ML20148T452

Manager,Quality Assurance Dept Has Assumed the Duties of Previous Chief Nuc Qual Assurance Engineer & Responsibility for All non-nuc Quality Assurance.Forwards Clarification of Main Steam Valve Leak Rate Analysis

ML20148T452
Person / Time
Site:	05000580, 05000581
Issue date:	12/01/1978
From:	Mcwhorter R OHIO EDISON CO.
To:	Baer R Office of Nuclear Reactor Regulation
References
NUDOCS 7812050196
Download: ML20148T452 (3)

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ROBERT J. McWHORTER OHIO EDISON COMPANY-76 SOUTH MAIN STREET, AKRON, OHl0 44308 216 384-5918

- VICE PRE 51 DENT December 1, 1978  ;

Mr. Robert Baer Chief, Light Water Reactors Branch No. 2 Division Project Management U. S. Nuclear Regulatory Commission Washington, D. C. 20555

Subject:

Ohio Edison Company, et al 4 Erie Nuclear Plant, Units 1 & 2 Docket Nos. STN50-580 & STN50-581 Company Reorganization and Leak Rate Analysis

Dear Mr. Baer:

1 In a recent telephone conversation between Mr. D. Tibbitts I of the NRC and Mr. R. Walter of OEC, a question arose regarding the

.cesponsibilities of the Manager, Quality Assurance Department. The following is an explanation of those responsibilities. The Manager, Quality Assurance Department has assumed all the duties of the previous Chief Nuclear Quality Assurance Engineer. In addition, the Manager, Quality Assurance Department has responsibility for all non-nuclear quality assurance. These changes regarding the Ohio Edison Company reorganization will be incorporated into a future amendment to the PSAR.

In another telephone conversation.between the same parties, the NRC informed Ohio Edison that further clarification of the leak rate analysis for the main steam isolation valve is required in order for them to complete their review. The following information is being submitted to provide that clarification:

1. The homogenous model from RELAP1 1 was used to size the 1 GPM hole at 1 582 x(10-5) 2ft . Sonic flow ,

was. assumed. I

2. The post accident flow was calculated using the following equation from Dynamics and Thermodynamics of Compressible Fluid Flow, A. H. Shapiro,1933:

\ 0 7812050t% i p u

. - . -. -. . . . . - . . .. . . . . . . ~ .

-Mr. Robert Baer December 1, 1978 ,

K+1 W K / 2 TK-1 P.  ;

II ., R \K+1/. g 7

'W== P A .411 W.

I The equation assumes ronic flow.

3. T u percent leak rate per day was obtained by making a plot of the post LOCA leak rates from a CONTEMPI run.- This plot leveled out at just below a peak of .14%/ day, which the plot appeared ,

to approach asymptotically.

If you have any questions or comments on the above, please -

advise.

Very truly yours, M .\ d u BMM/ ROW:cyc ,

cc: DWHayes (USNRC OIE:III) [

RThoma(OakRidgeNationalLab)

HKohn (OPSC)

JAckerman (Ohio Dept. of Health)

PGasteier (Erie County Commissioner)

RLMustard (USEPA, Chicago)

Librarian /ThermalReactorsGroup (Brookhaven National Lab)

Atomic Industrial Forum GCharnoff-(SPPT)

EStebbins RTufts i

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^ E E I P. A 11 T,,,,

STATE OF OHIO SS.

SUMMIT COUNTY )

On December 1, 1978, before me, a Notary Public in and for the State and County aforesaid, personally appeared Barry M. Miller, who after being duly sworn according to law, deposed and said that he i-Manager, Erie Nuclear Plant Project of Ohio Edison Company, an Ohic Corporation, that in such capacities he is authorized to sign official correspondence on behalf of Robert J. McWhorter, Vice President, in relation to licensing for the Erie Nuclear Plant and therefore authorized to make this Affidavit; and that the foregoing is true and correct to the best of his knowledge, information, and belief.

m .

N Barry M. Miller Sworn to and subscribed before me the day and year aforesaid.

( -

P y (/ Notary Public [/

JOSLfli!TM f.1.IkELR0i fJ3IARY PUL'lE - STATE OF OH!c RESIDENT OF SiRIT C00fHY My Commicson Expires Aug.17,1982