Document: NUREG-0800
Document ID: fa6f6a6f-6b58-4b9d-bff6-146879b1bdbf
Document Type: srp
Title: REACTOR COOLANT PRESSURE BOUNDARY LEAKAGE DETECTION
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340605.pdf
Revision Date: 2023-06
Chapter: 5
Section ID: 5.2.5
CFR Part: 
CFR Title: 

Content:
determine leak rates are adequate. 7. The reviewer determines that the radiation monitoring systems have a radioactive source built into the system (the SAR refers to this feature as a "check source") to permit operability testing and cali- bration during operation. The reviewer determines that provisions are made to test and calibrate the sump level detection system. He also determines that a method for calibrating the air cooler conden- sate flow system exists, wherever the radiation monitors are used, and that a method to calibrate them to RCPB leakage exists. The frequency of testing and calibration should be provided and justified. The reviewer also determines that periodic testing of the floor drainage system will be performed to check for blockage and ensure operability. IV. EVALUATION FINDINGS The reviewer verifies that sufficient information has been provided and his review supports conclusions of the following type, to be included in the staff's safety evaluation report: The reactor coolant pressure boundary (RCPB) leakage detection system provides reliable monitoring of reactor coolant leakage from compo- nents of the reactor coolant pressure boundary by the use of combina- tions of atmospheric particulate monitors, radiogas monitors, level indicators and pressure, humidity and temperature indicators. The leakage detection systems provided to detect leakage from compo- nents of the reactor coolant pressure boundary furnish reasonable assurance that structural degradation, which may develop in pressure- retaining components of the RCPB and result in coolant leakage during service, will be detected on a timely basis, so that corrective actions can be made before such degradation could become sufficiently severe to jeopardize the safety of the system, or before the leakage could increase to a level beyond the capability of the makeup system to replenish the coolant loss. The staff concludes that the design of the RCPB leakage detection systems is acceptable