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Norway’s Halden reactor takes first step toward decommissioning
The government of Norway has granted the transfer of the Halden research reactor from the Institute for Energy Technology (IFE) to the state agency Norwegian Nuclear Decommissioning (NND). The 25-MWt Halden boiling water reactor operated from 1958 to 2018 and was used in the research of nuclear fuel, reactor internals, plant procedures and monitoring, and human factors.
M. L. Williams
Nuclear Science and Engineering | Volume 108 | Number 4 | August 1991 | Pages 355-383
Technical Paper | doi.org/10.13182/NSE90-33
Articles are hosted by Taylor and Francis Online.
A general theory is developed to describe the mechanism by which the response observed on a detector propagates throughout a system. The response is transferred between a particle source and the detector by special particles called contributons. The distribution in phase-space of the response carried by contributons defines a new quantity called the “response continuumwhich depends on solutions to the forward and adjoint Boltzmann equations. A transport equation for the response distribution is derived, and properties of the response continuum are discussed. The response concentration is described by the contributon response density and flux, which are used to locate regions containing large amounts of potential response contribution. The flow of response through space is described by streamlines of a vector field called the “response current.” This field is related to two new variables called the “response potential” and “vorticity,"respectively. Sample results are presented for “contributon dipole” configurations. A spherical harmonic expansion of the angular flux is given to describe directional characteristics of the response continuum. The “contributon slowing-down equation” is derived to describe the simultaneous transfer of response through space and energy. A new contributon Monte Carlo method to simulate response transport is discussed.