Document: NUREG-0800
Document ID: 3571c6d8-6b1b-4c29-884c-33ab5be58d7f
Document Type: srp
Title: SEISMIC INSTRUMENTATION
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0704/ML070460349.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.7.4
CFR Part: 
CFR Title: 

Content:
e orthogonal axes assumed for the seismic analysis. Also, protections against accidental impacts should be provided. With regard to capabilities and characteristics, the seismic instrumentation should include each of the specifications identified in RG 1.12. This includes provisions for in- service testing, a remote alarm to indicate actuation, recording capabilities, sufficient 3.7.4-4 Revision 2 - March 2007 dynamic range and sampling rate, and a low and adjustable actuating level or trigger. In addition, both vertical and horizontal input vibratory ground motion should actuate the same time-history accelerograph. 2. Comparison with RG 1.166. The seismic instrumentation program is considered to be acceptable if it contains pre-earthquake planning and post-earthquake actions in accordance with RG 1.166. The bases for elements of the proposed seismic instrumentation program that differ from RG 1.166 must be provided. This guide provides guidance for a timely evaluation after an earthquake of the recorded seismic instrumentation data and for determining whether plant shutdown is required. The COL, DC, and CP applicants should provide a description of both pre-earthquake planning and post-earthquake actions in order to make a rapid determination of the degree of severity of the seismic event. The data from the seismic instrumentation, coupled with information obtained from a plant walkdown, should be used to make the initial determination of whether the plant must be shut down. With regard to the necessary baseline data, information related to seismic instrumentation, including instrument calibration, should be kept at the plant. The applicant’s program should also describe the necessary actions, such as selecting equipment and structures for inspections and the content of the baseline inspections, that are to be taken immediately after an earthquake, as described in RG 1.166. With regard to the evaluation of ground motion records, the applicant’s program should