ML20058K707

Ler:On 750217,discovered Snubber Located Outside Drywell on Isolable Section of Shutdown Cooling Suction Line Inoperable Due to Loss of Oil.Affected Part Replaced

ML20058K707
Person / Time
Site:	Monticello
Issue date:	02/27/1975
From:	Day B, Mayer L NORTHERN STATES POWER CO.
To:	Giambusso A NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
LER-LER-750227, NUDOCS 9102130524
Download: ML20058K707 (2)

Text

CONTROL BLOCX:[ l l l l l l [CLEA".E PRINT ALL EE!UIRED INFORMSTION) 1 6 i NAME LCENSE NUMBEA E TYPE

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[OTil l SHUTDawN COOLING SUCTION LINE DISCOVERED INOPERAELE DUE TO LOSS OF OIL. l 7 89 80 gg l VALVES UPSTREA'10F AFFECTED PIPE ARE CLOSED DURING NORMAL OPERATION. ONE PFH IOUS l O fSIMILARCCCURRENCE. AFFECTED PART REPLACED IN KIND. (A0 263/75-07) 8]

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PUBLICITY 1 l NA l 7 89 80 ADDITIONAL FACTORS na i NA l 7 89 80 19 l l 7 89 80 NAVE m D. W mgy7 f.2/295-5151 GPC 801 587 9102130524 750227 CF ADOCK 05000263 CF _.._. _ . . _ _ ,

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NORTHERN STATES POWER COMPANY Minneapolis, Minnesota 55401 February 27, 1975

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Mr. A. Giambusso, Director Division of Reactor Licensing U S Nuclear Regulatory Comission Washingten, D. C. 20555

Dear Mr. Giambusso:

mXIICELLO NUCLEAR GEFEFATING PLuT Docket No. 50-263 License No. DPR-22 Licensee Event Report to the NRC Inoperable Hydraulic Shock Suppressor ,

ne Licensee Event Report for this occurrence is reproduced on the back of this letter.

In addition, two suppressors located on the HPCI system were found to be leaking oil. Inspection of the snubbers indicated that the leaks were caused by cut or defomed seals which apparently occurred during assembly of the suppressors. Also sand was found in the accumulators of the two suppressors which were on the HPCI system. These two suppressors and other suppressors originally purchased for installation associated with the addition of the four relief valves and the PRT System were sandblasted and repaintec prior to ship-ment to the site. It is believed that the sand entered the accunulator blocks during the sandblasting operation. Inspections of other snubbers that fit this category to-date, have revealed no detrinental effects. It is planned to renove a representative sample of this group of snubbers during the next refuel-ing cutage for detailed inspection.

Yours very truly, dz'd. '

L. O. Mayer, PE -

Manager of Nuclear Support Services II?Vkik I cc: J G Keppler G Charnoff Minnesota Pollution Control Agency

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Attn: E A Pry:ina n ; 7n Ls *~