ML20212L180

Forwards Request for Addl Info Re 860909 Proposed Mods to Tech Specs for Min River Level.Response Requested within 30 Days

ML20212L180
Person / Time
Site:	Hatch
Issue date:	03/06/1987
From:	Rivenbark G Office of Nuclear Reactor Regulation
To:	James O'Reilly GEORGIA POWER CO.
References
TAC-62127, TAC-62128, NUDOCS 8703100287
Download: ML20212L180 (4)

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SUBJECT:

REQUESTF0kADDITIONALJINF01)tATIONONMODIFICATION.0FTECHNICAL SPECIFICATIONS FOR MINIMUM MIVsR IEVEli _ ,

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}I.. Re: /+ 'Edwin'I.'Ha'tchNuclearPlant!Unitb11.andi?

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x.z j ,. ,1 o 1986, Georgia Power, Company proposed modifications to '

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the Technical Specificat 9[ians;to HatchiUnitC1 We'inveireviewed letter of September and 2. these .

W proposed modifications. In order to complete this review .we need the .

' additional-information described in the enclosure. .You are squested.to' .. >

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provide a written response submitting the requested:information within~ 30 days. *

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9 of receipt ofjthis letter.

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[.( ' Thetherefore, reportinfrecuirements OKil clearance.isof notthis-letter reqt ired under affect feJda P.L. #d-5U. th'an ~ ten respondents;

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Edwity I. Hatch Nuclear Plant, Georgia Power Company Units Nos. 1 and 2 cc:,

l s s s Bruce W. Chruchill, Esquire

. Shaw, Pittman, Potts .& Trowbridge 2300 N Street, N.W.

Wathington, D.C. 20037 Mr. . L. T. -Gucwa Engi,neering Department GeoFgia Power Company-Post Office Box 4545 Atlanta, Georgia 30302 Mr. H.j C. Nix,- Jr. , General Manager i Edwin[1..HatchNuclearPlant Georgu Power Company Po W 0ffice Box 442 ', ,

Baxley, Georgia 31513 .

Mr. Louis B. Long Southern Company Services,- Inc. c Post Office-Box 2625 Birmingham, Mabama 35202 m

Resident Inspector U.S. Nuclear Regulatory Comission P.oute J., Post Office Box 279 Baxley',' Georgia 31513 Regional Adrpinistrator, Region II U.S. Nuclear Regulatory Comission, '

101 Marietta Street, Suite 2900 Atlants, Georgia 30303 .

Mr. Charles H. Badger Office of Planning and Budget Room 610 270 Washington Street, S.W. ',.'

Atlanta, Georgia 30334 -

s Mr. J. Leonard Ledbetter, Comissioner Department of Natural Resources 270 Washington Street, N.W.

Atlanta, Georgia 30334 Chairman Appling County Commissioners County Courthause Baxley, Georgia 31513 I

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kEQUEST FCR ADDITIONAL INFORf'ATION EY THE 0FFICE OF NUCLEAF. REACTOR REGULATION

.PF0 POSED TECHNICAL' SPECIFICATION MODIFICATI0h5 yr- REGARDING l'JhlMUM RIVER LEVEL d

'liAlCH UNITS -1 AFD 2 DOCKET NOS. 50-321 A 366

.l. Provide a map shewing the locatiun of the weir relative to the plart intake and the downstream gage. Ir, addition, prende a profile of the river bottom.

2. Provide a drawing of a typical cross section of' the weir showing ' height, top width, and side slopes. Also provide a description-of the bottom material __ of. the ~ river upon which the weir ~ is founded.

3. Based.cn the design and location of the weir, discuss the consecuence of V

failure of the structure with regard to water level at the intake. - Also discuss the possibility of diversion of the river away from the intake due to the erosion at the weir f rom overtopping and subsequent foundation failure.

4 Provide a copy of the-Corps of Engineers permit, if any, for cor.struction of the weir and explain the " temporary" nature of the weir (if not explaineo in the pernit).

5. Describe the' steps that will be taken to nonitor sediment buildup upstream of the weir.

6. Section 2.4.11.5 of the FSAR and the staff's SER for Hatch Unit 2 refer to the minimum cperating elevation of the RHR service water pumps of 59.0 feet'above mean seal level dat'um (ft. msl.) with regard to minimum water requirements for the plant. Your letter of September 9,1986, refers to

/ elevation 59.9 f t. ms1. with regard to minimum operating level for the Plant Service Water (PSW) pump providing the required flow for safe shutdown. Is elevation 59.9 ft. msl. the controlling water level consideration over the long term of the accident? If not, describe the most severe accident considerations considered in terms cf water requirement and necessary river levels over at least :: 30 day period.

7. The FSAR does not address events which could cause aoditional lowering of the river level such as wind induced setdown or cloggirg of the 1.itake screens by debris. Calculate the setdown at the pump well resulting from a '100 year recurrent wind, critically oriented with regard to the intake structure, or' provide a discussion which shows significant wind setdown to be highly unlikely baseo on fetch length, bathymetry, wind speeds, wind directions, etc. In acditiun, discuss the likelihood of debris blockage during low flow periods and the effects on pump well water level.

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' 8, -Under l'ow' flow ccoditions and the. proposed technicalispecifications :dc

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, L you intend to operate in'ej mar.ner which will always preclude cavitation-in the PSW cumps? Will purnp cavitetion-be allowed in order to carry;out ar..

orderly shutdown as opposed tc.anl emergency. shutdown in the event'of a.

rapidly lowering water level? ~:If so, what will be the effect on the purrps,- and what steps wil.1 be taken to keep'such effects to c.nir.inum?

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