PHILIPPE PSAILA / SCIENCE PHOTO LIBRARY PHILIPPE PSAILA / SCIENCE PHOTO LIBRARY
Nuclear power station construction. Workers using liquid nitrogen during the process of inserting guide rods through the holes on the top of the cover of a nuclear reactor. The liquid nitrogen is used to cause the metal to contract, allowing the rods to be inserted. When the rods warm up, they will expand and be held securely in place. The guide rods are structures through which control rods will be lowered into and withdrawn from the reactor. Control rods consist of a moderator material that absorbs neurtrons and allows control of the fission reaction in the reactor core. This fission reaction releases energy that is used to generate electricity. Photographed at Framatome ANP's facility at Chalon/Saint Marcel, France.
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