Controlled reactive mechanical alloying

R.A. Vaiin, S. Li, A. Calka, D. Wexler, Formation and environmental stability of nanocrystalline and amorphous hydrides in the 2Mg-Fe mixture processed by controlled reactive mechanical alloying (CRMA) , J. Alloys Compd. 313 (2004) 270-286. 

Key words hydrogen storage/nanostructured light metal-based hydrides/controlled reactive mechanical alloying/magnesium hydride/amorphous hydrides... 

R.A. Varin, T. Czujko, Ch. Chiu, Z. Wronski, Particle size effects on the desorption properties of nanostructured magnesium dihydride (MgH ) synthesized by controlled reactive mechanical milling (CRMM), J. Alloys Compd. 424 (2006) 356-364. 

R.A. Varin, S. Li, A. Calka, Environmental degradation by hydrolysis of nanostructured P-MgH, hydride synthesized by controlled reactive mechanical milling, . /. Alloys Compel. 376 (2004) 222-231. 

The Model 412 PWR uses several control mechanisms. The first is the control cluster, consisting of a set of 25 hafnium metal rods coimected by a spider and inserted in the vacant spaces of 53 of the fuel assembhes (see Fig. 6). The clusters can be moved up and down, or released to shut down the reactor quickly. The rods are also used to (/) provide positive reactivity for the startup of the reactor from cold conditions, (2) make adjustments in power that fit the load demand on the system, (J) help shape the core power distribution to assure favorable fuel consumption and avoid hot spots on fuel cladding, and (4) compensate for the production and consumption of the strongly neutron-absorbing fission product xenon-135. Other PWRs use an alloy of cadmium, indium, and silver, all strong neutron absorbers, as control material. 

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