The canister durability tests of the in-can type incineration-melting furnace

not registered; Kato, Noriyoshi; Miyazaki, Hitoshi; Tanimoto, Kenichi

Construction of LEDF (Large equipment dismantling facility) which has the in-can type incineration-melting furnace is planned. The in-can type incineration-melting furnace performs incineration and melting solidification of radioactive waste within the canister made from ceramics, and is characterized by discarding the canister. On the other hand, as for this furnace, the amount of incineration is restrained to canister capacity, Therefore, how to repeat incineration and melting can be considered as a method of increasing the amount of incineration. However, we were anxious about the contact time of the melt and a canister extending, the amount of wear of canister base material increasing, or the heat load (heat cycle) to a canister increasing, and the material intensity of canister base material falling, in order that this method may repeat incineration and melting. then, the tests used imitation waste, are the conditions which repeat (1,3, 10 bathes) the incineration temperature of 1000 C, and the melt temperature of 1500 C, and investigated change of the amount of wear of canister base material and high temperature bend strength. The result is as follows. (1) The amount of wear of canister base material was 0.09 mm/h at the maximum. This result was a sufficiently few value, even if compared with the conventional result (1.0 mm/h). Moreover, the high temperature bend strength of canister base material is about 3 Mpa on an average, and change was seen before and after the examination to which heat load is applied. (2) These tests showed that the factor which spoils the soundness of a canister was oxidization degradation of the canister base material by peeling from the base material of Glaze (glass coating material). The portion embrittlement by oxidization degradation is locally worn down by contact of the melt. (3)Heat-resistant temperature of Glaze is about 1300 C. At the melting operation temperature of 1500 C, and ...