Experimental study using an LWR-type critical assembly, NCA, has been conducted on the reactivity worth of the burnable poison (BP) that is employed in a small reactor, 4S, for achieving an extremely long core life. The experimental BP is composed of natural gadolinium oxide (Gd2O3) mixed in polyethylene. Three types of BPs are prepared: polyethylene without Gd, polyethylene with Gd/H ratio of 0.015at% and 0.943at%. Reactivity worth of each BP assembly is measured through change in critical water height. Power profile of fuel rods and flux profile are also measured. Analyses are conducted with a Monte-Carlo code, MCNP.
- Nuclear Engineering Division
Experimental Study on Reactivity Worth of Burnable Poison in Ultra-Long Life, Small LMR
Kikuchi, S, Tsuji, K, Nishikawa, A, Inagaki, H, Yoshioka, K, Matsumiya, H, & Yamaoka, M. "Experimental Study on Reactivity Worth of Burnable Poison in Ultra-Long Life, Small LMR." Proceedings of the 10th International Conference on Nuclear Engineering. 10th International Conference on Nuclear Engineering, Volume 2. Arlington, Virginia, USA. April 14–18, 2002. pp. 617-620. ASME. https://doi.org/10.1115/ICONE10-22231
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