05000302/LER-1981-048-03, /03L-0:on 810718,emergency Feedwater Ultrasonic Flow Indicator FW-312-FI Was Discovered Exceeding Zero Check Low Limit.Caused by Instrument as-built Condition.Instrument Rezeroed.Ultrasonic Flow Transmitters to Be Replaced

/03L-0:on 810718,emergency Feedwater Ultrasonic Flow Indicator FW-312-FI Was Discovered Exceeding Zero Check Low Limit.Caused by Instrument as-built Condition.Instrument Rezeroed.Ultrasonic Flow Transmitters to Be Replaced

ML20010C461
Person / Time
Site:	Crystal River
Issue date:	08/12/1981
From:	Charles Brown FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20010C460	List: 05000302/LER-1981-048, Forwards LER 81-048/03L-0 05000302/LER-1981-048-03, /03L-0:on 810718,emergency Feedwater Ultrasonic Flow Indicator FW-312-FI Was Discovered Exceeding Zero Check Low Limit.Caused by Instrument as-built Condition.Instrument Rezeroed.Ultrasonic Flow Transmitters to Be Replaced
References
LER-81-048-03L, LER-81-48-3L, NUDOCS 8108200104
Download: ML20010C461 (2)

LER-1981-048, /03L-0:on 810718,emergency Feedwater Ultrasonic Flow Indicator FW-312-FI Was Discovered Exceeding Zero Check Low Limit.Caused by Instrument as-built Condition.Instrument Rezeroed.Ultrasonic Flow Transmitters to Be Replaced

Event date:
Report date:
3021981048R03 - NRC Website

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60 61 DOCK ET NUMBER 68 69 EVENT OATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h 10 l 2 l l At 0855 during normal operation,it was discovered that Emergency Feedwater Ultrasonic l l_O lsl I flow indicator FW-312-FI exceeded the zero check low limit. This created an event l

[ o l,3 l l contrary to T.S.3.7.1.2.

Maintenance was initiated,and operability was restored at i

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Redundancy was provided by FW-313-FI.

There was no effect upon the health l

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SUPPLHEITARY INFORMATION Report #50-302/81-048/03IM)

Facility:

Crystal River Unit 3 Report Date:

August 12, 1981 Occurrence Date:

July 18, 1981 Identification of Occurrence:

Faergency Feedwater Ultrasonic flowrate indicator was inoperable contrary to Technical Specification 3 7.1.2.

Conditions Prior to Occurrence:

Mode 1 - Power Operation (88%)

Description of Occurrence:

At 0855 during normal operation, it was discovered that Emergency Feedwater Ultrasonic Flow Indicator W-312-FI exceeded the zero check low limit.

Maintenance was initiated,and operability was restored at 0930.

Designation of Apparent Cause:

The cause of this event is attributed to inherent inability of the instrument to consistently indicate zero flow.

Analysis of Occurrence:

Redundancy was provided by ultrasonic flow indicator W-313-FI.

There was no effect upon the health or safety of the general public.

Corrective Action

The instrument was re-zerced and is checked shiftly.

The ultrasonic flow transmitters are scheduled to be replaced with conventional flow transmitters in conjunction with major emergency feedwater modification currently schedule for 1983 Failure Data:

This was the first occurrence of this type, and this is the tenth event reported under this specification.

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