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:
vent controls, and power source to establish that a single failure will not prevent isolation of the vent system. 3. RSB examines valve redundancy and other methods to minimize inadvertent actuation. Comparisons of the methods to prevent inadvertent actuation should be made with other safety-related systems. 4. MTEB evaluates the vent system to determine that all requirements for the reactor pressure boundary are met. 5. RSB examines the size of the vent line and orifices to see that they are smaller than the LOCA definition. If vent path capacity is of LOCA size, a LOCA analysis shall be provided. 5.4.12-4 Rev. 0 - July 1981 6. RSB determines that the areas of discharge for the vent system are capable of withstanding all substances which may be vented. In addition CSB examines these areas to see that adequate mixing with the containment atmosphere is provided. 7. RSB examines the description and P&IDs to assure that the vents are operable from the control room and that power is supplied from emergency ency buses. 8. HFEB determines that the displays and controls added to the control room as a result of this requirement do not increase the potential for operator error. A human-factor analysis will be evaluated 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. 9. PRTB 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. EQB reviews the reactor coolant vent system (i.e., vent valves, block valves, position indication devices, cable terminations, and piping) to assure that it is seismically and environmentally qualified in accordance with IEEE 344-1975 as supplemented by Regulatory Guide 1.100,