ML17191A719
| ML17191A719 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 06/10/1998 |
| From: | Rossbach L NRC (Affiliation Not Assigned) |
| To: | Kingsley O COMMONWEALTH EDISON CO. |
| References | |
| TAC-MA1672, NUDOCS 9806150125 | |
| Download: ML17191A719 (4) | |
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-e Mr. Oliver D. Kingsley, President Nuclear Generation Group Commonwealth Edison Company Executive Towers West Ill 1400 Opus Place, Suite 500 Downers Grove, IL 60515 June 1 O, 1998
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION (RAI) FOR DRESDEN NUCLEAR.
POWER STATION, UNIT 2 (TAC NO. MA1672)
Dear Mr. Kingsley:
By letter dated April 1_1, 1998 *. Comm~nwealth Edison Company (ComEd) submitted the I
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- report titled "Dresden Unit 2 JeLPu-mp.15/16 Rise;_\\N~ld F_law Evaluatiori 1Report" dated
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. April 10, 1998. Based on the evalu~tions pr~sent~d)n ~his'report,':CoryiEd_ cle~ermined that a flaw
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in weld RS-1 of Jet Pump.15/16 does r;i~r'ppse a ~afety;c~11.c~m for the;next two fuel *cycles. The t
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staff has reviewed this report and has determined that ~dd.iti.onal information is necessary.
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'l Please provide the information-'in the enclosed request within 30*:days from receipt of this letter.
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I Should you. have any que~tion_s, piease.contact me at (301) 415~2863...,
Sin~erely,
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ORIG. SIGNED BY Lawrence W. Rossbach, Project Manager Project Directorate 111-2 Docket No. 50-237
Enclosure:
RAI cc w/encl: See next page Division of Reactor Projects - Ill/IV Office of Nuclear Reactor Re~ulation Distribution: ' Docket File PUBLIC PDlll-2 r/f E. Adensam, EGA 1 ACRS, T2E26
- c. Moore L. Rossoach OGC, 015B18 S. Richards M. Ring, Riii DOCUMENT NAME: G:\\CMNTSP\\DRESDEN\\DR1672.RAI
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To receive a copy of this document, indicate in the box: "C" = Copy without enclosures "E" = Copy with enclosures "N" = No copy OFFICE PM:PDlll-2 E
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D:PDlll-2 NAME.
DATE LROSSBAC
--'~CMOORE oR SRICHARDS 06/ 3 198 06/ 'I /98 061 JD 198 OFFICIAL RECORD COPY.
9806150125 980610'. ; ~r:. [Jl PDR ADOCK 05000237 p
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UNITED STATES NUCLEAR REGULATORY COMMISSION Mr. Oliver D. Kingsley, President Nuclear Generation Group Commonwealth Edison Company Executive Towe rs West Ill 1400 Opus Place, Suite 500 Downers Grove, IL 60515 WASHINGTON, D.C. 2061515. 0001 June 10, 1998
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION (RAI) FOR DRESDEN NUCLEAR POWER STATION, UNIT 2 (TAC NO. MA1672)
Dear Mr. Kingsley:
By letter dated April 11, 1998, Commonwealth Edison Company (Com Ed) submitted the report titled "Dresden Unit 2 Jet Pump 15/16 Riser Weld Flaw Evaluation Report" dated April 10, 1998. Based on the evaluations presented in this report, ComEd determined that a flaw in weld RS-1 of Jet Pump 15/16 does not pose a safety concern for the next two fuel cycles. The staff has reviewed this report and has determined that additional information is necessary.
Please provide the information in the enclosed request within 30 days from receipt of this letter.
Should you have any questions, please contact me at (301) 415-2863.
Docket No. 50-237
Enclosure:
RAI cc w/encl: See next page Sincerely, o?1 ~l--./!~
Lawrence W. Rossbach, Project Manager Project Directorate 111-2 Division of Reactor Projects - Ill/IV Office of Nuclear Reactor Regulation
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- 0. Kingsley 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 6500 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 Downers 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 D()wners 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
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REQUEST FOR ADDITIONAL INFORMATION RELATED TO DRESDEN UNIT 2 JET PUMP 15/16 RISER WELD FLAW EVALUATION REPORT 1 ~.
Measurement uncertainty (Page 8) - Provide the measurement uncertainty used in determining the measured flaw length. Explain how the uncertainty was established.
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. Z factor calculation (Page 9 of Attachment A) - The staff will consider the use of the proposed alternative Z factor calculation as a long-term issue. Use 24" for the "OD" as specified in the ASME Code, and revise your analysi.s.
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- Z factor calculation (Page 9 of Attachment A) - On page 9 it was~stated that, "The examples of flux welds are submerged arc welds (SAW) and shielded metal arc welds (SMAW)." and "Since a non-flux process (SMAW) was specified for only part of the weld, it must be assumed that the welds are flux welds." However, the Z formula for non-flux process welds was still presented as the orie used by GE. Clarify and explain if there was a typo in the text or a mistake in the Z factor calculation.
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Crack growth evaluation (Page 10 of Attachment A)- Instead of providing the allowable crack size due to flow induced vibration (FIV), provide the crack growth due to FIV in two fuel cycles to be added to the evaluated flaw length of 4.7".