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    Re: Iodide:
    From: Alan S
    Date: 2011 Mar 19, 16:45 -0700


    The following excerpted from your post, "The core remains hot, though, and in both cases auxiliary cooling systems designed to cool the core failed."

    It would appear that, putting it politely, insufficient attention was given to the necessity, the importance of maintaining the availability, the flow of cooling water.

    Re TMI, from what I’ve read about it, the following seemed to have been a major contributor to problems there. Instrument failure, as follows. It seems that the situation, particular valving being open or closed, was not indicated, as it should have been, which reflected the below mentioned poor instrument design.

    The valve in question was solenoid operated. Instrument panel indicators showed the position of the solenoid, which in theory would have indicated the situation with the valve, open or closed. Unfortunately, the "push rod" or "pull rod", whichever it was, which actually operated the valve had been disconnected from the valve itself, so that while the solenoid was "pushing" or "pulling", due to it's being disconnected from the valve, nothing happened, though instrument/control panel indicators said otherwise, ergo bad instrument design. Limit switches attached to or mounted on the valve itself would have shown the position of the valve itself.

    The foregoing represents my understanding of the incident, which could be wrong.

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