Document: NUREG-0800
Document ID: 591967ba-e3de-4621-8628-375311695d02
Document Type: srp
Title: REACTOR COOLANT PRESSURE BOUNDARY LEAKAGE DETECTION
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070422.pdf
Revision Date: 2023-06
Chapter: 5
Section ID: 5.2.5
CFR Part: 
CFR Title: 

Content:
at structures, systems, and components important to safety be designed to withstand the effects of natural phenomena, including earthquakes, without loss of capability to perform their intended safety functions. The RCPB Leakage Detection system detects leakage in the RCPB after the occurrence of an earthquake to provide an early indication of degradation so that corrective action can be taken before such degradation becomes sufficiently severe to cause a leak rate greater than the capability of the makeup system to replenish the coolant loss. Regulatory Guide 1.29 describes an acceptable method of identifying and classifying those portions of the system that should be designed to withstand the effects of an SSE. Application of GDC 2 and RG 1.29 to the RCPB leakage detection system assures that plant operators have the capability to detect and respond to RCPB leakage after the occurrence of an earthquake. The prompt detection of, and response to, leakage from the RCPB after an earthquake reduces the possibility of a severe loss of coolant accident. 2. GDC 30 establishes the requirement for a system to detect and, to the extent practical, identify the location of reactor coolant leakage. The RCPB Leakage Detection system provides the capability to detect and identify RCPB leakage. Regulatory Guide 1.45 describes acceptable methods for implementing the requirement established in GDC 30 with regard to the selection of leakage detection systems for the reactor coolant pressure boundary. Compliance with GDC 30 and RG 1.45 assures operators an early indication of RCPB degradation thus minimizing the likelihood that a leak in the RCPB may go undetected and result in a severe loss of coolant accident. DRAFT Rev. 2 - April 1996 5.2.5-4 III. REVIEW PROCEDURES The procedures below are used during the construction permit (CP) review to determine that the design criteria and bases and the preliminary design as set forth in the preliminary safety analysis report meet the