Misc.

Feb, 1997

Burn-up reactivity measurements of the Joyo MK-II core

PNC TN9410 97-022
  • Nagaoki Yoshihiro

First page
34
Last page
Language
Japanese
Publishing type
Internal/External technical report, pre-print, etc.

The core averaged burn-up reactivity has been measured and calculated for the Joyo MK-II core. In order to evaluate the relationship between the calculational error of burn-up reactivity and the nuclear data or calculated neutron flux, the burn-up reactivity for an individual fuel subassembly(S/A) must be measured. So the burn-up reactivity measurement test was conducted on the MK-II core. The burn-up reactivity for a driver fuel S/A was measured as a substitution reactivity worth between two S/As at different burn-ups. In the test a fuel S/A with a burn-up of 1 GWd/t was substituted by two S/As with 37 and 62 GWd/t, respectively. The substitutions were carried out at the core center(row 0), middle of the fuel region(row 2)and the border region of the fuel and reflector(row 4). The calculated burn-up reactivity worth performed by the core management code system "MAGI" was compared with the measured value. The results obtained were as follows: (1)Measured substitution reactivity worth(at row 0) between 1 and 37 GWd/t fuel S/A was -0.19\%$\Delta$k/kk' and that between 1 and 62 GWd/t was -0.28\%$\delta$k/kk'. (2)Relative distribution of the reactivity worth between 1 and 37 GWd/t agreed with that between 1 and 62 GWd/t. The relative value normalized at core center was 0.67 for the row 2 and 0.28 for the row 4. (3)The C/E value was 1.03$\sim$1.05 for the substitution between 1 and 37 GWd/t and 0.94$\sim$0.95 between 1 and 62 GWd/t at the row 0 and 2. It was clear that the C/E values at the row 4 are higher than those at the row 0 and 2 by 5$\sim$7\%. An analysis of the burn-up dependency on the C/E value of the burn-up reactivity worth is being performed in detail. Presents, the PIE of the fuel S/A used for the measurement is under way.

Link information
URL
https://jopss.jaea.go.jp/search/servlet/search?4036138

Export
BibTeX RIS