ML20151C215

AO 11-75:on 750520,during Calibr of Vacuum Interlock Switch PS/RE15B,setpoint Found Above Tech Specs Limits.Caused by Misapplication.Wide Range Switch Used W/Setpoint at Extreme Low End.Switch Restrictive Reset Characteristic Is Limiting

ML20151C215
Person / Time
Site:	Big Rock Point File:Consumers Energy icon.png
Issue date:	05/21/1975
From:	Sewell R CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20151C218	List: ML20151C215 ML20151C220 ML20151C225 ML20151C228 ML20151C230
References
AO-11-75, NUDOCS 8103110734
Download: ML20151C215 (2)

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i :s ij THIS REPORT IS SU3MITTED TO CONFIRM THE TELEPHot E REPORT TO D 1:ILEY j j OF YOUR OFFICE ON MAY 20, 1975.

i i V  : 1. REPORT l.'O - A0-11-75 DOCKET 155

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3. FACILITY - BIG ROCK POINT PLANT, CHARLEVOIX hd L.u Q'lg 4. IDEt:TIFICATION OF OCCURRE! CE - PRESSURE SWITCH DRITT ON CON-DENSER L0V' VACUUM. SCRAM.It1TERLOCK.':

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6. DESCRIPTION OF OCCURRENCE - DURIN3 ROUTIt:E CALIBRATIO!! 0F VACULG INTEHLOCK SVITCH PS/REISB, THE SETPOINT VAS FOUND TO BE 362 PSIG.

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fw 1 THf. TECHNICAL UPECV TMCATXON CIALL5 f@W LLC 55 TMW 3$$ I'SId - tNEF ij 6.1.3 /E/ FOOTN')TE

• TECHNICAL SPECIFICATIONS. THE C ITCH Ht.S BEEN hJ; READJUSTED TO OPERAiE AT 339 PSIG.

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@j,) i 7. DESIGNATION OF APPARENT CAUSE OF OCCURRENCE - PRESCL' rte SUITCH I DRIFT- BOTH It: CREASE A'ND DECREASE HAS BEE EXPERIENCED IN THE PAET p

-l VITH THESE SUITCHES. THE SASIC PROBLEM IS A MISAPPLICATICN IN THAT

$,-Nl! A VIDE RANGE SWITCH HAS BEEN USED WITH A SETPOINT AT THE E".TRE::F. LCU  !

d.> l END. ALSO, THE SYITCH CANNOT BE SET MUCH BELOV 353 PSIG BECAU3E OF

[G i THE RESTRICTIVE RESET CHARACTERISTIC OF THE VACUUM SCRAM S'JITCH l'HICH RESETS AT APPROXIMATELY 25" HG. THIS IS DIFFICULT TO ACHIEVE AT RE-ACTOR PRESSURE BELOV APPRO.XIMATELY 343 PSIG. l Cis l

dj, 8. ANALYSIS OF OCCURRENCE - THE OPERATING POINT OF 12 PSIG ADOVE THE u .:

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Gj! LIMIT OCCURRED ON ONE OF TVO SVITCHES IN THE PROTECTIVE SYSTEM CHAN-bf FEL AND THUS THE PROTECTIVF FUNCTION VAS OPERABLE. THE PROPOSED TECHNICAL SPECIFICATION OF MARCH 11, 1975 INDICATES OUR RECUEST TO r..

l45 RAISE THIS LIMIT TO SCC PSIG BASED ON SETTI!;GS THAT ARE ALLO ('ED IN (9

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ANOTHER SIMILAR BVR PLANT.

(# ! 9. CORRECTIVE ACTION - THE SWITCH VAS RESET TO OPERATE AT 339 PSIG

's; $ ON MA Y 20, 1975.

l 10. FAJLURE DATA - REFERENCE SIMILAR PROBLEM VITH PS/RE15B IN A0-7-73 i REPORTED IN CUR LETTER OF MAY 8, 1973 AND A0-12 'I3 REPORTED IN OUR 4 j. i c[3 LETTER OF NOVE.'lBER 13, 1973, COMPONENT MANUFACTURER, BARKSDALE fiODEL 2 l 31 T A32 SS.

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