CHLORINE CONCENTRATION CONTROL OF FEED WATER FOR NUCLEAR POWER STATION

摘要

PURPOSE:To enable a prevention of streaming-in of a chlorine ion into a reactor core in case of an accident of sea water leakage by detecting the leakage of sea water into a condenser at an outlet of the condenser and controlling a valve installed at a by-pass system with the detection signal. CONSTITUTION:In case of a sea water (a coolant) leakage into a condenser 8, a conductivity meter 21 provided at an outlet of the condenser 8 detects the leaking, and receiving a detection signal, a regulating valve 22 for a by-pass flow rate installed at a by-pass piping 20 of a condensate purification facility is completely closed. By installing the regulating valve 22 at a periphery of a condensate filter 10, a stored amount of the condensate containing a chlorine ion can be minimized and therefore a demineralizing treatment can be easily conducted. An occurrence of a sea water leakage is judged by a fact whether the detection value is larger than 0.1mu/cm which is a conductivity controlling value, or not. In case that all the condensate passes through the filter 10 and a demineralizer 11 according to the aforementioned system configulation and an operating procedure, any chlorine ion do not enter a nuclear reactor 1 even if a sea water leakage might occur. Therefore, an integrity of constituted equipments can be maintained and a safe operation can be achieved.