ML19339C822

Forwards 800903 Assessment of Floodplain Aspects of Site Per Executive Order 11988 Re Floodplain Mgt

ML19339C822
Person / Time
Site:	McGuire, Mcguire
Issue date:	11/05/1980
From:	Youngblood B Office of Nuclear Reactor Regulation
To:	Parker W DUKE POWER CO.
References
NUDOCS 8011190592
Download: ML19339C822 (5)

Text

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O UNITED STATES go g

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NUCLEAR REGULATORY COMMISSION 3

j WASHINGTON, D. C. 20555 a

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j NOV 0 51980 m

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h E-Docket Nos.: 50-369

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pjg and 50-370 g^h 09 Mr. William 0. Parker, Jr.

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Eb Vice President - Steam Production y

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Duke Power Company 3

m P. O. Box 2178 422 South Church Street Charlotte, North Carolina 28242

SUBJECT:

FLOODPLAIN ASPECTS OF THE MCGUIRE NUCLEAR PLANT SITE We have issued an assessment of the Floodplain Aspects of The McGuire Nuclear Plant Site pursuant to Executive Order 11988, Floodplain Management.

A copy of this report is enclosed and is being placed in The Commission's Public Document Room, 1717 H Street, N. W., Washington, D. C.

20555 and at the Atkins Library, University of North Carolina, Charlotte (UNCC Station), North Carolina 28223.

Sincerely, o

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z B. J. Youngblood, Chief Licensing Branch No. 1 Division of Licensing

Enclosure:

Floodplain Assessment cc:

Service list 801119059F A

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1 Mr. William O. Parker, Jr.

Vice President, Steam Production Duke Power Company P. O. Box 2178 422 South Church Street Chailotte, North Carolina 28242 cc: Mr. W. L. Porter Richard P. Wilson, Esq.

Duke Power Company Assistant Attorney General P. O. Box 2178 State of South Carolina 422 South Church Street 2600 Bull Street Charlotte, North Carolina 28242 Columbia, South Carolina 29201 Mr. R. S. Howard Office of Intergovernmental Power System Division Relations Westinghouse Electric Corporation 116 West Jones Street P. O. Box 355 Raleigh, North Carolina 27603 Pittsburgh, Pennsylvania 15230 County Manager of Mecklenburg County Mr. E. J. Keith 720 East Fourth Street EDS Nuclear Incorporated Charlotte, North Carolina 28202 220 Montgomery Street San Francisco, California 94104 U. S. Environmentai Protection Agency Mr. J. E. Houghtaling ATTN:

EIS Coordinator NUS Corporation 345 Courtland Street, N. W.

2536 Countryside Boulevard Atlanta, Georgia 30308 Clearwater, Florida 33515 Mr. Tom Donat Mr. Jesse L. Riley, President Resident Inspector McGuire NPS The Carolina Environmental Study Group c/o USNRC 854 Henley Place Post Office Box 216 Charlotte, North Carolina 28207 Cornelius, North Carolina 28031 J. Michael McGarry, III, Esq.

Debevoise &.Liberman 1200 Seventeenth Street, N. W.

Washinton, D. C.

20036 Robert M. Lazo, Esq., Chairman Atomic Safety and Licensing Board U. S. Nuclear Regulatory Commission Washington, D. C.

20555 Dr. Emmeth A. Luebke Atomic Safety and Licensing Board U. S. Nuclear Regulatory Commission Washington, D. C.

20555 Dr. Cadet H. Hand, Jr., Di rector Bodega Marine Lab of California P. O. Box 247 Bodega Bay, California 94923 1

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September 3,1980 FLOODPLAIN ASPECTS OF THE MCGUIRE NUCLEAR PLANT SITE DOCKET NOS. 50-369, 50-370 All major plant structures and site construction were substantially complete-at the time Executive Order 11988 Floodplain Management, was signed by President Carter in May 1977. This includes intake structures, discharge facilities, and dam embankments.

It is, therEfore, our Conclusion that consideration of alternative locations for those structures identified as being in the floodplain is neither required nor practicable.

Lake Norman on the Catawba River is utilized by the plant as a source of normal

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cooling water.".. t. Construction of the Standby Nuclear Service Water Pond (SNSWP) e s

9 andtheWasteWaterCollectionBasin(WWCB)has,producedtwo[additionalwater bodi~s at the site. These are located on an intermittent stream that discharges-e to the Catawba River.

The attached figure shows the locations of the above water sources.

For Lake Norman, the one-percent chance (100-year) flood level at the site is -

approximately elevation 760 feet asl.

Major plant structures are at plant grade which is 760 feet msl.

Portions of the intake and discharge structures are, by design, located below the 100-year flood levels. The plant has been designed to withstand the flooding effects of a Probable Maximum Flood (PMF) which reaches an elevation pf 767.9 ft.ms1. Plant structures are protected from the PMF on Lake Nonnan by earth dikes, which are extensions of Cowens

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Ford Dam. No plant structures will therefore be affected by flooding on Lake Norman.

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For the SNSWP, the 100-year flood level at the site is approximately elevation 743.5 ft. msl, 3.5 feet above the normal pond level This flood level is well below plant grade and no structures siL.J wi. plant grade are affected.

~ The service water intake structure has been designed for the PMF, which reaches an elevation of 746.9 ft. msl.

The'100-year flood level for the WWCB is approximately elevation 694 ft. msl, 4 feet above normal water level, but well below plant grade.

No major plant structures are affected.

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.s Cons truction'of 'tlie.- r,"two siniT1" dams' for the"SNSWP ind WWCB'h'avi altered flood -

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~ ~ levels onl the_small streWwhich was impoun' ed.

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....:..;;d,x.~As,.previously mentioned, the dams were constructed ere ms are constructe prior to the issuance of E.0. 11988.

We also conclude that the plant structures other than the dams in the floodplain e

will have negligible effect on post-construction water levels during a flood event. This conclusion is based on the small cross sectional area of those structures in relation to the area of flow available in the reservoirs.

In this s-g case, flood levels are relatively unaffected by any small flow obstructions.

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