ML20127C579
| ML20127C579 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 01/11/1993 |
| From: | Hopkins J Office of Nuclear Reactor Regulation |
| To: | Shelton D CENTERIOR ENERGY, TOLEDO EDISON CO. |
| References | |
| TAC-M84152, NUDOCS 9301140263 | |
| Download: ML20127C579 (2) | |
Text
,
5 January 11, 1993 Docket No. 50-346 DJSTRIBU1108 Docket File PKreutzer Mr. Donald C. Shelton, Vice President NRC & Local PDRs JHopkins Nuclear - Davis-Besse PD3-3 Reading OGC Centerior Service Company JRoe.
ACRS (10) c/o Toledo Edison Company JZwolinski JNorberg 300 Madison Avenue TKing CMcCracken Toledo, Ohio 43652 JHannon PD3-3 Gray Region Ill, DRP
Dear Mr. Shelton:
SUBJECT:
lilGH ENERGY LINE BREAK ANALYSES HODELING ERRORS (TAC NO. M84152)
On April 27, 1992, Toledo Edison Company (TE) internally documented that some calculations of temperature profiles following postulated high energy line breaks (llELB) contained modeling errors.
Specifically, the analyses associated with lines containing superheated steam outside containment used nonconservative techniques regarding heat transfer coefficients.
You submitted information to the NRC on this issue by letters dated May 8, June 18, and July 28, 1992.
As an interim measure, TE has taken credit for fire protection sprinklers to mitigate the effects of an HELB in Room 124 anri has established additional administrative controls to ensure the operability of the fire protection system.
For a long term solution, TE plans to replace some containment pressure transmitters with transmitters that are qualified for the new temperature profile and TE plans to remove and modify pipe supports as necessary to eliminate postulated critical cracks in selected areas.
TE plans to complete the long term actions by the end of the eighth refueling outage scheduled to commence March 1, 1993.
The NRC staff has reviewed your action plan and finds it to be acceptable.
The details of your analyses should be kept on-site as the NRC staff may audit.
them. Contact me if you have any questions.
Sincerely, OltIGINAI, SIGNED BY:
Jon B. Hopkins, Sr. Project Manager Project Directorate 111-3 Division of Reactor Projects - Ill/IV/V' Office of Nuclear Reactor Regulation cc:
See trext page-
[k 0FFICE PD3-3:tA PD3-3:PM $d BCHM$f/
BbSPL P
NAME PYNtzIr JBHopkins/jbh/baj J[oIberg CMcCracken JHannon DATE l/b/93
/ //,/93
/ / 7/93
/////93
/ ////93 Of fICIAlj RECORD q
DOCUMENT NAME:
G:\\DAVISBES\\DB84152.LTR g j,p '
P t 0 9301140263 930111 g-gm: meq5 P.
PDR ADOCK.05000346 gtp p r"% T~
~
~ ~ ~* A:7 J f'
P PDR usn:
\\
i Mr. Donald C. Shelton Davis-Besse Nuclear Power Station Toledo Edison Company Unit No. 1 l-cc:
Mary E. O'Reilly Centerior Energy Corporation Radiological Health Program 300 Madison Avenue Ohio Department of Health Toledo, Ohio 43652 Post Office Box 118 Columbus, Ohio 43266-0149 Mr. Robert W. Schrauder Attorney General Manager, Nuclear Licensing Department of-Attorney Toledo Edison Company General 300 Madison Avenue 30 East Broad Street Toledo, Ohio 43652 Columbus, Ohio 43215 Mr. James W. Harris, Director Gerald Charnoff, Esq.
Division of Power Generation Shaw, Pittman, Potts Ohio Department of Industrial Regulations and Trowbridge P. O. Box 825 2300 N Street, N.W.
Columbus, Ohio 43216 Washington, D.C.
20037 Regional Administrator, Region III Ohio Environmental Protection Agency U.S. Nuclear Regulatory Commission DERR--Compliance Unit 799 Roosevelt Road ATTN: Zack A. Clayton Glen Ellyn, Illinois 60137 P. O. Box 1049 Columbus, Ohio 43266-0149 Mr. Robert B. Borsum Babcock & Wilcox President, Board of Ottawa Nuclear Power Generation Division County Commissioners 1700 Rockville Pike, Suite 525 Port Clinton, Ohio 43452 Rockville, MD 20852 Resident Inspector State of Ohio U. S. Nuclear Regulatory Commission Public Utilities Commission 5503 N. State Route 2 180. East Broad Street Oak Harbor, Ohio 43449 Columbus, Ohio 43266-0573 Mr. Murray R. Edelman Mr. James R. Williams Executive Vice President -
State Liaison to the NRC Power Generation Adjutant General's Department Centerior Service Company Office of Emergency Management Agency 6200 Dak Tree Boulevard 2825 West Granville Road Independence, Ohio 44101 Columbus, Ohio 43235-2712
- - - - - -