05000458/FIN-2015010-01
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Finding | |
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| Title | Technical Specification Allowed Outage Time During Loss of Non-Technical Specification Supported Systems |
| Description | The team identified an unresolved item related to the licensees treatment of the control building chilled water system (HVK) chillers as a non-technical specification support system for other technical specification systems. The team noted that when an entire division of HVK chillers is out of service, such as chillers 1A and 1C for division I, the licensee would only enter the Technical Specification (TS) 3.7.3, Control Room Air Conditioning (AC) System, action statement for the condition of one control room AC subsystem being inoperable (condition A). The licensee did not enter TS action statements associated with inoperability of other components cooled by HVK chillers, such as the AC switchgear, DC switchgear, and vital inverters. The licensee, instead, has incorporated a safety evaluation for the Perry Plant (ML020950074), dated April 5, 2002, into the bases for TS 3.0.6 and applied that document as guidance: ...no TS limits the duration of the non-TS support subsystem outage, even though the single-failure design requirement of the supported TS systems is not met. However, by assessing and managing risk in accordance with 10 CFR 50.65(a)(4), an appropriate duration for the maintenance activity can be determined. The NRC team questioned whether the Perry Plants safety evaluation could be applied generically, if the licensee improperly incorporated the safety evaluation via the 10 CFR 50.59 process, if the guidance conflicted with section 9.2.10.3 of the Updated Safety Analysis Report (USAR) for River Bend Station, and if the safety evaluation for the Perry Plant conflicted with guidance found in Generic Letter 80-30, Clarification of the Term Operable As It Applies to Single Failure Criterion For Safety Systems Required by TS. The aggregate impact of these decisions resulted in the River Bend Station placing TS systems cooled by HVK, such as the AC switchgear, DC switchgear, and vital inverters, in a single-failure vulnerable configuration for durations exceeding the allowed outage time specified in the TS. Pending further evaluation of the above issue by NRC Headquarters staff via a Technical Specification interpretation request (ML15231A111) and subsequent review by NRC inspectors, this issue will be tracked as URI 05000458/2015010-01, Technical Specification Allowed Outage Time During Loss of Non-Technical Specification Supported Systems. Further discussion of performance deficiencies associated with the HVK chiller system is included in Section 2.6.a of this report. |
| Site: | River Bend  |
|---|---|
| Report | IR 05000458/2015010 Section 4OA5 |
| Date counted | Mar 31, 2016 (2016Q1) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 93812 |
| Inspectors (proximate) | B Parks C Young F Ramirez G Warnick J Drake J O'Donnell J Sowa N Greenec Smithd Bradley E Uribe J Watkins R Deese T Pruett |
| INPO aspect | |
| Finding closed by | |
| IR 05000458/2017001 (1 May 2017) | |
| ' | |
Finding - River Bend - IR 05000458/2015010 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (River Bend) @ 2016Q1
Self-Identified List (River Bend)
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