ML20093A375
| ML20093A375 | |
| Person / Time | |
|---|---|
| Site: | Quad Cities  |
| Issue date: | 07/02/1984 |
| From: | Rybak B COMMONWEALTH EDISON CO. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20093A376 | List: |
| References | |
| 8895N, GL-84-11, NUDOCS 8407100403 | |
| Download: ML20093A375 (5) | |
Text
{{#Wiki_filter:. ' /] Commonwealth Edison [ .) one First National Plan Chicgo. llhnois ( O } Addrrss R; ply to: Post Offica Box 767 Chicago, Illinois 60690 \\ i July 2, 1984 i Mr. Harold.R. Denton, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, DC 20555
Subject:
Quad Cities Station Unit 1 IGSCC Weld Inspection Results NRC Docket No. 50-254 Reference (a): B. Rybak letter to H. R. Denton i dated March 19, 1984.
Dear Mr. Denton:
Ultrasonic inspection and repair of the stainless steel piping for Quad Cities Unit 1 has now been completed. Commonwealth Edison performed the inspection in accordance with our letter of March 19, 1984 (Reference (a)), The sampling plan used for Quad ' Cities Unit 1 was based on SECY-83-267C and in substantive agreement with Generic Letter 84-11. A meeting with your staff to present our inspection results was held on June 8. This letter contains our formal submittal summarizing our inspection results and contains additional information requested by your staff to prior, during and i after our meeting. This information is submitted in support of our request for NRC concurrence to operate Quad Cities Unit 1 for the next fuel cycle. A total of 128 welds were inspected; 18 welds were found [ l w*.th flaw indications. O? these 18 welds, all but one had axial i indications. Conssouently, 16 welds were overlaid. As for the [ other two welds, 028S-S9 and 0285-012, two different remedies were employed. For 028S-S12, the flaws were removed by core drilling out the two axial indications and the repair completed by welding on 1-5/16 inch half-couplings. Weld 02BS-S9 has two short circumferen-t tial indications which Commonwealth Edison has dispositioned as l-possible crack indications. This disposition is conservative as I . Kraft Werke Union (KWU), who was employed to discriminate all welds having circumferential crack indications, determined that these specific reflectors were not cracks but metallurgical reflectors. Nevertheless, we had our architect-engineer, Nutech Engineers perform a flaw analysis which found the weld acceptable as found. Additionally, this weld has been IHSled. 8407100403 040702
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DR ADOCK 05000
'H. R. Denton July 2, 1984 Finally, for information only, Commonwealth Edison has . installed a Pipelock, as designed by O'Donnell and Associates on a twelve inch riser weld 02M-S3. This weld has an overlay which was applied during this outage. 'If you have any questions regarding this matter, please contact this office. One signed original and forty (40) copies of this letter and the attachments are provided for your use. Very truly yours, fb o B. Ry Nuclear Licensing Administrator 1m cc: R. Bevan - NRR NRC Resident Inspector - Quad Cities Attachments 8895N L
p- .y, u F e _a .= ATTACHMENT A OVERALL WEL's INSPECTION
SUMMARY
QUAD CITIES UNIT 1 SPRING, 1984 OUTAGE 4 I i 8895N'
OVERALL INSPECTION SlM4ARY TYPE 304 STAIPLESS STEEL PIPING 4" APO GREAltM DIAltitM QUAD CITIES UNIT 1 SPRING 1984 TOTAL ELDS CRACK WELDS SYSTEMS EXAMIED WLOS EXAMIED INDICATIONS OVERLAYED CIRCLLATION RISERS (12") 51 43 14-14 RINGEADER (22"). 18 12 2 2 OUTLETS (28") 34 33 2 01 BYPASS STLBS (4") 8 4 0 0 RESIDUAL EAT REMOVAL LPCI (16") 32 9 0 0 SD C00_ING (20") 17 6 0 0 HEAD SPRAY (4") 13 4 0 0 CORE SPRAY (10") 32 7 0 0 REACTOR WATER 7 4 0 0 CLEANLP (6") HEAD VENT (4") 3 3 0 0 CRD RETURN (4") 3 3 0 0 TOTAL 218 128 18 16 1 ETALLURGICAL SAWLING REMOVED THE CRACK INDICATIONS FROM ONE WELD. TE TWO LOCATIONS WERE. ? AIRED WITH HALF COUPLINGS. TE SECOPO ELD WITH "POSSIELE CRACKS" WAS ACCEPTABLE WITHOUT REPAIR BY FRACTURE KCHANICS EVALUATION. 04088/30
Q. 4 I ATTACHMENT B IGSCC FLAW EVALUTION/ DISPOSITION QUAD CITIES UNIT 1 b 8895N --r =}}