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化学和容控系统


UNIT 18 CHEMICAL AND VOLUME CONTROL SYSTEM
化学和容控系统
1.      The chemical and volume control system functions to maintain the coolant inventory, to control the coolant chemistry and to adjust the boron concentration of the reactor coolant system.
   化容系统的功能:维持主系统的水装量,控制主冷却剂的化学性能和调节主系统的硼浓度。
2.      During normal operation, reactor coolant flows through the letdown line from one of reactor coolant cold legs, is processed and then returned to the same cold leg through charging line.
   正常运行时,从一个主管道的冷段引出下泄流,经过处理后,通过上充管线返回注入到相同的冷段管道。
  1. The regenerative heat exchanger provides the initial cooling of the letdown fluid by preheating the returning charging stream and the letdown orifice(s) control the amount of coolant that is letdown (removed) from the reactor coolant system and provides the initial pressure reduction of this high pressure fluid.
预热上充流的过程,使得再生热交换器给下泄流提供了最初的冷却。下泄节流孔板控制从主系统流出的流量,同时它也给提供了下泄流的初始压降。
  
4.      The letdown heat exchanger reduces letdown fluid temperature to a value that is compatible with the ion exchanger resin.
   下泄热交换器将流体的温度降到合适的定值,这个温度下,净化床工作允许。
5.      The letdown back-pressure regulating valve maintains pressure in the section of letdown upstream or the letdown heat exchanger to prevent the letdown liquid flashing to steam.
   下泄背压控制阀维持下泄流上游段或下泄热交换器处的压力,防止压力过低引起流体汽化。
6.      The letdown ion exchangers (demineralizers) are designed to remove ionic impurities from the reactor coolant.
   净化床的作用是除去冷却中的离子态的杂质。
  1. All of the ion exchanger resins are temperature sensitive; therefore, a temperature diver valve bypasses letdown flow if the letdown heat exchanger outlet temperature rises to a predetermined value.
所有的树脂床对温度都有要求,因此当温度超过预定值时,下泄流将旁通净化床运行。
  
8.      The volume control tank collects the purified, filtered letdown fluid and provides a suction reservoir and head for the charging pumps.
   容控箱收集净化、过滤后的下泄流,同时它给上充泵提供净正吸入压头。
9.      The charging system contains three pumps: two redundant centrifugal charging pumps and a positive displacement pump.
   上充系统有三台泵:两台互为备用的离心上充泵和一台往复式上充泵。
10.  In addition to the charging function, the centrifugal pumps also serve as the high head safety injection pumps during emergency core cooling system operation.
   除了上充功能,应急堆芯冷却系统运行时,离心上充泵用作高压安注的一部分。
11.  The reactor coolant makeup system provides a method of supplying concentrated boric acid, demineralized reactor makeup water or a mixture of both, to the volume control tank or the charging pump suction head.
   反应堆补给水系统提供浓硼酸,除盐水或是两者混合的液体,注入点为容控箱或上充泵吸入口。
12.The chemical addition system allows the addition of lithium hydroxide for pH control of the reactor coolant system and the addition of hydrazine for oxygen control when the reactor is a cold shutdown.
  化学添加系统用于向反应堆冷却剂系统添加LiO2以调节PH值,或是添加联氨用于在冷停堆的情况下除氧。

 

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