ML20212E717
| ML20212E717 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 09/22/1999 |
| From: | Skay D NRC (Affiliation Not Assigned) |
| To: | Kingsley O COMMONWEALTH EDISON CO. |
| References | |
| TAC-MA4704, TAC-MA4705, NUDOCS 9909270118 | |
| Download: ML20212E717 (4) | |
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September 22, 1999 Mr. Oliver D. King le, President Nuclear Generation Group Commonwealth Edison Company Executive Towers West til '
1400 Opus Place, Suite 500 Downers Grove, IL 60515
SUBJECT:
LASALLE COUNTY STATION, UNITS 1 AND 2 - REQUEST FOR ADDITIONAL INFORMATION (TAC NOS. MA4704 AND MA4705)
Dear Mr. Kingsley:
We have reviewed your letter of May 5,1999, in which you requested approval of a license amendment to use a different methodology and acceptance criteria for the reassessment of certain masonry walls subjected to transient high energy line break pressurization loads. We have determined that we need additional information to complete our review. The enclosed questions were discussed with your staff by telephone on September 2 and September 8,1999. We request that you provide a response within 1 month from the date of this letter to support the completion of our review prior to the restart of Unit 1 from its upcoming refueling outage..
Sincerely, Original Signed By Donna M. Skay, Project Manager, Section 2 Project Directorate ll1 Division of Licensing Project Management Office of Nuclear Reactor Regulation p((h Docket Nos. 50-373, 50-374 Distribution:
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Enclosure:
As stated Docket File PUBLIC
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DATE 09/ AsG9'9 09/n /99 09/ t/ /99 09/14/99 0d#E09 OFFICIAL RECORD COPY 9909270118 990922 PDR ADOCK 05000373 p
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O. Kingsley LaSalle County Station Commonwealth Edison Company Units 1 and 2 cc:
Phillip P. Steptoe, Esquire Robert Cushing, Chief, Public Utilities Division i
Sidley and Austin Illinois Attorney General's Office One First National Plaza 100 W. Randolph Street Chicago,lilinois 60603 Chicago, Illinois 60601
'3 Assistant Attorney General Document Control Desk-Licensing
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100 W. Randolph St. Suite 12 Commonwealth Edison Company Chicago, Illinois 60601 -
1400 Opus Place, Suite 400 Downers Grove, Illinois 60515 U.S. NRC-LaSalle Resident inspectors Office 2005 N. 21st Road Commonwealth Edison Company Marseilles, Illinois 61341-9756 Site Vice President - LaSalle 2601 N. 21st Road Chairman Marseilles, Illinois 61341-9757 LaSalle County Board of Supervisors LaSalle County Courthouse Mr. David Helwig Ottawa, alinois 61350 Senior Vice President Commonwealth Edison Company Attorney General Executive Towers West lli 500 S. Second Street 1400 Opus Place, Suite 900 Springfield, Illinois 62701 Downers Grove, Illinois 60515 Chairman Mr. Gene H. Stanley lilinois Commerce Commission PWR Vice President 527 E. Capitol Avenue, Leland Building Commonwealth Edison Company Springfield, Illinois 62706 Executive Towers West til 1400 Opus Place, Suite 900 l
lilinois Department of Nuclear Safety Downers Grove, Illinois 60515 Office of Nuclear Facility Safety 1035 Outer Park Drive Mr. Christopher Crane Springfield, Illinois 62704 BWR Vice President Commonwealth Edison Company Regional Administrator Executive Towers West 111 U.S. NRC, Region ill 1400 Opus Place, Suite 900 801 Warrenville Road Downers Grove, Illinois 60515 Lisle, Illinois 60532-4351 Commonwealth Edison Company LaSalle Station Manager 2601 N. 21st Road -
Marseilles, Illinois 61341-9757 s
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O. Kingsley LaSalle County Station Commonwealth Edison Company Units 1 and 2 i
I Mr. R. M. Krich Vice President - Regulatory Services Commonwealth Edison Company Executive Tcwers West 111 1400 Opus Place, Suite 500 Downers Grove, Illinois 60515 Commonwealth Edison Company Reg. Assurance Supervisor-LaSalle 2601 N. 21st Road Marseilles, Illinois 61341-9757 Ms. Pamela B. Stroebel i
Senior Vice President and General Counsel Commonwealth Edison Company P.O. Box 767 Chicago, Illinois 60690-0767 1
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i REQUEST FOR ADDITIONAL INFORMATION RELATED TO AMENDMENT REQUEST FOR LASALLE. UNITS 1 AND 2
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1.
During the September 8,1999, telephone conference, we understand that you made the following statements.
LaSalle performed dynamic response spectum analysis for the masonry walls a.
i subjected to the dynamic loads resulting from the differential pressures in the VR exhaust plenum masonry walls; b.
the loads imposed by the dynamic loads in item 1.s on the masonry walls were used without reduction in assessing the adequacy of the masonry walls; the loads imposed by the masonry walls on the steel columns were initially used c.
without reduction in assessing the adequacy of the steel columns;
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d.
the analysis results indicate that masonry walls were not cracked due to flexural stresses near the middle span, and that the computed flexural stresses in some of the steel columns were greater than the yield stress, but less than the ultimate yield 1
strength; and e.
the shear strength in the masonry block was adequate to transfer the load to the steel column.
Please indicate whether our understanding as stated above is correct. If not, make the appropriate corrections.
2.
We request the following information regarding the initial masonry wall analysis as stated in item 1, above:
the magnitude of the maximum flexural stress in a masonry wall, the maximum span a.
of that wall, and the particular load combination on page 9 of Attachment F in your May 5,1999, submittal which produced that stress:
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the size of the masonry block and the value of the section modulus of the block; the magnitude of the maximum flexural stress in a steel column, the size and length of c.
that column, and the tributary length of the wall that was supported by the column; d.
a sketch that details the typical connection between the masonry blocks and the steel column, including the horizontal truss reinforce hant; e.
the magnitude of the maximum shear force or stress in the masonry block at the connection and the shear strength assumed for the block; and f.
the value of the modulus of rupture for the masonry block of Clinton Station test data that was used for LaSalle.
3.
In Attachment G, Table 04.6, you tabulated mass and energy releases, which are used for the transient high energy line break pressunzation analysis. Please provide additional i
information that was used for the calculation of the forward steam, reverse steam, liquid, and reverse liquid values in the table. The information should include initial conditions, assumptions, break sizes, flow modals, basis for the flow stop times (such as isolation valve closure times), and the basis for the flow starting time when it is not zero.
ENCLOSURE