05000336/LER-1980-026-01, /01T-0:on 800729,plugged Yard Storm Drain Caused Rainwater Backup & Leakage of 18 Inches in Lower Level of Auxiliary Bldg.Caused by Faulty Water Seals for Piping Penetrations Into Refueling Water Storage Tank Tunnel

/01T-0:on 800729,plugged Yard Storm Drain Caused Rainwater Backup & Leakage of 18 Inches in Lower Level of Auxiliary Bldg.Caused by Faulty Water Seals for Piping Penetrations Into Refueling Water Storage Tank Tunnel

ML19331C779
Person / Time
Site:	Millstone
Issue date:	08/12/1980
From:	Criscione J NORTHEAST NUCLEAR ENERGY CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19331C774	List: 05000336/LER-1980-026, Forwards LER 80-026/01T-0 05000336/LER-1980-026-01, /01T-0:on 800729,plugged Yard Storm Drain Caused Rainwater Backup & Leakage of 18 Inches in Lower Level of Auxiliary Bldg.Caused by Faulty Water Seals for Piping Penetrations Into Refueling Water Storage Tank Tunnel
References
LER-80-026-01T, LER-80-26-1T, NUDOCS 8008190522
Download: ML19331C779 (2)

LER-1980-026, /01T-0:on 800729,plugged Yard Storm Drain Caused Rainwater Backup & Leakage of 18 Inches in Lower Level of Auxiliary Bldg.Caused by Faulty Water Seals for Piping Penetrations Into Refueling Water Storage Tank Tunnel

Event date:
Report date:
3361980026R01 - NRC Website

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S 60 61 DOCKET NUVUER f.8 63 EVE NT DATE 74 75 HEPORT DATE 80 EVENT DESCHIPTlofJ AND PROBABLE CONSEQUENCES h gl As a result of the engineering investigation of rainwater inleakage to the Auxiliary I

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Building during the storm of July 29, 1980 it has been determined that the water seal I

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for the piping penetrations in the refueling water storage tank pipe tunnel does not i

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inches of standing water in the lower level of the Auxiliary Building.

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....o ATTACHMENT LER 80-26/17-0 Millstone Unit 2 Docket No. 50-336 Event Description and Probable Consequences:

As a result of the engineering investigation of rainwater inleakage to the Auxiliary Building during the stonn of July 29, 1980 it has been determined that the water seal for the piping penetrations in the refueling water storage tank pipe tunnel does not meet the design required by Technical Specification 5.1.3.

A plugged yard storm drain caused a water backup and the mentioned inleakage resulted in approximately eighteen inches of standing water in the lower level of the Auxiliary Building.

No safety related equipment was jeopardized as a result of this rainwater inleakage.

Cause Description and Corrective Action The cause of the rainwater inleakage was faulty water seals for piping penetrations into the refueling water storage ' tank pipe tunnel. An examination was also performed on the condensate storage tank and service water pipe tunnels for similar faulty seals.

Permanent or tanporary seals (pending further Architect Engineer permanent resolution) have been provided for all exterior pipe penetrations to provide flood protection.

All insulation on piping wetted by the rainwater will be removed and the stainless steel piping cleaned with demineralized water and new insulation reins talled. This insulation replacement program is currently working.

The Safeguards Rooms in -45 elevation of the Auxiliary Buildings experienced minor inleakage. The door gaskets to each room were examined and door adjustments made to correct inleakage.