05000387/FIN-2010003-02
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Finding | |
|---|---|
| Title | Failure to Correct Condition Adverse to Quality |
| Description | A self-revealing, Green NCV of 10 CFR 50.65(a)(4), occurred when PPL failed to conduct an adequate risk assessment of online maintenance activities on April 22, 2010. A maintenance activity that caused the 11 B bus tie supply feeder breaker from the startup transformer (Breaker 1A10204) to be inoperable was not modeled in the equipment out-of-service (EOOS) risk model despite work being commenced. A reactor scram occurred that day during unrelated testing and was complicated by the resulting equipment configuration that included the loss of the 11 B Bus and its associated \"B\" reactor recirculation pump and \"9\" condensate pump. Additionally, the \"9\" and \"c\" reactor feed pump turbines (RFPTs) tripped due to low suction pressure caused by the loss of the \"9\" condensate pump. When the maintenance activity was properly modeled, plant risk was reclassified from Green to Yellow. PPL entered the issue in their CAP and is conducting an evaluation of their work planning process. This NCV affected the Mitigating Systems cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences (i.e., core damage). The item is similar to example 7.e. in IMC 0612 Appendix E, \"Examples of Minor Issues,\" in that failure to perform an adequate risk assessment when required by 1 0 CFR 50.65 (a)(4) is \"not minor if the overall elevated plant risk would put the plant into a higher licensee established risk category.\" In this case, plant risk went from Green to Yellow when the maintenance was properly modeled; therefore, the violation is more than minor. The inspectors evaluated the finding using IMC 0612 Appendix K, \"Maintenance Risk Assessment and Risk Management Significance determination Process.\" Since the incremental core damage probability deficit was less than 1 E-6 and the incremental large early release probability deficit was less than 1 E-7, this finding is determined to be of very low safety significance (Green). This finding was determined to have a cross-cutting aspect in the area of Human Performance, Work Control in that PPL failed to appropriately plan work activities by not incorporating risk insights associated with breaker maintenance. |
| Site: | Susquehanna  |
|---|---|
| Report | IR 05000387/2010003 Section 1R13 |
| Date counted | Jun 30, 2010 (2010Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71111.13 |
| Inspectors (proximate) | A Rosebrook E Huang E Torres J Bream J Furia J Greives P Finney P Krohn |
| CCA | H.5, Work Management |
| INPO aspect | WP.1 |
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Finding - Susquehanna - IR 05000387/2010003 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Susquehanna) @ 2010Q2
Self-Identified List (Susquehanna)
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