limit value and the containment local deformation displacement limit value are selected for comparison;

[0222] If the containment penetration thickness is less than or equal to the containment penetration thickness limit value, and the containment local deformation displacement is less than or equal to the containment local deformation displacement limit value, it is determined that the containment still maintains the core cooling capability when the external beyond-design basis event occurs;

[0223] Alternatively, when the structural effect determined by the effect analysis method is the overall deformation rotation angle of the containment and the local deformation displacement of the containment, the corresponding limit value of the overall deformation rotation angle of the containment and the limit value of the local deformation displacement of the containment are selected for comparison;

[0224] If the overall deformation rotation angle of the containment shell is less than or equal to the overall deformation rotation angle limit value of the containment shell, and the local deformation displacement of the containment shell is less than or equal to the local deformation displacement limit value of the containment shell, it is determined that the containment shell still maintains the core cooling capability when the external beyond-design basis event occurs;

[0225] Alternatively, when the structural effect of the containment under the external beyond-design basis event determined by the effect analysis method is the containment penetration thickness, the containment overall deformation angle and the containment local deformation displacement, the corresponding containment penetration thickness limit value, the containment overall deformation angle limit value and the containment local deformation displacement limit value are selected for comparison;

[0226] If the containment penetration thickness is less than or equal to the containment penetration thickness limit value, and the containment overall deformation angle is less than or equal to the containment overall deformation angle limit value, and the containment local deformation displacement is less than or equal to the containment local deformation displacement limit value, it is determined that the containment still maintains the core cooling capability when the external beyond design basis event occurs.

[0227] It should be understood that a device for evaluating the cooling capacity of a containment core is consistent with the description of a corresponding method for evaluating the cooling capacity of a containment core, so it will not be described in detail in this embodiment.

[0228] In summary, it can be seen from the above description that the above embodiments of the present invention achieve the following technical effects:

[0229] 1. The present invention provides an effect analysis method that can be used when an external beyond-design basis event occurs, and sets different effect amplification factors according to the confidence level of the effect analysis method to improve the safety of nuclear power plants. By comparing the structural effect obtained by the effect analysis method with the corresponding bearing capacity limit, the core cooling capacity evaluation when an external beyond-design basis event occurs is achieved, so that when the double-layer containment redundant design is cancelled, the safety of the nuclear power plant can still be ensured when such an event occurs, thereby improving the economy of the nuclear power plant and saving construction costs.

[0230] 2. The present invention proposes to determine the corresponding effect analysis method according to the type of external beyond-design basis event, and utilizes the effect analysis method to determine the containment shell penetration thickness, the containment local deformation angle limit and the containment local deformation under the external beyond-design basis event. By refining and determining the structural effect of the containment, the assessment accuracy of the containment core cooling capacity can be improved.

[0231] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0232] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0233] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, which can be embodied in any computer-readable medium for use by an instruction execution system, apparatus or device (such as a computer-based system, a system including a processor or other system that can fetch instructions from an instruction execution system, apparatus or device and execute instructions), or used in combination with these instruction execution systems, apparatuses or devices.

[0234] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0235] It should be noted that, in the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

Claims

1. A method for evaluating the containment core cooling capacity, characterized in that: include: Acquiring the type of an external beyond-design basis event, and determining a corresponding effect analysis method according to the type of the external beyond-design basis event; Determine the structural effect of the containment under the external beyond-design basis event by using the effect analysis method, wherein the structural effect includes one or more of the penetration thickness of the containment, the overall deformation rotation angle of the containment, and the local deformation displacement of the containment; A corresponding bearing capacity limit is selected according to the structural effect for comparison, and the core cooling capacity of the containment vessel when the external beyond-design basis event occurs is determined according to the comparison result.

2. The method according to claim 1, characterized in that Before selecting the corresponding bearing capacity limit value for comparison according to the structural effect, it also includes: The load-bearing capacity limit of the containment is determined, wherein the load-bearing capacity limit includes the containment penetration thickness limit, the containment overall deformation rotation angle limit, and the containment local deformation displacement limit.

3. The method according to claim 1, characterized in that The types of external beyond-design basis events include hard missile penetration, aircraft impact, contact explosion and long-range explosion. The corresponding effect analysis method is determined according to the type of the external beyond-design basis event, including: When the type of the external beyond design basis event is hard missile penetration, the effect analysis method used is prototype test, or large-scale test, or numerical calculation, or empirical formula, or a combination thereof; When the type of the external beyond design basis event is aircraft impact, the effect analysis method used is small-scale test, or numerical calculation, or a combination thereof; When the type of the external beyond design basis event is contact explosion, the effect analysis method used is prototype test, or numerical calculation, or empirical formula, or a combination thereof; When the type of the external beyond design basis event is a long-distance explosion, the effect analysis method used is a small-scale test, or numerical calculation, or a combination thereof.

4. The method according to claim 3, characterized in that The magnification factor corresponding to the prototype test is 1.1; The magnification factor corresponding to the large-scale test is 1.2; The magnification factor corresponding to the small-scale test is 1.4; The amplification factor corresponding to the numerical calculation is 1.6; The amplification factor corresponding to the empirical formula is 1.

8.

5. The method according to claim 4, characterized in that The structural effect of the containment under the external beyond-design basis event is determined by using the effect analysis method, including: Determine the structural effect by using the prototype test, the large-scale test, the small-scale test and the numerical calculation, wherein the structural effect is at least one of the penetration thickness of the containment, the overall deformation angle of the containment and the local deformation displacement of the containment; The structural effect is determined using the empirical formula, wherein the structural effect includes the containment penetration thickness.

6. The method according to claim 5, characterized in that Under the penetration of hard projectiles, the containment penetration thickness is calculated using the corresponding empirical formula, including: The penetration depth of the hardened projectile is calculated by formula 1, wherein: Among them, X is the penetration depth, M is the mass of the projectile, N is the projectile shape coefficient, V is the impact velocity of the projectile, D is the diameter of the projectile, K is a constant parameter, and f c is the compressive strength of concrete; According to the penetration depth, the containment penetration thickness is determined by Formula 2, wherein: Among them, h p is the containment penetration thickness; The containment penetration thickness is amplified using the amplification factor corresponding to the empirical formula.

7. The method according to claim 5, characterized in that Under the external explosion, the containment penetration thickness is calculated using the corresponding empirical formula, including: The containment penetration thickness is calculated by formula 3, wherein: Among them, h z The initial containment penetration thickness under the explosion, W is the equivalent of trinitrotoluene explosive, C is the weight of the charged shell, and R is the distance between the explosive explosion center and the containment surface; The containment penetration thickness is amplified using the amplification factor corresponding to the empirical formula.

8. The method according to any one of claims 2 to 7, characterized in that: Determining the limit value of the overall deformation angle of the containment shell includes: Conducting performance tests on the structure of the containment to obtain a load-displacement curve; Determining the displacement value corresponding to the load limit value according to the load-displacement curve; Based on the displacement value, the limit value of the overall deformation angle of the containment is determined by formula 4, wherein: Among them, β c is the limit value of the overall deformation angle of the containment, Δ is the displacement value, and L is the length of the component on which the performance test is carried out.

9. The method according to claim 2, characterized in that: Selecting a corresponding bearing capacity limit value for comparison according to the structural effect, and determining the core cooling capacity of the containment vessel when the external beyond-design basis event occurs according to the comparison result, including: When the structural effect determined by the effect analysis method is the containment penetration thickness, selecting the corresponding containment penetration thickness limit value for comparison; If the containment penetration thickness is less than or equal to the containment penetration thickness limit value, determining that the containment still maintains the core cooling capability when the external beyond-design basis event occurs; Alternatively, when the structural effect determined by the effect analysis method is the overall deformation angle of the containment, the corresponding limit value of the overall deformation angle of the containment is selected for comparison; If the overall deformation rotation angle of the containment is less than or equal to the overall deformation rotation angle limit value of the containment, it is determined that the containment still maintains the core cooling capability when the external beyond-design basis event occurs; Alternatively, when the structural effect determined by the effect analysis method is the local deformation displacement of the containment, the corresponding local deformation displacement limit value of the containment is selected for comparison; If the local deformation displacement of the containment shell is less than or equal to the local deformation displacement limit value of the containment shell, it is determined that the containment shell still maintains the core cooling capability when the external beyond-design basis event occurs; Alternatively, when the structural effect determined by the effect analysis method is the containment penetration thickness and the containment overall deformation angle, the corresponding containment penetration thickness limit value and the containment overall deformation angle limit value are selected for comparison; If the penetration thickness of the containment shell is less than or equal to the limit value of the penetration thickness of the containment shell, and the overall deformation angle of the containment shell is less than or equal to the limit value of the overall deformation angle of the containment shell, it is determined that the containment shell still maintains the core cooling capability when the external beyond-design basis event occurs; Alternatively, when the structural effect determined by the effect analysis method is the containment penetration thickness and the containment local deformation displacement, the corresponding containment penetration thickness limit value and the containment local deformation displacement limit value are selected for comparison; If the containment penetration thickness is less than or equal to the containment penetration thickness limit value, and the containment local deformation displacement is less than or equal to the containment local deformation displacement limit value, it is determined that the containment still maintains the core cooling capability when the external beyond-design basis event occurs; Alternatively, when the structural effect determined by the effect analysis method is the overall deformation rotation angle of the containment and the local deformation displacement of the containment, the corresponding limit value of the overall deformation rotation angle of the containment and the limit value of the local deformation displacement of the containment are selected for comparison; If the overall deformation rotation angle of the containment shell is less than or equal to the overall deformation rotation angle limit value of the containment shell, and the local deformation displacement of the containment shell is less than or equal to the local deformation displacement limit value of the containment shell, it is determined that the containment shell still maintains the core cooling capability when the external beyond-design basis event occurs; Alternatively, when the structural effect of the containment under the external beyond-design basis event determined by the effect analysis method is the containment penetration thickness, the containment overall deformation angle and the containment local deformation displacement, the corresponding containment penetration thickness limit value, the containment overall deformation angle limit value and the containment local deformation displacement limit value are selected for comparison; If the containment penetration thickness is less than or equal to the containment penetration thickness limit value, and the containment overall deformation angle is less than or equal to the containment overall deformation angle limit value, and the containment local deformation displacement is less than or equal to the containment local deformation displacement limit value, it is determined that the containment still maintains the core cooling capability when the external beyond design basis event occurs.

10. A device for evaluating the cooling capacity of a containment core, characterized in that: include: An acquisition module, used to acquire the type of the external beyond-design basis event, and determine a corresponding effect analysis method according to the type of the external beyond-design basis event; A determination module, configured to determine the structural effect of the containment under the external beyond-design basis event by using the effect analysis method, wherein the structural effect includes one or more of the penetration thickness of the containment, the overall deformation rotation angle of the containment, and the local deformation displacement of the containment; A comparison module is used to select a corresponding bearing capacity limit value for comparison according to the structural effect, and determine the core cooling capacity of the containment vessel when the external beyond-design basis event occurs according to the comparison result.

11. The device according to claim 10, characterized in that Before selecting the corresponding bearing capacity limit value for comparison according to the structural effect, it also includes: The load-bearing capacity limit of the containment is determined, wherein the load-bearing capacity limit includes the containment penetration thickness limit, the containment overall deformation rotation angle limit, and the containment local deformation displacement limit.

12. The device according to claim 10, characterized in that The types of the external beyond-design basis events include hard missile penetration, aircraft impact, contact explosion and long-distance explosion. The acquisition module is used to: When the type of the external beyond design basis event is hard missile penetration, the effect analysis method used is prototype test, or large-scale test, or numerical calculation, or empirical formula, or a combination thereof; When the type of the external beyond design basis event is aircraft impact, the effect analysis method used is small-scale test, or numerical calculation, or a combination thereof; When the type of the external beyond design basis event is contact explosion, the effect analysis method used is prototype test, or numerical calculation, or empirical formula, or a combination thereof; When the type of the external beyond design basis event is a long-distance explosion, the effect analysis method used is a small-scale test, or numerical calculation, or a combination thereof.

13. The device according to claim 12, characterized in that The magnification factor corresponding to the prototype test is 1.1; The magnification factor corresponding to the large-scale test is 1.2; The magnification factor corresponding to the small-scale test is 1.4; The amplification factor corresponding to the numerical calculation is 1.6; The amplification factor corresponding to the empirical formula is 1.

8.

14. The device according to claim 12, characterized in that The determining module is used to: Determine the structural effect by using the prototype test, the large-scale test, the small-scale test and the numerical calculation, wherein the structural effect is at least one of the penetration thickness of the containment, the overall deformation angle of the containment and the local deformation displacement of the containment; The structural effect is determined using the empirical formula, wherein the structural effect includes the containment penetration thickness.

15. The device according to claim 14, characterized in that Under the penetration of hard projectiles, the containment penetration thickness is calculated using the corresponding empirical formula, including: The penetration depth of the hardened projectile is calculated by formula 1, wherein: Among them, X is the penetration depth, M is the mass of the projectile, N is the projectile shape coefficient, V is the impact velocity of the projectile, D is the diameter of the projectile, K is a constant parameter, and f c is the compressive strength of concrete; According to the penetration depth, the containment penetration thickness is determined by Formula 2, wherein: Among them, h p is the containment penetration thickness; The containment penetration thickness is amplified using the amplification factor corresponding to the empirical formula.

16. The device according to claim 14, characterized in that Under the external explosion, the containment penetration thickness is calculated using the corresponding empirical formula, including: The containment penetration thickness is calculated by formula 3, wherein: Among them, h z The initial containment penetration thickness under the explosion, W is the equivalent of trinitrotoluene explosive, C is the weight of the charged shell, and R is the distance between the explosive explosion center and the containment surface; The containment penetration thickness is amplified using the amplification factor corresponding to the empirical formula.

17. The device according to any one of claims 11 to 16, characterized in that Determining the limit value of the overall deformation angle of the containment shell includes: Conducting performance tests on the structure of the containment to obtain a load-displacement curve; Determining the displacement value corresponding to the load limit value according to the load-displacement curve; Based on the displacement value, the limit value of the overall deformation angle of the containment is determined by formula 4, wherein: Among them, β c is the limit value of the overall deformation angle of the containment, Δ is the displacement value, and L is the length of the component on which the performance test is carried out.

18. The device according to claim 11, characterized in that The comparison module is used for: When the structural effect determined by the effect analysis method is the containment penetration thickness, selecting the corresponding containment penetration thickness limit value for comparison; If the containment penetration thickness is less than or equal to the containment penetration thickness limit value, determining that the containment still maintains the core cooling capability when the external beyond-design basis event occurs; Alternatively, when the structural effect determined by the effect analysis method is the overall deformation angle of the containment, the corresponding limit value of the overall deformation angle of the containment is selected for comparison; If the overall deformation rotation angle of the containment shell is less than or equal to the overall deformation rotation angle limit value of the containment shell, it is determined that the containment shell still maintains the core cooling capability when the external beyond-design basis event occurs; Alternatively, when the structural effect determined by the effect analysis method is the local deformation displacement of the containment, the corresponding local deformation displacement limit value of the containment is selected for comparison; If the local deformation displacement of the containment shell is less than or equal to the local deformation displacement limit value of the containment shell, it is determined that the containment shell still maintains the core cooling capability when the external beyond-design basis event occurs; Alternatively, when the structural effect determined by the effect analysis method is the containment penetration thickness and the containment overall deformation angle, the corresponding containment penetration thickness limit value and the containment overall deformation angle limit value are selected for comparison; If the penetration thickness of the containment shell is less than or equal to the limit value of the penetration thickness of the containment shell, and the overall deformation angle of the containment shell is less than or equal to the limit value of the overall deformation angle of the containment shell, it is determined that the containment shell still maintains the core cooling capability when the external beyond-design basis event occurs; Alternatively, when the structural effect determined by the effect analysis method is the containment penetration thickness and the containment local deformation displacement, the corresponding containment penetration thickness limit value and the containment local deformation displacement limit value are selected for comparison; If the containment penetration thickness is less than or equal to the containment penetration thickness limit value, and the containment local deformation displacement is less than or equal to the containment local deformation displacement limit value, it is determined that the containment still maintains the core cooling capability when the external beyond-design basis event occurs; Alternatively, when the structural effect determined by the effect analysis method is the overall deformation rotation angle of the containment and the local deformation displacement of the containment, the corresponding limit value of the overall deformation rotation angle of the containment and the limit value of the local deformation displacement of the containment are selected for comparison; If the overall deformation rotation angle of the containment shell is less than or equal to the overall deformation rotation angle limit value of the containment shell, and the local deformation displacement of the containment shell is less than or equal to the local deformation displacement limit value of the containment shell, it is determined that the containment shell still maintains the core cooling capability when the external beyond-design basis event occurs; Alternatively, when the structural effects of the containment under the external beyond design basis event determined by the effect analysis method are the containment penetration thickness, the containment overall deformation angle and the containment local deformation displacement, the corresponding containment penetration thickness limit value, the containment overall deformation angle limit value and the containment local deformation displacement limit value are selected for comparison; if the containment penetration thickness is less than or equal to the containment penetration thickness limit value, and the containment overall deformation angle is less than or equal to the containment overall deformation angle limit value, and the containment local deformation displacement is less than or equal to the containment local deformation displacement limit value, it is determined that the containment still maintains the core cooling capability when the external beyond design basis event occurs.

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