Document: NUREG-0800
Document ID: 924aeba2-7603-48d5-9467-ab37f7d036f0
Document Type: srp
Title: Revision 6 - August 2016
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1601/ML16019A169.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7
CFR Part: 
CFR Title: 

Content:
l 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 instrumentation is acceptable for verification of the status of an inerted containment. Range The range recommendation may be relaxed if it can be shown that the instrumentation will perform adequately during all accident and post-accident conditions. Suppression chamber and drywell spray flows Direct measurement The use of residual heat removal (RHR) flow, suppression chamber temperature and pressure, and drywell temperature and pressure are acceptable alternatives if it can be shown that (1) use of these variables can accurately and reliably measure the effectiveness of the drywell and suppression chamber spray in a timely manner, and (2) the position of the spray throttling valves can be monitored and the sprays adequately controlled from the control room using the alternative variables. Standby liquid control system (SLCS) flow Direct measurement Measurement of SLCS pump discharge pressure and SLCS storage tank level may be acceptable as an alternative indication that the SLCS pump is operating and that SLCS flow is occurring. Reactor building or secondary containment area radiation Category Area radiation monitors located in Mark III containments and in primary containments of other BWRs may be Category 2 as an alternative to Category 1 monitors. Area radiation monitors located in reactor building secondary containments for Mark I and Mark II plants and in other plant areas may be Category 3 in lieu of Category 2. Radiation exposure