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

Abstract

The invention belongs to the technical field of control rod arrangement, and discloses control rod bundle grouping arrangement and an in-bundle arrangement method of a 177 reactor core pressurized water reactor, which are used for enhancing the regulation control capability of a control rod and meeting the control requirements of various load changes on the premise of ensuring the safety of a reactor core. According to the in-beam arrangement method, the four strong absorber rods are arranged at the positions of coordinates (4, 4) in the grating array and the positions where the strong absorber rods rotate by 90 degrees, 180 degrees and 270 degrees around an instrument pipe lattice cell respectively; according to the grouping arrangement method, control rod bundles are arranged in a T rod group, an S rod group and an AO rod group in a reactor core of 177 groups of fuel assemblies. According to the technical scheme provided by the invention, on the premise of ensuring the safety of the reactor core, the regulation control capability of the control rod is enhanced, and the control requirements of various load changes are met. Under the specified quantity ratio of the strong absorbers to the weak absorbers, the technical scheme provided by the invention is high in control capability and small in local power distribution disturbance.

Description

Technical Field

[0001] The present application belongs to the technical field of control rod arrangement, and in particular, relates to a control rod bundle grouping arrangement and an intra-bundle arrangement method for a 177-core pressurized water reactor. Background Art

[0002] Mode-C operation and control mode is a pressurized water reactor operation and control mode independently developed by my country. When this operation mode is adopted, the reactor has a strong load tracking capability, allowing the core to quickly reduce or increase the reactor power level according to the change of the grid load. The reactor can perform daily load tracking with a power change form 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 changes linearly to 50% FP within 2 hours, and after running at 50% FP for 6 hours, the power increases linearly to the full power level within 2 hours to adapt to the requirements of daily load changes of the grid.

[0003] At present, the normal operation of nuclear power plant reactors in Mode-C operation and control mode is maintained 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 core coolant temperature and the axial power deviation is controlled manually by the operator;

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

[0006] (3) Use soluble boron to compensate for the longer-term fuel and combustible poison burnup effects and control the gray rod group within the desired operating range.

[0007] The control of the reactor in each of the above scenarios relies heavily on control rods to achieve rapid adjustment of the core reactivity, which places high demands on the arrangement of control rods, as follows:

[0008] Requirement 1: The total control value of the control rod group should be large enough to meet the demand for responsive control capability to quickly adjust a wide range of power changes;

[0009] Requirement 2: During the process of inserting and withdrawing the control rod assembly from the core, the disturbance to the core power distribution should be as small as possible to ensure the core safety margin.

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

[0011] For requirement 2, the value of a single control rod bundle and a single control rod group should be limited to avoid large local power distortion. At the same time, for the movement of control rods with a certain stroke, the scheme design should be used to minimize the impact on power distribution during the movement.

[0012] It can be seen 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 the present application is to provide a control rod bundle grouping arrangement and intra-bundle arrangement method for a 177-core pressurized water reactor, so as to enhance the regulating and controlling capability of the control rods and meet the control requirements of various load changes while ensuring the safety of the core.

[0014] In order to achieve the above objectives, this application provides the following technical solutions:

[0015] In the first aspect, the present application provides a method for arranging control rods in a 177-core pressurized water reactor bundle, arranging an instrument tube grid element at the center position of a 17*17 grid array of the component, and arranging four strong absorber rods at the coordinates (4, 4) in the grid array and at positions rotated 90°, 180°, and 270° around the instrument tube grid element.

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

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

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

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

[0020] In a second aspect, the present application provides a control rod bundle grouping arrangement method for a 177 core pressurized water reactor, wherein the control rod bundles are arranged in a T rod group, an S rod group and an AO rod group in the core of a 177 fuel assembly, wherein the T rod group is used to control water temperature or power, the S rod group is used to provide sufficient negative reactivity during emergency shutdown, and the AO rod group is used to control axial power distribution, wherein:

[0021] The control rod bundle in the T rod 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] And an overlapping step is set for the T-bar group.

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

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

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

[0027] Arrange the four rod bundles of the T1 rod group at the positions of the 6th row and the 8th column, the 8th row and the 6th column, the 8th row and the 10th column, and the 10th row and the 8th column of the core respectively;

[0028] Arrange the four rod bundles of the T2 rod group at the positions of the 4th row and the 4th column, the 4th row and the 12th column, the 12th row and the 4th column, and the 12th row and the 12th column of the core respectively;

[0029] Arrange the four rod bundles of the T3 rod group at the positions of the 2nd row and the 8th column, the 8th row and the 2nd column, the 8th row and the 14th column, and the 14th row and the 8th column of the core respectively;

[0030] Arrange the four rod bundles of the T4 rod group at the positions of the 6th row and the 6th column, the 6th row and the 10th column, the 10th row and the 6th column, and the 10th row and the 10th column of the core respectively;

[0031] Arrange the four control rod bundles of the TA rod group at the positions of the 4th row and the 8th column, the 8th row and the 4th column, the 8th row and the 12th column, and the 12th row and the 8th column of the core respectively;

[0032] The eight control rod bundles of the TB rod group are arranged at 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.

[0033] In some embodiments, the S rod group includes a SA rod group, a SB rod group, a SC rod group, and a SD rod group;

[0034] Arrange the eight rod bundles of the SA rod group at the positions of the 5th row and the 5th column, the 5th row and the 11th column, the 7th row and the 7th column, the 7th row and the 9th column, the 9th row and the 7th column, the 9th row and the 9th column, the 11th row and the 5th column, and the 11th row and the 11th column of the core respectively;

[0035] Arrange the eight rod bundles of the SB rod group at 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;

[0036] Arrange the eight rod bundles of the SC rod group at the positions of the 3rd row and the 7th column, the 3rd row and the 9th column, the 7th row and the 3rd column, the 7th row and the 13th column, the 9th row and the 3rd column, the 9th row and the 13th column, the 13th row and the 7th column, and the 13th row and the 9th column of the core respectively;

[0037] The eight rod bundles of the SD rod group are arranged at 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.

[0038] In some embodiments, the 9 control rod bundles of the AO rod group are arranged at 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 clusters are arranged at 69 positions in a core of 177 fuel assemblies, and the control rod clusters are not arranged adjacent to each other.

[0040] In the third aspect, the present application provides a control rod cluster of a 177-core pressurized water reactor, including four strong absorber rods arranged at the coordinates (4, 4) in the grid array of the component 17*17 and rotated 90°, 180°, and 270° around the instrument 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), and (12, 3) in the grid array and at positions rotated 90°, 180°, and 270° around the instrument tube grid element, and 8 weak absorber rods arranged at coordinates (6, 6) and (9, 6) in the grid array and at positions rotated 90°, 180°, and 270° around the instrument tube grid element.

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

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

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

[0045] In a fourth aspect, the present application provides a control rod cluster grouping arrangement structure for a 177-core pressurized water reactor, comprising:

[0046] A T-rod group, used to control water temperature or power, wherein the control rod bundle of the 177-core pressurized water reactor is arranged in the T-rod group;

[0047] An S rod group, used to provide sufficient negative reactivity during emergency shutdown, wherein the control rod bundle of the 177-core pressurized water reactor is arranged in the S rod group;

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

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

[0050] In some embodiments, the TA rod group is provided with a control rod cluster of the 177 core pressurized water reactor, and the TB rod group is provided with a control rod cluster 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 by 90 steps in sequence, and the overlapping height accounts 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 clusters corresponding to the 6th row and the 8th column, the 8th row and the 6th column, the 8th row and the 10th column, and the 10th row and the 8th column respectively;

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

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

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

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

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

[0059] In some embodiments, the SA rod group includes 8 control rod clusters corresponding to the 5th row and the 5th column, the 5th row and the 11th column, the 7th row and the 7th column, the 7th row and the 9th column, the 9th row and the 7th column, the 9th row and the 9th column, the 11th row and the 5th column, and the 11th row and the 11th column respectively;

[0060] The SB rod group includes 8 control rod clusters corresponding to the 5th row and the 7th column, the 5th row and the 9th column, the 7th row and the 5th column, the 7th row and the 11th column, the 9th row and the 5th column, the 9th row and the 11th column, the 11th row and the 7th column, and the 11th row and the 9th column respectively;

[0061] The SC rod group includes 8 control rod clusters corresponding to the 7th column of the 3rd row, the 9th column of the 3rd row, the 3rd column of the 7th row, the 13th column of the 7th row, the 3rd column of the 9th row, the 13th column of the 9th row, the 7th column of the 13th row, and the 9th column of the 13th row;

[0062] The SD rod group includes 8 control rod clusters 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 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, respectively.

[0064] In some embodiments, the control rod cluster grouping arrangement structure of the 177-core pressurized water reactor includes arranging control rod clusters at a total of 69 positions in the core of 177 groups of fuel assemblies, and each control rod cluster is not arranged adjacent to each other.

[0065] Compared with the prior art, the control rod bundle grouping arrangement and the intra-bundle arrangement method of the 177-core pressurized water reactor provided by the present application have the following beneficial effects:

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

[0067] Under the specified ratio of strong absorbers to weak absorbers, the technical solution provided by the present application has strong control capability and little disturbance to the local power distribution.

[0068] The technical solution provided by the present application has sufficient reactivity control capability, can realize non-boron load tracking operation within 90% of the cycle life, and the load increase and decrease rate during the load tracking process reaches 25% FP / h; realizes simultaneous automatic control of different core parameters (including axial power distribution, water temperature, power). In addition, the disturbance amplitude of the power distribution of the core caused by the insertion of the control rod is less than 8%.

[0069] When the technical solution provided in the present application is used, a shutdown margin greater than 2100 pcm can be provided throughout the entire life of the core. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for the technical description.

[0071] Figure 1 A schematic diagram of the arrangement of control rod bundles in groups for a 177-core pressurized water reactor provided in the present application, with row and column numbers shown;

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

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

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

[0075] In the figure, □ represents the fuel grid element, ■ represents the strong absorber rod, represents a weak absorber rod, Indicates the instrument tube grid element; Figures 2 to 4 The upper left corner is the coordinate origin in the grid array, the right side is the horizontal coordinate, and the downward side is the vertical coordinate, and all coordinate values ​​are positive numbers. DETAILED DESCRIPTION

[0076] The following is further explained in detail through specific implementation methods.

[0077] The present application provides Examples 1 to 12. For a single control rod cluster, when the number of absorber rods in the cluster is certain, the design optimization is performed for the number of strong absorber rods and weak absorber rods in the cluster assembly, and the layout scheme under the condition of specific number distribution of the two is optimized, and then the present application forms a layout scheme within the control rod cluster.

[0078] The present application provides Examples 13 to 20. For the core level, according to each scenario of the MODE-C operation control mode, rod bundle combinations and detailed distributions for different control purposes are divided. Specifically, the present application sets a T rod temperature adjustment rod group to control the water temperature; sets an AO rod axial power offset control rod group to control the core axial power distribution; and sets an S rod group shutdown rod group to provide sufficient negative reactivity during core protection shutdown. The T rod group is divided into T1 rod group, T2 rod group, T3 rod group, T4 rod group, TA rod group, and TB rod group according to control needs, and the S rod group is divided into SA rod group, SB rod group, SC rod group, and SD rod group according to needs. For the T rod group with a larger total reactivity, an overlapping step is set between each rod group to control the reactivity introduction rate.

[0079] Example 1

[0080] Embodiment 1 provides a method for arranging control rods in a 177 core pressurized water reactor, wherein an instrument tube grid element is arranged at the center position (9, 9) of a grid array of a component 17*17, and four strong absorber rods are arranged at the position of coordinates (4, 4) in the grid array and at positions rotated 90°, 180°, and 270° around the instrument tube grid element, i.e., 1 / 4 rotationally symmetrical positions.

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

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

[0083] Specifically, Figure 2 As shown, a weak absorber rod is arranged at the coordinates (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) in the grid array.

[0084] The rest of the positions are equipped with fuel grid elements, such as Figure 2 shown.

[0085] Too many strong absorbers will lead to too large a rod group value, which will cause serious distortion of power distribution when inserted into the core, which is not conducive to core safety. If there are too few strong absorbers, the control ability may be too weak to achieve the purpose of effectively controlling the target parameters. Figure 2 This is a feasible technical solution obtained through comprehensive consideration and optimization research.

[0086] Example 2

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

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

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

[0090] Eight weak absorber rods are arranged at the coordinates (6, 6) and (9, 6) in the grid array and at the positions rotated 90°, 180° and 270° 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 cluster refer to Example 1 and are not described in detail here.

[0092] Example 3

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

[0094] Example 4

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

[0096] 8 strong absorber rods arranged at coordinates (4, 4), (14, 4), (4, 14), (14, 14), (6, 6), (12, 6), (6, 12), (12, 12) in the grid array of component 17*17; and

[0097] There are 16 weak absorber rods arranged in the grid array of component 17*17 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 in a 177-core pressurized water reactor bundle, wherein an instrument tube grid element is arranged at the center of a 17*17 grid array of the assembly, and eight strong absorber rods are arranged at coordinates (4, 4) and (6, 6) in the grid array and at positions rotated 90°, 180°, and 270° around the instrument tube grid element, i.e., 1 / 4 rotationally symmetrical positions.

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

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

[0102] Specifically, Figure 3 As shown, a weak absorber rod is arranged at the 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) in the grid array.

[0103] The rest of the positions are equipped with fuel grid elements, such as Figure 3 shown.

[0104] Example 6

[0105] Using the control rod cluster arrangement method for a 177-core pressurized water reactor provided in Example 5, Example 6 provides a control rod cluster for a 177-core pressurized water reactor, in which the arrangement of weak absorber rods and strong absorber rods 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 in a 177-core pressurized water reactor, wherein an instrument tube grid element is arranged at the center of a 17*17 grid array of the assembly, and 24 strong absorber rods are arranged at coordinates (4, 4), (6, 6), (6, 3), (9, 3), (12, 3), and (6, 9) in the grid array and at positions rotated 90°, 180°, and 270° around the instrument tube grid element, i.e., 1 / 4 rotationally symmetric positions; and weak absorber rods are no longer arranged.

[0108] Specifically, Figure 4 As shown, at the coordinates (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), and (12, 15) in the grid array, there is a strong absorber rod.

[0109] The rest of the positions are equipped with fuel grid elements, such as Figure 4 shown.

[0110] By designing in Example 7, all the strong absorbers are arranged to maximize the value. The arrangement of the strong absorbers is specially designed and unique to the present application.

[0111] Example 8

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

[0113] Example 9

[0114] Example 9 is based on the technical solution of Example 1 and is further improved. Example 9 provides a control rod bundle arrangement method for a 177-core pressurized water reactor, and the weak absorber rods in Example 1 are replaced with strong absorber rods.

[0115] Example 10

[0116] Using the control rod cluster arrangement method for a 177-core pressurized water reactor provided in Example 9, Example 10 provides a control rod cluster for a 177-core pressurized water reactor, which control rod cluster only includes strong absorber rods. The arrangement coordinates of the strong absorber rods are as shown in Example 7 and are not described in detail here.

[0117] Embodiment 11

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

[0119] Example 12

[0120] Using the control rod cluster arrangement method for a 177-core pressurized water reactor provided in Example 11, Example 12 provides a control rod cluster for a 177-core pressurized water reactor, which control rod cluster only includes strong absorber rods. The arrangement coordinates of the strong absorber rods are as shown in Example 7 and are not described in detail here.

[0121] Example 13

[0122] Embodiment 13 provides a control rod cluster grouping arrangement method for a 177-core pressurized water reactor, comprising:

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

[0124] The control rod bundles in the T rod group are arranged using the control rod bundle arrangement method for a 177 core pressurized water reactor as described in Example 1;

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

[0126] Set overlapping steps for the T-bar group.

[0127] Embodiment 14

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

[0129] A T rod group, used to control water temperature or power, wherein the T rod group is provided with a control rod bundle of the 177 core pressurized water reactor as described in Example 2;

[0130] An S rod group is used to provide sufficient negative reactivity during emergency shutdown, and the S rod group is provided with a control rod bundle of the 177 core pressurized water reactor as described in Example 7, Example 9 or Example 11;

[0131] The AO rod group is used to control the axial power distribution, and the AO rod group is provided with a control rod bundle of the 177-core pressurized water reactor as described in Example 7, Example 9 or Example 11.

[0132] Embodiment 15

[0133] Example 15 is based on the technical solution of Example 13 and is further improved. Example 15 provides a control rod bundle grouping arrangement method for 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 the TB rod group are arranged using the control rod bundle arrangement method of the 177-core pressurized water reactor described in Example 7, Example 9 or Example 11.

[0135] The T1 rod group, T2 rod group, T3 rod group and T4 rod group overlap by 90 steps in sequence, and the overlapping height accounts for 1 / 3 to 1 / 2 of the total stroke.

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

[0137] The four rod bundles of the T1 rod group are arranged at the positions of the 6th row and the 8th column, the 8th row and the 6th column, the 8th row and the 10th column, and the 10th row and the 8th column of the core respectively;

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

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

[0140] Arrange the four rod bundles of the T4 rod group at the positions of the 6th row and the 6th column, the 6th row and the 10th column, the 10th row and the 6th column, and the 10th row and the 10th column of the core respectively;

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

[0142] The eight control rod bundles of the TB rod group are arranged at 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 cluster grouping arrangement method for a 177-core pressurized water reactor provided in Example 15, Example 16 provides a control rod cluster grouping arrangement structure for a 177-core pressurized water reactor, such as Figure 1 As shown, including:

[0145] T1 rod group, including 4 control rod clusters corresponding to the 8th column of the 6th row, the 6th column of the 8th row, the 10th column of the 8th row and the 8th column of the 10th row;

[0146] A T2 rod group, including four control rod clusters corresponding to the 4th row and the 4th column, the 4th row and the 12th column, the 12th row and the 4th column, and the 12th row and the 12th column;

[0147] A T3 rod group, including four control rod clusters corresponding to the 8th column of the 2nd row, the 2nd column of the 8th row, the 14th column of the 8th row, and the 8th column of the 14th row;

[0148] A T4 rod group, including four control rod clusters corresponding to the 6th row and the 6th column, the 6th row and the 10th column, the 10th row and the 6th column, and the 10th row and the 10th column;

[0149] a TA rod group, including four control rod bundles corresponding to the positions of the 4th row and the 8th column, the 8th row and the 4th column, the 8th row and the 12th column, and the 12th row and the 8th column, respectively;

[0150] The TB rod group includes 8 control rod bundles corresponding to the positions of the 2nd row and the 6th column, the 2nd row and the 10th column, the 6th row and the 2nd column, the 6th row and the 14th column, the 10th row and the 2nd column, the 10th row and the 14th column, the 14th row and the 6th column, and the 14th row and the 10th column, respectively.

[0151] Embodiment 17

[0152] Embodiment 17 is based on the technical solution of Embodiment 13 or Embodiment 15 and is further improved. Embodiment 17 provides a control rod bundle grouping arrangement method for a 177 core pressurized water reactor, further dividing the S rod group into an SA rod group, an SB rod group, an SC rod group, and an SD rod group, such as Figure 1 Specifically:

[0153] Arrange the eight rod bundles of the SA rod group at the positions of the 5th row and the 5th column, the 5th row and the 11th column, the 7th row and the 7th column, the 7th row and the 9th column, the 9th row and the 7th column, the 9th row and the 9th column, the 11th row and the 5th column, and the 11th row and the 11th column of the core respectively;

[0154] Arrange the eight rod bundles of the SB rod group at the positions of the 5th row and the 7th column, the 5th row and the 9th column, the 7th row and the 5th column, the 7th row and the 11th column, the 9th row and the 5th column, the 9th row and the 11th column, the 11th row and the 7th column, and the 11th row and the 9th column of the core respectively;

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

[0156] The eight rod bundles of the SD rod group are arranged at 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] Embodiment 18

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

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

[0160] an SB rod group, comprising 8 control rod clusters corresponding to the 7th column of the 5th row, the 9th column of the 5th row, the 5th column of the 7th row, the 11th column of the 7th row, the 5th column of the 9th row, the 11th column of the 9th row, the 7th column of the 11th row, and the 9th column of the 11th row;

[0161] a SC rod group, comprising 8 control rod clusters corresponding to the 7th column of the 3rd row, the 9th column of the 3rd row, the 3rd column of the 7th row, the 13th column of the 7th row, the 3rd column of the 9th row, the 13th column of the 9th row, the 7th column of the 13th row, and the 9th column of the 13th row;

[0162] The SD rod group includes 8 control rod clusters 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 13th row and 11th column respectively.

[0163] Embodiment 19

[0164] Example 19 is based on the technical solutions of Example 13, Example 15 or Example 17 and is further improved. Example 19 provides a method for grouping and arranging control rod bundles of a 177-core pressurized water reactor, and further arranges the 9 control rod bundles of the AO rod group at 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] Embodiment 20

[0166] Using the control rod cluster grouping arrangement method for a 177-core pressurized water reactor provided in Example 19, Example 20 provides a control rod cluster grouping arrangement structure for a 177-core pressurized water reactor, such as Figure 1 As shown, the AO rod group includes 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, respectively.

[0167] Therefore, according to the above-mentioned embodiment of the present application, control rod clusters are arranged at 69 positions in the core of 177 fuel assemblies, and each control rod cluster is not arranged adjacent to the edge, but mainly arranged adjacent to the corner. The control rod clusters arranged at 69 positions are divided into 11 rod groups, namely T1 rod group, T2 rod group, T3 rod group, T4 rod group, TA rod group, TB rod group, AO rod group, SA rod group, SB rod group, SC rod group, and SD rod group. The control rod clusters in the same rod group are located at rotationally symmetrical positions and adopt the same arrangement scheme of absorbers in the rod cluster.

[0168] As a preferred method, the T1 rod group, the T2 rod group, the T3 rod group, and the T4 rod group adopt Figure 2 The bundle arrangement scheme with 4 strong absorbers is shown, and the strong absorbers are arranged at the coordinates (4, 4) of the fuel assembly 17*17 grid array and its rotationally symmetrical position. The other rod groups adopt the bundle arrangement scheme with 24 strong absorbers. And each T rod group is set with overlapping steps, for example, the T1 rod group, T2 rod group, T3 rod group, and T4 rod group overlap 90 steps in sequence, and the overlapping height accounts for 1 / 3 to 1 / 2 of the total stroke.

[0169] The present application discloses a control rod arrangement under a MODE-C operation and control mode. The arrangement scheme includes two levels: intra-bundle arrangement and core group arrangement. By implementing the technical scheme of the present application, the calculus value of the control rod group meets the operation control requirements such as base load operation, non-boron load tracking operation, and load transient under the MODE-C operation mode. At the same time, the disturbance to the power distribution is limited, and sufficient safety margin can be guaranteed.

[0170] The above description is only a specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed in the present application should be covered within the protection scope of the present application.

Claims

1. A control rod arrangement method for a 177 core pressurized water reactor, wherein an instrument tube grid element is arranged at the center of a 17*17 grid array of components, characterized in that: The four strong absorber rods are respectively arranged at the position of coordinate (4, 4) in the grid array and at the positions rotated 90°, 180° and 270° around the grid element of the instrument tube.

2. The control rod arrangement method for a 177 core pressurized water reactor according to claim 1, characterized in that: The 12 weak absorber rods are arranged at the coordinates (6, 3), (9, 3), and (12, 3) in the grid array and at the positions rotated 90°, 180°, and 270° around the grid element of the instrument tube; the 8 weak absorber rods are arranged at the coordinates (6, 6), (9, 6) in the grid array and at the positions rotated 90°, 180°, and 270° around the grid element of the instrument tube.

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

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

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

6. A control rod cluster grouping arrangement method for a 177 core pressurized water reactor, characterized in that: In the core of the 177-group fuel assembly, control rod bundles are arranged in the T rod group, S rod group and AO rod group. The T rod group is used to control water temperature or power, the S rod group is used to provide sufficient negative reactivity during emergency shutdown, and the AO rod group is used to control axial power distribution. The control rod bundle in the T rod group is arranged by the control rod bundle arrangement method of the 177 core pressurized water reactor as claimed in claim 1 or 2; The control rod bundles in the S rod group and the AO rod group are arranged by the control rod bundle arrangement method for a 177 core pressurized water reactor according to any one of claims 3 to 5; And an overlapping step is set for the T-bar group.

7. The control rod cluster grouping arrangement method for a 177-core pressurized water reactor according to claim 6, characterized in that: The T rod groups are divided into T1 rod group, T2 rod group, T3 rod group, T4 rod group, TA rod group and TB rod group; the TA rod group and the TB rod group are arranged using the control rod bundle arrangement method for a 177-core pressurized water reactor as claimed in claim 5.

8. The control rod cluster grouping arrangement method for 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 by 90 steps in sequence, and the overlapping height accounts for 1 / 3 to 1 / 2 of the total stroke.

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

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

11. The control rod cluster grouping arrangement method for a 177-core pressurized water reactor according to claim 6, characterized in that: The 9 control rod bundles of the AO rod group are arranged at 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.

12. The control rod cluster grouping arrangement method for a 177-core pressurized water reactor according to claim 6, characterized in that: Control rod bundles are arranged at 69 positions in the core of 177 fuel assemblies, and the control rod bundles are not arranged adjacent to each other.

13. A control rod cluster for a 177 core pressurized water reactor, characterized in that: It comprises four strong absorber rods arranged at the coordinates (4, 4) in the grid array of the component 17*17 and at the positions rotated 90°, 180° and 270° around the grid element of the instrument tube.

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

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

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

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

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

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

20. The control rod cluster grouping arrangement structure of the 177-core pressurized water reactor according to claim 19, characterized in that: The TA rod group is provided with a control rod cluster of the 177 core pressurized water reactor as claimed in claim 17, and the TB rod group is provided with a control rod cluster of the 177 core pressurized water reactor as claimed in claim 17.

21. The control rod cluster 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 by 90 steps in sequence, and the overlapping height accounts for 1 / 3 to 1 / 2 of the total stroke.

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

23. The control rod cluster 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 clusters corresponding to the 8th column of the 4th row, the 4th column of the 8th row, the 12th column of the 8th row and the 8th column of the 12th row respectively; the TB rod group includes eight control rod clusters corresponding to the 6th column of the 2nd row, the 10th column of the 2nd row, the 2nd column of the 6th row, the 14th column of the 6th row, the 2nd column of the 10th row, the 14th column of the 10th row, the 6th column of the 14th row and the 10th column of the 14th row.

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

25. The control rod cluster grouping arrangement structure of the 177-core pressurized water reactor according to claim 24, characterized in that: The SA rod group includes 8 control rod clusters corresponding to the 5th row and the 5th column, the 5th row and the 11th column, the 7th row and the 7th column, the 7th row and the 9th column, the 9th row and the 7th column, the 9th row and the 9th column, the 11th row and the 5th column, and the 11th row and the 11th column respectively; The SB rod group includes 8 control rod clusters corresponding to the 5th row and the 7th column, the 5th row and the 9th column, the 7th row and the 5th column, the 7th row and the 11th column, the 9th row and the 5th column, the 9th row and the 11th column, the 11th row and the 7th column, and the 11th row and the 9th column respectively; The SC rod group includes 8 control rod clusters corresponding to the 7th column of the 3rd row, the 9th column of the 3rd row, the 3rd column of the 7th row, the 13th column of the 7th row, the 3rd column of the 9th row, the 13th column of the 9th row, the 7th column of the 13th row, and the 9th column of the 13th row; The SD rod group includes 8 control rod clusters 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 cluster grouping arrangement structure of the 177-core pressurized water reactor according to claim 18, characterized in that: The AO rod group includes 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, respectively.

27. The control rod cluster grouping arrangement structure of the 177-core pressurized water reactor according to claim 18, characterized in that: Control rod bundles are arranged at 69 positions in the core of 177 fuel assemblies, and the control rod bundles are not arranged adjacent to each other.

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