05000320/LER-1986-001, :on 851220,no Remote Speed Control Existed on Emergency Diesel Generator DF-X-1B.Caused by Defective Solenoid in Replacement Governor.Governor & Solenoid Returned to Mfg for Analysis

:on 851220,no Remote Speed Control Existed on Emergency Diesel Generator DF-X-1B.Caused by Defective Solenoid in Replacement Governor.Governor & Solenoid Returned to Mfg for Analysis

ML20140A494
Person / Time
Site:	Crane
Issue date:	01/16/1986
From:	Dell C, Standerfer F GENERAL PUBLIC UTILITIES CORP.
To:	NRC OFFICE OF ADMINISTRATION (ADM)
References
0386A, 386A, 4410-86-L-0016, 4410-86-L-16, LER-86-001, LER-86-1, NUDOCS 8601230127
Download: ML20140A494 (3)

LER-1986-001, on 851220,no Remote Speed Control Existed on Emergency Diesel Generator DF-X-1B.Caused by Defective Solenoid in Replacement Governor.Governor & Solenoid Returned to Mfg for Analysis

Event date:
Report date:
Reporting criterion:	10 CFR 50.73(a)(2)(1)
3201986001R00 - NRC Website

text

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APPROVED oms 8eo attM104 LICENSEE EVENT REPORT (LER)

F ACILITY NAME til DOCKET NUMeER (2)

PAGE G Three Mile Island Unit 2 o [ slo go lol3l 2 0 s lorl 0l3 1

Inoperability of Emergency Diesel Generator DF-X-1B Dt.c to a Failed Governor and a Defective Soleroid EVGerT DATE ill LER seUM6ER tel 84EPORT DATE (7)

OTHER FACILITIES INVOLVED 18)

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NAME TELEP* SONE NUMBER ARE A CODE 9,4 8,

,8,2,4 4 7 l,7 Christopher J. Dell, TMI-2 Licensing Technical Analyst i

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At 2050 hours0.0237 days <br />0.569 hours <br />0.00339 weeks <br />7.80025e-4 months <br /> on December 13, 1985, the annual preventive maintenance for Eniergency Diesel Generator DF-X-1B commenced. On December 20, 1985, while performing the required demonstration of engine operability, it was determined that there was no remote speed control. Troubleshooting eventually identified the governor as being defective. A replacement governor was obtained and installed. Retesting indicated that the remote speed control problem was corrected, but there was no shutdown capability. Further troubleshooting l

discovered a defective solenoid in the replacement governor. A new solenoid was obtained and installed. Engine operability was successfully demonstrated and the engine was returned to service at 1709 hours0.0198 days <br />0.475 hours <br />0.00283 weeks <br />6.502745e-4 months <br /> on December 21, 1985 Thus, Emergency Diesel Generator DF-X-1B was out-of-service for more than seven (7) days, exceeding the timeclock of the Action Statement of Technical Specification 3.8.1.1.

The event is reportable pursuant to 10 CFR l

50.73(1)(2)(1)(B). The root cause of this event is not known at this time.

The governor and solenoid will be returned to the manufacturer for analysis.

A supplemental report will be submitted to report the results of the analysis.

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PLANT OPERATING CONDITIONS BEFORE THE EVENT

The TMI-2 facility was in a long-term cold shutdown state; the defueling evolution is in progress. The reactor decay heat was being removed via loss to ambient. Throughout this event there was no effect on the Reactor Coolant System or the core.

II.

ST4TUS OF STRUCTURES, COWONENTS, OR SYSTEMS THAT WERE INOPERABLE AT THE START OF THE EVENT AND THAT CONTRIBUTED TO THE EVENT At the time of the event, Emergency Diesel Generator DF-X-1B (IEEE Code - EK) was out-of-service due to the performance of the annual preventive maintenance.

III.

EVENT DESCRIPTION

At 2050 hours0.0237 days <br />0.569 hours <br />0.00339 weeks <br />7.80025e-4 months <br /> on December 13, 1985, the annual preventive maintenance of TMI-2 Emergency Diesel Generator, DF-X-18, commenced in accordance with TMI-2 Preventive Maintenance Procedure 4220-PMR-3860.01, 'niesel Generator Inspection." On December 20, 1985, while perfarming the required demonstration of engine operability at the completion of the preventive maintenance, it was determined that there was no remote speed control, i.e., the speed of the diesel generator could not be regulated by the Control Room. Troubleshooting eventually identified the governor (IEEE Code-65) as being defective. A replacement governor was obtained and installed. Retesting indicated that the remote speed control problem was corrected, but there was no shutdown capability. Further troubleshooting discovered a defective solenoid (IEEE Code-SOL) in the replacement governor. A new solenoid was obtained and installed. Engine operability was successfully demonstrated and the engine was returned to service at 1709 hours0.0198 days <br />0.475 hours <br />0.00283 weeks <br />6.502745e-4 months <br /> on December 21, 1985.

Due to the timing of the governor and solenoid failure, i.e., at the completion of,the annual preventive maintenance, Emergency Diesel Generator YI-X-1B could not be restored to service within the seven (7) day timeframe permissible under the Action Statement of Technical Specification 3.8.1.1.

The Action Statement was exceed by twenty (20) hours and nineteen (19) minutes. Therefore, this event is reportable parsuant to 10 CFR 50.73(a)(2)(1)(B).

s IV.

ROOT CAUSE OF THE EVENT Therootcauseoftheg'Sernorfailureandthesubsequent defective solenoid has not been determined. A supplemental report will be submitted wher this information becomes available.

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CORRECTIVE ACTIONS

Short Term - The failed governor and subsequent defective solenoid were replaced. Engine operability was successfully demonstrated and the diesel was returned to service at 1709 hours0.0198 days <br />0.475 hours <br />0.00283 weeks <br />6.502745e-4 months <br /> on December 21, 1985.

Long Term - Both the governor and the solenoid will be returned to the manufacturer for analysis. GPU Nuclear will interact with the manufacturer on this event to determine if additional corrective actions are necessary.

VI.

COWONENT FAILURE DATA Part Type Part Designator Manufacturer Governor D-8240-089 Woodward Solenoid 5407-049 Woodward VII.

AUTOMATIC OR MANUALLY INITIATED SAFETY SYSTEM RESPONSES N/A VIII.

ASSESSMENT OF THE SAFETY CONSEQUENCES AND IWLICATIONS OF THE EVENT During the period the Emergency Diesel Generator, De-X-18, was inoperable, Emergency Diesel Generator, DF-X-1A, was in service.

The operability of DF-X-1A was demonstrated by performing the surveillance requirements of Recovery Operations Plan Section 4.8.1.1.1 and 4.8.1.1.2.a.4 in accordance with the Technical Specification Testing Frequency Matrix of Table 3.8-1.

During the period DF-X-1B was inoperable, offsite AC power was available and DF-X-1A could have performed the same function as DF-X-18.

No events requiring use of the Emergency Diesel Generators occurred during this period; therefore, this event had no effect on the health and safety of the public.

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Post Office Box 480 Route 441 South Middletown, Pennsylvania 17057 0191 717 944 7621 TELEX 84 2386 Writer's Direct Dial Number:

(717) 948-8461 4410- 86-L-0016 Document ID 0386A January 16, 1986 US Nuclear Regulatory Commission Document Control Desk Washington, DC 20555

Dear Sir:

Three Mile Island Nuclear Station, Unit 2 (TMI-2)

Operating License No. DPR-73 Docket No. 50-320 Licensee Event Report 86-01 Attached is Licensee Event Report 86-01 concerning the inoperability of Emergency Diesel Generator DF-X-1B on December 20, 1985.

This event is considered reportable pursuant to Title 10 of the Code of Federal Regulations, Section 50.73(a)(2)(1)(B).

Sincerely,

/

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kuw F. R. Standerfer Vice President / Director, TMI-2 FRS/CJD/eml Attachments cc: Regional Administrator - Office of I & E, Dr. T. E. Murley Director - TMI-2 Cleanup Project Directorate, Dr. W. D. Travers M

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GPU Nuclear Corporation is a subsidiary of the General Public Utilities Corporation 1