Metallic materials corrosion in the CRNL radwaste incinerator

Corrosion coupon evaluation and in-service materials performance for the CRNL waste incinerator has been carried out since 1980. Data are presented to show that types 309, 310 and 446 stainless steel, Alloy 625 and Alloy 333 all perform well in short-term tests in the afterburner environment (850-10000C) but are subject to sigma-phase embrittlement and grain boundary carbide precipitation following long-term exposures. Several alloys performed satisfactorily in the primary chamber (5000C), and the material of construction, type 310 stainless steel, continues to provide good service