Document: NRC Regulatory Guide
Document ID: 99fe445b-c440-4921-ba8f-841c8f236046
Document Type: regulatory_guide
Title: Nuclear Power Plant Instrumentation for Earthquakes + HISTORY - HISTORY 09/2016 – DG-1332 , Proposed Revision 3 04/2015 – Periodic Review on Revision 2 – Revise 02/1995 – DG-1033, Third Proposed Revision 2 11/1992 – DG-1016, Second Proposed Revision 2 07/1981 – Draft MS 140-5 , First Proposed Revision 2 (Rev. 3)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1610/ML16104A220.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.12
CFR Part: 
CFR Title: 

Content:
tent with other requirements. 1.3.5 Maintenance Considerations Instruments should be selected to require minimal maintenance and in-service inspection, as well as minimal time and numbers of personnel to conduct installation and maintenance. 2. Instrumentation at Multi-Unit Sites All units at the site should have the same instrumentation unless it can be demonstrated that the site conditions across the site are essentially the same and the structures of each unit are identical. In this case, a reduced set of instrumentation is permitted. In the case of separate control rooms for the same or different certified designs, annunciation should be provided to all control rooms as specified in Section C.7 of this guidance. 3. Seismic Instrumentation Operating Modes The seismic instrumentation should be functional during all modes of plant operation, including periods of plant shutdown. Maintenance and repair procedures should provide for keeping the maximum number of instruments in service during plant operation and shutdown. Procedures should be established to identify whether an instrument was operating appropriately during an earthquake following the functional check(s) recommended by the instrument manufacturer. Use the guidelines in Appendix A to Regulatory Guide 1.166 if the instrumentation was found to be out of service during an earthquake. 4. Instrumentation Characteristics 4.1 In-service Testing The design should include provisions for in-service testing. The instruments should be capable of periodic channel checks during normal plant operation. Instruments capable of “remote” in-service channel checks should be utilized. Some instruments may be placed in non-accessible locations; their design should allow for remote in- service testing. DG-1332, Page 9 4.2 In-place Functional Testing The instruments should have the capability for in-place functional testing. 4.3 Inaccessible Sensor Locations Instrumentation stations should be accessible for maintenance