Containment penetration design criteria and implementation

Design and fabrication requirements of the containment liner and re-inforced concrete shell, dictate early specification of design loads transmitted to the containment by various appurtenances. The design of containment penetrations which serve as an anchor for high temperature piping systems to the containment shell, must include the flexibility to accommodate piping configuration modifications after containment design loads have been established. The design loads transmitted to the containment as well as the final sleeve geometry without final piping configuration data are then to be determined. In order to accomplish this, a rational design criteria is presented with the analytical tools required for its implementation. Careful consideration is given to both regulatory requirements, and the ASME piping and containment codes. The criteria includes the effect of temperature as well as mechanical loads for the full range of plant conditions. With this criteria various penetration flued head designs have been compared and optimization achieved. Sleeve wall dimensions and containment loads have been determined without reference to piping configurations. An interaction theory which allows the implementation of the criteria for the determination of the design loads and minimum sleeve wall thickness is developed. This theory applies to elastic-perfectly plastic cylinders (pipes, and sleeves) and accounts for the simultaneous load resultants of transverse shear force, bending moment, torsional moment, and axial force in addition to internal pipe pressure. Application of the theory developed to the determination of sleeve thickness and containment design loads is presented in detail