Thermal Deflection of the Yankee Fuel Assembly From Linear and Non-Linear Temperature Gradients

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Theoretical conditions were investigated for determining the thermal deflection of the definitive design unshrouded Yankee fuel assembly and the compromise design fuel assembly. In addition, an experimental study was completed on the thermal deflection of the compromise design fuel assembly from linear and nonlinear temperature gradients. All of the theoretical analyses performed on the definitive design clearly indicate that excessive bowing in the order of 0.150 inch may occur within the reactor during normal operation. Slnce the nominal clearance available in this design between a fuel assembly and an adjacent control rod is about 0.120 inch, interference between a fuel ... continued below

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Pages: 68

Creation Information

Johnson, C. G. March 1, 1959.

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Description

Theoretical conditions were investigated for determining the thermal deflection of the definitive design unshrouded Yankee fuel assembly and the compromise design fuel assembly. In addition, an experimental study was completed on the thermal deflection of the compromise design fuel assembly from linear and nonlinear temperature gradients. All of the theoretical analyses performed on the definitive design clearly indicate that excessive bowing in the order of 0.150 inch may occur within the reactor during normal operation. Slnce the nominal clearance available in this design between a fuel assembly and an adjacent control rod is about 0.120 inch, interference between a fuel assembly and its adjacent control rod can occur, resulting in restricting the movement of the control rod. When buildup of mechanical tolerances are considered, this condition becomes more severe. Redesign of the definitive design fuel assembly thus became mandatory to prevent interference with the movement of control rods. The compromise fuel assembly design evolved as a result of these considerations. The compromise design employs the use of the brazed ferrule fuel sub-assembly design concept, but incorporates several fundamental changes in design that increase clearances adjacent to the control rod to reduce thermal bowing of the complete assembly. The compromise fuel assembly is allowed to deflect under thermal distortion to a limited extent and is designed so that under the worst set of circumstances the available clearance between the fuel assembly and control rod is at least 0.001 inch. The compromise design therefore, constitutes a safe design from a thermal deflection standpoint. (auth)

Physical Description

Pages: 68

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Source

  • Other Information: For Yankee Atomic Electric Co. Orig. Receipt Date: 31-DEC-59

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  • Report No.: YAEC-80
  • Grant Number: AT(30-3)-222, SUBCONTRACT NO. 1
  • DOI: 10.2172/4262983 | External Link
  • Office of Scientific & Technical Information Report Number: 4262983
  • Archival Resource Key: ark:/67531/metadc1023497

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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.

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Creation Date

  • March 1, 1959

Added to The UNT Digital Library

  • Oct. 15, 2017, 10:09 p.m.

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  • Jan. 17, 2018, 2:57 p.m.

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Johnson, C. G. Thermal Deflection of the Yankee Fuel Assembly From Linear and Non-Linear Temperature Gradients, report, March 1, 1959; Pittsburgh, Pennsylvania. (digital.library.unt.edu/ark:/67531/metadc1023497/: accessed December 10, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.