Fast-Response Cryogenic Calorimeter Containing a 52-Kilogram Radiation Absorber

  • P. J. Bendt
  • J. L. Yarnell
Part of the Advances in Cryogenic Engineering book series (ACRE, volume 23)


This paper describes an isothermal liquid helium boil-off calorimeter which was used to measure fission product beta and gamma radiation following exposure of 60-mg 235U foils to the thermal neutron flux in the Los Alamos Omega West Reactor. This work is part of a program sponsored by the U. S. Nuclear Regulatory Commission to provide better values of the fission product decay heat following reactor shutdown, for use in reactor safety evaluations. Particular effort was directed at reducing the uncertainty during early cooling times (10 to 1000 sec), where the present American Nuclear Society ANS-5.1 Decay Heat Standard [1] is assigned an uncertainty of +20% to -40%.


Fission Product Liquid Helium Ball Valve Nuclear Regulatory Commission Decay Heat 
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    American Nuclear Society, Draft Standard ANS 5.1, approved by Subcommittee ANS-5 of the ANS Standards Committee (October 1971 and revised 1973).Google Scholar
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Copyright information

© Plenum Press · New York and London 1978

Authors and Affiliations

  • P. J. Bendt
    • 1
  • J. L. Yarnell
    • 1
  1. 1.Los Alamos Scientific LaboratoryUniversity of CaliforniaLos AlamosUSA

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