=heading= Patram 98 =text= NuPack, the ASME Code for Type B Containments Author: Peter Turula Contact: John J. Oras, Jr. Argonne National Laboratory =tag=1 =heading= ASME B&PV CODE STRUCTURE =text= Sections: I Power Boilers II Materials >>>>>> III NUCLEAR <<<<<<<<<< \ V NDE \ VIII Pressure Vessels IX Welding and Brazing \ XI Nuclear ISI =tag=2 =heading= ASME B&PV CODE STRUCTURE (Continued) =text= Section III is organized as follows: Division 1 - Metal Construction Division 2 - Concrete Vessels and Containments Division 3 - NuPack (issued, June 1997) \ Subsection: \ NCA General Requirements for Div. 1 & 2 WA General Requirements for Div. 3 \ NB Rules for Class 1 Components in Div. 1 WB Rules for Packaging Containments in Div. 3 =tag=3 =heading= Sec. III Div. 3 ( NUPACK ) SCOPE =text= NuPack is limited to:  new  design and construction  containment systems  nuclear spent fuel or high level radioactive waste  transport packaging =tag=4 =heading= Sec. III Div. 3 ( NUPACK ) =text= Subsection WA Similar to Sec. III Div. 1 General (NCA) Subsection WB Similar to Sec. III Div. 1 Class 1 (NB) =tag=5 =heading= NUPACK GENERAL IMPLICATIONS =text= QA Program \ Certification \ Documents \ N Stamping =tag=6 =heading= REQUIRED DOCUMENTS for ORGANIZATIONS =text= Design Owner \ Packaging Owner \ Class TP Certificate Holder each must have:  Quality Assurance Program \  Applicable ASME Certificate =tag=7 =heading= REQUIRED DOCUMENTS for PACKAGINGS =text= from Design Owner (Applicant):  Design Specification - with PE Certification  Design Report (SARP ?) - with PE Certification - with independent review  apply for Certificate of Compliance from Packaging Owner:  Construction Specification - with PE Certification =tag=8 =heading= REQUIRED DOCUMENTS - IMPLICATIONS - =text= \ A new "infrastructure" is required to comply with the ASME NuPack Rules. \ Much of the required documentation could be satisfied through current documentation practices. \ ASME and PE certification requirements are new for packaging, but are not "foreign" to nuclear construction practice under the ASME Code. =tag=9 =heading= N STAMPING for Packagings =text= WA-8212 Latest draft did require N-Stamping, to be applied to the nameplate or vessel \ The stamping itself is not an issue. The associated "infrastructure" is the issue \  certification as "N-TP certificate holder" \ For a potential fabricator under Division 3, is there enough business to justify the cost of maintaining a certificate? =tag=10 =heading= Nupack GENERAL DESIGN - LOADINGS DEFINED - =text= WB-3100 Covers packaging "Operating Conditions" \  Normal Operating Conditions - Normal Conditions of Transport (NCT) - In Plant Handling Conditions Like Design and Level A Service in NB \  Hypothetical Accident Conditions (HAC) \ Like Level D Service in NB \ Test Conditions (hydrostatic pressure test) =tag=11 =heading= NUPACK LOADINGS - IMPLICATIONS - =text= \ There is no "design loading" in NuPack The ASME concept of a design loading umbrella with a high safety factor is not used directly, but a high safety factor in applied for the primary stresses due to Normal Condition loadings. =tag=12 =heading= NUPACK DESIGN BY ANALYSIS =text= WB-3210 "Design Criteria" presents the same ASME stress categories scheme as does NB-3210. \  Stress limits for Normal Operating Conditions (including NCT): Same as limits for Level A Service and limits for Design - superimposed. \  Stress limits for HAC: Same as Level D Service Limits, BUT without Appendix F inelastic analysis rules. =tag=13 =heading= NUPACK DESIGN BY ANALYSIS - IMPLICATIONS - =text= \ NuPack does NOT provide Appendix F relief for certain high stress levels under hypothetical accident conditions, such as the thermal test (30 minute fire), or the 30 foot drop test, which may analytically show local yielding of the containment boundary. =tag=14 =heading= NUPACK DESIGN BY ANALYSIS THERMAL STRESS CLASSIFICATION =text= ASME generally classifies thermal stresses as "secondary" - does not mean unimportant \ Reason - thermal stresses are always self-limiting; i.e., deformation controlled \ Given enough strain, the stress will go away; whereas, for gravity load or pressure, stress does not go away with strain. =tag=15 =heading= NUPACK DESIGN BY ANALYSIS THERMAL STRESS CLASSIFICATION (Continued) =text= WB-3217 requires that differential thermal expansion stresses in connected concentric shells be treated as Primary, not Secondary. \ In general, deformation affects operability, but the ASME Code is not concerned with operability. \ In packaging the high level of strain needed to relieve thermal load stresses may not be acceptable because containment could be jeopardized. =tag=16 =heading= NUPACK DESIGN BY ANALYSIS THERMAL STRESS CLASSIFICATION - IMPLICATIONS - =text= Thermal loading of concentric cylinders - especially where a thick cylinder under elastic strain may load a constrained concentric cylinder into the plastic strain range - \ primary load limits apply. \ In particular, the buckling evaluation rules for primary stresses apply. \ High thermal gradients under a hypothetical accident fire test may not be acceptable under NuPack rules. =tag=17 =heading= ASME Sec. III Div. 3 IS NOW AVAILABLE =text= NuPack, the ASME Code for Type B Containments Peter Turula Argonne National Laboratory 708 252-5848 turula@anl.gov =tag=18