Models are described for use in site-specific environmental consequence analysis of nuclear reactor accidents of Classes 3 through 9. The models presented relate radioactivity released to resulting doses, health effects, and costs of remedial actions. Specific models are presented for the major exposure pathways of airborne releases, waterborne releases and direct irradiation from activity within the facility buildings, such as the containment. Time-dependent atmospheric dispersion parameters, crop production parameters and other variable parameters are used in the models.

Potential environmental consequences in terms of radiation dose to people are presented for postulated plutonium releases accidently caused by severe natural phenomena at the Babcock and Wilcox plant, Leechburg, Pennsylvania. The severe natural phenomena considered are earthquakes, tornadoes, high straight-line winds, and floods. Maximum plutonium deposition values are given for significant locations around the site. All important potential exposure pathways are examined. The most likely 50-year committed dose equivalents are given in Table 1 for the maximum-exposed individual and the population within a 50-mile radius of the plant. The maximum plutonium deposition values most likely to occur at the site boundary are also given in Table 1. The most likely calculated 50-year collective committed dose equivalents are all much lower than the collective dose equivalent expected from 50 years of exposure to natural background radiation and medical x-rays. The most likely maximum residual plutonium contumination estimated to be deposited at the site boundary following Earthquake No.3, the 110-mph and l30-mph winds, and the 130 mph tornado are above the Environmental Protection Agency's (EPA) proposed guideline for plutonium in the general environment of 0.2 ~Ci/m2. At distances of 600 meters from the plant, where the closest farm is located, the most likely contamination levels are estimated to be closer to the EPA's proposed guideline. For the second earthquake event and the 85-and 95-mph winds, the deposition values are below the EPA proposed guideline. iii '. • sur' lMARY 8 Estimated Quantity of Plutonium Released to the Atmosphere Following a Severe High Wind 9 Fifty-Year Committed Dose Equivalents from Inhalation Following 85-mph and 95-mph Straight~Line Winds 10 Fifty-Year Committed Dose Equivalents from Inhalation Following 110-mph and l30-mph Straight-Line Winds. 11 Estimated Maximum Plutonium Deposition at Significant Locations Following 8S-mph and 95-mph Straight-Line Winds 12 Estimated Maximum Plutonium Deposition at Significant Locations Following 110-mph and 130-mph Straight-Line Winds. 17 13 Estimated Quantity of Plutonium Released to the Atmosphere Following a l30-mph Tornado 18 14 Fifty-Year Committed Dose Equivalents from Inhalation Following a 130-mph Tornado 18 15 Estimated Maximum Plutonium Deposition at Significant Locations Following a Tornado. A.l Fifty-Year Committed Dose Equivalents from Inhalation of 1 ~m 19 AMAD 239pu Particles A-3 vi • A.2 Fifty-Year Committed Dose Equivalents from 50 Years• Inhalation of 1 ~m AMAD Resuspended 239pu Particles A-6 A.3 Air Submersion Doses from Exposure to 239pu A-7 A.4 Fifty Years of External Exposure to 239pu Deposited on the Ground A-8 A.5 Average 239pu Concentration Estimated in Leafy Vegetables and Produce for a Five-Year Period A-10 A.6 Fifty-Year Committed Dose Equivalents from 50 Years• Ingestion of Leafy Vegetables and Produce Contaminated with 239pu A-10 A.7 Average 239pu Concentration Estimated in Grain and Forage for a Five-Year Period A-12 A.8 Fif...

PNL-2984 UC-20e 1 .0 x 10-2 1.6 X 10-2 3.9 X 10-1 6.1 X 10-1 1 .1 x 10 2 1 .8 x 10 2 (a)A translocation Class Y has been assumed. (b) Insignificant. (c)Outside probability range considered in this study. iv Maximum PlutoRium Deposition Offsite (llCi 1m2) <9.4 X 10-6 8.8 X 10 1 (b) 3.6 X 10-5 3.3 X 10-2 3.4 X 10-1

Three scenarios representing significant levels of containment loss due to moderate, substantial, and major damage to the 102 Building at the Vallecitos Nuclear Center are postulated, and the potential radiation doses to the general population as a result of the airborne releases of radionuclides (hereafter called source terms) are estimated. The damage scenarios are not correlated to any specific level of seismic activity. The three scenarios are: 1. Moderate damage scenario-perforation of the enclosures in and the structure comprising the Plutonium Analytical Laboratory.

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