05000249/LER-1981-014-03, /03L-0:on 810616,during Scram Air Sys Header Pressure Switch Calibr,Pressure Switches 3-302-99A & B Actuated W/Setpoint Lower than Required.Caused by Instrument Setpoint Drift.Switches Reset

/03L-0:on 810616,during Scram Air Sys Header Pressure Switch Calibr,Pressure Switches 3-302-99A & B Actuated W/Setpoint Lower than Required.Caused by Instrument Setpoint Drift.Switches Reset

ML20009D806
Person / Time
Site:	Dresden
Issue date:	07/09/1981
From:	Mancini B COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20009D795	List: 05000249/LER-1981-014, Forwards LER 81-014/03L-0 05000249/LER-1981-014-03, /03L-0:on 810616,during Scram Air Sys Header Pressure Switch Calibr,Pressure Switches 3-302-99A & B Actuated W/Setpoint Lower than Required.Caused by Instrument Setpoint Drift.Switches Reset
References
LER-81-014-03L-02, LER-81-14-3L-2, NUDOCS 8107240366
Download: ML20009D806 (2)

LER-1981-014, /03L-0:on 810616,during Scram Air Sys Header Pressure Switch Calibr,Pressure Switches 3-302-99A & B Actuated W/Setpoint Lower than Required.Caused by Instrument Setpoint Drift.Switches Reset

Event date:
Report date:
2491981014R03 - NRC Website

text

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8 40 81 DOCKET NUMSER 68 69 EVENT DATE 14 75 REPCRT DATE 80 EVENT DESCRIPTION AND PROSASLE CONSEQUENCES Io l2l l While performing Scram Air System He r Pressure Switch Calibration, found pressure g ; switch 3-302-99A actuated at 47 psig decreasing and pressure switch 3-302-993 actuated g o 14 ; l at 49 psig decreasing. Setpoint should be greater than 50+- 2 psig decreasing Minimal [

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DEVIATION REPORT DV R NO.

Commonwealth Edison STA UNIT YEAR NO.

8 3 33 PART 11 TI TLE OF CEVI ATION OCCU RRED 6/16/S1 1700 Unit 3 Scram Air System Header Pressure Switch Below Limits l

ggg 7, y g SYSTEM AFFECTED 300

PLANT CONDITIONS

TESilNG Control Rod Drive Run 2440.06 788.29 MODE PwRfMwT)

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YES NO DESCRIPilON OF EVENT While doing Scram Air System Header Presquie Switch Calibration, SOP 8-15-58, found PS-3-302-99A

_,to trio (contacts closeTat 47 osig decreasiing and PS 3-302-99B to trip (contacts close) at

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49 osig decreasing.

Setpoint should be greater than 50 _ 2 psig decreasing.

DESCRIPTIC,N OF CAUSE

-~0THER APPLICABLE I N FO RMAll 0N Prse:ure switches are reset to trip at 53 psig decreasing and reset at 54.5 psig increasing.

R:ptctability was verified.

EQUIPMENT YES DR NO.

WR NO.

FAILURE

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X REPORTABLE CCCURRENCE ACTION ITEM NO.

PROMPT ON-SI TE NOTI FICATION NUMBER R. M. Ragan 6/18/81 1300 Xu-81 -14/03L-0 TlTLE CATE TIME TITLE CATE TIME 24-HOUR NRC NOTIFICATION PRCMPT OFF-SITE NOTI FICATION

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