PNO-V-88-001, on 880108,reactor Trip/Turbine Trip Occurred & Plant Shutdown for Greater than 48 H.Caused by Dirty Contact in Cable Connection to pre-amplifier.Containment Leakage Also Discovered.Manway Cover Bolts Torqued

PNO-V-88-001:on 880108,reactor Trip/Turbine Trip Occurred & Plant Shutdown for Greater than 48 H.Caused by Dirty Contact in Cable Connection to pre-amplifier.Containment Leakage Also Discovered.Manway Cover Bolts Torqued

ML20195H219
Person / Time
Site:	Trojan File:Portland General Electric icon.png
Issue date:	01/12/1988
From:	Mendonca M NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
To:
References
PNO-V-88-001, PNO-V-88-1, NUDOCS 8801190120
Download: ML20195H219 (1)

1

. PRELIMINARY NOTIFICATION OF EVENT OR UN'JSUAL OCCURRENCE--PN0-V-88-01 Dat@l/12/

This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public interest significance. The information presented is as initially received without verification or evaluation and is basically all that is known by Region V staff on this date.

FACILITY: PORTLAND GENERAL ELECTRIC COMPANY Emergency Classification TROJAN Notification of Unusual Event DOCKET NO. 50-344 Alert PRESCOTT, OREGON Site Area Emergency General Emergency J _,Not Applicable

SUBJECT:

SHUTDOWN FOR GREATER THAN 48 HOURS On January 8,1988, with the plant operating at 100% power, a reactor trip / turbine trip occurred at 3:03 pm (PST), on overpower delta temperature (OP Delta T). The coincidence of the performance of a channel functional test on protection set IV and a component failure in protection set I established the 2 out of 4 logic for OP Delta T reaci.or trip. Systems functioned as expected, including feedwater isolation and auxiliary feedwater system actuation, with the exception of the N32 source range channel which was energized but failed to indicate. The cause was determined to be a dirty contact in the cable connection to the pre-amplifier. While in Mode 3 af ter the reactor trip, indications of containment leakage led to discovery of leakage at the secondary manways on steam generators B and D (total of 4 manways). Following an engineering evaluation and concurrence from the NSSS vendor, the lcakage was stopped on the 'D' manways by increasing the torque on the bolts of the manway covers. The use of sealing compound is planned on the 'B' manways because the torquing was not fully effective. Plant restart is expected in early afternoon January 12, 1988, following completion of the Furmanite repair.

This information is current as of January 12, 1988, at 8:00 am.

CONTACT: M. Mendonca FTS 463-3720 DISTRIBUTION BY 5520: FAX T0:

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Chairman Zech EDO hl INP0 g.2.f Conn. Roberts AE00 RII NSAC /+ 15-Comm. Bernthal PA0 RIII LICENSEE /*

Comm. Carr SLITP RIV RESIDENT INSPECTOR a/Fo Comm. Rogers NRR HQS. OPERATIONS OFFICER /# V SECY NMSS CA ARM MAIL 70:

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OGC OIA DOT:(Trans. Only, Applicable State)

ACRS RES GPA RV FORM 211

, Revised: 8/19/87 8801190120 880112 h-V -001 DCD JE-h