Document: NUREG-0800
Document ID: 1c401e6c-8c2d-47df-b05f-2978939cbd15
Document Type: srp
Title: CONTROL ROOM HABITABILITY SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550069.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6.4
CFR Part: 
CFR Title: 

Content:
ubject to failure. B. External valve components (i.e., components including motors and power supplies that are to be assumed repairable or removable) should be designed to ensure that the failed valve component can be bypassed easily and safely and that the valve can be manipulated into an acceptable position. The electronic components should be isolated from other equipment to ensure that the repair operations do not result in further equipment failure. 2. The location and positioning of the valve or damper should permit easy access from the control room for convenient repair, especially under applicable DBA conditions. 3. Appropriate control room instrumentation should be provided for a clear indication and annunciation of valve or damper malfunction. 6.4-21 Revision 3 - March 2007 4. Periodic manipulation of the valve or damper by control room operators should be required for training purposes and also to verify proper manual operability of the valve or damper. 5. The need for manual manipulations of the failed valve or damper should not be recurrent during the course of the accident. Manipulation should not occur more than once during the accident. Adjustment or realignment of other parts of the system should be possible from the control room with the failed valve in a fixed position. 6. The time for repair used in the computation of control room exposures should be taken as the time necessary to repair the valve plus a one-half hour margin. No manual correction will be credited during the first two hours of the accident. 7. Compliance with the above criteria should be documented in the SAR whenever the repair option is used.