177-core pressurized water reactor control rod bundle grouping arrangement method and 177-core pressurized water reactor control rod in-bundle arrangement method

Abstract

Disclosed are a 177-core pressurized water reactor control rod bundle grouping arrangement method and a 177-core pressurized water reactor control rod in-bundle arrangement method. The control rod in-bundle arrangement method comprises respectively arranging four strong absorber rods at the position of coordinates (4, 4) in a grid array and positions of rotating same 90°, 180° and 270° around a gauge pipe grid cell. The control rod bundle grouping arrangement method comprises arranging control rod bundles which are divided into T rod groups, S rod groups and AO rod groups in a reactor core of 177 fuel assemblies. While the safety of reactor cores is ensured, the capability of adjusting and controlling control rods can be enhanced, so as to satisfy the control requirements for various load changes. Given a specified quantitative ratio of strong absorbers to weak absorbers, a stronger control capability and less disturbance to local power distribution are allowed.

Description

A method for grouping and arranging control rod bundles within a 177-core pressurized water reactor. Technical Field

[0001] This application belongs to the field of control rod arrangement technology, and particularly relates to a grouping arrangement of control rod bundles and its internal arrangement method for a 177-core pressurized water reactor. Background Technology

[0002] Mode-C operation and control is a pressurized water reactor operation and control mode independently developed in my country. When using this mode, the reactor has strong load tracking capability, allowing the core to rapidly reduce or increase the reactor power level according to changes in grid load. The reactor can perform daily load tracking with a power variation pattern of 14-2-6-2 (typical example value) within 90% of the cycle length. That is, after 14 hours of full-power operation, the reactor power linearly changes to 50% FP within 2 hours, operates at 50% FP for 6 hours, and then linearly increases to full-power level again within 2 hours, adapting to the requirements of daily grid load changes.

[0003] Currently, nuclear power plant reactors in Mode-C operation and control mode maintain normal operation through the following technical means:

[0004] (1) During base load operation and other operations that do not require frequent adjustment of reactor power, only the AO rod group is inserted into the core to control the average temperature of the core coolant, and the axial power deviation is controlled by the operator through manual operation.

[0005] (2) During load tracking operation and other operations that require frequent adjustment of reactor power, both the T rod group and the AO rod group are inserted into the reactor core. The T rod group compensates for reactivity changes caused by power feedback and transient xenon effects by controlling the average temperature of the reactor core coolant, while the AO rod group only controls the axial power deviation.

[0006] (3) Use soluble boron to compensate for the long-term fuel and combustible poison burn-off effects and control the ash bar group within the desired operating range.

[0007] In all the above scenarios, reactor control relies heavily on control rods to rapidly adjust core reactivity. This places high demands on the arrangement of the control rods, as follows:

[0008] Requirement 1: The total control value of the control rod assembly should be large enough to meet the requirements for responsive control capabilities that can quickly adjust to large-range power changes;

[0009] Requirement 2: The disturbance to the core power distribution caused by the control rod assembly during the insertion and removal of the core should be minimized to ensure the core safety margin.

[0010] For requirement 1, the number of control rod bundles that can be arranged in the reactor core is limited due to the hardware structure. The optimal design needs to be made between the limited quantity and the maximum value.

[0011] For requirement 2, the value of single control rod bundles and single control rod groups needs to be limited to avoid large local power distortion amplitudes. Simultaneously, for control rod movement with a certain stroke, the design should minimize the impact on power distribution during the movement.

[0012] It is evident that the arrangement of core control rods is a process of seeking optimization and balance between requirements and constraints. Summary of the Invention

[0013] The purpose of this application is to provide a control rod bundle grouping arrangement and its internal arrangement method for a 177-core pressurized water reactor, which enhances the adjustment and control capability of the control rods and meets the control requirements of various load changes while ensuring core safety.

[0014] To achieve the above objectives, this application provides the following technical solution:

[0015] In one aspect, this application provides a method for arranging control rods within a 177-core pressurized water reactor. An instrumentation tube grid element is arranged at the center of a 17*17 grid array, and four strong absorber rods are respectively arranged at coordinates (4, 4) within the grid array and at positions rotated 90°, 180°, and 270° around the instrumentation tube grid element.

[0016] In some embodiments, 12 weak absorber rods are respectively arranged at coordinates (6, 3), (9, 3), (12, 3) within the grid array and at positions rotated 90°, 180°, and 270° around the instrument tube grid element; 8 weak absorber rods are respectively arranged at coordinates (6, 6), (9, 6) within the grid array and at positions rotated 90°, 180°, and 270° around the instrument tube grid element.

[0017] In some embodiments, four strong absorber rods are respectively arranged at coordinates (6, 6) within the grid array and at positions 90°, 180°, and 270° rotated around the instrument tube grid element.

[0018] In some embodiments, 12 weak absorber rods are respectively arranged at coordinates (6, 3), (9, 3), (12, 3) within the grid array and at positions rotated 90°, 180°, and 270° around the instrument tube grid element; 4 weak absorber rods are respectively arranged at coordinates (9, 6) within the grid array and at positions rotated 90°, 180°, and 270° around the instrument tube grid element.

[0019] In some embodiments, 12 strong absorber rods are respectively arranged at coordinates (6, 3), (9, 3), (12, 3) within the grid array and at positions rotated 90°, 180°, and 270° around the instrument tube grid element; 4 strong absorber rods are respectively arranged at coordinates (9, 6) within the grid array and at positions rotated 90°, 180°, and 270° around the instrument tube grid element.

[0020] Secondly, this application provides a method for grouping and arranging control rod bundles in a 177-core pressurized water reactor. The control rod bundles are arranged in T-bar groups, S-bar groups, and AO-bar groups within the 177 fuel assembly core. The T-bar groups are used to control water temperature or power, the S-bar groups are used to provide sufficient negative reactivity during emergency shutdown, and the AO-bar groups are used to control axial power distribution.

[0021] The control rod bundle in the T-bar group is arranged using the control rod bundle arrangement method of the 177 core pressurized water reactor.

[0022] The control rod bundles in the S rod group and the AO rod group are arranged using the control rod bundle arrangement method of the 177 core pressurized water reactor.

[0023] An overlap step is set for the T-bar group.

[0024] In some embodiments, the T-bar group is divided into T1 bar group, T2 bar group, T3 bar group, T4 bar group, TA bar group, and TB bar group; the TA bar group and the TB bar group are arranged in the control bar bundle arrangement method of the 177 core pressurized water reactor described above.

[0025] In some embodiments, the T1 rod group, the T2 rod group, the T3 rod group, and the T4 rod group overlap sequentially by 90 steps (typical value), with the overlap height accounting for 1 / 3 to 1 / 2 of the total stroke.

[0026] In some embodiments, the T-bar group is arranged as follows:

[0027] The four rod bundles of the T1 rod group are respectively arranged in the 6th row and 8th column, the 8th row and 6th column, the 8th row and 10th column, and the 10th row and 8th column of the core.

[0028] The four rod bundles of the T2 rod group are respectively arranged in the 4th row and 4th column, the 4th row and 12th column, the 12th row and 4th column, and the 12th row and 12th column of the core.

[0029] The four rod bundles of the T3 rod group are respectively arranged in the positions of the 2nd row and 8th column, the 8th row and 2nd column, the 8th row and 14th column, and the 14th row and 8th column of the core.

[0030] The four rod bundles of the T4 rod group are respectively arranged in the 6th row and 6th column, the 6th row and 10th column, the 10th row and 6th column, and the 10th row and 10th column of the core.

[0031] The four control rod bundles of the TA rod group are respectively arranged in the 4th row and 8th column, the 8th row and 4th column, the 8th row and 12th column, and the 12th row and 8th column of the core.

[0032] The eight control rod bundles of the TB rod group are respectively arranged in the positions of the 2nd row and 6th column, the 2nd row and 10th column, the 6th row and 2nd column, the 6th row and 14th column, the 10th row and 2nd column, the 10th row and 14th column, the 14th row and 6th column, and the 14th row and 10th column of the core.

[0033] In some embodiments, the S-bar group is divided into SA-bar group, SB-bar group, SC-bar group, and SD-bar group;

[0034] The eight rod bundles of the SA rod group are respectively arranged in the positions of the 5th row and 5th column, the 5th row and 11th column, the 7th row and 7th column, the 7th row and 9th column, the 9th row and 7th column, the 9th row and 9th column, the 11th row and 5th column, and the 11th row and 11th column of the core.

[0035] The eight rod bundles of the SB rod group are respectively arranged in the positions of the 5th row and 7th column, the 5th row and 9th column, the 7th row and 5th column, the 7th row and 11th column, the 9th row and 5th column, the 9th row and 11th column, the 11th row and 7th column, and the 11th row and 9th column of the core.

[0036] The eight rod bundles of the SC rod group are respectively arranged in the positions of the 3rd row and 7th column, the 3rd row and 9th column, the 7th row and 3rd column, the 7th row and 13th column, the 9th row and 3rd column, the 9th row and 13th column, the 13th row and 7th column, and the 13th row and 9th column of the core.

[0037] The eight rod bundles of the SD rod group are respectively arranged in the positions of the 3rd row and 5th column, the 3rd row and 11th column, the 5th row and 3rd column, the 5th row and 13th column, the 11th row and 3rd column, the 11th row and 13th column, the 13th row and 5th column, and the 13th row and 11th column of the core.

[0038] In some embodiments, the nine control rod bundles of the AO rod group are arranged in the positions of the 4th row and 6th column, the 4th row and 10th column, the 6th row and 4th column, the 6th row and 12th column, the 8th row and 8th column, the 10th row and 4th column, the 10th row and 12th column, the 12th row and 6th column, and the 12th row and 10th column of the core.

[0039] In some embodiments, control rod bundles are arranged at 69 locations in the core of 177 fuel assemblies, and each control rod bundle is not arranged adjacent to another.

[0040] Thirdly, this application provides a control rod bundle for a 177-core pressurized water reactor, including four strong absorber rods arranged at coordinates (4, 4) within a 17*17 grid array and at positions 90°, 180°, and 270° rotated around the instrumentation tube grid element.

[0041] In some embodiments, the control rod bundle of the 177-core pressurized water reactor includes 12 weak absorber rods arranged at coordinates (6, 3), (9, 3), (12, 3) within the grid and at positions rotated 90°, 180°, and 270° around the instrumentation tube grid, and 8 weak absorber rods arranged at coordinates (6, 6), (9, 6) within the grid and at positions rotated 90°, 180°, and 270° around the instrumentation tube grid.

[0042] In some embodiments, the control rod bundle of the 177-core pressurized water reactor includes four strong absorber rods arranged at coordinates (6, 6) within the grid and at positions 90°, 180°, and 270° rotated around the instrumentation tube grid.

[0043] In some embodiments, the control rod bundle of the 177-core pressurized water reactor further includes 12 weak absorber rods arranged at coordinates (6, 3), (9, 3), (12, 3) within the grid and at positions rotated 90°, 180°, and 270° around the instrumentation tube grid element, and 4 weak absorber rods arranged at coordinates (9, 6) within the grid and at positions rotated 90°, 180°, and 270° around the instrumentation tube grid element.

[0044] In some embodiments, the control rod bundle of the 177-core pressurized water reactor further includes 12 strong absorber rods arranged at coordinates (6, 3), (9, 3), (12, 3) within the grid and at positions rotated 90°, 180°, and 270° around the instrumentation tube grid element, and 4 strong absorber rods arranged at coordinates (9, 6) within the grid and at positions rotated 90°, 180°, and 270° around the instrumentation tube grid element.

[0045] Fourthly, this application provides a control rod bundle grouping arrangement structure for a 177-core pressurized water reactor, comprising:

[0046] T-bar assembly, used to control water temperature or power, wherein the T-bar assembly contains the control rod bundle of the 177 core pressurized water reactor;

[0047] S-rod bundles are used to provide sufficient negative reactivity during emergency reactor shutdown. The S-rod bundles contain the control rod bundles of the 177-core pressurized water reactor.

[0048] The AO rod assembly is used to control the axial power distribution, and the AO rod assembly contains the control rod bundle of the 177 core pressurized water reactor.

[0049] In some embodiments, the T-bar group includes T1 bar group, T2 bar group, T3 bar group, T4 bar group, TA bar group, and TB bar group.

[0050] In some embodiments, the TA rod group contains the control rod bundle of the 177 core pressurized water reactor, and the TB rod group contains the control rod bundle of the 177 core pressurized water reactor.

[0051] In some embodiments, the T1 rod group, the T2 rod group, the T3 rod group, and the T4 rod group overlap 90 steps in sequence, with the overlap height accounting for 1 / 3 to 1 / 2 of the total stroke.

[0052] In some embodiments, in the control rod bundle grouping arrangement structure of the 177-core pressurized water reactor...

[0053] The T1 rod group includes four control rod bundles corresponding to the 6th row and 8th column, the 8th row and 6th column, the 8th row and 10th column, and the 10th row and 8th column, respectively.

[0054] The T2 rod group includes four control rod bundles corresponding to the 4th row and 4th column, the 4th row and 12th column, the 12th row and 4th column, and the 12th row and 12th column, respectively.

[0055] The T3 rod group includes four control rod bundles corresponding to the 2nd row and 8th column, the 8th row and 2nd column, the 8th row and 14th column, and the 14th row and 8th column, respectively;

[0056] The T4 rod group includes four control rod bundles corresponding to the 6th row and 6th column, the 6th row and 10th column, the 10th row and 6th column, and the 10th row and 10th column, respectively.

[0057] In some embodiments, the TA rod group includes four control rod bundles corresponding to the 4th row and 8th column, the 8th row and 4th column, the 8th row and 12th column, and the 12th row and 8th column, respectively; the TB rod group includes eight control rod bundles corresponding to the 2nd row and 6th column, the 2nd row and 10th column, the 6th row and 2nd column, the 6th row and 14th column, the 10th row and 2nd column, the 10th row and 14th column, the 14th row and 6th column, and the 14th row and 10th column, respectively.

[0058] In some embodiments, the S-bar group includes the SA-bar group, SB-bar group, SC-bar group, and SD-bar group.

[0059] In some embodiments, the SA rod group includes eight control rod bundles corresponding to the 5th row and 5th column, the 5th row and 11th column, the 7th row and 7th column, the 7th row and 9th column, the 9th row and 7th column, the 9th row and 9th column, the 11th row and 5th column, and the 11th row and 11th column, respectively.

[0060] The SB rod group includes eight control rod bundles corresponding to the 5th row and 7th column, the 5th row and 9th column, the 7th row and 5th column, the 7th row and 11th column, the 9th row and 5th column, the 9th row and 11th column, the 11th row and 7th column, and the 11th row and 9th column, respectively.

[0061] The SC rod group includes eight control rod bundles corresponding to the 3rd row and 7th column, the 3rd row and 9th column, the 7th row and 3rd column, the 7th row and 13th column, the 9th row and 3rd column, the 9th row and 13th column, the 13th row and 7th column, and the 13th row and 9th column, respectively.

[0062] The SD rod group includes eight control rod bundles corresponding to the 3rd row and 5th column, the 3rd row and 11th column, the 5th row and 3rd column, the 5th row and 13th column, the 11th row and 3rd column, the 11th row and 13th column, the 13th row and 5th column, and the 13th row and 11th column, respectively.

[0063] In some embodiments, the AO rod group includes nine control rod bundles corresponding to the 4th row and 6th column, the 4th row and 10th column, the 6th row and 4th column, the 6th row and 12th column, the 8th row and 8th column, the 10th row and 4th column, the 10th row and 12th column, the 12th row and 6th column, and the 12th row and 10th column, respectively.

[0064] In some embodiments, the control rod bundle grouping arrangement structure of the 177-core pressurized water reactor includes arranging control rod bundles at 69 locations in the core of the 177 fuel assemblies, with each control rod bundle arranged independently of adjacent sides.

[0065] Compared with the prior art, the control rod bundle grouping arrangement and its intra-bundle arrangement method for the 177-core pressurized water reactor provided in this application have the following advantages:

[0066] The technical solution provided in this application can enhance the adjustment and control capabilities of the control rods while ensuring core safety, and meet the control requirements of various load changes.

[0067] With a specified ratio of strong and weak absorbers, the technical solution provided in this application has strong control capabilities and minimal disturbance to local power distribution.

[0068] The technical solution provided in this application possesses sufficient reactive control capabilities, enabling non-boron load tracking operation within 90% of the cycle life, with a load ramp-up / down rate of 25% FP / h during load tracking; it also achieves simultaneous automatic control of different core parameters (including axial power distribution, water temperature, and power). Furthermore, the disturbance to the core power distribution caused by control rod insertion is less than 8%.

[0069] When using the technical solution provided in this application, a shutdown margin of more than 2100 pcm can be provided throughout the entire core lifespan. Attached Figure Description

[0070] To more clearly illustrate the technical solution of this application, the accompanying drawings used in the technical description will be briefly introduced below.

[0071] Figure 1 is a schematic diagram of the grouping arrangement of the control rod bundles of the 177-core pressurized water reactor provided in this application, and the row and column numbers are shown in the figure.

[0072] Figure 2 is a schematic diagram of the arrangement of the four strong absorber rods in the control rod bundle provided in this application;

[0073] Figure 3 is a schematic diagram of the arrangement of the eight strong absorber rods in the control rod bundle provided in this application;

[0074] Figure 4 is a schematic diagram of the arrangement of 24 strong absorber rods in the control rod bundle provided in this application.

[0075] In the diagram, □ represents a fuel cell and ■ represents a strong absorber rod. Indicates a weak absorber rod. The instrumentation grid element is represented by the upper left corner of Figures 2 to 4, which is the origin of the coordinate system within the grid. The horizontal coordinate is to the right, and the vertical coordinate is downward. All coordinate values ​​are positive numbers. Detailed Implementation

[0076] The following detailed description provides further details on specific implementation methods.

[0077] This application provides Embodiments 1 to 12. For a single control rod bundle, when the number of absorber rods in the bundle is fixed, the design of the number of strong absorber rods and weak absorber rods in the rod bundle assembly is optimized, and the arrangement scheme under the specific number distribution of the two is optimized, thereby forming the arrangement scheme in the control rod bundle in this application.

[0078] This application provides embodiments 13 to 20, which, at the core level, divide the rod bundle combinations and detailed distributions for different control purposes according to various scenarios of the MODE-C operation control mode. Specifically, this application sets up a T-bar temperature regulating rod group to control the water temperature; sets up an AO-bar axial power offset control rod group to control the core axial power distribution; and sets up an S-bar shutdown rod group to provide sufficient negative reactivity during core protection shutdown. Within the T-bar group, according to control needs, it is divided into T1-bar group, T2-bar group, T3-bar group, T4-bar group, TA-bar group, and TB-bar group. Within the S-bar group, it is divided into SA-bar group, SB-bar group, SC-bar group, and SD-bar group as needed. For T-bar groups with a large overall reactivity, overlapping steps are set between each sub-bar group to control the reactivity introduction rate.

[0079] Example 1

[0080] Example 1 provides a method for arranging control rods within a 177-core pressurized water reactor. An instrumentation tube grid is arranged at the center position (9, 9) of the 17*17 grid array. Four strong absorber rods are arranged at the coordinates (4, 4) within the grid array and at positions rotated 90°, 180°, and 270° around the instrumentation tube grid, i.e., 1 / 4 rotationally symmetrical positions.

[0081] Specifically, as shown in Figure 2, a strong absorber rod is arranged at coordinates (4, 4), (14, 4), (4, 14), and (14, 14) within the grid array.

[0082] Furthermore, the 12 weak absorber rods are arranged in the grid array at coordinates (6, 3), (9, 3), and (12, 3), and at positions 90°, 180°, and 270° rotated around the instrument tube grid element, i.e., 1 / 4 rotationally symmetric positions; then, the 8 weak absorber rods are arranged in the grid array at coordinates (6, 6) and (9, 6), and at positions 90°, 180°, and 270° rotated around the instrument tube grid element, i.e., 1 / 4 rotationally symmetric positions.

[0083] Specifically, as shown in Figure 2, a weak absorber rod is arranged at each of the following coordinates within the grid array: (6, 3), (9, 3), (12, 3), (3, 6), (6, 6), (9, 6), (12, 6), (15, 6), (3, 9), (6, 9), (12, 9), (15, 9), (3, 12), (6, 12), (9, 12), (12, 12), (15, 12), (6, 15), (9, 15), and (12, 15).

[0084] Fuel grids are arranged in the remaining positions, as shown in Figure 2.

[0085] An excessive number of strong absorbers leads to excessively high rod costs and severe power distribution distortion during core insertion, which is detrimental to core safety. Conversely, a small number of strong absorbers may result in insufficient control capabilities, failing to effectively control the target parameters. The design in Example 1 (i.e., the arrangement shown in Figure 2) is a feasible technical solution derived from comprehensive consideration and optimization studies.

[0086] Example 2

[0087] Using the control rod bundle arrangement method for a 177-core pressurized water reactor provided in Example 1, Example 2 provides a control rod bundle for a 177-core pressurized water reactor, which includes:

[0088] Four strong absorber rods are arranged at coordinates (4, 4) within the 17*17 grid array of the component and at positions of 90°, 180°, and 270° rotation around the instrument tube grid element (i.e., 1 / 4 rotationally symmetric positions).

[0089] Twelve weak absorber rods are arranged at coordinates (6, 3), (9, 3), and (12, 3) within the grid array, and at positions 90°, 180°, and 270° rotated around the instrument tube grid element (i.e., 1 / 4 rotationally symmetric positions); and

[0090] Eight weak absorber rods are arranged at coordinates (6, 6) and (9, 6) within the grid array and at positions 90°, 180°, and 270° rotated around the instrument tube grid element (i.e., 1 / 4 rotationally symmetric positions).

[0091] The specific coordinates of the strong absorber rods, weak absorber rods, and fuel grid elements of the control rod bundle are described in Example 1 and will not be repeated here.

[0092] Example 3

[0093] Example 3 is based on the technical solution of Example 1 and further improved. Example 3 provides a method for arranging the control rod bundle in a 177-core pressurized water reactor. It only requires replacing the weak absorber rods in coordinates (6, 6), (12, 6), (6, 12), and (12, 12) with strong absorber rods. The arrangement of the remaining weak absorber rods and strong absorber rods is consistent with that in Example 1.

[0094] Example 4

[0095] Using the control rod bundle arrangement method for a 177-core pressurized water reactor provided in Example 3, Example 4 provides a control rod bundle for a 177-core pressurized water reactor, which includes:

[0096] Eight strongly absorbing rods are arranged within a 17*17 grid array at coordinates (4,4), (14,4), (4,14), (14,14), (6,6), (12,6), (6,12), and (12,12); and...

[0097] Sixteen weak absorber rods are arranged within the 17*17 grid of the component at coordinates (6,3), (9,3), (12,3), (3,6), (9,6), (15,6), (3,9), (6,9), (12,9), (15,9), (3,12), (9,12), (15,12), (6,15), (9,15), and (12,15).

[0098] Example 5

[0099] Example 5 provides a method for arranging control rods within a 177-core pressurized water reactor. An instrumentation tube grid element is arranged at the center of a 17*17 grid array. Eight strong absorber rods are arranged at coordinates (4, 4) and (6, 6) within the grid array, and at positions rotated 90°, 180°, and 270° around the instrumentation tube grid element, i.e., 1 / 4 rotationally symmetrical positions.

[0100] Specifically, as shown in Figure 3, a strong absorber rod is arranged at each of the following coordinates within the grid array: (4, 4), (14, 4), (4, 14), (14, 14), (6, 6), (12, 6), (6, 12), and (12, 12).

[0101] Furthermore, the 12 weak absorber rods are arranged in the grid array at coordinates (6, 3), (9, 3), and (12, 3), and at positions 90°, 180°, and 270° rotated around the instrument tube grid element, i.e., 1 / 4 rotationally symmetric positions; then, the 4 weak absorber rods are arranged in the grid array at coordinates (9, 6), and at positions 90°, 180°, and 270° rotated around the instrument tube grid element, i.e., 1 / 4 rotationally symmetric positions.

[0102] Specifically, as shown in Figure 3, a weak absorber rod is arranged at each of the following coordinates within the grid: (6, 3), (9, 3), (12, 3), (3, 6), (9, 6), (15, 6), (3, 9), (6, 9), (12, 9), (15, 9), (3, 12), (9, 12), (15, 12), (6, 15), (9, 15), and (12, 15).

[0103] Fuel grids are arranged in the remaining positions, as shown in Figure 3.

[0104] Example 6

[0105] Using the control rod bundle arrangement method of the 177-core pressurized water reactor provided in Example 5, Example 6 provides a control rod bundle for a 177-core pressurized water reactor. The arrangement of the weak absorber rods and strong absorber rods in this control rod bundle is consistent with that in Example 4 or 5. For specific coordinates, please refer to Example 4 or 5, which will not be repeated here.

[0106] Example 7

[0107] Example 7 provides a method for arranging control rods within a 177-core pressurized water reactor. An instrumentation grid is positioned at the center of a 17*17 array. Twenty-four strong absorber rods are arranged within the array at coordinates (4,4), (6,6), (6,3), (9,3), (12,3), and (6,9), and at positions rotated 90°, 180°, and 270° around the instrumentation grid, i.e., 1 / 4 rotationally symmetrical positions. Weak absorber rods are not arranged.

[0108] Specifically, as shown in Figure 4, a strong absorber rod is arranged at each of the following coordinates within the grid array: (4,4), (14,4), (4,14), (14,14), (6,6), (12,6), (6,12), (12,12), (6,3), (9,3), (12,3), (3,6), (9,6), (15,6), (3,9), (6,9), (12,9), (15,9), (3,12), (9,12), (15,12), (6,15), (9,15), (12,15).

[0109] Fuel grids are placed in the remaining locations, as shown in Figure 4.

[0110] Through the design in Example 7, strong absorbers are arranged throughout to maximize value. The arrangement of the strong absorbers is specifically designed and unique to this application.

[0111] Example 8

[0112] Using the control rod bundle arrangement method of the 177-core pressurized water reactor provided in Example 7, Example 8 provides a control rod bundle for a 177-core pressurized water reactor, as shown in Figure 4. This control rod bundle only includes strong absorber rods, and the arrangement coordinates of the strong absorber rods are as shown in Example 7, which will not be repeated here.

[0113] Example 9

[0114] Example 9 is based on the technical solution of Example 1 and further improves it. Example 9 provides a method for arranging the control rod bundle in a 177-core pressurized water reactor. The weak absorber rods in Example 1 can be replaced with strong absorber rods.

[0115] Example 10

[0116] Using the control rod bundle arrangement method of the 177-core pressurized water reactor provided in Example 9, Example 10 provides a control rod bundle for a 177-core pressurized water reactor. This control rod bundle only includes strong absorber rods. The arrangement coordinates of the strong absorber rods are shown in Example 7, and will not be repeated here.

[0117] Example 11

[0118] Example 11 is based on the technical solution of Example 3 and further improved. Example 11 provides a method for arranging the control rod bundle in a 177-core pressurized water reactor. The weak absorber rods in Example 3 can be replaced with strong absorber rods.

[0119] Example 12

[0120] Using the control rod bundle arrangement method of the 177-core pressurized water reactor provided in Example 11, Example 12 provides a control rod bundle for a 177-core pressurized water reactor. This control rod bundle only includes strong absorber rods. The arrangement coordinates of the strong absorber rods are shown in Example 7, and will not be repeated here.

[0121] Example 13

[0122] Example 13 provides a method for grouping and arranging control rod bundles in a 177-core pressurized water reactor, including:

[0123] In the 177 fuel assemblies of the reactor core, control rod bundles are arranged in T-bar groups, S-bar groups and AO-bar groups. The T-bar groups are used to control water temperature or power, the S-bar groups are used to provide sufficient negative reactivity during emergency shutdown, and the AO-bar groups are used to control axial power distribution.

[0124] The control rod bundles in the T-bar group are arranged in the control rod bundle arrangement method of the 177 core pressurized water reactor as described in Example 1.

[0125] The control rod bundles in the S-rod group and AO-rod group are arranged in the control rod bundle arrangement method of the 177 core pressurized water reactor as described in Example 7, Example 9 or Example 11.

[0126] Set an overlap step for the T-bar group.

[0127] Example 14

[0128] Using the control rod bundle grouping arrangement method for a 177-core pressurized water reactor provided in Example 13, Example 14 provides a control rod bundle grouping arrangement structure for a 177-core pressurized water reactor, including:

[0129] T-bar assembly, used to control water temperature or power, contains control rod bundles as described in Example 2 for a 177 core pressurized water reactor.

[0130] S-rod bundles are used to provide sufficient negative reactivity during emergency shutdown. The S-rod bundles contain control rod bundles for a 177-core pressurized water reactor as described in Examples 7, 9 or 11.

[0131] The AO rod assembly is used to control the axial power distribution. The AO rod assembly contains the control rod bundle of the 177-core pressurized water reactor as described in Embodiment 7, Embodiment 9 or Embodiment 11.

[0132] Example 15

[0133] Example 15 is based on the technical solution of Example 13 and further improved. Example 15 provides a method for grouping and arranging control rod bundles in a 177-core pressurized water reactor, further dividing the T rod group into T1 rod group, T2 rod group, T3 rod group, T4 rod group, TA rod group, and TB rod group.

[0134] The TA rod group and TB rod group are arranged in the control rod bundle arrangement method of the 177 core pressurized water reactor as described in Example 7, Example 9 or Example 11.

[0135] The T1, T2, T3, and T4 bar groups are overlapped sequentially for 90 steps, with the overlap height accounting for 1 / 3 to 1 / 2 of the total stroke.

[0136] Arrange the T-bar groups as follows:

[0137] The four rod bundles of T1 are arranged in the 6th row and 8th column, 8th row and 6th column, 8th row and 10th column, and 10th row and 8th column of the core, respectively.

[0138] The four rod bundles of the T2 rod group are arranged in the 4th row and 4th column, the 4th row and 12th column, the 12th row and 4th column, and the 12th row and 12th column of the core, respectively.

[0139] The four rod bundles of the T3 rod group are arranged in the positions of the 2nd row and 8th column, the 8th row and 2nd column, the 8th row and 14th column, and the 14th row and 8th column of the core, respectively.

[0140] The four rod bundles of the T4 rod group are respectively arranged in the 6th row and 6th column, the 6th row and 10th column, the 10th row and 6th column, and the 10th row and 10th column of the core.

[0141] The four control rod bundles of the TA rod group are arranged in the 4th row and 8th column, the 8th row and 4th column, the 8th row and 12th column, and the 12th row and 8th column of the core, respectively.

[0142] The eight control rod bundles of the TB rod group are arranged in the positions of the 2nd row and 6th column, the 2nd row and 10th column, the 6th row and 2nd column, the 6th row and 14th column, the 10th row and 2nd column, the 10th row and 14th column, the 14th row and 6th column, and the 14th row and 10th column of the core, respectively.

[0143] Example 16

[0144] Using the control rod bundle grouping arrangement method for a 177-core pressurized water reactor provided in Example 15, Example 16 provides a control rod bundle grouping arrangement structure for a 177-core pressurized water reactor, as shown in Figure 1, including:

[0145] The T1 bar group includes four control bar bundles corresponding to the 6th row and 8th column, the 8th row and 6th column, the 8th row and 10th column, and the 10th row and 8th column, respectively.

[0146] The T2 bar group includes four control bar bundles corresponding to the 4th row and 4th column, the 4th row and 12th column, the 12th row and 4th column, and the 12th row and 12th column, respectively.

[0147] The T3 bar group includes four control bar bundles corresponding to the 2nd row and 8th column, the 8th row and 2nd column, the 8th row and 14th column, and the 14th row and 8th column, respectively.

[0148] The T4 bar group includes four control bar bundles corresponding to the 6th row and 6th column, the 6th row and 10th column, the 10th row and 6th column, and the 10th row and 10th column, respectively.

[0149] The TA rod group includes four control rod bundles corresponding to the positions of the 4th row and 8th column, the 8th row and 4th column, the 8th row and 12th column, and the 12th row and 8th column, respectively.

[0150] The TB rod assembly consists of eight control rod bundles corresponding to the positions of row 2, column 6; row 2, column 10; row 6, column 2; row 6, column 14; row 10, column 2; row 10, column 14; row 14, column 6; and row 14, column 10.

[0151] Example 17

[0152] Example 17 is based on and further improves upon the technical solutions of Example 13 or Example 15. Example 17 provides a method for grouping and arranging control rod bundles in a 177-core pressurized water reactor, further dividing the S rod group into SA rod group, SB rod group, SC rod group, and SD rod group, as shown in Figure 1. Specifically:

[0153] The eight rod bundles of the SA rod group are arranged in the positions of the 5th row and 5th column, the 5th row and 11th column, the 7th row and 7th column, the 7th row and 9th column, the 9th row and 7th column, the 9th row and 9th column, the 11th row and 5th column, and the 11th row and 11th column of the core, respectively.

[0154] The eight rod bundles of the SB rod group are arranged in the positions of the 5th row and 7th column, the 5th row and 9th column, the 7th row and 5th column, the 7th row and 11th column, the 9th row and 5th column, the 9th row and 11th column, the 11th row and 7th column, and the 11th row and 9th column of the core, respectively.

[0155] The eight rod bundles of the SC rod group are arranged in the positions of the 3rd row and 7th column, the 3rd row and 9th column, the 7th row and 3rd column, the 7th row and 13th column, the 9th row and 3rd column, the 9th row and 13th column, the 13th row and 7th column, and the 13th row and 9th column of the core, respectively.

[0156] The eight rod bundles of the SD rod group are arranged in the positions of the 3rd row and 5th column, the 3rd row and 11th column, the 5th row and 3rd column, the 5th row and 13th column, the 11th row and 3rd column, the 11th row and 13th column, the 13th row and 5th column, and the 13th row and 11th column of the core, respectively.

[0157] Example 18

[0158] Using the control rod bundle grouping arrangement method for the 177-core pressurized water reactor provided in Example 17, Example 18 provides a control rod bundle grouping arrangement structure for the 177-core pressurized water reactor, as shown in Figure 1, including:

[0159] SA rod group includes 8 control rod bundles corresponding to the 5th row and 5th column, the 5th row and 11th column, the 7th row and 7th column, the 7th row and 9th column, the 9th row and 7th column, the 9th row and 9th column, the 11th row and 5th column, and the 11th row and 11th column, respectively;

[0160] The SB bar group includes eight control bar bundles corresponding to the 5th row and 7th column, the 5th row and 9th column, the 7th row and 5th column, the 7th row and 11th column, the 9th row and 5th column, the 9th row and 11th column, the 11th row and 7th column, and the 11th row and 9th column, respectively.

[0161] The SC bar group includes eight control bar bundles corresponding to the 3rd row and 7th column, the 3rd row and 9th column, the 7th row and 3rd column, the 7th row and 13th column, the 9th row and 3rd column, the 9th row and 13th column, the 13th row and 7th column, and the 13th row and 9th column, respectively.

[0162] The SD rod assembly includes eight control rod bundles corresponding to the 3rd row and 5th column, the 3rd row and 11th column, the 5th row and 3rd column, the 5th row and 13th column, the 11th row and 3rd column, the 11th row and 13th column, the 13th row and 5th column, and the 13th row and 11th column, respectively.

[0163] Example 19

[0164] Example 19 is based on and further improves upon the technical solutions of Example 13, Example 15 or Example 17. Example 19 provides a method for grouping and arranging control rod bundles in a 177-core pressurized water reactor. The nine control rod bundles of the AO rod group are further arranged in the positions of the 4th row and 6th column, the 4th row and 10th column, the 6th row and 4th column, the 6th row and 12th column, the 8th row and 8th column, the 10th row and 4th column, the 10th row and 12th column, the 12th row and 6th column, and the 12th row and 10th column of the core.

[0165] Example 20

[0166] Using the control rod bundle grouping arrangement method for the 177-core pressurized water reactor provided in Example 19, Example 20 provides a control rod bundle grouping arrangement structure for the 177-core pressurized water reactor, as shown in Figure 1. It includes AO rod groups, which include 9 control rod bundles corresponding to the 4th row and 6th column, the 4th row and 10th column, the 6th row and 4th column, the 6th row and 12th column, the 8th row and 8th column, the 10th row and 4th column, the 10th row and 12th column, the 12th row and 6th column, and the 12th row and 10th column, respectively.

[0167] Therefore, according to the above embodiments of this application, control rod bundles are arranged at 69 locations in the core of 177 fuel assemblies. Each control rod bundle is not arranged adjacent to any side, but primarily at adjacent corners. The 69 control rod bundles are divided into 11 groups: T1, T2, T3, T4, TA, TB, AO, SA, SB, SC, and SD. Control rod bundles within the same group are located in rotationally symmetrical positions and employ the same absorber arrangement scheme within the bundle.

[0168] As a preferred approach, rod groups T1, T2, T3, and T4 adopt the in-bundle arrangement of four strong absorbers shown in Figure 2. The strong absorbers are positioned at coordinates (4, 4) and their rotationally symmetrical positions within the 17*17 grid of the fuel assembly. Other rod groups adopt an in-bundle arrangement of 24 strong absorbers. Furthermore, an overlap step is set for each T-bar group; for example, rod groups T1, T2, T3, and T4 overlap sequentially by 90 steps, with the overlap height accounting for 1 / 3 to 1 / 2 of the total stroke.

[0169] This application discloses a control rod arrangement under MODE-C operation and control mode. The arrangement includes two levels: bundle arrangement and core group arrangement. By implementing the technical solution of this application, the differential value of the control rod group meets the operation control requirements of base load operation, non-boron load tracking operation, and load transient in MODE-C operation mode. At the same time, it has limited disturbance to power distribution and can ensure sufficient safety margin.

[0170] The above description is only a specific embodiment of this application, but the protection scope of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the protection scope of this application.

Claims

1. A method for arranging control rods within a bundle of 177-core pressurized water reactors, characterized in that instrumentation grid elements are arranged at the center of a 17*17 grid array assembly, wherein... Four strong absorber rods are respectively arranged at the coordinates (4, 4) in the grid array and at positions 90°, 180° and 270° rotated around the instrument tube grid element.

2. The method for arranging control rods within the control rod bundle of a 177-core pressurized water reactor according to claim 1, characterized in that, Twelve weak absorber rods are arranged at coordinates (6, 3), (9, 3), and (12, 3) within the grid array, and at positions rotated 90°, 180°, and 270° around the instrument tube grid element, respectively; eight weak absorber rods are arranged at coordinates (6, 6) and (9, 6) within the grid array, and at positions rotated 90°, 180°, and 270° around the instrument tube grid element, respectively.

3. The method for arranging control rods within the control rod bundle of a 177-core pressurized water reactor according to claim 1, characterized in that, Four strong absorber rods are respectively arranged at the coordinates (6, 6) in the grid array and at positions 90°, 180° and 270° rotated around the instrument tube grid element.

4. The method for arranging control rods within the control rod bundle of a 177-core pressurized water reactor according to claim 3, characterized in that, Twelve weak absorber rods are arranged at coordinates (6, 3), (9, 3), and (12, 3) within the grid array, and at positions rotated 90°, 180°, and 270° around the instrument tube grid element, respectively; four weak absorber rods are arranged at coordinates (9, 6) within the grid array, and at positions rotated 90°, 180°, and 270° around the instrument tube grid element, respectively.

5. The method for arranging control rods within the control rod bundle of a 177-core pressurized water reactor according to claim 3, characterized in that, Twelve strong absorber rods are arranged at coordinates (6, 3), (9, 3), and (12, 3) within the grid array, and at positions rotated 90°, 180°, and 270° around the instrument tube grid element, respectively; four strong absorber rods are arranged at coordinates (9, 6) within the grid array, and at positions rotated 90°, 180°, and 270° around the instrument tube grid element, respectively.

6. A method for grouping and arranging control rod bundles in a 177-core pressurized water reactor, characterized in that, The reactor core, comprising 177 fuel assemblies, is divided into T-bar groups, S-bar groups, and AO-bar groups to arrange control rod bundles. The T-bar groups are used to control water temperature or power, the S-bar groups provide sufficient negative reactivity during emergency shutdown, and the AO-bar groups control axial power distribution. The control rod bundle in the T-bar group is arranged in the control rod bundle arrangement method of the 177 core pressurized water reactor as described in claim 1 or 2. The control rod bundles in the S-rod group and the AO-rod group are arranged using the control rod bundle arrangement method of the 177 core pressurized water reactor as described in any one of claims 3-5. An overlap step is set for the T-bar group.

7. The method for grouping and arranging control rod bundles in a 177-core pressurized water reactor according to claim 6, characterized in that, The T-bar group is divided into T1 bar group, T2 bar group, T3 bar group, T4 bar group, TA bar group, and TB bar group; the TA bar group and the TB bar group are arranged in the control bar bundle arrangement method of the 177 core pressurized water reactor as described in claim 5.

8. The method for grouping and arranging control rod bundles in a 177-core pressurized water reactor according to claim 7, characterized in that, The T1 rod group, the T2 rod group, the T3 rod group, and the T4 rod group overlap each other in sequence for 90 steps, with the overlap height accounting for 1 / 3 to 1 / 2 of the total stroke.

9. The method for grouping and arranging control rod bundles in a 177-core pressurized water reactor according to claim 7 or 8, characterized in that, The T-bar group is arranged as follows: The four rod bundles of the T1 rod group are respectively arranged in the 6th row and 8th column, the 8th row and 6th column, the 8th row and 10th column, and the 10th row and 8th column of the core. The four rod bundles of the T2 rod group are respectively arranged in the 4th row and 4th column, the 4th row and 12th column, the 12th row and 4th column, and the 12th row and 12th column of the core. The four rod bundles of the T3 rod group are respectively arranged in the positions of the 2nd row and 8th column, the 8th row and 2nd column, the 8th row and 14th column, and the 14th row and 8th column of the core. The four rod bundles of the T4 rod group are respectively arranged in the 6th row and 6th column, the 6th row and 10th column, the 10th row and 6th column, and the 10th row and 10th column of the core. The four control rod bundles of the TA rod group are respectively arranged in the 4th row and 8th column, the 8th row and 4th column, the 8th row and 12th column, and the 12th row and 8th column of the core. The eight control rod bundles of the TB rod group are respectively arranged in the positions of the 2nd row and 6th column, the 2nd row and 10th column, the 6th row and 2nd column, the 6th row and 14th column, the 10th row and 2nd column, the 10th row and 14th column, the 14th row and 6th column, and the 14th row and 10th column of the core.

10. The method for grouping and arranging control rod bundles in a 177-core pressurized water reactor according to claim 6, characterized in that, The S-bar group is divided into SA-bar group, SB-bar group, SC-bar group, and SD-bar group; The eight rod bundles of the SA rod group are respectively arranged in the positions of the 5th row and 5th column, the 5th row and 11th column, the 7th row and 7th column, the 7th row and 9th column, the 9th row and 7th column, the 9th row and 9th column, the 11th row and 5th column, and the 11th row and 11th column of the core. The eight rod bundles of the SB rod group are respectively arranged in the positions of the 5th row and 7th column, the 5th row and 9th column, the 7th row and 5th column, the 7th row and 11th column, the 9th row and 5th column, the 9th row and 11th column, the 11th row and 7th column, and the 11th row and 9th column of the core. The eight rod bundles of the SC rod group are respectively arranged in the positions of the 3rd row and 7th column, the 3rd row and 9th column, the 7th row and 3rd column, the 7th row and 13th column, the 9th row and 3rd column, the 9th row and 13th column, the 13th row and 7th column, and the 13th row and 9th column of the core. The eight rod bundles of the SD rod group are respectively arranged in the positions of the 3rd row and 5th column, the 3rd row and 11th column, the 5th row and 3rd column, the 5th row and 13th column, the 11th row and 3rd column, the 11th row and 13th column, the 13th row and 5th column, and the 13th row and 11th column of the core.

11. The method for grouping and arranging control rod bundles in a 177-core pressurized water reactor according to claim 6, characterized in that, The nine control rod bundles of the AO rod group are arranged in the following positions in the core: 4th row, 6th column; 4th row, 10th column; 6th row, 4th column; 6th row, 12th column; 8th row, 8th column; 10th row, 4th column; 10th row, 12th column; 12th row, 6th column; and 12th row, 10th column.

12. The method for grouping and arranging control rod bundles in a 177-core pressurized water reactor according to claim 6, characterized in that, Control rod bundles are arranged in 69 locations across the 177 fuel assemblies in the reactor core, with each bundle arranged independently.

13. A control rod bundle for a 177-core pressurized water reactor, characterized in that, This includes four strong absorber rods positioned at coordinates (4, 4) within the 17*17 grid array and at positions 90°, 180°, and 270° rotated around the instrument tube grid element.

14. The control rod bundle of the 177-core pressurized water reactor according to claim 13, characterized in that, It includes 12 weak absorber rods arranged at coordinates (6,3), (9,3), (12,3) within the grid array and at positions 90°, 180°, and 270° rotated around the instrument tube grid element, and 8 weak absorber rods arranged at coordinates (6,6), (9,6) within the grid array and at positions 90°, 180°, and 270° rotated around the instrument tube grid element.

15. The control rod bundle of the 177-core pressurized water reactor according to claim 13, characterized in that, It includes four strong absorber rods arranged at coordinates (6, 6) within the grid array and at positions 90°, 180°, and 270° rotated around the instrument tube grid element.

16. The control rod bundle of the 177-core pressurized water reactor according to claim 15, characterized in that, It also includes 12 weak absorber rods arranged at coordinates (6, 3), (9, 3), (12, 3) within the grid array and at positions 90°, 180°, and 270° rotated around the instrument tube grid element, and 4 weak absorber rods arranged at coordinates (9, 6) within the grid array and at positions 90°, 180°, and 270° rotated around the instrument tube grid element.

17. The control rod bundle of the 177-core pressurized water reactor according to claim 15, characterized in that, It also includes 12 strong absorber rods arranged at coordinates (6, 3), (9, 3), (12, 3) within the grid array and at positions 90°, 180°, and 270° rotated around the instrument tube grid element, and 4 strong absorber rods arranged at coordinates (9, 6) within the grid array and at positions 90°, 180°, and 270° rotated around the instrument tube grid element.

18. A control rod bundle grouping arrangement structure for a 177-core pressurized water reactor, characterized in that, include: T-bar assembly, used to control water temperature or power, wherein the T-bar assembly contains a control rod bundle as described in claim 13 or 14 for a 177-core pressurized water reactor. S-rod bundles are used to provide sufficient negative reactivity during emergency reactor shutdown, and the S-rod bundles contain control rod bundles for a 177-core pressurized water reactor as described in any one of claims 15-17. An AO rod assembly is used to control the axial power distribution, and the AO rod assembly contains a control rod bundle for a 177-core pressurized water reactor as described in any one of claims 15-17.

19. The control rod bundle grouping arrangement structure of the 177-core pressurized water reactor according to claim 18, characterized in that, The T-bar group includes T1 bar group, T2 bar group, T3 bar group, T4 bar group, TA bar group, and TB bar group.

20. The control rod bundle grouping arrangement structure of the 177-core pressurized water reactor according to claim 19, characterized in that, The TA rod group contains a control rod bundle as described in claim 17 for a 177-core pressurized water reactor, and the TB rod group contains a control rod bundle as described in claim 17 for a 177-core pressurized water reactor.

21. The control rod bundle grouping arrangement structure of the 177-core pressurized water reactor according to claim 19, characterized in that, The T1 rod group, the T2 rod group, the T3 rod group, and the T4 rod group overlap each other in sequence for 90 steps, with the overlap height accounting for 1 / 3 to 1 / 2 of the total stroke.

22. The control rod bundle grouping arrangement structure of the 177-core pressurized water reactor according to any one of claims 19-21, characterized in that, The T1 rod group includes four control rod bundles corresponding to the 6th row and 8th column, the 8th row and 6th column, the 8th row and 10th column, and the 10th row and 8th column, respectively. The T2 rod group includes four control rod bundles corresponding to the 4th row and 4th column, the 4th row and 12th column, the 12th row and 4th column, and the 12th row and 12th column, respectively. The T3 rod group includes four control rod bundles corresponding to the 2nd row and 8th column, the 8th row and 2nd column, the 8th row and 14th column, and the 14th row and 8th column, respectively; The T4 rod group includes four control rod bundles corresponding to the 6th row and 6th column, the 6th row and 10th column, the 10th row and 6th column, and the 10th row and 10th column, respectively.

23. The control rod bundle grouping arrangement structure of the 177-core pressurized water reactor according to claim 20, characterized in that, The TA rod group includes four control rod bundles corresponding to the 4th row and 8th column, the 8th row and 4th column, the 8th row and 12th column, and the 12th row and 8th column, respectively; the TB rod group includes eight control rod bundles corresponding to the 2nd row and 6th column, the 2nd row and 10th column, the 6th row and 2nd column, the 6th row and 14th column, the 10th row and 2nd column, the 10th row and 14th column, the 14th row and 6th column, and the 14th row and 10th column, respectively.

24. The control rod bundle grouping arrangement structure of the 177-core pressurized water reactor according to claim 18, characterized in that, The S-bar group includes the SA-bar group, SB-bar group, SC-bar group, and SD-bar group.

25. The control rod bundle grouping arrangement structure of the 177-core pressurized water reactor according to claim 24, characterized in that, The SA rod group includes eight control rod bundles corresponding to the 5th row and 5th column, the 5th row and 11th column, the 7th row and 7th column, the 7th row and 9th column, the 9th row and 7th column, the 9th row and 9th column, the 11th row and 5th column, and the 11th row and 11th column, respectively. The SB rod group includes eight control rod bundles corresponding to the 5th row and 7th column, the 5th row and 9th column, the 7th row and 5th column, the 7th row and 11th column, the 9th row and 5th column, the 9th row and 11th column, the 11th row and 7th column, and the 11th row and 9th column, respectively. The SC rod group includes eight control rod bundles corresponding to the 3rd row and 7th column, the 3rd row and 9th column, the 7th row and 3rd column, the 7th row and 13th column, the 9th row and 3rd column, the 9th row and 13th column, the 13th row and 7th column, and the 13th row and 9th column, respectively. The SD rod group includes eight control rod bundles corresponding to the 3rd row and 5th column, the 3rd row and 11th column, the 5th row and 3rd column, the 5th row and 13th column, the 11th row and 3rd column, the 11th row and 13th column, the 13th row and 5th column, and the 13th row and 11th column, respectively.

26. The control rod bundle grouping arrangement structure of the 177-core pressurized water reactor according to claim 18, characterized in that, The AO rod group includes nine control rod bundles corresponding to the 4th row and 6th column, the 4th row and 10th column, the 6th row and 4th column, the 6th row and 12th column, the 8th row and 8th column, the 10th row and 4th column, the 10th row and 12th column, the 12th row and 6th column, and the 12th row and 10th column, respectively.

27. The control rod bundle grouping arrangement structure of the 177-core pressurized water reactor according to claim 18, characterized in that, The reactor core contains 69 locations with control rod bundles arranged in total, with each control rod bundle arranged independently.

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