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TMI pressure vessel integrity.

  1. Apr 18, 2008 #1

    vanesch

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    I would like to check something. If I understand well, in the TMI accident, the reactor vessel was never damaged (in the sense of: having lost major containment function) ? Can someone confirm this, or correct my understanding ?
     
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  3. Apr 18, 2008 #2

    Astronuc

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    AFAIK, the reactor pressure vessel was not perforated, but the liner and part of the carbon steel shell was damaged (partially melted or chemically reacted) from the core material that melted/interacted with the baffle and core support plate. I've seen pictures from the inside and it's a mess.
     
  4. Apr 21, 2008 #3

    vanesch

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    Ah, was at some point the vessel completely emptied from water ? I thought it was just the upper part of the fuel elements that was out of the water and melted ?
     
  5. Apr 21, 2008 #4

    Astronuc

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    Certainly the upper half of some of the fuel had disintegrated along with the control rod clusters (SS and Ag-In-Cd), but I also seem to remember the damage at one corner of the core.

    Here is picture of the damaged TMI-2 core - http://americanhistory.si.edu/tmi/images/10.01_enlarged.jpg

    and - http://americanhistory.si.edu/tmi/tmi08.htm

    from - http://americanhistory.si.edu/tmi/tmi10.htm

    There was some fuel particles/chunks which fell to the bottom of the RPV, and I believe they interacted with the stainless-steel liner on the bottom.

    There are other pictures, but I can't seem to find them at the moment, but similar to

    http://www.mpra.com/graphics/d-d_tmi2coredamage.gif

    This last one shows that the one or two of the baffle plates were perforated, but the core barrel is apparently intact.
     
    Last edited: Apr 21, 2008
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