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The Dow Chemical Company announced that AmerenUE’s Callaway Nuclear Power Plant located near Fulton, MO, has chosen DOW CONTINUUM DGDA-2492 BK Bimodal Polyethylene Resin to replace carbon steel in its buried essential service water (ESW) pipe system.
The Dow resin was specified as an American Society for Testing and Materials (ASTM) PE 4710 material for use in 36-inch diameter pipe at the Callaway power plant. This is the first use of polyethylene in a nuclear safety related application. Callaway submitted an American Society of Mechanical Engineers (ASME) relief request to the Nuclear Regulatory Commission (NRC) to allow the use of high-density polyethylene (HDPE) for buried portions of the Callaway ESW system and received a safety evaluation from the NRC authorizing the use of HDPE at Callaway for the ESW system.
“AmerenUE is continuously looking for opportunities to take advantage of material and technological advances that will reduce operational costs and increase the safety and reliability of our systems,” said Matthew Brandes, mechanical design engineer for AmerenUE at the Callaway Plant. “The selection of CONTINUUM bimodal resin for our ESW pipe system enables a long-term, cost-effective solution to a challenge now facing all nuclear power utilities, namely the high costs associated with repair or replacement of buried piping systems. Compared to steel piping systems, which are prone to internal corrosion, pitting and the formation of pin-hole leaks well before the end of their expected life span, high density polyethylene pipe does not corrode and provides an equal or greater level of performance and safety. With NRC approval of HDPE in buried portions of Callaway’s ESW system, the HDPE has the potential to become the standard for buried ASME Class 3 and other nuclear power pipe systems.”
Callaway found it well suited for power plant applications such as ESW pipe systems, which require long-term hydrostatic strength, resistance to slow crack growth and performance at elevated temperatures such as 176° F.
CONTINUUM DGDA-2492 NT Bimodal Polyethylene Resin was developed using UNIPOL II process technology and designed for pipe applications. Applications for CONTINUUM Bimodal Polyethylene Resins include natural gas distribution pipes, sewage pipes, municipal water service lines, industrial piping and mining. www.dowcontinuum.com