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:
tion of water carryover. Core temperature N/A This variable is not necessary for satisfying the guidelines identified in Reg. Guide 1.97, per NUREG 0737 Supplement 1, "Clarification of TMI Action Plan Requirements-Requirements for Emergency Response Capability." Appendix 7-A Rev. 4 — June 1997 BTP HICB-10-5 Table 1. Acceptable Deviations and Clarifications to Reg. Guide 1.97 for BWRs, cont. Variable Deviation Acceptance Guidelines/Clarification Drywell sump and drywell drain sumps level Category, Direct measurement Category 3 instrumentation (e.g., flow instrumentation) is an acceptable alternative to Category 1 instrumentation for this variable if it can be shown that: a. For small leaks, the alternate instrumentation will not experience a harsh environment; and b. For larger leaks, the sumps fill promptly and the sump drain lines isolate due to the increase in drywell pressure, negating the need for the measurement; and c. Drywell pressure and temperature indication can be used to detect leakage into the drywell; and d. The instrumentation 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 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. Radioactivity concentration or radiation level in circulating primary coolant N/A A continuous post-accident monitor is not necessary. Containment & drywell hydrogen concentration Range For plants where 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.