Better Fuel Handling Performance Through Improved Elastomers and Seals

Abstract

In the area of elastomers, tests have identified specific compounds that perform well in each class of CANDU service. They offer gains in service life. sometimes by factors of ten or more. Moreover. the aging characteristics of these specific compounds are being thoroughly investigated, whereas many elastomers used previously were either non-specific or their aging was unknown. In this paper the benefits of elastomer upgrading. as well as the deficiencies of current station elastomer practices, are discussed in the context of fuel handling equipment. Guidelines for procurement storage, handling and condition monitoring of elastomer seals are outlined. In the area of rotary seals (non-elastomeric) there have also been significant advances. In the fuelling machines, low friction is needed for accurate positioning. The development of an improved seal is described, which since 1992 has saved at least 1 million per year at Pickering alone.