NDLI: Simplified Approach to Establishing Bounding Main Steam Piping Support Load Increase Due to Reactor Power Uprate

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Stakenborghs, Robert Dziuba, Lindsey
Copyright Year	2009
Abstract	Many nuclear power reactors are increasing their electrical output by increasing their licensed thermal power output. This process requires submitting license change request information to the appropriate regulatory body. One of the fundamental changes to a plant operating condition that must occur to provide additional electrical power generation is an increase in the main steam mass flow. This increase in mass flow results in an increase in the fluid velocity at the main turbine stop and control valves. The increased velocity can be correlated to an increase in the piping support loads as a result of a main turbine trip with a corresponding stop valve closure. The increased loads are a concern for the regulatory body as well as the plant owners since these loads occur at some real frequency in a plant. Typically, an overly conservative scaling factor has been applied to these loads, which may result in unnecessary plant modifications. This paper discusses the fundamental transient fluid dynamic process that results in the main steam piping load. A simplified method is provided that more realistically estimates bounding magnitudes of piping support loads versus percentage power uprate. This method will allow plant design engineers to more realistically determine the increase in the main steam piping support loads that result from power uprate conditions.
Sponsorship	Nuclear Engineering Division
Starting Page	1011
Ending Page	1019
Page Count	9
File Format	PDF
ISBN	9780791843529
DOI	10.1115/ICONE17-75743
e-ISBN	9780791838525
Volume Number	Volume 2: Structural Integrity; Safety and Security; Advanced Applications of Nuclear Technology; Balance of Plant for Nuclear Applications
Conference Proceedings	17th International Conference on Nuclear Engineering
Language	English
Publisher Date	2009-07-12
Publisher Place	Brussels, Belgium
Access Restriction	Subscribed
Subject Keyword	Plant design Valves Licensing Flow (dynamics) Stress Thermal energy Transients (dynamics) Electric power generation Power uprate Fluids Steam Engineers Nuclear reactors Pipes Turbines
Content Type	Text
Resource Type	Article

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