Plutonyl nitrate

Pu(N03 ) -5H2 0 deep red plutonyl nitrate hexahydrate [19125-90-7], Pu02(N03 )2-6H2 0 coral red anhydrous plutonium(IV) sulfate [13692-89-2], Pu(S0 2i pinh or redPu(S0 2 4H20 and moss green plutonyl carbonate/ P2P2-/(9-P/, PUO2CO2 (30). 

Extraction (PUREX) liquid-liquid extraction process, 19 674-675 25 420. See also PUREX flow sheet Plutonyl nitrate hexahydrate, 19 691 Plywood, 26 752... 

Uranyl nitrate and plutonyl nitrate solutions concentrated... 

KEYWORDS Dirac-Fock-Slater, DV-DFS, uranyl nitrate, neptunyl nitrate, plutonyl nitrate, stability, bonding nature... 

In the present investigation we will use the DV-DFS method to armpare uranyl, neptunyl and plutonyl nitrate dihydrates from the viewpoint of their partial densities of states due to the An components. We discuss the similarity and difference in the electronic structures of these actinide nitrate dihydrates in order to estimate their stabilities. We also apply population analysis to confirm how far the An electrons contribute to the chemical bonding between the actinide and donor oxygen atoms. Finally, we compare the bonding nature between the... 

In the upper part, the O 2p components of the ligands are dominant. Above 49gj which is occupied in the neptunyl and plutonyl nitrates. An 5f is the major component. The components and energies of each orbital are similar in all of the complexes. The electronic structures are also almost equivalent, with the exception of the number of electrons in 49g . ... 

Fig 3. Densities of 5f and 6d components for uranyl, neptunyl and plutonyl nitrates dihydrates. 

We have performed relativistic calculations on hexavalent uranyl, neptunyl and plutonyl nitrate dihydrates using the DV-DFS method. The valence energy level structures were similar to each other except for the HOMO level. The An 5f electrons of Np and Pu occupy the antibonding states and they contribute to the decrease in the bonding interaction between the actinide atoms and the oxygen atom of the water molecules. 

The solvent used in the Redox process was hexone, methyl isobutyl ketone, an extractant already in use for purifying uranium ore concentrates (Chap. 5)., Hexone is immiscible with water and will extract uranyl nitrate and plutonyl nitrate selectively from fission-product nitrates if the aqueous solution has a sufficiently high nitrate ion concentration. In the Redox process, aluminum nitrate was used as salting agent because high concentrations of nitric acid would decompose the hexone solvent. 

Figure 10.1 is a material flow sheet for the first cycle of one form of the Redox process [F3]. Rutonium in the feed was converted to hexavalent plutonyl nitrate Pu 02(N0s)j, by oxidation with dichromate ion Cr2 07 ", as this is the plutonium valence with highest distribution coefficient into hexone. In the decontamination contactor, hexavalent uranium and plutonium nitrates were extracted into hexone solvent, and fission-product nitrates were removed from the solvent by a scrub solution containing aluminum nitrate, sodium nitrate, and sodium dichromate. 

Plutonium in oxide fuel dissolves as a mixture of tetravalent and hexavalent plutonyl nitrates, both of which are extractable with TBP. Neptunium dissolves as a mixture of inextractable pentavalent and extractable hexavalent nitrates. 

Plutonyl nitrate, when treated with COf" at pH 4—7, gave PUO2CO3, which is isostructural with UO2CO3. 

U233 and 9433 may be dispersed in water as soluble 6 uranyl and plutonyl (PuOa ) salts, such as uranyl and plutonyl nitrate, sulphate or fluoride, or as an alkali metal uranyl or plutonyl carbonate. Such a solution with the proper isotope concentration in water of either type and in a container of the proper size will sustain a 10 chain reaction with a low neutron loss except for exterior neutron leakage, which will be very high. 

U-fission product mixtiires (extraction of quaternary alkylammonium-plutonyl nitrate complex into hexone-TTA extraction... 

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