05000237/FIN-2009005-04
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Finding | |
|---|---|
| Title | 2/3 Emergency Diesel Generator (EDG) Overvoltage During Division I Undervoltage Surveillance |
| Description | The inspectors identified an URI regarding the regulatory requirements associated with the circumstances surrounding the 2/3 EDG overvoltage event on November 16, 2009. On November 16, 2009, at 10:53 a.m., a nuclear station operator (NSO) was performing step I.11.c per DOS 6600-06, Bus Undervoltage and ECCS Integrated Functional Test for Unit 2/3 Diesel Generator to Unit 2, Revision 46. At this time, the operator was attempting to synchronize Bus 23-1 (powered from 2/3 EDG) to Bus 23 (powered from reserve auxiliary transformer 22). The operator stated that he was only monitoring running versus on-coming bus voltage meters, which are transformed down and are only relative to actual bus voltages. The operator stated that a loud pop noise was heard from the 902-3 panel. At this time, the operator noticed that the 23-1/24-1 digital volt meter read around 5600 volts (was previously around 4100 volts). The 2/3 EDG was then shutdown per DOS 6600-06 step I.12. On step I.12.c, the voltage regulator would not lower (remained upscale). The EDG stopped after the 6-minute cool down and DOS 6600-06 was stopped. The licensee generated EACE 994101-07, 2/3 Emergency Diesel Generator (EDG) Voltage Transient, to determine the cause, extent of condition and corrective actions for this event. The inspectors reviewed EACE 994101-07 and interviewed the NSO who had performed DOS 6600-06. The inspectors raised more questions regarding the capabilities of the control room simulator used for training, procedure adequacy and the corrective actions in place. The inspectors plan to review the licensees response to their questions to determine if there were any violations of NRC requirements and that appropriate corrective actions were applied. (URI 05000237/2009005-04; 05000249/2009005-04 |
| Site: | Dresden  |
|---|---|
| Report | IR 05000237/2009005 Section 1R19 |
| Date counted | Dec 31, 2009 (2009Q4) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.19 |
| 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 Russellr Jicklingc Moore C Phillips D Melendez Colon D Sand F Ramirez J Benjamin J Draper J Mcghee L Kozak M Holmberg M Mitchell M Ring |
| INPO aspect | |
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Finding - Dresden - IR 05000237/2009005 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Dresden) @ 2009Q4
Self-Identified List (Dresden)
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