Document: NUREG-0800
Document ID: 43123a17-321c-4751-b3ba-9ba5e9b0b364
Document Type: srp
Title: Draft Revision 6 – August 2015
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1515/ML15159A726.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7
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Content:
ation neither automatically initiates nor alerts the operator to initiate operation of a safety system in a post-accident situation. Primary containment isolation valve position Redundancy A redundant position indication for each active containment isolation valve is not necessary because the valves are redundant. Likewise, position indication is not necessary for valves within the operator’s cognizance that are normally closed and remain closed after an accident, and that are administratively controlled. Primary system safety relief valve positions, including automatic depressurization system (ADS) or flow through pressure in valve lines Category Category 3 safety relief valve (SRV) position indication is an acceptable alternative to Category 2 instrumentation for this variable, provided that a plant-specific evaluation documents that the analysis of NEDO-33160, “Regulatory Relaxation for the Post Accident SRV [Safety Relief Valve] Position Indication System,” applies to the plant and that the requirements of NUREG-0737, Item II.D.3, and 10 CFR 50.34(f) continue to be met. BTP 7-10-9 Draft Revision 6 – August 2015 Table 1. For BWRs: Acceptable Deviations and Clarifications to Revisions 2 and 3 of Regulatory Guide 1.97 Variable Deviation Acceptance Guidelines/Clarification Radioactivity concentration or radiation level in circulating primary coolant N/A A continuous post-accident monitor is not necessary. Containment and drywell hydrogen concentration Category In accordance with 10 CFR 50.44, Category 3 instrumentation is acceptable for diagnosing the course of beyond design basis accidents. Range In plants for which credit is taken for Class 1E hydrogen ignitors, the range recommendations may be relaxed if analysis shows that the instrumentation will remain on scale through all design basis events with adequate margin for uncertainties. Containment and drywell oxygen concentration (inerted containment) Category In accordance with 10 CFR 50.44, Category 2