ENS 43670: Difference between revisions
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| event date = 09/27/2007 00:12 CDT | | event date = 09/27/2007 00:12 CDT | ||
| last update date = 09/27/2007 | | last update date = 09/27/2007 | ||
| title = Temporary Loss | | title = Temporary Loss of Smoke Detector Function | ||
| event text = At 0012 CDST, on 9-27-07 the Plant Shift Superintendent (PSS) was notified that an alarm was received for the C-333 Unit 6 Cell 4 UF6 Release Detection (PGLD) System. Operators responded and found that the READY and MANUAL lights for this system were not illuminated. This PGLD System contains detectors that cover C-333 Unit 6 Cell 4 and Section 2 of the cell bypass piping. At the time of this alarm, some areas of Section 2 of the cell bypass were operating above atmospheric pressure. TSR 2.4.4.1 requires that at least the minimum number of detector heads in each defined section of the cell bypass are operable during steady state operations above atmospheric pressure. With the Unit 6 Cell 4 PGLD system inoperable, only 2 of the required 3 heads in Section 2 of the cell bypass were operable. This PGLD System was declared inoperable, TSR LCO 2.4.4.1.C.1 was entered and a continuous smoke watch was put in place within one hour. Maintenance investigated and determined that two detector heads had shorted to ground which caused this alarm. Engineering has determined that the system would not have been able to perform its intended safety function when this alarm came in. The shorted heads were replaced and the GLD System was declared operable at 0350 hours on 9-27-07 following repairs and testing. 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 o demand, and c.) no redundant equipment is available and operable to perform the required safety function. | | event text = At 0012 CDST, on 9-27-07 the Plant Shift Superintendent (PSS) was notified that an alarm was received for the C-333 Unit 6 Cell 4 UF6 Release Detection (PGLD) System. Operators responded and found that the READY and MANUAL lights for this system were not illuminated. This PGLD System contains detectors that cover C-333 Unit 6 Cell 4 and Section 2 of the cell bypass piping. At the time of this alarm, some areas of Section 2 of the cell bypass were operating above atmospheric pressure. TSR 2.4.4.1 requires that at least the minimum number of detector heads in each defined section of the cell bypass are operable during steady state operations above atmospheric pressure. With the Unit 6 Cell 4 PGLD system inoperable, only 2 of the required 3 heads in Section 2 of the cell bypass were operable. This PGLD System was declared inoperable, TSR LCO 2.4.4.1.C.1 was entered and a continuous smoke watch was put in place within one hour. Maintenance investigated and determined that two detector heads had shorted to ground which caused this alarm. Engineering has determined that the system would not have been able to perform its intended safety function when this alarm came in. The shorted heads were replaced and the GLD System was declared operable at 0350 hours on 9-27-07 following repairs and testing. 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 o demand, and c.) no redundant equipment is available and operable to perform the required safety function. | ||
The licensee notified the NRC Resident Inspector. | The licensee notified the NRC Resident Inspector. | ||
Revision as of 22:15, 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:+10.83 h0.451 days <br />0.0645 weeks <br />0.0148 months <br />) | |
| Opened: | M. C. Pittman 16:02 Sep 27, 2007 |
| NRC Officer: | Mark Abramovitz |
| Last Updated: | Sep 27, 2007 |
| 43670 - NRC Website | |