Modelling and control for eliminating flux oscillations in generation IV high temperature gas cooled reactor

2016 ◽  
Vol 52 (3) ◽  
pp. 190-192 ◽  
Author(s):  
K.D. Badgujar ◽  
P.G. Park
Keyword(s):  
High Temperature ◽  
And Control ◽  
High Temperature Gas

scholarly journals Development of High Temperature Gas Sensor Technology

1997 ◽  
Author(s):  
Gary W. Hunter ◽  
Liang-Yu Chen ◽  
Philip G. Neudeck ◽  
Dak Knight ◽  
C. C. Liu ◽  
...  
Keyword(s):  
High Temperature ◽  
Materials Science ◽  
Point Contact ◽  
Sensor Technology ◽  
Monitoring And Control ◽  
Engine Emissions ◽  
Stage Of Development ◽  
Contact Sensor ◽  
And Control ◽  
High Temperature Gas

The measurement of engine emissions is important for their monitoring and control. However, the ability to measure these emissions in-situ is limited. We are developing a family of high temperature gas sensors which are intended to operate in harsh environments such as those in an engine. The development of these sensors is based on progress in two types of technology: 1) The development of SiC-based semiconductor technology. 2) Improvements in micromachining and microfabricarion technology. These technologies are being used to develop point-contact sensors to measure gases which are important in emission control especially hydrogen, hydrocarbons, nitrogen oxides, and oxygen. The purpose of this paper is to discuss the development of this point-contact sensor technology. The detection of each type of gas involves its own challenges in the fields of materials science and fabrication technology. Of particular importance is sensor sensitivity, selectivity, and stability in long-term, high temperature operation. An overview is presented of each sensor type with an evaluation of its stage of development. It is concluded that this technology has significant potential for use in engine applications but further development is necessary.

A Personal Computer-Based Simulation-and-Control-Integrated Platform for 10-MW High-Temperature Gas-Cooled Reactor

2004 ◽  
Vol 145 (2) ◽  
pp. 189-203 ◽  
Author(s):  
Lei Shi ◽  
Haibin Liu ◽  
Xiaojing Yang ◽  
Zuying Gao ◽  
Yujie Dong ◽  
...  
Keyword(s):  
High Temperature ◽  
Personal Computer ◽  
Integrated Platform ◽  
Computer Based ◽  
Simulation And Control ◽  
And Control ◽  
High Temperature Gas

Guidance for Developing Fuel Design Limit of High Temperature Gas-Cooled Reactor

2020 ◽  
Author(s):  
Hiroyuki Sato ◽  
Takeshi Aoki ◽  
Hirofumi Ohashi
Keyword(s):  
High Temperature ◽  
Development Process ◽  
Evaluation Criteria ◽  
Research Association ◽  
Safety Requirements ◽  
Fuel Design ◽  
Physical Barriers ◽  
Test Reactor ◽  
And Control ◽  
High Temperature Gas

Abstract The present study aims to propose a guidance that facilitates to determine fuel design limits of commercial HTGR on the basis of licensing experience through the high temperature engineering test reactor (HTTR) construction. The guidance consists of a set of figure of merits (FOMs) and a process to determine their evaluation criteria. The FOMs are firstly identified to satisfy safety requirements and a basic concept of safety guides established in a special committee under the Atomic Energy Society of Japan with the support of the Research Association of High Temperature Gas Cooled Reactor Plant. The development process for the evaluation criteria takes into account not only the top-level regulatory criteria but also design dependent constraints including the performance of fission product containment in physical barriers other than fuel, fuel qualification criteria, design specifications of an instrumentation and control system. As a result, a comprehensive and transparent procedure for designers of prismatic-type commercial HTGR has been developed. This paper provides details on the development procedure for fuel design limit. methods to derive the limits are also presented.

Magnetic Field Analysis of Active Magnetic Bearings for Helium Blower of HTR-PM

2013 ◽  
Author(s):  
Leilei Guo ◽  
Guojun Yang ◽  
Zhengang Shi ◽  
Xingnan Liu ◽  
Suyuan Yu
Keyword(s):  
Magnetic Field ◽  
High Temperature ◽  
Magnetic Bearings ◽  
Field Analysis ◽  
Active Magnetic Bearings ◽  
Rotating Speed ◽  
Magnetic Field Analysis ◽  
Environment Temperature ◽  
And Control ◽  
High Temperature Gas

High-temperature gas-cooled reactor-pebble bed module (HTR-PM) of China, based on the technology and experience of the 10MW high-temperature gas-cooled reactor (HTR-10), is currently in the design and experiment phase. The helium blower is the key equipment in the first loop of the HTR-PM. Active magnetic bearings (AMBs) are replacing ordinary bearings as the perfect sustaining assembly for the helium blower because they have several advantages: they are free of contact, do not require lubrication, are not subject to the contamination of wear, have endurance, and control performance very well. So the AMB is the appropriate supporting assembly. The rotor’s length of the helium blower is about 3.3 m, its weight is about 4000 kg and the rotating speed is 4000 r/min. The maximal radial load of the upper AMB or the lower AMB is about 1950kg, and the maximal axial load is about 4500kg. So the axial and radial AMBs must have enough carrying capacity to support the rotor. It is difficult to design the AMB in limited space. Many factors may restrict the AMB design, for example, clearance between AMB and rotor, electric current, and environment temperature, etc. In this paper, design of magnetic field will be analyzed. Heat loss of AMB will be discussed. The designing scheme of magnetic field will offer the important theoretical base for AMB design of the helium blower of HTR-PM.

Status of the Third NGNP Graphite Irradiation AGC-3 in the Advanced Test Reactor

2013 ◽  
Author(s):  
S. Blaine Grover ◽  
David A. Petti ◽  
Michael E. Davenport
Keyword(s):  
High Temperature ◽  
Compressive Load ◽  
The United States ◽  
Performance Data ◽  
United States Department ◽  
The Third ◽  
Test Reactor ◽  
Irradiation Performance ◽  
And Control ◽  
High Temperature Gas

The United States Department of Energy’s Next Generation Nuclear Plant (NGNP) Program will irradiate up to six nuclear graphite creep experiments in the Advanced Test Reactor (ATR) located at the Idaho National Laboratory (INL). The graphite experiments are being irradiated over an approximate eight year period to support development of a graphite irradiation performance data base on the new nuclear grade graphites now available for use in high temperature gas reactors. The goals of the irradiation experiments are to obtain irradiation performance data, including irradiation creep, at different temperatures and loading conditions to support design of the NGNP Very High Temperature Gas Reactor (VHTR), as well as other future gas reactors. The experiments each consist of a single capsule that contain six stacks of graphite specimens, with half of the graphite specimens in each stack under a compressive load, while the other half of the specimens are not be subjected to a compressive load during irradiation. The six stacks have differing compressive loads applied to the top half of diametrically opposite pairs of specimen stacks. A seventh specimen stack in the center of the capsule does not have a compressive load. The specimens are being irradiated in an inert sweep gas atmosphere with on-line temperature and compressive load monitoring and control. There are also samples taken of the sweep gas effluent to measure any oxidation or off-gassing of the specimens that may occur during initial start-up of the experiment. The first experiment, AGC-1, started its irradiation in September 2009, and the irradiation was completed in January 2011. The second experiment, AGC-2, started its irradiation in April 2011 and completed its irradiation in May 2012 [1]. The third experiment, AGC-3, is scheduled to start its irradiation in late November 2012 and complete in the late summer to fall of 2014. This paper will briefly discuss the design of the AGC-3 experiment and control systems, and present the irradiation results to date.

An Environmental Wet Cell For High Voltage Electron Microscopy

1973 ◽  
Vol 31 ◽  
pp. 18-19
Author(s):  
N.J. Tighe ◽  
H.M. Flower ◽  
P.R. Swann
Keyword(s):  
Electron Microscopy ◽  
High Temperature ◽  
Image Quality ◽  
Inelastic Scattering ◽  
High Voltage ◽  
High Voltage Electron Microscopy ◽  
Voltage Electron ◽  
Environmental Cell ◽  
Water Saturated ◽  
High Temperature Gas

A differentially pumped environmental cell has been developed for use in the AEI EM7 million volt microscope. In the initial version the column of gas traversed by the beam was 5.5mm. This permited inclusion of a tilting hot stage in the cell for investigating high temperature gas-specimen reactions. In order to examine specimens in the wet state it was found that a pressure of approximately 400 torr of water saturated helium was needed around the specimen to prevent dehydration. Inelastic scattering by the water resulted in a sharp loss of image quality. Therefore a modified cell with an ‘airgap’ of only 1.5mm has been constructed. The shorter electron path through the gas permits examination of specimens at the necessary pressure of moist helium; the specimen can still be tilted about the side entry rod axis by ±7°C to obtain stereopairs.

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