ML20073E386
| ML20073E386 | |
| Person / Time | |
|---|---|
| Site: | Fort Calhoun  |
| Issue date: | 03/04/1983 |
| From: | William Jones OMAHA PUBLIC POWER DISTRICT |
| To: | Jay Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| REF-SSINS-6820 IEB-83-01, IEB-83-1, IEB-83-58, LIC-83-058, LIC-83-58, NUDOCS 8304150102 | |
| Download: ML20073E386 (2) | |
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'I Omaha Public Power District 1623 HARNEY e OMAHA. NEBRASMA 68102 e TELEPHONE 536 4000 AREA CODE 402 March 4, 1983 LIC-83-058 Mr.
J. T.
Collins, Administrator U.
S.
Nuclear Regulatory Commission Region IV j. gg gg 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76011 l
- Ihj
Reference:
Docket No. 50-285
Dear Mr. Collins:
Failure of Reactor Trip Breakers (Westinghouse DB-50) to Open on Automatic Trip Signal (IE Bulletin 83-01)
The subject bulletin describes an event at Salem Unit 1 in which Westinghouse DB type reactor trip breakers failed to trip open on receipt of an automatic trip signal from the reactor protection system (RPS).
The reactor trip was then initiated manually.
For those utilities not using the Westinghouse DB type breakers using the undervoltage trip attachment in their RPS, the bulletin requested a negative declaration.
The Omaha Public Power District does not use the Westinghouse DB type breakers in the automatic reactor trip system at the Fort Calhoun Station.
The Fort Calhoun Station RPS utilizes Allen Bradley contactors to interrupt AC power to the CEDM clutch power supplies upon receipt of a trip signal.
Westinghouse JA type molded case circuit breakers provide overcurrent protection to the circuit and manual trip by utilizing the undervoltage coil of the circuit breaker.
Accordingly, the District's evaluation indicates that the Fort Calhoun Station is not subject to the problems associated with the Westinghouse DB type breakers.
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W. C Divis/' Jones on Manager Prod ction Operations WCJ/TLP:jmm cc:
LeBoeuf, Lamb, Leiby & MacRae 1333 New Hampshire Avenue, N.W.
Washington, D.C.
20036 U.
S. Nuclear Regulatory Commission h
Document Control Desk Washington, D.C.
20555
t UNITED STATES OF AMERICA NUCLEAR REGULATORY COMMISSION In the Matter of
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)
OMAllA PUBLIC POWER DISTRICT
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Docke t No. 50-285 (Fort Calhoun Station,
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Unit No. 1)
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AFFIDAVIT being duly sworn, hereby deposes and says that he is Division Manager - Production Operations of Omaha Public Power District; that he is duly authorized to sign and file with the Nuclear Regulatory Commission the attached response to IE Bulletin 83-01; that he is familiar with the content thereof; and that the matters set forth therein are true and correct to the best of his knowledge, information and belief.
((
W.
C.
Divisi'gones pn Manager Production Operations STATE OF NEBRASKA)) ss COUNTY OF DOUGLAS)
Subscribed and sworn to before me, a Notary Public in and for the State of Nebraska on this 7tu day of March, 1983.
1J 2/La 7 Notary Public l
sussuasiner-a.ngen,e,
. J.T.GLEMON W h t m Jut a,N N
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