ML20147H354

Responds to 781027 NRC Ltr by Forwarding Oec Commitment to Conform W/Nrc Cold Shutdown Design Requirements for Subj Facils. W/Encl Affidavit

ML20147H354
Person / Time
Site:	05000580, 05000581
Issue date:	12/15/1978
From:	Mcwhorter R OHIO EDISON CO.
To:	Vassallo D Office of Nuclear Reactor Regulation
References
NUDOCS 7812270204
Download: ML20147H354 (3)

Text

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OHIO EDISON-COMPANY

@ 76 SOUTH MAIN STREET. AKRON, OHIO 44308 216-3844918 ROBERT J. McWHORTER vics misiosnr December 15, 1978 Mr. D. B. Vassallo Assistant Director for Light Water Reactor Division of Project Management U. B. Regulatory Commission Washington, D. C. 20555

Subject:

' Ohio Edison Company, et al Erie Nuclear Plant, Units 1 & 2 Docket Nos. STN50-580 & STN50-581 Cold Shutdown Design Requirements

Dear Mr. Vassallo:

This letter is in response to the October 27, 1978 letter from D. B. Vassallo (NRC) to Mr. R. J. McWhorter, V.P. (OEC) regarding the NRC cold shutdown design requirements imposed upon the Erie Nuclear Plant. As requested, this letter contains a singular, specific commitment by the Applicants addressing the NRC cold shutdown design requirements detailed in the above letter.

Additional seismic Category I, safety-grade steam generator dump valves (one additional' valve per steam generator) will be incor-porated into the design of the Eric Nuclear Plant. These additional valves are being provided to ensure the capability of cooling down the Erie Nuclear Plant assuming the most limiting single failure, with only offsite or onsite power available and a safe shutdown earth-quake. Operation of these valves will be by local manual valve operators.

A test of the' local control for these modulating atmospheric dump valves will be conducted prior to plant operation to demonstrate that the plant can be cooled in a controlled manner and that the valves can be operated safely and effectively.

The addition of these modulating atmospheric dump valves to the Erie Nuclear Plant is intended to provide the capebility, assuming the most limiting single failure with only onsite or offsite power available and a safe shutdown earthquake, to cool down to the decay heat removal system cut-in condition in approximately 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />.

The Erie Nuclear Plant will be analyzed to confirm the capability to depressurize, borate, and cool.down to the decay heat removal system cut-in temperature within approximately 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br /> using only safety grade equipment and with only onsite or offsite power available. This analysis will also confirm that sufficient boration

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r Mr. D. B. Vassallo - Decembe.r 15, 1978 capability exists to maintain the reactor coolant system ut a one per-cent Ak/k suberitical margin. When considering boration requirements, the highest' worth control rod -is assumed to be at the ftuly withdrawn position.

The Erie Nuclear plant will reference a planned first-of-a-

. kind prototype steady.stete natural circulation qualif:. cation test to provide assurance of adequate boron mixing and natural circulation.

Specific procedures for cooling down using natural circula-tion will be provided at the operating license review stage.

A seismic Category I auxiliary feedwater aupply is provided which will permit cool down to the DHR cut-in temterature assuming the most limiting single failure.

With these additional commitments'concerning the cold shutdown issue, it is our understanding that Ohio Edison Company has satisfied all outstanding issues and that the SER Supplement can now be issued without further delay. Should the NRC modify its position with regard to cold shutdown, Ohio Edison Company reserves:the right to modify these commitments accordingly.

Very truly yours,

,fcWZ hT4 C(tb&

RJM/RON:cyc ,

i cc: IMHayes (USNRC OIE:III) '

.RThoma(OakRidgeNationalIab)

HKohn(OPSC)

JAckerman (Ohio Dept. of Health)

IUanteier (Erie County Commissioner)

RINustard (USEPA, Chicago)

Librarian /ThermalReactorsGroup (Brookhaven National Iab)

Atomic Industrial Forum GCharnoff(SPPI)

EStebbins RTufts

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A, [ [ l D,A,y, 1 1 STATE OF OHIO )

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SUMMIT COUNTY )

On December 15, 1978, before me, a Notary Public in and for the State and County aforesaid, personally appeared Robert J. McWhorter, who after being sworn according to law, deposed and said that he is Vice-President and an Officer of Ohio Edison Company, an Ohio corporation, that in such capacities he is authorized to make this Affidavit; and that the foregoing is true s.nd correct to the best of his knowledge, information, and belief.

{ck-fs2 d , hk (ll/dd3 Robert J.' McWhorter Sworn to and subscribed before me the day and year aforesaid.

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g 9 Notary Public JOSEPHINE M. McELROY NOTARY PUBLIC - STATE OF OHIO RESIDENT OF SUMMIT COUNTY My Commission Expires Aug.17,1982 l --