PNO-II-85-081, on 850820,during Full Power,Reactor Tripped. Caused by Valving Procedure Error by Technician Replacing Reactor Coolant Loop Flow Transmitter.Source Range Channel Being Replaced.Restart Scheduled for 850824

PNO-II-85-081:on 850820,during Full Power,Reactor Tripped. Caused by Valving Procedure Error by Technician Replacing Reactor Coolant Loop Flow Transmitter.Source Range Channel Being Replaced.Restart Scheduled for 850824

ML20134M397
Person / Time
Site:	Summer
Issue date:	08/22/1985
From:	Cantrell F, Andrea Johnson NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
To:
References
PNO-II-85-081, PNO-II-85-81, NUDOCS 8509040108
Download: ML20134M397 (1)

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August 22, 1985 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE PN0-II-85-81 This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public interest significance. The information is as initially received without verifi-cation or evaluation, and is basically all that is known by the Region II staff on this date.

FACILITY: South Carolina Electric & Gas Company Licensee Emergency Classification:

Summer Nuclear Plant Notification of Unusual Event Docket No. 50-395 Alert Jenkinsville, South Carolina Site Area Emergency General Emergency X Not Applicable

SUBJECT:

UNSCHEDULED SHUTDOWN GREATER THAN 48 HOURS The Sumer plant, which has been shut down since a reactor trip on August 20, remains out of service for replacement of some intermediate and source range nuclear instrument detectors. Restart is expected on August 24.

The reactor trip on August 20 from 100 percent power was caused by a valving procedure error on the part of a technician who was replacing a flow transmitter on a reactor coolant loop. During the trip, one intermediate and one source range channel did not respond as l exp::cted. As a result, South Carolina Electric & Gas (SCE&G) determined that both channel d tectors should be replaced. The replacement is now under way while the unit is in cold shutdown.

SCE&G is prepared to respond to media inquiries.

The State of South Carolina has been informed.

SCE8G notified Region II (Atlanta) of this occurrence at 9 a.m. (EDT) today.

Contact:

A. Johnson, 242-4664 F. S. Cantrell, 242-5534 DISTRIBUTION:

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