ML18136A036

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Responds to 790427 & 0521 Ltrs Reporting Results of Seismic Reanalysis of Reactor Coolant Piping Per IE Bulletin 79-07. Matter Resolved.Safety Evaluation Encl
ML18136A036
Person / Time
Site: Nine Mile Point, Surry, Robinson  Constellation icon.png
Issue date: 05/22/1979
From: Schwencer A
Office of Nuclear Reactor Regulation
To: Jackie Jones
CAROLINA POWER & LIGHT CO.
Shared Package
ML18136A035 List:
References
NUDOCS 7910100055
Download: ML18136A036 (2)


Text

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UNITED STATES NUCLEAR REGULATORY COMMISSION.

    • ..WASHING.TON, D. C. 20555.

Docket Nos. 50-280 and so:...2a1 Mr~ James Whittine State Corpor~tion Commission Commonwealth of Virginia P.O. *Box 1197 Richmond, Virginia 23209

Dear Mr. Whittine:

      • September 18, *1979 At the meeting with us on September 5, 1979, to discuss the Surry Power Station, you requested that we provide you with examples of licensees*

justifications for continued plant operations even though it was dis-covered that the plant design had been based on pipe stress analyses which had used unacceptable algebraic summation techniques.

He have evaluated all plants which used algebraic summation and we have enclosed some samples of our evaluations.

Enclosed are the NRC evaluations for the following plants.

H. B. Robinson, No. 2 Zion, Nos. l and 2 Nine Mile Point D. C. Cook Brunswick May 22, 1979 July 5, 1979 June 19, 1979 June 22,

  • 1979.
  • June 7, l 979..

Some of these pl ants, such as Robinson, may have been shutdown at the time of issuance of IE Bulleti~ 79-07.

You will note that in each of these cases, the licensee was able, through reanalysis*, to demonstrate that stresses are within allowable limits.

I trust these evaluations are responsive to your request.

Sincerely, 1 a ;u, l(' l t/f,,,_

C A. Schwencer. Chief Operating Reactors Branch #1

.Division of Operating Reactors

Enclosures:

(5)

NRC Safety Evaluations for plants listed above cc:

w/enclosures See. next page*

~ '.

Mr.*w. L. Pfoffitt Virginia Electric and PowerCompany cc~

Mr. Michael W. Maupin Hunton and Williams Post Office Box 1535

  • Richmond, Virginia 23213 Swem Library College of William and Mary Williamsburg, Virginia 23185 cionaldJ. Burke
u. S. Nuclear Regulatory Cammi ssion Region II Office of Inspection and Enforcement 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303
  • ~eptember 18, 1979