PNO-II-89-060A, on 890825,reactor Manually Tripped from 97% Power Due to Pressurizer a Safety Valve Lifting.Licensee Plans to Go to Cold Shutdown & Replace Valve.Repairs Expected to Take 1 Wk

PNO-II-89-060A:on 890825,reactor Manually Tripped from 97% Power Due to Pressurizer a Safety Valve Lifting.Licensee Plans to Go to Cold Shutdown & Replace Valve.Repairs Expected to Take 1 Wk

ML20246N995
Person / Time
Site:	Summer
Issue date:	08/25/1989
From:	Verrelli D NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
To:
References
PNO-II-89-060A, PNO-II-89-60A, NUDOCS 8909110016
Download: ML20246N995 (1)

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. August-25, 1989

' PRELIMINARY NOTIFICATION OF' EVENT OR UNUSUAL OCCURRENCE PNO-II-89-60A (Thisf preliminary notification constitutes EARLY notice of events of POSSIBLE safety or

-public; interest significance. The. information is as initially received- without verifi-l cation-~or evaluation, _ and is basically all that is known by the Region 11 staff on this:

date.

FACILITY: South Carolina Electric.& Gas Co. Licensee Emergency Classification:

V. C. Summer. Notification of Unusual Event

' Docket No. 50-395 Alert Jenkinsville, SC Site Area Emergency.

General Emergency X Not Applicable

SUBJECT:

'V. C. SUMMER REACTOR TRIP - SHUTDOWN GREATER-THAN 48 HOURS LAt 10:04 a.m., on August 25, 1989, the reactor was manually tripped from 97 percent power due .to .the ' A' pressurizer. safety valve lifting.

. At- approximately 9:00 a.m.. .the pressurizer safety valve body temperature increased from its normal range .of 300 to 400*F. The operators requested, per procedures, that an

. engineering- evaluation be performed. Temperature increased to 450*F at approximately 9:45 a.m., and operators began a plant shutdown. At approximately 10:00 a.m., acoustic monitors indicated that the 'A' safety valve had lifted and reactor coolant pressure began to decrease. The reactor was then manually tripped before reaching the automatic trip

, pressure setpoint and safety injection pressure setpoint. This event is similar to that

.which occurred on May 30, 1989, when valve "C" inadvertently lifted. See PN0-II-89-40.

' The licensee plans. to go to cold shutdown and replace the safety valve. Repairs are expected to take approximately one week.

The. NRC received initial notification of this event. by telephone from the resident inspectors at 10:00 a.m. (EDT) on August 25, 1989.

This'information is current as of 1:00 p.m. on August 25, 1989.

CONTACT: D. Verrelli -' 242-5535 DISTRIBUTION:

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Chairman Cart ARM Region I DOT (Transporta, tion Only)

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PNO-II-sp-060A PDC