Weapons-grade plutonium dispositioning. Volume 4. Plutonium by Olsen, C.S.; Sterbentz, J.W.; Sinha, U.P.; USDOE,

By Olsen, C.S.; Sterbentz, J.W.; Sinha, U.P.; USDOE, Washington, DC (United States);National Academy of Sciences, Washington, DC (United States); Idaho National Engineering Laboratory.; Idaho National Engineering and Environmental Laboratory.; United States.

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Extra info for Weapons-grade plutonium dispositioning. Volume 4. Plutonium dispositioning in light water reactors

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PuOE(ThO2) The corresponding plutonium rod mass loadings at BOC and EOC for the PuO2(ThO2) and PuOE(UO2) fuel compositions are given in Table 5. 038 Table 5. 0 g/rod Gd203 mass loading in a PuO2(ThO2) fuel composition is strongly negative as shown in Figure 2 and tabulated in Table I. Presumably, the prompt fuel temperature coefficient will become less negative with increasing Gd203 content due to the reduction in 232Th and the increase in 239pu as indicated in Figure 2. 2 Total bumup times. 6 g/rod.

_ - PuO=11hO21 - P,,O2(ThO2l(Gd 20 s) 20 E _ 10 ..................... _4 0 ............................... _................................................. z.......... _ ............................... l I .... o, '_ •5 l " . - 10 .... _ _ _ ............. ZL ....... o,,, ......... -50 ,,' 300 ...... 350 ....... , 400 450 Isothermal Temperature -, 500 .... , 550 600 (K) Figure 7. Isothermal temperature coefficient comparison for PuO2(ThO2), PuO2(ThO2)(ZrO2), PuOE(ThO2)(Gd203) fuels relative to the PuO2(ZrO2) fuel composition.

The integrated dry route and the coprecipitation processes are used at the Siemens Hanau fuel fabrication plant at Hanau, Germany. 9 Until 1980, Siemans/Kraftwerk Union used the integrated dry route process and then switched to the coprecipitation process in 1981 to enhance the PuOx dissolution by nitric acid. I° Belgium fabricates MOX fuel by mechanical blending but uses a special process to obtain very fine UO2 and PuO2 powders, which when mixed and blended result in a dissolvable fuel form. 2 Integrated Dry Route Process.

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