ML19254A788

Forwards Suppl 6 to CP & OL Application

ML19254A788
Person / Time
Site:	Vogtle
Issue date:	08/21/1979
From:	Whitmer C GEORGIA POWER CO.
To:	Boyd R Office of Nuclear Reactor Regulation
Shared Package
ML19254A790	List: ML19254A788 ML19254A791
References
NUDOCS 7908240442
Download: ML19254A788 (2)

Text

Georgia Power Company 230 Peachtree Street Post Office Box 4545 Atlanta, Georgia 30303 Telephone 404 522-6000 m

Chas. F. WP.:tmer Vi" P~ ' dent August 21, 1979 Director of Nuclear Reactor Regulation ATTN: Roger S. Boyd, Director Division of Project ..anagement U. S. Nuclear Regulatory Commission Washington, D. C. 20555 NRC DOCKET NUMBERS 50-424 and 50-425 CONSTRUCTION PERMIT NUMBERS CPPR-108 and CPPR-109 ALVIN W. V0GTLE NUCLEAR PLANT-UNITS 1 and 2 ENCLOSURE BUILDING

Dear Mr. Boyd:

Georgia Power Company hereby files three (3) signed and sixty (60) conformed copies of Supplement 6 to its application for a Construction Permit and Operating License for the Alvin W. Vogtle Nuclear Plant. This supplement consists primarily of revised analysis of the radiological consequences of a postulated loss-of-coolant accident (Reg. Guide 1.4 assumptions) using assumptions that do not assume credit for an enclosure building, and the deletion of the portion of the enclosure building above the 270 foot level (50 ft. above grade).

During the initial design stages of the Vogtle Nuclear Plant, Georgie Power Company decided to add an enclosure building around the containment in light of the uncertainties existing at that time. These uncertainties include: insufficient on-site meteorological data which forms the basis for accident dose calculations; the NRC-approved models and guidelines to be used in calculations of off-site doses; availability of approved models for calculation cf containment spray ef fectivet.e 's in removing iodine; and lack of confidence in meeting low containmen leak *:tes during demonstration tests. This design was also heavily influenced by the fact that the deletion of the enclosure building later would have essentially no impact whereas the addition of this building would signifi<intly impact all aspects of design, con-struction, and schedules. Hence, the c.pplication for a Construction Permit for the facility reflected this decision.

Since that time these uncertainties have been resolved, and consequently, Georgia Power Company has decided to delete the enclosure building from the Vogtle Nuclear Plant.

The results indicate that adequate dose margins to 10CFR100 guidelines are maintained and that the Construction Permit dose bases are met without utilizing the enclosure building. Therefore, we are proceeding with this modification of the plant design.

828 001 390 82 [

Georgia Power 1 Director of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission August 21, 1979 Page 2 If you have any concerns regarding this change, please contact us as soon as possible.

Yours very truly, T * --, n

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C. F. Whitmer

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xc: J. A. Bailey D. E. Dutton R. A. Thomas

.'. L. Vota B. L. Lex L. T. Gucwa G. F. Trowbridge, Esq.

828 002

BEFORE THE UNITED STATES NUCLEAR REGULATORY COMMISSION NRC Docket Nos. 50-424, 50-425 In the riatter of GEORCIA POWER COMPANY SUPPLEMENT 6 TO APPLICATION FOR LICENSE UNDER THE ATOMIC ENERGY ACT OF 1954 AS AMENDED FOR ALVIN W. V0GTLE NUCLEAR PLANT UNITS 1, 2 The Applicant, Georgia Power Company, hereby supplements its Application for a Construction Permit and Operating License, originally submitted on August 1, 1972, by the addition of supplementary material attached hereto.

A-

/

By:

G F. Whitmer e /

f .

Vice President Sworn to and subscribed before me, this 4 day of August, 1979.

(, -

I C( 3 /b i

'Ndtg Publf c M1 ran n  ?' State at Large

~. s% 2um 828 003

Georgia Power Compary 230 Peachtree Street Post Office Box 4545 Atlanta, Georgia 30303 Telephone 404 522-6060 m

Chas. F. Whitmer Vice President tre soortem &ctrc system

"*"U August 21, 1979 Director of Nuclear Reactor Regulation ATTN: Roger S. Boyd, Director Division of Project Management U. S. Nuclear Regulatory Commission Washington, D. C. 20555 NRC DOCKET NUMBERS 50-424 AND 50-425 CONSTRUCTION PERMIT NUMBERS CPPR-108 AND CPPR-109 ALVIN W. V0GTLE NUCLEAR PLANT-UNITS 1 AND 2 ENCLOSURE BUILDING

Dear Mr. Boyd:

Georgia Power Company hereby files three (3) signed and sixty (60) conformed copies of Supplement 6 to its application for a Construction Permit and Operating License for the Alvin W. Vogtle Nuclear Plant. This supplement consists primarily of revised analysis of the radiological consequences of a postulated loss-of-coolant accident (Reg. Guide 1.4 assumptions) using assumptions that do not assume credit for an enclosare building, and the deletion of the portion of the enclosure building above the 270 foot level (50 ft. above grade).

During the initial design stages of the Vogtle Nuclear Plant, Georgia Power Company decided to add an enclosure building around the containment in light of the uncertainties existing at that time. These uncertainties include: insufficient on-site meteorological data which forms the basis for accident dose calculations; the NRC-approved models and guidelines to be used in calculations of off-site doses; availability of approved models for calculation of containment spray effectiveness in removing iodine; and lack of confidence in meeting low containment leak rates during demonstration tests. This design was also heavily influenced by the fact that the deletion of the enclosure building later would have essentially no impact whereas the addition of this building would significantly impact all aspects of design, con-struction, and schedules. Hence, the application for a Construction Permit for the facility reflected this decision.

Since that time these uncertainties have been resolved, and consequently, Georgia Power Company has decided to delete the enclosure building from the Vogtle Nuclear Plant.

The results indicate that adequate dose margins to 10CFR100 guidelines are maintained and that the Construction Permit Jose bases are met without utilizing the enclosure building. Therefore, we are proceeding with this modification of the plant design.

828 004

Georgia Power d Director of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission August 21, 1979 Page 2 If you have any concerns regarding this change, please contact us as soon as possible.

lours very truly,

/

,C. F. Whitmer

. xc: J. A. Bailey D. E. Dutton R. A. Thomas J. L. Vota B. L. Lex L. T. Gucwa G. F. Trowbridge, Esq.

828 005