ASME NTB-2 pdf free download

ASME NTB-2-2019 pdf free download.Background Information for Addressing Adequacy or Optimization of ASME BPVC Section I, Division 5 Rules for Metallic Components.
The need for more specific information on the component loading history as required for the rules of Appendix HBB-T is discussed in Section 17.4.4.3.9.6. Design Specifications and Load Histograms. Also identified are some of the additional considerations that must be identified in the Design Specification.
HBB-3138 Elastic Follow-up
Section 17.4.4.3.9.3, conviderarion for Elastic Follow-up, provides a fairly extensive discussion of what constitutes elastic follow-up, where it is considered in the current rules, and guidance on how to implement that consideration. Also addressed is the background for the provisions for pressure-induced discontinuity stresses in the HBB-T-1330 rules for strain limits and the HBB-T-1430 rules for creep-fatigue damage evaluation.
IIBB-3200 Design by Analysis
Some of the critical features of elevated temperature material behavior and how they differ from material response below the creep regime are discussed in Section 17.4.4.3.2, Ele•ated Temperature Material Behai’ior. These critical features apply to both load-controlled and displacement-controlled loading. How the limits on loading and material response at elevated temperature were separated Into load-controlled and displacement-controlled quantities is discussed in Section 17.4.4.3.4, Stress and Strain Categories and controlled Quantities. The load-controlled quantities are covered in HBII-3000 and the displacement- controlled quantities in HBB Appendix T. Also shown is the flow diagram for elevated temperature analysis, Figure HBB-3221-l, that replaces the hopper diagrams used to illustrate the sequential application of the design rules below the creep regime. The various regimes of creep behavior are described.
AS%W NTB-2-2019: BACKCROUNI) INFORMATION FoR AI)I)RF.SSING ALWQUACI OROPTIMI7MION OF ASII BI’VC SECI1ON III. 1)1 VISION 5 RULES FOR METALliC COMP()NI.XFS
Representations of creep data are also illustrated, including the effect of hold times at constant strain on cyclic life. This is a broad-brush treatment that sets the stage for further detailed discussions.
HBB-3214.2 Inelastic Analysis
Inelastic analysis may be required to satisfy strain limits and creep-fatigue damage evaluation; however, only general guidance is presented in HBB-32 14.2. however, specitic guidance was provided for early liquid metal fast breeder reactor (“LMFBR”) programs. Section 17.4.4.3.9.4. Inelastic Analysis Methods. provides an overview of that guidance. More details on the early guidance are provided in Welding Research Council, Inc. (“WRC”) Bulletin 365, Volume Ill- Inelastic Analwis. July 1991, as discussed in Section 3.3 of this background document.
HBB-3220 l)esign Rules for Load Controlled Stresses in Structures Other than Bolts IlBB-3221 General Requirements
Allowable stress criteria for Design Limits are discussed in Section 17.4.4.3.5.1 and criteria for Service Limits in Section I 7.4.4.3.5.2. As discussed above, how the limits on loading and material response at elevated temperature are classified into load-controlled and displacement-controlled quantities is discussed in Section 17.4.4.3.4, Stress and Strain categories and C’ont rolled Quantities. Also shown in Section 17.4.4.3.4 is the flow diagram for elevated-temperature analysis, Figure HBH-322l-l. that replaces the hopper diagrams used to illustrate the sequential application of the design rules below the creep regime. Weld metal rupture strength factors are discussed as well in Section 17.4.4.3.5.2.
HBB-3222.1 l)esign Limits
Section 17.4.4.3.5.1 describes the limits ftr Design Loadings, which are analogous to the allowable stress
values in BPVC Section I and BPVC Section VIII. Division 1.
IIBB-3223 Level A and B Service Limits. IIBB- 3224 Level C Service Limits, and HBB-Level D
Service Lintits
The limits for the primary membrane portion of the combined membrane and bending loading in HBII-3223, HIIB-3224, and HHB-3225 are described in Section 17.4.4.3.5.3. The limits for the primary bending portion of the combined membrane and bending loading in HBB-3223. HBB-3224, and HBB-3225 are described in Section 17.4.4.3.5.4. This also includes the rationale for the bending stress load factors that address the reduced load carrying capacity in bending with creep as compared to the ideal elastic-plastic distribution applicable below the creep regime. Section 17.4.4.3.5.5 discusses the use fraction approach to account Ibr a component not operating at a single temperature and/or primary load level throughout its operating history. The applicable code paragraph for use-fraction is HBB-3224(b).
HBB-3227.8 Cladding
Although cladding is not addressed in Chapter 17 of the comprinion Guide, it is included here as an item of interest for proposed molten salt reactors. The current rules provide limited requirements on primary stress limits (i.e., no credit for cladding strength) and similarly limited requirements for deformation- controlled limits (i.e., cladding shall be considered for deformation-controlled limits) but no specific requirements are defined. No additional cladding requirements are provided in Division 5 for fabrication. inspection, or testing. There is a recent technical paper by Messner et al, The Mechanical interaction of Clad and Raw Metal for Molten Salt Reactors, PVP2OI 8-84101 14], that addresses design issues with the goal of improved code provisions for cladding.
HBB-3230 Stress limits for Load Controlled Stress on Bolts
Section 17.4.4.3.9.2 provides the background for the primary stress Design Limits for bolts in HBB-3232,
Service Level A and B limits in HBB-3233, Service Level C in HBB-3234, and Service Level D in
HBB-3235. Also discussed are the rules for deformation-controlled stress and the special provisions in
H B B -T- 1721 and H B B-T- 1722 ftr creep-fatigue damage evaluation.ASME NTB-2 pdf download.