05000285/LER-1980-028-03, /03L-0:on 801105,while Diesel Generator DG-1 Was Started & Run to Operating Speed,Buzzer Which Tests for DG-1 ready-to-load within 10 Seconds Failed to Sound within Required Time Limit.Cause Unknown.Diesel Retested & Started

/03L-0:on 801105,while Diesel Generator DG-1 Was Started & Run to Operating Speed,Buzzer Which Tests for DG-1 ready-to-load within 10 Seconds Failed to Sound within Required Time Limit.Cause Unknown.Diesel Retested & Started

ML19345B889
Person / Time
Site:	Fort Calhoun
Issue date:	11/12/1980
From:	Mueller R OMAHA PUBLIC POWER DISTRICT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19345B890	List: 05000285/LER-1980-028, Forwards LER 80-028/03L-0 05000285/LER-1980-028-03, /03L-0:on 801105,while Diesel Generator DG-1 Was Started & Run to Operating Speed,Buzzer Which Tests for DG-1 ready-to-load within 10 Seconds Failed to Sound within Required Time Limit.Cause Unknown.Diesel Retested & Started
References
LER-80-028-03L, LER-80-28-3L, NUDOCS 8012020679
Download: ML19345B889 (4)

LER-1980-028, /03L-0:on 801105,while Diesel Generator DG-1 Was Started & Run to Operating Speed,Buzzer Which Tests for DG-1 ready-to-load within 10 Seconds Failed to Sound within Required Time Limit.Cause Unknown.Diesel Retested & Started

Event date:
Report date:
2851980028R03 - NRC Website

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13 ia ; I and run to coerating sceed. However, the buzzer which tests for DG-1 "readv-to-leadt within 10 secones failed to sound within the.orescribed time limit. Uoon subsecuenti ioiAi !

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LER No.80-028 Cmaha Public Pcwer District.

Fort Calhoun Station Unit No. -l Docket No. 05000285 4

l Attachment No. -l

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. Safety Analysis

- The Fort Calhoun Station Unit No. -1 is so designed that.no single failure, by itself, can' adversely affect the ability of.the plant to safely shutdown in the event of an accident.

During the time CG-1 failed to start (automatically), the 161kv and.345kv offsite power feeds were energi:ed and available.

In addition,'the redundant diesel generator DG-2 was verified to be cperating correctly and it was further verified

. that nc other engineered safeguards ccmponents associated with DG-1 were inoperable. As such, the consequences of an accident wculd have been more than adequately mitigated had the unlikely event of an accident L

occurred.

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LER No.80-028 Omaha Public Power District Fort Calhoun' Station Unit No.1 Occket No. 05000285 Attachment'No. 2

Corrective Action

M.0. #7757 was written to investigate reasons for diesel generator DG-1 failure to start upon the second actuation of the Channel "A"

full speed switch, as well as, the failure to get the buz:er, simulating tne diesel is ready-to-load, when the ready to load light came en during the first actuation of the Channel "A" full speed test switch. As a result-of this 'aintenance investigation, diesel emergency start circuitry was checked for loose wires, bad or faulty. relays, failed or stuck switch contacts, etc. However, the results proved negative in that no probable cause of the diesel failures mentioned above has been positively deter-mi ned. In addition, a diesel air compressor was fo"7d to be ocerating i

improperly,' but still maintaining adequate pressi. to accommodate diesel start.

l After all applicable items had been checked, and found to be in operating order, the diesel generator DG-1 was again tested for operation per the channel "A" full speed test switch. The diesel started and was

" ready-to-load" within the prescribed time limit.

Therefore, the failures of '.he diesel to start have been undeter-minable.

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LER No.20-028 Omaha Public Powar District Fort Calhoun Station Unit No. 1 Docket No. 05000235 Attachment No. 3 Failure Data This is the first failare of this type at Fort Calhoun Station Unit No. 1.

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