﻿ 船用堆温度不对称偏环路运行安全分析
 舰船科学技术  2021, Vol. 43 Issue (7): 78-81    DOI: 10.3404/j.issn.1672-7649.2021.07.016 PDF

Operational safety analysis of temperature asymmetry partial loop for marine reactor
ZHANG Xin, WANG Kun, YUAN Jiang-tao
Naval Submarine Academy, Qingdao 266199, China
Abstract: This article takes marine reactors as the research object and uses the RELAP5/MOD3.2 program to establish a one-dimensional system model to calculate and analyze the reactor temperature asymmetry partial loop operation caused by the steam generator feed-water failure. The calculation results show that: when the steam generator feed-water fails, the temperature difference between the inlet coolant of the reactor’s left and right loops will be greater than 10 ℃;when the steam generator maintains the feed-water flow rate of lea than 40%, the reactor temperature asymmetric partial loop operation will result in large fluctuations in the steam generator pressure and temperature of the abnormal loop, which is not conducive to the operation control and stability of the system.
Key words: RELAP5 program     security analysis     feed-water failure     marine reactor
0 引　言

1 模型建立

 图 1 小型压水堆系统控制体划分 Fig. 1 Division of control bodies of small PWR system
2 给水故障分析 2.1 稳态测试

2.2 温度不对称运行分析

 图 2 反应堆堆芯功率 Fig. 2 The core power of the reactor

 图 5 压力容器异常环路侧进口温度 Fig. 5 The inlet temperature of the abnormal loop side of the pressure vessel

 图 3 压力容器正常环路侧进口温度 Fig. 3 The inlet temperature of the normal loop side of the pressure vessel

 图 4 压力容器出口温度 Fig. 4 Outlet temperature of pressure vessel

 图 6 异常环路蒸汽发生器压力 Fig. 6 Pressure of abnormal loop steam generator

 图 7 异常环路蒸汽发生器水位 Fig. 7 Water level of abnormal loop steam generator

 图 8 稳压器内部压力 Fig. 8 The internal pressure of the pressurizer

 图 9 稳压器内部水位 Fig. 9 The internal water level of the pressurizer

3 结　语

1）蒸汽发生器给水故障且可维持的最大给水流量小于40%时，船用堆转换2条环路温度不对称运行过程中，异常环路的蒸汽发生器压力、温度会存在较大波动，不利于运行的控制和稳定。此时操作员应该及时切断异常环路实现单环路运行。

2）蒸汽发生器给水故障且可维持的最大给水流量为60%时，船用堆转换2条环路温度不对称运行过程中，压力容器左、右环路两进口冷却剂最大温差为9.27 ℃，与其余相关系统运行参数均满足安全运行限值要求，此时操作员可及时根据故障蒸汽发生器可维持的最大给水流量降低反应堆功率，实现温度不对称偏环路运行确保为航行提供最大动力。

3）蒸汽发生器给水故障，船用堆转换2条环路温度不对称运行时，操作员应注意反应堆功率的调节，密切关注异常环路蒸汽发生器压力、水位变化，防止出现超压。

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