CAP1400一体化堆顶组件冷却系统通风数值研究

Numerical Research of CAP1400 IHP Cooling System

摘要: 反应堆一体化堆顶组件(IHP)的主要功能之一是为控制棒驱动机构(CRDM)的磁轭线圈提供冷却，冷却风源是连接在一体化堆顶组件围筒的通风管上的轴流风机，在正常运行工况下，4个风机中的2个处于工作状态。为了保证CRDM的正常运行，规范书要求磁轭线圈温度应当低于200°C。这一要求通过保证CRDM磁轭线圈部件外的平均流速在15 m/s以上、磁轭线圈部件外表面任何位置的最小风速不小于9 m/s来实现。本文的目的是研究IHP冷却系统在各种风机运行条件下的流动特性，采用CFD方法计算得到IHP内的流场和温度场，为验证IHP设计合理性提供支持。

Abstract: One of the main functions of the Integrated Head Package (IHP) in the reactor is to provide cooling for the Control Rod Drive Mechanism (CRDM) magnetic coils. This is realized by the four axial fans connected to the ventilation tubes of the CRDM cooling shroud. Under normal operation condition, only two of the four fans work. It is required that the IHP cooling system should keep the magnetic coil temperature below 200˚C in the design specification. This is achieved by ensuring that the average flow velocity around the CRDM coil assembly is above 15 m/s and that the minimum flow velocity at any location on the outer surface of the coil assembly is not less than 9 m/s. The main purpose of this paper is to study the flow characteristics of the IHP cooling system under various operating conditions. The CFD method is used to obtain the flow field and temperature field in the IHP and to support the rationality of the IHP design.