Nuclear Fuel Complex supplies zircaloy clad uranium oxide fuel assemblies and zirconium alloy structural components for all 14 operating atomic power reactors in India.
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If you are talking about Zircaloy-4 when you mean ZR-4, I stumbled across some micrographs from an electrode corrosion test.
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The cylindrical pellets are then clad in a corrosion-resistant zirconium metal alloy Zircaloy which are backfilled with helium to aid heat conduction and detect leakages.
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Hydrogen is released in an amount of about 0.5 m 3 of hydrogen ( at normal temperature / pressure ) per kilogram of zircaloy oxidized.
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As Project Director, Brahm Prakash helped set up facilities for large scale production of zirconium sponge, zirconium mill products, and zircaloy clad ceramic uranium oxide fuel elements.
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In regular operation, most hydrogen is safely neutralized in the reactor systems; however, a fraction of 5-20 % diffuses into the Zircaloy rods forming zirconium hydrides.
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To allow the neutrons to flow freely between the bundles, the tubes and bundles are made of neutron-transparent zircaloy ( zirconium + 2.5 % wt niobium ).
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The Chernobyl corium is composed of the reactor uranium dioxide fuel, its zircaloy cladding, molten concrete, and decomposed and molten serpentinite packed around the reactor as its thermal insulation.
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It is loaded into capsules of the zirconium alloy zircaloy-2 ( a very nonreactive alloy transparent to neutrons ) to a pressure of about 100 bars ( about 100 atmospheres ).
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:Zircaloy's major advantage over other cladding options is that it has a very low neutron absorption cross section . talk ) 13 : 21, 14 March 2011 ( UTC)
