Document: NUREG-0800
Document ID: 16922d4c-3f36-4add-8a31-0ec35a44f030
Document Type: srp
Title: REACTOR COOLANT SYSTEM HIGH POINT VENTS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0707/ML070770005.pdf
Revision Date: 2023-06
Chapter: 5
Section ID: 5.4.12
CFR Part: 
CFR Title: 

Content:
pressurizer venting, an inadvertent valve opening or failure would initiate a LOCA. However, the path also contains a block valve, and this LOCA should have been addressed as part of the 10 CRF 50.46 assessment. In this case, the reviewer will assess the licensee’s treatment of the LOCA and will request that the reviewers of instrumentation and control systems, and human performance assess the capability of closing the block valve under the LOCA conditions. 6. The organization responsible for mechanical engineering determines that the areas of discharge for the vent system are capable of withstanding all substances that may be vented. In addition, the organization responsible for the review of containment integrity examines these areas to verify that adequate mixing with the containment atmosphere is provided. 7. The organization responsible for electrical engineering reviews examines the description and piping and instrumentation diagrams to assure that the vents are operable from the control room and that power is supplied from emergency buses. 8. The organization responsible for the review of human performance determines that the control room displays and controls for the RCS vent system do not increase the potential for operator error. 9. The organization responsible for mechanical engineering reviews examines provisions to test for operability of the reactor coolant vent system. Testing should be performed in accordance with Subsection IWV of Section XI of the ASME Code for Category B valves. 10. The organization responsible for mechanical engineering reviews, examines the reactor coolant vent system (i.e., vent valves, block valves, position indication devices, cable terminations, and piping) to assure that it is seismically qualified in accordance with IEEE 344, as supplemented by Regulatory Guide 1.100, and Regulatory Guide 1.92. 11. The organization responsible for environmental qualification review (i.e., vent valves, block valves, position indication