ASME SECTION III NCA-2008 pdf download

ASME SECTION III NCA-2008 pdf download.General Requirements for Division 1 and Division 2 RULES FOR CONSTRUCTION OF NUCLEAR FACILITY COMPONENTS.
(b) Items classified as Class 3 in their Design Specifica- tions may be constructed and stamped in accordance with the rules of Subsection NB or NC. (c) Containment vessels classified as Class MC in their Design Specification may be constructed and stamped in accordance with the rules of Subsection NB, provided the rules ofNE-7000 are appliedinlieuofthe rules ofNB-7000 for protection against overpressure. (d) When an item is optionally classified to a higher class, the Design Specifications shall identify the minimum required class as well as the optionally selected higher class. (e) Those items designated as parts (Division 1) or appurtenances (Division 1) when used in a Division 2 component, if stamped as parts (Division 1), may be used without further stamping under Division 2 requirements, provided (1) the Designer identifies the parts to be stamped under Division 1 requirements in the Construction Specifi- cation (2) the Designer separately establishes that the use ofsuch parts satisfies the requirements ofthe Design Speci- fication, the Construction Specifications, and the Design Drawings NCA-2135 Code Cases for Division 2 Parts Parts specified to meet the requirements of Division 1 for material, design, fabrication, and examination may be stamped CC in accordance with Division 2 when used in a Division 2 component (CC-1000). For these parts, Divi- sion 1 Code Cases that are applicable for material, design, fabrication, and examination may be used for Division 2 construction in accordance with NCA-1140. NCA-2140 DESIGN BASIS NCA-2141 Consideration of Plant and System Operating and Test Conditions 1 (a) Components and supports ofanuclearpowersystem (NCA-1110) may be subjected to plant and system operating and test conditions that are required to be consid- ered in the design and overpressure protection of the com- ponents and the design of supports in order to satisfy applicable systems safety criteria. The significance ofplant and system operating and test conditions upon design may vary from item to item within a system for a specific operating or test condition experienced by the plant or system. The temperatures, pressures, and mechanical loads to which components and supports are subjected in conse- quence of plant or system operating and test conditions 1 Plant and system operating conditions are commonly referred to as normal, upset, emergency, and faulted. 6 are referred to in this Section as component or support Design, Service, or Test Loadings. (b) The definition of plant and system operating and test conditions, and the determination of their significance to the design and operability of components and supports of a nuclear power system, are beyond the scope of this Section. Appropriate guidance for the selection of plant or system operating and test conditions, that may be deter- mined to be of significance in the selection of component or support Design, Service, or Test Loadings, the combina- tions thereof, and the corresponding acceptable Limits, may be derived from systems safety criteria documents for specific types of nuclear power systems and may be found in the requirements ofregulatory and enforcement authori- ties having jurisdiction at the site. NCA-2142 Establishment of Design, Service, and Test Loadings and Limits In the Design Specification, the Owner or his designee shall identify the loadings and combinations of loadings and establish the appropriate Design, Service, and Test Limits for each component or support. (a) Loadings. The Design, Service, and Test Loadings shall be identified considering all plant or system operating andtestconditions anticipatedorpostulatedto occurduring the intended service life of the component or support. Service Loadings are not required to be identified for Class 2 and 3 components, Class 2 and 3 component supports, and Class MC supports, when the Design Pressure and Design Mechanical Loads result in stresses ofgreater mag- nitude, relative to the allowable stress or stress intensity at the Design Temperature, than would the Service Loadings relative to the allowables for the appropriate Service Level. When this is not the case, and for piping and its supports, Service Loadings shall be identified in the Design Specifi- cation. For the Class MC containment vessel, loadings associated with the containmentfunction shall be identified as Design Loadings, except as provided in NE-3000. (b) Limits. The selection of Design, Service, and Test Limits for each item shall be established in accordance with NCA-2142.4. The rules of this Section do not assure operability of components in which mechanical motion is required. The selection of limits for Design, Service, or Test Loadings to assure operability is beyond the scope of this Section. However, the rules of this Section do require operability of pressure relief valves. When assurance of operability is required, it is the responsibility ofthe Owner to define the appropriate limiting parameters by referring to documents that specify the requirements for operability. Such parameters are outside the scope of this Section [NCA-1130, NCA-2160, and NCA-5210(b)].