ENS 49918

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v t e ENS Event
18:30 Mar 14, 2014
Title	High Pressure Fire Water Systems Declared Inoperable
Event Description	On 3/14/2014 at 1330 hours0.0154 days <br />0.369 hours <br />0.0022 weeks <br />5.06065e-4 months <br />, the Plant Shift Superintendent was notified by Fire Services that adequate pressure could not be verified during post maintenance testing of an inoperable High Pressure Fire Water System for the C-335 building. During investigation into the issue, it was discovered that eleven operable High Pressure Fire Water Systems were also impacted. The facility is in TSR mode three as all cells have been sampled UF6 negative and the cell motors are not energized. In this mode, the High Pressure Fire Water Systems are still required to be operable per TSR 2.4.4.6; however, due to inadequate pressure, the eleven systems may not have been able to perform the intended safety function. The eleven operable High Pressure Fire Water Systems were declared inoperable and hourly fire patrols were initiated according to TSR LCO 2.4.4.5.9.1 at 1520 hours0.0176 days <br />0.422 hours <br />0.00251 weeks <br />5.7836e-4 months <br /> on 3/14/2014. On 2/26/2014 at 1212 hours0.014 days <br />0.337 hours <br />0.002 weeks <br />4.61166e-4 months <br />, three High Pressure Fire Water System Sectional Valves were isolated and declared inoperable in order to isolate a section of header which contained a small leak. Isolating these valves resulted in a single supply to twelve High Pressure Fire Water Systems in C-335. Upon investigation of the lack of pressure, it was determined that the sectional supply valve in the remaining supply loop was not operating as designed and is suspected to be the cause of the restricted water flow. Sectional supply valves that had been used for isolation of the small leak have been opened to provide unrestricted flow to the affected sprinkler systems. Following the confirmation of adequate flow, the sprinkler systems were declared operable and the hourly fire patrols were discontinued at 1739 hours0.0201 days <br />0.483 hours <br />0.00288 weeks <br />6.616895e-4 months <br /> on 3/14/2014. The small leak will be monitored until repairs can be initiated or the leak becomes unmanageable. At that point TSR LCO actions will be entered as necessary. This event is reportable as a 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> 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 Region II (Marvin Sykes) has been notified of this event via voice mail.

ENS 49918 +/-
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:+17.03 h0.71 days <br />0.101 weeks <br />0.0233 months <br />)
Opened:	Ron Dockery 11:32 Mar 15, 2014
NRC Officer:	Pete Snyder
Last Updated:	Mar 15, 2014
49918 - NRC Website
v • d • e

v t e Emergency Notification System
Paducah Gaseous Diffusion Plant with 10 CFR 76.120(c)(2)
WEEKMONTHYEAR2014-05-08T15:24:00 [Table view]
[ENS list for Paducah Gaseous Diffusion Plant]

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