05000298/FIN-2008003-02
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Finding | |
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| Title | Misaligned Lubricating Oil Piping Causes DG 2 Failure |
| Description | Introduction. The inspectors identified an unresolved item associated with the potentially inadequate installation of a flexible spool piece in the DG 2 main lube oil pump discharge line. Specifically, the improper installation of the flexible spool piece resulted in the fatigue failure of the main lube oil discharge piping and required DG 2 to be secured due to worsening lubricating oil leakage during a surveillance test. Description. On February 13, 2008, DG 2 was started for a monthly surveillance test per Surveillance Procedure 6.2DG.101. Approximately 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> after the start of the engine, an oil leak was discovered on the main lube oil pump discharge piping. As operators observed the leak, it worsened from seepage to an active stream of lubricating oil as the leak site developed into a 3-inch radial crack at the toe of a flange weld. Upon receiving the report that the oil leak was worsening, the operations shift manager declared DG 2 inoperable and DG 2 was secured. The licensees initial root cause effort determined that the oil leak was caused by vibration-induced fatigue failure, which had recently developed due to the improper installation of a flexible spool piece in the discharge piping of the main lube oil pump. The licensee documented this root cause determination in CR-CNS-2008-00968. The inspectors determined that the improper installation of the flexible spool piece was a performance deficiency, but that additional information was needed to determine the significance of any associated violations. Specifically, the licensee has not been able to demonstrate how or if the leak would have continued to develop with additional engine run time. The licensee has conducted an offsite evaluation of the failed spool piece with inconclusive results. The licensee is currently conducting an offsite performance test to determine how the cracked pipe would have behaved with continued DG 2 operation. The inspectors will review the results of this testing to determine whether any violations of NRC requirements occurred. Analysis. The inspectors determined that additional information was required to determine whether or not a violation of NRC requirements occurred and to determine the significance of any violations that are identified. Enforcement. Additional information was needed to determine whether a violation of regulatory requirements occurred. Pending further review of additional information provided by the licensee, this issue is being treated as an unresolved item: URI 05000298/2008003-02, Misaligned Lubricating Oil Piping Causes DG 2 Failure |
| Site: | Cooper  |
|---|---|
| Report | IR 05000298/2008003 Section 1R12 |
| Date counted | Jun 30, 2008 (2008Q2) |
| Type: | URI: |
| cornerstone | No Cornerstone |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.12 |
| Inspectors (proximate) | N Taylor B Baca G Miller W Sifre M Chambers M Bloodgood E Holcombk Claytong Guerra N Taylor P Elkmann C Graves S Garchow G Miller M Chambers |
| INPO aspect | |
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Finding - Cooper - IR 05000298/2008003 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Cooper) @ 2008Q2
Self-Identified List (Cooper)
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