05000387/FIN-2010005-05
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Finding | |
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| Title | Failure to Evaluate a Non Conforming Condition Resulted in an Alert |
| Description | A self-revealing finding of very low safety significance (Green) was identified against PPLs CAP procedure NDAP-QA-0702, Action Request and CR Process. A non-conforming condition with system design requirements was identified with the A Reactor Building (RB) chiller filter line. Specifically, the line was vibrating excessively and a support for the line was missing when compared to other identical chillers. Action Request (AR) 888836 was written to document this condition in July 2007. However, the nonconformance with system design was not evaluated and corrective actions were not developed. Subsequently, in September 2008 an elbow in the line failed. The elbow was repaired; however, the missing support was not evaluated and replaced. As a result on August 10, 2010, the same elbow failed again resulting in the evacuation of the Unit 1 RB and the declaration of an ALERT due to toxic gas levels within the vital area of the plant. PPL entered the issue into their CAP (1291181), conducted repairs to the A RB chiller, and conducted a root cause analysis (RCA). This finding is more than minor as it affected the protection against external events (toxic gas) attribute of the corresponding Mitigating Systems cornerstone objective to ensure the reliability and capability of systems that respond to initiating events to prevent undesirable consequences (i.e., core damage). Specifically, the August 10, 2010, Freon leak and Unit 1 RB evacuation impacted the plant operators ability to access and operate safety-related equipment located within the Unit 1 RB which are required to be operated in accordance with Emergency and Abnormal Operating Procedures during plant transients and events. The finding was evaluated for significance using IMC 0609, Attachment 4, Phase 1 - Initial Screening and Characterization of Findings. Since the finding was not a design or qualification deficiency, did not result in a loss of safety function or 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 was assigned a cross-cutting aspect in the area of PI&R -Operating Experience (OE)- Implementation of OE, because PPL failed to implement and institutionalize OE through changes to station processes, procedures, equipment, and training programs. Specifically, PPL did not incorporate American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE) codes, Dupont Refrigerant Piping Handbook, and the Carrier Piping Manual in the modification, evaluation, and troubleshooting of site refrigeration systems. |
| Site: | Susquehanna  |
|---|---|
| Report | IR 05000387/2010005 Section 4OA2 |
| Date counted | Dec 31, 2010 (2010Q4) |
| Type: | Finding: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | M Patel J Furia A Rosebrook P Finney P Krohn T Hedigan J Greives |
| CCA | P.5, Operating Experience |
| INPO aspect | CL.1 |
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Finding - Susquehanna - IR 05000387/2010005 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Susquehanna) @ 2010Q4
Self-Identified List (Susquehanna)
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