PNO-I-89-013, on 890224,licensee Identified Unmonitored Release Path from Uncontrolled Spent Fuel Bldg Drain Through Switchyard Drain Sys.Caused by Radwaste Water Being Erroneously Discharged Into Floor Drain.Drain Plugged

PNO-I-89-013:on 890224,licensee Identified Unmonitored Release Path from Uncontrolled Spent Fuel Bldg Drain Through Switchyard Drain Sys.Caused by Radwaste Water Being Erroneously Discharged Into Floor Drain.Drain Plugged

ML20235Q158
Person / Time
Site:	Haddam Neck File:Connecticut Yankee Atomic Power Co icon.png
Issue date:	02/24/1989
From:	Mccabe E, Shedlosky T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
To:
References
PNO-I-89-013, PNO-I-89-13, NUDOCS 8903020515
Download: ML20235Q158 (1)

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! a DCS No: 50213890224

, .c Date: February 24,.1989 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-I-89-013 This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public interest significance. The information is as initially received without verification or evaluation, and is basically all that is known by the Region I staff on this date.

Facility: Licensee Emergency Classification:

Connecticut Yankee Atomic Power X Notification of Unusual Event Company Alert Haddam Neck Plant Site Area Emergency Docket No. 50-213 General Emergency PWR/ Westinghouse 4 Loop Not Applicable

Subject:

UNMONITORED RADI0 ACTIVE LIQUID RELEASE PATH The licensee has identified an unmonitored release path from an uncontrolled Spent Fuel Building drain through the switchyard drain system to a marshy part of the owner-controlled area just outside the protected area. Identification occurred in the a.m. on February 24 when, during routine survey, a radiation technician detected contamination immediately outside the Radiologically Controlled Area fence. Further investigation identified surface contamination in the drain troughs in the switchyard and soil contamination in the marshy area (about 500 square yards) where the drains discharge. Water from this area flows into the plant discharge canal, where it is diluted by 384,000 gpm discharge flow.

About fifty (50) gallons of water had been removed from drums containing Reactor Containment sump sludge four weeks ago. Apparently, that radioactive waste water was discharged into what was erroneously thought to be a Spent Fuel Building floor drain to radioactive waste. The licensee is attempting to quantify the amount of radioactive saterial released.

The floor drain har been plugged. The licensee has controlled access to the affected areas and is taking soil samples.

Licensee reports were made to NRC and the State of Connecticut.

The resident inspectors are monitoring the licensee's actions.

CONTACT: T. Shediosky E. McCabe (203) 267-2571 FTS 346-5231 DISTRIBUTION:

OWFN MNBB H-St. NL Mail: ADM:DMB Chairman Zech AE0D ACRS RES DOT:Trans only Comm. Roberts ARM POR Comm. Carr OGC NRC Ops Ctr Comm. Rogers Comm. Curtiss INPO----

SECY NMSS NSAC----

CA NRR i OGC OIA Regional Offices l GPA 01 RI Resident Office PA SLITP EDO OE Licensee:

(Reactor Licensees) <N Rrgion I Form 83 -

(Rev. April 1988) #$, f'j[ i ' ' 'v.; ~ 4 gj NJ + ' .g , (

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