ML20126H876

Notifies Formally That 74 Stainless Steel Welds Inspected Ultrasonically During Current Refueling Outage.Two Welds Considered to Have Crack Indications Overlayed.Of 13 Welds W/Prior Crack indications,1 Merits Overlay

ML20126H876
Person / Time
Site:	Quad Cities
Issue date:	05/31/1985
From:	Rybak B COMMONWEALTH EDISON CO.
To:	Harold Denton Office of Nuclear Reactor Regulation
References
0200K, 200K, NUDOCS 8506100445
Download: ML20126H876 (2)

Text

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- Commonwealth Edison d one Fir 1 National Plaz', Chicago, Ilhnon Address Reply to: Post Othee Box 767 Chicago, Illinois 60690 May 31, 1985 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, DC 20555

Subject:

Quad Cities Station Unit 2 Inspection of Stainless Steel Welds NRC Docket No. 50-265 Reference (a): B. Rybak letter to H. R. Denton dated December 15, 1984.

Dear Mr. Denton:

By this letter Commonwealth Edison is formally notifying the NRC that 74 stainless steel welds were ultrasonically inspected during the current Quad Cities thit 2 refuelina outage, 34 in the recirculation

, system. Two welds (Nos. 02E-F6A anc 02M-F7) which showed no reportable crack indications during the last inspection are now considered to have crack indications and were overlayed.

Of the 13 welds with previously identified crack indications Commonwealth Edison determined that I weld, No. 02M-S3, showed significant change to merit an overlay application. The NRC raised concerns on two other welds (Nos. 105-F5 and 02AS-S4) which were previously identified as cracked and based on subsequent discussions a decision was made to overlay these two welds raising the total to 5 welds overlayed this outage.

As noted in Reference (a), Commonwealth Edison believes that a meaningful UT inspection cannot be performed on overlayed welds. The nine previously overlayed welds were visually inspected during the hydrostatic test and three welds (Nos. 02D-F6, 02F-F6 and 02BS F7) were examined by use of the EPRI Minac system. Finally, Commonwealth Edison ultrasonically inspected the overlay material on weld No. 02D-F6. No adverse indications were noted in any of the examinations.

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% R. Denton~ -2' May 31, 1985

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. One signed original and forty (40) copies of this letter is provided for- your use. .

Very truly yours, I

B. Rybak Nuclear Licensing Administrator 1m cc: R.'8evan - mR WC Resident Inspector - QC 0200K