ML20084K836
| 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: |
| References | |
| NUDOCS 8305190555 | |
| Download: ML20084K836 (1) | |
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JOHN F OLEARY, DIRECTOR O
DIRECTOWATE OF LICENSING REGULATION US ATOMIC ENERGY COMMISSION WASHINGTON DC 20545 l(
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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
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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
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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
'ATER REACHED THE a
PLANT STORM SEaER SYSTEM AND EMPTIED INTO THE UNIT 2 OIL SEPARATOR
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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.
N.J.
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