PNO-I-86-073, on 860911,Unit 2 Tripped from 75% Power.Caused by Loss of Reactor Coolant Pumps 22 & 23 Due to Deenergization of Two Nonvital Buses.Unit Entered Cold Shutdown on 860913.Repair Completion Expected by 860920

PNO-I-86-073:on 860911,Unit 2 Tripped from 75% Power.Caused by Loss of Reactor Coolant Pumps 22 & 23 Due to Deenergization of Two Nonvital Buses.Unit Entered Cold Shutdown on 860913.Repair Completion Expected by 860920

ML20210G000
Person / Time
Site:	Salem
Issue date:	09/15/1986
From:	Norrholm L, Roxanne Summers NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
To:
References
PNO-I-86-073, PNO-I-86-73, NUDOCS 8609250318
Download: ML20210G000 (2)

DCS N3: 05311860011 1 fre - yy m 0 ate 15, 1986 m a.., . .t .

> nrn 3 ,..% g~,,;

PRELhbiARY NDTIFICATION OF EVENT.0R. -

. l *;] & .' ; J f f Q 4 in -

This preliminary notification constitutes' EARLY mobce ;o ; .P05518LE safety G' cr public interest significance. The information is"as left received without verification or evaluation, and is basically all that is known by the Region I staff on this date. 1 c..-

Facility: Licensee Energdkiits Ncation:

Public Service Electric & Gas Company X Notification of Unusual Event Salen Generating Station Unit 2 Alert Hancocks Bridge, New Jersey Site Area Emergency D/N 50-311 General Emergency Not Applicable Subjsct: STATION POWER TRANSFORMER (SpT) FAILURE - SHUTOOWN IN EXCESS OF 72 HOURS At 6:58 p.m. on September 11, 1986, Unit 2 tripped from 75% power. The reactor trip resulted from the loss of the Nos. 22 and 23 reactor coolant pumps because of the de-cnergization of the 2F and 2G 4160 volt non-vital busses. The busses were de-snergized as a result of an electrical failure which shorted both the No. 22 Station Power Transformer (one of two offsite power supplies) and one non-vital 230 volt transformer which steps voltage from 4160 volts (on the 2F bus) to 230 volts to supply smaller non-vital loads in the plant. In accordance with technical specifications, the unit entered cold shutdown at 10:10 a.m. on September 13. The plant will remain shut down until the No. 22 SPT is replaced. Repairs are expected to be completed by Saturday, September 20.

The resident inspectors will follow the licensee's actions to replace the No.22 SPT and will continue to follow up on the licensee's investigation into the cause of the alsctrical failure.

.This information is current as of 1:00 p.m. September 15, 1986.

The States of New Jersey and Delaware have been notified.

CONTACT: R. Summers L. Norrhola 488-1115 488-1114 DISTRIBUTION:

H. St. MNBB Phillips E/W W111ste Nail: AIW:DM8 Chairman Zech ED0 NRR IE NMSS DOT:Trcns only Comm. Bernthal PA OIA RES i Comm. Roberts ELD AE00

Comm. Asselstine Comm. Carr ACRS Air Rights N,'20 INPO p i SECY SP NSAC R Regional Offices TMI Resident Section '_ ?C) l RI Resident Office PM

?

Licensee:

8609250318 860715 PDR I&E R:gion I Form 83 PNO-I-86-073 PDR (Rav. July 1986) g

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0

DCS No: 05311860911 Dato: Ssptember 15, 1986 PRELIM NARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-I-86-73 This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public interest significance. The information is as initially received without verification or evaluation, and is basically all that is known by the Region I staff on this date.

Facility: Licensee Emergency Classification:

Public Service Electric & Gas Company X Notification of Unusual Event Salem Generating Station Unit 2 Alert Hancocks Bridge, Neit Jersey Site Area Emergency D/N 50-311 General Emergency Not Applicable Subj ct: STATION POWER TRANSFORMER (SPT) FAILURE - SHUTDOWN IN EXCESS OF 72 HOURS At 6:58 p.m. on September 11, 1986, Unit 2 tripped from 75% power. The reactor trip resulted from the loss of the Nos. 22 and 23 reactor coolant pumps-because of the de-energization of the 2F and 2G 4160 volt non-vital busses. The busses were de-energized as a result of an electrica'. failure which shorted both the No. 22 Station Power Transformer (one of two offsite power supplies) an~d one non-vital 230 volt transformer which steps voltage from 4160 volts (on the 2F bus) to 230 volts to supply smaller non-vital loads in the plant. In accordance with technical specifications, the unit entered cold shutdown at 10:10 a.m. on September 13. The plant will remain shut down until the No. 22 SPT is replaced. Repairs are expected to be completed by

- Saturday, September 20.

The resident inspectors will follow the licensee's actions to replace the No.22 SPT.

and will continue to follow up on the licensee's investigation into the cause of the electrical failure.

This information is current as of 1:00 p.m. September 15, 1986.

The States of New Jersey and Delaware have been notified.

CONTACT: R. Summers L. Norrholm 488-1115 488-1114 DISTRIBUTION:

H. St. _ MNBB Phillips E/W Willste Mail: ADM:DMB Chairman Zech EDO NRR IE NMSS DOT:Trans only Comm. Bernthal PA OIA RES Comm. Roberts ELD AE0D Comm. Asselstine Comm. Carr ACRS Air Rights. INPO----

SECY SP NSAC----

CA PDR Regional Offices TMI Resident Section 4

RI Resident Office Licensee:

(Reactor Licensees)

Region I Form 83 (Rev. July 1986)

DISTRIBUTION:

NRC0CA. LEAD 0P Please deliver H St addressees)

Chai rman' Zech Co5m Bernthal Comm Roberts Comm Asselstine

-Comm Carr ACRS SECY CA PDR NRCRM,EDO (Please make EDO internal distribution)'

NRCRM,0RDAZ (Please make PA0 internal distribution)

NRCELD,Leadop (Please deliver to G. Cunningham)

NRCWM,MaryR (Please make internal distribution)

NRCIE,Marylynn (To Mary Lynn Reardon)

NRCNRR, Krebs (Please make NRR internal distribution)

NRCRES, LEAD 0P (Please make internal distribution)

N'RCADMW,RichardG (Please.make internal distribution)

NRCIE,AE0D (Please deliver copy to OIA)

NRCRII,Leadop (Please make Internal RII distribution)

NRCRIII,Leadop (Please make Internal RIII distribution)

NRCRIV,Leadop (Please make Internal RIV distribution)

NRCRV,Leadop (Please make Internal RV distribution)

Region I WPS Resident Office (Site PC) (If secretary is off FAX)

RI Office Services Section (Mail to ADM:DMB & D0T (transportation only)

FAX to INP0 NSAC TMI 2 Program Office Stato Programs (Please deliver to Wayne Kerr)