Document: NUREG-0800
Document ID: 7c10e1ce-ce1f-4c5c-8b11-53db665b85f4
Document Type: srp
Title: REACTOR COOLANT SYSTEM HIGH POINT VENTS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340642.pdf
Revision Date: 2023-06
Chapter: 5
Section ID: 5.4.12
CFR Part: 
CFR Title: 

Content:
REVIEW RESPONSIBILITIES Primary - Reactor Systems Branch (RSB) Secondary - None I. AREAS OF REVIEW Reactor coolant system high point vents are provided to exhaust noncondensible gases from the primary system that could inhibit natural circulation core cooling. The vent system consists of remotely operated valves at high points in the reactor coolant system to vent gases from the primary system into containment. Since the vents form part of the reactor coolant pressure boundary, design of the vent system shall conform to the requirements of Appendix A to 10 CFR Part 50, "General Design Criteria." In addition, the vent system shall be designed with sufficient redun- dancy to assure a low probability of inadvertent or irreversible actuation. The vent system's safety function may be required to maintain core coolability following an accident, therefore the system is designed as a safety-related system. RSB review of reactor coolant system high point vents will include the following specific areas: 1. The location, size, discharge capacity, functions, and discharge area(s) of the vent system. 2. Supporting LOCA analyses for breaks in the vent line to demonstrate com- pliance with 10 CFR Part 50, §50.46. 3. Redundancy and failure modes of the valve train. 4. Procedures for using and not using the vent system, and the bases for these procedures. 5. Information available to the operator for initiating and terminating vent system operation. Rev. 0 - July 1981 USNRC STANDARD REVIEW PLAN Standard review plans are prepared for the guidance of the Office of Nuclear Reactor Regulation staff responsible for the review of applications to construct and operate nuclear power plants. These documents are made available to the public as part of the Commission's policy to Inform the nuclear Industry and the general public of regulatory procedures and policies. Standard review plans are not substitutes for regulatory guides or the Commission's regulations and compliance with them Is not