05000387/FIN-2011002-05
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Finding | |
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| Title | lnadequate Maintenance Procedure Results in Steam Leak and Manual Scram |
| Description | A self-revealing finding of very low safety significance (Green) was identified when PPL personnel did not have adequate procedures to perform maintenance on a threaded connection on the \'5C\'feedwater heater (FWH) extraction steam bleeder trip valve, (BTVX 0245C. Specifically, existing maintenance procedures did not ensure that a threaded vent plug was reinstalled properly following maintenance. As a result, on January 25,2011, the threaded plug was ejeqted from the vent hole resulting in a steam leak that was un-isolable without removing thb main turbine from service. The steam leak caused malfunctions of non-safety-relatdd electrical systems and ultimately led to a manual reactor scram by control room operators. PPL entered this issue in their CAP as condition report CR 1346952. The finding was more than minor because thd finding was associated with the Initiating Events cornerstone attribute of Equipment Performance, and affected the cornerstone objective of limiting the likelihood of those events that upset plant stability and challenge critical safety functions during power operatiofr. Specifically, failure of the pipe plug resulted in an un-isolable steam leak that ultirnately led to a manual scram. The inspectors evaluated the finding using IMC 0609, Attachment 4, lnitial Screening and Characterization of Findings, and determined the finding did not contribute to both the likelihood of a reactor trip and the likelihood that mitigation equipment or functions would not be available. In this case, the main condenser was available as mitigation equipment once the turbine was tripped and the leak was isolated. Consequently, the finding is of very low safety significance This finding is related to the crosscutting area of Human Performance , because PPL did not ensure that personnel, equipment, procedures, and other resources were available and adequate to assure nuclear safety. Specifically, PPL did not ensure that complete, accurate and up to- date procedures were available to reinstall a threaded plug on a BTV in the FWH extraction steam line. (H.2(c)) |
| Site: | Susquehanna  |
|---|---|
| Report | IR 05000387/2011002 Section 4OA3 |
| Date counted | Mar 31, 2011 (2011Q1) |
| Type: | Finding: Green |
| cornerstone | Initiating Events |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71153 |
| Inspectors (proximate) | E Dipaolo J Furia A Rosebrook P Finney J Tomlinson J Greives D Molteni |
| CCA | H.7, Documentation |
| INPO aspect | WP.3 |
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Finding - Susquehanna - IR 05000387/2011002 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Susquehanna) @ 2011Q1
Self-Identified List (Susquehanna)
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