ML20003C569

Requests NRC Assistance in Developing Class a Dose Projection Model for Use in Ordering Offsite Protective Actions,Per FEMA Recommendation.Written Statement of Modifying Factors Requested Re App 2 of NUREG-0654

ML20003C569
Person / Time
Site:	Farley
Issue date:	02/18/1981
From:	Mcnees J ALABAMA, STATE OF
To:	Zalcman B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
References
RTR-NUREG-0654, RTR-NUREG-654 NUDOCS 8103060475
Download: ML20003C569 (2)

Text

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4 State of Alabama er W. 4

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• IRA L. MYERS. M.D. February 18, 1981 mN STATE HEALTH OFFICER -

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i 1A Mr. Barry Zalcman *C i

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Emergency Planning Analyst /

Emergency Preparedness Division ,,

U.S. Nuclear Regulatory Commission , . ,, / dg W 7920 Norfolk Avenue Mail Stop 242 Bethesda, Maryland 20014

Dear Mr. Zalcman:

During the November,1980, FEMA acceptance exercise at the Joseph M.

Farley Nuclear Power Plant, the State of Alabama and the utility arrived at dif ferent of f-site dosage projections. These were sufficient to cause the protective actions ordered by the State to be dif ferent from the recommendation of the utility. Subsequent to the drill, I have been informed that NRC is requiring Farley to adopt a dose projection modei that includes the " Class A" characteristics. Further, FEMA Region IV, in their written evaluation, recommended that the State adopt the same model as the utility. On verbal questioning, I was informed that this meant the State should also adopt a Class A type model. The reasoning for this was that the State's model will be used for ordering of f-site protective actions.

We request the assistance of NRC in developing a " Class A" type model for use in ordering protective actions off-site. This model should be compatible with those which both Alabama Power Company and TVA use on-site. Our basic problem is that Appendix 2 of NUREG 0654 is not specific on the exact modifying f actors to be included and how each is to be modeled.

If possible, please supply us written statements of the modifying factors we need. However, if this is impracticable, we request an appointment in the near future to meet with NRC staff for the purpose of obtaining specific NR" assistance in improving upon of f-site dispersion model as recommended by FEMA Region IV.

The current system used for ordering of f-site protective actions in Alabama is that of EPA-520/1-75-001 modified by a building wake factor of 1/2 A and a finite cloud correction factor. We are considering modifying these so as to include the vertical stability class from the vertical temperature diffferential and the horizontal stability class from standard deviation of the horizontal wind direction variations.

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50 Mr. Barry Zaleman

1. Page 2 February 18, 1981 l What additional factors are needed to make the off-site model used for i 3

ordering protective actions more accurate and consistent with the one NRC l is requiring of the utility?

Your prompt reply will be appreciated.

l Sincerely,

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James L. McNees Radiation Physicist Division of Radiological Health Enviromnental Health Adnitiistration JIM:jm cc: Mr. Jack Richardson '

RAC Chairman j FEMA Region IV ,

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