PNO-II-89-063, on 890905,spill of Approx 10,000 Gallons of Contaminated Water Into Auxiliary Bldg Occurred.Caused by Overpressurization of Primary Sys Pressure Allowed to Pressurize Train a Containment Designed for 220 Psi

PNO-II-89-063:on 890905,spill of Approx 10,000 Gallons of Contaminated Water Into Auxiliary Bldg Occurred.Caused by Overpressurization of Primary Sys Pressure Allowed to Pressurize Train a Containment Designed for 220 Psi

ML20247D371
Person / Time
Site:	Mcguire
Issue date:	09/06/1989
From:	Shymlock M NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
To:
References
PNO-II-89-063, PNO-II-89-63, NUDOCS 8909140224
Download: ML20247D371 (1)

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s. -

. September 6, 1989

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PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCU'RRENCE PNO-II-89-63 This prel'iminary notification constitutes EARLY notice of events of POSSIBLE safety or i public. interest significance. The information is as initially received without verifi-cation or evaluation, and is basically all that is known by the Region II staff on this date.

FACILITY: Duke Power Company Licensee Emergency Classification:

McGuire . Notification of Unusual Event Docket No. 50-370 Alert Huntersville, NC Site Area Emergency General Emergency

,_ X Not Applicable

SUBJECT:

AIT DISPATCHED TO MCGUIRE NUCLEAR POWER STATION The NRC is dispatching an augmented inspection team (AIT) to McGuire Nuclear Power Station to investigate an overpressurization of the containment spray system which resulted in a spill' of approximately 10,000 gallons of contaminated water into the Auxiliary Building.

The plant was shut down for refueling (Mode 5) and the reactor was being cooled with the Nuclear Decay Heat Removal System. This event occurred on September 5,1989, around 4:10.p.m. The team will be on site the morning of September 7, 1989.

It appears that due to an inappropriate valve lineup, an intersystem LOCA occurred. The primary system pressure (325 psi) was allowed to pressurize the train "A" Containment Spray System which caused the associated heat exchanger bottom flange' gasket to fail, since the Containment Spray System is designed for 220 psi. This gasket leaked for approximately one hour and allowed about 10,000 gallons of water to spill into the Auxiliary Building.

The State of North Carolina has been informed.

This PN is being issued for information purposes only.

This information is current as of September 6,1989.

CONTACT: M. Shymlock - 841-4196 DISTRIBUTI_0]i:

One White M' land Nat'l Flint North Bank Bldg Regions MAIL T0:

Chairman Carr ARM Region I DCS(Transportation D0T (Original IE 34)

O dly)

Comm. Roberts OIA Region II Comm. Rogers AE0D Region III FAX T0: INPO M@

Comm. Curtiss Region IV LICENSEE (Corporate) -/// S%

Y Region V RII Resident .- gj g OCA Nicholson Lane GPA/SLITP/PA RES ED0 01 NRR H Street NMSS PDR ACRS

%8'%h I 5520: 09/07/89 @ 8:30 a.m. TO REGIONS AND HQ 0 1

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8909140224 890906 N-II$9-063 PDC ,

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