ML20207B138

Disagrees That Proposed Amends to Licenses NPF-9 & NPF-17, Eliminating Need to Plug Steam Generator Tubes,Would Not Involve Significant Hazards Consideration.Notice of Opportunity for Prior Hearing Re Amends Encl

ML20207B138
Person / Time
Site:	Mcguire, McGuire
Issue date:	07/11/1986
From:	Youngblood B Office of Nuclear Reactor Regulation
To:	Tucker H DUKE POWER CO.
Shared Package
ML20207B144	List: ML20207B138 ML20207B153
References
TAC-61775, TAC-61776, NUDOCS 8607170439
Download: ML20207B138 (4)

Text

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I Docket Nos.: 50-369 and 50-370 11 JUL 13SS Mr. H. B. Tucker, Vice President Nuclear Production Department Duke Power Company 422 South Church Street Charlotte, North Carolina 28242

Subject:

P-STAR Criterion for Steam Generator Tube Plugging - McGuire Nuclear Station, Units 1 and 2 Your letters of June 24 and July 1,1986, proposed amendments to the Tech-nical Specifications for the McGuire Nuclear Station that would eliminate the need to plug steam generator tubes with defects located at least a cer-tain distance below the top face of the tubesheet region. The proposed distance, called P-Star, is 2 inches.

In support of the proposed change, your June letter provided a Westinghouse Report, "McGuire Units 1 and 2 Tubesheet Region Plugging Criterion." The analyses within the Westinghouse Report are intended to demonstrate that in the event of a "circumferential" separation of the tube below P-Star, the travel upwards of the separated tube would be limited to a position where the extrados surface of the U-bend apex is in contact with the tube directly above it. He find that the potential safety implications associated with tube separation and movement, such as accelerated wear and leakage, have not been previously reviewed. Therefore, we are unable to agree that such a change would not cause a significant reduction in a safety margin or a significant increase in the probability of an accident previously evaluated.

Thus, we cannot conclude that the proposed amendment does not involve a significant hazards consideration. Accordingly, we are issuing the enclosed notice of opportunity for prior hearing.

Sincerely, W\

B. J. Youngblood, Director PWR Project Directorate #4 Division of PWR Licensing-A

Enclosure:

As stated cc: See next page l

DISTRIBUTION: '

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MDuncan EJordan SEE PREVIOUS CONCURRENCES PWR$/hWR-A PWR#4/DPWR-A EB/DPWR-A 0, ELD PWR#4/DPWR-A

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r E 1 JUL 13SS 7590-01 For further details with respect to this action, see the application for amendments dated June 24, 1986 and its supplement dated July 1, 1986, which are available for public inspection at the Commission's Public Document Room,1717 H Street, N.W. , Washington, D. C. And at the Atkins Library, University of North Carolina, Charlotte (UNCC Station), North Carolina , 28242.

Dated at Bethesda, Maryland this day of 1986.

FOR THE NUCLEAR REGULATORY COMMISSION Dave Wigginton, Acting Director PWR Project Directorate #4 Division of PWR Licensing-A 4

• SEE PREVIOUS CONCURRENCES

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UNITED STATES yj NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 y

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/ 11 JUL 1986

.aet Nos.

50-369 and 50-370 Mr. H. B. Tucker, Vice President Nuclear Production Department Duke Power Company 422 South Church Street Charlotte, North Carolina 28242

Subject:

P-Star Criterion for Steam Generator Tube Plugging - McGuire Nuclear Station. Units 1 and 2 tour letters of June 24 and July 1,1986, proposed amendments to the Tech-nical Specifications for the McGuire Nuclear Station that would eliminate the need to plug steam generator tubes with defects located at least a cer-tain distance below the top face of the tubesheet region. The proposed distance, called P-Star, is 2 inches.

In support of the proposed change, your June letter provided a Westinghouse Report, "McGuire Units 1 and 2 Tubesheet Region Plugging Criterion." The analyses within the Westinghouse Report are intended to demonstrate that in the event of a "circumferential" separation of the tube below P-Star, the travel upwards of the separated tube would be limited to a position where the extrados surface of the U-bend apex is in contact with the tube directly above it. We find that the potential safety implications associated with tube separation and movement, such as accelerated wear and leakage, have not been previously reviewed. Therefore, we are unable to agree that such a change would not cause a significant reduction in a safety margin or a significant increase in the probability of an accident previously evaluated.

Thus, we cannot conclude that the proposed amendment does not involve a significant hazards consideration. Accordingly, we are issuing the enclosed notice of opportunity for prior hearing.

Sincerely, b

sm=

'p B. J. You g ood, Director PWR Project Directorate #4 Division of PWR Licensing-A

Enclosure:

As stated cc: See next page I

Pr. H. B. Tucker

""'m Nwer Company McGuire Nuclear Station cc:

Mr. A. Carr Dr. John M. Barry Duke Power Company Department of Environmental Health P. O. Box 33189 Mecklenburg County 422 South Church Street 1200 Blythe Boulevard Charlotte, North Carolina 28242 Charlotte, North Carolina 28203 Mr. F. J. Twogood County Manager of Mecklenburg County Power Systems Division 720 East Fourth Street Westinghouse Electric Corp. Charlotte, North Carolina 28202 P. O. Box 355 Pittsburgh, Pennsylvania 15230 Chainnan, North Carolina Utilities Comission Mr. Robert Gill Dobbs Building Duke Power Company 430 North Salisbury Street Nuclear Production Department Raleigh, North Carolina 27602 P. O. Box 33189

, Charlotte, North Carolina 28242 Mr. Dayne H. Brown, Chief Radiation Protection Branch J. Michael McGarry, III, Esq. Division of Facility Services Bishop. Libennan, Cook, Purcell Department of Human Resources and Reynolds P.O. Box 12200 1200 Seventeenth Street, N.W. Raleigh, North Carolina 27605 Washington, D. C. 20036 Senior Resident Inspector c/c U.S. Nuclear Regulatory Comission Route 4, Box 529 Hunterville, North Carolina 28078 Regional Administrator, Region II U.S. Nuclear Regulatory Comission, 101 Marietta Street, N.W., Suite 2900 Atlanta, Georgia 30323 L. L. Williams Operating Plants Projects Regional Manager Westinghouse Electric Corporation - R&D 701 P. O. Box 2728 Pittsburgh, Pennsylvania 15230

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