ML20058K652

Responds to Dro Bulletin 74-10A.Welds Reevaluated.No Unacceptable Indications Found

ML20058K652
Person / Time
Site:	Monticello
Issue date:	12/23/1974
From:	Wachter L NORTHERN STATES POWER CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
IEB-74-10, NUDOCS 9102130417
Download: ML20058K652 (2)

Text

f NORTHERN STATES POWER COMPANY M 8 N N E A PO LI S. M I N N E B OTA 55401 December 23, 1974

'i Mr J G Keppler p Regional Director 3 Directorate of Regulatory Operations Region III gf, United States Atomic Energy Commission ~ -4_ v -

799 Roosevelt Road Glen Ellyn, Illinois 60137 ~~'

!J.: : q ..

Dear Mr Keppler:

MONTICELLO NUCLFiR CENERATING PLANT DOCKET 50-263 LICESSE DPR-22 In reply to your recent DRO Bulletin No.74-10A, dated December 17, 1974 our position is that we have complete confidence in our November 9, 1974 inspec-tien of the 4-inch diameter bypass loops and its evaluation for Monticello Nuclear Generating Plant. ,

At that time we had ultrasonically examined all welds in the 4-inch bypass lecp to connly with your ERO Eulletin No. 75-10, dated September 19, 1974 Our inspection technique included the recording of the ultrasonic signais on analog strip chart. The strip charts provided permanent records that clearly show the location and amplitude of any discontinuity within the weld, as well as the calibration that was performed prior and after each weld inspection. (This permits a review and evaulation of the inspection '

without viewing the displav on the ultrasonic instrumenti.

In addition to the evaluation performed by the inspection team during the inspection, the inspection reports and strip charts were reviewed by an evaluation team, comprised of Northern States Power Company's and the inspection agency's GDT Level III examiner and an Authorized Code Inspector.

It is also appropriate to r.ention that two of your compliance inspectors were present and reviewed our inspection program.

At that tire our evaluation ohawed no unacceptabic indications. To comply l with your request we reevaluated the results and found the original results valid in all respects.

9102130417 74122, 13069 CF ADOCK 05000263 CF ny y

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NORTH' 'IN STATES POWER COMF' NY December 23, 1974 sppler inspections completed during the November 9,1974 outage incurred

, proximately 10 man Rems of personnel exposures. The January refueling

utage is scheduled to commence approximately 60 days subsequent to that inspection. With prior knouled

e of the recent Dresden II findings, ue had included reinspection of the four velds of bypass loop pipe to weldolets as part of the inservice inspection plan vork to be implemented in the January ,

1975 refueling outage.

We will consider reinspecticn of additional bypass line velds during this refueling outage. IIouever, en the basis of the scope and results of our

ovember 9, 1974 inspection, and the more recent reevaluation of those inspection results we believe our present plans far inspections during the January 1975 outage are appropriate.

Instructions have been issued to operating personnel to assure ccepliance with item 2.b. of the Bulletin. j Our inspection records are open for your review. If you would like to discuss our intended inspection plan, please contact us.

Yours very truly,

'f m n y , _z_

J G-

'l c 4 FC. ~

L J 'Ja6'n ter, Vice Pr'eshdent Power Production & System Operation LJJ/ma cc: dir E G Case Mr G Charnoff Minnesota Pollution Control Agency Attention: Mr E A Prycina Assistant Director for Construction and Operations - AEC l

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