ANALISIS DAMPAK KECELAKAAN REAKTOR KARTINI DITINJAU DARI DISTRIBUSI RADIONUKLIDA 90Sr dan 137Cs MENGGUNAKAN SOFTWARE PC COSYMA

A simulation concerning on the impact analysis of Kartini Reactor accident in terms of 90Sr and 137Cs radionuclide distribution using PC-Cosyma software have been done to determine the value of depositioned radionuclide concentration on the ground and effective dose received by the population. The simulation is using deterministic calculation method. This methode is only takes one single value for each parameter. The first step of simulation is to calculate the radioactivity value of fission nuclide using program named ORIGEN2, which is used as inventory data in PC-Cosyma software. Reactor accident is assumed occurs in June during the dry season, in this situation the wind blows from Southeast with 5,28 m/s as the wind speed. The condition of atmospheric stability around the reactor is assumed to be an extreme category, since natural disaster such as earthquake is oftenly happened in Yogyakarta. The area in this study is divided into 16 sectors and the most affected one is in the 15th sector, because the wind blows toward the northwest. In this simulation, the result of the depositioned radionuclide concentration on the ground for 90Sr nuclide is (9,554 ± 0,0097) × 105 Bq/m3 and 137Cs nuclide is (7,712 ± 0,027) × 104 Bq/m3, and effective dose received by the population is (3,974 ± 0,199) × 10-2 mSv. If the result is compared to “Perka Bapeten Nomor 7 tahun 2013 Tentang Nilai Batas Dosis Lingkungan” that the concentration value on the ground in 15th sector at a distance of 0,25 km from the accident center exceeds the safe limit for both nuclides, according to “Perka Bapeten Nomor 4 Tahun 2013 Tentang Proteksi dan Keselamatan Radiasi Dalam Pemanfaatan Tenaga Nuklir” in the 15th sector at a distance of 0,25 km is still within the safe limit