05000261/FIN-2009002-01
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Finding | |
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| Title | Operability of the A emergency diesel generator from February 9 to March 10, 2009 |
| Description | The inspectors identified an unresolved item associated with two events in which maintenance technicians performed maintenance on the A emergency diesel generator (EDG) without pre-planning and performing the activity in accordance with written procedures, documented instructions, or drawings appropriate to the circumstances. This item is unresolved pending further inspection to determine whether those events rendered the A emergency diesel generator inoperable. On February 9, after the licensee started the A EDG for a routine surveillance test, operators noted a fuel oil leak of approximately 5 drops/minute from the inboard fitting on the fuel oil line from the duplex filter to the fuel injector for the #1 cylinder. After the control-room staff determined that a leak of that magnitude did not render the EDG inoperable, they completed the surveillance test and then initiated work request 369565 to repair the leaking fitting. After the test was complete, as directed by a maintenance supervisor, without any written instructions, and without the knowledge of the control-room staff, a maintenance technician tightened the leaking fitting with a wrench and reported to his supervisor some nut movement. The next day, work order 1496721 was first initiated in response to the subject work request and then cancelled with the following annotation; per the system engineer, there is no concern at this time. On March 9, after the licensee started the A EDG for another surveillance test, operators noted a fuel oil leak of approximately 100 drops/minute from the same fitting that had leaked during the February 9 test. While the March 9 test was underway, after Operations asked Maintenance to investigate the leak, and as directed by a maintenance supervisor, a maintenance technician used a wrench to check the fitting for tightness. Although the technician reported no nut movement, as a result of this activity the leak flow rate increased to what the licensee characterized as a steady stream. Following this increase in the leak rate, the control-room staff shut down the EDG and declared it inoperable. The licensee initiated a work request to repair the leak, converted that work request to a corresponding work order, and then under that work order replaced the leaking fitting on March 10. After removal, visual examination of the subject fitting revealed that it was cracked. After reviewing the related circumstances, the licensee determined that the February 9 maintenance activity had probably cracked the fitting. Because the February 9 maintenance activity and the March 9 maintenance activity both involved maintenance on a safety-related component without any documented instructions, both were performance deficiencies with respect to TS 5.4.1. This TS requires the licensee to establish, implement, and maintain written procedures covering the applicable procedures in Regulatory Guide 1.33. Regulatory Guide 1.33, Appendix A, section 9, Procedures for Performing Maintenance, states that maintenance that can affect the performance of safety-related equipment should be properly pre-planned and performed in accordance with written procedures, documented instructions, or drawings appropriate to the circumstances. These performance deficiencies are in the licensees corrective action program as AR 325384325384 Planned corrective actions are unknown because the licensee had not completed their investigation of this event before the end of the inspection period. Further inspection is required to determine whether the A EDG was operable during the period from February 9 through March 10. Specifically, further inspection should review any analyses produced by the licensee and/or evidence gathered by the licensee that relates to the operability of the A EDG during the subject period, and subsequently determine whether those results demonstrate that the A EDG was operable during that period. Pending completion of that review and determination, this issue is being treated as an unresolved item, and has been designated URI 05000261/2009002-01, Operability of the A emergency diesel generator from February 9 to March 10, 2009 |
| Site: | Robinson  |
|---|---|
| Report | IR 05000261/2009002 Section 1R15 |
| Date counted | Mar 31, 2009 (2009Q1) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.15 |
| Inspectors (proximate) | M Bates A Vargas-Mendez J Polickoski R Hagar R Musser J Zeiler E Morris C Fletcher N Smitha Nielseng Kuzo M Chitty R Aiello R Hagar R Musser N Griffis P Capehart E Morris |
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Finding - Robinson - IR 05000261/2009002 | |||||||||||||||||||||||||
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Finding List (Robinson) @ 2009Q1
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