ML20129B721
| ML20129B721 | |
| Person / Time | |
|---|---|
| Site: | Quad Cities  |
| Issue date: | 05/30/1985 |
| From: | Rybak B COMMONWEALTH EDISON CO. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| 0188K, 188K, NUDOCS 8506050308 | |
| Download: ML20129B721 (5) | |
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Commonwenith Edison One Fast National Plaza, Chicago. lihnois Address Reply to: Post Office Box 767 Chicago. tilinois 60690 May 30, 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 Weld Overlay Design Information NRC Docket No. 50-265
Dear Mr. Denton:
Enclosed as an attachment to this letter is specific information related to the five weld overlays done during the current Quad Cities Unit 2 refueling outage.
Overlay dimensions are provided for all five welds.
Also the residual stress distribution and predicted flaw growth for two weld overlays nos. 10S-F5 and 0?AS-SA are provided.
One signed original and forty (40) copies of this letter and.its attachment is provided for your use.
Very truly yours, bei
'v B. R Nuclear Licensing Administrator 1m Attachment cc:
R. Bevan - NRR NRC Resident Inspector - QC (0
0506050308 850530 1
PDR ADOCK 05000265 G
PDR 0188K L.
- 7.
ATTACHMENT.
Q.UAD CITIES UNIT 2 WELD OVERLAY INFORMATION i
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TABLE 1 WELD OVERLAY ' REPAIR DIMENSIONS '
SPRING 1985 OUTAGE OUAD CITIES UNIT 2 Actual Weld ID Length Length
' Design Overlay.
Overlay Thickness Design Overlay Actual Overlay Thickness Upstream / Downstream 02E-F6A
'4.50" 4.5" 0.208" 0.22"/0'.201" 0 2tt-S 3 4.0"
~ 5.0" 0.208" 0.253"/0.256" 0 2ft-F7 3.0" 3.44" 0.208" 0.242"/0,284"'
1US-F5 2.5"III 2.5"
.Two Layers NA(2)/0.156" 02AS-S4 7.0" 8.0" Two Layers 0.173"/0.181" Notes:
1.
. From centerline of. weld going away, from -valve.
2.
Valve side of weld.
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n TABLE 2 PREDICTED FLAW GROWTH (
FOR ONE FUEL CYCLE QUAD CITIES UNIT 2 Beginning-Predicted Predicted Predicted of-Cycle Flaw Depth Flaw Depth Flaw Depth Allowable Flaw Depth Ratio w/o Ratio w/
Ratio w/
Flaw Depth Weld ID Ratio Mitigation IHSI Mitigation Overlay Mitigation Ratio (2 )
10S-F5 0.17 (3) 0.17 0.19 0.47 02As-s4 0.20 0.36 0.20 0.20 0.48 NOTES:
1.
All flaws assumed to be 360* in circumferential length.
2.
Allowable flaw depth ratio is 2/3 of Table IWB-3641-1 allowable depth ratios.
3.
Will grow through-wall in less than one fuel cycle.
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