ML20063K317

Forwards Revision 3 to Emergency Dose Calculational (Edc) Manual, Per NUREG-0737,Item III.A.2,License Condition 2.C.(7) & Util 820209 Commitment.No Further Automated Model Development Necessary to Satisfy Class B Edc Criteria

ML20063K317
Person / Time
Site:	Farley
Issue date:	08/31/1982
From:	Clayton F ALABAMA POWER CO.
To:	Varga S Office of Nuclear Reactor Regulation
Shared Package
ML20063K319	List: ML20063K317 ML20063K320
References
RTR-NUREG-0737, RTR-NUREG-737 NUDOCS 8209030342
Download: ML20063K317 (3)

Text

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Mailing Addr:ss Alabama Power Company 600 North 18th Street Post Office Don 2641 Birmingham, Alabama 35291 Telephone 205 783-6081 F. L Clayton, Jr.

S='ylC;'7"' Alabama Power llc SOU!hern el CfC Sy5ftwn t

August 31, 1982 Docket Nos. 50-348 50-364 Director, Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. C. 20555 Attent ion : Mr. S. A. Varga Joseph M. Farley Nuclear Plant - Units 1 and 2 NUREG-0737, Item III. A.2 Unit 2 License Condition 2.C.(7)

Gentlemen:

In letter dated Feburary 9,1982, Alabama Power Company submitted a copy of the proposed Class A Emergency Dose Calculation Model (EDCM) and committed to provide a description of the Class B EDCM by September 1, 1982. Alabama Power Company has subsequently performed a review of the Class B EDCM criteria compared to the capabilities of the present Class A

' EDCM in combination with present emergency planning and has concluded that further automated model development is unnecessary to satisfy the Class B EDCM criteria.

The Farley Nuclear Plant has a fully operational Class A EDCM described in detail by the enclosed Emergency Dose Calculational Manual, FNP-0-M-007, Revision 3. This Class A EDCM consists of four modules to provide meteorological and radiological monitoring including actual spatial and temporal variations of plume distribution and relative concentration of radioactivity within the plume exposure for a fifty (50) mile radius. The four modules are summarized below.

Data Acquisition The primary function of the Data Acquisition Module is to poll instruments which nonitor meteorological activity, radiation levels, and plant status once every minute. The module will validate the readings, test for emergency levels, and schedule subsequent processes. Data Acquisition is scheduled every fifteen minutes when an average isotopic analysis is performed.

8209030342 820831 PDR ADOCK 05000348 F PDR

e Mr. S. A. Varga August 31, 1982 Director, Nuclear Reactor Regulation Page 2 EDCM monitoring is performed by continuous recording of the status and data values of preselected critical monitors of the plant's effluent points. The determination of iodine and noble gas concentrations is performed by statistically averaging concentrations which are supplied by a microprocessor detection instrument.

, Isotopic Data Calculation The Isotipic Data Calculation Module determines the isotopic concentration of gaseous effluents at emission points for the EDCM.

Grab sample analysis results for each major emission point in the plant are stored and updated in files. Using this information and the monitor efficiency factors, the isotopic concentrations are determined. As data is acquired, a scaling factor is calculated for each isotopic group utilizing efficiency factors and current monitor readings. This scaling factor is applied to the relative concentrations at each release point to determine the isotopic concentrations released.

Plume Processing The Plume Processing Module consists of a computer model which simulates and tracks gaseous emissions released from the Farley Nuclear Plant up to 50 miles. Based on meteorological conditions and release flows, ground and/or elevated segments of the plume can be tracked -

across the 50 mile Emergency Planning Zone (EPZ). Terrain height effects and changes in meteorological conditions are taken into account for each cycle to adjust plume dispersion coefficients. These release rates are also used to determine isotopic concentrations in the plume by associating the release rates with the curie content data generated by the Isotopic Data Calculation Module.

The module also has the capability to calculate projected arrival times and intersection points with pre-designated EPZ arc boundaries every fifteen minutes. The EPZ arc boundaries are based on current mateorological and isotopic release rates.

Er.e. gency Reporting and Graphics The Emergency Reporting and Graphics Module is capable of dose i

assessment and reporting of current, projected or simulated emergency information. The module is equipped to provide tabular and linear information on demand based on current, projected or predicted l conditions. This information is also available under simulaf.ed l conditions using current emission and meteorological conditions.

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- Mr . S.w A, VaYga ix 7 August 31, 1982 ,

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• Director [ Nuclear Reactor.. Regulatiod 'N- Page 3 5 N, a k} f h, s -7 3

Ja6ular information provided includes location of current ground and elevated plume segments, plume boundar'ies, dossge and dispersion

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l' coefficients at plume segment centroids, projected plume location, l

dosage at selected times, and projected ~ arrival and lacation for the

! leading edge of the-plume atitesignated arc houndaries given current

!- rel, case rates and meteerolocical conditions. ,

' The_ graphic portion of the n$dule provides displays to' the cathode ray tune (CST) terminals, graphic printers and: plotters of current and T "" projected plume location. Different background locations within the 50 mile EPZ such as roads, bodies of water,,and major population centers

" can be gr4phically represented. Dose ' rates within the 50 m,ile EPZ may be obtained through this system, e

The Class A EDCM Anuld be aucinented by5 quantitative evaluation of deposition and ingestion pathway hazards and qualitative monitoring of the plume distribution at distances between ten -(20) and fifty (50) miles.

~ The quantitative monit'oring would be provided by Radiation Monitoring

. Teams dispatched by the State of Alabama, Georgia and Florida as part of

, their emergency plans to: evaluate ingestion pathway hazards and to protect

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the public from. consumption of contaminated food. Meteorological data to 7 identify' wet and' dry 1 deposition f.or sampling by the Radiation Monitoring

' Teams would be determined 1using the Montgomery National Weather Service Radar and radiological over.fliqht. Data obtained by these teams could be used to validate model accuracy', evaluate aiepositions and determine the ground shine. dose component as requried.

The plume distr;ibution at distances between ten.- (10) and fifty (50) miles and intermediate and long-range transport estimates can be qualitatively judged based on Class A Model output and supplemental meteorological information (meso and synopcic scale) obtained via telephone from surrounding weather statuns or the National Weather Service.

" It is the opinion of Ala6ama Power Company that'the aforementioned capabilities of the Class A EDCM and the qualitative and quantitative enchancement providet by the data acquisition of the Radiation Monitoring

.s Teams and the National Weather Service satisfies the Class B EDCM criteria.

Consequently, no' further automated model development will be performed by

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Alabama Power Company. This. submittal satisfies the meteorological program x upgrade-of. License Ccndition 2.C.(7) and the commitment of Alabama Power Company in letter dated February 9,1982.

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i Yours very truly, f

F.

f

. Clayton Jr.

l FLCJ r/RGW:1 sh-024 Enclosure I". cc: Mr. R. A. Thomas Mr. G. F. Throwbridge

& Mr. J. P. O'Reilly

, Mr. E. A. Reeves ~

Mr. W. H. Bradford

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