Review Of Helium Impurities Effect On Corrosion Process Of HTGR Reactor Coolant

REVIEW OF HELIUM IMPURITIES EFFECT ON CORROSION PROCESS OF HTGR REACTOR COOLANT

Sriyono
Pusat Teknologi Reaktor dan Keselamatan Nuklir - BATAN,
Kawasan PUSPIPTEK Gd. 80, Serpong, Tangerang, 15310

ABSTRACT
REVIEW OF HELIUM IMPURITIES EFFECT ON CORROSION PROCESS OF HTGR REACTOR COOLANT. HTGR is an advanced nuclear reactor which has helium gas as a coolant and operates safely at high temperature. Corrosion is one of serious problem must be solved in HTGR caused by its impurities. The impurities of helium gas are H2O, CO, CO2, N2, H2 and CH4 which has various concentrations in HTGR coolant system. Corrosion in HTGR system caused by oxidation and carburization-decarburization process. The results of oxidation are oxide scale and carburization-decarburization promotes the carbide compound. Both of these adhered in the material surface and degraded it. The many experiments have been done to understand the effect of impurities to material in HTGR. The purpose of review is to know the effect of helium impurities to material surrounding and determine the suitable material in HTGR design. Among the materials, 2 1/4Cr-1Mo and modified 9Cr1Mo ferrite steels are considered for application in reactor pressure vessels. Fe-Cr-Ni alloys such as Alloy 800H and austenitic stainless steels are considered for recuperates and reactor internals. Alloys such as 617, Hastelloy X, and Hastelloy XR are considered for components that will be exposed to helium coolant at temperatures up to 900°C. Alloys such as 713LC and Mo-TZM are considered for the turbine blade. Alloys such as A286, 706, and 718, are examined for turbine disk application.

Keywords: impurities, helium, corrosion, coolant, HTGR
Published : Proceeding "SEMINAR NASIONAL PENGEMBANGAN ENERGI NUKLIR II 2009", Jakarta, 25 Juni 2009.