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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.
H. Foerstel, K. Lepa, H. Trierweiler.
Fusion Science and Technology | Volume 14 | Number 2 | September 1988 | Pages 1203-1208
Tritium Release Experiment | doi.org/10.13182/FST88-A25303
Articles are hosted by Taylor and Francis Online.
After HT is converted to HTO by the soil, the HTO is reemitted back into the atmosphere. Since HTO is more radiotoxic by a factor of 104, this reemission is an important part of the radioecological pathway of HT1. Laboratory studies show that the reemission rate from natural soil cores depends on the turnover in the gas space above the soil surface. Up to a wind velocity of about 4 m s−1, the portion of HTO reemitted hourly increases to about 18 % of the initial amount of the reaction product. However, after the first hour, the observed reemission rate decreases quickly to about 3% h−1. Varying the humidity of an air stream fed at a velocity of about 3 m s−1 into the reaction chamber, had no influence on the reemission rate. For the Canadian release study, small soil samples were exposed to the plume and afterwards to the air. Then, at certain intervals following the release, the soil containers were sealed with gastight lids. The remnant HTO activity was then determined by azeotropic distillation. The reemission rate, determined by this procedure, was about 3% h−1 during the day. During the night, no HTO loss was observed, possibly due to dew formation.