ML20236U316

PN-75-023:on 750512,unplanned Released of Radioactive Liquids Occurred at Plant Unit 1.Pump Apparently Ran Until Resin Vault Was Emptied,Overflowing Contractor Tank & Going Into Intake Canal Via Drainage Ditch

ML20236U316
Person / Time
Site:	Dresden
Issue date:	05/13/1975
From:	Jennifer Davis, Thornburg H, Warnick R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
To:
References
PN-75-023, PN-75-23, NUDOCS 9807300041
Download: ML20236U316 (1)

Text

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(M1p PRELIMINARY NOTIFICATION - NOT FOR PUBLIC DISCLOSURE f' May 13, 1975

{ PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE -- PN-75-23 This preliminary notification constitutes EARLY notice of events of j POSSIBLE safety or public interest significance. The information presented is as initially received without verification or evaluation and is basically all that is known by OIE staff as of 10:00 a.m. on date of this notification. IT SHOULD BE SPECIFICALLY NOTED THAT THIS NOTIFICATION MAY CONTAIN INFORMATION THAT LATER MAY BE DETERMINED TO BE INACCURATE OR INCONSISTENT. AN OFFICE OF INSPECTION AND ENFORCEMENT NOTIFICATION OF AN INCIDENT OR OCCURRENCE (BLUE SHEET) S BSEQUENTLY

. .YILL BE ISSUED IF WARRANTED.

I "e' '

- Facility: -Dresden Unit 1, Commonwealth Edison Company l

Subject:

INADVERTENT DISCHARGE OF LIQUID RADUASTE I Commonwealth Edison Company notified the Office of Inspection and i Enforcement, Region III, at about 4:00 p.m., on May 12, 1975, that I an unplanned release of radioactive liquids had occurred at Dresden 1.

l The release was apparently initiated between 2000 hours0.0231 days <br />0.556 hours <br />0.00331 weeks <br />7.61e-4 months <br /> on May 9, 1975, {

and 0800 hours0.00926 days <br />0.222 hours <br />0.00132 weeks <br />3.044e-4 months <br /> on May 10, 1975, by inadvertent starting of a, pump which transfers liquid radwaste from the Unit I resin vault to the radwaste gy. ;

- contractor's treatment facility. The pump apparently ran until the resin "

vault was emptied, overflowing the contractor's tank and finding its i l vay to the Unit 1 intake canal via a drainage ditch. The licensee did '

( not become aware of the event until the morning of May 12, 1975.

The licensee estimates a total discharge of 19,500 gallons at an activity level of 0.012 uCi/ml, or a total discharge of approximately 0.9 curies. The licensee also stated that the concentration did not exceed Techni' cal Specifications or 10CFR20 limits.

Inspectors have been dispatched to the site to evaluate the occurrence.

Contact:

RFWarnick, IE x7261, HDThornburg, IE x7353, JGDavis, IE x7541 l Distribution:

Chairman Anders Commissioner Mason S. J. Chilk, SECY '

Commissioner Gilinsky Commissioner Rowden G. F. Murphy, JCAE Commissioner 1(ennedy, , C. C. Kammerer, CA T. J. McTiernan, AIA B. Huberman, PE ~ ~

1 L. V. Gossick, EDO D. F. .a th, IE J. A. Harris, PA B. C. Rusche, NRR H. H. Brown, ISP 6/

K. R. Chapman, NMSS H. K. Shapar, ELD -

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• Transmitted: P Bldg /88% ; H St /A d c'% ; MD Bldg / [ i'd h L -

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l PRELIMINARY NOTIFICATION - NOT FOR PUBLIC DISCLOSURE 9807300041 750513 PDR I&E l

L_________._

PN-75-023 PDR