ML20217P770

Provides Results of Calculations Performed to Evaluate Dose to Public to Be Expected from Hypothetical Spill of Tritiated Water Being Stored in SNEC Facility Containment Vessel.Scenarios Found to Have No Significant Public Health

ML20217P770
Person / Time
Site:	Saxton File:GPU Nuclear icon.png
Issue date:	03/31/1998
From:	Kuehn G GENERAL PUBLIC UTILITIES CORP.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
1920-98-20181, NUDOCS 9804100185
Download: ML20217P770 (2)

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GPU Nuclear. Inc.

(. Route 441 South NUCLEAR Post offic* Bo"'80 Middletown, PA 17057-0480 Tel 717-944 7621 March 31,1998 1920-98-20181 U. S. Nuclear Regulatory Commission Attn: Document Control Desk

. Washington, D.C. 20555 Gentlemen:

Subject:

Saxton Nuclear Experimental Corporation Facility Operating License No. DPR 4 Docket No. 50-146 4 Consideration of a Dose to the Public from Tritiated Water Movement The purpose of this letter is to docket the results of calculations performed to evaluate the dose to the public to be expected from a hypothetical spill of tritiated water being stored in the SNEC facility Containment Vessel (CV).

The water resulted from condensation inside the CV which became contaminated and collected in the sump. The sump is periodically pumped and the resultant water is being stored in containers in de CV until plans for its removal and processing are completed. Current plans

. include activities to pump the water from the CV to a " liner" for shipment by truck to a processor.

The hypothetical event analyzed assumes that during transfer operations, the liner containing 1000 gallons of tritiated water spills the entire volume outside the CV. The water's tritium l concentration is assumed to be IE-3uCi/ml: a value which exceeds the highest concentration of tritiated water available on site. Two scenarios were considered. The first proposes a direct spill of the 1000 gallons into the Juniata River while the second proposes a spill of the same volume to the ground. The resultant dose from each scenario was calculated as described below.

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o.- s 1920-98-20181 Page 2 of 2 River Scenario The Near Field Dilution Factor was obtained using NUREG-0133 methodology. A conservative instantaneous low river flow value was obtained from 1912-1994 Juniata River data and dose calculations were performed per REG GUIDE 1.109.

The resultant 50 year committed dose would be 8 5f E-6 mreru.

Groundwater Scenario RESRAD, Version 5.61 was used to calculate pathway doses from a spill directly to the ground.

The water was assumed to cover 100 square meters and the main contributors to dose were consumption of water and vegetation by the residents.

The resultar. 1000 year committed dose would be 6.83E-01 mrem.

Formal, reviewed calculations, supporting both scenarios, are being entered into the Radiological Engineering Data Base and will be available for USNRC review if requested.

These scenarios were analyzed and found to have no signincant adverse public health and safety or environmental impact Sincerely, Q$ Mat.

G. A. Kuehn Vice President SNEC WGH cc: NRC Project Manager, NRR- Alexander Adams NRC Project Scientist, NRR - Thomas F. Dragoun