05000237/FIN-2010003-04
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Finding | |
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Title | Failure to Monitor Unit 3 Drywell Temperature |
Description | A finding of very low safety significance was identified by the inspectors on May 3, 2010, for the failure to monitor Unit 3 (U3) drywell temperature per commitments made to the NRC within LER 88-22, Supplement 2 to ensure that equipment in the drywell was operating within environmental qualification limits. No violation of regulatory requirements occurred. The licensees corrective actions were to reinstate the temperature monitoring of both drywells, perform walkdowns of both drywells for correct placement and to verify functionality of drywell thermocouples, improve administrative requirements on plant engineering turnover from one engineer to another, and train engineers to focus on identifying and validating assumptions when performing or reviewing technical products. This finding was placed in the licensees corrective action program as IR 1064681. The finding was determined to be more than minor because the finding was associated with the Mitigating Systems Cornerstone attribute of Equipment Performance and affected the cornerstone objective of ensuring the reliability of systems that respond to initiating events to prevent undesirable consequences. Specifically, the failure to monitor drywell temperatures and evaluate those temperatures against environmental qualification limits would have resulted in the motor operator for valve 3-1301-1 to exceed its qualified life without the licensees knowledge after D3R21. The inspectors determined 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. The inspectors were able to answer the first question, is the finding a design or qualification deficiency confirmed not to result in loss of operability or functionality, yes and, therefore, the finding screened as Green. The inspectors did not identify a cross-cutting aspect associated with this finding because the age of the finding did not reflect current performance. |
Site: | Dresden ![]() |
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Report | IR 05000237/2010003 Section 1R15 |
Date counted | Jun 30, 2010 (2010Q2) |
Type: | Finding: Green |
cornerstone | Mitigating Systems |
Identified by: | NRC identified |
Inspection Procedure: | IP 71111.15 |
Inspectors (proximate) | A Dunlop D Melendez-Colon W Slawinski C Phillips D Reeser B Palagi J Neurauter M Ring J Draper M Learn D Sand R Edwards R Jickling R Schulz J Tapp R Russell |
INPO aspect | |
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Finding - Dresden - IR 05000237/2010003 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Dresden) @ 2010Q2
Self-Identified List (Dresden)
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