PNO-III-87-093, on 870630,operators Manually Tripped Reactor Following Detection of Hydrogen in Isophase Bus Ducting. Caused by Failed Main Generator Bushing.Unit Expected to Remain in Hot Shut Down While Bushing Being Replaced

PNO-III-87-093:on 870630,operators Manually Tripped Reactor Following Detection of Hydrogen in Isophase Bus Ducting. Caused by Failed Main Generator Bushing.Unit Expected to Remain in Hot Shut Down While Bushing Being Replaced

ML20235F485
Person / Time
Site:	Perry
Issue date:	07/01/1987
From:	Forney W, Knop R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
To:
References
PNO-III-87-093, PNO-III-87-93, NUDOCS 8707130409
Download: ML20235F485 (1)

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GELIM! NARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-III-87-93 Date July 1, 1987 f4V\.

Or0 j

'his ' preliminary notification constitutes EARLY notice of events of POSSIBLE safety l

)r public interest significance. The information is as initially received without 'l 7 verification or evaluation, and is basically all that is known by the Region III l itaff on this date.

'acility: Cleveland Electric Illuminating Licensee Emergency Classification: ,

Company Notification of an Unusual Event l Perry 1 Alert j Perry, OH 44081 Site Area Emergency  :

Docket No. 50-440 General Emergency X Not Applicable i iubject: GENERATOR HYDR 0 GEN LEAK lt 10:34 a.m. (EDT), June 30, 1987, while operating at 40 percent power, operators manually

ripped the reactor following the detection of elevated concentrations of hydrogen in the

sopha

:e bus ducting (the electrical penetrations extending out from the generator.) All systems functioned as designed, j Lfailed main generator bushing was determined to be the cause of the hydrogen leak l hydrogen is used to cool the generator). The maximum hydrogen concentration detected was

?.8 percent. The flammable limit is 4 percent.

rhe' unit is expected to remain in hot shut down for more than 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> while the' bushing is l

=eplaced. Region III (Chicago) is monitoring the licensee's course of action.

rhe State of Ohio will be notified.

tegion III first learned of this event at 11:30 a.m. (EDT), June 30, 1987. This information ls current as of 11:30 p.m. (CDT), July 1, 1987, t l0NTACT:

R. Knop if $h W. Forney /

fe FTS 388-5547 FTS 388-5590 DISTRIBUTION:

Q. St. ED0 NRR E/W Willste Mail: ADM:DMB ,

lhairman Zech PA IE NMSS DOT:Trans only lomm. Roberts ELD OIA RES ,30 1 lomm. Asselstine AE0D NRC Ops Ctr /  ;

~

lomm. Bernthal 32 lomm. Carr SP / Regional Offices SCRS 3 NSAC/.ac, BECY INP0 /

A RIII Resident Office Licensee

(Corp. Office - Reactor Lic. Only)

-d SDR / 33 3 8707130409 870701 Of Region III h-I 093 PDR Rev. November 1986

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