CN104952493B - A kind of control rod distributed architecture of 177 reactor core - Google Patents

A kind of control rod distributed architecture of 177 reactor core Download PDF

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CN104952493B
CN104952493B CN201510238451.3A CN201510238451A CN104952493B CN 104952493 B CN104952493 B CN 104952493B CN 201510238451 A CN201510238451 A CN 201510238451A CN 104952493 B CN104952493 B CN 104952493B
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row
arrange
groups
lattice
rod
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CN104952493A (en
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陈长
李庆
刘启伟
李向阳
周金满
吴磊
于颖锐
王丹
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Nuclear Power Institute of China
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Nuclear Power Institute of China
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    • GPHYSICS
    • G21NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21CNUCLEAR REACTORS
    • G21C3/00Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
    • G21C3/30Assemblies of a number of fuel elements in the form of a rigid unit
    • G21C3/32Bundles of parallel pin-, rod-, or tube-shaped fuel elements
    • G21C3/326Bundles of parallel pin-, rod-, or tube-shaped fuel elements comprising fuel elements of different composition; comprising, in addition to the fuel elements, other pin-, rod-, or tube-shaped elements, e.g. control rods, grid support rods, fertile rods, poison rods or dummy rods
    • G21C3/328Relative disposition of the elements in the bundle lattice
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00Energy generation of nuclear origin
    • Y02E30/30Nuclear fission reactors

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)

Abstract

The invention discloses a kind of control rod distributed architecture of 177 reactor core, including 61 beam control rods;61 beam control rods are divided into 8 groups, are respectively R groups, G1 groups, G2 groups, N1 groups, N2 groups, SA groups, SB groups and SC groups;Wherein, R groups are temperature regulating rod, and G1 groups, G2 groups, N1 groups and N2 groups are power back-off stick, and SA groups, SB groups and SC groups are shut-down rod;G1 groups and G2 groups control bar construction by grey body, remaining group controls bar construction by black matrix.The present invention is set by the quantity to temperature regulating rod, power back-off stick and shut-down rod, and it is rationally grouped, and the spatial position of each control rod is optimized, it realizes and is using 61 beam control rods, in the case of not increasing pressure vessels top cover the number of openings, provide enough Shutdown margins for 177 reactor cores, Shutdown margin, which meets, to reload and demand for security that 18 months reload in year.

Description

A kind of control rod distributed architecture of 177 reactor core
Technical field
The present invention relates to the control rod distributions in pressurized-water reactor nuclear power plant reactor field, especially reactor core.
Background technology
Fuel assembly is the important component of nuclear reactor.Nuclear reactor design is the key that nuclear power station is set Count one of content.The main task of nuclear reactor design is to meet compressed water reactor nuclear power from the angle offer of nuclear reactor physics Stand the nuclear reactor of general design requirement, including determine fuel assembly number, fuel assembly nuclear reactor cloth It puts.
Usual million kilowatt Three links theory pressurized-water reactor nuclear power plant reactor core is made of 157 fuel assemblies, heap Core power density is larger, and thermal technology's safety margin is relatively low.
To solve the above-mentioned problems, Chinese patent ZL200610021862.8 discloses a kind of reactor of nuclear power station Core, it includes 177 fuel assemblies, and compared with 157 reactor cores, core power density reduces 10% to 15%, security higher.
But 177 reactor cores add fuel assembly number compared with 157 reactor cores, if using the control identical with 157 reactor cores Stick Distribution Strategy processed, then reactive control ability Shortcomings, it is impossible to provide enough Shutdown margins to ensure safety.As increased The quantity of control rod, then the number of openings on pressure vessels top cover necessarily increase, this can make the reliability of construction of pressure vessel Into influence.
How to be a problem to be solved for the rational control rod distributed architecture of 177 Core Designs.
The present invention is for 177 reactor core shown in FIG. 1 in Chinese patent ZL200610021862.8.
The content of the invention
The purpose of the present invention is to be to overcome the deficiencies of the prior art and provide a kind of control rod distributed architecture of 177 reactor core, The present invention can be provided in the case where not increasing control rod quantity and not increasing pressure vessels top cover the number of openings for 177 reactor cores Enough Shutdown margins.
The purpose of the present invention is achieved through the following technical solutions:
A kind of control rod distributed architecture of 177 reactor core, including 61 beam control rods;61 beam control rods are divided into 8 groups, are respectively R Group, G1 groups, G2 groups, N1 groups, N2 groups, SA groups, SB groups and SC groups;Wherein, R groups be temperature regulating rod, G1 groups, G2 groups, N1 groups and N2 groups are power back-off stick, and SA groups, SB groups and SC groups are shut-down rod;R groups include corresponding 2nd row eighth row, the 6th respectively and arrange the 6th Row, the 6th arrange the 10th row, the 8th arrange the 2nd row, the 8th arrange the 14th row, the 10th arrange the 6th row, the 10th arrange the 10th row, the 14th row eighth row 8 beam control rods of fuel assembly;G1 groups include corresponding 4th row eighth row, the 8th respectively and arrange the 4th row, and the 8th arranges the 12nd row, the 12nd row 4 beam control rods of the fuel assembly of eighth row;G2 groups include respectively correspond to the 4th arrange the 6th row, the 4th arrange the 10th row, the 6th arrange the 4th row, 6th arrange the 12nd row, the 10th arrange the 4th row, the 10th arrange the 12nd row, the 12nd arrange the 6th row, the 12nd arrange the 10th row fuel assembly 8 beams Control rod;N1 groups include corresponding to the 4th respectively and arrange the 4th row, the 4th arrange the 12nd row, the 6th row eighth row, the 8th arrange the 6th row, the 8th arrange the 10th Row, the 10th row eighth row, the 12nd arrange the 4th row, the 12nd arrange the 12nd row fuel assembly 8 beam control rods;N2 groups include corresponding to respectively 2nd arrange the 6th row, the 2nd arrange the 10th row, the 6th arrange the 2nd row, the 6th arrange the 14th row, the 10th arrange the 2nd row, the 10th arrange the 14th row, the 15th row 6th row, the 15th arrange the 10th row fuel assembly 8 beam control rods;SA groups, which include corresponding to the 3rd respectively, to be arranged the 5th row, the 3rd arranges the 11st Row, the 5th arrange the 3rd row, the 5th arrange the 13rd row, the 8th row eighth row, the 11st arrange the 3rd row, the 11st arrange the 13rd row, the 13rd arrange the 5th row, the 13 arrange 9 beam control rods of the fuel assembly of the 11st row;SB groups include corresponding to the 3rd respectively and arrange the 7th row, the 3rd arrange the 9th row, the 7th arrange the 3 rows, the 7th arrange the 13rd row, the 9th arrange the 3rd row, the 9th arrange the 13rd row, the 13rd arrange the 7th row, and the 3rd arranges 8 beams of the fuel assembly of the 9th row Control rod;SC groups include corresponding to the 5th respectively and arrange the 5th row, the 5th arrange the 11st row, the 7th arrange the 7th row, the 7th arrange the 9th row, the 9th arrange the 7th Row, the 9th arrange the 9th row, the 11st arrange the 5th row, the 11st arrange the 11st row fuel assembly 8 beam control rods;G1 groups and G2 groups are by grey body Bar construction is controlled, remaining group controls bar construction by black matrix.
The present invention is set by the quantity to temperature regulating rod, power back-off stick and shut-down rod, to temperature regulating rod, power Shim rod and shut-down rod are rationally grouped, and the spatial position of each control rod is optimized, and are realized and are being used 61 beams Control rod(Control rod quantity is identical with 157 reactor cores, and the present invention is without increasing control rod quantity)In the case of, it is carried for 177 reactor cores Enough Shutdown margins are supplied, Shutdown margin, which meets, to reload and demand for security that 18 months reload in year.
Meanwhile the present invention is identical with the control rod quantity used in 157 reactor cores, from without increasing on pressure vessels top cover The number of openings, the structural reliability for avoiding pressure vessel are damaged, and ensure that the structural reliability of pressure vessel.
Further, it is made of per Shu Suoshu grey bodies control rod 12 Gen Yin-indium-Cd uptake stick and 12 stainless steel bars.
Compared with the grey body control rod used in 157 reactor cores, the number of silver-indium-Cd uptake stick in grey body control rod of the invention Amount increases to 12 by 8, further improves the reactive control ability to 177 reactor cores.
Further, it is made of per Shu Suoshu black matrixes control rod 24 Gen Yin-indium-Cd uptake stick.
Further, in the grey body control rod, 12 silver-indium-Cd uptake sticks are right respectively in the grid of 17*17 Answer the 3rd row foundation frame, the 6th lattice of the 6th row, the 6th row foundation frame, the 12nd lattice of the 6th row, the 3rd lattice of the 9th row, the 6th lattice of the 9th row, the 9th row 12 lattice, the 15th lattice of the 9th row, the 6th lattice of the 12nd row, the 12nd row foundation frame, the 12nd lattice of the 12nd row, the 15th row foundation frame;The grey body control In stick processed, 12 stainless steel bars correspond to the 6th lattice of the 3rd row, the 12nd lattice of the 3rd row, the 4th row the 4th respectively in the grid of 17*17 Lattice, the 14th lattice of the 4th row, the 3rd lattice of the 6th row, the 15th lattice of the 6th row, the 3rd lattice of the 12nd row, the 15th lattice of the 12nd row, the 4th lattice of the 14th row, The 14th lattice of 14 row, the 6th lattice of the 15th row, the 12nd lattice of the 15th row.
Further, in the grey body control rod, 12 silver-indium-Cd uptake sticks are right respectively in the grid of 17*17 Answer the 6th lattice of the 3rd row, the 12nd lattice of the 3rd row, the 3rd lattice of the 6th row, the 6th row foundation frame, the 15th lattice of the 6th row, the 6th lattice of the 9th row, the 9th row 12 lattice, the 3rd lattice of the 12nd row, the 12nd row foundation frame, the 15th lattice of the 12nd row, the 6th lattice of the 15th row, the 12nd lattice of the 15th row;The grey body control In stick processed, 12 stainless steel bars correspond to the 3rd row foundation frame, the 4th lattice of the 4th row, the 4th row the respectively in the grid of 17*17 14 lattice, the 6th lattice of the 6th row, the 12nd lattice of the 6th row, the 3rd lattice of the 9th row, the 15th lattice of the 9th row, the 5th lattice of the 12nd row, the 12nd lattice of the 12nd row, The 4th lattice of 14th row, the 14th lattice of the 14th row, the 15th row foundation frame.
By carrying out reasonable Arrangement to the spatial position of silver-indium-Cd uptake stick and stainless steel bar in grey body control rod, into one Step improves the reactive control ability of grey body control rod.
The advantages of the present invention are:
1. the present invention is set by the quantity to temperature regulating rod, power back-off stick and shut-down rod, to temperature regulating rod, work( Rate shim rod and shut-down rod are rationally grouped, and the spatial position of each control rod is optimized, and are realized using 61 Beam control rod(Control rod quantity is identical with 157 reactor cores, and the present invention is without increasing control rod quantity)In the case of, it is 177 reactor cores Provide enough Shutdown margins, Shutdown margin, which meets, to reload and demand for security that 18 months reload in year.
2. the present invention is identical with the control rod quantity used in 157 reactor cores, from without increasing opening on pressure vessels top cover Hole number, the structural reliability for avoiding pressure vessel are damaged, and ensure that the structural reliability of pressure vessel.
3. compared with the grey body control rod used in 157 reactor cores, silver-indium-Cd uptake stick in grey body control rod of the invention Quantity increases to 12 by 8, further improves the reactive control ability to 177 reactor cores.
4. by carrying out reasonable Arrangement to the spatial position of silver-indium-Cd uptake stick and stainless steel bar in grey body control rod, into One step improves the reactive control ability of grey body control rod.
Description of the drawings
It, below will be to describing what is used required in the embodiment of the present invention in order to illustrate more clearly of the embodiment of the present invention Attached drawing is briefly described.It will be apparent that the accompanying drawings in the following description is only some embodiments described in the present invention, it is right For those skilled in the art, without creative efforts, can also it be obtained according to following attached drawing Its attached drawing.
Fig. 1 is the schematic top plan view that control rod is distributed in 177 reactor cores;
Fig. 2 is the schematic top plan view that silver-indium-Cd uptake stick and stainless steel bar is distributed in fuel assembly in grey body control rod A;
Fig. 3 is the schematic top plan view that silver-indium-Cd uptake stick and stainless steel bar is distributed in fuel assembly in grey body control rod B;
Wherein, the corresponding parts title of reference numeral is as follows:
1st, 3- silver-indium-Cd uptake stick, 2,4- stainless steel bars.
Specific embodiment
In order to which those skilled in the art is made to more fully understand the present invention, below in conjunction with the attached drawing in the embodiment of the present invention Clear, complete description is carried out to the technical solution in the embodiment of the present invention.It will be apparent that embodiment described below is only It is the part rather than whole in the embodiment of the present invention.Based on the embodiment that the present invention records, those skilled in the art are not The other all embodiments obtained in the case of making the creative labor, in the scope of protection of the invention.
It should be noted that it is of the invention when describing the position of control rod, silver-indium-Cd uptake stick and stainless steel bar, according to From top to bottom, from a left side to by mode counted.
Embodiment 1:
As shown in Figure 1, a kind of control rod distributed architecture of 177 reactor core, including 61 beam control rods;
61 beam control rods are divided into 8 groups, are respectively R groups, G1 groups, G2 groups, N1 groups, N2 groups, SA groups, SB groups and SC groups;
Wherein, R groups be temperature regulating rod, G1 groups, G2 groups, N1 groups and N2 groups be power back-off stick, SA groups, SB groups and SC groups For shut-down rod;
R groups include corresponding to the 2nd row eighth row respectively, the 6th arrange the 6th row, the 6th arrange the 10th row, the 8th arrange the 2nd row, the 8th arrange the 14th Row, the 10th arrange the 6th row, the 10th arrange the 10th row, the 14th row eighth row fuel assembly 8 beam control rods;
G1 groups include corresponding 4th row eighth row, the 8th respectively and arrange the 4th row, and the 8th arranges the 12nd row, the fuel stack of the 12nd row eighth row 4 beam control rods of part;
G2 groups include respectively correspond to the 4th arrange the 6th row, the 4th arrange the 10th row, the 6th arrange the 4th row, the 6th arrange the 12nd row, the 10th row 4th row, the 10th arrange the 12nd row, the 12nd arrange the 6th row, the 12nd arrange the 10th row fuel assembly 8 beam control rods;
N1 groups include corresponding to the 4th respectively and arrange the 4th row, the 4th arrange the 12nd row, the 6th row eighth row, the 8th arrange the 6th row, the 8th arrange the 10 rows, the 10th row eighth row, the 12nd arrange the 4th row, the 12nd arrange the 12nd row fuel assembly 8 beam control rods;
N2 groups include respectively correspond to the 2nd arrange the 6th row, the 2nd arrange the 10th row, the 6th arrange the 2nd row, the 6th arrange the 14th row, the 10th row 2nd row, the 10th arrange the 14th row, the 15th arrange the 6th row, the 15th arrange the 10th row fuel assembly 8 beam control rods;
SA groups include corresponding to the 3rd respectively and arrange the 5th row, the 3rd arrange the 11st row, the 5th arrange the 3rd row, the 5th arrange the 13rd row, the 8th arrange the 8 rows, the 11st arrange the 3rd row, the 11st arrange the 13rd row, the 13rd arrange the 5th row, the 13rd arrange the 11st row fuel assembly 9 beam control rods;
SB groups include corresponding to the 3rd respectively and arrange the 7th row, the 3rd arrange the 9th row, the 7th arrange the 3rd row, the 7th arrange the 13rd row, the 9th arrange the 3rd Row, the 9th arrange the 13rd row, the 13rd arrange the 7th row, and the 3rd arranges 8 beam control rods of the fuel assembly of the 9th row;
SC groups include corresponding to the 5th respectively and arrange the 5th row, the 5th arrange the 11st row, the 7th arrange the 7th row, the 7th arrange the 9th row, the 9th arrange the 7th Row, the 9th arrange the 9th row, the 11st arrange the 5th row, the 11st arrange the 11st row fuel assembly 8 beam control rods;
G1 groups and G2 groups control bar construction by grey body, remaining group controls bar construction by black matrix.
In the present embodiment, set by the quantity to temperature regulating rod, power back-off stick and shut-down rod, temperature is adjusted Stick, power back-off stick and shut-down rod are rationally grouped, and the spatial position of each control rod is optimized, and are realized and are being adopted With 61 beam control rods(Control rod quantity is identical with 157 reactor cores, and the present invention is without increasing control rod quantity)In the case of, it is 177 Reactor core provides enough Shutdown margins, and Shutdown margin, which meets, to reload and demand for security that 18 months reload in year.
Meanwhile the present invention is identical with the control rod quantity used in 157 reactor cores, from without increasing on pressure vessels top cover The number of openings, the structural reliability for avoiding pressure vessel are damaged, and ensure that the structural reliability of pressure vessel.
Embodiment 2:
As shown in Figures 2 and 3, the present embodiment is on the basis of embodiment 1, per Shu Suoshu grey bodies control rod by 12 Gen Yin- Indium-Cd uptake stick and 12 stainless steel bar compositions.
Compared with the grey body control rod used in 157 reactor cores, silver-indium-Cd uptake stick in the grey body control rod of the present embodiment Quantity increases to 12 by 8, further improves the reactive control ability to 177 reactor cores.
Embodiment 3:
The present embodiment is in the technology of any one above-mentioned embodiment, per Shu Suoshu black matrixes control rod by 24 Gen Yin-indium-cadmium Absorbing rod forms.
Embodiment 4:
As shown in Fig. 2, the present embodiment is on the basis of embodiment 2, and in the grey body control rod, 12 silver-indium-cadmiums Absorbing rod corresponds to the 3rd row foundation frame, the 6th lattice of the 6th row, the 6th row foundation frame, the 12nd lattice of the 6th row, the 9th respectively in the grid of 17*17 The 3rd lattice of row, the 6th lattice of the 9th row, the 12nd lattice of the 9th row, the 15th lattice of the 9th row, the 6th lattice of the 12nd row, the 12nd row foundation frame, the 12nd row the 12nd Lattice, the 15th row foundation frame;
In the grey body control rod, 12 stainless steel bars correspond to the 6th lattice of the 3rd row respectively in the grid of 17*17, the The 12nd lattice of 3 rows, the 4th lattice of the 4th row, the 14th lattice of the 4th row, the 3rd lattice of the 6th row, the 15th lattice of the 6th row, the 3rd lattice of the 12nd row, the 12nd row 15 lattice, the 4th lattice of the 14th row, the 14th lattice of the 14th row, the 6th lattice of the 15th row, the 12nd lattice of the 15th row.
In addition to this it is possible to using arrangement shown in Fig. 3, in the grey body control rod, 12 silver-indiums- Cd uptake stick corresponded to respectively in the grid of 17*17 the 3rd row the 6th lattice, the 12nd lattice of the 3rd row, the 3rd lattice of the 6th row, the 6th row foundation frame, The 15th lattice of 6th row, the 6th lattice of the 9th row, the 12nd lattice of the 9th row, the 3rd lattice of the 12nd row, the 12nd row foundation frame, the 15th lattice of the 12nd row, the 15th The 6th lattice of row, the 12nd lattice of the 15th row;
In the grey body control rod, 12 stainless steel bars in the grid of 17*17 respectively correspond to the 3rd row foundation frame, The 4th lattice of 4th row, the 14th lattice of the 4th row, the 6th lattice of the 6th row, the 12nd lattice of the 6th row, the 3rd lattice of the 9th row, the 15th lattice of the 9th row, the 12nd row 5 lattice, the 12nd lattice of the 12nd row, the 4th lattice of the 14th row, the 14th lattice of the 14th row, the 15th row foundation frame.
In the present embodiment, by being closed to the spatial position of silver-indium-Cd uptake stick and stainless steel bar in grey body control rod Removing the work is put, and further improves the reactive control ability of grey body control rod.
It should be noted that in the grid of 17*17, grid corresponds to the fuel rod in fuel assembly.
As described above, it can preferably realize the present invention.

Claims (1)

1. a kind of control rod distributed architecture of 177 reactor core, it is characterised in that:
Including 61 beam control rods;
61 beam control rods are divided into 8 groups, are respectively R groups, G1 groups, G2 groups, N1 groups, N2 groups, SA groups, SB groups and SC groups;
Wherein, R groups are temperature regulating rod, and G1 groups, G2 groups, N1 groups and N2 groups are power back-off stick, and SA groups, SB groups and SC groups are Shut-down rod;
R groups include respectively correspond to the 2nd row eighth row, the 6th arrange the 6th row, the 6th arrange the 10th row, the 8th arrange the 2nd row, the 8th arrange the 14th row, 10th arrange the 6th row, the 10th arrange the 10th row, the 14th row eighth row fuel assembly 8 beam control rods;
G1 groups include corresponding to the 4th row eighth row respectively, the 8th arrange the 4th row, and the 8th arranges the fuel assembly of the 12nd row, the 12nd row eighth row 4 beam control rods;
G2 groups include corresponding to the 4th respectively and arrange the 6th row, the 4th arrange the 10th row, the 6th arrange the 4th row, the 6th arrange the 12nd row, the 10th arrange the 4th Row, the 10th arrange the 12nd row, the 12nd arrange the 6th row, the 12nd arrange the 10th row fuel assembly 8 beam control rods;
N1 groups include respectively correspond to the 4th arrange the 4th row, the 4th arrange the 12nd row, the 6th row eighth row, the 8th arrange the 6th row, the 8th arrange the 10th row, 10th row eighth row, the 12nd arrange the 4th row, the 12nd arrange the 12nd row fuel assembly 8 beam control rods;
N2 groups include corresponding to the 2nd respectively and arrange the 6th row, the 2nd arrange the 10th row, the 6th arrange the 2nd row, the 6th arrange the 14th row, the 10th arrange the 2nd Row, the 10th arrange the 14th row, the 15th arrange the 6th row, the 15th arrange the 10th row fuel assembly 8 beam control rods;
SA groups include respectively correspond to the 3rd arrange the 5th row, the 3rd arrange the 11st row, the 5th arrange the 3rd row, the 5th arrange the 13rd row, the 8th row eighth row, 11st arrange the 3rd row, the 11st arrange the 13rd row, the 13rd arrange the 5th row, the 13rd arrange the 11st row fuel assembly 9 beam control rods;
SB groups include respectively correspond to the 3rd arrange the 7th row, the 3rd arrange the 9th row, the 7th arrange the 3rd row, the 7th arrange the 13rd row, the 9th arrange the 3rd row, 9th arranges the 13rd row, the 13rd arranges the 7th row, and the 3rd arranges 8 beam control rods of the fuel assembly of the 9th row;
SC groups include respectively correspond to the 5th arrange the 5th row, the 5th arrange the 11st row, the 7th arrange the 7th row, the 7th arrange the 9th row, the 9th arrange the 7th row, 9th arrange the 9th row, the 11st arrange the 5th row, the 11st arrange the 11st row fuel assembly 8 beam control rods;
G1 groups and G2 groups control bar construction by grey body, remaining group controls bar construction by black matrix;
It is made of per Shu Suoshu grey bodies control rod 12 Gen Yin-indium-Cd uptake stick and 12 stainless steel bars;
It is made of per Shu Suoshu black matrixes control rod 24 Gen Yin-indium-Cd uptake stick;
In the grey body control rod, 12 silver-indium-Cd uptake sticks in the grid of 17*17 respectively correspond to the 3rd row foundation frame, The 6th lattice of 6th row, the 6th row foundation frame, the 12nd lattice of the 6th row, the 3rd lattice of the 9th row, the 6th lattice of the 9th row, the 12nd lattice of the 9th row, the 9th row the 15th Lattice, the 6th lattice of the 12nd row, the 12nd row foundation frame, the 12nd lattice of the 12nd row, the 15th row foundation frame;
In the grey body control rod, 12 stainless steel bars correspond to the 6th lattice of the 3rd row, the 3rd row respectively in the grid of 17*17 12nd lattice, the 4th lattice of the 4th row, the 14th lattice of the 4th row, the 3rd lattice of the 6th row, the 15th lattice of the 6th row, the 3rd lattice of the 12nd row, the 12nd row the 15th Lattice, the 4th lattice of the 14th row, the 14th lattice of the 14th row, the 6th lattice of the 15th row, the 12nd lattice of the 15th row.
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