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:
tability should be based upon meeting applicable regulations, as stated above, consistent with current proven technologies and intended use of the recorded information. 1. Comparison with RG 1.12. The seismic instrumentation program is considered to be acceptable if it is in accordance with guidance provided in RG 1.12. The bases for elements of the proposed seismic instrumentation program that differ from RG 1.12 must be provided. This guide recommends installation of solid-state digital time-history accelerographs at appropriate locations in order to provide time history data on the seismic response of the free-field, containment structure, and other Seismic Category I structures. The COL, DC, and construction permit (CP) applicants should provide solid-state digital instrumentation that will enable the processing of data at the plant site within 4 hours of the seismic event. A triaxial time-history accelerograph should be provided at each of the locations specified in RG 1.12. Triggering of the free-field or any foundation-level accelerograph should be annunciated in the control room. In addition, applicants should provide a rationale for the placement of instrumentation which is consistent with maintaining occupational radiation exposures ALARA for the location. With regard to operability and installation, applicants should demonstrate that the seismic instrumentation will be operable during all modes of plant operation, including periods of plant shutdown. In addition, the applicant’s maintenance and repair procedures should provide for keeping the maximum number of instruments in service during plant operation and shutdown. Instruments should be designed and installed so that the mounting is rigid and oriented so that the horizontal components are parallel to the 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