Energywise Contributions of Th, Pu and U Isotopes to the Reactivity Feedbacks of (Th-LEU) Fuelled AHWR
Advanced heavy water reactor (AHWR) has been designed with thorium-based fuel cycle and boiling light water as coolant. The coolant void reactivity (CVR) and fuel temperature reactivity (FTR) are the main reactivity feedback mechanisms. In the present work, we have attempted to understand the physics behind CVR and FTR by estimating the energywise isotopic contributions for AHWR fuelled with (Th, LEU) fuel. The normalised reaction rate approach was used to quantify the individual contributions from 232Th, U, Pu, H and other isotopes. It has been shown that 232Th capture plays a major role in making these coefficients negative. This led us to study the sensitivities of these isotopes to the reactivity coefficients to the basic nuclear cross-section set. The sensitivity due to nuclear data to CVR and FTR from ENDF/B-VI.8 and JENDL 3.3 has been calculated. It is shown that FTR is less sensitive to the dataset whereas the CVR is 16% lower in the JENDL3.3 dataset as compared to the ENDF/B-VI.8.
KeywordsAHWR-LEU fuel CVR FTR D5 cluster Isotopic reaction rates
- 1.A. Chakraborty et. al., AHWR-LEU SARP, BARC, March 2013Google Scholar
- 2.A. Sarkar, U. Kannan, P.D. Krishnani, Sensitivity studies for (Th, LEU) fueled AHWR with different 172 multi- group nuclear cross section sets, in National Conference on Power from Thorium (NCPTh), Mumbai, 22–24 Dec 2014Google Scholar
- 3.U. Kannan, A. Kumar, A. Sarkar, S. Ganesan, P.D. Krishnani, Sensitivity studies on nuclear data for thorium fuelled advanced heavy water reactor (AHWR), in Proceedings of 5th AASPP Workshop on Asian Nuclear Reaction Data Development, INDC(IND)0048, pp. 133–139Google Scholar
- 5.U. Kannan, S. Ganesan, Analysis of coolant void reactivity of advanced heavy water reactor (AHWR) through isotopic reaction rates. Nucl. Sci. Eng. 167(12), 105–124 (2011)Google Scholar
- 6.J.R. Askew, F. Fayers, P. Kemshell, A General Description of the Lattice Code WIMS (British Nuclear Energy Society, 1966)Google Scholar