Final report B, D, F reactor side shield hole boring technology

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Four years of intermittent development has culminated in the successful test drilling on-reactor, of one step plug hole. Since 1960, several different drive units and many diamond, carbide, and tool steel cutting heads were tried unsuccessfully in attempts to bore a stepped hole in a mockup of B, D, P side shielding. Success was finally achieved in 1963 using a standard horizontal boring mill and tool steel cutters. With slight modifications, this same equipment was successfully used in an on-reactor test drilling at F Reactor in December of that year. The on-reactor test revealed the need for improvements in the … continued below

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25 p.

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Clemans, W. H. February 3, 1964.

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  • Hanford Atomic Products Operation
    Publisher Info: General Electric Co., Richland, WA (United States). Hanford Atomic Products Operation
    Place of Publication: Richland, Washington

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Four years of intermittent development has culminated in the successful test drilling on-reactor, of one step plug hole. Since 1960, several different drive units and many diamond, carbide, and tool steel cutting heads were tried unsuccessfully in attempts to bore a stepped hole in a mockup of B, D, P side shielding. Success was finally achieved in 1963 using a standard horizontal boring mill and tool steel cutters. With slight modifications, this same equipment was successfully used in an on-reactor test drilling at F Reactor in December of that year. The on-reactor test revealed the need for improvements in the equipment. Chip flow was inadequate and appeared to be caused by poor air flow in the core receiver. Cast iron cutting technology used on the mockup did not work on-reactor and had to be revised on the spot. The graphite did not break up into chunks as desired and had to be manually removed. None of the steel cores were more radioactive than 50 mr/hour at approximately 2 inches, but the cast iron core read 300 mr/hour at 10 feet. It had to be handled very quickly. The dose rate for handling the graphite was 400 mr/hour. It, too, was handled quickly. The beam coming from the hole before removal of the cast iron was about 15 mr/hour. After the cast iron and graphite were removed, the beam vas about 2 R/hour. Due to the necessity of manual core handling, contamination was easily spread about the workplace. With proposed changes in material handling, particulate matter can be contained. The over-all cost of the operation of physically drilling the hole was approximately $13,500.

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25 p.

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OSTI as DE94010628; Paper copy available at OSTI: phone, 865-576-8401, or email, reports@adonis.osti.gov

Other Information: DN: Declassified

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Office of Scientific & Technical Information Technical Reports

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  • February 3, 1964

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  • Nov. 3, 2018, 11:47 a.m.

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  • Nov. 13, 2024, 1:51 a.m.

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Clemans, W. H. Final report B, D, F reactor side shield hole boring technology, report, February 3, 1964; Richland, Washington. (https://digital.library.unt.edu/ark:/67531/metadc1314673/: accessed March 15, 2025), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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