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:
ng a standard input signal or suitable time history (e.g., the October 1987 Whittier, California, earthquake). Information relative to CAV data can be found in Electric Power Research Institute (EPRI) TR-100082, "Standardization of the Cumulative Absolute Velocity" (Ref. 13). Downhole instrumentation needs to be retrieved only for repair. After a sensor package has been retrieved, the redeployment should, if at all possible leave the instrument at the same depth in the hole, and oriented the same as during the previous period to maintain consistency with other instruments on the site and previously recorded earthquake motions. 9.2 Schedule 9.2.1 General Maintenance schedules should specify timing of inspections, and replacement of such items that have a specified lifetime. Adequate consideration should be given to the characteristics and operational life of each type of equipment. 9.2.2 Specific Maintenance Tasks Systems should be given channel checks every 2 weeks for the first 3 months of service after startup. Failures of devices normally occur during initial operation. After the DG-1332, Page 15 initial 3-month period and 3 consecutive successful checks, monthly channel checks are sufficient. The monthly channel check should include checking the batteries. The channel functional test should be performed every 6 months. Channel calibration should be performed every 18 months or during each refueling outage, whichever comes first. Accessible instrumentation should be visually inspected once per month in order to detect signs of physical damage. Instruments that cannot be inspected monthly should be visually inspected when plant operations allow. A justification for extending inspections to a periodicity greater than one month should be justified and supported by related procedures. If an instrument become non-functional and needs to be replaced it should be replaced by a comparable accelerograph with specifications same or exceeding the current requirements