ITER G 74 MA 6 01-05-28 W0.4 ITER Structural Design Criteria for ITER General Section (SDC-G) ITER G 74 MA 6 01-05-28 W0.4 Structural Design Criteria for ITER, General Section Table of Contents G 1. Introduction ...............................................................................................................3 G 2. Basis for general approach .........................................................................................3 G 2.1. Scope .................................................................................................................3 G 2.2. Code selection....................................................................................................3 G 2.3. Design requirements and service conditions .......................................................5 G 2.4. Criteria levels.....................................................................................................5 G 2.5. Materials and design allowables .........................................................................6 G 3. Structural Design Code specification..........................................................................7 G 3.1. Magnet structures...............................................................................................7 G 3.1.1. Scope .........................................................................................................7 G 3.1.2. Basis for criteria - SDC-MC .......................................................................7 G 3.2. In-vessel components .........................................................................................8 G 3.2.1. Scope .........................................................................................................8 G 3.2.2. Basis for criteria - SDC-IC .........................................................................8 G 3.3. Vacuum vessel and ex-vessel components..........................................................9 G 3.3.1. Scope .........................................................................................................9 G 3.3.2. Basis for criteria - vacuum vessel and ex-vessel components ......................9 G 3.3.2.1. VV, Cryostat and other pressure vessels .................................................9 G 3.3.2.2. Piping ...................................................................................................10 G 3.3.2.3. Piping components: valves, fittings, flanges, and bolting .....................10 G 3.3.2.4. Pumps...................................................................................................10 G 3.3.2.5. Component supports .............................................................................11 G 3.3.2.6. Expansion joints (bellows)....................................................................11 G 3.3.2.7. Other components.................................................................................11 G 3.4. Buildings..........................................................................................................12 G 4. List of applicable criteria for each WBS (level 2).....................................................13 G 5. Stress report requirement .........................................................................................16 G 6. List of codes and standards ......................................................................................18 Structural Design Criteria Page 2 ITER G 74 MA 6 01-05-28 W0.4 G 1. Introduction The purpose of this document is to provide the guideline for structural design criteria used for various components of ITER. G 2. Basis for general approach G 2.1. Scope This document (SDC) contains the guide to the code selection that shall be used for structural analysis of different ITER components. The details of the analyses to be carried out are given in the listed codes and standards. The SDC does not contain procedures for quality assurance, non-destructive examination and in-service inspection. These issues should be addressed in the component design documents and in procurement specifications in accordance with codes selected. G 2.2. Code selection ITER structural design criteria fall into three categories based on the unique characteristics of the components. Each category has had its own development strategy, as follows: 1. Criteria for superconducting magnets and structures (SDC-MC1). Industry pressure vessel based codes do not apply owing to the unique characteristics of the structure, which include cryogenic temperatures and insulation as well as magnetic loads. ITER-specific criteria, SDC-MC, have been developed by the JCT and the Home Teams. 2. Criteria for in-vessel components (SDC-IC2,). Industry codes do not apply owing to unique materials, radiation damage to the materials leading to embrittlement, swelling, enhanced creep, and the multi-layered, inhomogeneous structure. ITER-specific criteria, SDC-IC, have been developed for structural analysis of in-vessel components. 3. Existing industrial codes are used for all other components. It was decided that US codes and standards would be adopted because the US standards are familiar to most participants and because they are the origin of and consistent with many other national standards. In particular, the ASME Boiler and Pressure Vessel code and related codes for piping, valves, and pumps are adopted as the standards for the project. Figure G 2.2-1 shows the diagram of Structural Design Criterion used for different ITER components. Either existing industrial codes or SDC-IC could be applied to the components with WBS 5.1-5.6 depending on the location of their portion (see G 3.2, G 3.3 and G 3.5). In some cases the structure, the material behavior and/or the loading might be too complicated to be evaluated using stress analysis alone. The provision for "design by experiment" is an acknowledgment that some aspects of the in-vessel components, such as 1 2 G 74 MA 11, Structural Design Criteria for Magnet Components (SDC-MC) G 74 MA 8, ITER Structural Design Criteria for In-vessel Components (SDC-IC) Structural Design Criteria Page 3 ITER G 74 MA 6 01-05-28 W0.4 material interfaces and nonlinear material behaviour, may be too complex to rely on stress analysis alone. Structural Design Criteria for ITER (SDC-G) G 74 MA 6 Structural Design Criteria for Magnet (SDC-MC) G 74 MA 11 Structural Design Criteria for In-vessel Components (SDC-IC) G 74 MA 8 Existing Industrial Standards (ASME, EJMA, etc.) 1.1 - Magnet 1.6 - Blanket System 1.5 - Vacuum Vessel 1.7 - Divertor 2.4 - Cryostat 2.6 - Cooling water 2.7 - Thermal shields 3.2 - Tritium plant and detritiation 3.4 - Cryoplant and cryodistribution 6.2- - Buildings, 6.4 Layout, Hot Cells, Waste Processing and Environmental Monitoring 6.5 - Liquid & Gas Distribution 5.1 - Ion Cyclotron Heating & Current Drive (ICH&CD) 5.2 - Electron Cyclotron Heating & Current Drive (ECH & CD) 5.3 - Neutral Beam Heating & Current Drive (NBH&CD) 5.4 - Lower Hybrid Heating & Current Drive (LHH&CD) 5.5 - Diagnostics 5.6 - Test Blanket Figure G 2.2-1. Schematic diagram of structural design codes application for the ITER components analysis. Structural Design Criteria Page 4 ITER G 74 MA 6 01-05-28 W0.4 G 2.3. Design requirements and service conditions ITER identifies four categories of event (or conditions): I - Operational, II - Likely, III - Unlikely, IV -Extremely unlikely. The different damage limits are specified depending on the category events and relevancy of the component to the safety class (SIC). Categories of the damage limits are given in DRG13. The designers shall specify the loading conditions depending on the event categories and damage limits for each of the component. General rules for the loading specification are given in Load Specification and Combination document (LS) 4. G 2.4. Criteria levels Criteria levels are aimed at preventing a specific degree of damage to the component in question. Four distinct criteria levels are given: A, B, C, and D, with the general objectives defined below: Criteria Level General objective A Negligible damage. All structures, systems, and components are functional. B Negligible damage. All structures, systems, and components are functional. Anticipated maintenance and minor adjustment might be required. Same service level as for Criteria Level A but with lower margin. C May be significant local distortion. May need to inspect, call for repair or replacement of faulty components. D May be large general distortion and investment loss. Repair may not be considered economic. Minimum safety functions shall be maintained. Service conditions or criteria levels are used in accordance with the codes identified in this document for each component (see G 3). 3 4 G A0 GDRD 2, Design Requirements and Guidelines Level 1 (DRG1) G A0 MA 1, Load Specification and Combination. Structural Design Criteria Page 5 ITER G 74 MA 6 01-05-28 W0.4 The analysis and terminology of different codes are not necessary identical (for example, ASME5 specifies Service Limits A, B, C and D). It is recommended to use terminology and analysis as prescribe in the code used for each component in accordance with G 3. G 2.5. Materials and design allowables The material properties used in the analysis (particularly allowable stresses) shall be defined by the code used for each component. If material grades or properties differ from those given in the code, justification documents shall be provided. 5 ASME Boiler and Pressure Vessel Code, 1995 Edition, Section III, Subsection NCA2142.4, The American Society of Mechanical Engineers, New York, 1995. Structural Design Criteria Page 6 ITER G 74 MA 6 01-05-28 W0.4 G 3. Structural Design Code specification G 3.1. Magnet structures G 3.1.1. Scope The ITER-specific Structural Design Criteria for Magnets Components (SDC-MC)1, are applicable to the superconducting coils and structures with WBS 1.1. These are conductor, insulation, coil cases and associated bracing structures, gravity supports, superconducting busbars supplying the coils and cryogenic pipelines. The criteria are also applicable to the keys and bolts used for the coil and support structures. G 3.1.2. Basis for criteria - SDC-MC The main purpose of the ITER magnet structural criteria is to establish a design code and component assessment methodology relevant to components operating in the range 4-77K and extended to room temperature under abnormal operating conditions. Existing codes generally exclude this low temperature range but the methodologies in these codes are in many cases applicable. The structures that this document refers to are magnets and their support structures. These will have a different stress system compared to plants consisting of pressure vessels, pipes and their supports, and use different types of materials. However various design methods reviewed for the so-called 'defect free' codes [ASME pressure vessel code 7, RCC-MR 6] as well as those dealing explicitly with defects in structures [R6, BS7910, API579] have been found in most cases to be compatible for use in the cryogenic temperature range when the relevant material properties are used. There are certain conditions with regards to the magnet components that this document will address. Operating largely without in-service inspection, the questions of safety factors, the operating loads, residual stresses, non-destructive examination sensitivity and reliability, and accuracy of material data relevant to the fracture and fatigue prediction procedures, become more significant at the design stage for the magnets than for conventional high temperature components. Structural Design Criteria Page 7 ITER G 74 MA 6 01-05-28 W0.4 G 3.2. In-vessel components G 3.2.1. Scope The ITER Structural Design Criteria for In-vessel Components (SDC-IC)2 is applicable to the following WBS elements: WBS 1.6 1.7 Title Blanket System Divertor In addition, the SDC-IC is applicable to in-vessel portions of other WBS elements. These WBS elements include the following table: WBS 1.8 5.1 5.2 5.3 5.4 5.5 5.6 G 3.2.2. Title Fuelling Ion Cyclotron Heating & Current Drive (ICH & CD) System Electron Cyclotron Heating & Current Drive (ECH & CD) System Neutral Beam Heating & Current Drive (NBH & CD) System Lower Hybrid Heating & Current Drive (LHH & CD) System Diagnostics Test Blankets Basis for criteria - SDC-IC SDC-IC development was undertaken as a collaboration among the four Home Teams of Europe, Japan, the Russian Federation, and the United States. The SDC-IC are based on the RCC-MR code6, as a convenient starting point, and extensive modifications have been provided to include unique structure of ITER components, useful features of other codes (in particular ASME), and national requirements to address the unique features of these components. 6 "Design and Construction Rules for Mechanical Components of FBR Nuclear Islands (RCC-MR), June 1985 Edition", Paris". Structural Design Criteria Page 8 ITER G 74 MA 6 01-05-28 W0.4 G 3.3. Vacuum vessel and ex-vessel components G 3.3.1. Scope The codes and standards listed in this section apply generally to ITER ex-vessel components other than the magnets and the buildings. These components are within the following elements: WBS 1.5 2.4 2.6 2.7 3.2 3.4 5.1 5.2 5.3 5.4 5.5 5.6 6.5 Title Vacuum Vessel (VV) Cryostat Cooling water Thermal shields Tritium plant and detritiation Cryoplant and cryodistribution Ion Cyclotron Heating & Current Drive (ICH & CD) System Electron Cyclotron Heating & Current Drive (ECH & CD) System Neutral Beam Heating & Current Drive (NBH & CD) System Lower Hybrid Heating & Current Drive (LHH & CD) System Diagnostics Test Blankets Liquid & Gas Distribution These include parts of components located in ex-vessel areas. (Some components are located inside the VV, for example, diagnostic components. SDC-IC should be applied for these parts located inside of VV.) Specific components are discussed below. G 3.3.2. Basis for criteria - vacuum vessel and ex-vessel components G 3.3.2.1. VV, Cryostat and other pressure vessels ASME Section VIII Division 2 7 shall be used for the vacuum vessel, cryostat and ex-vessel component design for loading conditions of the Category I and II (Design A condition, see ASME-VIII, Table AD-150.1). The ASME Section VIII identifies loading conditions as Design A, B, C or D. The Design A rules (ASME VIII div.2) shall be used for the ITER Category I and II events to maintain the DRG1 requirement on withstanding Category I and II loads without damage that requires inspection or repair. Design categories B, C and D of ASME VIII are not used for ITER. For the VV and cryostat, ITER identifies exceptional loading conditions (Categories III and IV, Unlikely and Extremely Unlikely Loadings) and permits local deformation providing the structural integrity and safety functions are maintained. The analysis of these unlikely events, Categories III and IV, is not explicitly addressed in ASME Section VIII. For these exceptional loading conditions (Cat. III and IV), the allowable stresses from ASME III Level 7 ASME Boiler and Pressure Vessel Code, 1995 Edition, Section VIII Division 2, Alternative rules. (Rules for Construction of Pressure Vessels), The American Society of Mechanical Engineers, New York, 1995. Structural Design Criteria Page 9 ITER G 74 MA 6 01-05-28 W0.4 C (Cat. III) and Level D (Cat. IV) 8 shall be used to demonstrate that the safety function is maintained. Application of these design rules should be restricted only to components inside and including the cryostat, not to all systems. Outside of the cryostat ASME Section VIII Division 2 shall be applied without exception. However, ASME Section VIII Division 2 does not contain buckling limits in the rules for design by analysis, and there is no explicit rule for vessels loaded by external pressure. The buckling rules of ASME Section III-NH shall be used for all components under external pressure or compressive load. G 3.3.2.2. Piping The selected piping code, ASME B31.39 is a section of the ASME Code for Pressure Piping, B31. The organization and provisions of this code are similar to ASME Section VIII, to which it is a companion. Service Category M is applicable to radioactive fluids, e.g., tritiated water, etc. This code also allows operation at cryogenic temperature. G 3.3.2.3. Piping components: valves, fittings, flanges, and bolting ASME B31.39 contains a Chapter IV, Standards for Piping Components, in which Table 326.1 lists standards for various components, including valves, fittings, flanges, and bolting. For the components listed in that table, the dimensional standards apply, and the pressure and temperature ratings of the components are accepted for pressure design in accordance with B31.3 paragraph 304.7.1. Unlisted components may also be used provided that they satisfy conditions in B31.3 paragraph 304.7.2. ASME B16.3410 is the generic standard for flanged and welded valves. It is accepted by its inclusion in B31.3 Table 326.1. If piping components not covered by B16.34 are needed, additional standards can be selected, from Table 326.1. G 3.3.2.4. Pumps ASME B31.39 excludes pumps from its scope. Two ANSI standards applicable to ITER and which are consistent with B31.3 are ASME B73.1M11 and ASME B73.2M12. ANSI standards are selected as the preferred path because of lower cost and consistency with other industry-standard codes. However, if specialty pumps are needed for which there are no 8 ASME Boiler and Pressure Vessel Code, 1995 Edition, Section III Division 1 (Rules for Construction of Nuclear Power Plant Components), Subsection NC, Class 2 Components, The American Society of Mechanical Engineers, New York, 1995. 9 "Chemical Plant and Petroleum Refinery Piping (ASME B31.3 - 1990)," The American Society of Mechanical Engineers, New York 10 "Valves - Flanged, Threaded, and Welding End (ASME B16.34 - 1988)," The American Society of Mechanical Engineers, New York 11 "Horizontal End Suction Centrifugal Pumps for Chemical Processes (ASME B73.1M - 1991)," The American Society of Mechanical Engineers, New York 12 "Vertical In-Line Centrifugal Pumps for Chemical Processes (ASME B73.2M - 1991)," The American Society of Mechanical Engineers, New York Structural Design Criteria Page 10 ITER G 74 MA 6 01-05-28 W0.4 ANSI standards, the rules of ASME Section III-NC could be used. Other standards may be selected and justified on a case-by-case basis. G 3.3.2.5. Component supports The code for the supports is ASME Section III-NF13, which includes rules for both shell and linear component, as well as criteria for the different loading categories. G 3.3.2.6. Expansion joints (bellows) ASME B31.3 shall be used for the design analysis of bellows. In particular, Appendix X of this standard contains the allowable stress and safety factors. The EJMA Standard can be used for the details of the design. G 3.3.2.7. Other components The industry standard codes in the same family as ASME Section VIII and ASME B31.3 may be used. Selected codes should be identified with justification of their applicability. 13 ASME Boiler and Pressure Vessel Code, 1995 Edition, Section III Division 1 (Rules for Construction of Nuclear Power Plant Components), Subsection NF, Component Supports, The American Society of Mechanical Engineers, New York, 1995. Structural Design Criteria Page 11 ITER G 74 MA 6 01-05-28 W0.4 G 3.4. Buildings The buildings (WBS 6.2-6.4) are divided into three categories. Appropriate codes given in Table G 3.4-1 or equivalent can be used for the design analysis. Table G G 3.4-1. Basic Structural Codes for Buildings Building category Construction code reinforced concrete - general purpose ACI 318M-89 14 reinforced concrete - nuclear safety related ACI 349-90 15 Steel frame Uniform Building Code 16 AISC steel construction criteria 17 and 18 14 Building Code Requirements for Reinforced Concrete (ACI 318M-89) (Revised 1992)," American Concrete Institute, Detroit, 1992. 15 Code Requirements for Nuclear Safety Related Concrete Structures (ACI 349-90)," American Concrete Institute, Detroit, 1990. 16 Uniform Building Code, 1994 Edition, International Conference of Building Officials, Whittier, California. 17 "AISC Manual of Steel Construction Ð Allowable Stress Design, Ninth Edition," American Institute of Steel Construction, Inc., Chicago, 1989. 18 "AISC Specification for Structural Steel Buildings - Allowable Stress Design and Plastic Design, June 1, 1989, with Commentary," American Institute of Steel Construction, Inc., Chicago, 1989. Structural Design Criteria Page 12 ITER G 74 MA 6 01-05-28 W0.4 G 4. List of applicable criteria for each WBS (level 2) Table 4.-1 contains a cross reference between the structural design criteria for each ITER component at WBS level 2. Structural design criteria apply only to engineered structures. Some components include only purchased equipment, in which case "Not Applicable" (N/A) is noted. Table G 4.-1. List of applicable criteria for each WBS element WBS No. 1.1 Title Selected Criteria Magnet Structural Design Criteria, Vol.2, Magnet (SDC-MC) 1.5 Vacuum Vessel 1.6 Blanket System ASME Section VIII Div. 2 ASME Section III-NC for Cat III and IV Events Structural Design Criteria, Vol.1, In-Vessel Components (SDC-IC) 1.7 Divertor Structural Design Criteria, Vol.1, In-Vessel Components (SDC-IC) 2.3 No specific criteria are identified 2.4 Remote Handling (RH) Equipment Cryostat 2.6 Cooling Water 2.7 Thermal Shields 3.1 Vacuum Pumping & Fueling 3.2 Tritium Plant & Detritiation 3.4 4.1 Cryoplant and Cryodistribution Pulsed & Steady State Power Supplies Structural Design Criteria vessel: ASME Section VIII Div. 2 piping: ASME B31.3 supports: ASME Section III-NF bellows: ASME B31.3, Appendix X/EJMA ASME Section III-NC for Cat III and IV Events vessels: ASME Section VIII Div. 2 * piping ASME B 31.3, Category M pumps ASME B73.1M / B73.2M valves ASME B16.34 supports ASME Section III-NF bellows: ASME B31.3, Appendix X/EJMA ASME Section III-NC for Cat III and IV Events ** ASME Section VIII Div. 2 ASME Section III-NC for Cat III and IV Events vessels: ASME Section VIII Div. 2 piping: ASME B31.3 vessels: ASME Section VIII Div. 2 * piping pumps valves supports bellows: vessels: piping pumps valves supports bellows: N/A ASME B 31.3, Category M ASME B73.1M / B73.2M ASME B16.34 ASME Section III-NF ASME B31.3, Appendix X/EJMA ASME Section VIII Div. 2 * ASME B 31.3, Category M ASME B73.1M / B73.2M ASME B16.34 ASME Section III-NF ASME B31.3, Appendix X/EJMA Page 13 ITER 5.1 5.2 5.3 5.4 5.5 G 74 MA 6 01-05-28 W0.4 Ion Cyclotron Heating & Current Drive (ICH & CD) System Electron Cyclotron Heating & Current Drive (ECH & CD) System Neutral Beam Heating & Current Drive (NBH & CD) System Lower Hybrid Heating & Current Drive (LHH & CD) System Diagnostics Irradiated items: Structural Design Criteria, Vol.1, In-Vessel Components (SDC-IC) Unirradiated items: vessels: ASME Section VIII Div. 2 * piping: ASME B31.3 supports: ASME Section III-NF bellows: ASME B31.3, Appendix X/EJMA ASME Section III-NC for Cat III and IV Events ** Irradiated items: Structural Design Criteria, Vol.1, In-Vessel Components (SDC-IC) Unirradiated items: vessels: ASME Section VIII Div. 2 * piping: ASME B31.3 supports: ASME Section III-NF bellows: ASME B31.3, Appendix X/EJMA ASME Section III-NC for Cat III and IV Events ** Irradiated items: Structural Design Criteria, Vol.1, In-Vessel Components (SDC-IC) Unirradiated items: vessels: ASME Section VIII Div. 2 * piping: ASME B31.3 supports: ASME Section III-NF bellows: ASME B31.3, Appendix X/EJMA ASME Section III-NC for Cat III and IV Events ** Irradiated items: Structural Design Criteria, Vol.1, In-Vessel Components (SDC-IC) Unirradiated items: vessels: ASME Section VIII Div. 2 * piping: ASME B31.3 supports: ASME Section III-NF bellows: ASME B31.3, Appendix X/EJMA ASME Section III-NC for Cat III and IV Events ** Irradiated items: Structural Design Criteria, Vol.1, In-Vessel Components (SDC-IC) Unirradiated items: vessels: ASME Section VIII Div. 2 * piping: ASME B31.3 supports: ASME Section III-NF bellows: ASME B31.3, Appendix X/EJMA ASME Section III-NC for Cat III and IV Events ** Structural Design Criteria, Vol.1, In-Vessel Components (SDC-IC) 5.6 Test Blankets 6.2 Buildings & Layout concrete (normal): concrete (safety related): steel frame: 6.3 Hot cells & Waste Processing Radiological and Environmental Monitoring Local building code 6.4 Structural Design Criteria ACI 318 ACI 349 UBC, AISC Local building code Page 14 ITER 6.5 G 74 MA 6 01-05-28 W0.4 Liquid & Gas Distribution vessels: piping: supports: bellows: ASME Section VIII Div. 2 * ASME B31.3 ASME Section III-NF ASME B31.3, Appendix X/EJMA Notes: * Section VIII Div. 2 is selected for pressure vessels. However, it is possible that this could be changed to Section VIII Div. 1 for certain pressure vessels if analysis shows Div. 1 to be warranted. ** Application of these design rules should be restricted to components inside and including the cryostat, if required. Structural Design Criteria Page 15 ITER G 74 MA 6 01-05-28 W0.4 G 5. Stress report requirement Calculations made to check the rules contained in the SDC shall be documented in design calculation notes, memos and, where necessary, a summary report. The design documents shall include a stress report for all the components designed in accordance with the rules of the SDC. The report shall demonstrate that the criteria are satisfied for all loadings specified in the component data file. They shall also demonstrate that any additional design requirements contained in the component data file are met. The typical organization of the stress report is as follows: Introduction The introduction defines the component concerned, its structure, its limits, the design conditions, and the design and construction class. Basic data Description of the geometry of the structures, interface information (boundary conditions), and loadings, with explanatory diagrams where possible. Materials The reference to the materials data shall be provided. Specified criteria Summary of the rules and criteria required by the component data file and to be used in this notice. Calculations This chiefly comprises: - Justification of the models used for the geometry and loadings. - Description and justification of the calculation methods used. In this latter case, the reference used to check the analytical and/or experimental solutions in the field of use envisaged will be indicated. - Calculated results. Analysis of the results This chiefly comprises: - Transformation of the calculation results into the form needed to compare them with the acceptance criteria. In particular, this requires analysis of the classification of stresses (primary, local primary, secondary, etc.) and the calculation of equivalent stress intensities . - Assessment of stress (or strain) concentration factors and justification. - Comparison of stresses, strains, deformations, and use-fractions with applicable limits. - Assessment of uncertainties, accuracy. Structural Design Criteria Page 16 ITER G 74 MA 6 01-05-28 W0.4 - Assessment of validity of results, justification of models used and simplifications made. - Where applicable, evaluation of the behaviour of the structure with regard to collapse modes. Conclusions Summary of conclusions from analysis. References to either ITER documents or codes and standards accepted by ITER are possible to give in the report, if detailed descriptions of analyses, formulas, materials database, etc. are given in the reference documents. Structural Design Criteria Page 17 ITER G 74 MA 6 01-05-28 W0.4 G 6. List of codes and standards - G A0 GDRD 2, Design Requirements and Guidelines, Level1 (DRG1) - G A0 MA 1, Load Specification and Combination. - G 74 MA 8, Structural Design Criteria for In-vessel Components (SDC-IC) - Structural Design Criteria for Magnet (SDC-MC), revision 06.12.2000 - Design and Construction Rules for Mechanical Components of FBR Nuclear Islands (RCC-MR), June 1985 Edition, Paris. - ASME Boiler and Pressure Vessel Code, 1995 Edition, Section VIII Division 2, Alternative rules. (Rules for Construction of Pressure Vessels), The American Society of Mechanical Engineers, New York, 1995. - ASME Boiler and Pressure Vessel Code, 1995 Edition, Section III Division 1 (Rules for Construction of Nuclear Power Plant Components), Subsection NC, Class 2 Components, The American Society of Mechanical Engineers, New York, 1995. - ASME Boiler and Pressure Vessel Code, 1995 Edition, Section III Division 1 (Rules for Construction of Nuclear Power Plant Components), Subsection NF, Component Supports, The American Society of Mechanical Engineers, New York, 1995. - Chemical Plant and Petroleum Refinery Piping (ASME B31.3 - 1990), The American Society of Mechanical Engineers, New York - Valves - Flanged, Threaded, and Welding End (ASME B16.34 - 1988), The American Society of Mechanical Engineers, New York - Horizontal End Suction Centrifugal Pumps for Chemical Processes (ASME B73.1M - 1991)," The American Society of Mechanical Engineers, New York. - Vertical In-Line Centrifugal Pumps for Chemical Processes (ASME B73.2M 1991)," The American Society of Mechanical Engineers, New York. - Building Code Requirements for Reinforced Concrete (ACI 318M-89) (Revised 1992)," American Concrete Institute, Detroit, 1992. - Code Requirements for Nuclear Safety Related Concrete Structures (ACI 34990)," American Concrete Institute, Detroit, 1990. - Uniform Building Code, 1994 Edition, International Conference of Building Officials, Whittier, California. - AISC Manual of Steel Construction Ð Allowable Stress Design, Ninth Edition, American Institute of Steel Construction, Inc., Chicago, 1989. - AISC Specification for Structural Steel Buildings - Allowable Stress Design and Plastic Design, June 1, 1989, with Commentary, American Institute of Steel Construction, Inc., Chicago, 1989. 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