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Operational Feedback Ventional Enriched FA

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Operational Feedback Ventional Enriched FA Background › Starting in 2009, Framatome has been supplying Size- › Totally Framatome has delivered more than 1000 FAs to well B* with fuel assemblies (FAs) with Enriched Re- Sizewell B, approximately half of them containing ERU. processed Uranium (ERU). The enrichment process of the reprocessed uranium is completed in Russia with an objective of minimizing even › Reprocessed uranium is understood as a secondary uranium isotopes such as 232U and 236U. The even isoto- uranium supply pes do not contribute to fi ssion; they are considered – by direct enrichment services to be an absorber and therefore, their presence needs to be minimized, which improves overall fuel utilization. – by blending with other feed material of a higher The low residual fraction of these parasitic isotopes is enrichment compensated by having slightly higher enrichment of 235U – by a combination of both to achieve equivalent reactivity to conventional enriched Enriched uranium.1,2 Reprocessed Uranium Neutronic Design › T he neutronic design of ERU FAs is designed for having the same reactivity characteristic as the equivalent con- Operational Feedback ventional enriched FA. This is achieved by the compen- sation of the 236U and other isotopes content through higher 235U enrichment (see fi g. 1 and 2). › Figure 2 shows the kinf versus the FA burn up of up to 80 MWd/kgU. Since the kinf values are very similar for ENU (enriched natural uranium) and ERU (enriched re- Fig. 2 Fig. 1 k comparison of ENU and ERU fuel versus processed uranium) fuel, the delta is shown as well in inf 235U compensation burn up – for neutronic FA design, upper the lower section. for 236U content part, in the lower part the delta is shown The neutronic design for ENU and ERU fuel can be considered as equal.3,4 Author/Speaker Ingo Koban Framatome GmbH Paul Gossen Straße 100 Manufacturing 91052 Erlangen, Germany › The ERU-cooperation between Framatome and MSZ Elek- assembly manufacturing of MSZ had to be adapted to trostal (MSZ) was agreed and was begun in the 1990s. Framatome requirements. › As part of this fabrication alliance, Framatome supplies › MSZ provides the medium enriched uranium for blending Co-Authors all structural components such as the end fi ttings and where suitable and manages the partial direct enrich- structural cages/skeletons in addition to the cladding ment of the reprocessed uranium in Russian enrichment with one end already welded. facilities. MSZ then combines or blends the materials, Roger Float fabricates the fuel pellets from the ERU powder, loads › Framatome qualifi ed the manufacturing steps, compri- the pellets into the cladding, welds the fi nal end caps EDF Energy Nuclear Generation Limited sing the blending procedure along with further proces- and assembles the fi nal assemblies using the supplies’ Barnet Way sing steps up to fi nal fuel assembly. Parts of the fuel components (see fi g. 3). Barnwood, Gloucester, GL4 3RS, UK Spent Fuel from Western RepU Enriched W. RepU Mixing of enriched RepU Western Reactor 0,7 % U-235 0,3 % U-235 < 0,5 % U-235 Europe Peter Newby Western Reprocessing Blending SCC Tails UNAT Framatome Inc. 0,3 % U-235 3315 Old Forest Rd Russian Spent SCC RepU Enriched SCC RepU ERU for Costumer Fuel SCC 0,65 % U-235 4,95 % U-235 < 5 % U-235 equiv. Lynchburg, VA 24501, USA SCC Enrichment Direct Reprocessing Reprocessing Blending MSZ Tails ERU Pellet Scrap Scrap pellets Nico Vollmer 0,20 % U-235 MSZ 4,xx % U-235 Framatome GmbH Fig. 3 ERU Powder Scrap Scrap powder MSZ 4,xx % U-235 Paul Gossen Straße 100 Steps to provide ERU fuel to Sizewell B MSZ Recycling 91052 Erlangen, Germany The main drivers for the use of ERU are economic advantages, access to material, and the obligation to use the reprocessed uranium (RepU) coming from reprocessing. Operational Experience › Since the year 2000 the annual delivery volume reached › Up to now, more than 4000 ERU fuel assemblies delivered an industrial scale and is today about 100 tU per year. by Framatome have been inserted in PWR and BWR plants in Europe. These fuel assemblies have attained › In addition to complete ERU fuel assemblies, signifi cant burnups in excess of 65 MWd/kgU (see fi g. 4 and 5). volumes of ERU fuel pellets have been shipped to manu- facturing sites of Framatome for the fabrication of fuel assemblies in those facilities. Fig. 5 Fig. 4 Fuel assembly burnup distribution for ERU fuel Quantitative operational experience of ERU fuel worldwide delivered by Framatome Today, Framatome delivers ERU fuel assemblies to eight different customers. The use of ERU fuel is very similar to the use of “normal” enriched uranium, just more economic. Although there are specifi c technical requirements to manufacture the ERU fuel, the overall economical benefi t continues to drive the utilities’ desire to use ERU. References 1 W. Goll, D. Porsch, F. Schlemmer, “Betriebsverhalten von Brennstäben mit wiederaufgearbeitetem Uran“, Jahrestagung Kerntechnik JK ’97, Karlsruhe (1997), 421-424 2 F. Schlemmer, H. P. Fuchs, R. Manzel, “Status of irradiation experience with recycled fuel materials in the FRG for SIEMENS/KWU type fuel assemblies”, Technical Committee Meeting on Recycling of Plutonium and Uranium in Water Reactor Fuels, Cadarache, France, Nov. 1989 3 W. D. Krebs, G. J. Schlosser, “Status of design and operational experience with enriched reprocessed Uranium (ERU) Fuel in the FRG for Siemens/KWU type LWRS”, Technical Committee Meeting on Recycling of Plutonium and Uranium in Water Reactor Fuels, Cadarache, France, Nov. 1989 4 Friedrich Burtak, Dieter Porsch (Framatome GmbH), “Use of the Blending Process for the Recycling of Reprocessed Uranium in Light Water Reactors“, Global 2001, Paris, France, September 9–13, 2001 * Sizewell B is a PWR containing 193 FAs which have a 17 x 17 fuel rod matrix with an active length of 12 feet (approximately 3.66 m). Sizewell B was connected to the grid in 1995, it currently operates on an 18 month cycle length. The fuel assembly design qualifi ed for Sizewell B is the proven Framatome 17 x 17 HTP fuel assembly. Framatome 09/2019: and Copyright Editor.
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