CERREX Software Application to the Japan Research Reactor No. 2 (JRR-2) Decommissioning Programme. Appendix VI

The JRR-2 was a heavy water moderated and cooled CP-5 type research reactor. It used highly enriched uranium fuels to obtain a neutron flux of 1.8 x 1014 n.cm-2.s-1 and achieve 10 MW thermal power. The reactor first went critical in October 1960 and was used for neutron scattering experiments, irradiation tests of nuclear fuels and materials, radioisotope production, boron neutron capture therapy, etc. The JRR-2 was finally shut down owing to degradation of the facility after 36 years of operation. The JRR-2 decommissioning project started in August 1997. The project was divided into four major phases: - Phase 1: Preparation (shutdown related activities). - Phase 2: Isolation of cooling systems and the reactor body. - Phase 3: Tritium decontamination and dismantling of cooling system components. - Phase 4: Removal of the reactor vessel and dismantling of remaining facilities. Activities implemented within Phases 1-3 were completed by 2005. The reactor vessel has been isolated for safe storage until Phase 4 begins. The major activities are listed. The actual expenditures of the contractual work are as follows: - Phase 1: 62 000 000 yen ( Euro 470 000). - Phase 2: 200 000 000 yen ( Euro 1 500 000). - Phase 3: 356 000 000 yen ( Euro 2 700 000)