ML20236Q438
| ML20236Q438 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 07/15/1998 |
| From: | Ronald Bellamy NRC (Affiliation Not Assigned) |
| To: | Johnston C AFFILIATION NOT ASSIGNED |
| Shared Package | |
| ML20236Q440 | List: |
| References | |
| NUDOCS 9807200241 | |
| Download: ML20236Q438 (5) | |
Text
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UNITE 3 STATES
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NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. *aans -t
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July 15, 1998 Ms. Charlene Johnston 3417 Darlington Road Toledo, Ohio 43606
Dear Ms. Johnston:
I am responding to your June 29, 1998 letter regarding the loss of offsite power event which occurred on June 24, 1998, at the Davis-Besse Nuclear Power Station. Most of the information you requested is available at the local public document room for Davis-Besse (Docket Number 50-346), which is located at the University of Toledo, William Carlson Library, Government Documents Collection, 2801 West Bancroft Avenue, Toledo, OH 43606.
Please refer to the Updated Safety Analysis Report (USAR) and the Technical Specifications (TSs) for this docket.
Your letter asked specific questions with respect to the emergency diesel generators (EDGs) and the spent fuel pool (SFP) cooling. One EDG is adequate to provide the power necessary to safely shut down the plant and maintain it in a safe shutdown condition.
Each of the two EDGs has a continuous power output rating of 2600 kW and can operate for an extended period of time (over a week) based on diesel fuel oil reserves.
If neither EDG is available, the station blackout diesel generator can provide necessary power. When this source is also not available (that is, the plant has lost all AC power), the plant is experiencing a station blackout.
This is an analyzed condition at Davis-Besse which is described in detail in Section 15.2.9 of the USAR.
During the loss of offsite power event, the EDG room temperatures increased due to malfunctioning ventilation dampers.
This increase in temperature required Davis-Besse to declare EDG #1 inoperable according to the TSs.
However, both EDGs were capable of operating and were able to function during
/
the event, even with the increased temperatures.
The SFP reouirc-s electricity to maintain the flow of cooling water.
The time period that the pool can withstand a loss of cooling varies depending on several factors, including the quantity and age of fuel in the pool and the
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ambient environmental conditions.
The licensee monitored the SFP temperature
/i during the event, and a backup cooling system powered by an EDG was available l
if necessary.
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PDR ADOCK 05000346 d
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,4 C. Johnston Additional information regarding this event will be published in NRC i
Inspection Report 50-346/98-012, which will be placed in the local public document room.
I encourage you to use this document room as a resource.
Sincerely, l
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Ronald R. Bellamy, Acting Project Director Project Directorate III-3 Division of Reactor Projects III/IV j.
Office of Nuclear Reactor Regulation l.
Docket 50-346
Enclosure:
C. Johnston letter dated June 29, 1998 cc: See attached list l
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C. Johnston July 15, 1998 Additional information regarding this event will be published in NRC Inspection Report 50-346/98-012, which will be placed in the local public document room.
I encourage you to use this document room as a resource.
Sincerely, Original signed by:
Ronald R. Bellamy, Acting Project Director Project Directorate III-3 Division of Reactor Projects III/IV Office of Nuclear Reactor Regulation Docket 50-346
Enclosure:
C. Johnston letter dated June 29, 1998 cc:
See attached list Distribution w/encls:
Docket File Collins /Miraglia PUBLIC BBoger PD3-3 Reading BSheron EGA1 OGC GGrant, RIII RBellamy SCampbell, RIII TKozak, RIII JRoe NRR Mailroom #0980157 WTravers RZimmerman DOCUMENT NAME: G:\\DAVISBES\\980157. TIC
. Conow,.nc..,e..
To recmve a copy of tens clocument, anchcata in the box: 'C' = Copy without enclosures
- E' = Copy with ancioswes *N* e No copy OFFICE PD33-LAlQ PD33-PM C RIII l
PD33-RQh)
NAME EBarnhil 8 AliansenO TKozak
- RBell'amy DATE 7//f/98
-7//99B 7/14/98
- ) / lflI/98 0FFICIAL RECORD COPY l
I l
C. Johnston-
- July 15, 1998 Additional information regarding this event will be published in NRC l
Inspection Report 50-346/98-012, which will be placed in the local public l
document room.
I encourage:you to use this document room as a resource.
Sincerely, l
Original signed by:
Ronald R. Bellamy, Acting Project Director Project-Directorate III-3 Division of Reactor Projects III/IV Office of Nuclear Reactor Regulation Docket 50-346
Enclosure:
C. Johnston letter dated June 29, 1998 cc:
See attached list Distribution w/encls:
Docket File Collins /Miraglia PUBLIC' BBoger PD3-3 Reading BSheron
.EGAl' OGC GGrant, RIII RBellamy SCampbell, RIII TKozak, RIII
-JRoe NRR Mailroom #0980157 WTravers RZimmerman DOCUMENT NAME:
G:\\DAVISBES\\980157. TIC l
' Concurrence by E-mait To receive a copy of this documartt kukcate in the bon: "C" = Copy without enclosures
- E" = Copy with enclosures "N" = No copy 0FFICE PD33-LA lG,.
PD33-PM C RIII l
PD33-RQ4)
NAME-EBarnhi1FA AHanserid3 TKozak
- RBell'amy DATE 7//f/98
-7//09B 7/14/98 7 /lfi/98 0FFICIAL RECORD COPY I
e John K. Wood Davis-Besse Nuclear Power Station, Unit 1 Toledo Edison Company cc:
Mary E. O'Reilly Robert E. Owen, Chief FirstEnergy Bureau of Radiological Health Davis-Besse Nuclear Power Station Service 5501 North State - Route 2 Ohio Department of Health Oak Harbor, OH 43449-9760 P.O. Box 118 Columbus, OH 43266-0118 James L. Freels Manager-Regulatory Affairs Toledo Edison Company James R. Williams, Chief of Staff Davis-Besse Nuclear Power Station Ohio Emergency Management Abncy 5501 North State - Route 2 2855 West Dublin Granville Road Oak Harbor, OH 43449-9760 Columbus, OH 43235-2206 Jay E. Silberg, Esq.
Donna Owens, Director Shaw, Pittman, Potts Ohio Department of Commerce and Trowbridge Division of Industrial Compliance 2300 N Street, NW.
Bureau of Operations & Maintenance Washington, DC 20037 6606 Tussing Road P.O. Box 4009 Regional Administrator Reynoldsburg, OH 43068-9009 U.S. Nuclear Regulatory Commission 801 Warrenville Road Ohio Environmental Protection Agency Lisle, IL 60523-4351 DERR-Compliance Unit ATTN: Zack A. Clayton Robert B. Borsum P.O. Box 1049 Babcock & Wilcox Columbus, OH 43266-0149 Nuclear Power Generation Division 1700 Rockville Pike, Suite 525 State of Ohio Rockville, MD 20852 Public Utilities Commission 180 East Broad Street Resident inspector Columbus, OH 43266-0573 U.S. Nuclear Regulatory Commission 5503 North State Route 2 Attorney General Oak Harbor, OH 43449 Department of Attomey 30 East Broad Street James H. Lash, Plant Manager Columbus, OH 43216 Toledo Edison Company Davis-Besse Nuclear Power Station President, Board of County l
5501 North State Route 2 Commissioner of Ottawa County i
Oak Harbor, OH 43449-9760 Port Clinton, OH 43252 l
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