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:
mally 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 hydrogen concentration Range For plants where credit is taken for Class 1E hydrogen ignitors, the range recommendations may be relaxed if analysis shows the instrumentation will remain on scale through all design basis events with adequate margin for uncertainties. Accumulator tank level and pressure Category The safety function of the accumulator is performed passively by opening the discharge check valve when RCS pressure is lower than the tank pressure. Therefore, Category 3 instrumentation is an acceptable alternative to Category 2 if there are no operator actions that depend on use of this instrumentation for accident mitigation. Accumulator isolation valve position Category Category 3 position indication is acceptable if the accumulator isolation valves are locked open motor operated valves (i.e., power to the motor operators is disabled during normal operation) and cannot change position during an accident. Pressurizer heater status Indication At a minimum, status indication should be provided for pressurizer heaters governed by the technical specification (i.e., those heaters required to be served by emergency power). Rev. 4 — June 1997 Appendix 7-A BTP HICB-10-8 Table 2. Acceptable Deviations and Clarifications to Reg. Guide 1.97 for PWRs, cont. Variable Deviation Acceptance Guidelines/Clarification Quench tank temperature and pressure Range Pressure relief of the tank via rupture disk limits the temperature of the tank contents to saturated steam conditions (less than 750°F). Therefore, it is acceptable if the upper-range value includes (with adequate margin) the saturation temperature corresponding to the tank rupture disk relief pressure (e.g., a rupture disk relief pressure of 100 psig corresponds to 328°F