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*; *; *; *
JNC TJ9440 2000-007, 43 Pages, 2000/03
JNC-TJ9440-2000-007.pdf:1.73MB
Planning of the plutonium utihzation in the Light water thermal reactor has been investigated to evaluate scenario for FBR development. Plans for MOX fuel utilization in the ABWR including Ooma plant are studied, and information of high burnup fuels for a future BWR is summarized based on public documents. Nuclear compositions of the present burnup fuel (45,000MWd/t) and a high burnup fue (60,000MWd/t) have been evaluated using an open code: SRAC. Results of the study are follows; (1)Surveying the status of MOX fuel utilization. The status of MOX and UO
fuel utilization in the present BWR and future BWR have been summarized based on public documents. (2)Evaluation of spent MOX and UO fuel composition. Nuclear compositions of spent MOX and UO fuels at 45,000MWd/t and 60,000MWd/t burnup have been evaluated and summarized for recycle scenarios by FBR.
Ijima, Takashi; ; Matsumoto, Mitsuo; *
JNC TN3410 2000-002, 93 Pages, 2000/01
JNC-TN3410-2000-002.pdf:2.54MB
Fugen Nuclear Power Station ("Fugen") is a prototype Advanced Thermal Reactor (ATR), it has been demonstrated the plutonium utilization by loading many Mixed Oxide Fuels (MOX) since the reactor start up March 1979, and no fuel defect had been occurred, The MOX fuel assemblies has the high reliability and has been loaded more than 700 fuel assemblies. This is the largest in the world as a thermal neutron reactor. However, "Fugen" is planning to stop its operation in the year 2003, because the role of the Fugen almost finished. Therefore, we are going to summarize the ATR project including the Plutonium utilization experience. This paper is summarized as part of the experience.
Mori, Tomoaki;
PNC TN9410 98-056, 72 Pages, 1998/06
The sub-criticality monitoring system has been developed for criticality safety control in nuclear fuel handling plants. In the past experiments performed with the Deuterium Critical Assembly(DCA), it was confirmed that the detection of sub-criticality was possible to k
=0.3. To investigate the applicability of the method to more generalized system, experiments were performed in the light-water-moderated system of the modified DCA core. From these experiments, it was confirmed that the prompt decay constant(
), which was a index of the sub-criticality, was detected between k=0.623 and k 0.870 and the difference of 0.05
0.1
k could be distinguished. The values were numerically calculated with 2D transport code TWODANT and monte carlo code KENO V.a, and the results were compared with the measured values. The differences between calculated and measured values were proved to be less than 13%, which was sufficient accuracy in the sub-criticality monitoring system. It was confirmed that Feynman- method was applicable to sub-critical measurement of the light-water-moderated system.
; Yumoto, Ryozo; Sasajima, Hideyoshi*; *
PNC TN841 71-27, 92 Pages, 1971/10
no abstracts in English
Sasa, Toshinobu
no journal, ,
As a part of the activities of the "Research Committee for Thorium Nuclear System" in the Japan Atomic Energy Society, the characteristics, performance and feasibility of the proposed thorium nuclear systems from recently published open documents were surveyed in order to understand the research and development status of the thorium nuclear system around the world. Research has been conducted in the countries using nuclear power in the world such as India, Asia, Europe, and the United States. Pebble fuel or molten salts (thermal and fast neutron systems) are selected as fuel material. Regarding the core thermal output, proposals were selected from several 100 MW for demo reactors and modular reactor to 5 GW for power reactors. For the feasibility point of view, many proposals are still in the concept study phase, but there are a few concepts which aimed at licensing of already approved the domestic environmental impact assessment.