The appropriateness of seismic design requirements and methods for nuclear power plant piping has been of increasing concern in the industry.Modern designs are characterized by a large number of seismic supports and many snubbers.Costs for design, installation, and maintenance for piping systems are extreme.In addition, the high level of congestion in the plant, from the structure for these supports, has an adverse impact on installation, maintenance, inservice inspection, and testing of all equipment.To improve this condition, it is important to investigate the root causes.Two aspect of the problem are evaluated in this report – the nuclear piping code requirements for seismic loading, and the analytical methods used to predict the loads.