Document: NUREG-0800
Document ID: 71224475-ca63-4c09-acc1-c682d58112dd
Document Type: srp
Title: Revision 5 - March 2007
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550082.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7
CFR Part: 
CFR Title: 

Content:
s report (FSAR) that shows that pressure will remain on scale for all design basis transients and accidents. However, if an anticipated transient without scram (ATWS) analysis indicates that pressures exceeding FSAR values are possible, an expanded range of the Category 1 instrumentation should be provided. Containment sump level Range Separate narrow-range instrumentation is not required if the wide-range instrumentation satisfies the guidelines of Regulatory Guide 1.97 and is of sufficient range and accuracy to monitor the sump operation for all design basis conditions. 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 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 For plants in 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. BTP 7-10-11 Revision 5 - March 2007 Table 2 (cont.). For PWRs: Acceptable Deviations and Clarifications to Revisions 2 and 3 of Reg. Guide 1.97 Variable Deviation Acceptance Guidelines/Clarification 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