Declassified 29 Aug 1973. 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. Each element is a 0.746-in.-dia and 50.5-in.-long uranium carbidegraphite cylinder containing seven uniformly spaced longitudinal holes. 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. Throughout the experiments each element was encased in a sealed aluminum tube. In order to establish both the minimum critical number of watermoderated and -reflected elements and the relationship between moderation and critical …
continued below
Publisher Info:
Oak Ridge National Lab., Tenn. (USA)
Place of Publication:
Oak Ridge, Tennessee
Provided By
UNT Libraries Government Documents Department
Serving as both a federal and a state depository library, the UNT Libraries Government Documents Department maintains millions of items in a variety of formats. The department is a member of the FDLP Content Partnerships Program and an Affiliated Archive of the National Archives.
Descriptive information to help identify this report.
Follow the links below to find similar items on the Digital Library.
Description
Declassified 29 Aug 1973. 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. Each element is a 0.746-in.-dia and 50.5-in.-long uranium carbidegraphite cylinder containing seven uniformly spaced longitudinal holes. 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. Throughout the experiments each element was encased in a sealed aluminum tube. In order to establish both the minimum critical number of watermoderated and -reflected elements and the relationship between moderation and critical number, several critical arrays covering a wide range of moderation were assembled. 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. The critical number of unmoderated elements in a reflected array was greater than 2500. Experiments were also performed with uranium oxidegraphite elements from an early stage of production. The minimum critical number of full- length elements in a moderated and reflected array was 40, containing about 4.6 kg of /sup 235/U. The H: /sup 235/U atomic ratio was 270. Several additional experiments established that the designs of the shipping containers and graphitizing fixture used for the elements are conservative. (auth)
This report is part of the following collection of related materials.
Office of Scientific & Technical Information Technical Reports
Reports, articles and other documents harvested from the Office of Scientific and Technical Information.
Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.
Johnson, E. B. & Fox, J. K.Critical mass studies. Part XII. Rover reactor fuel elements,
report,
September 18, 1962;
Oak Ridge, Tennessee.
(https://digital.library.unt.edu/ark:/67531/metadc1027295/:
accessed May 15, 2024),
University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu;
crediting UNT Libraries Government Documents Department.
