scholarly journals A thermal structural analysis tool for RPV lower head behavior during severe accidents with core melt

2018 ◽  
Vol 4 (0) ◽  
pp. 18-00038-18-00038 ◽  
Author(s):  
Hiroshi MADOKORO ◽  
Alexei MIASSOEDOV ◽  
Thomas SCHULENBERG
Keyword(s):  
Structural Analysis ◽  
Analysis Tool ◽  
Severe Accidents ◽  
Lower Head

Coupling of a Reactor Analysis Code and a Lower Head Thermal Analysis Solver

2019 ◽  
Vol 5 (1) ◽  
Author(s):  
Hiroshi Madokoro ◽  
Alexei Miassoedov ◽  
Thomas Schulenberg
Keyword(s):  
Structural Analysis ◽  
Message Passing ◽  
Message Passing Interface ◽  
Severe Accident ◽  
Coupled Analysis ◽  
Accident Analysis ◽  
Analysis Tool ◽  
Lower Head ◽  
Calculation Results ◽  
Reactor Pressure

Due to the recent high interest on in-vessel melt retention (IVR), development of detailed thermal and structural analysis tool, which can be used in a core-melt severe accident, is inevitable. Although RELAP/SCDAPSIM is a reactor analysis code, originally developed for U.S. NRC, which is still widely used for severe accident analysis, the modeling of the lower head is rather simple, considering only a homogeneous pool. PECM/S, a thermal structural analysis solver for the reactor pressure vessel (RPV) lower head, has a capability of predicting molten pool heat transfer as well as detailed mechanical behavior including creep, plasticity, and material damage. The boundary condition, however, needs to be given manually and thus the application of the stand-alone PECM/S to reactor analyses is limited. By coupling these codes, the strength of both codes can be fully utilized. Coupled analysis is realized through a message passing interface, OpenMPI. The validation simulations have been performed using LIVE test series and the calculation results are compared not only with the measured values but also with the results of stand-alone RELAP/SCDAPSIM simulations.

Structural Analysis of the Shallow-Buried Station by Using Load Structure Method

2012 ◽  
Vol 204-208 ◽  
pp. 881-884
Author(s):  
Yong Shuai Cao ◽  
Yong Sheng Zhang
Keyword(s):  
Structural Analysis ◽  
Engineering Design ◽  
Simulation Analysis ◽  
Reference Value ◽  
Subway Station ◽  
Analysis Tool ◽  
Main Structure ◽  
Its Analysis ◽  
Practical Engineering ◽  
The Common

Aiming at a practical engineering case of a subway station, the paper uses the common software ANSYS as its analysis tool and uses the load structure method to do simulation analysis on the station's main structure. The results indicate that this method is practicable and has certain reference value for engineering design.

Thermal and Structural Analysis of Reactor Vessel Lower Head Considering Core Meltdown Accident

2018 ◽  
Author(s):  
Juan Luo ◽  
Jiacheng Luo ◽  
Lei Sun ◽  
Peng Tang
Keyword(s):  
Structural Analysis ◽  
Creep Deformation ◽  
Structural Integrity ◽  
Pressure Vessels ◽  
Reactor Vessel ◽  
Severe Accident ◽  
Creep Failure ◽  
The Core ◽  
Lower Head ◽  
Core Meltdown

In the core meltdown severe accident, in-vessel retention (IVR) of molten core debris by external reactor vessel cooling (ERVC) is an important mitigation strategy. During the IVR strategy, the core debris forming a melt pool in the reactor pressure vessel (RPV) lower head (LH) will produce extremely high thermal and mechanical loadings to the RPV, which may cause the failure of RPV due to over-deformation of plasticity or creep. Therefore, it is necessary to study the thermomechanical behavior of the reactor vessel LH during IVR condition. In this paper, under the assumption of IVR-ERVC, the thermal and structural analysis for the RPV lower head is completed by finite element method. The temperature field and stress field of the RPV wall, and the plastic deformation and creep deformation of the lower head are obtained by calculation. Plasticity and creep failure analysis is conducted as well. Results show that under the assumed conditions, the head will not fail due to excessive creep deformation within 200 hours. The results can provide basis for structural integrity analysis of pressure vessels.

scholarly journals DNAproDB: an expanded database and web-based tool for structural analysis of DNA–protein complexes

2019 ◽  
Author(s):  
Jared M Sagendorf ◽  
Nicholas Markarian ◽  
Helen M Berman ◽  
Remo Rohs
Keyword(s):  
Structural Analysis ◽  
Protein Complexes ◽  
Structural Data ◽  
Data Bank ◽  
Structural Features ◽  
Analysis Tool ◽  
Web Based ◽  
Initial Release ◽  
Data Files ◽  
User Friendly

Abstract DNAproDB (https://dnaprodb.usc.edu) is a web-based database and structural analysis tool that offers a combination of data visualization, data processing and search functionality that improves the speed and ease with which researchers can analyze, access and visualize structural data of DNA–protein complexes. In this paper, we report significant improvements made to DNAproDB since its initial release. DNAproDB now supports any DNA secondary structure from typical B-form DNA to single-stranded DNA to G-quadruplexes. We have updated the structure of our data files to support complex DNA conformations, multiple DNA–protein complexes within a DNAproDB entry and model indexing for analysis of ensemble data. Support for chemically modified residues and nucleotides has been significantly improved along with the addition of new structural features, improved structural moiety assignment and use of more sequence-based annotations. We have redesigned our report pages and search forms to support these enhancements, and the DNAproDB website has been improved to be more responsive and user-friendly. DNAproDB is now integrated with the Nucleic Acid Database, and we have increased our coverage of available Protein Data Bank entries. Our database now contains 95% of all available DNA–protein complexes, making our tools for analysis of these structures accessible to a broad community.

Analyses on Engineering Mechanics of Robotic Arm for Sorting Multi-Materials

2020 ◽  
pp. 176-208
Author(s):  
Zol Bahri Razali ◽  
Mohamed Mydin M. Abdul Kader ◽  
Mohd Hisam Daud ◽  
Khor Wen Hwooi Stephen
Keyword(s):  
Structural Analysis ◽  
Static Analysis ◽  
Critical Stress ◽  
Base Plate ◽  
Maximum Load ◽  
Robotic Arm ◽  
Analysis Tool ◽  
Motor Shaft ◽  
Affected Area ◽  
Engineering Mechanics

The study involves static analysis on the developed robotic arm. Increasing loads are applied to the robotic arm to determine the maximum load that it can hold. Firstly, the robotic arm model is created using CATIA. Then, it is analyzed using the generative structural analysis tool in the same software. Increasing loads are applied to the end of the robotic arm until significant deformation occurs. The same procedure is done for modified designs in the analysis software. The results considered include displacement and stress. Based on the results, the critical stress areas are near to the rotating joints of the robotic arm, the back of the gripper and the sharp edge of the second arm. Proposed modifications include increasing the servo motor shaft radius and edge filleting the affected area, increasing the thickness and reducing the length of the gripper base plate, and implementing a new design for the second arm.

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