ENS 41223: Difference between revisions
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| event date = 11/23/2004 13:25 CST | | event date = 11/23/2004 13:25 CST | ||
| last update date = 11/24/2004 | | last update date = 11/24/2004 | ||
| title = Failure | | title = Failure of Uf6 Release Detection System Due to Loss of Electrical Power | ||
| event text = At 1325 [CST] on 11-23-04, the Plant Shift Superintendent (PSS) was notified of a failure of the C-310 High Voltage UF6 Release Detection System. The High Voltage UF6 detection system was disabled due to loss of power. Power was lost when a circuit breaker was tripped to de-energize an auxiliary substation that faulted and caused a fire. This High Voltage UF6 Release System is designed to activate alarms to alert operators in the event of a UF6 release. The PSS declared the system inoperable and TSR LCO 2.3.4.4.A actions were implemented to post a continuous smoke watch in the affected area. The event is reportable as a 24 hour event, as required by 10 CFR 76.120(c)(2)(i); An event in which equipment is disabled or fails to function as designed when the equipment is required by a TSR to prevent releases, prevent exposures to radiation and radioactive materials exceeding specified limits, mitigate the consequences of an accident, or restore this facility to a preestablished safe condition after an accident. The equipment was required by TSR to be available and operable and no redundant equipment was available to perform the required safety function. | | event text = At 1325 [CST] on 11-23-04, the Plant Shift Superintendent (PSS) was notified of a failure of the C-310 High Voltage UF6 Release Detection System. The High Voltage UF6 detection system was disabled due to loss of power. Power was lost when a circuit breaker was tripped to de-energize an auxiliary substation that faulted and caused a fire. This High Voltage UF6 Release System is designed to activate alarms to alert operators in the event of a UF6 release. The PSS declared the system inoperable and TSR LCO 2.3.4.4.A actions were implemented to post a continuous smoke watch in the affected area. The event is reportable as a 24 hour event, as required by 10 CFR 76.120(c)(2)(i); An event in which equipment is disabled or fails to function as designed when the equipment is required by a TSR to prevent releases, prevent exposures to radiation and radioactive materials exceeding specified limits, mitigate the consequences of an accident, or restore this facility to a preestablished safe condition after an accident. The equipment was required by TSR to be available and operable and no redundant equipment was available to perform the required safety function. | ||
In addition, the loss of power caused the Low Voltage UF6 Detection System to isolate the C-310 withdrawal positions as designed. The substation fault and subsequent fire did not result in a release of radioactive material. | In addition, the loss of power caused the Low Voltage UF6 Detection System to isolate the C-310 withdrawal positions as designed. The substation fault and subsequent fire did not result in a release of radioactive material. | ||
Revision as of 22:22, 1 March 2018
| Where | |
|---|---|
| Paducah Gaseous Diffusion Plant Paducah, Kentucky (NRC Region 2) | |
| License number: | Gdp-1 |
| Reporting | |
| 10 CFR 76.120(c)(2) | |
| Time - Person (Reporting Time:+18.23 h0.76 days <br />0.109 weeks <br />0.025 months <br />) | |
| Opened: | Calvin Pittman 13:39 Nov 24, 2004 |
| NRC Officer: | Mike Ripley |
| Last Updated: | Nov 24, 2004 |
| 41223 - NRC Website | |