ML17201Q439
| ML17201Q439 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 05/01/1989 |
| From: | Muller D Office of Nuclear Reactor Regulation |
| To: | Kovach T COMMONWEALTH EDISON CO. |
| Shared Package | |
| ML17201Q440 | List: |
| References | |
| TASK-03-01, TASK-RR TAC-65176, NUDOCS 8905030590 | |
| Download: ML17201Q439 (3) | |
Text
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 May 1, 1989 Docket No. 50-237 Mr. Thomas J. Kovach Nuclear Licensing Manager Commonwealth Edison Company Post Off ice Box 767 Chicago, IL 60690
Dear Mr. Kovach:
SUBJECT:
FRACTURE TOUGHNESS EVALUATION FOR DRESDEN UNIT 2, JPSAR TOPIC lII-1 (TAC NO. 65176)
The staff has completed its review of the information provided by the Commonwt:alth Ed1sCJn Company (CECo) in letters dated April 20, 1987 and January 6, 1989. These letters were provided to demonstrate that the materials in Dresd~11 2 have adequate fracture toughness.
In our enclosed Safety Evaluation, we havt: concluded that all components rt!viewed as part of SEP Topic III-1, except for the shell side of the LPCI heut exchangers, have adequate fracture toughness.
The materials on the shell side of the LPCI heat exchangers will have adequate toughness if their Lowest Service Temperature (LST) exceeds 77°F.
We therffore request that CECo determin~ whether the LST exceeds 77°F for shell side of the LPCI heat exchanger.
In addition, CECo should identify the operating c;crdit1ons when it does not, the LST during these oper*ating conditions, a.no the design changes necessary so that the LST exceeds 77°F.
- It is requested that this information be provided within 6 months of the date of tt.i s letter.
Ar~ questions regarding this request or schedult for responding should be directed to Byron Siegel, Project Manager, for Dresden Unit 2.
E11closure:
As stated cc: See next page
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Daniel R. Muller, Director Project Directorate III-2 Division of Reactor Projects III, IV, V, and Special Projects
Docket No. 50-237 Mr. Thomas J. Kovach Nuclear Licensing Manager Commonwealth Edison Comp.any Post Office Box 767 Chicago, IL 60690
Dear Mr. Kovach:
May 1, 1989
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SUBJECT:
FRACTURE TOUGHNESS EVALUATI_o~"~FOR DRES'oEN UNir,:2, IPSAJfTdPrt* *III-1 (TAC NO. 65176)
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The staff has completed its review of the inform~tion provide~ by the Commonwealth Edison Company (CECo) in letters dated.-April 20,'. 19~7-and January 6, 1989. These letters were. pro.vi~ed to demoris.tr~te that :the:
.:materials in Dresden. 2 have adequate fracture. toughness. ;'In our \\e'nc.losed Safety 'Eval:uation, we have concluded.- that all.. components. rev.iewed as. part of SEP Topic III-1, except for the sh,ell'.si9e of-* thE; *LPCI heat exchange.rs, have adequate fracture toug~ness. The foaterials on the sh'~ll' side.of the LPCI heat exchangers wi 11 have ade_quate toughness if,their Lowe.st Service Temperature (LST} exceeds 77°F.-
We therefore request that CECo d~tennine whether the LST exceeds 77_°F for shell side of the LPCI heat~exchanger. -.In addition, CECo should iden-tify the operating. conditions 'when it.doe~ "not, the LST during these operating conditions; and. the design changes necessary so that the LST
- exceeds 77°F. It is requested that this information b~ provided within 6
- months of the date of this letter..
-Any questions regarding. this request or. schedul~ for *responding should be dir~cted to Byron Siege-1, Project Manager, for Dresden Unit 2.
Encl os*ure:
-'.As* s*tated cc:* See next page DISTRIBUTION.
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- Daniel R.* Muller, Director**
- Project Directorate I I I-?
Diviston. of Reactor Proj~cts_III, IV, V, and Special Projects BE 11 iot CCheng p.r. fall PDIII-2:PD DMuller
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Mr. Thomas J. Kovach Commonwealth Edison Company cc:
Michael I. Miller, Esq.
Sidley and Austin One First National Plaza Ch1cago, Illinois 60603 Mr. J. Eenigenburg Plant Superintendent Dresden Nuclear Power Station Rural Route #1 Morris, Illinois 60450 U. S. Nuclt:ar Regulatory Co1t1111ssion Resident Inspectors Office Dresden Station Rural Route #1 Morris, Illinois 60450 Chairman Board of Supervisors of Grundy County Grundy County Courthouse Morris, Illinois 60450 Regional Administrator Nuclear Regulatory Commission, Region III 799 Roosevelt Road, Bldg. #4 Glen Ellyn, Illinois 60137 Mr. Michael E. Parker, Chief Division of Engineering 11 linoi s Departme11t of Nuclear Safety 1035 Outer Park Drive, 5th Floor Springfi~ld, Illinois 62704 Dresden Nuclear Power Station Units 2 and 3