PNO-III-88-002, on 880111,reactor Tripped & HPCI & RCIC Sys Triggered Automatically Due to Trip of One Reactor Feedwater Pump.Caused by Feedwater Control Sys Power Supply Failure. Power Supply Replaced

PNO-III-88-002:on 880111,reactor Tripped & HPCI & RCIC Sys Triggered Automatically Due to Trip of One Reactor Feedwater Pump.Caused by Feedwater Control Sys Power Supply Failure. Power Supply Replaced

ML20195H152
Person / Time
Site:	Fermi
Issue date:	01/11/1988
From:	Greenman E, Patricia Pelke NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
To:
References
PNO-III-88-002, PNO-III-88-2, NUDOCS 8801150243
Download: ML20195H152 (1)

PRELIMINARINOTIFICATIdNOfEVENTORUNUSUALOCCURRENCE--PNO-III-88-02DateJanuary 11, 1988 }

This $reliminary notification constitutes EARLY notice of events of POSSIBLE safety #A or public interest significance. The information is as initially received without verification or evaluation, and is basically all that is known by the Region III staff on this date.

Facility: Detroit Edison Company Licensee Emergency Classification:

Fermi 2 X Notification of an Unusual Event Newport, MI 48166 Alert Site Area Emergency Docket No. 50-341 General Emergency Not Applicable

Subject:

REACTCR SCRAM FOLLOWING FEE 0 WATER PUMP TRIP At 9:59 a.m. (EST) tne reactor tripped from 54 percent power following the trip of one of two reactor feedwater pumps. The second feedwater pump was in stardby; it was to be placed into service at about 60 percent power.

With the loss of all feedwater flow, the reactor water level began to decrease from the normal 197 inches above the top of the fuel. At 173 inches, an auto'natic reactor scram was initiated and, seconds later, when the water dropped to 111 inches, the High Pressure Coolant Injection (HPCI) and Reactor Core Isolation Cooling systems were triggered automatically. HPCI is an Emergency Core Cooling System (ECCS). The reactor water level recovered, and the systems were shut off. All safety systems functioned as designed with the exception of a post-accident data recorder which did not change to a higher recording speed.

The licensee declared an Unusual Event under its emergency plan at 10:12 a.m. The Unusual Event classification was terminated at 10:55 a.m. aiter the ECCS system was secured and the plant was detennined to be in a safe condition. '

The licensee's preliminary determination is that a power supply failed in the feedwater control system, causing the control valve on the feedwater pump turbine to close.

The power supply was replaced, and the unit was restarted at 5 a.m., on January 11. Power will be limited to about 50 percent because of a hydraulic pump failure on one feedwater pump, which was not related to the scram.

The resident inspectors have been monitoring the licensee's response to the reactor scram.

Region III (Chicago) is currently reviewing the licensee's request for authorizatica to go to full power from the current restricted level of 75 percent.

The State of Michigan will be notified. The Headquarters Duty Officer was notified of this event at 10:43 a.m. (EST), 1/10/88. This informati s of ') a.m., 1/11/88.

g. is /uJ.nen w CONTACT: P. e e (FTS 388-5560) E. Greenman (FTS 388-0518)

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PDR HQS. Operations Officer 3,,

Region V gy Region III 8801150243 880111 * *

• PDR IRE PNO-III-88-002 DCD