ML20235K049

Special Rept:On 870701,safety Injection Sys Water Inadvertently Added to RCS Cold Legs When Isolation Valve Opened W/Safety Injection Pump Running.Check Valves Successfully Retested

ML20235K049
Person / Time
Site:	Mcguire
Issue date:	09/28/1987
From:	Tucker H DUKE POWER CO.
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
NUDOCS 8710020215
Download: ML20235K049 (2)

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i i DUKE POWER GOMPANY P.O. nox 33180 citAlttarrE, N.O. 28242 IIAL IL TUCKER """ "

vwm ene.u.an (704) 070-4531 maun ruoovcirion September 28, 1987 U.S. Nuclear Regulatory Commission Document' Control Desk Washington, D.C. 20555

Subject:

McGuire Nuclear Station Docket No. 50-370 Special Report Pursuant To I Technical Specifications 3.5.3 and 6.9.2 I

Gentlemen:

Please find attached a special report concerning an inadvertent addition of Safety Injection system water into the Reactor Coolant system cold legs which occurred on July 1, 1987. .

l The nozzle's usage factors did not exceed 0.70 and the nozzle's cumulative usage factor did not exceed 0.70.

If there are any questions concerning this matter, please contact Duke Licensing.

4 Very truly yours, 2

Je%..

Hal B. Tucker SEL/128/j gc Attachment xc: Dr. J. Nelson Grace INPO Recorda Center Regional Administrator, Region II 1820 Water Place r

U.S. Nuclear Regulatory Commission Atlanta, Ga 30339 101 Marietta St., NW, Suite 2900 Atlanta, GA 30323 Mr. Darl Hood Mr. W.T. Orders U.S. Nuclear Regulatory Commission NRC Resident Inspector Office of Nuclear Reactor Regulation McGuire Nuclear Station Washington, D.C. 20555 8710020215 87 287 PDR ADOCK 05 370 S PDR e

i Duke Power Company McGuire Nuclear Station Special Report Safety Injection System Water Was Inadvertently Added To The Reactor Coolant System Cold Legs When An Isolation Valve Was Opened With A Safety Injection Pump Running i

On July 1, 1987, Unit 2 was in Mode 4, Hot Shutdown, and Operations personnel were awaiting the completion of testing required prior to entering Mode 3, Hot {

Standby. Operations personnel started Safety Injection (NI) Pump 2A on the I

nightshift to aid Performance personnel in reseating NI check valves which (

were found to be leaking by during the Reactor Coolant Pressure Isolation j Valve Leak Test, PT/2/A/4200/08B. Operations personnel left NI Pump 2A '

running in the recirculation mode between reseating efforts. Nightshift Operations personnel informed dayshif t Operations personnel of the pump status j during shift relief turnover.

1 I

At approximately 0815, Performance personnel informed dayshift Operations {

personnel that the NI check valve testing required prior to entering Mode 3 1 was completed and that the NI system could be realigned for standby readiness.

The Operator taking the information did not recall that the NI pump was running and at 0839, opened valve 2NI-118, NI A to Cold Legs, as directed in procedure OP/2/A/6200/06, NI System, for alignment of the system for standby readiness. The Operator immediately noticed flow on the NI Pump 2A discharge i flow gauge, indicating flow had been aligned to the Cold Legs. Twelve seconds {

af ter opening valve 2NI-118, he closed the valve to terminate the eve.at and j tripped NI Pump 2A. Performance personnel subsequently successfully retested check valves operated during the inadvertent injection of water to the Cold Legs.

A 100 gpm flowrate was estimated from NI pump curves for the 12 seconds that valve 2NI-118 was open with NI Pump 2A running. Prior to the incident, Reactor Coolant system pressure was 578 psia and temperature was 344*F. The temperature of the water injected to the Cold Legs was estimated to be 80*F, and NI Pump 2A discharge pressure was 1530 psig at the time of the incident.

The usage factor for the NI cold leg injection nozzles did not exceed 0.70 and the nozzle's cumulative usage factor did not exceed 0.70. There has been a total of 4 Safety Injections at McGuire involving the 1.5 inch boron injection nozzles. This incident involved the first safety injection involving the 10" boron injection nozzles.