ML20037B192
| ML20037B192 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 08/03/1972 |
| From: | Skovholt D US ATOMIC ENERGY COMMISSION (AEC) |
| To: | Butterfield L COMMONWEALTH EDISON CO. |
| References | |
| NUDOCS 8009080583 | |
| Download: ML20037B192 (2) | |
Text
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AUG 3 1972 a ci.c t.. a 5s.i37, an d 5 3 2 4 >'~~~'
Co:monwealth Edison Company ATTs: lir. L. D. Butterfield, Jr.
Nuclear Licensing Administrator Post Office Box 767 Caicago, Illinois 60690 Gentlemen.
FLOODII;G OF CRITIC /l. EQUIP!:F1h'T As a result of a failure of an expansion bellows in the circulating water line at Quad-Cities Unit 1, you experienced flooding and resultant degradation of some of the engineered safety features. You have reported that interim corrective action has been taken and acre per-manent corrective measures are planned at Quad-Cities 1 and 2 to prevent recurrence, however, similar action has not been reported for your other facilities.
You are, therefore, requested to revies the Dresden station facilities to determine (1) whether failure of any equipment which does not meet the criteria of Class I scismic construction, particularly the cir-culating water system, could cause flooding sufficient to adversely af fect the performance of engineered safety systems and (2) whether f ailure of any equipment could cause flooding such that cc==cn mode failure of redundant safety related equipment would result.
The integrity of barriers to protect critical equipment from flood waters should be assumed only when the barrier nects the seismic requirenents for Class I structures.
If your review determines that engineered safety features could be so af fected, provide your plans and schedule for corrective cetion together with the justification for continued operation of Dresden station facilities pending completion of the corrective action.
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Co: monucalth Edison Company g 3g Le results of your review are requested within sixty days.
This information should be provided with.one signed original and thirty-nine additional copics.
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Sincerely, 1
i
. \\'O Donald J. Skovholt 7
1 Assistant Director for i
Operatir; Reactors Directorate of Licensing cc.
John W. Ro.te. Esquire Isham, Lincoln G Beale i
Counselors at Law Distribution One l'irst National Plaza WDooly, DR Cnicago, Illinois Gu670 R0 (3)
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