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Takahashi, Hiroki; Yamamoto, Kazuyoshi; Yoritsune, Tsutomu; ;
JAERI-Tech 99-037, 44 Pages, 1999/03
no abstracts in English
; Nagaoki, Yoshihiro
PNC TN9410 97-022, 34 Pages, 1997/02
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%
k/kk' and that between 1 and 62 GWd/t was -0.28%
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
1.05 for the substitution between 1 and 37 GWd/t and 0.940.95 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 57%. 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.
Yoshikawa, Shinji; Ozawa, Kenji; ; Odo, Toshihiro
PNC TN9410 95-160, 18 Pages, 1995/06
This paper presents a study on knowledge dependency of plant operator behavior. The ultimate purpose of this study is to establish a methodology to support human operators in forming an integral understanding (i.e., mental model) of target plants, and thus to enhance potential performance in unexpected situations and in non routine cognitive tasks. The authors conducted a series of experiments to acquire behavioral data of two plant anomalies not included in the training curriculum. A formulation methodology of operator protocols has been proposed from the observations of the acquired behavioral data. It has been concluded that engaged plant operators have sufficient knowledge about physical phenomena of the major components, and that possible improvements of operators' cognitive performance can be expected mainly by knowledge enhancement about utilization strategy of physical information.
Sugimoto, Masayoshi; Nagai, Ryoji; ; Sawamura, Masaru; Takao, Masaru*; Kikuzawa, Nobuhiro; Okubo, Makio; Minehara, Eisuke
Nuclear Instruments and Methods in Physics Research A, 358, p.ABS83 - ABS84, 1995/00
Times Cited Count：1 Percentile：23.89(Instruments & Instrumentation)no abstracts in English
