ML20059F922
| ML20059F922 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 10/28/1993 |
| From: | Kennedy J Office of Nuclear Reactor Regulation |
| To: | Farrar D COMMONWEALTH EDISON CO. |
| References | |
| GL-92-09, GL-92-9, NUDOCS 9311050167 | |
| Download: ML20059F922 (3) | |
Text
October 28, 1993 Docket No. 50-373 DISTRIBUTION:
Docket File 3
NRC & Local PDRs PDIII-2 r/f Mr. D. L. Farrar J. Roe J. Zwolinski Manager, Nuclear Regulatory Services J. Dyer J. Kennedy Commonwealth Edison Company C. Moore OGC Executive Towers West III, Suite 500 ACRS (10)
B. Clayton RIII 1400 OPUS Place AE00 r/f E. Jordan Downers Grove, Illinois 605I5 D. Ross DOA r/f IRB r/f K. Brockman
Dear Mr. Farrar:
J. Glitter T. McGinty B. Huffman
SUBJECT:
Ih fRNATIONAL NUCLEAR EVENT SCALE EVENT REPORTING FORM The U.S. Nuclear Regulatory Commission (NRC) is forwarding 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 event involved a total loss of off-site power and reactor scram from full power due tc the loss of a. transformer.
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 l
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 Form 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.
The NRC does not request a review or concurrence with the INES classification nor is any response requested.
If standard questions exist, please contact me at (301) 504-1333.
I Sincerely, Original signed by:
I Janet L. Kennedy, Project Manager Project Directorate III-2 Division of Reactor Projects Office of Nuclear Reactor Regulation e rting form Q{ % @hhh hk cc:
See next page OFC ( lA: PDIII-2 PM:PDIII-2 D:PDIII-2 NAME MOYRh JKENNEDYJK-JDYER 1
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. LaSalle County Station'~
..Mr. D. L.'Farrar-Unit Nos. I and 2 Commonwealth Edison Company 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 I. 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 Mr..G. Diederich
. Rural Route No.1 LaSalle Station Manager P. 0. Box 224 LaSalle County Station 1
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 l
Attorney General 500 South 2nd Street Springfield, Illinois 62701-Chairman Illinois Commerce Commission Leland Building
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.527 East Capitol Avenue Springfield, Illinois 62706 -
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Illinois Department of Nuclear Safety Office of Nuclear Facility Safety 1035 Outer Park Drive Springfield, Illinois 62704 i
Regional Administrator, Region III U. S. Nuclear Regulatory Commission 799 Roosevelt Road, Bldg. #4 Glen Ellyn, Illinois 60137 Robert Neuman Office of Public Counsel j
State of-Illinois Center 1
100 W. Randolph' Suite 11-300
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Chicago, Illinois 60601
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1
El4 CLOSURE 4NTERNATIONAL NUCLEAR EVENT SCALE [lNES)
EVENT RATING FORM To be sent to: lAEA, Wograrnerstrasse 5, P.O. Box 100, A-1400, Vienna, Austria TELEX: 1-12645, Cable: INATOM Vienna, Facsimlie: 43-1-2309723, Telephone: 43-1-2360-2685 WENT DAH EVENT TITLE LOSS OF OFF-SITE POWER AND REACTOR SCRAM 09/14/93 se"'g Q
, " "l RATING smw tesemmw or esem *cerm X
mmsom a m 'a uri cw rs mact rom Q 09/20/93 X
c w-sa m m er FACIUTY FACIUTY 1036 Me)
COUNTRY NAME TYPE USA LASALLE i BWR ASPECTS OF SIGNIFICANCE TO THE PUBUC:
YES NO ACCIDENT C INCIDENT O
DEVIATION O RADIOACTIVE RELEASES OFF-SITE O
RADIOAC11VE RELEASES ON-SITE O
6 WORKERS INJURED BY RADIATION O
E WORKERS INJURED PHYSICALLY O
O PLANT SAFETY IS UNDER CONTROL 0
9 THE EVENT REPORTED IS A DISCOVERY OF A DEFICIENCY O
8 BY ROUTINE SURVEILLANCE A PRESS RELEASE WAS MADE (IF YES, PLEASE ATTACH IT)
O A SHORT DESCRIPTION OF THE EVENT:
Unit I 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 event was complicated by the unanticipated loss of some non-safety related systems.
However, all three emergency 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.
KAME Ken E. Broccan ecommersammon;nesses ustat, warmnatm. LL zuS55 puant (301) 492-4193 sar (301) 492-7142 m ment - w - -- - on Jeannomou or war meer namesaae sencess secomanum r m
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