05000282/FIN-2012007-01
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Finding | |
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| Description | The inspectors identified an unresolved item due to differences between procedural guidance and the Updated Safety Analysis Report (USAR) regarding the number of emergency diesel generator (EDG) air receivers that needed to be pressurized to greater than 480 pounds per square inch gauge (psig) to support EDG operability. On October 15, 2010, the licensee initiated AR 1254304 to document that the D6 EDG 2A starting air compressor relief valve (2EG-39-7) was leaking. This condition caused the pressure in the 2A starting air receiver to drop below 480 psig. Upon identifying this condition, the operators checked the operating status of the remaining three air receivers and determined that the 1A receiver was also less than 480 psig due to maintenance on the 1A starting air compressor. The operations crew immediately declared the D6 EDG inoperable since Alarm Response Procedures C50001, D5 Engine 1 Remote Alarm Responses and C60001, D6 Engine 1 Remote Alarm Responses, contained a note which stated that the pressure in three out of four air receivers must be greater than 480 psig to maintain EDG operability. As part of this inspection, the inspectors reviewed the licensees evaluation and resolution of AR 1254304. The inspectors found that the 1A and 2A starting air compressors were repaired by the maintenance staff. Repairing the compressors allowed the pressure in the associated air receivers to be restored to normal operating levels. The inspectors also found that the licensee had assigned engineering personnel to evaluate whether the inability to maintain pressure in the 1A and 2A air receivers above 480 psig needed to be considered a maintenance rule functional failure. The inspectors reviewed the licensees completed maintenance rule evaluation and found that the condition of the 1A and 2A air receivers was not considered a functional failure due to information contained in the USAR which specified that only two of the four air receivers were needed for EDG operability. The inspectors were concerned by this conclusion since it was supported by information that conflicted with the alarm response procedures in effect in July 2010 and Procedure 2C20.7, D5/D6 Diesel Generators On August 3, 2012, the inspectors discussed the conflicting information with the licensee. The inspectors specifically discussed that the conflicting information could have resulted in one of the following conditions: Operations personnel declaring the D6 EDG inoperable due to overly conservative procedural guidance regarding air receiver pressure; or An incorrect maintenance rule evaluation may have been completed due to incorrect USAR information. The licensee initiated AR 1347636 to document the inspectors concern. The licensee was evaluating the actual number of air receivers required to be pressurized to greater than 480 psig to support EDG operability at the conclusion of the inspection. As a result, this issue will be considered unresolved pending the inspectors review of the licensees evaluation and a determination regarding whether the licensee had appropriately evaluated the conditions described in AR 1254304 |
| Site: | Prairie Island  |
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| Report | IR 05000282/2012007 Section 4OA2 |
| Date counted | Sep 30, 2012 (2012Q3) |
| Type: | URI: |
| cornerstone | Other |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | D Mcneil N Shah K Riemer K Stoedter E Sanchez-Santiagob Kemkerk Riemer K Stoedter P Zurawski T Bilik A Shaikh |
| INPO aspect | |
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Finding - Prairie Island - IR 05000282/2012007 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Prairie Island) @ 2012Q3
Self-Identified List (Prairie Island)
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