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:
pplication are contained in the SRP sections identified as the primary review responsibility of those branches. II. ACCEPTANCE CRITERIA The objective of the review is to determine that the vent system is capable of removing noncondensible gases from the primary coolant system with a minimal probability of inadvertent or spurious actuation. RSB acceptance criteria are based on meeting the relevant requirements of the following regulations: A. 10 CFR Part 50, §50.55a and General Design Criteria l and 30 as they relate to the vent system components which are part of the reactor coolant pressure boundary being designed, fabricated, erected, and tested and maintained to high quality standards. 5.4.12-2 Rev. 0 - July 1981 B. General Design Criterion 14, as it relates to the reactor coolant pressure boundary being designed, fabricated, erected and tested to have an extremely low probability of abnormal leakage, of rapidly propagating failure, and of gross rupture. C. 10 CFR Part 50, §50.46(b) as it relates to the long-term cooling of the core following any calculated successful initial operation of the ECCS to remove decay heat for an extended period of time. Specific criteria necessary to meet the regulations identified above and necessary to implement task action plan Item II.B.1 of NUREG-0718 and -0737 are as follows: 1. Vent paths shall be provided on high points of the reactor coolant system (including the pressurizer on PWRs) to vent gases which may inhibit core cooling. For reactors with U-tube steam generators, procedures shall be developed to remove gases from the U-tubes since it is impractical to individually vent the thousands of U-tubes. 2. A single failure of a vent valve, power supply, or control system shall not prevent isolation of the vent path. On BWRs, block valves are not required in lines with safety valves used for venting. 3. Sufficient redundancy in the design shall be incorporated to minimize the probability of inadvertent actuation. Other