ML20217Q557
| ML20217Q557 | |
| Person / Time | |
|---|---|
| Site: | Byron, Braidwood  |
| Issue date: | 05/01/1998 |
| From: | John Hickman NRC (Affiliation Not Assigned) |
| To: | Kinglsey O COMMONWEALTH EDISON CO. |
| References | |
| GL-96-06, GL-96-6, TAC-M96782, TAC-M96783, TAC-M96789, TAC-M96790, NUDOCS 9805080187 | |
| Download: ML20217Q557 (5) | |
Text
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..<w May 1~, 1998 Mr. Oliver D.' Kingsley, President.
. Nuclear Generation Group-Commonwealth Edison Company Executive Towers West ill
- 1400 Opus Place, Suite 500 y.
Downers Grove, IL 60515
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION REGARDING RESPONSE TO GENERIC LETTER 96-06 FOR ERAIDWOOD, UNITS 1 AND 2, AND BYRON,.
UNITS 1 AND 2 (TAC NOS. M96782, M96783, M96789 AND M96790)-
Dear'Mr. Kingsley:
~
NRC Generic Letter (GL) 96-06, " Assurance' of Equipment Operability and Containment Integrity.
During Design Basis Accident Conditions," dated September 30,1996, included the issue of.
thermally-induced pressurization of piping runs penetrating the containment. Commonwealth Edison Company (the licensee) responded to GL 96-06 by letters dated Januan; 28,1997, and May 2,1997.
j in its submittals, the licensee indicated that a total of 16 pipe' segments in each unit were susceptible to thermally-induced overpressurization.-The licensee also indicated that these-piping segments.would require design changes, procedural changes, draining or more detailed analysis. In order to complete its review of the licensee's response to the GL, we will require
' additional information as discussed in the enclosure.
Should you have any questions on this issue, please contact me at (301) 415-3017.
Sincerely, ORIG. SIGNED BY:-
John B. Hickman, Project Manager Project Directorate lll 2 Division of Reactor Projects - Ill/IV
. Office of Nuclear Reactor Regulation Docket Nos. STN 50-454, STN 50-455 STN 50-456, STN 50-457
~
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May 1, 1998 Mr. Oliver D. Kingsley, President Nuclear Generation Group Commonwealth Edison Company Executive Towers West 111 1400 Opus Place, Suite 500 Downers Grove, IL 60515
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION REGARDING RESPONSE TO GENERIC LETTER 96-06 FOR BRAIDWOOD, UNITS 1 AND 2, AND BYRON, UNITS 1 AND 2 (TAC NOS. M96782, M96783, M96789 AND M96790)
Dear Mr. Kingsley:
NRC Generic Letter (GL) 96-06, " Assurance of Equipment Operability and Containment Integrity During Design Basis Accident Conditions," dated September 30,1996, included the issue of thermally induced pressurization of piping runs penetrating the containment. Commonwealth Edison Company (the licensee) responded to GL 96-06 by letters dated January 28,1997, and May 2,1997.
In its submittals, the licensee indicated that a total of 16 pipe segments in each unit were susceptible to thermally-induced overpressurization. The licensee also indicated that these
~
piping segments would require design changes, procedural changes, draining or more detailed analysis. In order to complete its review of the licensee's response to the GL, we will require additional information as discussed in the enclosure.
Should you have any questions on this issue, please contact me at (301) 415-3017.
Sincerely, John B. Hickman, Project Manager Project Directorate lil-2 Division of Reactor Projects - lil/IV Office of Nuclear Reactor Regulation Docket Nos. STN 50-454, STN 50-455 STN 50-456, STN 50-457
Enclosure:
RAI cc w/ encl: See next page
r
. O. Kingsley Byron /Braidwood Stations Commonwealth Edison Company cc:
. Ms. C. Sue Hauser, Project Manager George L. Edgar Westinghouse Electric Corporation Morgan, Lewis and Bochius Energy Systems Business Unit 1800 M Street, N.W.
Post Office Box 355 Washington, DC 20036 Pittsburgh, Pennsylvania 15230 Attoiney General Joseph Gallo 500 S. Second Street Gallo & Ross Springfield, Illinois $2701 1250 Eye St., N.W., Suite 302 Washington, DC 20005 lilinois Department of Nuclear Safety Office of Nuclear Facility Safety Michael 1. Miller, Esquire 1035 Outer Park Drive Sidley and Austin Sprincfield, Illinois 62704 One First National Plaza Chicago, Illinois 60603 Commonwealth Edison Company Byron Station Manager Howard A. Leamer 4450 N. German Church Road Environmentallaw and Policy Byron, Illinois 61010-9794 Center of the Midwest 35 East Wacker Dr., Suite 1300 Commonwealth Edison Company Chicago, Illinois 60601 Site Vice President - Byron 4450 N. German Church Road U.S. Nuclear Regulatory Commission Byron, Illinois 61010-9794 Byron Resident inspectors Office 4448 N. German Church Road U.S. Nuclear Regulatory Commission Byron, Illinois 61010-9750 Braidwood Resident inspectors Office RR 1, Box 79 Regional Administrator, Region 111 Braceville, Illinois 60407 U.S. Nuclear Regulatory Commission 801 Warrenville Road Mr. Ron Stephens Lisle, Illinois 60532-4351 lilinois Emergency Services and Disaster Agency Ms. Lorraine Creek 110 E. Adams Street J
RR 1, Box 182 Springfield, Illinois 62706 Mantono, Illinois 60950 l
Chairman Chairman, Ogle County Board Will County Board of Supervisors Post Office Box 357 Will County Buard Courthouse Oregon, Illinois 61061 Joliet, Illinois 60434 Mrs. Phillip B. Johnson Commonwealth Edison Company 1907 Stratford Lane Braidwood Station Manager
'Rockford, Illinois 61107 RR 1, Box 84 Braceville, Illinois 60407
O. Kingsley Commonwealth Edison Company Byron /Braidwood Stations 1
Ms. Bridget Little Rorem
' Ms. Irene Johnson, Licensing Director Appleseed Coordinator Nuclear Regulatory Services 117 N. Linden Street Commonwealth Edison Company Essex, Illinois 60935 Executive Towers West lil 1400 Opus Place, Suite 500 Document Control Desk-Licensing Downers Grove, IL 60515 Commonwealth Edison Company i
1400 Opus Place, Suite 400 Commonwealth Edison Company Downers Grove, Illinois 60515 Reg. Assurance Supervisor-Braidwood RR 1, Box 79 Commonwealth Edison Company Braceville, Illinois 60407 Site Vice President - Braidwood RR 1, Box 64 Commonwealth Edison Company I
Braceville,IL 60407 Reg. Assurance Supervisor-Byron 4450 N. German Church Road Mr. David Helwig Byron, Illinois 61010-9794 Senior Vice President Commonwealth Edison Company Mr. Michael J. Wallace Executive Towers West til Senior Vice President 1400 Opus Place, Suite 900 Commonwealth Edison Company Downers Grove, IL 60515 Executive Towers West lil 1400 Opus Place, Suite 900 Mr. Gene H. Stanley Downers Grove, IL' 60515 PWR's Vice President Commonwealth Edison Company Executive Towers West lli 1400 Opus Place, Suite 900 Downers Grove,IL 60515 Mr. Steve Perry BWR's Vice President Commonwealth Edison Company Executive Towers West lil 1400 Opus Place, Suite 900 Downers Grove,IL 60515 Mr. Dennis Farrar Regulatory Services Manager Commonwealth Edison Company Executive Towers West til 1400 Opus Place, Suite 500 Downers Grove,IL 60515 1
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REQUEST FOR ADDITIONAL INFORMATION FOR RESOLUTION OF GENERIC LETTER 96-06 ISSUES AT BRAIDWOOD AND BYRON in its submittal of May 2,1997, the licensee indicated that 11 pipe segments in each unit will require the installation of spring loaded relief valves or check valves or modifications to containment isolation valves. Please provide a specific description of the design changes for each of these 11 pipe segments in each unit.
In its submittal of May 2,1997, the licensee indicated that overpressurization of one piping segment in each unit was intended to be mitigated by procedural changes and that overpressurization of two piping segments in each unit was intended to be mitigated by draining.
Please verify the specific method of mitigation to be implemented and describe the specific procedural changes involved.
j In the submittal of May 2,1997, the licensee indicated that two piping segments in each unit were being analyzed in detail to determine if there is an actual overpressure condition. Please verify if an overpressure condition exists and, if so, provide the method of mitigation of the overpressure if the licensee is crediting the structural adequacy of these segments to withstand the overpressure condition, the following information for these piping segments should be provided:
I Provide the applicable design criteria for the piping and the valves. Include the required load combinations.
Provide a drawing of the piping run between the isolation valves. Include the lengths and thicknesses of the piping segments and the type and thickness of the insulation.
Provide the maximumulculated temperature and pressure for the pipe run. Describe, in detail, the method used to calculate these pressure and temperature values. This should include a discussion of the heat transfer model used in the analysis and the basis for the heat transfer coefficients used in the analysis.
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ENCLOSURE