ML17191A887
| ML17191A887 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 09/23/1998 |
| From: | Rossbach L NRC (Affiliation Not Assigned) |
| To: | Kingsley O COMMONWEALTH EDISON CO. |
| Shared Package | |
| ML17191A888 | List: |
| References | |
| TAC-M98954, NUDOCS 9809250001 | |
| Download: ML17191A887 (3) | |
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UNITED STATES NUCLEAR REGULATORY COMMISSION Mr. Oliver D. Kingsley, President Nuclear Generation Group
- Commonwealth Edison Company Executive Towers West Ill 1400 Opus Place, Suite 500 Downers Grove, IL 60515 WASHINGTON, p.C. 20555-4001 September 23, 1998
.-~.,-. **
SUBJECT:
CORE SHROUD FLAW EVALUATION FOR DRESDEN NUCLEAR POWER STATION, UNIT 3 (TAC NO. M98954)
Dear Mr. Kingsley:
By letter dated May 23, 1997, Commonwealth Edison Company (ComEd) submitted, for NRC review, the results of core shroud examinations completed in April 1997, for Dresden, Unit 3. No reportable indications were found in the axial welds examined. However, the ring segment weld examination identified circumferential cracking in the H2, H3, and HS welds, and two composite "T" shape flaws in the vicinity of the support ring segment welds. The May 23, 1997, submittal included the associated flaw evaluation for the detected flaws to demonstrate that the unit could be operated without repair for four fuel cycles. By letter dated July 2, 1998, ComEd submitted calculation CMED-060298, an analytic flaw evaluation for the two composite flaws.
The staff has completed its review of these submittals and identified a minor error regarding the safety factors used in the limit load analysis in CMEQ..060298 prepar~d by your contractor.
However, the error does not affect the final results and the conclusion of the submittal. Except
- for this error, the staff concluded that the flaw evaluation is in accordance with the American Society of Mechanical Engineers Boiler and Pressure Vessel Code. Since the error does not
. affect the final results of the submittal, the staff concludes that Dresden, Unit 3, can continue to operate without repair of the identified flaws for four fuel cycles. The staffs safety evaluation is enclosed.
This completes our actions with respect to TAC No. M98954.
Docket No. 50-249
Enclosure:
Safety Evaluation cc w/encl: See next page_
Sincerely,
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Lawrence W. Rossbach, Project Manager
- Project Directorate 111-2 Division of Reactor Projects - Ill/IV Office of Nuclear Reactor Regulation
(. __ J _ -- _9809g50001 980923. '
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- 0. Kingsley Mr. Oliver D. Kingsley,'. President *,,
Nuclear Generation.. G~oup Commonwealth Edis6.n *company Executive Towers West 111 1400 Opus Place, S\\iite 500 Downers Grove, IL* 60515, September 23, 1998
SUBJECT:
CORE SHROUD FLAW EVALUATION Fo'R DRESDEN NUCLEAR POWER STATION, UNIT 3 (TAC No'. M98954).
Dear Mr. Kingsley:
By letter dated May 23, 1997, Commonwealth.~dison Compa~y (ComEd) submitted, for NRC.
review, the results of core shroud examinations complet!;!d lri April 1997, for Dresden, Unit 3. No reportable indications were found in the axial welds:examined. However, the ring segment weld examination identified circumferential cracking in',the H2, H3, and HS welds, and two composite "T" shape flaws in the vicinity of the support nng segment welds. The May 23, 1997 I submittal included.the associated fla,w evaluation for the detected flaws to demonstrate that the unit could be operated without repair for four fuel cycles. By letter dated July 2, 1998, ComEd submitted calculation CMED-060298, an analytic flaw evaluation for the two composite flaws.
The staff has completed its review of these submittals and identified a minor error regarding the safety factors used in the limit load analysis in CMED-060298 prepared by your contractor.
However, the error does not affect the final results and the conclusion of the submittal. Except for this error, the staff concluded that the flaw evaluation is in accordance with the American
- Society of Mechanical Engineers Boiler and Pressure Vessel Code. Since the error does not affect the final results of the submittal, the staff concludes that Dresden, Unit 3, can continue to operate without repair of the identified flaws for four fuel cycles. The staffs safety evaluation is enclosed.
.. This completes our actions with respect to TAC No. M98954.
Sincerely, ORIG. SIGNED BY Lawrence W. Rossbach, Project Manager Project Directorate 111-2 I
Division of Reactor Projects - Ill/IV
\\ I Office of Nuclear Re~ctor Regulation cD (0 /
Docket No, 50-249 DISTRIBUTION:
Enclosure:
Safety Evaluation Docket File PUBLIC THarris (SE ONLY)
PDlll-2 RIF EAdensam, EGA 1 KWichman cc w/encl: See next page SRichards CMoore LRossbach OGC, 0-15B18 MRing, Riii ACRS, T-2E26 DOCUMENT NAME: G:\\CM\\DRESDEN\\DR98954.LTR
- Concurrence provided by 7/23/98 SE To receive a copy of this document. indicate in tho b x: "C" = Cop without enclosures "E" = Copy with enclosures "N" = No copy OFFICE PM:PDlll-2 NAME DATE LROSSBAC
- 09/ t.-/ /98
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D:PDlll-2 KWICHMAN*
SRI CHARDS 07/23/98 09/ l-:3 /98 OFFICIAL RECORD COPY
- 0. Kingsley
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Commonwealth Edison Company cc:
Michael I. Miller, Esquire Sidley and Austin One First National Plaza Chicago, Illinois 60603 Commonwealth Edison Company Site Vice President - Dresden 6500 N. Dresden Road Morris, Illinois 60450-9765 Commonwealth Edison Company Dresden Station Manager 6500 N. Dresden Road Morris, Illinois 60450-9765 U.S. Nuclear Regulatory Commission Dresden Resident Inspectors Office 6500 N. Dresden Road Morris, Illinois 60450-9766 Regional Administrator U.S. NRC, Region Ill 801 Warrenville Road Lisle, Illinois 60532-4351 Illinois Department of Nuclear Safety Office of Nuclear Facility Safety 1035 Outer Park Drive Springfield, Illinois 62704 Chairman Grundy County Board Administration Building 1320 Union Street Morris, Illinois 60450 Document Control Desk-Licensing Commonwealth Edison Company 1400 Opus Place, Suite 400 Downers Grove, Illinois 60515 Commonwealth Edison Company Reg. Assurance Supervisor - Dresden 6SOO N. Dresden Road Morris, Illinois 60450-9765 Dresden Nuclear Power Station Units 2 and 3 Mr. David Helwig Senior Vice President Commonwealth Edison Company Executive Towers West Ill 1400 Opus Place, Suite 900 Downers Grove, IL 60515 Mr. Gene H. Stanley PWR's Vice President Commonwealth Edison Company Executive Towers West Ill
. 1400 Opus Place, Suite 900 DoWriers Grove, IL 60515 Mr. Steve Perry BWR's Vice President Commonwealth Edison Company Executive Towers West Ill 1400 Opus Place, Suite 900 Downers Grove, IL 60515 Mr. Dennis Farrar Regulatory Services Manager Commonwealth Edison Company Executive Towers West Ill 1400 Opus Place, Suite 500 Downers Grove, IL 60515 Ms. Irene Johnson, Licensing Director Nuclear Regulatory Services Commonwealth Edison Company Executive Towers West Ill 1400 Opus Place, Suite 500 Downers Grove, IL 60515 Mr. Michael J. Wallace.
Senior Vice President Commonwealth Edison Company Executive Towers West Ill 1400 Opus Place, Suite 900 Downers Grove, IL 60515