ML19354E097

LER 89-038-00:on 891223,reactor Scrammed When Fire Occurred in Vicinity of High Pressure Turbine.Caused by Oil Soaked Inlagging Pads & Ignited When Turbine Casing Heated Up to Oil Flashpoint.Insulation Pads replaced.W/900122 Ltr

ML19354E097
Person / Time
Site:	Fermi
Issue date:	01/12/1990
From:	Anthony P, Orser W DETROIT EDISON CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
LER-89-038, LER-89-38, NUDOCS 9001250369
Download: ML19354E097 (4)

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!3 m3) 555* NRC-90-0009, a

U. S. Nuclear Regulatory Commission'  :

Attention:' Document Control Desk  !

Washington, D.C. 20555'

Reference:

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' NRC Docket No. 50-341. .

Facility Operating License No.: NPF

Subject:

' Licensee Event Report (LER)'No.- 89-038-00  :

Please find enclosed LER No. 89-038-00,. dated January 22,:

-1990, for a reportable event that occurred on December 23,~1989 A copy of,this LER is also being sent-to the '

H Regional Administrator, USNRC Region III. .

, If you have any questions, please contact Patricia 1 Anthony at (313) 586-1617  ;

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Sincerely ,

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Enclosure:

NRC Forms 366, 366A E

cc: A. B. Davis J. R. Eckert

-R. W. Defayette/W. L. Axelson-W. G. Rogers J; F..Stang t.

Wayne County Emergency Management: Division is

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. LICENSEE EVENT REPORT (LER) * *"' S 81 '"

F ACILITY NAME (t) DOCKET NUMSER (2) PAGI (3i Fermi 2 0 l 51010 l 0 l 31 41 1 1 loFl ]3 TITLE des Reactor Scrammed When Fire Occured in the Vicinity of the Main Turbine SVENT DAT8 451 LtR NUMetR tel REPORT DAf t (7) OTHER F ACILifit$ INVOLVED (0)

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$UPPLEMENTAL REPORT EXPECTIO (14) MONTH DAY YEAR SU8MisslON YES tir yes. complete EXPECTRO SUOMISSION CA Til NO l l l AseTr. ACT asmir R, wo c . s.., m . ww ar ,,. c.av -a s,.,Iom On December 23, 1989, smoke was discovered in the vicinity of the high pressure turbine. The fire brigade was dispatched, and reactor was manually scrammed. The brigade discovered the lagging insulation pads were burning and extinguished the fire.

Investigation has determined that the insulation pads were soaked with oil and the turbine casing had heated up to the oil's flash point. An l

oil spill had occurred several weeks earlier during a flush of the i turbine lube oil system during turbine reassembly. Apparently, the I spill was not adequately cleaned up.

The damaged insulation pads were replaced and an inspection for other damage performed. No other damage was noted. An accountability meeting was held between management and the personnel involved in the maintenance on the turbine. In order to prevent recurrence, Detroit Edison has developed an action plan which includes a reiteration of the importance of at,tention to detail.

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' LICENSEE EVENT REPORT (LER) TEXT C3NTINUATiON ' . Arencveo oMe No. 3iu-oio4 i L EXPtRit; 8/31/3 FACILITY 8eAME tu 00CetET NutetR lal ggR NUMean (4). Pact 131 YEAR ' 80 M- "qE [ggy,"

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TEXT -j Initial Plant Conditions: .

Operational Condition: 1 (Power Operation).

~ Reactor Power: 42 percent' Reactor Pressure: 940 psig .

Reactor Temperature: 520 degrees Fahrenheit  ;

Description of Occurrence:

On' December 23, 1989, at 0500 hours0.00579 days <br />0.139 hours <br />8.267196e-4 weeks <br />1.9025e-4 months <br />, smoke was discovered around the _ i high pressure. turbine'[(TA)(TRB)]. In: response to this condition,' the - .

fire brigade was. dispatched and a fire was reported at the south end ,

of the turbine at 0540 hours0.00625 days <br />0.15 hours <br />8.928571e-4 weeks <br />2.0547e-4 months <br />. The operator promptly manually, scrammed-t the reactor. The brigade extinguished the fire.by 0544 hours0.0063 days <br />0.151 hours <br />8.994709e-4 weeks <br />2.06992e-4 months <br />,-which was in .the vicinity of the lagging. ,

The scram signal was reset at 0547 hours0.00633 days <br />0.152 hours <br />9.044312e-4 weeks <br />2.081335e-4 months <br />. Isolation valve groups 13,.

14 and 15 isolated on low reactor-vessel water level (Level 3) at 0552 hours0.00639 days <br />0.153 hours <br />9.126984e-4 weeks <br />2.10036e-4 months <br />.

A reflash occurred at 0658 hours0.00762 days <br />0.183 hours <br />0.00109 weeks <br />2.50369e-4 months <br /> which was controlled-by the brigade ,

member stationed after thet fire.

. Investigation has determined that several of the' lagging insulation

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pads were soaked with oil.and that there were traces of oil around the' casing bolts and the casing's horizontal surfaces. ~ It has t been determined that the residual oil originated from an oil spill during the post-reassembly flush of the turbine: lube oil system'which had-t occurred several weeks earlier. At the time,' supervision ~ believed that the spill had been adequately cleaned up. '

Cause of Event: I This event was caused by oil. soaked lagging pads which' ignited'when-the oil's flash point was reached. This condition' existed due to inadequate inspection of the insulation pads and failure to adequately clean up spilled oil in the vicinity of the turbine following a-.

maintenance activity.

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" I LICENSEE EVENT REPORT (LER) TEXT CONTINUATION ~ smoveo oMe No asso-ois

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0l 0 l3 oF l.3 nxvwm - =, e wNnei .isic,,nn Analysis of Event:  !

The turbine generator system does not perform any safety function.

l The Reactor Protection System (JC) responded to the_ manual scram-l_ signal per its design. ;All of the engineered safety features which l

actuated responded correctly, allowing the plant to be secured in safe L

shutdown. Therefore, this event did not represent any danger to' the

_ health and safety of the public. ,

Prompt actions on the part of site personnel controlled- the fire and prevented it from posin6 a danger.

Corrective Actions: ,

The eleven damaged' insulation pads were replaced. . All traces of oil were removed using approved' cleaning agents. A visual inspection was performed to determine if there was other related damage.from the.

fire. No other damage was discovered.

An accountability meeting was held between management and the individuals involved in maintenance activity on>the turbine.

In order to prevent similar events from occurring, Detroit Edison has developed an action plan which is described in NRC-89-0300, dated December 26, 1989. This plan addresses personnel performance weaknesses discovered during the ficst refueling outage and during.the return to power operation. .

Previous Similar Events:

This is the only Licensee Event Report which has occurred due a fire caused by inadequate job site clean up and inspection. '

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8U.S. GPos 1998.$20 589/00070