摘要
针对AP1000机组一回路除氧的困难,提出采用脱气塔+EHT(流出液暂存箱)自循环、低压加氢催化除氧补给水上充下泄稀释,组合化学除氧的应对策略。同时对传统化学/物理除氧的制约因素优化,如制定机组启动时的一回路抽真空度验收标准、采用总气体含量测量对静动排气的效果验收、优化联氨添加量、优化联氨添加时机、优化化学除氧温度平台、采用联氨定性的快速检测方法、优化联氨添加方式、联氨泄漏判断、取样监测频率、热力除氧与氮气覆盖等。开发出一套除氧方法,有效解决了AP1000机组启动的一回路除氧问题,将热试除氧时间从西屋公司主导的70h降至12h,并成功实现在酸性条件、无辐照环境下除氧的最佳纪录。本文为国内外首次对一回路除氧开发和采用脱气塔+EHT自循环的预物理除氧方法、首次采用低压加氢催化除氧补给水上充下泄稀释降低氧含量的方法,为国内首次采用总气体含量测量量化评估一回路静动排气效果,为后续项目试验提供经验和参考。
This paper analyzes deoxygenization problems in AP1000 and proposes the countermeasures by using the pre-physical deaeration method by degasifier column and EHT circulating,using low-pressure hydrogenation catalytic deaerated water to make up for the RCS(reactor coolant system)in order to dilute the oxygen,and combing with chemical oxygen removal method.In addition,the factors that affecting traditional chemical/physical deoxygenization are optimized,such as setting the primary circuit vacuum acceptance criteria during startup,and the total gas limits for the static exhausting.Making some optimizations such as the hydrazine addition amount,the timing of hydrazine addition and temperature,innovating rapid detection method for hydrazine,making optimizations of hydrazine addition method,hydration leakage judgment,sampling frequency,thermal deaeration and nitrogen coverage deaeration,etc.Finally,an effective deoxygenization method was developed for the primary circuit of AP1000 unit during startup.The deoxygenization time which was dominated by Westinghouse was 70 h in the hot function test,reduced to 12 h,and successfully achieved the best record of deoxygenization practices under acidic conditions without irradiation.This is the first time at home and abroad to develop and adopt the pre-physical deaeration method of degasifier column and EHT self-circulation,the first time using lowpressure hydrogen catalytic deaerated water makeup to reduce the oxygen content in the water,the first time using the total gas to evaluate the primary circuit dynamic venting effect,which provide experience and reference for subsequent projects.
作者
侯涛
孟宪波
范赏
姜磊
吴旭东
HOU Tao;MENG Xianbo;FAN Shang;JIANG Lei;WU Xudong(Sanmen Nuclear Power Co.,Ltd.,Sanmen of Zhejiang Prov.317112,China)
出处
《核科学与工程》
CAS
CSCD
北大核心
2021年第2期253-264,共12页
Nuclear Science and Engineering
关键词
三门核电
AP1000
一回路除氧
脱气塔
联氨
Sanmen nuclear power plant
AP1000
The primary deaeration
Degasifier column
Hydrazine
