scholarly journals Spray-roof cooling system-analysis: cooling concept integration, Phase I. Passive and hybrid solar manufactured building project. Project status report No. 1

1981 ◽  
Author(s):  
J. Huffman ◽  
L. Lindsey ◽  
M. Snyder
Keyword(s):  
Phase I ◽  
System Analysis ◽  
Cooling System ◽  
Status Report ◽  
Building Project

A New Model Towards Thermal Mixing and Stratification in Passive Containment

2013 ◽  
Author(s):  
He Zhang ◽  
Fenglei Niu ◽  
Yu Yu ◽  
Peipei Chen
Keyword(s):  
Heat Transfer ◽  
System Analysis ◽  
Cooling System ◽  
Transfer Problem ◽  
Ambient Fluid ◽  
Simulation Code ◽  
Thermal Mixing ◽  
Lumped Parameter ◽  
Passive Safety System ◽  
Transfer Problems

Thermal mixing and stratification often appears in passive containment cooling system (PCCS), which is an important part of passive safety system. So, it is important to accurately predict the temperature and density distributions both for design optimization and accident analysis. However, current major reactor system analysis codes only provide lumped parameter models which can only get very approximate results. The traditional 2-D or 3-D CFD methods require very long simulation time, and it’s not easy to get result. This paper adopts a new simulation code, which can be used to calculate heat transfer problems in large enclosures. The new code simulates the ambient fluid and jets with different models. For the ambient fluid, it uses a one-dimensional model, which is based on the thermal stratification and derived from three conservation equations. While for different jets, the new code contains several jet models to fully simulate the different break types in containment. Now, the new code can only simulate rectangular enclosures, not the cylinder enclosure. So it is meaningful for us to modify the code to simulate the actual containment, then it can be applied to solve the heat transfer problem in PCCS accurately.

scholarly journals Design of the VISTA-ITL Test Facility for an Integral Type Reactor of SMART and a Post-Test Simulation of a SBLOCA Test

2014 ◽  
Vol 2014 ◽  
pp. 1-14 ◽  
Author(s):  
Hyun-Sik Park ◽  
Byung-Yeon Min ◽  
Youn-Gyu Jung ◽  
Yong-Cheol Shin ◽  
Yung-Joo Ko ◽  
...  
Keyword(s):  
System Analysis ◽  
Cooling System ◽  
Heat Removal ◽  
Test Facility ◽  
Integral Type ◽  
Type Reactor ◽  
Integral Effect ◽  
Post Test ◽  
Design Characteristics ◽  
And Performance

To validate the performance and safety of an integral type reactor of SMART, a thermal-hydraulic integral effect test facility, VISTA-ITL, is introduced with a discussion of its scientific design characteristics. The VISTA-ITL was used extensively to assess the safety and performance of the SMART design, especially for its passive safety system such as a passive residual heat removal system, and to validate various thermal-hydraulic analysis codes. The VISTA-ITL program includes several tests on the SBLOCA, CLOF, and PRHRS performances to support a verification of the SMART design and contribute to the SMART design licensing by providing proper test data for validating the system analysis codes. A typical scenario of SBLOCA was analyzed using the MARS-KS code to assess the thermal-hydraulic similarity between the SMART design and the VISTA-ITL facility, and a posttest simulation on a SBLOCA test for the shutdown cooling system line break has been performed with the MARS-KS code to assess its simulation capability for the SBLOCA scenario of the SMART design. The SBLOCA scenario in the SMART design was well reproduced using the VISTA-ITL facility, and the measured thermal-hydraulic data were properly simulated with the MARS-KS code.

Risk-Informed Analysis for Accident Tolerant Fuel in Pressurized Water Reactors

2020 ◽  
Author(s):  
Zhegang Ma ◽  
Carlo Parisi ◽  
Cliff Davis ◽  
Sai Zhang ◽  
Hongbin Zhang
Keyword(s):  
System Analysis ◽  
Hydrogen Generation ◽  
Cooling System ◽  
Pressurized Water ◽  
Water Reactor ◽  
Core Damage ◽  
Systems Research ◽  
Research Activities ◽  
Near Term ◽  
Accident Scenarios

Abstract This paper presents the research activities performed by Idaho National Laboratory (INL) for the Department of Energy (DOE) Light Water Reactor Sustainability (LWRS) Program, Risk-Informed System Analysis (RISA) Pathway, Enhanced Resilient Plant (ERP) Systems research, using the probabilistic risk assessment (PRA) tool SAPHIRE and the deterministic best estimate tool RELAP5-3D for risk-informed analysis. The ERP research supports DOE and industry initiatives by developing Accident Tolerant Fuel (ATF), the Diverse and Flexible Coping Strategy (FLEX), and passive cooling system designs to enhance existing reactors’ safety features (both active and passive) and to substantially reduce operating costs of nuclear power plants (NPPs) through risk-informed approaches to analyze the plant enhancements and their characterization. The risk-informed analysis used SAPHIRE and RELAP5-3D to evaluate the risk impacts from near-term ATF (FeCrAl and Chromium-coated clads) on a generic Westinghouse three-loop pressurized water reactor (PWR) under the following accident scenarios: station blackout (SBO), loss of feedwater (LOFW), steam generator tube rupture (SGTR), loss-of-coolant accidents (LOCAs), locked rotor transient, turbine trip transient, anticipated transient without scram (ATWS), and main steam line break (MSLB). The RELAP5-3D simulations included the time to core damage, time to 0.5 kilograms hydrogen generation, and total hydrogen generation. The simulation results show there are modest gains of coping time (delay of time to core damage) due to efficacy of the near-term ATF designs in various accident scenarios. The risk benefits on behalf of the core damage frequency (CDF) brought by the ATF designs would be small for most of the scenarios. However, results revealing much less hydrogen being produced at the time of core damage show a clear benefit in adopting ATFs.

Mathematical Model and Computational Program for Mercedes-Benz Diesel Engine Cooling System Analysis

1999 ◽  
Author(s):  
Antônio Carlos Canale ◽  
Carlos De Marqui ◽  
Gilberto Gomes Leal ◽  
Paulo Urbano Ávila
Keyword(s):  
Mathematical Model ◽  
Diesel Engine ◽  
System Analysis ◽  
Cooling System ◽  
Engine Cooling ◽  
Computational Program

scholarly journals Mechanisms Engineering Test Loop - Phase I Status Report - FY2018 (Update to FY2017 Report)

2018 ◽  
Author(s):  
D. Kultgen ◽  
C. Grandy ◽  
E. Kent ◽  
M. Weathered ◽  
D. Andujar ◽  
...  
Keyword(s):  
Phase I ◽  
Status Report ◽  
Test Loop

scholarly journals Impact of EGR control at in-cylinder pressure and ecological properties of CI off-road vehicle engine

2017 ◽  
Vol 170 (3) ◽  
pp. 88-95
Author(s):  
Andrzej BIENIEK ◽  
Jarosław MAMALA ◽  
Mariusz GRABA ◽  
Krystian HENNEK
Keyword(s):  
System Analysis ◽  
Cooling System ◽  
Exhaust Gas Recirculation ◽  
Exhaust Gas ◽  
Cylinder Pressure ◽  
Compression Ignition Engine ◽  
Road Vehicle ◽  
Exhaust Gases ◽  
Recirculation System ◽  
Gas Recirculation

An attempt has been made to clarify the effect of wide-ranging control of the exhaust gas recirculation system on the cylinder pressure and ecological engine performance. This publication contains the results of tests performed on the CI (compression ignition) engine of the off-road vehicle mounted on the test bench. The study was based on advanced EGR control with a proportional valve and a very efficient exhaust gases cooling system. Analysis of the test results is based on the cylinder pressure and the concentration of NOx and PM components at exhaust gases. The study included the influence of the exhaust gas recirculation system control on parameters such as differential pressure, MBF, and relative NOx and PM emissions. As demonstrated by the analysis conducted, the EGR valve control method and the exhaust gas cooling intensity significantly affect the cylinder pressure and its ecological performance.

scholarly journals Mechanisms Engineering Test Loop - Phase I Status Report - FY2015

2015 ◽  
Author(s):  
M. Hvasta ◽  
C. Grandy ◽  
D. Lisowski ◽  
A. Borowski
Keyword(s):  
Phase I ◽  
Status Report ◽  
Test Loop
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