ML20217E464
| ML20217E464 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 10/02/1997 |
| From: | Grobe J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Jamila Perry COMMONWEALTH EDISON CO. |
| Shared Package | |
| ML20217E468 | List: |
| References | |
| 50-237-97-16, NUDOCS 9710070038 | |
| Download: ML20217E464 (3) | |
See also: IR 05000237/1997016
Text
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October 2, 1997
Mr. J. S. Perry
Site Vice President
Dresden Nuclear Power Station
Commonwealth Edison Company
6500 North Dresden Road
Morris,IL 60450
SUBJECT:
NRC INSPECTION REPORT 50 237/97016(DRS)
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Dear Mr. Perry:
On August 1,1997, a specialinspection was completed at the Dresden Nuclear Station, Unit 2.
The purpose of the inspection was to assess information regarding the July 27,1997, reactor
vessellevel control problems and subsequent manual reactor trip. This report presents the
results of that inspection.
On July 28,1997, the Dresden Unit 2 control room operators were attempting to shift operating
reccior feedwater pumps. During the foodwater pump shift, the operator at the controls
erroneously determined that the feedwater control system (FWCS) was not functioning correctly
and took manual control of the FWCS. The operator's subsequent Inability to control the FWCS
caused the unit supervisor to direct a manual trip of the reactor. We concluded that the
operator's inadequate evaluation of the FWCS during the pump start was the root cause of the
transient. The material condition of the FWCS, operator training, and procedural weaknesses
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contributed to the transient. We determined that the event's immediate safety consequence
was minimal as no operational safety limits were approached or exceeded.
We understand that you are planning to meet with us to discuss " lessons learned" from this
operational occurrence and the subsequent investigation conducted by the Dresden Nuclear
Station prompt investigation team.
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9710070038 971002
ADOCK 05000237
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J. S. Perry
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October 2, 1997
in accordance with 10 CFR 2.790 of the NRC's * Rules of Practice," a copy of this letter, its
enclosure, and your response will be placed in the NRC 'ublic Document Room (PDR).
Sincerely,
origimi Signed Dy
John A. Grobe, Acting Director
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Division of Reactor Safety
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Docket No. 50 237
License No. DPR 19
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Enclosures:
1. Inspection Report g7016(DRS)
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2. Sequence of Events
cc w/encis:
R. J. Manning, Executive Vice President,
Generation
M. Wallace, Senior Vice President,
Corporate Services
E. Kraft, Vice President, BWR Operations
Liaison Officer, NOC-BOD
D. A. Sager, Vice President,
Generation Support
D. Farrar, Nuc, lear Regulatory -
Services Manager
1. Johnson, Licensing Operations Manager
Document Control Desk - Licensing -
T. Nauman, Station Manager, Unit 1
M. Heffley, Station Manager, Units 2 and 3
F. Spangenberg, Regulatory Assurance
Manager
Richard Hubbard
Nathan Schloss, Economist,
Office of the Attorney General
State Liaison Officer
Chairman, Illinois Commerce Commission
DOCUMENT NAME: G:DRS\\DRS97016.DRS
To receive a ce py of this document, Indicato in the box 'C's Copy w/o attach /end 'E's Co>y w/attacNond 'W = No copy
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J. S. Perry
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October 2, 1997
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Distribution:
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_ Docket File w/encle
SRI, Dresden w/encls
R. A. Capra, NRR w/encle
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PUBLiC%2 w/encls
C. Pederson, Rill w/encle
TSS w/encls
OC/LFDCB w/encls
LPM, NRR w/encls
CAA1 w/encls
DRP w/encls
A. B. Beach, Rlll w/encls
DOCDESK w/encls
DRS w/encls
J. L Caldwell, Rlli w/encls
Rlli PRR w/encle
Rlli Enf. Coordinator w/encIs
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