8/30/2023 0 Comments Sauter saf 850The critical number of unmoderated elements in a reflected array was greater than 2500. lt was found that the minimum critical number of 66 elements, containirg about 5 kg of /sup 235/U occurred at an H: /sup 235/U atomic ratio of 380. ![]() In order to establish both the minimum critical number of watermoderated and -reflected elements and the relationship between moderation and critical more ยป number, several critical arrays covering a wide range of moderation were assembled. Throughout the experiments each element was encased in a sealed aluminum tube. The uranium concentration is 400 mg/cm/sup 3/, of which 93.15% is /sup 235/U, yielding a C: /sup 235/U atomic ratio of about 90. Each element is a 0.746-in.-dia and 50.5-in.-long uranium carbidegraphite cylinder containing seven uniformly spaced longitudinal holes. ![]() Critical experiments were performed with fuel elements for the Project Rover KIWI-B-2A reactor to determine nuclearly safe conditions for their production, storage, and transportation.
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