PNO-III-87-084A, on 870618,approx 235 Gallons of Unit 1 Water Discharged Into Lake Michigan Through Unit 2 Svc Water Discharge.Caused by Presence of Entrained Noble Gases. Calculations Verified by Resident Inspectors

PNO-III-87-084A:on 870618,approx 235 Gallons of Unit 1 Water Discharged Into Lake Michigan Through Unit 2 Svc Water Discharge.Caused by Presence of Entrained Noble Gases. Calculations Verified by Resident Inspectors

ML20216C175
Person / Time
Site:	Point Beach
Issue date:	06/24/1987
From:	Defayette R, Hague R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
To:
References
PNO-III-87-084A, PNO-III-87-84A, NUDOCS 8706300232
Download: ML20216C175 (1)

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PRELIMINARY NOTIFICATION OF EVENT OR: UNUSUAL OCCURRENCE--PHO-III-87-84A Date: June 24, 1987 l

'This preliminary notification corstitutes EARLY notice of events of POSSIBLE safety or public

' inter st significance. The information is as initially received without verification or evaluation, and is basically all that is known by the Region Ill staff on this date.

Facility

Wisconsin Electric Power Company Licensee Emergency Classification:

Point Beach Units 1 & 2 Notification of an Unusual Event Two Rivers, WI 54241 Alert Site Area Emergency Docket No. 50-266; 50-301 General Emergency

_X_Not Applicable

Subject:

RELEASE OF PRIMARY COOLING WATER INTO LAKE MICHIGAN (UPDATE)

On June 18, 1987, approximately 235 gallons of Unit I reactor cooling water was discharged j into Lake Michigan through the Unit 2 service water discharge. Preliminary indications were l that the release exceeded the Technical Specification discharge limit. 1 After analyzing the actual activity of- the primary cooling water that was discharged during this event, the licensee determined that the cause of the alarm on the service water dischargemonitorwasduetothepresenceofentrainednobggases. The alarm setpoint is basedonthemaximumpermissibleconcentration(MPC)obOCo in the effluent path. The analysis of the actual water discharged indicates a Co equivalent activity of less than 3% '

MPC. The activity of the noble gases entrained in the discharged water was several magnitudes higher than the liquid activity. Using the applicable formula for the noble gas '

release it was calculated that an individual in the vicinity of the discharge pier would have received a whole body exposure of .06 mrem. This is 3% of the hourly exposure limit for an unrestricted-area.

The licensee's calculations were verified by the resident inspectors and the licensee's '

analysis results will be confirmed by the use of split samples sent to Region III for independent verification.

The State of Wisconsin will be notified.

There has been local news media interest in this event.

This information is current as of 11:00 a.m. (CDT), June 24, 1987.

CONTACT: R. DeFayette R.L. Hague 312/790-5767 414/755-2309 DISTRIBUTION:

H. St. EDO NRR E/W Willste Mail: ADM:DMB Chairman Zech PA IE NMSS D0T:Trans only Comm. Roberts ELD OIA RES Comm. Asselstine AEOD NRC Ops Ctr Comm. Bernthal Comm. Carr SP Regional Offices ACRS SECY INP0 NSAC CA RIII Resident Office Licensee: (Corp. Office - Reactor Lic. Only)

Region III Rev. November 1986 g63 32 870624r PNO-III-07-084 PDR N p,1-