ML20084L739
| ML20084L739 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 09/22/1974 |
| From: | Stephenson B COMMONWEALTH EDISON CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| Shared Package | |
| ML20084L740 | List: |
| References | |
| 626-75, AO-740922, NUDOCS 8305230671 | |
| Download: ML20084L739 (1) | |
Text
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Common th Edison
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AOne First Nat
. Plaza. Chicago, ininois
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! Q ' Addr:,ss Reply to: Post Office Box 767 t
Chicago, Illinois 60690 l
BBS Ltr. #626-75 Dresden Nuclear' Power Station R. R. #1 I
Morris, Illinois 60450 gg- - s September 22, 1975
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Mr. James 0. Keppler, Regional Director
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p-Directorate of Regulatory Operations-Region III 17.:,
U. S. Nuclear Regulatory Cc:::nission 0d, 799 Roosevelt Road Glen Ellyn, Illinois 60137
SUBJECT:
SUPPIR&'iT TO REPORT OF AENOR"AL OCCURPR!CE PER SECTION 6.6.A 0F THE ME;ICAL SPECIFICATIC:!S EXCESSIVE LElJ.AG3 FAST REACTOR BUILDING TO TORUS VACUUM EREAKER 2-1601-31A Report Number 50-237/1974-31 In a letter to Mr. J. F. O' Leary, dated August 2,1974, concerning the subject occurrence, the corrective action described was to modify the valve to minimize binding in the valve disc to disc arm joint.
After further examination, evaluation and surveillance testing, it has been determined that the modification is unnecessary. The reactor building to-torus vacuum breaker valves are not identical to the torus to dryuell vacuum breakers and no significant corrosion was detected when the valve was disassembled and examined. On the basis of this c'xamination and other modifications to increase the closing force, the modification of the disc to disc arm connection has been reevaluated. Continued surveillance testing of these particular valves has shown no recurrence of improper seating of the valve. For the above reasons the modification to the disc to disc arm joint on valves 2-1601-31A & B is not necessary and will be canceled
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'B. B. Stephenson Superintendent BBS:JSA:smp File /hRC h
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