05000331/FIN-2011005-04
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Finding | |
|---|---|
| Title | Licensee-Identified Violation |
| Description | The following violation of very low significance (Green) was identified by the licensee and is a violation of NRC requirements which meets the criteria of Section 2.3.2 of the NRC Enforcement Policy, for being dispositioned as an NCV. The licensee identified a finding of very low safety significance (Green) and an associated NCV of 10 CFR 50, Appendix B, Criterion V, Instructions, Procedures, and Drawings, for the failure to adequately implement post-maintenance testing of the A intake structure ventilation subsystem temperature controller. Specifically, on November 7, 2011, maintenance technicians incorrectly performed WO 40039255 for a replacement temperature controller. The testing was intended to demonstrate functionality of the A intake structure ventilation subsystem; however, human performance errors resulted in the test not revealing improper installation issues with the controller. On November 16, 2011, the licensee identified the performance deficiency and declared the A intake structure ventilation subsystem non-functional and the A RWS subsystem inoperable, entered the issue into the CAP as CR 1707561, and restored the A intake structure ventilation subsystem to a functional status. Because the A RWS subsystem remained available throughout the period of time the temperature controller was incorrectly installed, reasonable assurance existed to support the conclusion that the RWS safety function was not impacted. This failure to meet the requirements of WO 40039255 was a performance deficiency. The performance deficiency was more than minor because it was associated with the Mitigating Systems Cornerstone attribute of configuration control and human performance, and its objective of ensuring the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, had the licensee not identified the condition, environmental or operating conditions could have occurred which could have challenged availability of the A RWS system or impacted operability. The inspectors determined the finding could be evaluated using the SDP in accordance with IMC 0609.04, Phase 1 - Initial Screening and Characterization of Findings, Table 4a. Because the inspectors answered No to all five questions under Mitigating Systems Cornerstone column, the inspectors screened the finding as very low safety significance. |
| Site: | Duane Arnold  |
|---|---|
| Report | IR 05000331/2011005 Section 4OA7 |
| Date counted | Dec 31, 2011 (2011Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | R Orlikowski M Mitchell M Ring L Haeg R Murray J Beavers R Edwards |
| INPO aspect | |
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Finding - Duane Arnold - IR 05000331/2011005 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Duane Arnold) @ 2011Q4
Self-Identified List (Duane Arnold)
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