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SM-1 Research and Development Program: Long-lived Induced Activity Buildup During SM-1 Core I Lifetime. Task XVIII, Phase I

One of 91 reports in the series: AEC Research and Development Report available on this site.

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Abstract: The results of activity buildup studies in the SM-1 performed during Core I lifetime (June 3, 1957 to April 28, 1960) are reported. Data are presented on the extent, nature, and mechanism of the buildup of long-lived gamma emitting nuclides in the reactor primary system. Radiation levels after reactor shutdown are presented, as well as mathematical equations used to account for the observed activity levels. The data have shown that Co60 is the major contributor to radiation levels in the SM-1. Co60 activity arises from the cobalt in Haynes 25 alloy flux suppressors, and the cobalt impurity in stainless … continued below

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xv, 154 pages ; illustrations.

Creation Information

Bergmann, C. A.; Bergen, C.; Cox, J. F.; Chupak, J. & Grant, L. G. November 30, 1960.

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Abstract: The results of activity buildup studies in the SM-1 performed during Core I lifetime (June 3, 1957 to April 28, 1960) are reported. Data are presented on the extent, nature, and mechanism of the buildup of long-lived gamma emitting nuclides in the reactor primary system. Radiation levels after reactor shutdown are presented, as well as mathematical equations used to account for the observed activity levels. The data have shown that Co60 is the major contributor to radiation levels in the SM-1. Co60 activity arises from the cobalt in Haynes 25 alloy flux suppressors, and the cobalt impurity in stainless steel. After 35 months operation at an average power level of 55%, deposited Co60 activity accounted for approximately 83% of the total radiation level (mr/hr) contributed by the long-lived gamma emitting nuclides. The contribution of the primary coolant activity to the total radiation level is insignificant when compared to the contribution of the activity deposited on the walls of the system. The radiation level on the super-heater side of the steam generator was about 1400 mr/hr after 35 months of reactor operation. The percentages of Co60 activity in the coolant and in the deposits were not the same. This indicates either that nuclides are depositing irreversibly on the surface of the system, or that all nuclides are not exchanging at the same rate. The ratio of Co58/Co60 in the deposits shows that a major fraction of the nuclides are irreversibly deposited. Mathematical equations derived during the course of work were used to predict the observed activity buildup on SM-1 primary system surfaces. Certain constants in the the equations were obtained from the experimental data. Calculated values of activity levels based on the equations were in good agreement with the activity levels found on the primary system. The equations may be used to determine the effect of cobalt (or other impurities) on deposited activity.

Physical Description

xv, 154 pages ; illustrations.

Notes

Digitized from microopaque cards.

Contract No. AT(30-3)-326 with U.S. Atomic Energy Commission, New York Operations Office.

Includes bibliographic references (pages 153-154).

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  • Report No.: APAE-77
  • Grant Number: AT(30-3)-326
  • SuDoc Number: Y 3.AT 7:22/APAE-77
  • Accession or Local Control No: metadc1201966
  • Archival Resource Key: ark:/67531/metadc1201966

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Technical Report Archive and Image Library

This selection of materials from the Technical Report Archive and Image Library (TRAIL) includes hard-to-find reports published by various government agencies. The technical publications contain reports, images, and technical descriptions of research performed for U.S. government agencies. Topics range from mining, desalination, and radiation to broader physics, biology, and chemistry studies. Some reports include maps, foldouts, blueprints, and other oversize materials.

TRAIL Microcard Collection

Imaged from microcard, these technical reports describe research performed for U.S. government agencies from the 1930s to the 1960s. The reports were provided by the Technical Report Archive and Image Library (TRAIL).

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Creation Date

  • November 30, 1960

Added to The UNT Digital Library

  • Aug. 15, 2019, 10:26 p.m.

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  • April 28, 2020, 3:53 p.m.

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Bergmann, C. A.; Bergen, C.; Cox, J. F.; Chupak, J. & Grant, L. G. SM-1 Research and Development Program: Long-lived Induced Activity Buildup During SM-1 Core I Lifetime. Task XVIII, Phase I, report, November 30, 1960; Schenectady, New York.. (https://digital.library.unt.edu/ark:/67531/metadc1201966/: accessed July 4, 2022), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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