ML19327B306

LER 89-008-00:on 890910,ATWS Mitigating Actuation Circuitry Automatically Bypassed at About 42% Reactor Power, Disenabling Sys.Caused by High Tech Spec Setpoint.Enable/ Disable Setpoint Reset to 30%.W/891019 Ltr

ML19327B306
Person / Time
Site:	Point Beach
Issue date:	10/19/1989
From:	Fay C WISCONSIN ELECTRIC POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
CON-NRC-89-130 LER-89-008, LER-89-8, VPNPD-89-550, NUDOCS 8910300134
Download: ML19327B306 (2)

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VPNPD-89-550 10 CFR 50.73  ;

NRC-89-130 l October 19, 1989  ;

tc l U. S. NUCLEAR REGULATORY COMMISSION -

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Document Control Desk Mail Station P1-137 Washington, D. C. 20555 Gentlemen:

DOCKET 50-266 LICENSE EVENT REPORT 89-008-00 s AMSAC NOT ENABLED AS REQUIRED '

BY TECHNICAL SPECIFICATIONS  !

POINT BEACH NUCLEAR PLANT, UNIT 1 j Enclosed is Licensee Event Report 89-008-00 for Point Beach  !

~ Nuclear Plant, Unit.1. This report is provided in accordance with i 10 CFR 50.73(a)(2)(1)(B), "Any operation or condition prohibited l by the plant's Technical Specifications."  ;

r This report describes an event in which the ATWS mitigating system '

actuation circuitry (AMSAC) was automatically bypassed at a power  !

level greater than t'ne 40% power level required by the Technical Specifications. A supplement to this report will be submitted at a  ;

later date.

If any further information is needed, please do not hesitate to  :

contact us. ,

t Very truly yours, ,

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1 C. W. F l Vice President  !

Nuclear Power  :

1 L Enclosure l Copies to NRC Regional Administrator, Region III >

NRC Resident Inspector ,

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~~') ,n t,,,. - e m cree si ,u,a u re, 7one, 112 013 81 9 awe e, ,6 . . ... .- ,, . .i On September 10, 1989, Point Beach Nuclear Plant Unit 1 was decreasing power from greater than 40% to less than 40%. At somewhat less than 40% power, the ATWS mitigating actuation circuitry (AMSAC) is designed l

to be bypassed automatically based upon first-stage turbine pressure.

Power as indicated by first-stage pressure at this power level during power decreases is less than reactor power. In fact, the AMSAC was cutomatical).y bypassed at about 42% reactor power. Technical Specificati ms require the AMSAC system to be enabled at greater than 40% reactol Dower. Power was reduced to 38% and held until the bistable cc.t .d be reset. The enable / disable bistable setpoint was reset to 300 to ensure the operation of the system at less than 40%

reactor power. A revision to the Technical Specifications will be oubmitted to the NRC to clarify that turbine power of greater than 40%

is the power level at which AMSAC is required.

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