05000316/FIN-2017002-02
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Finding | |
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| Title | Unit 2 CEQ Fan Failed Surveillance |
| Description | Green . A finding of very low safety significance was self -revealed on March 23, 2017, when one of the Unit 2 Containment Equalization (CEQ) Fans, 2 HV CEQ 1, failed its surveillance. Technical Specification (TS) 5.4.1, Procedures, requires that the applicable procedures covered in Regulatory Guide 1.33 are established, implemented, and maintained. Regulatory Guide 1.33 requires that maintenance that can affect the performance of safety -related equipment should be properly preplanned and performed in accordance with documented instructions appropriate to the circumstances. Contrary to these requirements, a preventative maintenance activity to grease the backdraft damper bearings of the CEQ fan resulted in the fan being left inoperable until the next scheduled surveillance approximately a month later. Due to inadequate work instructions, the damper was not cycled enough times following greasing, which resulted in a condition where more force than allowed by the Technical Specifications was required to open the damper. Due to an inadequate post -maintenance test, this was not detected until the next surveillance was performed. Upon failure of the surveillance, technicians re -greased the bearings, cycled the damper, and tested it satisfactorily. Although qualified, the technicians who first performed the maintenance were unaware of certain nuances associated with the CEQ fan dampers. This information was not described in the work instructions and the post -maintenance test did not validate the opening force. The issue was entered into the CAP and an apparent cause evaluation was performed by the licensee. The issue was greater than minor because it adversely affected the Procedure Quality attribute of the Mitigating Systems cornerstone. Specifically, the inadequate maintenance procedures adversely affected the availability, reliability, and capability of a system that responds to initiating events to prevent undesirable consequences (i.e., core damage). The finding screened to Green, or very low safety significance, based on IMC 0609 Appendix H, Containment Integrity Significance Determination Process, because CEQ fans are not important contributors to Large Early Release Frequency and Hydrogen Igniters remained available. The inspectors determined there was a cross- cutting aspect associated with the finding, namely, H.5., Work Management. Specifically, the licensee did not identify and manage risk nor coordinate between different work groups when it was recognized the normal maintenance group would not be working on the CEQ Fan. Further, the apparent cause evaluation identified a need to better coordinate the preventative maintenance activities with the surveillance tests. |
| Site: | Cook  |
|---|---|
| Report | IR 05000316/2017002 Section 1R15 |
| Date counted | Jun 30, 2017 (2017Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71111.15 |
| Inspectors (proximate) | J Ellegood T Taylor T Go V Petrella L Rodriguez B Dickson |
| Violation of: | Technical Specification - Procedures |
| CCA | H.5, Work Management |
| INPO aspect | WP.1 |
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Finding - Cook - IR 05000316/2017002 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Cook) @ 2017Q2
Self-Identified List (Cook)
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