Development of particle removal technique by using bubble breakup phenomenon in converging-diverging nozzle

Uesawa, Shinichiro; Yoshida, Hiroyuki

Konsoryu Shimpojiumu 2022 Koen Rombunshu (Internet), 2 Pages, 2022/08

no abstracts in English

Refinement of a system configration control program (II); Development of the database function for cutsets of accident sequences and enhancement of GUI

*; *; *

JNC TJ9440 2000-003, 173 Pages, 1999/03

JNC-TJ9440-2000-003.pdf:19.86MB

In FY 1997, a program which evaluates the risk in each phase of the maintenance was developed to support the maintenance planning on an FBR plant. In FY 1998, the GUI (Graphical User Interface) of the program developed in FY 1997 was enhanced for its user-friendlyness including facilitation of data settings and interpretation of the computational results. Specifically, following functions were incorporated : (1)To call associated window displays (editing and reporting display) mutually. (2)To edit the combinations of the systems for their maintenance scheduling. Furthermore, some risk evaluation functions such as the database function for cutsets of accident sequences and tracking function of risk trends were developed and added to its analysis module. A series of test on the programs with the GUI and the analysis module was performed and it was verified that the progam worked correctly.

Exchange flow characteristics in a tokamak vacuum vessel of fusion reactor under the loss-of-vacuum conditions

Takase, Kazuyuki; Kunugi, Tomoaki; Seki, Yasushi

Journal of Fusion Energy, 16(1-2), p.189 - 194, 1997/00

no abstracts in English

Experimental study of buoyancy-driven exchange flow from breaches under LOVA condition

Takase, Kazuyuki; Kunugi, Tomoaki; Ogawa, Masuro; Seki, Yasushi

16th IEEE/NPSS Symp. on Fusion Engineering (SOFE '95), 1, p.317 - 320, 1996/00

no abstracts in English

Study on the main design parameters of large scale FBR (II); Study for the application of piping bellows joints to the secondary main heat transport system of LMFBR

*; *; Nakanishi, Seiji; *

PNC TN9410 88-114, 239 Pages, 1988/08

PNC-TN9410-88-114.pdf:25.56MB

The reduction of piping length of secondary main heat transport system is considered as an effective measure for the reduction of the construction cost of LMFBRs because of the reduction of piping materials including its attachments, the auxiliary system such as electric power supply system and air-conditioning system, etc., and building volume. The stress analysis of the bellows and normal piping system was performed under the same loading conditions, and a comparison was made to clarify the cost reduction effect between the both piping systems. In this study a concept of 1000MWe loop-type LMFBR plant designed in the "key Technological Design Study (II)" in 1985 was considered as a reference plant. Piping material of the normal piping system is 2.25Cr-1Mo steel. On the other hand, the piping and bellows joints are made of SUS304 and SUS316, respectively, in the bellows piping system, and the gimbal type bellows which absorb thermal expansion of the piping by their rotational angle deflection were used. It is necessary to reduce reasonably the number of the bellows joints from a viewpoints of the cost reduction of bellows piping system. For this purpose, the preliminary analysis of the piping due to thermal expansion at normal condition was performed to survey the optimum piping system arrangement considering the number and location of the bellows joints in the piping. And then, the detailed analysis of the optimized one was carried out. The analytical results were evaluated by using the "Structural Design Guide of Class I Components for Elevated Temperature Service(BDS)" and the structural integrity of the piping were confirmed. The bellows joints according with the design and arrangement conditions of the bellows piping system were selected by the screening code. The results gained from the analysis of bellows joints were evaluated by using the "Structural Design Guide for Class I piping Bellows Expansion Joints of FBR for Elevated Temperature ...

An Improved Power Method for Solving Eigenvalue Problems in Plant Dynamics and Control

JAERI-M 82-083, 47 Pages, 1982/07

JAERI-M-82-083.pdf:1.53MB

no abstracts in English

Preliminary investigation of innovative HTGR's fuel to reduce fuel temperature

Nagatsuka, Kentaro*; Sato, Hiroyuki; Imai, Yoshiyuki; Yan, X.

no journal, , 

In order to improve economics of High Temperature gas cooled reactors (HTGR) by means of increasing core power density, HTGR's fuel assembly in which converged coolant flow is adapted is proposed to achieve reduction of fuel temperature during normal operation and heat transfer flow characteristics is estimated with numerical simulation. As a result of estimation, a perspective of fuel temperature reduction is obtained without numbers of fuel enrichment which are required in the conventional method.