Document: NRC Regulatory Guide
Document ID: 99fe445b-c440-4921-ba8f-841c8f236046
Document Type: regulatory_guide
Title: Nuclear Power Plant Instrumentation for Earthquakes + HISTORY - HISTORY 09/2016 – DG-1332 , Proposed Revision 3 04/2015 – Periodic Review on Revision 2 – Revise 02/1995 – DG-1033, Third Proposed Revision 2 11/1992 – DG-1016, Second Proposed Revision 2 07/1981 – Draft MS 140-5 , First Proposed Revision 2 (Rev. 3)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1610/ML16104A220.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.12
CFR Part: 
CFR Title: 

Content:
eam and feedwater piping) and provide effective isolation. recorder An instrument capable of recording the data from an acceleration sensor or sensors. safe shutdown earthquake ground motion (SSE) The vibratory ground motion for which certain structures, systems, and components are designed to remain functional. These structures, systems and components are those necessary to ensure: • The integrity of the reactor coolant pressure boundary, • The capability to shut down the reactor and maintain it in a safe shutdown condition, or • The capability to prevent or mitigate the consequences of accidents that could result in potential offsite exposures of nuclear radiation exceeding allowable amounts. secondary containment The structure surrounding the primary containment that acts as a further barrier to control the release of radioactive material. secondary Category I structure, system, or component Structures, systems, and components (SSCs) important to safety that are required to be designed/qualified to withstand the effects of the safe shutdown earthquake ground motion (SSE) and remain functional. Guidance for determining the category of an SSC is given in RG 1.29, “Seismic Design Classification.” seismic trigger A device that starts the time-history recorder after a preset acceleration has been exceeded. standard design A design which is sufficiently detailed and complete to support certification or approval in accordance with 10 CFR Part 52 , and which is usable for a multiple number of units or at a multiple number of sites without reopening or repeating the review. standard design certification or design certifification A Commission approved final standard design for a nuclear power facility. This design may be referred to as a certified standard design. DG-1332, Page 21 standardized cumulative absolute velocity See Cumulative Absolute Velocity (CAV). time history recorder An instrument capable of sensing and recording acceleration versus time. The