05000390/FIN-2014003-03
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Finding | |
|---|---|
| Title | Failure to Comply with Design Drawing Results in a Reactor Trip |
| Description | An NRC-identified finding was documented by the inspectors for the licensees failure to comply with a design drawing during a modification resulting in a trip of Unit 1 reactor. The inspectors determined that the licensees failure to properly implement Design Change Notice (DCN) 52295, complete bus differential wiring for main bus 2, as required by NPG-SPP-09.3, Revision 17, Plant Modifications and Engineering Change Control, was a performance deficiency. The performance deficiency was determined to be more than minor because it adversely affected the objective of the Initiating Events cornerstone to limit the likelihood of events that upset plant stability and challenge critical safety functions during shutdown as well as power operations. Specifically, the failure to correctly translate design drawings to implementing work order 08-816022-006 resulted in Unit 1 experiencing a 100 percent load rejection and reactor trip. Using the screening worksheet of IMC 0609, Appendix A, Exhibit 1 - Initiating Events Screening Questions, the inspectors determined that the finding was of very low safety significance (Green) because the resulting transient was within the design basis for Unit 1 and all plant systems functioned as required to place the unit in a stable, hot standby condition. The cause of the finding was directly related to the aspect of work management in the Human Performance cross-cutting area because the licensee failed to implement a process of planning, controlling, and executing work activities such that nuclear safety was the overriding priority. |
| Site: | Watts Bar  |
|---|---|
| Report | IR 05000390/2014003 Section 4OA3 |
| Date counted | Jun 30, 2014 (2014Q2) |
| Type: | Finding: Green |
| cornerstone | Initiating Events |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71153 |
| Inspectors (proximate) | C Dykes C Kontz E Patterson J Bartley J Rivera Ortiz K Miller M Magyar N Karlovich P Cooper R Monk T Steadham W Loo |
| CCA | H.5, Work Management |
| INPO aspect | WP.1 |
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Finding - Watts Bar - IR 05000390/2014003 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Watts Bar) @ 2014Q2
Self-Identified List (Watts Bar)
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