ML17059C211
| ML17059C211 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 08/24/1998 |
| From: | Hood D NRC (Affiliation Not Assigned) |
| To: | Mueller J NIAGARA MOHAWK POWER CORP. |
| References | |
| TAC-MA2286, NUDOCS 9808270095 | |
| Download: ML17059C211 (8) | |
Text
August 24, 1998
'. Mr. John H. Mueller Chief Nuclear Officer Niagara Mohawk Power Corporation Nine Mile Point Nuclear Station Operations Building, Second Floor P.O. Box 63 Lycoming, NY 13093
SUBJECT:
REQUEST FOR ADDITIONALINFORMATION REGARDING CORE SHROUD EVALUATIONFROM REFUELING OUTAGE 6 (RFO6) - NINE MILEPOINT NUCLEAR STATION UNIT NO. 2 (TAC NO. MA2286)
Dear Mr. Mueller.
By letter dated July 9, 1998, you submitted results of the inspections of the core shroud during RFO6 at Nine Mile Point Nuclear Station Unit 2 (NMP2). You also provided the evaluation that was performed to support continued operation of NMP2. The NRC staff is reviewing your submittal and finds that the following additional information is needed:
For the compound flaw at horizontal weld H4, you apply a stress intensity factor formula, Equation (4-1), which is applicable for R/t values ranging from 5 to 10. Please provide details supporting your following statement:
"The R/t value for the shroud geometry is approximately 50. However, a review of available analytical solutions for through-wall and part-through-wall circumferential cracks showed that the stress intensity factor predictions of Equation (4-1) are conservative.
Therefore, the use of Equation (4-1) for this evaluation was justified."
Your response to this letter is requested within 45 days of its receipt.
Ifyou should have any questions regarding this request or are unable to meet the requested response schedule, please contact me by phone on (301) 415-3049 or by electronic mail at dshOnrc.gov.
Sincerely, Original Signed by:
Darl S. Hood, Senior Project Manager Project Directorate I-1 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation Docket No. 50-220 cc: See next page DISTRIBUTION:
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August 24, 1998
- Mr. John H. Mueller Chief Nuclear Officer Niagara Mohawk Power Corporation Nine Mile Point Nuclear Station Operations Building, Second Floor P.O. Box 63 Lycoming, NY 13093
SUBJECT:
REQUEST FOR ADDITIONALINFORMATION REGARDING CORE SHROUD EVALUATIONFROM REFUELING OUTAGE 6 (RFO6) - NINE MILEPOINT NUCLEAR STATION UNIT NO. 2 (TAC NO. MA2286)
Dear Mr. Mueller.
By letter dated July 9, 1998, you submitted results of the inspections of the core shroud during RFO6 at Nine Mile Point Nuclear Station Unit 2 (NMP2). You also provided the evaluation that was performed to support continued operation of NMP2. The NRC staff is reviewing your submittal and finds that the following additional information is needed:
For the compound flaw at horizontal weld H4, you apply a stress intensity factor formula, Equation (4-1), which is applicable for R/t values ranging from 5 to 10. Please provide details supporting your following statement:
"The R/t value for the shroud geometry is approximately 50. However, a review of available analytical solutions for through-wall and part-through-wall circumferential cracks showed that the stress intensity factor predictions of Equation (4-1) are conservative.
Therefore, the use of Equation (4-1) for this evaluation was justified."
Your response to this letter is requested within 45 days of its receipt.
Ifyou should have any questions regarding this request or are unable to meet the requested response schedule, please contact me by phone on (301) 415-3049 or by electronic mail at dsh@nrc.gov.
Sincerely, Original Signed by:
Darl S. Hood, Senior Project Manager Project Directorate I-1 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation Docket No. 50-220 cc: See next page DISTRIBUTION:
Docket File SBajwa PUBLIC SLittle PDI-1 R/F DHood JZwolinski (A)
CSheng OGC RHerm ann ACRS KWichman LDoerflein, Rl CCarpenter ESullivan DOCUMENT NAME: G:>NMP1>NM2A2286.RAI To receive a copy of this document, indicate in the box: "C" = Copy without attach nt/enclosure "E" = Copy with attachment/enclosure "N"= No co OFFICE HAHE DATE PH:PDI-1 DHood/rsi 08/
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 August 24, 1998 Mr. John H. Mueller Chief Nuclear Officer Niagara Mohawk Power Corporation Nine Mile Point Nuclear Station Operations Building, Second Floor P.O. Box 63 Lycoming, NY 13093
SUBJECT:
REQUEST FOR ADDITIONALINFORMATION REGARDING CORE SHROUD EVALUATIONFROM REFUELING OUTAGE 6 (RFO6) - NINE MILEPOINT NUCLEAR STATION UNIT NO. 2 (TAC NO. MA2286)
Dear Mr. Mueller:
By letter dated July 9, 1998, you submitted results of the inspections of the core shroud during RFO6 at Nine Mile Point Nuclear Station Unit 2 (NMP2). You also provided the evaluation that was performed to support continued operation of NMP2. The NRC staff is reviewing your submittal and finds that the following additional information is needed:
For the compound flaw at horizontal weld H4, you apply a stress intensity factor formula, Equation (4-1), which is applicable for R/t values ranging from 5 to 10. Please provide details supporting your following statement:
"The R/t value for the shroud geometry is approximately 50. However, a review of available analytical solutions for through-wall and part-through-wall circumferential cracks showed that the stress intensity factor predictions of Equation (4-1) are conservative.
Therefore, the use of Equation (4-1) for this evaluation was justified."
Your response to this letter is requested within 45 days of its receipt.
Ifyou should have any questions regarding this request or are unable to meet the requested response schedule, please contact me by phone on (301) 415-3049 or by electronic mail at dsh@nrc.gov.
Sincerely, 8~~/~
Darl S. Hood, Senior Project Manager Project Directorate l-1 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation Docket No. 50-220 cc: See next page
0
John H. Mueller Niagara Mohawk Power Corporation CC:
Regional Administrator, Region I
U. S. Nuclear Regulatory Commission
'75 Allendale Road King of Prussia, PA 19406 Resident Inspector Nine Mile Point Nuclear Station P.O. Box 126 Lycoming, NY 13093 Mr. Jim Rettberg NY State Electric 8 Gas Corporation Corporate Drive Kirkwood Industrial Park P.O. Box 5224 Binghamton, NY 13902-5224 Mr. John V. Vinquist, MATS Inc.
P.O. Box 63 Lycoming, NY 13093 Supervisor Town of Scriba Route 8, Box 382 Oswego, NY 13126 Mr. Richard Goldsmith
- Syracuse University College of Law E.l. White Hall Campus
- Syracuse, NY 12223 Nine Mile Point Nuclear Station Unit No. 2 Charles Donaldson, Esquire Assistant Attorney General New York Department of Law 120 Broadway New York, NY 10271 Mr. Timothy S. Carey Chair and Executive Director State Consumer Protection Board 5 Empire State Plaza, Suite 2101 Albany, NY 12223
. Mark J. Wetterhahn, Esquire Winston 8 Strawn 1400 L Street, NW.
Washington, DC 20005-3502 Gary D. Wilson, Esquire Niagara Mohawk Power Corporation 300 Erie Boulevard West
- Syracuse, NY 13202 Mr. F. WilliamValentino, President New York State Energy, Research, and Development Authority Corporate Plaza West 286 Washington Avenue Extension Albany, NY 12203-6399
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