ML20028C084
| ML20028C084 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 12/27/1982 |
| From: | Stolz J Office of Nuclear Reactor Regulation |
| To: | Crouse R TOLEDO EDISON CO. |
| References | |
| NUDOCS 8301060023 | |
| Download: ML20028C084 (3) | |
Text
DISTRIBUTI0il:
DEisenhut.
DEC2 71982 Docket File RIngrain
!!RC PDR ADe Agazio.
L PDR OELD ACRS-10 H0rnstein ORB #4 Rdg AE0D EBlackwood Gray File IE-Harmon & Jordan Docket flo. 50-346
!!r. Richard P. Crouse Vice President, Nuclear Toledo Edison Company Edison Plaza - Stop 712 300 Madison Avenue Toledo, Ohio 43G52
Dear ifr. Crouse:
SUBJECT:
EVEllT OF JUtiE 24, 1981 - FOLLOLlUP On flovember 9,1982 a meeting between Toledo Edison Company and the flRC was held at the Davis-Besse facility. The purpose of the meeting was to detemine if certain areas of concern, which the fiRC staff identified in their review of the event of June 24, 1981, had been addressed by Toledo Edison Comany and to detemine if the liRC agrees with the adequacy of the actions taken. As a result of that meeting we find that clarification of several points is required.
1.
Toledo Edison Company letter dated July 8,1981 committed to providing automatic transfer to a redundant power source for the control room annunciator system. We understand that this comitment is fully iglenented. Toledo Edison Company also committed to a similar provision for the plant computer system which was to be implemented when the new plant computer was installed. We understand that the new computer was installed during the last refueling outage.
Toledo Edison Comany is requested to describe how the comitment for the plant computer systen has been _ implemented. Specifically, does the computer system renain functionally operable (CPU, I/O units, etc.)
from the control room in the event either power supply (YAU or YBU) is unavailable? If the commitment is _not yet fully implemented, 4
describe the extent to which the present system operability is inde-pendent of a single power source, the nature of your intended actions to conplete inplementation, your schedule for cogletion; and the compensatory reasures in force in the interim.
2.
It is our understanding that a large fraction of the non-nuclear instrumentation is powered from the fillI-X supply and the remainder from the liflI-Y supply. Therefore, if the fl!!I-Y supply fails a ninor plant transient would occur and that a plant trip night be avoidable.
s Accordingly, control room readout devices are switched to fillI-X powered transmitters to provide sufficient information to the reactor operator. Ilowever, if lifil-X supply fails,.the plant transient is more significant and a plant trip is unavoidable.
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9301060023 821227 PDR ADOCK 05000346 S
PDR sURN MEp OAtt )
NRC FORM 318 (10-80) NRCM 024a OFFIClAL RECORD COPY usam --m*o
o lir. Richard P. Crouse Toledo Edison Company is requested to describe the transient that occurs (in terms of RCS pressure, temperatures and flows, etc.) if fifil-X is lost.
Identify the cont;ml roon indicators recaining operable to pernit identification of the transient, track the course of the event.
Identify those plant systems necessary to mitigate the transient.
Identify any systems that are expected to be unavailable during the event. Provide your basis for acceptability of this event in lieu of plant nodifications or other conpensatory actions to lessen the effects of the disproportionate fillI loading on the flllI-X power supply.
Please provide your response not later than January 21, 1983.
The information requested in this letter affects fewer than ten respon-dents; therefore, OtB clearance is not required under P. L.96-511.
Sincere
%,. s p st John F. Stolz, Chief Operating Reactors Branch #4 Division of Licensing,
cc:
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Toledo Edison Company ccw/ enclosure (s):
Mr. Donald H. Hauser, Esq.
U.S. Nuclear Regulatory Connission The Cleveland Electric Residen't Inspector's Office Illuminating Company 5503 N. State Route 2 P. O. Box 5000 Oak Harbor Ohio 43449 Cleveland, Ohio 44101 Gerald Charnoff Esq.
Shaw, Pittman, Potts and Trowbridge 1800 M Street, N.W.
Washington, D. C.
20036 Paul M. Smart, Esq.
Fuller & Henry 30011adison Avenue P. O. Box 2088 Regional Radiation Representative Toledo, Ohio 43603 EPA Region V 230 South Dearborn Street Mr. Robert B. Borsum Chicago, Illinois 60604 Babcock & Wilcox
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Nuclear Power Generation Division 7910 Woodmont Avenue, Suite 220 Bethesda,11aryland 20814 Ohio Department of Health ATTN: Radiological Health Program Director P. O. Box 118 President, Board of County Columbus, Ohio 43216 Commissioners of Ottawa County Port Clinton, Ohio 43452 Attorney General Department of Attorney General 30 East Broad Street Columbus, Ohio 43215 Harold Kahn, Staff Scientist Power Siting Commission 361 East Broad Street l
Columbus, Ohio 43216 l
Mr. James G. Keppler, Regional Administrator l
U. S. Nuclear Regulatory Commission, Region III T
799 Roosevelt Road Glen Ellyn, Illinois 60137 l
Mr. Larry D. Young Manager, Nuclear Licensing Toledo Edison Company Edison Plaza 300 Madison Avenue
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Toledo, Ohio 43652
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