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JAERI-Tech 96-006, 86 Pages, 1996/02
no abstracts in English
; Haga, Kazuo
PNC TN9410 92-095, 84 Pages, 1992/03
[Objective] The objective of this report was image construction of a fast reactor for a manned deep sea base expected in a next century. The fast reactor will be used as power and heat sources. [Method] Based on ocean data clarified up to now, the following fast reactor system conception was studied with reference to a closed Brayton cycle system for a very small reactor. Power source (about 400 kWe) (1)Sodium cooled fast reactor system (2)Lithium cooled fast reactor system Heat source (2,235 KWt) (3)Sodium cooled fast reactor system [Result] The system image of a reactor and primary/secondary loops set in a pressure hull using two or three spheres was constructed for each system. It was cocluded that the technical feasibility of the fast reactor system was high for the base.
; Haga, Kazuo
PNC TN9410 92-050, 71 Pages, 1992/02
Objective : A conceptual design of a fast reactor system was studied for deep sea research submersibles diving to the maximum depthes of 10,924m and 8,000m. Method : A space reactor concept was used for the system. Primary coolant of the system was NaK, whose temperatures was set as 680 and 550 
C at the exit of a reactor vessel. Secondary system was a closed brayton xcycle using He(60)-Xe(40) gas as working fluid. Electric power output was 20kWe. Thermal efficiency, transported thermal energy, and flow rates and temperatures of the gas and NaK were calculated at closed Brayton cycle analyses. Results : The conceptual design was drawn, based on the size of an each component fixed with the calculated results of these values. The system could be set in a pressure hull comprising of a 2.3m
shere and a 1.1m pipe. A simple figure was drawn of the research submersible loading the system. The whole length of the submersible was about 14m. Its weights were about 100ton and 70ton for the maximum depthes of 10,924m and 8,000m respectively. It could be carried by a nother ship. Conclusion : The submersible had the following features compared with the one loading electric cells on account of affluent electric power generation by the fast reactor system. A continuous stay longer than a week and movement at a high speed were made possible over a deep sea bottom. An illuminated region was very wide during sea bottom survey. Observation by watching was possible over a wide region. Therefore the submersible could be considered to be used for detail observation over crackes in the Japan trench and etc.
; Haga, Kazuo
PNC TN9410 91-305, 20 Pages, 1991/09
Additional calculation was performed concerning "Study of Weight of Fast Reactor Power System for Deep Sea Research" (PNC ZN9410 91-176) published in 1991. In the above report, weight was calculated of power systems of 10kWe for an unmanned base located at the depth of water of 8,020m and of 20kWe for a research submersible diving to that of 10km. The power systems consisted of fast reactor systems and pressure hulls. The main points of the additional calculation were as follows. (1)The depth of water was not fixed, but treated as a parameter. (2)When the power systems will be used in future, some buoyancy material will be attached to the systems in order to make the weight of the systems zero in the sea water. The weight of the buoyancy material was also calculated in this report. (3)In the case of 10kWe power source, electric power was generated by eight sets of closed Brayton cycles of 1.3kWe, but two sets of 5kWe were used in this report. The additional calculation lead to the result that the total weight of the power systems at the depth of water containing the buoyancy material were 13.6t and 13.9t for 10kWe and 20kWe respectively.
; Haga, Kazuo
PNC TN9410 91-185, 62 Pages, 1991/05
Conceptual design of a 200kWe power source for a 6.5 km class research submersible was performed by using a sodium and a lithium cooled high temperature reactors and a closed Brayton cycle system. The SPECTRA, which had been already designed as a portable reactor, was employed in the conceptual design. A pressure hull, made of high strength steel containing 10 % Ni, had the shape of two spheres connected horizontally, which had the same inner diameter of 3 m. Heat removal from the reactor system was by heat transfer to the sea water after thermal conduction through the pressure hull. The conceptual design work confirmed the technical availability of this system as the power source for the deep sea research submersible.
