PNO-I-88-025, on 880304,turbine Control Valves Closed & Automatic Scram Occurred.Caused by Operator Bumping Against Span Protection Auxiliary Relay.Licensee Retaining Unit in Shutdown Condition to Perform Maint Work for 5-7 Days
| ML17156A429 | |
| Person / Time | |
|---|---|
| Site: | Susquehanna  |
| Issue date: | 03/07/1988 |
| From: | Blough R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | |
| References | |
| PNO-I-88-025, PNO-I-88-25, NUDOCS 8803150056 | |
| Download: ML17156A429 (2) | |
ACCELERATED DQQIBUTION DEMONS~ON REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)
ACCESSION NBR:8803150056 DOC.DATE: 88/03/07 NOTARIZED: NO DOCKET FACIL:50-387 Suscpxehanna Steam Electric Station, Unit 1, Pennsylva 05000387 AUTH.NAME AUTHOR AFFILIATION BLOUGH,R.
Region 1, Ofc of the Director RECIP.NAME RECIPIENT AFFILIATION
SUBJECT:
PNO-I-88-025:on 880304,main turbine tripped due to main generator load reject signal.
R DISTRIBUTION CODE:
IE34D COPIES RECEIVED:LTR l ENCL SIZE:
- TITLE: Preliminary Notification O-ccurrence/Non R-outine Event/Safeguarde Even NOTES:1cy NMSS/FCAF/PM.
LPDR 2cys Transcripts.
05000387 ~
RECIPIENT ID CODE/NAME COPIES RECIPIENT LTTR ENCL ID CODE/NAME COPIES LTTR ENCL INTERNAL: AEOD/DSP/TPAB NRR/DOEA/EAB11E NRR/DRIS/SIB9D4 OE LIEBERMAN,J RES BROOKS,B RES FILE RES/DE/EIB RES/DRAA RES/PMPDAS 1
1 1
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1 NRC OP CNTR 1
NRR/DRIS/SGB9A1 1
NR~RMAS/ILRB12 1
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02 1
0 DEPY 1
RES/DE 1
RES/DRA 1
RES/DRPS 1
RGN1 FILE 01 1
1 1
1 1
1 1
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1 1
1 1
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1 h,
EXTERNAL: DOE BARBER EV34 NRC PDR NOTES:
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8 TOTAL NUMBER OF COPIES REQUIRED:
LTTR 26 ENCL
DCS No:
5 304 Date:
March 7, 1988 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE"-PNO-I-88-25 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:
Pennsylvania Power 4 Light Co.
Susquehanna Unit 1 Docket No. 50-387 Berwick, Pennsylvania
\\
Subject:
UNPLANNED.SHUTDOWN OVER 48 HOURS; Licensee Emergency Classification:
Notification of Unusual Event Alert Site Area Emergency General Emergency X
Not Applicable At 12:07 p.m.
on 3/4/88 a Main Generator Load Reject signal caused the Main Turbine to trip.
The turbine control valves closed and an automatic reactor scram occurred.
Reactor vessel level decreased only slightly before being restored to normal levels by the reactor feedwater pumps.
Three safety relief valves lifted briefly as expected to mitigate the initial pressure spike.
No Emergency Core Cooling Systems actuated and the plant trip response was normal.
Investigation by the licensee determined that an operator working in the 230KV Switchyard bumped against the Span Protection Auxiliary Relay, causing it to actuate which generated a Main Turbine Trip Signal.
The licensee has decided to retain the unit in a shutdown condition for approximately 5 to 7 days to perform selected maintenance work.
The unit is expected to return to power operation during the weekend of March 12, 1988.
The Commonwealth of Pennsylvania was informed.
The licensee has issued a Press Release.
This Preliminary Notification is issued for information only and no further action by the NRC is anticipated.
The resident inspectors are following up on this event.
CONTACT:
R. Blough 346"5146 DISTRIBUTION:
H. St.
Chairman Zech Comm. Roberts Comm. Bernthal Comm. Carr Comm.
Rogers PA OGC OIA AEOD MNBB Phillips E/W EDO NRR Willste Mail:
ADM:DMB NMSS DOT:Trans only
. RES NRC Ops Crt ACRS SECY CA PDR Air Rights SP Regional Offices INPO NSAC TMI Resident Section RI Resident Office Licensee:
Region 1 Form 83 8803150056 880307 (Rev. August 1987)
PDR ICE PNO-I-88-025 DCD (Reactor Licensees