ML20236V073
| ML20236V073 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 07/29/1998 |
| From: | Hansen A NRC (Affiliation Not Assigned) |
| To: | Jeffery Wood CENTERIOR ENERGY, TOLEDO EDISON CO. |
| References | |
| TAC-MA2181, NUDOCS 9807310286 | |
| Download: ML20236V073 (5) | |
Text
Mr. John K. Wood July 29,1998 l
Vice President - Nuclear, Davis-Besse Centerior Service Company c/o Toledo Edison Company Davis-Besse Nuclear Power Station 5501 North State Route 2 Oak Harbor, OH 43449-9760
SUBJECT:
INTERNATIONAL NUCLEAR EVENT SCALE EVENT REPORTING FORM -
DAVIS-BESSE NUCLEAR POWER STATION, UNIT NO. 1 (TAC N0. MA2181)
Dear Mr. Wood:
Enclosed is the International Nuclear Event Scale (INES) Event Reporting Form that was disseminated regarding your declaration of sn Alert on June 24, 1998.
The event involved a loss of offsite power, automatic reactor trip, and subsequent reactor cooldown on natural circulation.
The NRC participates in the INES in a limited way, as was communicated to you through Generic Letter 92-09, issued on December 31, 1992. As stated in the Generic Letter, 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 ti.e 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 l
be rated "out of scale".
In this case, the event was classified as level 1.
J The NRC does not request a review or concurrence with the INES classification nor is any response requested.
Please contact me if you have any questions regarding this matter.
Sincerely, ORIG. SIGNED BY Allen G. Hansen, Project Manager Project Directorate III-3 9807310286 980729
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Division of Reactor Projects III/IV
{DR ADOCK 050 36 Office of Nuclear Reactor Regulation Docket No. 50-346
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Enclosure:
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l July 29,1998 Mr. John K. Wood Vice President - Nuclear, Davis-Besse Centerior Service Company c/o Toledo Edison Company Davis-Besse Nuclear Power Station 5501 North State Route 2 Oak Harbor, OH 43449-9760
SUBJECT:
INTERNATIONAL NUCLEAR EVENT SCALE EVENT REPORTING F0D.M -
DAVIS-BESSE NUCLEAR POWER STATION, UNIT NO. 1 (TAC NO. MA2181)
Dear Mr. Wood:
Enclosed is the International Nuclear Event Scale (INES) Event Reporting Form that was disseminated regarding your declaration of an Alert on June 24, 1998.
The event involved a loss of offsite power, automatic reactor trip, and subsequent reactor cooldown on natural circulation.
The NRC participates in the INES in a limited way, as was communicated to you through Generic Letter 92-09, issued on December 31, 1992. As stated in the Generic Letter, 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 1.
The NRC does not request a review or concurrence with the INES classification nor is any response requested.
Please contact me if you have any questions regarding this matter.
Sincerely, Allen G. Hansen, Project Manager Prcject Directorate III-3 Division of Reactor Projects III/IV Office of Nuclear Reactor Regulation Docket No. 50-346
Enclosure:
As stated cc:
See attached list
John K. Wood Davis-Besse Nuclear Power Station, Unit 1 Toledo Edison Company cc:
l 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 l
Davis-Besse Nuclear Power Station Ohio Emergency. Management Agency L
5501 North State - Route 2 2855 West Dublia Granville Road Oak Harbor, OH 43449-9760 Columbus, OH 43235-2206 l
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 i
Washington, DC 20037 6606 Tussing Road P.O. Box 4009 l
Regional Administrator Reynoldsburg, OH 43068-9009 l
U.S. Nuclear Regulatory Commission i
801 Warrenville Road Ohio Environmental Protection Agency l
Lisle, IL 60523-4351 DERR--Compliance Unit ATTN: Zack A. Clayton Robert B. Borsum P.O. Box 1049 i
Babcock & Wilcox Columbus, OH 43266-0149 Nuclear Power Generation Division i
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 i
Oak Harbor, OH 43449 Department of Attorney t
30 East Broad Street James H. Lash, Plant Manager Columbus, OH 43216 Toledo Edison Company Davis-Besse Nuclear Power Station President, Board of County 5501 North State Route 2 Commissioner of Ottawa County Oak Harbor, OH 43449-9760 Port Clinton, OH 43252 L_-_--___-______-____-__-_____-_--_____-____________-_____-__-_________-__-__.
THE INTERNATIONAL NUCLEAR EVENT SCALE (INES)
EVENT RATING FORM (ERF)
To BE SEN* To THE lAEA INES COORDINATOR BY e FAK: + 4312000 29723 l
4AEA,WAORAMERSTRASSE 5. P.o. 902100. A-1400 VIENNA, AUSTRIA e 1JAEA.OR.AT i
l EVENT REACTOR TRIP AND NATURAL CIRCULATION EVENT DATE I
TITLE COOLDOWN DUE TO LOSS OF OFFSITE POWER 24.06.98 RATING "3"'
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FINAL E
oFF-SITE NdPACT l
COUNTRY USA FACILITY DAVIS-BESSE NUCLEAR POWER FACILITY PWR NAME STATION TYPE ASPECTS OF SIGNIFICANCE TO THE PUBLIC:
YES NO ACCIDENT O INCIDENT E DEVIATION O RADIOACTIVE RELEASES OFF-SITE O
E RADIOACTIVE RELEASES ON-SITE D
E WORKERS INJURED BY RADIATION O
E WORKERS INJURED PHYSICALLY O
E PLANT SAFETY IS UNDER CONTROL E
O THE EVENT REPORTED IS A DISCOVERY OF A DEFICIENCY BY ROUTINE SURVEILLANCE O
E A PRESS RELEASE WAS MADE E
O (IF YES, PLEASE ATTACH IT) l SHORT DESCRIPTION OF THE EVENT: On 24 June 1998, with the reactor operating at 99% of rated thermal power, the plant lost offsite power due to seveie weather, including lightning strikes to the electrical switchyard and a tornado that damaged the switchyard and turbine building roof. The reactor automatically shut down as a result of the loss of electrical power and emergency diesel generators (EDGs) provided power to safety equipment. The licensee declared an ALERTemergency classification as a result of the event. The reactor was cooled down at a reduced rate of approximately 5.6C (10*F) per hour due to the unavailability of reactor coolant pumps, which require offsite electrical l
power.
On 25 June 1998, with offsite electrical power still unavailable, the licensee conservatively declared one of the two EDGs inoperable with respect to the plant Technical Specifications after the air temperature in the EDG room slightly exceeded the maximum design temperature. Although the EDG was declared inoperable, it operated normally and continued to supply power to its associated safety equipment until offsite electrical power T/as restored. Due to the reduced reactor cooldown rate, the licensee was unable to comply with the requirements of the Technical Specifications, and reported the deviation to the USNRC. The air temperature in the room continued to fluctuate near the maximum design temperature throughout the event. One source of offsite electrical power was restored to the plant during the evening of 25 June 1998, and the emergency was terminated during the afternoon of 26 June 1998.
JUSTIFICATION OF THE RATING: 'Ihis event was initially rated as level 0/below scale in accordance with Table 11 of the INES Users Manual, e an event with a high initiator frequency and fuh safety function availability. The ratinF was escalated to level I due to the duration of the unavailability of offsite electrical power and the tomado damage to plant structures.
CONTACT NAME Richard J. Barrett PER!,')N ADDRESS USNRC, WesNngton. oC 2o555 FoR FURTHER PHONE (3o1) 415 7A82 INFoRMATioN FAX (3o1) 816-5151 PLEASE ATTACH ADDfTioNAL INFoRMATioN oN JUSTIFICATION oF THE EVENT RATINo ANo DIFFICULTIES ENCOUNTERED,IF NEEDED ENCLOSURE
i
- JUL-E7,98 10:49 FR0r1: NUCLEAR LICENSING 419-249-2302 TO:301 816 5151 PAGE:02 I
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1 DATE:
June 25.1998 l
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TIME:
.__12:10 a.m.
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DAVfS-RESSE DECLARES AN ALER*l.
Company Spokesperson
(
88 Oak Harbor Ohio -- An Alert was declared at the Davis-Gesse Noc! car Power Station at 9:18
)
p.m. due to a tornado on site. Plant per.sonnel reponed the siting of a funnd chnal om rhc Plant cooling tower. The tornado caused a loss of off-site power wluch icsuited b e +rumarie p'.mt shut down fhe reactor has been shut-down and is in a safe condinon. & Aleo n iN mi least.
o.
nrIbar Emergency Classifications, as defined by the Nuclear Regulann y G,monsina According to the NRC, an Alert is a minor problem This riaoticmion k ded wi when an l
cvent has occurred that could affect any pan of the phoi The pl.o6 veme. 'i y 9nems are still availab): and are functioning as designed. Plant personnel ac insveuing ihr Plant equipmem m i
determine the extent of damage which may have resulted fmin the toniado There is no danger to the public. Plant operators have notified federal, state and county officials.
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