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:
tion 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. Radioactivity concentration or radiation level in circulating primary coolant N/A A continuous post-accident monitor is not necessary. Containment 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 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 A Category 3 position indication is acceptable if the accumulator isolation valves are locked-open, and motor-operated valves (i.e., power to the motor operators is disabled during normal operation) cannot change position during an accident. Pressurizer heater Indication At a minimum, status indication should be provided for pressurizer heaters governed by the technical BTP 7-10-12 Revision 6 – August 2016 Table 2. For PWRs: Acceptable Deviations and Clarifications to Revisions 2 and 3 of Regulatory Guide 1.97 Variable Deviation Acceptance Guidelines/Clarification status specification (i.e., heaters required to be served by emergency power). Quench tank temperature