05000237/FIN-2011005-01
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Finding | |
|---|---|
| Title | Bus 23 Pot Fuse Drawer Resulting in the Inoperability of the Control Room Emergency Ventilation Air Condition System |
| Description | A self-revealed finding of very low safety significance and associated NCV of 10 CFR Part 50, Appendix B, Criterion V, Instructions, Procedures, and Drawings, was identified on October 24, 2011, when two electrical maintenance technicians performing a clearance boundary safety verification opened a Bus 23 potential transformer (POT) fuse drawer causing an undervoltage load shed signal that resulted in the inoperability of the control room emergency ventilation (CREV) air conditioning system. Corrective actions taken included an electrical maintenance department clock reset and stand down to discuss the event and consequences of taking actions in the plant without proper guidance. Further licensee planned corrective actions include presenting to Operations and the Configuration Control Committee the possibility of installing robust barriers or locking devices on bus POT installations. A self-revealed finding of very low safety significance and associated NCV of 10 CFR Part 50, Appendix B, Criterion V, Instructions, Procedures, and Drawings, was identified on October 24, 2011, when two electrical maintenance technicians performing a clearance boundary safety verification opened a Bus 23 potential transformer (POT) fuse drawer causing an undervoltage load shed signal that resulted in the inoperability of the control room emergency ventilation (CREV) air conditioning system. Corrective actions taken included an electrical maintenance department clock reset and stand down to discuss the event and consequences of taking actions in the plant without proper guidance. Further licensee planned corrective actions include presenting to Operations and the Configuration Control Committee the possibility of installing robust barriers or locking devices on bus POT installations. |
| Site: | Dresden  |
|---|---|
| Report | IR 05000237/2011005 Section 4OA3 |
| Date counted | Dec 31, 2011 (2011Q4) |
| Type: | NCV: Green |
| cornerstone | Initiating Events |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71153 |
| Inspectors (proximate) | R Langstaff T Briley T Go A Shaikh B Kemker C Phillips D Lords D Melendez Colon F Ramirez J Cameron J Corujo Sandin M Bielby P Smagacz R Jicklingj Beaversj Cameron M Jones N Valos R Langstaff T Briley T Go Z Falevits A Dunlop C Phillips D Melendez Colon E Sanchez Santiago |
| CCA | H.12, Avoid Complacency |
| INPO aspect | QA.4 |
| ' | |
Finding - Dresden - IR 05000237/2011005 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Dresden) @ 2011Q4
Self-Identified List (Dresden)
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