ML17191A734
| ML17191A734 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 06/16/1998 |
| From: | Grant G NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Kingsley O COMMONWEALTH EDISON CO. |
| Shared Package | |
| ML17191A735 | List: |
| References | |
| 50-237-98-17, 50-249-98-17, NUDOCS 9806230011 | |
| Download: ML17191A734 (2) | |
See also: IR 05000237/1998017
Text
June 16, 1998
Mr. Oliver D. Kingsley
President, Nuclear Generation Group
Commonwealth Edison Company
ATTN: Regulatory Services
Executive Towers West Ill
Downers Grove, IL 60515
SUBJECT:
DRESDEN INSPECTION REPORT 50-'237/98017(DRP); 50-249/98017(DRP)
Dear Mr. Kingsley:
On May 18 through 20, 1998, the NRC completed a special inspection at your Dresden Nuclear
Power Station. The enclosed report presents the results of this inspection.
On May 16, 1998, Dresden Unit 3 control room operators inserted a manual reactor scram due to
increasing condenser pressure (or decreasing vacuum). Dresden's Event Review Team
concluded that the single most likely cause was excessive.leakage past cross around relief
valve 3. The inspectors concluded the root cause effort was thorough and agreed with the
conclusions.
Two examples were identified where, preceding the manual reactor scram, the interface between
operations and engineering personnel was poor. First, the Dresden Event Review Team noted
that engineering and operations personnel did not fully evaluate the potential impact from the
leaking cross around relief valve 3. Second, the inspectors determined that a significant
distraction to control room operators existed during the reactor startup because engineering and
operations personnel were not fully communicating the cause of steam jet air ejector flow
oscillations and frequent steam jet air ejector drain level annunciators.
In accordance with 10 CFR 2. 790 of the NRC's "Rules of Practice," a copy of this letter and the
enclosure will be placed in the NRC Public Document Room.
Docket Nos.: 50-237; 50-249
Sincerely,
Original signed by
Geoffrey E. Grant, Director
Division of Reactor Projects
Enclosure:
Inspection Report 50-237/98017(DRP);
50-249/98017(DRP)
See Attached Distribution:
DOCUMENT NAME: G:\\DRES\\DRE98017.DRP
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cc w/encl:
M. Wallace, Senior Vice President
D. Helwig, Senior Vice President
G. Stanley, PWR Vice President
J. Perry, BWR Vice President
Distribution:
SAR (E-Mail)
D. Farrar, Regulatory
Services Manager
I. Johnson, Licensing Director
DCD - Licensing
M. Heffley, Site Vice President
P. Swafford, Station Manager
F. Spangenberg, Regulatory Assurance
Manager
Richard Hubbard
Nathan Schloss, Economist
Office of the Attorney General
State Liaison Officer
Chairman, Illinois Commerce
Commission
Project Mgr., NRR w/encl
C. Paperiello w/encl
J. Caldwell w/encl
B. Clayton w/encl
SRI Dresden w/encl
DRP w/encl
TSS w/encl
DRS (2) w/encl
Riii PRR w/encl
PUBLIC IE-01 w/encl
Docket File w/encl
GREENS
IEO (E-Mail)
DOCDESK (E-Mail)
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