05000305/FIN-2009002-05
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Finding | |
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| Title | Emergency Diesel Generator (EDG) Air System May Not Be Appropriately Qualified |
| Description | The inspectors identified an unresolved item associated with the qualification of the EDG air start system. Specifically, the EDG starting air compressors were previously qualified Quality Assurance (QA) level 1 (QA-1) and may have been inappropriately downgraded to QA-2.Description: While reviewing of procedure OP-KW-OSP-DGE-006B, Diesel Generator B Start-up Air Leakage Test, the inspectors noted that the air receivers also supply controlling air to the ventilation dampers in the diesel rooms. Because the dampers and starting air were supplied from the system, the inspectors reviewed the calculations for the capacity of the air receivers and assessed the design basis of the associated air compressors. The design of the system consisted of a normal and a spare bank of air receivers and an associated air compressor for each diesel generator. The air receivers for each diesel had the capability of be interconnected both to the designated diesel and to the alternate diesel. Additionally, procedures and equipment existed to interface the diesel air system with the station instrument air system through the use of hoses stationed locally for this purpose. The inspectors reviewed the calculation for the diesel air receivers and found that the capacity of the receivers supported five start sequences of the diesel and had enough additional capacity to run the ventilation dampers for approximately 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. The inspectors noted that with this capacity the safety-related air receivers, even if interconnected, could not support the diesel generator for the seven days needed to meet the TS fuel oil mission time. The inspectors also reviewed station documentation to ascertain the diesel generator mission time, but were unable to find any information to support a specific interval. Because the air receivers were only designed to support24 hours of operation without replenishment, the inspectors reviewed the qualifications of the supporting air compressors. The inspectors found that the air compressors, piping, and related power was, at one time, all classified as both seismic and QA-1; however, the compressors had been downgraded to QA-2 due to replacement part issues. The inspectors asked the licensee to provide the design basis supporting the lower qualification of the air compressors and the acceptability of the design. The licensee entered this issue into its corrective action program as CR 326432, Missing Design and Licensing Basis for EDG Start Up Air System. This CR and associated operability determination supported the immediate operability assessment of the diesel generator; however, related prompt operability assessments were in-progress at the close of the inspection period. The inspectors considered this issue unresolved pending review of the licensees assessment and/or reconstitution of the related licensing basis and operability evaluation (URI 05000305/2009002-05) |
| Site: | Kewaunee  |
|---|---|
| Report | IR 05000305/2009002 Section 1R22 |
| Date counted | Mar 31, 2009 (2009Q1) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.22 |
| Inspectors (proximate) | M Munir J Cassidy T Bilik M Kunowski S Burton K Barclayj Cassidym Kunowski S Burton K Barclay D Lawver |
| INPO aspect | |
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Finding - Kewaunee - IR 05000305/2009002 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Kewaunee) @ 2009Q1
Self-Identified List (Kewaunee)
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