ML20125D133

Confirmatory Action Ltr 85-06,re Util Response to IE Bulletin 79-02.All Deadweight Supports for Category I Sys Will Be Modified or Tested as Necessary.Completion of Actions Expected Prior to Restart

ML20125D133
Person / Time
Site:	Vermont Yankee
Issue date:	06/05/1985
From:	Ebneter S NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
To:	Murphy W VERMONT YANKEE NUCLEAR POWER CORP.
References
CAL-85-06, CAL-85-6, IEB-79-02, IEB-79-2, NUDOCS 8506120257
Download: ML20125D133 (2)

Text

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.i JUN 0 5199;

. Docket No. 50-271 Vermont Yankee Nuclear Power Corporation ATTN: Mr. Warren P. Murphy Vice President and Manager of Operations '

RD 5, Box 169 Ferry Road Brattleboro, Vermont 05301 Gentlemen:

Subject:

Confirmatory Action Letter 50-271/85-06 This refers to your actions taken in response to Inspection and Enforcement Bulletin (IEB) 79-02. The Bulletin, in part, requested that all pipe support base plates that use concrete expansion anchor bolts in seismic Category I systems be tested and analyzed, 1) to provide a 95 percent confidence level that less than 5 percent defective anchors are installed in any one seismic Category I system; and 2) to demonstrate the existence of adequate factors of safety in the anchor bolt allowable loads. As a result of Region I inspection 50-271/85-04, we determined that, although the concrete expansion anchors-for seismic supports on Category I piping systems were verified as described in the Bulletin, the anchors on deadweight supports for those systems were neither tested or analyzed. Accordingly, to discuss this matter, a meeting was held between Mr. A. C. Kadak, and others of your staff, and Mr. J. P. Durr, of my staff, on May 23, 1985.

Based on the information provided at the May 23, 1985 meeting, we understand you have demonstrated with reasonable confidence, by a_ sampling analysis, that the deadweight supports have an-associated design factor of safety greater than

2. Additionally, we understand that, prior to restart following the September 1985 outage, all remaining aspects of your actions in regard to IEB 79-02 will

'be completed. Specifically, we understand that, in concert with your seismic reanalysis program, you will modify or test, as necessary, all deadweight supports for Category I systems.

If our understanding of your actions planned or taken as described above is not correct please contact Mr. J. P. Durr immediately at (215) 337-5282.

Thank you for your cooperation.

Sincerely, hd / A 8506120257 850605 PDR G

ADOCK 05000271 PDR

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2 . .i Vermont Yankee Nuclear 2 Power. Corporation cc:

Mr.-R. W. Capstick, Licensing Engineer Mr..W.' F. Conway, President and Chief Executive Officer Mr. J. P. Pelletier, Plant Manager Mr. . Donald Hunter, Vice President Mr. Cort Richardson, Vermont Public

' Interest Research Group, Inc.

Public' Document Room (PDR)

Local Public Document Room (LPDR)

Nuclear Safety Information Center (NSIC)

NRC Resident Inspector State of New Hampshire State of Vermont bcc:

Region I Docket Room (with concurrences)

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