05000397/FIN-2013008-06
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Finding | |
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| Title | Inadequate Evaluation of Nonconforming Condition Resulting in Potential Missed Report |
| Description | The team identified an unresolved item involving a potential failure to submit a required licensee event report following discovery of a non-seismically qualified temperature switch in the diesel mixed air system. If this switch would have been unable to perform its safety function following a seismic event, its installation would have represented a condition prohibited by the plants technical specifications. On April 24, 2012, the licensee initiated CR 262245 documenting that the then-installed diesel mixed air temperature indicating switch DMA-TIS-22B was not seismically qualified. DMA-TIS-22B controls a heater that supports the train B emergency diesel generator; the switch is required to be Seismic Category I. Equipment qualification report QID 342003-01 listed the seismically qualified switch as model T26S-18; the licensee discovered that the installed switch was non-seismic model T22. The licensee was unable to determine when the nonseismic switch had been installed. On April 25, 2012, the licensee replaced the nonqualified switch with the correct, seismically qualified component under work order 01183010. To determine if the installation of the nonseismic switch represented a condition prohibited by technical specifications and therefore required a Licensee Event Report to be submitted to the NRC, the licensee initiated Seismic Qualification Task W01939-001. This engineering evaluation qualitatively compared the two switches and concluded that Model T22 switch was as seismically qualified as the Model T26S-18 switch. Based on the results of the engineering evaluation, the licensee concluded that the issue described in CR 262245 did not require a report to the NRC. The team determined that the engineering evaluation performed under W01939-001 did not meet the seismic qualification requirements specified in the Columbia Generating Station Final Safety Analysis Report (FSAR). Specifically, the FSAR, Section 3.10.1.2.2.4, provides for Mandatory Dynamic Testing in certain circumstances: When potential failure of Class 1E equipment cannot be evaluated structurally (e.g., opening or closing of electrical circuits), then vibration tests are required to demonstrate seismic adequacy. No analytical procedures are considered acceptable in these instances. The team determined that because diesel mixed air temperature indicating Switch DMA-TIS-22B has a required function involving the opening or closing of electrical circuits, the FSAR, Section 3.10.1.2.2.4, precludes qualitative analysis of the non-qualified switch to determine that the nonseismic switch was as seismically qualified ; vibration tests were required to demonstrate that the switch met Seismic Class I criteria. If the Model T22 switch cannot be demonstrated by acceptable methods to have met Seismic Class I requirements while installed, the licensees determination that the train B emergency diesel generator remained operable with the nonqualified switch is invalid. If the emergency diesel generator was inoperable while the nonseismic switch was installed, a licensee event report would have been required for a condition prohibited by technical specifications in accordance with 10 CFR 50.73(a)(2)(i)(B). This report would have been required by June 23, 2012, sixty days after the April 24, 2012, discovery of the nonconforming condition. At the conclusion of the inspection, the licensee planned to perform vibration testing of a model T22 switch. Following completion of that testing, additional review will be required to determine if this issue constituted a violation of NRC requirements. This issue is identified as URI 05000397/2013008-06, Inadequate Evaluation of Nonconforming Condition Resulting in Potential Missed Report. |
| Site: | Columbia  |
|---|---|
| Report | IR 05000397/2013008 Section 4OA2 |
| Date counted | Sep 30, 2013 (2013Q3) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | R Kellar J Groom L Micewski C Haleg Reploglej Groom J Laughlin M Hayes P Elkmann W Walker |
| INPO aspect | |
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Finding - Columbia - IR 05000397/2013008 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Columbia) @ 2013Q3
Self-Identified List (Columbia)
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