Quarterly Report on the Strontium Heat Source Development Program and the Beneficial Isotopes Utilization Program, Division of Nuclear Research and Applications for October-December 1976

摘要

Metallographic examination of the Hastelloy C-276 specimens from the 1000-hr tests with WESF 90SrF2 has been completed. The specimens exhibited much more attack than was observed in the equivalent nonradioactive test specimens or in the original 90SrF2 tests. Decreasing the S/V ratio of the test couples produced a marked increase in the metal attack observed.nThe 6000-hr tests with WESF 90SrF2 have been completed. When the test couples were removed from the furnaces it was found that a number of couples which had been held at 800°C had failed. The couples were contained in protective jackets of Inconel 600 and both the Inconel 600 capsules and the test couples were badly corroded. There was no visual indication of problems with the couples tested at 600 and 1000°C or with couples tested at 800°C in a second furnace. The furnace containing the failed capsules gave no indi¬cation of a malfunction or overheating and was in good working condition when the test was terminated. Reasons for the capsule failures are now being investigated.nThe program plan for Task 3 - Capsule Qualification and Licensing has been issued. The topical report summarizing the results of the 90SrF2 dis-solution studies has been issued (BNWL-2101).