ML20133H775

Requests Rescission of 851011 Application for Emergency Amend to Tech Specs,Allowing Hot Standby (Mode 3) for Addl 72 H.Application Deemed Necessary Due to Unidentified RCS Leakage Found on 851010.Leakage Rate Reduced

ML20133H775
Person / Time
Site:	Catawba
Issue date:	10/15/1985
From:	Tucker H DUKE POWER CO.
To:	Adensam E, Harold Denton Office of Nuclear Reactor Regulation
References
NUDOCS 8510180108
Download: ML20133H775 (3)

Text

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DuxE POWER GOMPANY P.O. BOX 33180 CHARLOTTE N.C. 28949 HAL B. TUCKER Tu s.ne. sours w,

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-- - October 15, 1985 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. C. 20555 .

Attention: .Ms. E. G. Adensam, Chief Licensing Branch No. 4 Re: Catawba Nuclear Station Unit 1 Docket No. 50-413

Dear Mr. Denton:

By letter dated October 11, 1985, Duke Power Company (Duke) requested a one time Emergency Amendment to the Technical Specifications for Facility Operating License NPF-35 for Catawba Unit 1. The requested change would have allowed the unit to remain in Hot Standby (Mode 3) for an additional 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> beyond the Action Statement of Technical Specification 3.4.6.2.

The requested amendment was deemed necessary because of a 1.2 gpm uniden-tified leakage from the Reactor Coolant System. Leakage calculations first identified this problem on October 10, 1985 at approximately 1415 hours0.0164 days <br />0.393 hours <br />0.00234 weeks <br />5.384075e-4 months <br />. The unit was placed in Hot Standby (Mode -3) within the time allo' ed by the Action Statement. Efforts to identify the source of the leakage were not successful after unit shutdown, and additional time was needed. By allowing the unit to remain at Hot Standby (Mode 3), the likelihood of identifying the source of the leakage was enhanced.

Efforts to identify and correct the source of'the leakage continued into the early morning of October 12, 1985. At approximately 0100 hours0.00116 days <br />0.0278 hours <br />1.653439e-4 weeks <br />3.805e-5 months <br /> on that day, leakage calculations indicated that unidentified leakage had been reduced to approximately 0.55 gpm. By reducing the leakage rate to within limits prior to 0615 hours0.00712 days <br />0.171 hours <br />0.00102 weeks <br />2.340075e-4 months <br /> on October 12, 1985, the Action Statement had been complied with, without reliance on the additional 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> as '

had been requested.

We therefore wish to rescind our emergency request, dated October 11, 1985, to amend Technical Specification 3.4.6.2. As a result of this occurance, a more general amendment to the Technical Specification may be proposed at some future date.

Very truly yours, Mh.

Hal B. Tucker ROS: sib 9,

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Mr. Harold R. Denton, Dirsctor October 15, 1985 Page Two cc: Dr. J. Nelson Grace Regional Administrator U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 ,

Robert Guild, Esq.

.P. O. Box 12097 Charleston, South Carolina 29412 American Nuclear Insurers c/o Dottie Sherman, ANI Library

-The Exchange, Suite 245 270 Farmington Avenue Farmington, CT 06032 Palmetto Alliance 2135 Devine Street Columbia, South Carolina 29205 NRC Resident Inspector Catawba Nuclear Station t

. , . . . . , . , - .-., ._. .. .~, _ . _ , _ .. _ _. _ . . _ . _ . - _ ~ . . . . . _ . . . . , . .

r Mr. Harold R. Denton, Director Octobar. 15, 1985

-Page Three HAL B. TUCKER, being duly sworn, states that he is Vice President of Duke Power Company; that he is authorized on the part of said Company to sign and file with the Nuclear Regulatory Commission this rescinsion, and that all statements and matters set forth therein are true and correct to the best of his knowledge.

5 d -

Hal B. Tucker, Vice President Subscribed and sworn to before me this 15th day of October, 1985.

1 Hotary Public b

My Commission Expires:

Septembrir 20, 1989