ENS 45890

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v t e ENS Event
15:15 Apr 30, 2010
Title	Tar Found on Overpressure Rupture Discs Potentially Changing the Relief Set Point
Event Description	On 04/30/10 the Plant Shift Superintendent (PSS) was notified that while performing maintenance on C-337 Unit 2 Cell 4 Odd R-114 rupture disc replacement, roofing tar was discovered in the upper rupture disc. C-337 U/2 C/4 Odd system was not in a mode of applicability according to TSR [Technical Safety Requirement] 2.4.3.4. The presence of the roofing tar on an operable R-114 coolant overpressure control system rupture disc would not allow the rupture disc to perform its intended safety function as required by TSR 2.4.3.4. The R-114 rupture disc is the primary component of the R-114 coolant overpressure control system. The R-114 coolant overpressure control system prevents excess coolant pressure from rupturing the coolant system and releasing coolant into the UF6 primary system that could result in the subsequent release of UF6 due to over pressurization of the UF6 system. TSR 2.4.3.4 and 2.3.3.2 require that the R-114 coolant overpressure control system be operable. An extent of condition inspection of in use R-114 rupture discs is in progress. Roofing tar was discovered on R-114 coolant overpressure control system rupture discs in the following locations: C-337 cells U/3 C/2 Odd, U/1 C/5 Odd, U/1 C/6 Odd, U/6 C/4 Odd, U/2 C/5 Even, U/5 C/4 Odd, U/5 C/6 Even, U/5 C/8 Odd, U/4 C/7 Even (Not in an applicable mode), U/2 C/4 Odd (Not in an applicable mode). U/6 C/7 Odd (Not in an applicable mode). C-331 U/1 C/4 (Not in an applicable mode). Buildings C-310 and C-335 R-114 coolant overpressure control system rupture discs were inspected and were free of any foreign material. Systems that are in an applicable mode according to TSR 2.4.3.4 and were discovered to have roofing tar on the rupture discs were declared inoperable and an operator was stationed to continuously monitor the R-114 pressure in order to take action according to TSR 2.4.3.4. 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 10 CFR 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. PGDP Assessment and Tracking Report No. ATRC-l0-1131; PGDP Event Report No. PAD-2010-6 * * UPDATE FROM JOE BARLETTO TO HOWIE CROUCH @ 2254 EDT ON 5/1/10 * * * On 05-01-2010 at 2225 hours0.0258 days <br />0.618 hours <br />0.00368 weeks <br />8.466125e-4 months <br />, extent of condition walk downs have been completed. Additional R-114 rupture disc locations were discovered with either roofing tar and/or shipping caps in the upper rupture disc. The presence of either would not allow the R-114 rupture disc to perform its intended safety function as required by TSR 2.4.3.4. Systems that are in an applicable mode according to TSR 2.4.3.4 and were discovered to have roofing tar and/or shipping caps on the upper rupture discs were declared inoperable and an operator was stationed to continuously monitor the R-114 pressure in order to take action according to TSR 2.4.3.4." The licensee provided a list of 28 cells that had shipping caps installed and 13 cells with roofing tar on the discs. The NRC Senior Resident Inspector has been notified of this event. * * UPDATE FROM ROD COOK TO JOHN KNOKE @ 1737 EDT ON 5/2/10 * * * On 5/02/2010 at 0636 hours0.00736 days <br />0.177 hours <br />0.00105 weeks <br />2.41998e-4 months <br /> during a review of the extent of condition inspection notes, engineering identified that C-333 U/4 C/9 Even R-114 Over-pressurization system had been omitted from the report due to oversight. Engineering had identified a shipping cover with tar on it was present on the rupture disc. The NRC Senior Resident Inspector has been notified of this event. PGDP Assessment and Tracking Report No. ATRC-10-1141; PGDP Event Report No. PAD-2010-6. Responsible Division: Operations Notified R2 DO (Randy Musser) and NMSS EO (Tim McCartin)

ENS 45890 +/-
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:+17.52 h0.73 days <br />0.104 weeks <br />0.024 months <br />)
Opened:	Rod Cook 08:46 May 1, 2010
NRC Officer:	Dong Park
Last Updated:	May 1, 2010
45890 - 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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