ML20084U147
| ML20084U147 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 05/08/1972 |
| From: | Worden W COMMONWEALTH EDISON CO. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| Shared Package | |
| ML20084U135 | List: |
| References | |
| NUDOCS 8306270072 | |
| Download: ML20084U147 (2) | |
Text
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f^ D G F:1 4 gg 352P EST MAY 8 72 DEB 623
<-icy SSE249 DE CCC094 (CH 129CC601094)PD UU JOL 0126P EDTOS/08/y v v) 2 2C2C 1 NL PD MORRIS ILL t1AY 4 415P CDT
) k MR BOUCE GRIER, DIRECTOR REGION 3 COMPLIANCE h
q US ATOMIC ENERGY COMM 799 ROOSEVELT RD GLEN ELLYN ILL 60137 uf 9
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m D P R 25 DRESDEN NUCLEAR POUER STATION UNIT 3:
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THIS WILL CONFIRM C0tNERS ATION AT 15:00 IIRS THIS DATE WITH H DANCE W '~ U I
b TOOPENbf;$h REGARDING F AILURE OF Tile ISOL ATION CONDENSOR V ALVE 3-1301-3
[k ELECTRICALLY FOLLOUING A REACTOR SCRAM. IMMEDIATELY FOLLOWING l
THE' SCRAM WHICH OCCURRED AT 0901 HRS A GROUP 1 ISOL ATION OCCURED 33[r BEC AUSE OF A IIIGH W ATER LEVEL CONDITION.
dd$ k AN AT'IEMPT WAS t1ADE TO PL ACE D{E ISOL ATION CONDENSOR IN SERVICE u -
BUT V ALVE 3-1301-3 WOULD NOT OPEN. AN OPERATOR HAD' TO GO TO DIE V ALVE g
i SF-1201 (R5-69)
/
B306270072 720603 PDR ADOCK 05000249 i
P pgg AND M ANUALLY CRAKE THE V ALVE OFF ITS SEAT. ONCE DIE V ALVE WAS OPEt:ED ITS BREAKER RE-SET AND IT FUNCTIONED PROPERLY.
WHILE THE OPERATOR WAS WORKING ON PL ACING THE ISTL ATION CONDENSOR IN SERVICE REACTOR PRESSURE INCREASED TO APPROXIMATELY 1100 PSIG AT THIS PRESSURE 3 A ELECTROMATIC V ALVE OPENS AUTOM ATIC ALLY.
WHEN TIIE ELECTROMATIC VALVE OPENED THE DRYWELL PRESSURE IMMEDI ATELY I NCRE ASED TO 2. 5 PSIG. AFTER PEAKING AT 2 5 PSIG ' DIE DRYWELL PRESSURE RETURNED TO NORMAL.
A COMPLETE DRYWELL INSPECTION WILL BE MADE WHEN ENTRY IS POSSIBLE
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TO DETERMINE TIIE C AUSE OF THE PRESSURIZ ATION AND TO DETERMINE IF ANY EQUIPMENT HAS BEEN DAMAGED AS A RESULT OF THIS PRESSURIZ ATION i
IN ADDITION A COMPLETE CHECK-0UT WILL BE MADE ON VALVE 3-1301-3
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C 85 20Fa51HE ISOL ATION CONDENSOR TO DETERMINE WHY IT F AILED TO O b