Document: NUREG-0800
Document ID: 7b4fb774-803a-419c-bdec-3b31c351a3fe
Document Type: srp
Title: REACTOR COOLANT PRESSURE BOUNDARY LEAKAGE DETECTION
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0706/ML070610277.pdf
Revision Date: 2023-06
Chapter: 5
Section ID: 5.2.5
CFR Part: 
CFR Title: 

Content:
Upon request from the primary reviewer, the coordinating reviewers provide input for the areas of review stated in subsection I of this SRP section. The primary reviewer uses such input as required to complete the review procedures. 1. The reviewer verifies whether identified leakage is collected in tanks or sumps where its rate of accumulation is monitored for an identified leak rate. The reviewer should establish whether the leakage is collected and monitored to prevent it from masking unidentified leaks. 2. The reviewer verifies whether the provisions for collecting, detecting, and monitoring unidentified leakage are separate from those for identified leakage. The floor drainage system is reviewed for whether such leakage flows readily to the sump or tank for collection and is not held up in any "reservoirs." The containment air coolers are reviewed for whether leakage from "hot" systems flashing into water vapor is condensed readily and whether the condensate flows directly to the sump. 5.2.5-5 Revision 2 - March 2007 3. The reviewer determines whether the applicant identifies all potential inter-system leakage paths and whether the instrumentation for each path is appropriate and adequate for positive indication of inter-system leakage in the affected system and provides adequate monitoring capability so that the limits assumed in the accident analyses are not exceeded. Inter-system leak detection methods include radioactivity, pressure, temperature, flow and pressure relief valve actuation indications, and the water inventory balance method. Table I shows some of the systems that need inter-system leakage monitoring. 4. The reviewer verifies whether the leakage detection systems remain functional for all seismic events not requiring a shutdown and whether the airborne particulate radioactivity monitoring system remains functional when subjected to a safe shutdown earthquake. 5. The reviewer verifies whether all leakage detection systems have readouts in the