There are different kinds of reactors with varying degrees of containment and redundant protective equipment. A PWR which runs enriched fuel has inherent risks that a PHWR doesn"t. Used PWR fuel will take off and go critical in the used fuel bay if surrounded by plain water. That is what happened in Japan when cooling was interrupted and the bay was refilled with water lacking sufficient boron neutron absorber. The Japanese used fuel bays also contained many years worth of used fuel that should have been in long term storage decades ago. Used PHWR fuel is inert when placed in ordinary water. The PHWR around here have everything behind one or two reinforced heavy grade concrete walls four feet thick each. One regular backup generator, six backup generators , two emergency backup generators and connections for fire truck pumpers. Plus all the battery backup pumps and two elevated cooling water storage tanks. Then there is the vacuum containment system to purge any leaks and filter system to scrub anything if the vacuum system fills up. Much different than Chernobyl , three mile or Japan designs. Our operators also have the training and option to think out of the box if an unique problem arises that is not covered in the procedures.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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