Conference Proceedings Paper
MONTE-CARLO SIMULATION OF THE LOW-LET RADIOLYSIS OF LIQUID WATER OVER THE RANGE 25 TO 350°C
The 5th International Symposium on SuperCritical Water-cooled Reactors - 2011 March 13-16
Sunuchakan Sanguanmith (Université de Sherbrooke)
Yusa Muroya (University of Tokyo)
Jintana Meesungnoen (Université de Sherbrooke)
Mingzhang Lin (Japan Atomic Energy Agency)
Yosuke Katsumura (University of Tokyo)
Leila Mirsaleh Kohan (Université de Sherbrooke)
David Guzonas (Atomic Energy of Canada Limited)
Craig R. Stuart (Atomic Energy of Canada Limited)
Jean-Paul Jay-Gerin (Université de Sherbrooke)
A re-examination of our Monte-Carlo modeling of the high-temperature radiolysis of liquid water by low linear energy transfer (LET ~ 0.3 keV/μm) radiation was undertaken in an attempt to reconcile our computed g-values (primary or “escape” yields) of the various radiolytic products (e-aq, •OH, H•, H2, and H2O2) with newly measured or recently re-assessed experimental data over the range from 25 up to 350°C. In the calculations, we used the radiolysis database, including the rate constants, the diffusion coefficients of the radiation-induced species, the reaction mechanisms and the g-values, recently collected and summarized by Elliot (AECL) and Bartels (University of Notre Dame). Using a global-fit procedure, experimental data were found to be best reproduced when a discontinuity in the temperature dependence of certain physicochemical parameters was introduced at ~100-150°C. The presence of such a discontinuity was hypothesized to be associated with a change in the liquid structure of water around these temperatures. In addition to the physicochemical factors intervening in the radiolysis, the importance of the reaction of H• atoms with water in contributing to the unexplained yield of H2 above 200°C was also investigated.
Individual Conference-Paper Copies (Electronic Where Available):
- For CNS members, the first 5 copies per calendar year are free, and additional copies are $10 each.
- For non-members, the price is $25 for the first Conference-paper copy in a request, and $10 each for additional copies of papers in the same conference and in the same request.
- Contact the CNS office to order reprints.