ML20195J360

Special Rept:On 880323,Train a Safety Injection & Main Steam Sys Isolation Signals Received from Unknown Fault Inside Train a Solid State Protection Sys Logic Cabinet.Cause of Fault Could Not Be Isolated.Cabinet Returned to Svc

ML20195J360
Person / Time
Site:	McGuire
Issue date:	06/22/1988
From:	Tucker H DUKE POWER CO.
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
NUDOCS 8806290119
Download: ML20195J360 (2)

Text

'

DUKE POWER GOMPANY P.O. BOX 33180 CHARLOT"rE, N.C. 98949 HALB. TUCKER ruuirssowe vus reestaneirr (704) Om831 wornas reonuor.on June 22, 1988 U.S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D.C. 20555 Subj ect: McGuire Nuclear Station, Unit 1 Docket No. 50-369, Unit 1 Safety Injection Report Pursuant To Technical Specifications 3.5.3 and 6.9.2 Gentlemen:

Please find attached a special report concerning the safety injection which occurred on March 23, 1988, (reference Licensee Event Report 369/88-05). This report is required to be submitted within ninety days in the event the Emergency Core Cooling system is actuated and injects water into the Reactor Coolant system.

The cumulative nozzle usage factor did not exceed 0.70.

If there are any questions concerning this matter, please contact Steve LeRoy at (704) 373-6233.

Very truly yours,

[  ! 5, p Hal B. Tucker SEL/56/sbn Attachment xc: Dr. J. Nelson Grace INPO Records Center Regional Administrator, Region II Suite 1500 U.S. Nuclear Regulatory Commission 1100 circle 75 Parkway 101 Marietta St., NW, Suite 2900 Atlanta, GA 30339 Atlanta, GA 30323 Mr. Darl Hood Mr. W.T. Orders U.S. Nuclear Regulatory Comission NRC Resident Inspector Office of Nuclear Reactor Regulation McGuire Nuclear Station S Washington, D.C. 20555 f,7 i\

8806290119 880622 PDR ADOCK 05000369 g DCD -

[

l l

ATTACHMENT i Duke Power Company McGuire Nuclear Station, Unit One Safety Injection Report On March 23, 1988 at approximately 1051, a Unit 1 Train A Safety Injection (SI) signal and Main Steam system isolation signal were received from an unknown fault inside the Train A Solid State Prot 2ction System (SSPS) Logic Cabinet (reference Licensee Event Report 369/88-05). The SI caused a Main Feedwater (CF) system isolation which tripped CF Pumps 1A and 1B on high discharge pressure and led to a Unit 1 Turbine Trip / Reactor Trip. Operations (OPS) declared an Unusual Event.

At approximately 1100, the SI signal was reset with an actual total injection time of 8 minutes and 45 seconds. The injection fluid temperature was 85 degrees F. Reactor Coolant (NC) system conditions prior to the event were 558 degreer F at 2236 psig. NC system pressure was greater than or equal to 2079 psig for the duration of the transient.

OPS stabilized the unit within 30 minutes, and at 1145 on the same day, the Unusual Event was terminated. Instrumentation and Electrical personnel investigated and tested the Train A SSPS logic cabinet, but could not electrically or physically isolate the cause of the fault. The cabinet was determined to be operable, and Unit i returned to Power Operation on March 24, 1988 at 1109.

TV.is event was the sixth Unit 1 SI for the 1 1/2 inch cold leg SI nozzles. The usage factor for this injection did not exceed 0.017, and the total usage factor from all injections on Unit I has not exceeded 0.70.

l 4

_. -,