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:
nd the analytical model used for the design of the plant are adequate and that allowable stresses are not exceeded under conditions where continuity of operation is intended. Provision of such seismic instrumentation complies with Regulatory Guide 1.12. V. IMPLEMENTATION The following is intended to provide guidance to applicants and licensees regarding the NRC staff's plans for using this SRP section. Except in those cases in which the applicant proposes an acceptable alterna- tive method for complying with specified portions of the Commission's regula- tions, the method described herein will be used by the staff in its evaluation of conformance with Commission regulations. VI. REFERENCES 1. 10 CFR Part 50, § 50.55a "Codes and Standards." 2. 10 CFR Part 50, Appendix A, "General Design Criteria for Nuclear Power Plants." 3. 10 CFR Part 100, Appendix A, "Seismic and Geologic Siting Criteria for Nuclear Power Plants." 4. Regulatory Guide 1.12, "Instrumentation for Earthquakes." 3.7.4-6 Rev. 1 - July 1981 TABLE 3.7.4-1 SEISMIC INSTRUMENTATION REQUIREMENTS Instrumentation Triaxial Triaxial Response Triaxial Peak Seismic Time-History Spectrum Recorder Accelerograph Switch Accelerograph Location SSE 0.3 g over 0.3 g over 0.3 g over 0.3 g over or less 0.3 g or less 0.3 g or less 0.3 g or less 0.3 g I. Free Field 1*# 1*# II. Inside Containment Basement 1* 1* 1* 1* 1* 1* At Elevation 1 1 Reactor Equip. Sup. }1 }1 }1* Reactor Piping Sup. Reactor Equipment 1 1 Reactor Piping 1 1 4 III. Outside Containment Cat. I Structure 1 1 1 Cat. I Equip. Sup. 1 Cat. I Piping Sup. }1 1 Cat. I Equipment 1 Cat. I Piping 11 1 *Control room readout. #May be omitted if soil-structure interaction is negligible. }Denotes either of the two locations. TABLE 3.7.4-2 SEISMIC MONITORING INSTRUMENTATION SURVEILLANCE REQUIREMENTS INSTRUMENT 1. Triaxial Time-History Accelerographs 2. Triaxial Peak Accelerographs 3. Triaxial Seismic Switches 4. Triaxial Response-Spectrum Recorders CHANNEL CHANNEL CHECK