M310机组蒸汽发生器传热管5%破损率量化研究

何风; 朱建平; 卢岳川; 卢喜丰; 王新军; 李晓

doi:10.13832/j.jnpe.2022.04.0191

M310机组蒸汽发生器传热管5%破损率量化研究

doi: 10.13832/j.jnpe.2022.04.0191

中国核动力研究设计院核反应堆系统设计技术重点实验室，成都，610213

详细信息

作者简介:
何　风（1984—），男，高级工程师，主要从事反应堆结构力学方面的工作，E-mail: hefeng_work@163.com

中图分类号: TL38⁺2
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出版历程
- 收稿日期: 2021-05-19
- 修回日期: 2022-04-26
- 刊出日期: 2022-08-04

Quantitative Study on 5% Damage Rate of Steam Generator Heat Transfer Tube in M310 Unit

Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu, 610213, China

摘要

摘要: M310核电机组《化学和放射化学技术规范》第3篇《放射化学规范》中规定，当“¹³³Xe>92500 MBq/t或¹³³Xe>37000 MBq/t和¹³¹I/¹³³I>1.5”时，执行“如果至少1台蒸汽发生器（SG）传热管破损率超过5%，则应以50 MW/min 速率降负荷到NS/SG模式”指令。在实际运行过程中，由于无法判断传热管破损率是否超过5%，故无法确定是否执行“以50 MW/min 速率降负荷到NS/SG模式”的指令，因此，M310核电机组《放射化学规范》中该运行指令不具备可操作性。本文对国内外相关放射化学运行指令进行调研，充分理解“传热管破损率超过5%”的含义，并进行量化分析。通过对SG传热管在5、24、44 L/h泄漏率下的裂纹稳定性进行分析，发现在这些泄漏率下单根传热管都不会发生失稳断裂，进而给出了一个具有可操作性的建议，用指标“如果至少1台SG一次侧向二次侧的泄漏率超过5 L/h”，代替无法量化的“如果至少一台SG传热管破损率超过5%”，可保证核电厂运行的安全性和经济性。
- M310机组 /
- 传热管 /
- 破损率 /
- 泄漏率 /
- 贯穿裂纹
Abstract: For M310 nuclear power unit, Part 3 ( Radiochemistry Code ) of the Technical Specification of Chemistry and Radiochemistry specifies that when “¹³³Xe>92500 MBq/t or ¹³³Xe>37000 MBq/t and ¹³¹I/¹³³I>1.5”, execute the command "if the damage rate of heat transfer tube of at least one steam generator (SG) exceeds 5%, reduce the load to NS/SG mode at the rate of 50 mw/min". However, in the actual operation process, since it is impossible to judge whether the damage rate of SG tube exceeds 5%, it is impossible to determine whether to execute the instruction of "reducing the load to NS/SG mode at a rate of 50 MW/min". Therefore, for M310 nuclear power unit, the operation instruction in the Radiochemistry Code is not operable. This paper investigates the relevant radiochemistry operation instructions at home and abroad, fully understands the meaning of "the damage rate of heat transfer tubes exceeds 5%”, and makes quantitative analysis. Through the analysis of the crack stability of the SG heat transfer tube under the leakage rate of 5, 24, 44 L/h, it is found that the unstable fracture of a single heat transfer tube will not occur at these leak rates, and then an operational suggestion is given: using the indicator "If the leak rate of at least one SG from the primary side to the secondary side exceeds 5 L/h" instead of the unquantifiable "If the damage rate of at least one SG heat transfer tube exceeds 5%", the safety and economy of nuclear power plant operation can be ensured.
- M310 unit /
- Heat transfer tube /
- Damage rate /
- Leak rate /
- Through-wall crack

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表 1 SG传热管相关参数

Table 1. SG Heat Transfer Tube Related Parameters

外径/mm	壁厚/mm	材料牌号	压力/MPa		运行温度/℃
外径/mm	壁厚/mm	材料牌号	一次侧	二次侧	一次侧	二次侧
19.05	1.05	NC30Fe （相当于Inconl-690）	15.5	6.79	310	283.78

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表 2 各泄漏率下单根传热管的泄漏裂纹长度和临界裂纹长度

Table 2. Leakage Crack Length and Critical Crack Length of a Single Heat Transfer Tube at Various Leak Rates

泄漏率/（L·h⁻¹ ）	工况序号	压力/MPa		环向贯穿裂纹长度/mm		纵向贯穿裂纹长度/mm
泄漏率/（L·h⁻¹ ）	工况序号	一次侧	二次侧	泄漏裂纹	临界裂纹	泄漏裂纹	临界裂纹
5	1	15.50	6.79	11.94	24.07	6.44	27.00
5	2	15.50	0.10	8.77	16.39	4.42	14.60
24	1	15.50	6.79	16.53	24.07	8.89	27.00
24	2	15.50	0.10	12.87	16.39	6.22	14.60
44	1	15.50	6.79	18.57	24.07	10.03	27.00
44	2	15.50	0.10	14.69	16.39	7.03	14.60

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参考文献(11)

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