05000255/FIN-2011014-07
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Finding | |
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| Title | Failure to perform an Adequate Operability Evaluation |
| Description | A finding of very low safety significance and associated non-cited violation of Title 10 of the Code of Federal Regulations (10 CFR) Part 50, Appendix B, Criterion V, Instructions, Procedures, and Drawings, was identified by the inspectors for the failure to implement a procedure for an activity affecting quality. Procedure EN-OP-104, Operability Determination Process, required an assessment of the operability for structures, systems, and components (SSCs) when degraded or non-conforming conditions were identified and establishment of compensatory measures were needed to, ensure, maintain, and enhance future operability. Specifically, the inspectors identified that the operability evaluation for the 125-Volt DC system, completed on September 30, 2011, did not contain two compensatory measures necessary to ensure the operability of the system. It was also identified that the 50.59 pre-screening (process applicability determination) for the temporary modification, which was also a compensatory measure for the operability evaluation, was not clearly written and did not adequately describe the evaluation of the modification or the bases for this decision. This issue was documented in the licensees corrective action program as CR-PLP-2011-04988 and CR-PLP-2011-04965 and at the end of the special inspection the licensee was still performing an evaluation to determine the causes and to develop corrective actions. The licensees remedial corrective actions included revising the 50.59 pre-screening to clearly address the effect of the compensatory measures on other aspects of the facility, prohibiting maintenance on the energized 125-Volt DC busses, and issuing additional site guidance for the operation of battery chargers. The inspectors determined that the finding was more than minor in accordance with IMC 0612, Power Reactor Inspection Reports, Appendix B, Issue Screening, because the finding was associated with the Mitigating Systems cornerstone attribute of Equipment Performance, and adversely impacted the objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, the attribute of equipment performance impacted the availability and reliability of the 125-Volt DC system. The inspectors determined that the finding could be evaluated using the SDP in accordance with IMC 0609, Significance Determination Process, Attachment 0609.04, Phase 1 - Initial Screening and Characterization of Findings, Table 4a, for the Mitigating Systems Cornerstone, dated January 10, 2008. The inspectors answered No to the Mitigating Systems questions and screened the finding as having very low safety significance (Green). The finding had a cross-cutting aspect in the area of human performance related to the cross-cutting component of Decision-Making, because the licensee did not adequately conduct an effectiveness review of a safety-significant decision to verify the validity of the underlying assumptions and identify possible unintended consequences, as necessary |
| Site: | Palisades  |
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| Report | IR 05000255/2011014 Section 4OA5 |
| Date counted | Dec 31, 2011 (2011Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 93812 |
| Inspectors (proximate) | A Dahbur A Scarbeary J Giessner R Krsek |
| Violation of: | Pending |
| CCA | H.14, Conservative Bias |
| INPO aspect | DM.2 |
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Finding - Palisades - IR 05000255/2011014 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Palisades) @ 2011Q4
Self-Identified List (Palisades)
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