05000282/FIN-2010004-01
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Finding | |
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| Title | Review Licensees Evaluation of 122 Control Room Chiller Issue to Determine Whether Performance Deficiency Exists |
| Description | The inspectors identified an unresolved item (URI) concerning the ability of the licensees maintenance planning and protected equipment processes to adequately protect safety-related equipment from failure while performing maintenance activities on redundant and/or support equipment. On August 31, 2010, the inspectors performed a partial equipment alignment of the 122 Control Room Chiller due to maintenance being conducted on both the Bus 111 Unit Cooler and 121 Control Room Chiller. The 122 Control Room Chiller was considered to be protected equipment. During the walkdown, the inspectors noted that the suction pressure for the 122 Control Room Chiller Pump was less than the pressure band specified in the operating procedure and was steadily decreasing. The inspectors immediately contacted the control room to inform them of the decreasing pump suction pressure. The control room dispatched local operators to the scene to re-pressurize the system. In addition, maintenance workers in the Bus 111 room were contacted and told to stop all work activities. Operator actions to re-pressurize the system prevented the pump from tripping due to low suction pressure. Had the pump tripped, operations personnel may have been required to enter TS 3.0.3 for both units. The licensee entered the unexpected decrease in the pump suction pressure into the CAP as CAP 1247908. The licensee also planned to review whether deficiencies in work planning and/or the protected equipment program contributed to the decrease in pump suction pressure. As a result, this item was considered to be unresolved pending a review of the licensees corrective action evaluations (URI 05000282/2010004-01; 05000306/2010004-01; Review Licensees Evaluation of 122 Control Room Chiller Issue to Determine Whether Performance Deficiency Exists). |
| Site: | Prairie Island  |
|---|---|
| Report | IR 05000282/2010004 Section 1R04 |
| Date counted | Sep 30, 2010 (2010Q3) |
| Type: | URI: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.04 |
| Inspectors (proximate) | C Brown D Mcneil J Dalzell J Giessner K Stoedter L Kozak P Zurawski R Lerchc Thomasd Betancourt J Giessner K Stoedter M Phalen N Feliz Ordorno P Zurawski |
| INPO aspect | |
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Finding - Prairie Island - IR 05000282/2010004 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Prairie Island) @ 2010Q3
Self-Identified List (Prairie Island)
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