ML20058K640

Requests Response to Listed Questions Re Recent Discovery of Cracks in Feedwater Nozzle Bend Radii at Quad-Cities, Pilgrim & Monticello

ML20058K640
Person / Time
Site:	Monticello, Pilgrim, Quad Cities
Issue date:	04/06/1976
From:	Ziemann D Office of Nuclear Reactor Regulation
To:	Mayer L NORTHERN STATES POWER CO.
References
NUDOCS 9102130407
Download: ML20058K640 (3)

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APR 0 61976 Dceket No. 50-263 Northern States Power Company ATTN:

Mr. L. O. Mayer, Manager Nuclear Support Services 414 Nicollet Mall - 8th Floor Minneapolis, Minnesota 55401 Gentlemen:

RE: HONTICELLO NUCLEAR GENERATING PLANT The recent discovery of cracks in the feedwater nozzle blend radii at Quad Cities I arid Pilgrim 1 Uuclear Power Stations, coupled with the previous discoveries at other stations, including Monticello, has acplified the need to determine the exact cause of the problem and thus undertake the proper short-tern and long-term corrective actions. Your assistance is needed in the collection of pertinent data.

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You are therefore requested, within 30 days of receipt of this letter, to respond to the following questions:

1.

Provide date of next planned inspection Provide the number of startup/ shutdown cycles to the date of the c.

inspection already accceplished, and the number of cycles since such inspection. Provide the estimated nu=ber of cycles at the next planned inspection date.

A startup/ shutdown cycle is defined as a pcwer increase from zero and subsequent return to zero.

3 Descrite actions taken er planned to mininire ccid, internittent feedwater flew to the reactor pressure vessel. Include changes in operating precedures and any redesicr. of feedwater heeters, pu rs, flow control valves, piping, etc.

4.

Describe reactcr pressure vessel pressure-terrerature li-ite for operating conditions and especially for the inservice hycrostatic and leak tests.

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APR 0 S 1976 Northern D. ates Power Co::,rd i-2-

I Please provide one signed original and 39 copies of your response.

j This request for generic information was approved by CAO under a blanket clearance nu=ber B-380225 (E0072); this clearance expires July 31, 1977.

I Sincerely, l

M signed by

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Dennis L. Zie: ann, Chier Q

Operating Ecactors Branch #2 Division of Operating Reacters cc:

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Form AIC 518 (Rev. 9 53) AECh 0240 D u. a. nove nwesan, enewtowe orrecae sev4.mse.see

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• 3-Northern States Power Company APR 0; 39,3 cc Gerald Charnoff, Esquire Anthony Z. Roisman, Esquire Shaw, Pittman, Potts and Roisman, Kessler and Cashdan Trowbridge 1712 N Street, N. W.

Washington, D. C.

20036 1800 M Street,:..

Washington, D. C.

20036 The Environmental Conservation Arthur Renquist, Esqui re Libra ry Vice President - Law hunneapolis Public Library Nortnern States Power Company 300 Nicollet :all 414 Nicollet h11 Minneapolis, Ennesota 55401 Funneapolis,.idnnesota 55401 Howard J. Vogel, Esquire Legal Counsel

.s 2750 Dean Parkway hunneapolis, Minnesota 55416 Mr. Steve J. Gadler 2120 Carter Avenue St. Paul, Minnesota 5510S Daniel L. Ficker, Esquire Assistant City Attorney Criminal Division 638 City liall St. Paul, Minnesota 55102 Mr. Kenneth D:ugan Environmental Planning Consultant Office of City Planner Grace Building 421 Wabasha Street St. Paul, Minnesota 55102 Sandra S. Gardcoring, Esquire Special Assistant Attorney General FEnnesota Pollution Control Agency 1935 W. County Road B2 Roseville, Minnesota 55113 I

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