Document: NUREG-0800
Document ID: 5c379bc2-cb0b-42ca-93af-dedf43c6cb30
Document Type: srp
Title: Appendix 7-A
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0525/ML052500542.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7
CFR Part: 
CFR Title: 

Content:
s 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 & drywell oxygen Concentration (inerted containment) Range As an alternative to total conformance to Category 1 criteria, qualified instrumentation up to 5 volume percent (v/o) and redundancy up to 10 v/o is acceptable if it can be shown that the instrumentation will perform adequately during all accident and post-accident conditions. Rev. 4 — June 1997 Appendix 7-A BTP HICB-10-6 Table 1. Acceptable Deviations and Clarifications to Reg. Guide 1.97 for BWRs, cont. Variable Deviation Acceptance Guidelines/Clarification Suppression chamber & drywell spray flows Direct measurement The use of 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) that the position of the spray throttling valves can be monitored and the sprays adequately controlled from the control room using the alternate variables. SLCS flow Direct measurement Measurement of SLCS pump discharge pressure and SLCS storage tank level may be acceptable as an alternate 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 rate/variables used to monitor airborne radioactive materials released from plant Category If the instrument