ML20128C674

Provides Comments on Recipient Re Proposed Provisional OL for Plant

ML20128C674
Person / Time
Site:	Monticello
Issue date:	01/13/1971
From:	Morris P US ATOMIC ENERGY COMMISSION (AEC)
To:	Davis P AFFILIATION NOT ASSIGNED
Shared Package
ML20128C677	List: ML20128C674 ML20128C682 ML20128C694
References
NUDOCS 9212040505
Download: ML20128C674 (2)

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"'4 Mrs. Paula Davia 1 Eagle Send, Minnesota 56446 d '

e l Dear Mrs. Davisi i 1

The following are the coussesge of the Atomic Emergy Cossaissioe's Regulatory staff on your letter of November 2,1970, to the Chairman of the Atomic Safety and Licensing Board which is com-ducting the public hearing in regard to the proposed provisional operating license for the Northern States Power Company Montice?12 Nuclear Generating Plant (AEC Docket No. 50-263).

Northern States Power Cowpsny has conducted a program of measure-ment of the meteorological characteristics of the Monticello site by use of meteorological instruments mounted om a 150 foot-high tower located at the Monticello site. In its Final Safety Analysis Report, Northern States Power Company summarised the results of this experimental progran which demonstratos that the site, in terms of seteorology, is typical of the North Central United States. These data were then utilized try the Atomic Energy Cotanission's Regulatory Staff in evaluating the offsite radiological ef fects from mermal operation sad from postulated accidents (Safety Evaluattom pages 6, 40 and 43-49, copy enclosed).

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As to postulated accidents or incidents, the predicted occurrence of inversions at the Monticello site was used by the regulatory staff in evaluating offsite radiological consequences from these accidents which wow 14 result in a ground level release of radio-active materials. (The Fasquill Type F condition cited on page 48 of our Safety Evalnation repneente conditions equivalent to inversion conditions). In evaluating potential offsite doses from accidents which result in the release of radioactive materials from the 328 foot-high plant stack, notably the loss-of-coolant accident, we considered an even more conservative meteorological condition than loversion (page 45 of our Safety Evaluation).

In this case, we assume an inversion condition associated with a fumigation condition. These meteorological conditions

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result in the radioactive plume released from the plant stadt ,

reaching the ground closer to the site boundary, and thus would 4,./

result in higher effette desee them for the intereses sendition.

alone. The offsite desee from these postulated seeidente are ,

well within the guideliu values specified in 10 CFR Part 100 of the Commissies's Regulations (eepy emelooed).

Aa described in our Safety Ivaluation, we and our consultant (Air Resources Environmental Laboratory, Environmental Science Service Administration), concluded that suitably conservative meteorological conditions, based on actual onsite meteorological measurements, were used in evaluating the effects on the environ-ment of normal operating and postuisted accidental airborne effluente from the Monticello plant.

Since rely ,

Enginal 1 stood by reier L uents Peter A. Morris, Director Division of Raaetor Licensing Enclosures

1. Safety Evaluation

2. 10 CFR Part 100 Distribution:

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