ML20085F515

AO Telecopy 75-2:on 750126,vol Control Tank Gas Lost to Auxiliary Bldg.Caused by Discharge of Orificed Recirculation Line from Vacuum Pump Back to Evaporator,Causing Erratic Evaporator Operation

ML20085F515
Person / Time
Site:	Palisades
Issue date:	01/28/1975
From:	Dewitt R CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20085F516	List: ML20085F515 ML20085F518
References
AO-75-2, NUDOCS 8308220164
Download: ML20085F515 (5)

Text

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• VEE 107( 1235) ( 1-014 019CO2 8) PD 01/28/75 1223 TLX CONSPOWER JKN ZCZC 002 DL Y JACKSON MICH 11 375 PMS ATOMIC ENERGY COMMISSION ATT f ,.y,,... c P a . 1:3 . ___mM -

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REG ION III ', , ,, 'g, .yyt _ //h.

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CONFIRMATION OF TELEPHONE CONVERSATION WITH K BAKER ON 1/26/75 AT 1600 q SUBJECT- ABh0RMAL OCCURRENCE 75-2 "

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FILE A075-2 REPORT NO. 75 - 2 REPORT DATE JAN UARY 2 7, 1975 0CCURRENCE DATE JANUARY 26, 19 75 FACILITY - PALISADES PLANT f

IDENTIFICATION OF OCCURRENCE -

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f ar.noi gLDES OF VOLUME CONTROL T ANK GAS TO THE AUXILIARY BUILDING.

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DESCRIPTION OF OCCURRENCE -

AT 0907 ON 1/26/75 A CONTROL OPERATOR STARTED VENTING THE VOLUME CONTROL TANK TO THE WASTE G AS SURGE TANK - WGST . THE AUXILIARY OPERATOR STATIONED AT THE GAS CONTROL PANEL C NOTED THAT THERE l WAS NO INCREASE IN THE WGST PRESSURE. AT THE SAME TIME THE AUXILIARY

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l OPERATOR STATIONED AT THE EVAPORATOR CONTROL PANEL OBSERVED A SEVERE l VACUUM UPSET. VENTING WAS STOPPED TO DETERMINE WHERE THE GAS WAS l G O ING .

, ANALYSIS OF OCCURRENCE - (

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I d.noi mIk WAS DETERMINED THAT BY CLOSING THE EVAPORATOR VACUUM PUMP DIS-

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CHARGE VALVE THE WGST W0tLD INCREASE PRESSURE. THE BACK PRESSURE CAUSED BY THE VCT VENT HAD BLOWN THE LOOP SZAL ON THE VACUUM PUMP AIR-WATER SEPARATOR TANK AND WAS VENTING TO THE AUXILIARY BUILDING.

THE ORIFICED RECIRC LINE FROM THE VACUUM PUMP DISCHARGED BACK TO THE EVAP IS WHAT CAUSED THE ERRATIC OPERATION IN THE EVAPORATOR.

THE AMOUNT OF GAS RELEASED FROM THE VCT TO THE AUXILIARY BUILDING WAS DETERMINED TO BE 2.7 E PLUS 06 CUBIC CENTIMETERS. THE TOTAL ACTIVITY RELEASED WAS 1.06 E-05 MILL ICUR IES.

CORRECTION ACT ION -

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PROCEDURES SHALL BE CHANGED TO VALVE THE EVAPORATOR VACUUM PUMP DIS- '

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E&E M Westem uman Telegram l vv OF THE VCT. DURING PERIODS OTHER THAN VENTING THE VCT THE EVAPORATOR VACUUM PUMP DISCHARGES SHALL BE ROUTED NORMALLY TO THE WGST.

R B DEWITT CONSUMERS POWER COMPANY CBW l

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