05000348/LER-1978-059-03, /03L-0 on 780830:during Rapid Load Reduction from 100% Power,Tavg Exceeded Tech Spec Limits.Caused by Attempt to Maintain Axial Flux Differential within Target Band. Control Rods Driven in

/03L-0 on 780830:during Rapid Load Reduction from 100% Power,Tavg Exceeded Tech Spec Limits.Caused by Attempt to Maintain Axial Flux Differential within Target Band. Control Rods Driven in

ML19241A949
Person / Time
Site:	Farley
Issue date:	09/26/1978
From:	ALABAMA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19241A943	List: 05000348/LER-1978-059-03, /03L-0 on 780830:during Rapid Load Reduction from 100% Power,Tavg Exceeded Tech Spec Limits.Caused by Attempt to Maintain Axial Flux Differential within Target Band. Control Rods Driven in 05000348/LER-1978-060-03, /03L-0 on 780827:diesel Generator 2c Would Not Respond to Governor Motor Switch or Voltage Regulator Switch.Caused by Instrument Noise & Failure of Motor Pot.Pot & Fuses Replaced ML19241A942
References
LER-78-059-03L, LER-78-59-3L, NUDOCS 7907110461
Download: ML19241A949 (1)

LER-1978-059, /03L-0 on 780830:during Rapid Load Reduction from 100% Power,Tavg Exceeded Tech Spec Limits.Caused by Attempt to Maintain Axial Flux Differential within Target Band. Control Rods Driven in

Event date:
Report date:
3481978059R03 - NRC Website

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] I During a rapid load reduction from 100T cover to take 1A W P nFF-lin, duo m an,na g l oscillations, the Tavg increased to 581.5F.

T/S 3.2.5 soecifies that reactor coolant g l system Tavg shall be less than or equal to 581.2F.

Boration had been initiated and il rods had been placed in manual to prevent exceeding the axial flux difference (AFD) g l target band ( > 900 while reducing pcuer.

When the hiah Tavn alarm was received the

'] l control rods were driven in to decrease Tavg.

Tavg exceeded T/S limit for approximat

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Health / Safety of general public 9 Were not allected.

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Control reds were drive-

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