Document: NUREG-0800
Document ID: 43123a17-321c-4751-b3ba-9ba5e9b0b364
Document Type: srp
Title: Draft Revision 6 – August 2015
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1515/ML15159A726.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7
CFR Part: 
CFR Title: 

Content:
. Coolant level in reactor vessel • Range • Redundancy If redundant channels of Category 1 instrumentation cover the fuel zone and the wide range (i.e., all manual and automatic trip functions), a single channel of Category 3 upset range instrumentation (from the upper end of the wide range to the top of the vessel or centerline of the main steam line) is acceptable for detection of water carryover. Core temperature N/A RG 1.97 Rev. 2 & 3 Table 2, “BWR Variables,” lists core temperature as a Type B and Type C variable used to provide diverse indication of reactor vessel water level. However, NUREG-0737, Supplement 1, “Clarification of TMI Action Plan Requirements: Requirements for Emergency Response Capability,” Section 6.1b later clarified, “BWR incore thermocouples and continuous offsite dose monitors are not required pending their further development and consideration as requirements.” The aforementioned development and considerations were not complete as of the publication of Rev. 3 of RG 1.97. Therefore, it is an acceptable deviation to not include Core Temperature as measured by qualified incore thermocouples as a RG 1.97 Rev. 2 or Rev. 3 variable. 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; (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; (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 A redundant