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From a biological point of view I-131 is the most significant short lived radioactive isotope which could be released to the biosphere during a hypothetical LOCA (Loss-of-Coolant Accident). Present codes used for licencing of light water reactors (LWR) assume a 3% release of I-131 due to a LOCA. This assumption is, however, in sharp contrast with data from: (i) the analysis of the Three Mile Island-2 (TMI-2) accident; (ii) results from hot cell tests on spent LWR fuel rods at the Oak Ridge National Laboratory (ORNL); (iii) earlier tests at the KFA Hot Cells (KFA-HC). Evaluation of TMI-2, ORNL and KFA-HC data yielded results indicating that the I-131 release is at least a factor of 100 or more lower than assumed in the safety codes. For confirmation of the results obtained in the KFA-HC tests, a test programme was initiated to perform similar experiments under typical LOCA conditions in-pile at the HFR Petten in the so-called ISOLDE (Iodine Solubility and Degassing Experiment) project, the findings of which are reported in this paper.

Additional information

Authors: FISCHER B, JRC Petten (NL);MARKGRAF J F W, JRC Petten (NL);RUYTER I, Kernforschungsanlage Jülich GmbH, Jülich (DE)
Bibliographic Reference: Paper presented: International Conference on Irradiation Technology, Saclay (FR), May 20-22, 1992
Availability: Available from (1) as Paper EN 36851 ORA
Record Number: 199210801 / Last updated on: 1994-12-02
Original language: en
Available languages: en