ML20059D021
| ML20059D021 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 10/25/1993 |
| From: | Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Wallace M COMMONWEALTH EDISON CO. |
| Shared Package | |
| ML20059D024 | List: |
| References | |
| NUDOCS 9311020104 | |
| Download: ML20059D021 (3) | |
See also: IR 05000373/1993026
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UNITED STATES
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NUCLEAR REOULATORY COMMISSION
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OCT 2 51993
Docket No. 50-373
Docket No. 50-374
Commonwealth Edison Company
ATTN: Mr. Michael J. Wallace
Vice President
Chief Nuclear Officer
Executive Towers West III
1400 Opus Place, Suite 500
Downers Grove, IL 60515
Dear Mr. Wallace:
SUBJECT:
NRC REGION III AUGMENTED INSPECTION TEAM (AIT) REVIEW 0F THE
SEPTEMBER 14, 1993, LASALLE COUNTY STATION, UNIT 1, LOSS OF STATION
AUXILIARY TRANSFORMER
The enclosed report refers to a special onsite review by a United States
Nuclear Regulatory Commission (NRC) Augmented Inspection Team (AIT) on
September 16 through September 21, 1993, relative to the September 14, 1993,
loss of the station auxiliary transformer, at the LaSalle County Station,
Unit 1, and the failures of equipment that occurred during the event. The AIT
was composed of Messrs. J. D. Wilcox, Jr., M. J. Miller, R. A. Winter,
J. H. Neisler, A. J. Kugler, and R. A. Spence of the Region III office, the
Office of Nuclear Reactor Regulation (NRR) and the Office ft.r Analysis and
Evaluation of Operational Data (AE0D). The report also rtfers to the followup
activities of your staff and to the discussion of our fi.di.;p with
Mr. W. P. Murphy and others of your staff at the conclusion of the inspection.
The enclosed copy of our AIT report identifies areas examined during the
inspection. Within these areas, the inspection consisted of a selective
examination of procedures and representative records, observations, and
interviews with personnel.
The AIT was formed to gather information on the event.
Specifically, the AIT
examined licensee response to the event; root causes of the Unit 1 station
auxiliary transformer trip, the reactor scram, and other equipment failures;
evaluated whether there was an electrical design vulnerability; and evaluated
the licensee's notification process and classification of the event.
The AIT concluded that while the event was a significant operational
occurrence, no radiation was released and it did not pose an immediate impact
on the health and safety of the public. Nonetheless, NRC is concerned that
inadequate maintenance resulted in several equipment failures that occurred
during the event and recovery. We note that inadequate maintenance has been a-
contributing factor to other events at LaSalle and we are concerned that your
corrective actions have not been effective.
In view of these events, we
consider it important for you to carefully assess the scope of your current
maintenance activities and practices.
9311020104 931025
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ADDCK 05000373
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Commonwealth Edison Company
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OCT 2 51993
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The initial notification and certain aspects of the communication between the
site and the NRC during the event was also identified as being a weakness.
Strengths identified by the AIT included operating crew and technical support
center (TSC) personnel actions to deal with the event, and support provided
them by other Commonwealth Edison organizations.
The AIT charter does not include examining whether NRC rules and regulations
were violated or recommending enforcement action; however, the results of this
inspection could be the subject of a subsequent inspection.
In accordance with 10 CFR 2.790 of the Commission's regulations, a copy of
this letter, the enclosed inspection report, and its enclosures will be placed
in the NRC Public Document Room.
We will gladly discuss any questions you have concerning this inspection.
Sincerely,
Jo
B. Martin
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Regional Administrato
Enclosures:
1.
Inspection Reports
No. 50-373/93026(DRS);
No. 50-374/93026(DRS)
'
2.
September 16, 1993
Confirmatory Action Letter
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3.
AIT Charter
4.
Sequence-of-Events
5.
Personnel Contacted
See Attached Distribution
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' Commonwealth Edison Company
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00T 2 51993 -
Distribution
cc.w/ enclosures:
L. O. DelGeorge, Vice President,
Nuclear Oversight and
Regulatory' Services
W. Murphy, Site Vice President
J. Schmeltz, Acting Station Manager
J. Lockwood, Regulatory Assurance
Supervisor
D. Farrar,' Nuclear Regulatory
Services Manager
OC/LFDCB
Resident Inspectors, LaSalle,
Clinton, Dresden, Quad Cities
Richard Hubbard
J. W. McCaffrey, Chief,
Public Utilities Division
Licensing Project Manager, NRR
Robert Newmann, Office of Public
Counsel, State of Illinois Center
State Liaison Officer
Chairman, Illinois Commerce Commission
Chairman Selin
Commissioner Rogers
Commissioner Remick
Commissioner de Planque
D. C. Trimble, Jr., OCM
D. A. Ward, ACRS
J. M.-Tay1or, ED0
B. McCabe, ED0
J. H. Sniezek, DEDR
H. L. Thompson, DEDS
T. E. Murley, NRR
J. G. Partlow, NRR
F. J. Miraglia, NRR
J. W. Roe, NRR
C. E. Rossi, NRR
J. A. Zwolinski, NRR
J. E. Dyer, NRR
A. E. Chaffee, NRR
J. L. Kennedy, NRR
W. M. Dean, NRR
B. A. Boger, NRR
E. V. Imbro, NRR
E. L. Jordan, AEOD
J. E. Rosenthal, AE0D
J. Lieberman, OE
J. R. Goldberg, 0GC
Regional . Administrators -
Regions I, II, IV and V
J. B. Martin, RIII
H. J. Miller, RIII
E. G. Greenman, RIII
W. L. Forney, RIII
W. L. Axelson, RIII
01000d
R. J. Strasma, RIII
J. D. Wilcox, NRR
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