ML20058J155
| ML20058J155 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 12/02/1993 |
| From: | Gody A Office of Nuclear Reactor Regulation |
| To: | Farrar D COMMONWEALTH EDISON CO. |
| References | |
| GL-92-09, GL-92-9, NUDOCS 9312130428 | |
| Download: ML20058J155 (3) | |
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December 2, 1993 Docket No. 50-373 DISTRIBUTION Docket File NRC & Local PDRs PDIII-2 r/f Mr. D. L. Farrar J. Roe J. Zwolinski Manager, Nuclear Regulatory Services J. Dyer A. Gody, Jr.
Commonwealth Edison Company C. Moore OGC Executive Towers West III, Suite 500 ACRS(10)
B. Clayton, RIII 1400 OPUS Place AEOD r/f E. Jordan Downers Grove, Illinois 60515 D. Ross D0A r/f IRB r/f K. Brochman
Dear Mr. Farrar:
J. Giitter T. McGinty B. Huffman A. Chaffee
SUBJECT:
INTERNATIONAL NUCLEAR EVENT SCALE EVENT REPORTING FORM The U.S. Nuclear Regulatory Commission (NRC) is reissuing the International Nuclear Event Scale (INES) Event Reporting Form that was disseminated regarding your recent declaration of an Alert at LaSalle County Station, Unit 1, on September 14, 1993. The original INES Event Reporting Form was in error.
We apologize if this has created any difficulties.
The NRC participates in the INES in a limited way, as was communicated to you through Generic Letter (GL) 92-09, issued on December 31, 1992. As stated in the GL, the INES rating is not intended to affect emergency classifications, event reporting to the NRC, or communications with the public.
Because usage of the INES could lead to confusion with the existing four-level emergency response scale used in the United States, the NRC delays the INES rating for at least one week after the event is terminated.
The NRC evaluates every event classified as an Alert or higher on the U.S. emergency response scale for its INES applicability. An INES Event Rating from is then prepared utilizing available documentation pertaining to the event.
Not every Alert (or higher) will necessarily receive an INES classification, as some may be rated "out of scale."
In this case, the event was classified as " Level 0, below scale." A copy of the rating form is enclosed.
I The NRC does not request a review or concurrence with the INES classification nor is any response requested.
If you have any questions, please contact me at (301) 504-1387.
Sincerely,
(%()O Ud Original signed by:
Anthony T. Gody, Jr., Project Manager Project Directorate III-2 kb
$$$73 Division of Reactor Projects III/IV/V p
PDR Office of Nuclear Reactor Regulation i
Enclosure:
Event Reporting Fcrm
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P Mr. D. L. farrar laSalle County Station Commonwealth Edison Company Unit Nos. I and 2 Cc:
Phillip P. Steptoe, Esquire Robert Cushing Sidley and Austin Chief, Public Utilities Division One first National Plaza Illinois Attorney General's Office Chicago, Illinois 60603 100 West Randolph Street Chicago, Illinois 60601 Assistant Attorney General 100 West Randolph Street Michael 1. Miller, Esquire Suite 12 Sidley and Austin Chicago, Illinois 60601 One first National Plaza Chicago, Illinois 60690 Resident Inspector /LaSalle, NPS U. S. Nuclear Regulatory Commission Rural Route No.1 LaSalle Station Manager P. O. Box 224 LaSalle County Station Marseilles, Illinois 61341 Rural Route 1 P. O. Box 220 Chairman Marseilles, Illinois 61341 LaSalle County Board of Supervisors LaSalle County Courthouse Ottawa. Illinois 61350 Attorney General 500 South 2nd Street Springfield, Illinois 62701 Chairman Illinois Commerce Commission Leland Building 527 East Capitol Avenue Springfield, Illinois 62706 Illinois Department of Nuclear Safety Office of Nuclear facility Safety 1035 Outer Park Drive Springfield, Illinois 62704 Regional Administrator, Region 111 U. S. Nuclear Regulatory Commission 799 Roosevelt Road, Bldg. #4 Glen Ellyn, Illinois 60137 Robert Neuman Office of Public Counsel State of Illinois Center 100 W. Randolph Suite 11-300 Chicago, Illinois 60601
' INTERNATIONAL NUCLEAR EVENTSCALE [lNES)
EVENT RATING FORM To be sent to-IAEA, Wogromerstrasse 5, P.O. Box 100, A-1400, Vienna, Austric TELEX: 1-12645, Cable: INATOM Vienna, Facsimile: 43-1-23D9723, Telephone: 43-1-2360-2685 EVEPH DATE EVEPH 11TLE LOSS OF OFF-SITE POWER AND REACTOR SCRAM 09/14/93 RATING W
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cesar nec FACILITY FAC!UTY 1036 m(e)
COUPERY NAME TYPE USA LASALLE 1 gwp ASPECTS OF SIGNIRCANCE TO THE PUBUC:
YES NO ACCIDENT 0 INCIDENT C
DEVIATION O RADIOACITVE RELEASES OFF-SITE O
E RADIOACTIVE RELEASES ON-SITE O
E WORKERS IfUURED BY RADIA110N O
O WORVERS INJURED PHYSICAL 1Y O
O PLAPR SAFETY IS UNDER CONTROL 0
0 THE EVENT REPORTED 15 A DISCOVERY OF A DEFICIENCY O
8 BY ROUTINE SURVEILLANCE A PRESS RELEASE WAS MADE (IF YES, PLEASE ATTACH IT)
O 9
A SHORT DESCRfPTION OF1HE EVEPR:
Unit 1 was operating at full power when a total loss of off-site power and reactor scram occurred due to the loss of a transformer.
The loss of the transformer was due to an electrical failure of its associated current transformer.
The i
event was cenplicated by the unanticipated loss of some non-safety related systems.
However, all three e.mergency diesel generators started and assumed loads as required, and all safety equipment operated as designed.
Off-site power, supplied through Unit 2, was restored to the emergency buses in about one hour.
The plant was stabilized and cooled down in an orderly manner.
NM Von F. Pro-k-an ccm.cr msem poe n eers: UMaC, Wasnington, ut rudon
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