Status of follow-up investigations on the HFR-K1 irradiation experiment (interim report)

Automatic translation: The follow-up test results to date on the BEs from the HFR-K1 test are compiled. The ceramographic follow-up test on the BE A2 shows a failure rate of 95%. Preliminary conclusions can be drawn about particle defect rates from the release of fission noble gases at room temperature and from the post-irradiation bake-out test at 1000°C. From a cautious estimate, a measurable amount of defective particles can be expected for all BEs, which must be confirmed by further follow-up test results.