ML20202H404

Informs That Land Use Census Identified Location Which Yields Calculated Dose Greater than Values Currently Calculated,Per Section 5.2.1,Action B.1 of ODCM

ML20202H404
Person / Time
Site:	San Onofre
Issue date:	12/05/1997
From:	Medling E SOUTHERN CALIFORNIA EDISON CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 9712100272
Download: ML20202H404 (2)

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December 5, 1997 U. S Nuclear Regulatory Commission Attention: Document Contrul Desk Washington, D.C.

20555 Gentlemen:

Sub,iect:

Docket No. 50-206 Special 30-Day Report P.adiological Environmental Opeiating Report San Onofre Nuclear Generating Station, Unit 1 Offsite Dose Calculation Manual (ODCM), Section 5.2.1, Action B.1 for San Onofre Unit 1 Facility Operating (Possession Only) License No. DPR-13 requires a 30-day written report'when the land use census identifies a location which yields a calculated dose greater than the values currently calculated.

The analysis of land use census data performed on November 18, 1997 indicated a dose greater than the dcse currently calculated. Tho newly identtfied location, where outage support workers resided in campers, is Parking Lot 4A in Sector Q at 0.5 miles from the Unit I release point. The calculated annual radiation dose was 1.2 x 10 mrem due to Unit 1 airborne effluents.

This was an increase of 22% over the value currently calculated for the receptor at San I

Onofre Mobile Home Park (9.87 x 105 mrem), at 1.2 miles in the same Sector, Q.

The increased dose resulted from the combination of the occupancy for Parking Lot 4A-(due to the long duration of the Unit 2 and Unit 3 Cycle 9 jU refueling outages) and the close proximity of the Parking Let to Unit 1.

The I

calculated dose at Parking tot 4A duo to Units 2/3 airborne releases did not exceed the currently calculated dose at Saa Onofre Mobile Home Park.

Detailed' dose calculations indicated there is no need to add any sampling locationsaccordingto00CMrequirementsforUnit1orUnits2/3.

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If you require any-additional infortnation, please advise.

Sincerely, jf v Y cc:

E. W. Merschoff, Regional Administrator.NRC Region IV K. E. Perkins, Jr., Director, Walnut Creek Field Office, NRC Region IV M. K. Webb, NRC Project Manager, San Onofre Unit 1 H. B. Fields, NRC Project Manager, San Onofre Units 2 and 3 L. C. Carson, Regional Project Inspector, San Onofre Unit 1 J. A. Sloan, NRC Senior Resident Inspector, San Onofre Units t & 3 S. S. Bajwa, Section Chief, Deconnissioning Section L. Brown, California Department of Health Services

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