05000387/FIN-2011002-03
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Finding | |
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Title | B\' CS Chiller lnoperable due to Refrigerant Stacking |
Description | The inspectors identified a Green finding for failure to evaluate the condition of the \'B\' control structure (CS) chiller after completion of SE-054-301, Emergency Service Water/Control Structure Chilled Water System Leakage Test, Revision 12. Specifically, personnel failed to evaluate whether system parameters were restored to normal prior to restoring the chiller to an operable status and, when maintenance subsequently reported that refrigerant level was non-visible, failed to appropriately evaluate the degraded condition with regard to equipment operability. PPL entered this issue into their CAP as CR 1382448. The finding is more than minor because it is associated with the equipment performance attribute of the Mitigating systems cornerstone and affected its objective to ensure the availability, reliability, and capability of syster4s that respond to initiating events to prevent undesirable consequences (i.e., core damage). Specifically, the condition of refrigerant stacking that occurred affected the reliability of the \'B\' CS Chiller. The finding was evaluated for significance using IMC 0609, Attachment 4, Phase 1 - lnitial Screening and Characterization of Findings. Since the finding did not result in a loss of safety function or the loss of a train for greater than its Technical Specification (TS) allowed outage time, and was not potentially risk significant due to external event initiators, the finding was determined to be of very low safety significance (Green). This finding is related to the cross-cutting area of Pl&R - CAP, because PPL did not thoroughly evaluate problems such that the resolutions address the causes and extent of conditions, to include properly classifying, prioritizing and evaluating for operability. Specifically, PPL failed to appropriately evaluate the effect that refrigerant stacking had on the operability of the CS chiller and subsequently, failed to evaluate the CAQ and assign corrective actions. (P.1(c)) |
Site: | Susquehanna ![]() |
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Report | IR 05000387/2011002 Section 4OA2 |
Date counted | Mar 31, 2011 (2011Q1) |
Type: | Finding: Green |
cornerstone | Mitigating Systems |
Identified by: | NRC identified |
Inspection Procedure: | IP 71152 |
Inspectors (proximate) | E Dipaolo J Furia A Rosebrook P Finney J Tomlinson J Greives D Molteni |
CCA | P.2, Evaluation |
INPO aspect | PI.2 |
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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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