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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.
Tsutomu Hoshino, Jiro Wakabayashi, Shigenori Hayashi
Nuclear Science and Engineering | Volume 23 | Number 2 | October 1965 | Pages 170-182
Technical Paper | doi.org/10.13182/NSE65-A28142
Articles are hosted by Taylor and Francis Online.
An expression different from the conventional modal expansion about space-dependent linear system kinetics is proposed. The solution is expressed in the form of a Laplace-transformed source transfer function. The Taylor expansion of the function in ‘s’ (the variable in the transformed domain) is obtained by solving the related stationary equations. The series is approximately continued to the simple form of the transfer function such as the first-order lag or the transport lag expression. In this method, it is not necessary to solve the eigenvalue problem directly. This solution contains the contribution from the higher modes and gives a practical approximation in a simple form, even if the response includes much higher modes. A numerical example is shown. This method is also applicable to general linear distributed constant systems. Some applications to coupled reactor theory and to thermalization kinetics are mentioned.