ML20085F579

Telecopy AO AO-74-23:on 740906,three Primary Coolant Pump Mode of Operation Used W/O Having Min Thermal Margin/Low Pressure Trip Setpoint Raised to Tech Spec Limit.Caused by Failure of Procedure to Remind Operator to Change Setpoint

ML20085F579
Person / Time
Site:	Palisades
Issue date:	10/17/1974
From:	Flynn J, Slade G CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	Cook R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20085F577	List: ML20085F576 ML20085F579
References
AO-74-23, NUDOCS 8308230017
Download: ML20085F579 (6)

Text

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VEC 199 ( 15 50) ( l- 026953 C290) PD 10/17/74 154$bCUl'll',7: gg j s TLX CONSPOWER JKN

ZCZC 006 DLY JACKSON MICHIGAN 10-17-74 PMS US ATOMIC ENERGY COMMISSION

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, 1. REPORT NO. A0-74-23, DOCK 50-255 e 2. A. REPORT D ATE - 10/17/74 B. OCCURRENCE D ATE - 9/6/ 74 8308230017 741025 PDR ADOCK 05000255 FACILITY - PALISADES S

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4. IDENTIFICATION OF OCCURRENCE -

THE THREE PCP MODE OF OPER ATION WAS USED WITHOUT HAVING THE MINI-l MUM THERMAL MARGIN / LOW PRESSURE TRIP SETPOINT RAISED TO THE TECHNI-CAL SPECIF ICATIONS LIMIT.

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5. CONDITIONS PRIOR TO OCCURRENCE -

4 THE REACTOR WAS CRITICAL IN THE HOT STANDBY CONDITION.

1 6 .. DESCR IPT ION OF OCCURRENCE - j t

I j ON SEPTEMBER 6, 19 74 AT 1451 THE PCP OPERATING CONFIGURATION WAS l .,.,,,,-.,

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CHANGED FROM FOUR PUMP TO THREE PUMP WITHOUT RAISING THE MINIMUM

THERMAL MARG IN/ LOW PRESSURE TRIP SETPOINT TO ABOVE 1750 PSIA AS SPECIFIED IN THE TECHNICAL SPECIFICATIONS.

7. APPARENT CA USE -

AT THE TIME OF THE OCCURRENCE THE OPERATORS HAD NO OBVIOUS MECHAN-

), ISM TO REMIND THEM THAT THE THERMAL MARGIN / LOW PRESSURE TRIP SET-POINT SHOULD BE CHANGED. SOME SUCH MECHANISM SHOULD HAVE BEEN PROVIDED SO THAT, ESPECIALLY AT SUCH TIMES AS PLANT STARTUP, AN OBVIOUS REMINDER IS PRESENT TO PREVENT THIS OVERSIGHT FROM OCCURRING.

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. ANALYSIS OF OCCURRENCE -

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THE OPERATION OF THE PLANT IN THIS MODE - 3 PCP - WAS LIMITED TO THE HOT STANDBY CONDITION. SINCE THE THERMAL MARGIN / LOW PRESSURE 1 TRIP IS USED TO PREVENT DNB, NO SAFETY SIGNIFICANCE CAN BE AT-TRIBUTED TO THIS PARTICULAR INCIDENT AS THERE WAS NO POWER OPERA-TION IN THE THREE PUMP MODE.

9. CORRECT IVE ACT ION-CORRECTIVE ACTION RECOMMENDED BY THE PLANT REVIEW COMMITTEE FOLLOWS-1 A. PROVIDE A TAG NEAR THE FLOW TRIP POINT SELECTOR SWITCH l

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7 STATING THAT THERMAL MARG IN/ LOW PRESSURE TRIP SETPOINT MUST BE I l CMANGED PRIOR TO GOING TO THE THREE PCP OR TWO PCP MODE OF OPERA-sr-ife in5esi -

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INCORPORATE THE SAME B. INITI ATE A CHANGE TO PROCEDURE Bl .0 TO C AUT ION As ABOVE.

10. F AILURE D AT A -

NOT APPLICABLE G F, SL ADE / J P FL YN N PALISADES PLANT CONSilt1ERS POWER COMP ANY ALL H0 f..-. ,aus, l

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