05000220/FIN-2014003-02
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Finding | |
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| Title | Failure to Correct a Significant Condition Adverse to Quality in a Timely Manner |
| Description | The inspectors identified an NCV of Title 10 of the Code of Federal Regulations (10 CFR) Part 50, Appendix B, Criterion XVI, Corrective Action, for failure to ensure that corrective actions to preclude repetition for a significant condition adverse to quality were implemented in a timely manner. Specifically, corrective actions to preclude repetition for the April 16, 2013, loss of shutdown cooling event to revise two inadequate Unit 1 procedures had not been completed over a year later. If left uncorrected, the inspectors determined there was the potential for 10 different pumps and breakers to unexpectedly trip upon restoration of a direct current (DC) bus. The loss of several of these pumps and loads would result in an unexpected plant transient or require a manual reactor trip. Exelon wrote condition report (CR)-2014-005693 in response to the inspectors questions and determined that inadequate resources were assigned to this corrective action to preclude repetition. Procedures N1-OP-47A, 125 [volts direct current] VDC Power System, and N1-SOP- 47A.1, Loss of DC, were subsequently revised and issued on June 12, 2014. This finding is more than minor because it impacted the procedure quality attribute of the Initiating Events cornerstone and adversely affected the associated cornerstone objective to limit the likelihood of events that upset plant stability and challenge critical safety functions during shutdown as well as power operations. Specifically, if left uncorrected, there was the potential for 10 different pumps and breakers to unexpectedly trip upon restoration of a DC bus. Several of these pumps and loads would result in an unexpected plant transient or require a manual reactor trip. In accordance with IMC 0609.04, Initial Characterization of Findings, and Exhibit 1 of IMC 0609, Appendix A, The Significance Determination Process (SDP) for Findings At-Power, the inspectors determined that this finding is of very low safety significance (Green) because the finding did not involve the complete or partial loss of a support system that contributes to the likelihood of, or cause, an initiating event and affected mitigation equipment. This finding has a cross-cutting aspect of in the area of Problem Identification and Resolution, Resolution, because Exelon did not take effective corrective actions to address an issue in a timely manner commensurate with its safety significance. Specifically, Exelon failed to implement corrective actions to prevent recurrence (CA#1 from CR-2013-002926), to revise procedures N1-SOP-47A.1 and N1-OP- 47A to contain adequate guidance to ensure recovery from a loss of a DC bus would not result in an unexpected plant transient a year after the event occurred. |
| Site: | Nine Mile Point  |
|---|---|
| Report | IR 05000220/2014003 Section 4OA2 |
| Date counted | Jun 30, 2014 (2014Q2) |
| Type: | NCV: Green |
| cornerstone | Initiating Events |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | A Bolger A Rosebrook C Graves D Schroeder E Burket E Miller G Stock J Furia K Kolaczyk N Floyd |
| Violation of: | 10 CFR 50 Appendix B Criterion XVI |
| CCA | P.3, Resolution |
| INPO aspect | PI.3 |
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Finding - Nine Mile Point - IR 05000220/2014003 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Nine Mile Point) @ 2014Q2
Self-Identified List (Nine Mile Point)
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