Document: NUREG-0800
Document ID: c766e34e-6ea5-45e7-9123-75964d118447
Document Type: srp
Title: REACTOR CORE ISOLATION COOLING SYSTEM (BWR)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070540102.pdf
Revision Date: 2023-06
Chapter: 5
Section ID: 5.4.6
CFR Part: 
CFR Title: 

Content:
piping systems penetrating primary reactor containment shall be provided with leak detection, isolation, and containment capabilities having redundancy, reliability, and performance capabilities that reflect the importance to safety of isolating these piping systems. The design of such piping systems must have the capability to test periodically the operability of the isolation valves and associated apparatus and to determine whether valve leakage is within acceptable limits. Piping in the RCIC system passes through the containment boundary and is provided with isolation valves and integrity verification capabilities. Containment isolation and leak detection, as required by GDC 54, provide reasonable assurance that the containment will perform its safety function in the event of a postulated accident and will maintain the capability to prevent a significant uncontrolled release of radioactivity. 7. 10 CFR 50.63 imposes explicit requirements on LWRs regarding the plant’s ability to withstand for a specified duration and recover from an SBO. 10 CFR 50.63(b), in particular, requires that the reactor core and associated coolant, control and protection systems must provide sufficient capacity and capability to ensure that the core is cooled and appropriate containment integrity is maintained in the event of an SBO for the specified duration. The RCIC system provides decay heat removal from the reactor core. Its design capability to operate regardless of ac power source availability enables performance of the decay heat removal function to support the plant in coping with an SBO. Regulatory Guide 1.155 identifies acceptable methods for complying with the requirements of 10 CFR 50.63. Compliance with 10 CFR 50.63 provides reasonable assurance that the RCIC system is capable of performing its intended function if an SBO occurs. III. REVIEW PROCEDURES The reviewer will select material from the procedures described below, as may be appropriate for a particular case.