Document: NUREG-0800
Document ID: 711747d3-335d-42bb-b30d-17cc0f6162ed
Document Type: srp
Title: SEISMIC INSTRUMENTATION
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340571.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.7.4
CFR Part: 
CFR Title: 

Content:
ndix A, and 10 CFR Part 50, § 50.55a, are as follows: The instrumentation used for the measurements should be capable of record- ing the effects produced by the most severe earthquakes that have been historically reported for the site and surrounding area with sufficient margin for the limited accuracy, quantity and period of time in which historical data has been accumulated. It is required in 10 CFR Part 100, Appendix A, that suitable instrumenta- tion shall be provided so that the seismic response of nuclear plant features important to safety can be determined promptly to permit com- parison of such response with that used as the design basis. 1.. Comparison with Regulatory Guide 1.12 The seismic instrumentation program is considered to be acceptable if it is in accordance with Regulatory Guide 1.12 (see also Table 3.7.4-1). This guide recommends provision of a triaxial time history accelerograph and a triaxial response spectrum recorder to measure the input time history and response spectra directly. Additional time history accelerographs, response spectrum recorders, peak accelerographs, and seismic switches are recommended to measure the responses of structures, equipment, and components at selected locations. The bases for elements of the proposed seismic instrumentation program that differ from Regulatory Guide 1.12 must be provided. 2. Location and Description of Instrumentation For the construction permit review there should be a commitment by the applicant to provide the following instruments at the given locations: 3.7.4-2 Rev. 1 - July 1981 a. A triaxial time history accelerograph in the free field or at the containment foundation, with readout in the control room. b. A seismic switch on the containment foundation, with readout in the control room. c. A triaxial response spectrum recorder on the containment foundation, with readout in the control room. In addition, a commitment to provide the recommended additional instru- mentation at the various