scholarly journals Multiphysics Model Development and the Core Analysis for In Situ Breeding and Burning Reactor

2013 ◽  
Vol 2013 ◽  
pp. 1-14 ◽  
Author(s):  
Shengyi Si
Keyword(s):  
Power Distribution ◽  
Model Development ◽  
Computer Code ◽  
Ceramic Composites ◽  
Fuel Pellet ◽  
Ceramic Pellet ◽  
Sic Ceramic ◽  
Calculation Results ◽  
Gen Iv

The in situ breeding and burning reactor (ISBBR), which makes use of the outstanding breeding capability of metallic pellet and the excellent irradiation-resistant performance of SiCf/SiC ceramic composites cladding, can approach the design purpose of ultralong cycle and ultrahigh burnup and maintain stable radial power distribution during the cycle life without refueling and shuffling. Since the characteristics of the fuel pellet and cladding are different from the traditional fuel rod of ceramic pellet and metallic cladding, the multiphysics behaviors in ISBBR are also quite different. A computer code, named TANG, to model the specific multiphysics behaviors in ISBBR has been developed. The primary calculation results provided by TANG demonstrate that ISBBR has an excellent comprehensive performance of GEN-IV and a great development potential.

A study on in-situ synthesis of TiB2–SiC ceramic composites by reactive hot pressing

2014 ◽  
Vol 40 (1) ◽  
pp. 2305-2313 ◽  
Author(s):  
Guolong Zhao ◽  
Chuanzhen Huang ◽  
Hanlian Liu ◽  
Bin Zou ◽  
Hongtao Zhu ◽  
...  
Keyword(s):  
Hot Pressing ◽  
Ceramic Composites ◽  
In Situ Synthesis ◽  
Sic Ceramic ◽  
Reactive Hot Pressing

Synthesis and Properties of Ti3SiC2/SiC Ceramic Composites

2005 ◽  
Vol 475-479 ◽  
pp. 1243-1246 ◽  
Author(s):  
Tong Wei Lin ◽  
Wen Bin Cao ◽  
Jiang Tao Li ◽  
Chang Chun Ge
Keyword(s):  
Phase Composition ◽  
Active Carbon ◽  
Hot Pressing ◽  
Ceramic Composites ◽  
Displacement Reaction ◽  
Starting Mixture ◽  
Sic Ceramic ◽  
Different Content

Ti3SiC2/SiC ceramic composites with different content of SiC were synthesized through in-situ solid displacement reaction by hot pressing from starting mixture powders of TiC, Si and active carbon. The densities of the specimens were measured, the phase composition of the specimens was identified by XRD, and the microstructures were observed by SEM.

Oxidation Behavior of Ti3SiC2-SiC Ceramic Composites

2007 ◽  
Vol 561-565 ◽  
pp. 687-691
Author(s):  
De Gui Zhu ◽  
Zhi Gang Wang
Keyword(s):  
Oxidation Resistance ◽  
Hot Isostatic Pressing ◽  
Ceramic Composites ◽  
Temperature Oxidation ◽  
Parabolic Law ◽  
Sic Ceramic ◽  
Long Time ◽  
Better Than ◽  
Oxidation Behaviors

The high temperature oxidation behaviors of the Ti3SiC2-SiC ceramic composites fabricated by in situ synthesis under hot isostatic pressing were studied by DSC. The results show that the growth of the oxide scales on Ti3SiC2-SiC ceramic composites obeys a parabolic law in air. The oxidation resistance at 1400°C is better than that at 1200°C for long time. The oxidation resistance of the Ti3SiC2-SiC ceramic composites is much higher than that of monolithic Ti3SiC2. The mechanism of oxidation of Ti3SiC2-SiC ceramic composites is discussed.

scholarly journals Neutronics feasibility of using Gd₂O₃ particles in VVER-1000 fuel assembly

2016 ◽  
Vol 6 (3) ◽  
pp. 1-7
Author(s):  
Van Khanh Hoang ◽  
Phi Hung Hoang Thanh ◽  
Hoai Nam Tran
Keyword(s):  
Thermal Conductivity ◽  
Fuel Assembly ◽  
High Power ◽  
Power Distribution ◽  
Fuel Pellet ◽  
Power Peak ◽  
Calculation Results ◽  
Fuel Pin ◽  
High Burnup ◽  
Power Densities

Neutronics feasibility of using Gd2O3 particles for controlling excess reactivity of VVER-1000 fuel assembly has been investigated. The motivation is that the use of Gd2O3 particles would increase the thermal conductivity of the UO2+Gd2O3 fuel pellet which is one of the desirable characteristics for designing future high burnup fuel. The calculation results show that the Gd2O3 particles with the diameter of 60 µm could control the reactivity similarly to that of homogeneous mixture with the same amount of Gd2O3. The power densities at the fuel pin with Gd2O3 particles increase by about 10-11%, leading to the decrease of the power peak and a slightly flatter power distribution. The power peak appears at the periphery pins at the beginning of burnup process which is decreased by 0.9 % when using Gd2O3 particles. Further work and improvement are being planned to optimize the high power peaking at the beginning of burnup.

In-situ HIP synthesis of TiB2/SiC ceramic composites

1999 ◽  
Vol 89-90 ◽  
pp. 457-461 ◽  
Author(s):  
Zhu Degui ◽  
Liu Shikai ◽  
Yin Xiandong ◽  
Yang Liu ◽  
Xiao Chuanchun ◽  
...  
Keyword(s):  
Ceramic Composites ◽  
Sic Ceramic

Coliform transport in a pristine reservoir: modeling and field studies

1998 ◽  
Vol 37 (2) ◽  
pp. 137-144 ◽  
Author(s):  
Elisa Garvey ◽  
John E. Tobiason ◽  
Michael Hayes ◽  
Evelyn Wolfram ◽  
David A. Reckhow ◽  
...  
Keyword(s):  
Model Development ◽  
Fate And Transport ◽  
Field Studies ◽  
Meteorological Conditions ◽  
Reservoir Modeling ◽  
Vertical Circulation ◽  
Quality Model ◽  
Circulation Patterns ◽  
In Situ Experiments

This paper reports on field studies and model development aimed at understanding coliform fate and transport in the Quabbin Reservoir, an oligotrophic drinking water supply reservoir. An investigation of reservoir currents suggested the importance of wind driven phenomena, and that both lateral and vertical circulation patterns exist. In-situ experiments of coliform decay suggested dependence on light intensity and yielded an appropriate decay coefficient to be used in CE-QUAL-W2, a two-dimensional hydrodynamic and water quality model. Modeling confirmed the sensitivity of reservoir outlet concentration to vertical variability within the reservoir, meteorological conditions, and location of coliform source.

Pellet-Cladding Interaction of LMFBR Fuel Elements at Unsteady State: An Introduction to Computer Code ISUNE-5

1981 ◽  
Vol 103 (4) ◽  
pp. 627-636 ◽  
Author(s):  
B. M. Ma
Keyword(s):  
Reactor Core ◽  
Fatigue Cracking ◽  
Computer Code ◽  
Fuel Burnup ◽  
Fuel Pellet ◽  
Gas Release ◽  
Unsteady State ◽  
Fission Gas ◽  
Fuel Elements ◽  
Fission Gas Release

The fuel pellet-cladding interaction (PCI) of liquid-metal fast breeder reactor (LMFBR) fuel elements or fuel rods at unsteady state is analyzed and discussed based on experimental results. In the analyses, the heat generation, fuel restructuring, temperature distribution, gap conductance, irradiation swelling, irradiation creep, fuel burnup, fission gas release, fuel pellet cracking, crack healing, cladding cracking, yield failure and fracture failure of the fuel elements are taken into consideration. To improve the sintered (U,Pu)O2 fuel performance and reactor core safety at high temperature and fuel burnup, it is desirable to (a) increase and maintain the ductility of cladding material, (b) provide sufficient gap thickness and plenum space for accommodating fission gas release, (c) keep ramps-power increase rate slow and gentle, and (d) reduce the intensity and frequency of transient PCI in order to avoid intense stress fatigue cracking (SFC) and stress corrosion cracking (SCC) due to fission product compounds CsI, CdI2, Cs2Te, etc. at the inner cladding surface of the fuel elements during PCI.

Oxidation Behaviors of TiB2-TiCX and TiB2-TiCX/15SiC Ceramics

2010 ◽  
Vol 105-106 ◽  
pp. 179-183 ◽  
Author(s):  
De Gui Zhu ◽  
Hong Liang Sun ◽  
Yu Shu Wang ◽  
Liang Hui Wang
Keyword(s):  
Oxidation Resistance ◽  
Effective Temperature ◽  
Hot Isostatic Pressing ◽  
Ceramic Composites ◽  
Optical Micrograph ◽  
Different Temperatures ◽  
The Mean ◽  
Mean Time ◽  
Oxidation Behaviors

Fully dense samples of TiB2-TiCX and TiB2-TiCX/15SiC ceramic composites were fabricated by in-situ synthesis under hot isostatic pressing from TiH2, B4C and SiC powders. Their oxidized behaviors at different temperatures were tested. Optical micrograph studies and thermo-gravimetric analyses show that the highest effective temperature of oxidation resistance is 700°C for TiB2-TiCX, and 1100°C for TiB2-TiCX/15SiC. The weight gain of TiB2-TiCX/15SiC below 1100°C is quite low, and it rises up suddenly when the temperature reaches 1200°C. Thus, the highest effective temperature of oxidation resistance is 1100°C for TiB2-TiCX/15SiC. The oxidation dynamic curves of TiB2-TiCX/15SiC ceramics accord with the parabola’s law. The activation energy of TiB2-TiCx/15SiC (189.87kJ.mol-1) is higher than that of TiB2-TiCx (96.44kJ.mol-1). In the oxidation process of TiB2-TiCx/15SiC, TiB2 reacts with oxygen and generates TiO2 and B2O3 at first. A layer of whole homogeneous oxide film cannot be formed, in the mean time, the oxidation of TiC begins. When temperature goes up to 1000°C, TiC phase is totally oxidized. SiC is oxidized to SiO2 at about 900°C, Meanwhile, TiO2 forms denser film than B2O3, which grows and covers the surface of the material, and gives better property of oxidation resistance.

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