Abstract
A review of present nuclear power plant service water piping systems and related heat exchangers indicate a wide diversity of problems. Many can be controlled or rectified by conventional means, but some, affected by microbiologically influenced corrosion, will require major efforts to minimize degradation.
Simple solutions, such as a material replacement or biocide injection or upgraded maintenance programs may not be adequate. A coordinated systems program that encompasses all of these, as well as other concerns will be necessary to mitigate the problems in many cases.
While it is recognized that a total systems approach will be necessary for success, an inadequate material application cannot hope to be successful. This presentation will review the development of a material that offers a potential of success and has already been used for replacement systems in several service water piping and heat exchanger systems.
The material considered is a six percent molybdenum austenitic stainless alloy with a nitrogen addition. The effects of alloying elements are discussed along with corrosion testing and fabrication concerns. Product development for nuclear components are reviewed along with future research needs.
