ENS 44356: Difference between revisions
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| event date = 07/20/2008 12:20 CDT | | event date = 07/20/2008 12:20 CDT | ||
| last update date = 07/20/2008 | | last update date = 07/20/2008 | ||
| title = Failure | | title = Failure of Process Gas Leak Detection System | ||
| event text = At 1230 CDST, on 07-20-08 the Plant Shift Superintendent (PSS) was notified that C-315 had received an audible alarm with no visual indications. Moments later an alarm was received in C-331 for the C-315 High Voltage Process Gas Leak Detection System. Operators responded by contacting C-315 to inquire about the alarm. C-315 operators checked the system and found that the READY light for this system was not illuminated. This PGLD System contains detectors that cover the C-315 UF6 condensers, accumulators, and piping heated housing. At the time of this alarm, the areas were operating above atmospheric pressure. TSR 2.3.4.4 requires that all of detector heads in this system be operable during operations above atmospheric pressure. Operators responding to the system tried to test fire the system heads however the system would not respond and then they discovered the READY light to be off. This PGLD System was declared inoperable, TSR LCO 2.3.4.4.A.1 was entered and a continuous smoke watch was put in place within one hour. Engineering has determined that the system would not have been able to perform its intended safety function when this alarm came in. This event is reportable as a 24 hour event in accordance with 10CFR 76.120 (c)(2)(i). This is an event in which equipment is disabled or fails to function as designed when: a.) 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 pre-established safe condition after an accident; b.) the equipment is required by a TSR to be available and operable and either should have been operating or should have operated on demand, and c.) no redundant equipment is available and operable to perform the required safety function. | | event text = At 1230 CDST, on 07-20-08 the Plant Shift Superintendent (PSS) was notified that C-315 had received an audible alarm with no visual indications. Moments later an alarm was received in C-331 for the C-315 High Voltage Process Gas Leak Detection System. Operators responded by contacting C-315 to inquire about the alarm. C-315 operators checked the system and found that the READY light for this system was not illuminated. This PGLD System contains detectors that cover the C-315 UF6 condensers, accumulators, and piping heated housing. At the time of this alarm, the areas were operating above atmospheric pressure. TSR 2.3.4.4 requires that all of detector heads in this system be operable during operations above atmospheric pressure. Operators responding to the system tried to test fire the system heads however the system would not respond and then they discovered the READY light to be off. This PGLD System was declared inoperable, TSR LCO 2.3.4.4.A.1 was entered and a continuous smoke watch was put in place within one hour. Engineering has determined that the system would not have been able to perform its intended safety function when this alarm came in. This event is reportable as a 24 hour event in accordance with 10CFR 76.120 (c)(2)(i). This is an event in which equipment is disabled or fails to function as designed when: a.) 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 pre-established safe condition after an accident; b.) the equipment is required by a TSR to be available and operable and either should have been operating or should have operated on demand, and c.) no redundant equipment is available and operable to perform the required safety function. | ||
The NRC Resident Inspector has been notified of this event. | The NRC Resident Inspector has been notified of this event. | ||
Revision as of 22:14, 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:+1.67 h0.0696 days <br />0.00994 weeks <br />0.00229 months <br />) | |
| Opened: | Billy Wallace 19:00 Jul 20, 2008 |
| NRC Officer: | Bill Huffman |
| Last Updated: | Jul 20, 2008 |
| 44356 - NRC Website | |