Document: NUREG-0800
Document ID: 15a004f9-6c99-4bc0-a858-efeaea553e8e
Document Type: srp
Title: REACTOR COOLANT SYSTEM HIGH POINT VENTS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070440.pdf
Revision Date: 2023-06
Chapter: 5
Section ID: 5.4.12
CFR Part: 
CFR Title: 

Content:
g power or administrative controls, may be considered. 54. Since the reactor coolant system vent will be part of the reactor coolant system pressure boundary, all requirements for the reactor pressure boundary must be met. 65. The size of the vent line should be kept smaller than the size corresponding to the definition of a LOCA (10 CFR Part 50, Appendix A) to avoid unnecessary challenges to the ECCS. 5.4.12-5 DRAFT Rev. 1 - April 1996 76. Vent paths to the containment should discharge into areas that provide good mixing with containment air and are able to withstand steam, water, noncondensibles, and mixtures of the above. 87. The vent system shall be operable from the control room and provide positive valve position indication. Power shall be supplied from emergency buses. 98. It is important that the control room displays and controls for the RCS vents doadded to the control room as a result of this requirement not increase the potential for operator 37 error. A human-factor analysis should be performed taking into consideration: (a) the use of this information by an operator during both normal and abnormal plant conditions, (b) integration into emergency procedures, (c) integration into operator training, and (d) other alarms during emergency and need for prioritization of alarms. 109. Provisions to test for operability of the reactor coolant vent system should be a part of the design. Testing should be performed in accordance with subsection IWV of Section XI of the ASME Code (Reference 18) for Category B valves. 38 1110. The reactor coolant vent system (i.e., vent valves, block valves, position indication devices, cable terminations, and piping) shall be seismically and environmentally qualified in accordance with IEEE 344-1975 (Reference 19) as supplemented by 39 Regulatory Guide 1.100, and Regulatory Guide 1.92and SEP 3.92, 3.43, and 3.10. 40 41 Environmental qualifications are in accordance with the May 23, 1980 Commission Order and Memorandum