ML20084K836

Telecopy Ro:On 740610,feedwater Low Flow Valve Failed.Caused by Not Maintaining Min Wall Thickness.Radiation Released Not Above Normal Level.Decontamination,Cleanup & Water Processing Initiated

ML20084K836
Person / Time
Site:	Quad Cities
Issue date:	06/10/1974
From:	Kalivianakis N COMMONWEALTH EDISON CO.
To:	Oleary J US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20084K663	List: ML20084K694 ML20084K759 ML20084K770 ML20084K810 ML20084K836 ML20084K840
References
NUDOCS 8305190555
Download: ML20084K836 (1)

Text

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50~265 0 f REFERENCE GUAD CITIES NUCLEAR P O'a E R STATION UNIT 2, DOCKET NUMBER @

50-2o5 LICENSE DPR-30, APPENDIX A, SECTION 1.0.8.3 AT 225AM ON JUNE 10, 1974 *ITH UNIT 2 OPERATING AT 200M*E, FEEDWATER LOW FL0a REGULATING VOLVES A0-2-bu3 SUFFERED A GROSS FAILURE '.)

0F THE VOLVES BODY, CAUSING TmE FEEDaATER LINE TO BECOME SEVERED.

TME SEVERED LINE CAUSED THE *ATER LEVEL IN THE REACTCR TO DECREASE L THE REACTOR SCRAMED FROM A L0a *ATER LEVEL SIGNAL. EXAMINATION O OF THE VOLVES SHO*ED THAT THE FAILURE APPEARED TO BE CAUSED BY THE VOLVES MINIU" aALL T"IC4 NESS BEING LESS THAN THE DESIGN

( REQUIREMENTS. MINIU" aALL THICKNESS SHOULD HAVE BEEN 5e2 INCHES:

ACTu1L uEASUREMENTS RANGED FRou 315 INCwES TO ,au7 INCwES, FEiUanitA k Lua imMUUun IFt dtVtMtU LINT aAd IbOLAltD aITHIN L 20 MINUTES. ESTIMATES ARE THAT APPR0xIMATEL 50,000 GALLONS OF WATER ESCAPED FROM TWE SEVERED LINE. HEAT FROM THE RELEASED aATER AND STEAM ACTUATED TrE FIRE DELUGE SYSTEM WHICH RELEASED I ADDITIONAL WATER TO T"E PLANT. RADIATION CONTAMINATICN SURVEYS 44 S*0aED THAT A SMALL GUANTITY OF CONTAMINATED a'ATER REACHED THE PLANT STORM SEaER SYSTEM AND EMPTIED INTO THE UNIT 2 OIL SEPARATOR

( SUPP. EXA"INATION OF *ATER IN THE SEPARATOR SHOAED GROSS BETA d,,

ACTIVITY OF 3.4 TI*ES 10 TO TwE PINUS 6 MICRO-CURIES PER PL.

AND GROSS GAMMA ACTIVITY OF 1.8 TIMES 10 TO THE MINUS 5 MICRO-CURIES PER ML. aHICH IS SLIGMTLY ABOVE BACKGRCUND. SAMPLES FROM THE W, INTAKE BAY COMPOSITE SAMPLER, *MICH IS DOWNSTEAM FROM THE SEPARATOR DISCHARGE TO TME RIVER, S*0aED ACTIVITY OF 1.07 TIMES 10 TO ,

int MINUS 8 MICHO-CURIES PER ML, aHICH IS NOT ABOVE NORMAL LEVELS, w THE MAJ04ITY OF THE aATER FROM THE LINE BREAK AND THE DELUGE SYSTEM ACCU"ULATED aITMIN THE PLANT. CLEAN UP AND DECONTAMINATION OF THE PLANT AREA, AND PROCESSING OF THE ACCUMULATED *ATER IS O IN PROGRESS.

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