ML110190647
| ML110190647 | |
| Person / Time | |
|---|---|
| Site: | Indian Point  |
| Issue date: | 11/07/2010 |
| From: | NRC Region 1 |
| To: | |
| References | |
| FOIA/PA-2011-0045, FOIA/PA-2011-0066 | |
| Download: ML110190647 (4) | |
Text
Failure Mechanism of 21 Main Transformer and Extent of Condition CR: IP2-2010-6801 CA: 15 Summary:
Outside of Scope
, *Atl 18:39 on 11/-7l/l10,"with !the plant at approximately :100% :power, afault o-6ccurred°n ona-2lTVMain 'Transformeriwhich-resultedjn, a Unit 2 autbmatic-trip,.,An
.Aler wasideclared, in acc rdance.With-EAL,8.2.:3;,,d ue to:the subsequent 21 Main Trarsfotmer explosion.
Outside of Scope L
The'transformer' experienceda rapid increase in pressure due to the-failure-of the.
'B'.phase high voltage bushing. Thisý sudden increase caused the tank to fail.
,Combustible gases, from arcing, built up in theitransformer aszthe insulating oil leaked. from-the tank~breach After several rmore6 minutes, enough oxygen
,combined.,with the hot gasescausing.a secondary.,explosion! See Attachment 3 forphotos' of damage to bushings and ruptured transformer tank.
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Outside of Scope (23 Pages)
Outside of Scope (42 Pages)