05000397/FIN-2013010-04
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Finding | |
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| Title | Failure to Follow Procedures when Installing Roll-filters in Safety-related Air Handling Units |
| Description | The inspectors identified a non-cited violation of Technical Specification 5.4.1.a, Procedures, associated with the failure of the licensee to install roll-filters in safety-related room coolers in accordance with station procedures. Consequently, the roll-filter for the Division 1 critical switchgear air handling unit WMA-AH-53A was installed incorrectly which resulted in filter degradation and fouling of the air handling unit cooling coil. The licensee entered this issue into their corrective action program as Action Request AR 286069286069 The performance deficiency was more than minor because it affected the equipment performance attribute of the Mitigating Systems Cornerstone objective and adversely affected the cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. The inspectors performed the initial significance determination using NRC Inspection Manual Chapter 0609, Appendix A, Exhibit 2, Mitigating Systems Screening Questions. The inspectors determined that the finding required a detailed risk evaluation because it represented a potential loss of one train of safety related equipment for longer than the technical specification allowed outage time since the ventilation system supported several pieces of safety related equipment. The most limiting technical specification allowed completion time was just a few hours. A senior reactor analyst performed a risk evaluation. The analyst determined that, although potentially inoperable per the technical specifications definition, the ventilation fan remained functional and capable of performing for at least 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> the function credited in the licensees probabilistic risk assessment. Therefore the finding is of very low safety significance (Green). This finding had a cross-cutting aspect in the area of human performance associated with the work practices components because the licensee failed to implement human error prevention techniques, such as holding pre-job briefings, self and peer checking, and proper documentation of activities when installing horizontal roll-filters in safety-related applications. |
| Site: | Columbia  |
|---|---|
| Report | IR 05000397/2013010 Section 4OA5 |
| Date counted | Dec 31, 2013 (2013Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 93812 |
| Inspectors (proximate) | G Replogle J Groom R Lantz |
| Violation of: | Technical Specification Technical Specification - Procedures |
| CCA | H.12, Avoid Complacency |
| INPO aspect | QA.4 |
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Finding - Columbia - IR 05000397/2013010 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Columbia) @ 2013Q4
Self-Identified List (Columbia)
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