By Erich R. Merz (auth.), Erich R. Merz, Carl E. Walter (eds.)
A survey of modern advancements within the box of plutonium disposal by way of the appliance of complicated nuclear structures, either serious and subcritical. present nationwide R&D plans are summarized. The actinide-fuelled serious reactors are linked to keep an eye on difficulties, seeing that they generally tend to have a small behind schedule neutron fraction coupled with a small Doppler influence and a good void coefficient. present pondering is popping to accelerator-driven subcritical structures for the transmutation of actinides.
The book's end is that many of the platforms proposed are technically possible, even supposing now not but technically mature. The booklet provides a different precis and overview of all appropriate probabilities for burning surplus plutonium, offered through specialists from various varied disciplines and pursuits, together with the defence institution. the most obvious factor - the non-proliferation of nuclear guns - is key, however the subject represents a posh technological problem that still calls for an evaluation in monetary terms.
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Extra info for Advanced Nuclear Systems Consuming Excess Plutonium
The fissile fraction decreas es significantly if the discharge burn up is increased from 33 to 50 GWD/TH M. Higher U 235 enrichment causes less in situ plutonium burning for the same discharge burnup and leads to higher fissile fractions of th e plutonium . 2. Plutonium multi-recycling in PWRs. g. in Fran ce and in Germany. Until now mainly good quality plutonium with high fissile fra ctions has been utilized for discharg e burnups of ~35 GWD /THM . Th e potential of plutonium multi-recycling in PWRs has been analyzed in some detail in common benchmark investigations of 31 FZK and EDF 4, 5.
Printed in the Netherlands. 22 2. PLUTONIUM ISOTOPIC COMPOSITION VARIETY Plutonium which is built-up inevitably in nuclear reactors is characterized by the variety and diversity of its isotopic composition. Plutonium isotopic composition depends on the type of reactorproducer, the value of spent fuel burn-up and many other factors. Plutonium being produced in thermal reactors of the civilian nuclear power plants (NPPs) has as a rule large amount of higher plutonium isotopes which can reach up to 60 % of the total plutonium.
In add it ion to burning plutonium, special investigations were devoted to the transmutation of MAs. The add ition of MAs (especially of N p237) causes a moderate reduction of the burnup reactivity swing but causes a pronounced reduction of the Dopp ler effect due to the large absorption cross sections of these MAs in that part of the resonance region which main ly contributes to the Doppler effect. T his drawback of MA addition can be mitigated or compensated in such a way that t he ratio of coolant void effect to Doppler effect is simi lar to t hat of a burner reactor without MA add ition by replacing diluent or inert material in diluent subassemblies (S/ As) or in so-called "empty" pins of fuel S/As by a suitable moderator material like B eO or BllC (boron carbide with a practically vanishing content of B lO ) .
Advanced Nuclear Systems Consuming Excess Plutonium by Erich R. Merz (auth.), Erich R. Merz, Carl E. Walter (eds.)