ML20058K603

Ro:On 740412,cracked Tee Noted in SLCS During non- Destructive Exam of Socket Weld on Standby Liquid Control Peeco Flow Switch.Postulated Indications Created in Mfg Process.Corrective Action:Remove Indications

ML20058K603
Person / Time
Site:	Monticello
Issue date:	04/22/1974
From:	Mayer L NORTHERN STATES POWER CO.
To:	Oleary J US ATOMIC ENERGY COMMISSION (AEC)
References
NUDOCS 9102120623
Download: ML20058K603 (1)

Text

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NORTHERN STATES POWER COMPANY l

MIN N E A PO LI S. MIN N E S OTA 55401 April 22, 1974

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Mr. J F O' Leary /

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Directorate of Licensing / -

Office of Regulation .

f gI U S Atomic Energy Commission  !$] p,p h L.h Washington, DC 8 @Q '

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Dear Mr. O' Leary:

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/ fs MONTICELID NUCLEAR GENERATING PIANT Docket No. 50-263 License No. DPR-22

/ %. b' L Cracked Tee in Standbv Liquid Control System A condition occurred at the Monticello Nuclear Generating Plant which we are reporting to your office in accordance with Section 6.7.B.1, Abnormal Occurrence Reports, of Appendix A, Technical Specifications, of Provisional Operating License DPR-22.

On April 12, 1974, while performing a non-destructive examination (Dye k Penetrant test) of a socket veld on a Standby Liquid Control PEECO flow -

switch (following removal of the flow switch actuator paddle) two indications were found in the stainless steel tee associated with the flow switch.

The depth of the indications was explored and it was determined that they were non-injurious (as defined in the Specification for Wrought Austentic Stainless Steel Piping Fittings, SA-403, in the ASME Soiler and Pressure Vessel Code,Section II). The indications were removed during the exploration. It is postulated that the indications were created in the manufacturing process.

No other indications have been detected in Standby Liquid Control _Sy. stem piping in the past and, because of the non-injurious nature of the indications discovered on April 12, no further inspection is considered.necessarv.

~ %~ 'e' r Very truly yours.  ; -

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7 L 0 Mayer, PE V.

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s f/ g Director of Nuclear Support Services . xy1

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LOM/lh 9102120623 740422:

CF ADDCK 05000263 cc: J G Keppler CF; G Charnoff '

Minnesota Pollution Control Agency Oy77 Attn. E A Pryzina

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