核电机组辅助给水系统水温超运行技术规范限值的改造研究

针对夏季高温天气下，辅助给水系统（ASG）水温超过运行技术规范限值而导致机组后撤的问题，提出了对辅助给水贮水箱（ASG001BA）加装热交换器的改造方案，从工艺设计、仪控修改和运行控制角度进行了详细分析和论证。机组实践表明，在蒸汽发生器冷却正常停堆模式下，本文提出的改造方案保证了ASG001BA的水位和水温在运行技术规范要求的范围内，保证了机组安全经济的运行。本文的研究对机组大修优化、提升机组核安全水平具有参考价值。 

Study on Modification for Auxiliary Feed Water System Temperature Beyond the Limit in Operation Technical Specification of Nuclear Power Units

For the unit fallback case in which the water temperature of Auxiliary Water Supply System exceeds the temperature limit in the Operation Technical Specification due to the minimum flowrate operation in Summer, the modification of installing a cooler on the line of the circulation pump for ASG tank are proposed, and the process design, changes in instrument and control system and operation control are investigated. The results show that with the modification, the water level and temperature can be maintained within the limits of OTS, and the units can operate in a safe and economic mode. The research of this paper is with a reference value for nuclear safety improvement and outage optimization.