05000250/LER-1980-003-03, /03L-0:on 800212,during Power Escalation Following Refueling,Reactor Power Indicated by Power Range Nuclear Instrumentation Was Low.Caused by Bypass Valve on Feedwater Transmitter 3B Not Fully Closed & Nis Improperly Adjuste

/03L-0:on 800212,during Power Escalation Following Refueling,Reactor Power Indicated by Power Range Nuclear Instrumentation Was Low.Caused by Bypass Valve on Feedwater Transmitter 3B Not Fully Closed & Nis Improperly Adjusted

ML17339A750
Person / Time
Site:	Turkey Point
Issue date:	03/13/1980
From:	Schopmann M FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML17339A749	List: 05000250/LER-1980-003, Forwards LER 80-003/03L-0 05000250/LER-1980-003-03, /03L-0:on 800212,during Power Escalation Following Refueling,Reactor Power Indicated by Power Range Nuclear Instrumentation Was Low.Caused by Bypass Valve on Feedwater Transmitter 3B Not Fully Closed & Nis Improperly Adjuste
References
LER-80-003-03L-01, LER-80-3-3L-1, NUDOCS 8003310305
Download: ML17339A750 (3)

LER-1980-003, /03L-0:on 800212,during Power Escalation Following Refueling,Reactor Power Indicated by Power Range Nuclear Instrumentation Was Low.Caused by Bypass Valve on Feedwater Transmitter 3B Not Fully Closed & Nis Improperly Adjusted

Event date:
Report date:
2501980003R03 - NRC Website

text

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~ol 2 indicated. by the Power Range Nuc 1ear Instrumentation (HIS ) was noted to be low.

A combination of oersonnel errors resulted. in t e actual

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Corrective action was initiated.

No safetv im ts were e ceeded.

Thi is reportable pursuant to TS 6.9.2.b.l.

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The root cause of the oroblem was

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The biomass valve on the 3B feedwater flow transmitter was not fullv closed w

h an erroneous flow signal to the plant computer.

Additionally, the NIS was found to be improperly adjusted..

Corrective action was taken to close the byoass and to properly adjust the NIS.

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LICENSEE EVENT REPORT PAGE TWO Additional Cause Description and Corrective Actions:

The bypass valve on the 3B feedwater flow transmitter was not fully closed resulting in an erroneous flow signal to the plant computer.

The valve was probably unseated accidentally when the transmitter was retubed during the refueling outage.

Additionally, miscalibration (low) of the RES and subsequent misad)ustment of the coarse gain on th'e power range drawers resulted in masking radial offsets which would have been detected by the plant compute'.

Corrective action will include. a periodic check of plant computer channels for calorimetric data with other plant instruments.

Additionally, the procedure detailing the startup sequence following refueling will be revised to require a manual calorimetric prior to reaching threshold power (93K).

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