ASME NTB 4 2021

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ASME NTB-4 – 2021 Background Information for Addressing Adequacy of Optimization of ASME BPVC Section III, Division 5 Rules for Nonmetallic Core Components

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ASME	2021

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Description

The purpose of this document is to provide background information on the scope, development, and verification of elevated-temperature design and construction rules as defined in the ASME Boiler and Pressure Vessel Code (“BPVC”), Section III Rules for Construction of Nuclear Facility Components, Division 5 High Temperature Reactors Subsection HH, Class A Nonmetallic Core Support Structures, Subpart A Graphite Materials, 2017 edition. The general requirements applicable to nonmetallic core components are discussed in BPVC Subsection HA General Requirements, Subpart B, Graphite Materials.

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PDF Pages	PDF Title
4	TABLE OF CONTENTS
5	FOREWORD
6	ABBREVIATIONS AND ACRONYMS
7	1 INTRODUCTION
8	Tables Table 1: Comparison of the Behavior of Steels and Nuclear Graphite
10	2 CODE APPROACH
12	Figures Figure 1: JAEA Methodology: (a) Design Stress Limit for Core Support Graphite and (b) Fracture Probability Density Function
13	Figure 2: Proposed ASME CE-3550-1 Service Categories and Stress Intensity Levels
14	Table 2: Safety Margins for Core Support Structures (In Tensile Loading) Figure 3: Illustration of Design Margin
15	Table 3: Design Allowable Probability of Failure Figure 4: Design Allowable Stresses Flowchart for SRC-1
16	Figure 5: Schematic of Simplified Assessment Methodology (CDF)
17	Figure 6: Schematic of Full Assessment Methodology (CDF) Figure 7: Weibull Probability Failure Prediction with the Full Assessment Method (PDF)
18	Figure 8: Typical Graphite Core Component Design Sequence
19	Figure 9: Typical Graphite Core Component Design Sequence (Continued)
20	3 GRAPHITE STRENGTH
22	4 CODE VERIFICATION
24	Table 4: Set of Verification Problems (VP)
26	Figure 10: Comparison of Predicted and Experimental Mean Failure Load for Verification Problems
27	Figure 11: Comparison of Experimental Mean Failure Load and Code-Allowable Loads for Verification Problems
28	5 SUMMARY
29	REFERENCES
32	APPENDIX A

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Standard Title	ASME NTB-4 – 2021 Background Information for Addressing Adequacy of Optimization of ASME BPVC Section III, Division 5 Rules for Nonmetallic Core Components
Published Code	ASME
Publication Date	2021

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