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A Review & Assessment of Current Operating Conditions Allowable Stresses in ASME Section III Subsection NH

Description: The current operating condition allowable stresses provided in ASME Section III, Subsection NH were reviewed for consistency with the criteria used to establish the stress allowables and with the allowable stresses provided in ASME Section II, Part D. It was found that the S{sub o} values in ASME III-NH were consistent with the S values in ASME IID for the five materials of interest. However, it was found that 0.80 S{sub r} was less than S{sub o} for some temperatures for four of the materials.… more
Date: December 14, 2009
Creator: Swindeman, R. W.
Partner: UNT Libraries Government Documents Department
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Update and Improve Subsection NH –– Alternative Simplified Creep-Fatigue Design Methods

Description: This report described the results of investigation on Task 10 of DOE/ASME Materials NGNP/Generation IV Project based on a contract between ASME Standards Technology, LLC (ASME ST-LLC) and Japan Atomic Energy Agency (JAEA). Task 10 is to Update and Improve Subsection NH -- Alternative Simplified Creep-Fatigue Design Methods. Five newly proposed promising creep-fatigue evaluation methods were investigated. Those are (1) modified ductility exhaustion method, (2) strain range separation method, (3)… more
Date: October 26, 2009
Creator: Asayama, Tai
Partner: UNT Libraries Government Documents Department
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Update and Improve Subsection NH - Simplified Elastic and Inelastic Design Analysis Methods

Description: The objective of this subtask is to develop a template for the 'Ideal' high temperature design Code, in which individual topics can be identified and worked on separately in order to provide the detail necessary to comprise a comprehensive Code. Like all ideals, this one may not be attainable as a practical matter. The purpose is to set a goal for what is believed the 'Ideal' design Code should address, recognizing that some elements are not mutually exclusive and that the same objectives can b… more
Date: June 27, 2009
Creator: Abou-Hanna, Jeries J.; Marriott, Douglas L. & McGreevy, Timothy E.
Partner: UNT Libraries Government Documents Department
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New Materials for NGNP/Gen IV

Description: The bounding conditions were briefly summarized for the Next Generation Nuclear Plant (NGNP) that is the leading candidate in the Department of Energy Generation IV reactor program. Metallic materials essential to the successful development and proof of concept for the NGNP were identified. The literature bearing on the materials technology for high-temperature gas-cooled reactors was reviewed with emphasis on the needs identified for the NGNP. Several materials were identified for a more thoro… more
Date: December 18, 2009
Creator: Swindeman, Robert W. & Marriott, Douglas L.
Partner: UNT Libraries Government Documents Department
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Regulatory Safety Issues in the Structural Design Criteria of ASME Section III Subsection NH and for Very High Temperatures for VHTR & GEN IV

Description: The objective of this task is to identify issues relevant to ASME Section III, Subsection NH [1], and related Code Cases that must be resolved for licensing purposes for VHTGRs (Very High Temperature Gas Reactor concepts such as those of PBMR, Areva, and GA); and to identify the material models, design criteria, and analysis methods that need to be added to the ASME Code to cover the unresolved safety issues. Subsection NH was originally developed to provide structural design criteria and limit… more
Date: May 7, 2007
Creator: O’Donnell, William J. & Griffin, Donald S.
Partner: UNT Libraries Government Documents Department
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Review of Current Experience on Intermediate Heat Exchanger (IHX) and A Recommended Code Approach

Description: The purpose of the ASME/DOE Gen IV Task 7 Part I is to review the current experience on various high temperature reactor intermediate heat exchanger (IHX) concepts. There are several different IHX concepts that could be envisioned for HTR/VHTR applications in a range of temperature from 850C to 950C. The concepts that will be primarily discussed herein are: (1) Tubular Helical Coil Heat Exchanger (THCHE); (2) Plate-Stamped Heat Exchanger (PSHE); (3) Plate-Fin Heat Exchanger (PFHE); and (4) Plat… more
Date: February 2, 2010
Creator: Spencer, Duane & McCoy, Kevin
Partner: UNT Libraries Government Documents Department
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Creep and Creep-Fatigue Crack Growth at Structural Discontinuities and Welds

Description: The subsection ASME NH high temperature design procedure does not admit crack-like defects into the structural components. The US NRC identified the lack of treatment of crack growth within NH as a limitation of the code and thus this effort was undertaken. This effort is broken into two parts. Part 1, summarized here, involved examining all high temperature creep-fatigue crack growth codes being used today and from these, the task objective was to choose a methodology that is appropriate for p… more
Date: January 27, 2010
Creator: Brust, F. W.; Wilkowski, G. M.; Krishnaswamy, P. & Wichman, Keith
Partner: UNT Libraries Government Documents Department
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