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:
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 response locations should be made without provid- ing details of actual locations. For the operating license review, a detailed seismic instrumentation plan including details of the locations, mounting and descriptions of the instru- mentation should be provided. To be acceptable, the remaining instrumenta- tion locations are related to the locations of the output vibratory motions used in the seismic design. Typical general locations are: a. Containment structure or reactor building. b. Reactor piping. c. Reactor equipment. d. Other Category I structures, equipment, and piping. Instrumentation should be provided depending upon the plant safe shutdown earthquake acceleration as given in Regulatory Guide 1.12. The specific locations are determined by the plant designer so as to obtain the most pertinent information. A possible approach to the specification of the seismic instrumentation system is given in Regulatory Guide 1.12. Other desirable combinations of instruments which may prove to be as useful as the instrumentation plan outlined in the guide may be utilized. The criteria for selection of Category I structures, components, and equip- ment to be instrumented and the location of instrumentation, as well as the extent to which this instrumentation is employed to verify the seismic analyses following an earthquake, should be specified. The criteria will be reviewed on a case-by-case basis. 3. Control Room Operator Notification To be acceptable, the seismic switch located at the foundation of the con- tainment should be connected to event indicators that are located in the control room, so that a signal is given when the preset threshold level (OBE acceleration level) resulting from the earthquake is exceeded. Also both audio and visual signals should be provided to