05000261/FIN-2012005-01
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Finding | |
|---|---|
| Title | Adequacy of Preventative Maintenance for the Dedicated Shutdown Diesel Generator Cooling System |
| Description | On October 2, 2012, during monthly testing of the DSDG in accordance with OST-910, Dedicated Shutdown Diesel Generator Monthly, the control room received a DSDG Trouble alarm. Shortly after the alarm was received, the DSDG tripped. The licensee determined that the DSDG automatically tripped due to an engine jacket water over temperature condition. After the trip, licensee personnel inspected the engine and discovered that the drive belts for the belt driven radiator fan had come off the pulleys which prevented proper heat removal from the engine cooling system. All three drive belts were found to have varying degrees of wear and degradation. The last visual inspection of the fan belts was performed on September 12, 2011 and the last satisfactory surveillance run was performed on August 28, 2012. The DSDG is required to supply back-up power during a 10 CFR 50.65 Station Blackout condition and Appendix R conditions. Following the discovery of the thrown belts, the licensee replaced all three belts and performed a root cause evaluation. The root cause team determined that the cause of the failure was the lack of a time based replacement of the fan belts. The belts were last replaced in 2003. The inspectors reviewed the licensees root cause and asked additional questions regarding the expected service life of the fan belts. Additional inspection is required to review the licensees response to the inspectors questions and determine if a performance deficiency exists. |
| Site: | Robinson  |
|---|---|
| Report | IR 05000261/2012005 Section 1R12 |
| Date counted | Dec 31, 2012 (2012Q4) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.12 |
| Inspectors (proximate) | J Laughlin M Bates M Meeks R Musser S Walker A Alen C Scott D Lanyi J Eargle J Hickeyn Securit |
| INPO aspect | |
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Finding - Robinson - IR 05000261/2012005 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Robinson) @ 2012Q4
Self-Identified List (Robinson)
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