Method and device for first loading and initial criticality of pebble bed high temperature gas-cooled reactor

Abstract

The present disclosure proposes a method, device, electronic device and storage medium for the first loading and initial criticality of a pebble bed high temperature gas-cooled reactor. The method comprises: when the first reactor module meets the verification test prerequisites, loading a first loading amount of mixed fuel into the core of the first reactor module, gradually raising all the regulating rods and compensating rods to the upper limit, obtaining a first count rate after the boron counter tube counts are stable, loading a second loading amount of mixed fuel into the core, obtaining a second count rate after the boron counter tube counts are stable after loading, and adjusting the regulating rods and compensating rods so that the first reactor module reaches the initial full loading criticality. Through the present disclosure, it is possible to load the core multiple times and perform appropriate extrapolation when the boron counter tube count rate is stable, thereby ensuring that the obtained reactor critical loading amount is relatively close to the actual amount, and ensuring the test effect of the first loading and initial criticality test of the reactor.

Description

Technical Field

[0001] The present disclosure relates to the technical field of reactor commissioning and operation, and in particular to a method, device, electronic equipment and storage medium for first loading and initial criticality of a pebble bed high temperature gas-cooled reactor. Background Art

[0002] In the related technology, in the demonstration project of the high-temperature gas-cooled reactor nuclear power plant, the loading process of the pebble bed type high-temperature gas-cooled reactor is as follows: before the first loading, a graphite ball cushion layer is first loaded into the core, and when all the control rods and absorber balls are outside the core, a mixed fuel of fuel elements and graphite balls is gradually loaded by the one-third extrapolation method until net stack criticality is achieved, and then all the control rods except the safety rods are dropped, and the mixed fuel is continued to be loaded by the one-third extrapolation method, and finally the core reaches the initial full loading height, and finally all the control rods are inserted horizontally to achieve initial full loading criticality.

[0003] Under this method, at the beginning of loading, as the amount of mixed fuel loading increases, the counting rate of the boron counter tube shows an "increase-decrease-increase" phenomenon. Before the net stack criticality, the counting rate of the boron count is not suitable for extrapolation calculation, which will result in an incorrect net stack critical loading amount, affecting the test results of the first loading and initial criticality test of the reactor. Summary of the Invention

[0004] The present disclosure aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, the purpose of the present disclosure is to propose a method, device, electronic equipment, storage medium and computer program product for the first loading and initial criticality of a pebble bed high-temperature gas-cooled reactor, which can ensure that the obtained critical loading of the reactor is relatively close to the actual amount by loading the core multiple times and performing appropriate extrapolation when the counting rate of the boron counter tube is stable, thereby ensuring the experimental effect of the first loading and initial criticality test of the reactor.

[0006] The first embodiment of the present disclosure proposes a method for the first loading and initial criticality of a pebble bed high-temperature gas-cooled reactor, comprising: loading a first loading amount of mixed fuel into the core of the first reactor module when the first reactor module meets the verification test prerequisites, wherein the first loading amount is one-half of the theoretical net critical fuel loading amount of the stack; gradually lifting all the regulating rods and compensating rods to the upper limit to obtain a first counting rate after the boron counter tube counts are stabilized; loading a second loading amount of mixed fuel into the core, and obtaining a second counting rate after the boron counter tube counts are stabilized after loading, wherein the second loading amount is one-sixth of the theoretical net critical fuel loading amount of the stack; performing critical extrapolation processing based on the first counting rate and the second counting rate to determine a third loading amount, and adding the third loading amount of mixed fuel to the core; performing multiple one-third extrapolation loading processing on the core to make the first reactor module reach the net critical state; adjusting the regulating rods and compensating rods to make the first reactor module reach the initial full loading criticality.

[0007] A method for first loading and initial criticality of a pebble-bed high-temperature gas-cooled reactor proposed in an embodiment of the first aspect of the present disclosure comprises the following steps: loading a first loading amount of mixed fuel into the core of the first reactor module when the first reactor module meets the verification test prerequisites; gradually raising all the regulating rods and compensating rods to the upper limit; obtaining a first count rate after the boron counter tube count stabilizes; loading a second loading amount of mixed fuel into the core; and obtaining a second count rate after the boron counter tube count stabilizes after loading; performing critical extrapolation processing based on the first count rate and the second count rate to determine a third loading amount; and adding the third loading amount of mixed fuel to the core; performing multiple one-third extrapolation loading processing on the core to make the first reactor module reach the net reactor critical state; adjusting the regulating rods and compensating rods to make the first reactor module reach the initial full-load criticality; and ensuring that the obtained reactor critical loading amount is relatively close to the actual value and the test effect of the first loading and initial criticality test of the reactor is guaranteed by performing multiple loading on the core and performing appropriate extrapolation when the boron counter tube count rate is stable.

[0008] The second embodiment of the present disclosure proposes a first loading and initial criticality device for a pebble bed high-temperature gas-cooled reactor, comprising: a first processing module, for loading a first loading amount of mixed fuel into the core of the first reactor module when the first reactor module meets the verification test prerequisites, wherein the first loading amount is one-half of the theoretical net critical fuel loading amount of the reactor; a first acquisition module, for gradually raising all the regulating rods and compensating rods to the upper limit, and obtaining a first counting rate after the boron counter tube counts are stabilized; a second acquisition module, for loading a second loading amount of mixed fuel into the core, and obtaining a second counting rate after the boron counter tube counts are stabilized after loading, wherein the second loading amount is one-sixth of the theoretical net critical fuel loading amount of the reactor; a determination module, for performing criticality extrapolation processing based on the first counting rate and the second counting rate, determining a third loading amount, and adding the third loading amount of mixed fuel to the core; a second processing module, for performing multiple one-third extrapolation loading processing on the core so that the first reactor module reaches the net critical state; and an adjustment module, for adjusting the regulating rods and compensating rods so that the first reactor module reaches the initial full-load criticality.

[0009] The first loading and initial criticality device of a pebble-bed high-temperature gas-cooled reactor proposed in an embodiment of the second aspect of the present disclosure comprises the following steps: loading a first loading amount of mixed fuel into the core of the first reactor module when the first reactor module meets the verification test prerequisites; gradually raising all the regulating rods and compensating rods to the upper limit; obtaining a first count rate after the boron counter tube count stabilizes; loading a second loading amount of mixed fuel into the core; and obtaining a second count rate after the boron counter tube count stabilizes after loading; performing critical extrapolation processing based on the first count rate and the second count rate to determine a third loading amount; and adding the third loading amount of mixed fuel to the core; performing multiple one-third extrapolation loading processing on the core to make the first reactor module reach the net reactor critical state; adjusting the regulating rods and compensating rods to make the first reactor module reach the initial full-load criticality; and ensuring that the obtained reactor critical loading amount is close to the actual value and the test effect of the first loading and initial criticality test of the reactor is guaranteed by performing multiple loading on the core and performing appropriate extrapolation when the boron counter tube count rate is stable.

[0010] The third embodiment of the present disclosure proposes an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, the method for first loading and initial criticality of a pebble bed high temperature gas-cooled reactor proposed in the first embodiment of the present disclosure is implemented.

[0011] The fourth embodiment of the present disclosure proposes a non-temporary computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, it implements the first loading and initial criticality method of the pebble bed high-temperature gas-cooled reactor proposed in the first embodiment of the present disclosure.

[0012] The fifth embodiment of the present disclosure proposes a computer program product. When the instructions in the computer program product are executed by a processor, the first loading and initial criticality method of the pebble bed high temperature gas-cooled reactor proposed in the first embodiment of the present disclosure is executed.

[0013] Additional aspects and advantages of the present disclosure will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The above and / or additional aspects and advantages of the present disclosure will become apparent and readily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0015] Figure 1 This is a flow chart of the first loading and initial criticality method of a pebble bed high temperature gas-cooled reactor proposed in one embodiment of the present disclosure;

[0016] Figure 2 This is a flow chart of the first loading and initial criticality of the first reactor module in the embodiment of the present disclosure;

[0017] Figure 3 This is a flow chart of a method for first loading and initial criticality of a pebble bed high temperature gas-cooled reactor according to another embodiment of the present disclosure;

[0018] Figure 4 This is a flow chart of a method for first loading and initial criticality of a pebble bed high temperature gas-cooled reactor according to another embodiment of the present disclosure;

[0019] Figure 5 is the first loading and initial criticality flow chart of the remaining reactor modules in the embodiment of the present disclosure;

[0020] Figure 6 This is a schematic structural diagram of the first loading and initial criticality device of a pebble bed high temperature gas-cooled reactor proposed in one embodiment of the present disclosure;

[0021] Figure 7 This is a schematic structural diagram of the first loading and initial criticality device of a pebble bed high temperature gas-cooled reactor proposed in another embodiment of the present disclosure;

[0022] Figure 8 A block diagram of an exemplary electronic device suitable for implementing embodiments of the present disclosure is shown. DETAILED DESCRIPTION

[0023] The following describes in detail embodiments of the present disclosure, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present disclosure and are not to be construed as limiting the present disclosure. On the contrary, the embodiments of the present disclosure include all variations, modifications, and equivalents that fall within the spirit and scope of the appended claims.

[0024] Figure 1 It is a flow chart of the first loading and initial criticality method of a pebble bed high temperature gas-cooled reactor proposed in one embodiment of the present disclosure.

[0025] It should be noted that the executor of the first loading and initial criticality method of the pebble bed type high temperature gas-cooled reactor in this embodiment is the first loading and initial criticality device of the pebble bed type high temperature gas-cooled reactor, which can be implemented by software and / or hardware. The device can be configured in an electronic device, and there is no restriction on this.

[0026] like Figure 1 As shown, the first loading and initial criticality method of the pebble bed high temperature gas-cooled reactor includes:

[0027] S101: When the first reactor module meets the verification test prerequisites, a first loading amount of mixed fuel is loaded into the core of the first reactor module, wherein the first loading amount is half of the theoretical net critical fuel loading amount.

[0028] Among them, the first reactor module refers to the reactor module selected from multiple exactly the same reactor modules in the power plant to undergo the first loading and initial criticality test first. The first loading and initial criticality test of the first reactor module and the remaining modules of the power plant can be treated differently.

[0029] Among them, mixed fuel balls refer to fuel obtained by mixing fuel elements and graphite balls in a quantitative ratio of 7:8.

[0030] Among them, verification test prerequisites refer to the test conditions that need to be met when the first reactor module is loaded for the first time and the initial critical test is carried out. The verification test prerequisites may include: the core has been loaded with the specified pure graphite ball cushion layer, all safety rods are at the upper limit position, all adjustment rods and compensation rods are at the lower limit position, and all absorption balls are blown out of the core, etc.

[0031] The first loading amount is one-half of the theoretical net critical fuel loading amount.

[0032] In the disclosed embodiment, before the first loading, the initial state of the system is: normal pressure, air atmosphere, core temperature below a certain temperature value, all safety rods are at the upper limit, all adjustment rods and compensation rods are at the lower limit, all absorption balls are blown out of the core, the physical startup related systems are debugged and work normally, the neutron source and boron counter tubes are installed in place, the counting rate of all boron counter tubes is ≥2cps, a graphite ball cushion of a specified height has been installed at the bottom of the core, and the test related systems are put into operation to ensure that the parameters are set reasonably and work normally.

[0033] In the disclosed embodiment, when the first reactor module meets the prerequisites for the verification test, that is, after the core has been loaded with the required pure graphite ball cushion layer, all safety rods are at the upper limit, all adjustment rods and compensation rods are at the lower limit, and all absorption balls are blown out of the core, a mixed fuel of half the theoretical net critical fuel loading amount can be loaded into the core through the fuel loading and unloading system. In order to grasp the changes in the neutron count rate of the boron counter tube and the source range of the off-core nuclear measurement system during the loading process, records and safety assessments can be performed after each time a certain amount of mixed fuel is loaded during the test. During the recording and assessment process, there is no need to stop loading. For example, records can be made every approximately 3,000 mixed fuels in the early stage of loading and every approximately 1,000 mixed fuels in the later stage.

[0034] Optionally, in some embodiments, the verification test prerequisites include: the core is loaded with a pure graphite ball cushion layer, all safety rods are at the upper limit position, all regulating rods and compensating rods are at the lower limit position, and all absorption balls are blown out of the core, so that the test can be carried out under the verification test prerequisites to ensure that all regulating rods and compensating rods are at the lower limit position, thereby ensuring the critical safety of the first loading.

[0035] S102: gradually lifting all the adjustment rods and compensation rods to the upper limit, and obtaining a first counting rate after the boron counter tube counts are stabilized.

[0036] The first counting rate refers to the technical rate of the boron counter obtained after the control rod is adjusted after the first loading and the boron counter count is stabilized.

[0037] In the embodiment of the present disclosure, when the first reactor module meets the verification test prerequisites as mentioned above, after the first load of mixed fuel is loaded into the core of the first reactor module, all the regulating rods and compensating rods can be gradually withdrawn. Compared with the slow introduction of positive reactivity during loading of the fuel loading and unloading system, a faster reactivity introduction can be utilized to verify whether the boron counter tube is in normal working condition.

[0038] S103: A second loading amount of mixed fuel is loaded into the reactor core, and a second counting rate is obtained after the boron counter tube counts stabilize after loading, wherein the second loading amount is one-sixth of the theoretical net critical fuel loading amount.

[0039] The second loading amount is one third of the difference between the theoretical net stack critical fuel loading amount and the first loading amount, that is, one sixth of the theoretical net stack critical fuel loading amount.

[0040] In the embodiment of the present disclosure, the first critical extrapolation can be performed based on the first counting rate of the boron counter tube, and one-third of the difference between the minimum value of the theoretical critical fuel loading and the extrapolated critical loading and the current mixed fuel loading is taken as the loading for the next step. That is to say, one-sixth of the theoretical net stack critical fuel loading is determined as the second loading, and the second loading of mixed fuel is loaded into the core. After the counting stabilizes, the counting rate of the boron counter tube is recorded, and the counting rate of the boron counter tube at this time is used as the second counting rate.

[0041] S104: Perform criticality extrapolation processing based on the first count rate and the second count rate to determine a third loading amount, and add the third loading amount of mixed fuel into the core.

[0042] In the embodiment of the present disclosure, after gradually raising all the regulating rods and compensating rods to the upper limit, obtaining the first counting rate after the boron counter tube counting is stable, loading the second loading amount of mixed fuel into the core, and obtaining the second counting rate after the boron counter tube counting is stable after loading, critical extrapolation processing can be performed based on the first counting rate and the second counting rate to determine the third loading amount, and then the third loading amount of mixed fuel can be added to the core.

[0043] In the embodiment of the present disclosure, when performing critical extrapolation processing based on the first counting rate and the second counting rate to determine the third loading amount, critical extrapolation processing can be performed based on the first counting rate and the second counting rate, and one-third of the difference between the minimum value of the extrapolated critical loading amount and the current mixed fuel loading amount is taken as the third loading amount for the next step, and the third loading amount of mixed fuel is added to the core.

[0044] S105: The core is loaded with one-third extrapolated fuel multiple times to enable the first reactor module to reach net criticality.

[0045] In the embodiment of the present disclosure, after the third loading amount of mixed fuel is added to the core as described above, the core can be subjected to multiple one-third extrapolation loading processes, with each fuel loading amount being one-third of the difference between the minimum value of the physical extrapolation of the boron counter tube and the current loading amount of the core, until the effective neutron multiplication factor Keff of the reactor reaches ≥ 0.998. After that, one control rod is inserted and the specified amount of mixed fuel is loaded, net stack criticality is achieved by lifting the rod.

[0046] S106: Adjust the regulating rods and compensating rods so that the first reactor module reaches the initial full load criticality.

[0047] In the embodiment of the present disclosure, after the core is subjected to multiple one-third extrapolation loading processes so that the first reactor module reaches the net critical state, the regulating rods and the compensating rods can be adjusted so that the first reactor module reaches the initial full-load critical state.

[0048] In the embodiment of the present disclosure, when adjusting the regulating rods and compensating rods so that the first reactor module reaches the initial full load criticality, after the net stack criticality, all regulating rods and compensating rods are inserted to the lower limit, and according to the supervision method of counting extrapolation approaching criticality, the loading is gradually extrapolated according to one third of the difference between the theoretical initial full load mixed fuel loading and the core loading after the net stack criticality until the initial full load core height is reached, and then all the regulating rods and compensating rods are symmetrically lifted one by one to enable the first reactor module to achieve the initial full load criticality.

[0049] For example, if Figure 2 As shown, Figure 2 This is the first loading and initial criticality flow chart of the first reactor module in the embodiment of the present disclosure. Before the first loading, the initial state of the system is: normal pressure, air atmosphere, core temperature below a certain temperature value, all safety rods are at the upper limit, all regulating rods and compensating rods are at the lower limit, all absorption balls are blown out of the core, physical startup related systems are debugged and work normally, neutron source and boron counter tube are installed in place, the counting rate of all boron counter tubes is ≥2cps, a graphite ball cushion of a specified height has been placed at the bottom of the core, and a mixed fuel composed of fuel elements and graphite balls in a certain ratio is loaded into the core through the fuel loading and unloading system. Half of the theoretical net critical fuel loading provided by physical calculation is used as the first mixed fuel loading, and all regulating rods and compensating rods are gradually raised to the upper limit. The count rate change of the boron counter tube is observed. Since the reactivity introduced by the rod raising is relatively fast, it can be judged whether the boron counter tube is working normally. The second mixed fuel loading is the theoretical net critical fuel loading. The fuel loading is one-third of the difference between the first loading and the second loading, i.e., one-sixth of the theoretical net critical fuel loading. The third fuel loading is one-third of the difference between the minimum of the physical extrapolated critical loading by the boron counter tube and the theoretical net critical fuel loading and the current loading. The fuel loading for each subsequent time is one-third of the difference between the physical extrapolated minimum value by the boron counter tube and the current core loading, until the reactor Keff reaches ≥ 0.998. Then, one control rod is inserted and, after being loaded with the specified amount of mixed fuel, net criticality is achieved by lifting the rod. After net criticality is achieved, all regulating rods and compensating rods are inserted to the lower limit. Based on the supervision method of counting extrapolation approaching criticality, fuel loading is gradually extrapolated according to one-third of the difference between the theoretical initial full mixed fuel loading and the core loading after net criticality, until the initial full core height is reached. After reaching the initial full core height, all inserted regulating rods and compensating rods are lifted symmetrically one by one to achieve initial full criticality.

[0050] In this embodiment, when the first reactor module meets the prerequisites for the verification test, a first loading amount of mixed fuel is loaded into the core of the first reactor module, all the regulating rods and compensating rods are gradually raised to the upper limit, a first count rate after the boron counter tube count is stable is obtained, a second loading amount of mixed fuel is loaded into the core, and a second count rate after the boron counter tube count is stable after loading is obtained, critical extrapolation processing is performed based on the first count rate and the second count rate, a third loading amount is determined, and the third loading amount of mixed fuel is added to the core, and the core is subjected to multiple one-third extrapolation loading processing to make the first reactor module reach the net reactor critical state, and the regulating rods and compensating rods are adjusted to make the first reactor module reach the initial full loading criticality. By loading the core multiple times and performing appropriate extrapolation when the boron counter tube count rate is stable, it is ensured that the obtained reactor critical loading amount is relatively close to the actual one, and the test effect of the first loading and initial criticality test of the reactor is guaranteed.

[0051] Figure 3 It is a flow chart of the first loading and initial criticality method of a pebble bed high temperature gas-cooled reactor proposed in one embodiment of the present disclosure.

[0052] like Figure 3 As shown, the first loading and initial criticality method of the pebble bed high temperature gas-cooled reactor includes:

[0053] S301: When the first reactor module meets the verification test prerequisites, a first loading amount of mixed fuel is loaded into the core of the first reactor module, wherein the first loading amount is half of the theoretical net critical fuel loading amount.

[0054] S302: gradually lifting all the adjustment rods and compensation rods to the upper limit, and obtaining the first counting rate after the boron counter tube counts are stabilized.

[0055] S303: Loading a second amount of mixed fuel into the reactor core, and obtaining a second count rate after the boron counter tube counts stabilize after loading, wherein the second loading amount is one-sixth of the theoretical net critical fuel loading amount.

[0056] S304: Perform criticality extrapolation processing based on the first count rate and the second count rate to determine a third loading amount, and add the third loading amount of mixed fuel into the core.

[0057] For the description of S301 to S304 , please refer to the above embodiment for details, which will not be repeated here.

[0058] S305: Determine the extrapolated loading amount when performing one-third extrapolated loading processing on the core each time.

[0059] The extrapolated loading capacity refers to the fuel loading capacity when the core is loaded.

[0060] In the embodiment of the present disclosure, when determining the extrapolated loading capacity each time the core is subjected to one-third extrapolated loading processing, the current loading capacity accumulated in the core can be obtained, the minimum loading capacity between the physical extrapolated critical loading capacity of the boron counting light tube and the theoretical net stack critical fuel loading capacity can be determined, and one-third of the difference between the minimum loading capacity and the first current loading capacity can be calculated as the extrapolated loading capacity.

[0061] Optionally, in some embodiments, when determining the extrapolated loading amount each time the core is subjected to one-third extrapolated loading processing, the first current loading amount of the core can be obtained, the minimum loading amount between the physical extrapolated critical loading amount of the boron counter tube and the theoretical net stack critical fuel loading amount can be determined, and one-third of the difference between the minimum loading amount and the first current loading amount can be determined as the extrapolated loading amount.

[0062] In the embodiment of the present disclosure, the boron counter tube count rate and the cumulative loading amount of the mixed fuel after two adjacent loadings can be used to perform one-third criticality extrapolation until the reactor Keff ≥ 0.998, and the minimum extrapolated critical loading amount is calculated to determine the critical or supercritical transition.

[0063] S306: Adding the extrapolated loading amount of mixed fuel to the core multiple times until the effective neutron multiplication factor of the first reactor module reaches the factor threshold.

[0064] In the embodiment of the present disclosure, after determining the extrapolated loading amount each time the core is subjected to one-third extrapolated loading processing, the mixed fuel of the extrapolated loading amount can be added to the core multiple times until the effective neutron multiplication factor of the first reactor module reaches the factor threshold, wherein the factor threshold is 0.998.

[0065] S307: Adjust the control rods and add the extrapolated loading of mixed fuel so that the first reactor module reaches net criticality.

[0066] In the embodiment of the present disclosure, when the control rods are adjusted and the extrapolated loading amount of mixed fuel is added so that the first reactor module reaches the net critical state, a control rod can be inserted below the height of the pebble bed active area (the uppermost part of the pure graphite ball cushion layer) to perform critical protection, and then the minimum extrapolated critical loading amount determined above plus about 400 mixed fuels are loaded at one time, wherein the additional 400 mixed fuels correspond to about 100 pcm of reactivity, so as to ensure the realization of net criticality during the subsequent rod lifting operation, and then the control rod can be gradually lifted and inserted. During the process of raising the rods, pay close attention to the changes in the neutron count rates of the boron counter tube and the source range until net criticality is achieved (the count rate of the boron counter tube increases steadily or a stable doubling cycle appears). Then record the cumulative loading of the mixed fuel, the reactor doubling cycle and the rod position for inserting the control rods. Insert all the regulating rods and compensation rods to the lower limit in turn. After the count stabilizes, record the count rate of the boron counter tube. Then load the mixed fuel that is one-third of the difference between the theoretical initial full fuel loading and the core loading. After the count stabilizes, record the count rate of the boron counter tube.

[0067] S308: Insert all adjustment rods and compensation rods to the lower limit position.

[0068] In the embodiment of the present disclosure, after the control rods are adjusted and the extrapolated loading amount of mixed fuel is added so that the first reactor module reaches a net critical state, all regulating rods and compensating rods can be inserted to the lower limit position.

[0069] S309: Adjust the regulating rods and compensating rods so that the first reactor module reaches the initial full load criticality.

[0070] Optionally, in some embodiments, when adjusting the regulating rods and compensating rods so that the first reactor module reaches the initial full-load critical state, the core fuel loading of the core after reaching the net stack critical state can be determined, and the core loading is gradually extrapolated according to a loading amount of one-third of the difference between the core fuel loading amount and the theoretical net stack critical fuel loading amount, until the first reactor module reaches the initial full-load core height, and all the regulating rods and compensating rods are symmetrically lifted and inserted one by one, so that the first reactor module reaches the initial full-load critical state.

[0071] In the embodiment of the present disclosure, when the regulating rods and compensating rods are adjusted so that the first reactor module reaches the critical value of initial full loading, the counting rate and the cumulative mixed fuel loading are extrapolated to one-third of the critical loading until the core reaches the initial full loading height, and all regulating rods and compensating rods are lifted to the bottom height of the core active area (the uppermost part of the pure graphite ball cushion layer). After the boron counter tube counts are stable, the position of each control rod and the boron counter tube count are recorded, and all regulating rods and compensating rods are lifted horizontally by 200 mm. After the boron counter tube counts are stable, the position of each control rod and the boron counter tube count are recorded. Based on the counting rates and control rod positions of the two boron counter tubes, the critical rod position is extrapolated and calculated. The target rod position for the next rod lifting operation is determined according to the one-third principle. All regulating rods and compensating rods are lifted horizontally to the determined target rod position. After the boron counter tube counts are stable, the position of each control rod and the boron count are recorded. Tube counting, repeat similar operations, and use the counting rate of the boron counter tube and the position of the control rod after two consecutive horizontal lifting of the regulating rod and the compensating rod to perform one-third criticality extrapolation, until the difference between the extrapolated critical rod position and the current average rod position is less than 70mm (this value can be adjusted for different core designs), transition to criticality or supercriticality, and slowly lift the regulating rod and the compensating rod one by one by 70mm. During the rod lifting process, pay close attention to the changes in the neutron counts of the boron counter tube and the source range until the initial full-load criticality is achieved (the counting rate of the boron counter tube increases steadily or a stable doubling cycle appears), record the positions of the regulating rod and the compensating rod and the reactor doubling cycle, then insert a control rod below the height of the graphite ball cushion layer, record the temperature and other parameters required for the test, and insert all the regulating rods and the compensating rods in turn to the lower limit position, restore the state before the test, and perform the first loading and initial criticality of the remaining reactor modules.

[0072] In this embodiment, when the first reactor module meets the prerequisites for the verification test, a first loading amount of mixed fuel is loaded into the core of the first reactor module, all the regulating rods and compensating rods are gradually raised to the upper limit, a first count rate after the boron counter tube count is stable is obtained, a second loading amount of mixed fuel is loaded into the core, and a second count rate after the boron counter tube count is stable after loading is obtained, critical extrapolation processing is performed based on the first count rate and the second count rate, a third loading amount is determined, and the third loading amount of mixed fuel is added to the core, and the core is subjected to multiple one-third extrapolation loading processing to make the first reactor module reach the net reactor critical state, and the regulating rods and compensating rods are adjusted to make the first reactor module reach the initial full loading criticality. By loading the core multiple times and performing appropriate extrapolation when the boron counter tube count rate is stable, it is ensured that the obtained reactor critical loading amount is relatively close to the actual one, and the test effect of the first loading and initial criticality test of the reactor is guaranteed.

[0073] Figure 4 It is a flow chart of the first loading and initial criticality method of a pebble bed high temperature gas-cooled reactor proposed in one embodiment of the present disclosure.

[0074] like Figure 4 As shown, the first loading and initial criticality method of the pebble bed high temperature gas-cooled reactor includes:

[0075] S401: When the first reactor module meets the verification test prerequisites, a first loading amount of mixed fuel is loaded into the core of the first reactor module, wherein the first loading amount is half of the theoretical net critical fuel loading amount.

[0076] S402: gradually lifting all the adjustment rods and compensation rods to the upper limit, and obtaining the first counting rate after the boron counter tube counts stabilize.

[0077] S403: Loading a second amount of mixed fuel into the reactor core, and obtaining a second count rate after the boron counter tube counts stabilize after loading, wherein the second loading amount is one-sixth of the theoretical net critical fuel loading amount.

[0078] S404: Perform criticality extrapolation processing based on the first count rate and the second count rate to determine a third loading amount, and add the third loading amount of mixed fuel into the core.

[0079] S405: The core is loaded with one-third extrapolated fuel multiple times to enable the first reactor module to reach net criticality.

[0080] S406: Adjust the regulating rods and compensating rods so that the first reactor module reaches the initial full load criticality.

[0081] S407: After the first reactor module completes the initial loading and initial criticality, the remaining reactor modules except the first reactor module are loaded with fuel so that the remaining reactor modules reach the initial full loading criticality.

[0082] Optionally, in some embodiments, when the remaining reactor modules except the first reactor module are loaded so that the remaining reactor modules reach the initial full loading criticality, a first loading amount of mixed fuel can be loaded into the core of the remaining reactor modules if the remaining reactor modules meet the verification test prerequisites, all the regulating rods and compensating rods can be gradually lifted to the upper limit, a first counting rate after the boron counter tube count is stable is obtained, a second loading amount of mixed fuel is loaded into the core, and a second counting rate after the boron counter tube count is stable after loading is obtained, a second current loading amount of the core of the remaining reactor modules is obtained, a loading amount of mixed fuel equal to one-third of the difference between the physical extrapolation critical loading amount of the boron counter tube and the second current loading amount is loaded into the core, a loading amount of mixed fuel equal to one-third of the difference between the physical extrapolation minimum value of the boron counter tube and the second current loading amount is added to the core multiple times until the core reaches the initial full loading height, and all the inserted regulating rods and compensating rods are symmetrically lifted one by one so that the remaining reactors reach the initial full loading criticality.

[0083] In the embodiment of the present disclosure, after the first reactor module completes the first loading and initial criticality, the remaining reactor modules except the first reactor module are loaded, so that the remaining reactor modules reach the initial full loading criticality, and the relevant systems of the test are put into operation to ensure that the parameter settings are reasonable and the operation is normal. The test prerequisites are verified, the core has been loaded with the required pure graphite ball cushion layer, all safety rods are at the upper limit, all adjustment rods and compensation rods are at the lower limit, all absorption balls are blown out of the core, etc., the initial parameters such as the core temperature are recorded, and the core is loaded with a mixed fuel of half the theoretical initial full loading amount of fuel. After the counting is stable, the counting rate of the boron counter tube is recorded to grasp the neutron counting of the boron counter tube and the source range of the off-core nuclear measurement system during the loading process. The rate changes can be recorded and safety assessed every time a certain amount of mixed fuel is loaded during the test (there is no need to stop loading, for example, in the early stage of loading, the record is made every 3,000 mixed fuels, and in the later stage, the record is made every 1,000). One-sixth of the theoretical initial full fuel loading amount of mixed fuel is loaded into the core. After the counting is stable, the counting rate of the boron counter tube is recorded. The first loading extrapolation is performed based on the counting rate of the step boron counter tube. One-third of the difference between the minimum value of the extrapolated critical loading amount and the current mixed fuel loading amount is taken as the loading amount for the next step. The determined mixed fuel is loaded. After the counting is stable, the counting rate of the boron counter tube is recorded. The second loading extrapolation is performed based on the counting rate of the boron counter tube. The minimum value of the extrapolated critical loading amount and the current One third of the difference in mixed fuel loading is used as the loading amount for the next step. Similar operations are repeated, and one third of the loading is extrapolated based on the boron counter tube count rate and the cumulative mixed fuel loading after two adjacent loadings until the core reaches the initial full loading height. All regulating rods and compensating rods are lifted to the bottom height of the core active area (the uppermost part of the pure graphite ball cushion layer). After the boron counter tube count is stable, the position of each control rod and the boron counter tube count are recorded. All regulating rods and compensating rods are lifted horizontally by 200 mm. After the boron counter tube count is stable, the position of each control rod and the boron counter tube count are recorded. Based on the boron counter tube count rate and the average control rod position, the extrapolated critical rod position is calculated. According to the one-third principle, the target rod position for the next rod lifting operation is determined, and all regulating rods are lifted horizontally. and compensating rods to the determined target rod position. After the boron counter tube counts are stable, record the rod positions of each control rod and the boron counter tube counts. Repeat similar operations in the steps. According to the one-third principle, perform critical extrapolation based on the counting rate of the boron counter tube and the average rod position after two adjacent lifting of the regulating rods and compensating rods. Until the difference between the extrapolated critical rod position and the current average rod position is less than 70mm (this value can be adjusted for different core designs), transition to criticality or supercriticality, and slowly lift the regulating rods and compensating rods one by one by 70mm. During the rod lifting process, pay close attention to the changes in the neutron counts of the boron counter tube and the source range until the initial full-load criticality is achieved (the boron counter tube count rate steadily increases or a stable doubling cycle appears). Record the rod positions of the regulating rods and compensating rods and the reactor doubling cycle.Then insert a control rod below the height of the graphite ball cushion, record the temperature and other test parameters, and insert all the adjustment rods and compensation rods to the lower limit in sequence to restore the state before the test. For example, Figure 5 As shown, Figure 5 This is the first loading and initial criticality flow chart of the remaining reactor modules in the embodiment of the present disclosure.

[0084] In this embodiment, when the first reactor module meets the prerequisites for the verification test, a first loading amount of mixed fuel is loaded into the core of the first reactor module, all the regulating rods and compensating rods are gradually raised to the upper limit, a first count rate after the boron counter tube count is stable is obtained, a second loading amount of mixed fuel is loaded into the core, and a second count rate after the boron counter tube count is stable after loading is obtained, critical extrapolation processing is performed based on the first count rate and the second count rate, a third loading amount is determined, and the third loading amount of mixed fuel is added to the core, and the core is subjected to multiple one-third extrapolation loading processing to make the first reactor module reach the net reactor critical state, and the regulating rods and compensating rods are adjusted to make the first reactor module reach the initial full loading criticality. By loading the core multiple times and performing appropriate extrapolation when the boron counter tube count rate is stable, it is ensured that the obtained reactor critical loading amount is relatively close to the actual one, and the test effect of the first loading and initial criticality test of the reactor is guaranteed.

[0085] Figure 6 This is a schematic structural diagram of the first loading and initial criticality device of a pebble bed high temperature gas-cooled reactor proposed in one embodiment of the present disclosure.

[0086] like Figure 6 As shown, the first loading and initial criticality device 60 of the pebble bed high temperature gas-cooled reactor includes:

[0087] The first processing module 601 is configured to load a first amount of mixed fuel into the core of the first reactor module if the first reactor module meets the verification test prerequisites, wherein the first amount of mixed fuel is half of the theoretical net critical fuel loading;

[0088] The first acquisition module 602 is used to gradually raise all the adjustment rods and compensation rods to the upper limit position to obtain a first counting rate after the boron counter tube counts are stabilized;

[0089] A second acquisition module 603 is configured to load a second amount of mixed fuel into the reactor core and acquire a second count rate after the boron counter tube counts stabilize after loading, wherein the second loading amount is one-sixth of the theoretical net critical fuel loading amount;

[0090] A determination module 604 is configured to perform criticality extrapolation processing based on the first count rate and the second count rate, determine a third loading amount, and add the third loading amount of mixed fuel to the core;

[0091] The second processing module 605 is used to perform multiple one-third extrapolation loading processes on the core to make the first reactor module reach a net critical state;

[0092] The adjustment module 606 is used to adjust the regulating rods and the compensating rods so that the first reactor module reaches the initial full-load criticality.

[0093] In some embodiments of the present disclosure, the second processing module 605 is specifically configured to:

[0094] Determine the extrapolated loading amount for each one-third extrapolation of the core;

[0095] Adding the extrapolated amount of mixed fuel to the core multiple times until the effective neutron multiplication factor of the first reactor module reaches a factor threshold;

[0096] Control rod adjustments and the addition of an extrapolated fuel loading allowed the first reactor module to reach net criticality.

[0097] In some embodiments of the present disclosure, the second processing module 605 is further configured to:

[0098] Get a first current loading of the core;

[0099] Determine the minimum value of the boron counter tube physical extrapolation critical loading and the theoretical net reactor critical fuel loading;

[0100] One third of the difference between the minimum load value and the first current load value is determined as the extrapolated load value.

[0101] In some embodiments of the present disclosure, the second processing module 605 is further configured to:

[0102] After adjusting the control rods and adding the extrapolated loading amount of mixed fuel so that the first reactor module reaches the net critical state, all regulating rods and compensating rods are inserted to the lower limit position.

[0103] In some embodiments of the present disclosure, the adjustment module 606 is specifically configured to:

[0104] Determine the core fuel loading after achieving net reactor criticality;

[0105] The core is loaded incrementally with fuel equivalent to one-third of the difference between the core fuel loading and the theoretical net critical fuel loading until the first reactor module reaches the initial fully loaded core height;

[0106] All the regulating rods and compensating rods were inserted symmetrically one by one, so that the first reactor module reached the initial full load criticality.

[0107] In some embodiments of the present disclosure, Figure 7 As shown, Figure 7 This is a schematic structural diagram of the first loading and initial criticality device of a pebble bed high temperature gas-cooled reactor according to another embodiment of the present disclosure, and further includes:

[0108] The third processing module 607 is used to perform loading processing on the remaining reactor modules except the first reactor module after the first reactor module completes the first loading and initial criticality, so that the remaining reactor modules reach the initial full loading criticality.

[0109] In some embodiments of the present disclosure, the third processing module 607 is specifically configured to:

[0110] If the remaining reactor modules meet the verification test prerequisites, loading the cores of the remaining reactor modules with a first load of mixed fuel;

[0111] Gradually lift all the adjustment rods and compensation rods to the upper limit to obtain the first counting rate after the boron counter tube counts stabilize;

[0112] loading a second amount of mixed fuel into the reactor core, and obtaining a second count rate after the boron counter tube counts stabilize after loading;

[0113] obtaining a second current loading of the cores of the remaining reactor modules;

[0114] A mixed fuel having a loading amount equal to one third of the difference between the critical loading amount extrapolated by a boron counter tube and the second current loading amount is loaded into the reactor core;

[0115] adding a mixed fuel in an amount equal to one third of the difference between the minimum value physically extrapolated by the boron counter tube and the second current loading amount into the reactor core multiple times until the reactor core reaches an initial full loading height;

[0116] All regulating rods and compensating rods are inserted one by one symmetrically and horizontally, so that the remaining reactors reach the initial full load criticality.

[0117] In some embodiments of the present disclosure, the verification test prerequisites include: the core is loaded with a pure graphite ball cushion layer, all safety rods are at the upper limit position, all regulating rods and compensating rods are at the lower limit position, and all absorption balls are blown out of the core.

[0118] With the above Figures 1 to 5 The first charging and initial criticality method of the pebble bed type high temperature gas-cooled reactor provided in the embodiment corresponds to the method. The present disclosure also provides a first charging and initial criticality device for the pebble bed type high temperature gas-cooled reactor. Since the first charging and initial criticality device for the pebble bed type high temperature gas-cooled reactor provided in the embodiment of the present disclosure is similar to the above method, Figures 1 to 5The embodiment provided corresponds to the method for the first loading and initial criticality of the pebble bed type high temperature gas-cooled reactor. Therefore, the implementation method of the method for the first loading and initial criticality of the pebble bed type high temperature gas-cooled reactor is also applicable to the first loading and initial criticality device of the pebble bed type high temperature gas-cooled reactor provided in the embodiment of the present disclosure, and will not be described in detail in the embodiment of the present disclosure.

[0119] In this embodiment, when the first reactor module meets the prerequisites for the verification test, a first loading amount of mixed fuel is loaded into the core of the first reactor module, all the regulating rods and compensating rods are gradually raised to the upper limit, a first count rate after the boron counter tube count is stable is obtained, a second loading amount of mixed fuel is loaded into the core, and a second count rate after the boron counter tube count is stable after loading is obtained, critical extrapolation processing is performed based on the first count rate and the second count rate, a third loading amount is determined, and the third loading amount of mixed fuel is added to the core, and the core is subjected to multiple one-third extrapolation loading processing to make the first reactor module reach the net reactor critical state, and the regulating rods and compensating rods are adjusted to make the first reactor module reach the initial full loading criticality. By loading the core multiple times and performing appropriate extrapolation when the boron counter tube count rate is stable, it is ensured that the obtained reactor critical loading amount is relatively close to the actual one, and the test effect of the first loading and initial criticality test of the reactor is guaranteed.

[0120] In order to implement the above embodiments, the present disclosure also proposes a non-temporary computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, it implements the first loading and initial criticality method of the pebble bed high-temperature gas-cooled reactor proposed in the above embodiments of the present disclosure.

[0121] In order to implement the above embodiments, the present disclosure also proposes a computer program product. When the instruction processor in the computer program product executes, the first loading and initial criticality method of the pebble bed high temperature gas-cooled reactor proposed in the above embodiments of the present disclosure is executed.

[0122] Figure 8 A block diagram of an exemplary electronic device suitable for implementing embodiments of the present disclosure is shown.

[0123] Figure 8 The computer device 12 shown is only an example and should not bring any limitation to the functionality and scope of use of the embodiments of the present disclosure.

[0124] like Figure 8 As shown, computer device 12 is implemented as a general-purpose computing device. Components of computer device 12 may include, but are not limited to, one or more processors or processing units 16, system memory 28, and a bus 18 that connects various system components (including system memory 28 and processing unit 16).

[0125] Bus 18 represents one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, a processor, or a local bus using any of a variety of bus architectures. Examples of such architectures include, but are not limited to, the Industry Standard Architecture (ISA) bus, the Micro Channel Architecture (MAC) bus, the Enhanced ISA bus, the Video Electronics Standards Association (VESA) local bus, and the Peripheral Component Interconnection (PCI) bus.

[0126] The computer device 12 typically includes a variety of computer system readable media. These media can be any available media that can be accessed by the computer device 12, including volatile and non-volatile media, removable and non-removable media.

[0127] The memory 28 may include computer system readable media in the form of volatile memory, such as random access memory (RAM) 30 and / or cache memory 32. The computer device 12 may further include other removable / non-removable, volatile / non-volatile computer system storage media. By way of example only, the storage system 34 may be configured to read and write non-removable, non-volatile magnetic media ( Figure 8 Not shown, often called a "hard drive").

[0128] although Figure 8 Although not shown, a disk drive for reading and writing to a removable non-volatile disk (e.g., a "floppy disk"), and an optical disk drive for reading and writing to a removable non-volatile optical disk (e.g., a Compact Disc Read Only Memory (hereinafter referred to as: CD-ROM), a Digital Video Disc Read Only Memory (hereinafter referred to as: DVD-ROM), or other optical media) may be provided. In these cases, each drive may be connected to the bus 18 via one or more data medium interfaces. The memory 28 may include at least one program product having a set (e.g., at least one) of program modules configured to perform the functions of the various embodiments of the present disclosure.

[0129] A program / utility 40 having a set (at least one) of program modules 42 may be stored, for example, in memory 28. Such program modules 42 include, but are not limited to, an operating system, one or more application programs, other program modules, and program data, each of which, or some combination thereof, may include an implementation of a network environment. Program modules 42 generally implement the functions and / or methods of the embodiments described herein.

[0130] The computer device 12 can also communicate with one or more external devices 14 (e.g., a keyboard, pointing device, display 24, etc.), one or more devices that enable human interaction with the computer device 12, and / or any device that enables the computer device 12 to communicate with one or more other computing devices (e.g., a network card, a modem, etc.). This communication can occur via an input / output (I / O) interface 22. Furthermore, the computer device 12 can communicate with one or more networks (e.g., a local area network (LAN), a wide area network (WAN), and / or a public network such as the Internet) via a network adapter 20. As shown, the network adapter 20 communicates with the other modules of the computer device 12 via a bus 18. It should be understood that, although not shown, other hardware and / or software modules can be used in conjunction with the computer device 12, including but not limited to microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0131] The processing unit 16 executes various functional applications and parameter information determinations by running programs stored in the system memory 28, such as implementing the first loading and initial criticality method of the pebble bed high temperature gas-cooled reactor mentioned in the above embodiment.

[0132] It should be noted that, in the description of this disclosure, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance. In addition, in the description of this disclosure, unless otherwise specified, the meaning of "plurality" is two or more.

[0133] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present disclosure includes additional implementations in which functions may be performed out of the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present disclosure belong.

[0134] It should be understood that various parts of the present disclosure can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented using hardware, as in another embodiment, any one of the following technologies known in the art or a combination thereof can be used to implement: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application-specific integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0135] Those skilled in the art will understand that all or part of the steps in the method of the above embodiment can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium. When the program is executed, it includes one or a combination of the steps of the method embodiment.

[0136] In addition, the functional units in the various embodiments of the present disclosure may be integrated into a single processing module, or each unit may exist physically separately, or two or more units may be integrated into a single module. The aforementioned integrated modules may be implemented in the form of hardware or in the form of software functional modules. If the integrated modules are implemented in the form of software functional modules and sold or used as independent products, they may also be stored in a computer-readable storage medium.

[0137] The storage medium mentioned above can be a read-only memory, a magnetic disk or an optical disk, etc.

[0138] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0139] Although the embodiments of the present disclosure have been shown and described above, it is understood that the above embodiments are illustrative and are not to be construed as limitations on the present disclosure. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present disclosure.

Claims

1. A method for first loading and initial criticality of a pebble bed high temperature gas-cooled reactor, characterized in that: include: When the first reactor module meets the verification test prerequisites, loading a first loading amount of mixed fuel into the core of the first reactor module, wherein the first loading amount is one-half of the theoretical net critical fuel loading amount; Gradually lift all the adjustment rods and compensation rods to the upper limit to obtain the first counting rate after the boron counter tube counts stabilize; loading a second loading amount of the mixed fuel into the reactor core, and obtaining a second count rate after the boron counter tube counts stabilize after loading, wherein the second loading amount is one-sixth of the theoretical net critical fuel loading amount; performing critical extrapolation processing based on the first count rate and the second count rate to determine a third loading amount, and adding the mixed fuel of the third loading amount to the core, wherein one third of the difference between the minimum value of the extrapolated critical loading amount and the current mixed fuel loading amount is taken as the third loading amount; performing multiple one-third extrapolation fueling processes on the core to enable the first reactor module to reach a net critical state; Adjusting the regulating rods and the compensating rods so that the first reactor module reaches the initial fully loaded critical state includes: determining the core fuel loading of the core after reaching the net stack critical state; gradually extrapolating the core loading according to a loading amount that is one-third of the difference between the core fuel loading and the theoretical net stack critical fuel loading amount, until the first reactor module reaches the initial fully loaded core height; and symmetrically lifting and inserting all the regulating rods and the compensating rods one by one, so that the first reactor module reaches the initial fully loaded critical state.

2. The method according to claim 1, wherein The step of performing multiple one-third extrapolation loading processes on the core to enable the first reactor module to reach a net critical state includes: determining an extrapolated loading amount when performing the one-third extrapolated fuel loading process on the core each time; adding the extrapolated loading amount of the mixed fuel to the core multiple times until the effective neutron multiplication factor of the first reactor module reaches a factor threshold; Control rods are adjusted and the extrapolated loading of the mixed fuel is added so that the first reactor module reaches the net critical state.

3. The method according to claim 2, wherein Determining the extrapolated loading amount when performing the one-third extrapolated loading process on the core each time includes: obtaining a first current loading amount of the core; determining a minimum value of the boron counter tube physical extrapolated critical loading and the theoretical net stack critical fuel loading; One third of the difference between the minimum load value and the first current load value is determined as the extrapolated load value.

4. The method according to claim 2, wherein After adjusting the control rods and adding the extrapolated loading amount of the mixed fuel so that the first reactor module reaches the net critical state, the method further includes: Insert all the adjusting rods and the compensating rods to the lower limit position.

5. The method according to claim 1, wherein Also includes: After the first reactor module completes the first loading and initial criticality, the remaining reactor modules except the first reactor module are loaded so that the remaining reactor modules reach the initial full loading criticality.

6. The method according to claim 5, wherein The step of loading the remaining reactor modules except the first reactor module so that the remaining reactor modules reach the initial full loading criticality includes: If the remaining reactor modules meet verification test prerequisites, loading the first loading amount of the mixed fuel into the cores of the remaining reactor modules; gradually lifting all the adjustment rods and the compensation rods to the upper limit position, and obtaining the first counting rate after the boron counter tube counts stably; loading the second loading amount of the mixed fuel into the reactor core, and obtaining the second counting rate after the boron counter tube counts stabilize after the loading; obtaining a second current loading of the cores of the remaining reactor modules; The mixed fuel in an amount equal to one third of the difference between the critical loading amount extrapolated by a boron counter tube and the second current loading amount is loaded into the reactor core; adding the mixed fuel in an amount equal to one third of the difference between the minimum value physically extrapolated by the boron counter tube and the second current loading amount into the core multiple times until the core reaches the initial full loading height; All the regulating rods and compensating rods are symmetrically lifted and inserted one by one, so that the remaining reactors reach the initial full-load criticality.

7. The method according to claim 1 or claim 6, wherein: The verification test prerequisites include: the core is loaded with a pure graphite ball cushion layer, all safety rods are at the upper limit position, all regulating rods and compensating rods are at the lower limit position, and all absorption balls are blown out of the core.

8. A pebble bed high temperature gas-cooled reactor initial loading and initial criticality device, characterized in that: include: a first processing module configured to load a first loading amount of mixed fuel into a core of the first reactor module if the first reactor module meets the verification test prerequisites, wherein the first loading amount is one-half of the theoretical net critical fuel loading amount; A first acquisition module is used to gradually raise all the adjustment rods and compensation rods to the upper limit position to obtain a first counting rate after the boron counter tube counts stabilize; a second acquisition module, configured to load a second loading amount of the mixed fuel into the reactor core and acquire a second count rate after the boron counter tube counts stabilize after loading, wherein the second loading amount is one-sixth of the theoretical net critical fuel loading amount; a determination module, configured to perform critical extrapolation processing based on the first count rate and the second count rate to determine a third loading amount, and add the mixed fuel of the third loading amount to the core, wherein the third loading amount is one-third of the difference between the minimum value of the extrapolated critical loading amount and the current mixed fuel loading amount; a second processing module, configured to perform multiple one-third extrapolation loading processes on the core, so that the first reactor module reaches a net critical state; An adjustment module is used to adjust the regulating rods and the compensating rods so that the first reactor module reaches the initial full-load critical state, including: determining the core fuel loading of the core after reaching the net stack critical state; gradually extrapolating the core loading according to a loading amount that is one-third of the difference between the core fuel loading amount and the theoretical net stack critical fuel loading amount, until the first reactor module reaches the initial full-load core height; and symmetrically lifting all the regulating rods and the compensating rods inserted one by one, so that the first reactor module reaches the initial full-load critical state.

9. An electronic device, characterized in that: include: at least one processor; as well as a memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the method according to any one of claims 1 to 7.

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