Pathfinder Atomic Power Plant. Boron Stainless Steel Control Rods for Pathfinder Reactor. Final Summary Report

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An extensive development, fabrication, and design analysis program was completed on 2 wt% boron stainiess steel for Pathfinder boiler and superheater control rods. Results indicated that the control rods will operate satisfactorily in the reactor under all foreseeable conditions. It was concluded that the maximum local burnup on the boiler rods is limited to 1.0 core at.% and the superheater rods to 0.5 core at.% to remain well below the onset of any deleterious effects. All stresses imposed on the material were found to be below yield strength. The deflections were calculated and were not sufficient to restrict any movement … continued below

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54 pages

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Patterson, D.A.; Nehrig, D.A.; Klumb, R.H. & Peterson, T.E. February 15, 1963.

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Description

An extensive development, fabrication, and design analysis program was completed on 2 wt% boron stainiess steel for Pathfinder boiler and superheater control rods. Results indicated that the control rods will operate satisfactorily in the reactor under all foreseeable conditions. It was concluded that the maximum local burnup on the boiler rods is limited to 1.0 core at.% and the superheater rods to 0.5 core at.% to remain well below the onset of any deleterious effects. All stresses imposed on the material were found to be below yield strength. The deflections were calculated and were not sufficient to restrict any movement of the cruciform during reactor operations and scrams. A welding development program produced a sound fabrication method for producing the control rods. A prototype rod was extensively tested in the hot control rod drive test, including a large number of scrams. The rod showed no deleterious effects. The rods were designed to accommodate any helium release and swelling that may occur. (M.C.G.)

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54 pages

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  • Other Information: For Northern States Power Co., Minneapolis and Central Utilities Atomic Power Associates. Orig. Receipt Date: 31-DEC-63

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  • February 15, 1963

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  • Oct. 18, 2017, 7:39 a.m.

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  • Feb. 27, 2021, 12:29 a.m.

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Patterson, D.A.; Nehrig, D.A.; Klumb, R.H. & Peterson, T.E. Pathfinder Atomic Power Plant. Boron Stainless Steel Control Rods for Pathfinder Reactor. Final Summary Report, report, February 15, 1963; Milwaukee, Wisconsin. (https://digital.library.unt.edu/ark:/67531/metadc1028585/: accessed September 26, 2023), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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