PNO-II-87-029, on 870516,unit Tripped on Low Reactor Coolant Flow Rate in Loop A.Caused by Partial Closure of Hot Loop Isolation Valve.Outage of 12 Days Planned to Correct Problem.Resident Inspector Will Provide Followup

PNO-II-87-029:on 870516,unit Tripped on Low Reactor Coolant Flow Rate in Loop A.Caused by Partial Closure of Hot Loop Isolation Valve.Outage of 12 Days Planned to Correct Problem.Resident Inspector Will Provide Followup

ML20214J543
Person / Time
Site:	Surry
Issue date:	05/18/1987
From:	Cantrell F, Croteau R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
To:
References
PNO-II-87-029, PNO-II-87-29, NUDOCS 8705280096
Download: ML20214J543 (1)

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May 18, 1987 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE PN0-II-87-29 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: Virginia Electric & Power Company Licensee Emergency Classification:

Surry Unit 1 Notification of Unusual Event Docket No: 50-280 Alert Surry, Virginia Site Area Emergency General Emergency X Not Applicable

SUBJECT:

SHUTDOWN EXCEEDING 48 HOURS This PN is being issued for information purposes only because the reactor is projected by the licensee to be shut down in excess of 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />.

At 8:24 a.m. (EDT) on May 16, 1987, Surry Unit 1 tripped on low reactor coolant flow rate in the "A" loop. The unit was at 100 percent power.

The licensee says the low flow condition appears to be due to partial closure of the hot loop isolation valve.

All systems functioned as designed during and following the trip.

A 12-day outage is planned to correct the problem.

The resident inspector will follow up.

The NRC received initial notification by telephone from the licensee to the headquarters duty officer at 8:50 a. m. on 'iay 16.

This information is current as of 1:00 p. m. (EDT) on May 18.

Contact:

R. Croteau 242-4668 F. Cantrell 242-5534 DISTRIBUTION:

H. Street MNBB Phillips E/W Willste Mail:

Chairman Zech ED0 NRR IE NMSS ADM:DMB Conn. Roberts PA OIA RES D0T: Trans Only Comm. Asselstine MPA AE0D Applicable State Comm. Bernthal ELD Comm. Carr Air Rights INP0~9'If SECY SP NSAC ACRS R Regions: Mhb Licensee: M .15 7

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(Reactor Licensees)

Applicable Resident Site - $ I3 l

52 96 870518 PNO-II-87-029 PDR