Flood Barriers At Fort Calhoun Found To Be Leaking – Fittings thought to be capped found to be open with a sheet metal box obscuring inspections

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Power Reactor Event Number: 47359
Facility: FORT CALHOUN
Region: 4 State: NE
Unit: [1] [ ] [ ]
RX Type: (1) CE
NRC Notified By: ERICK MATZKE
HQ OPS Officer: VINCE KLCO
Notification Date: 10/20/2011
Notification Time: 13:46 [ET]
Event Date: 10/20/2011
Event Time: 10:50 [CDT]
Last Update Date: 10/20/2011
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(v)(B) – POT RHR INOP
50.72(b)(3)(v)(D) – ACCIDENT MITIGATION
Person (Organization):
MARK HAIRE (R4DO)
Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode
1 N N 0 Cold Shutdown 0 Cold Shutdown

Event Text

FLOOD BARRIER PENETRATIONS NOT WATER TIGHT

“During follow-up inspections of flood barrier penetrations into two rooms in the plant it was determined that some of the water tight conduit fittings were not filled with the material required to make them water tight. Inspection caps were removed from the fittings to perform the inspections. Three fittings into room 19 (auxiliary feedwater and plant air compressors) and fittings into room 56E (electrical switchgear) were found to contain no filling material. One additional fitting into room 56E that was thought to be capped was found to be open with a sheet metal box covering the inside access thereby obscuring inspections.

“All of the affected penetrations have modifications in progress to assure that they are modified and qualified for design basis flood levels.

“Of the 16 penetrations 6 have been verified to be made water tight by other means, specifically fire foam barrier installed in the conduit from the room 56E side.

“The remaining 10 penetrations will leak with a 1014 flood, although the plate will restrict flow to some degree. The stations auxiliary feedwater and safety related electrical switch gear could be affected.

“This eight-hour notification is being made pursuant to 10CFR50.72 (b)(3)(v).”

Source: www.nrc.gov, via Enformable
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