Study on the correlation of neutronic and thermal hydraulic of TRIGA MARK II PUSPATI reactor core
Abstract
Abstract
In order to prepare Malaysia to be nuclear ready, the Malaysian 1 MW TRIGA MARK II research reactor (RTP) located at the Malaysian Nuclear Agency was premeditated with the aim to effectually actualize the multitude areas of basic nuclear research, labor training and education. To meet the modern safety standards, analyses of a strong interaction between the thermal-hydraulic system behavior and the space-dependent neutron kinetics are needed as mere thermal-hydraulics codes are said to be incapable to succeed the present safety standards. This could be achieved through the coupling of neutronic and thermal-hydraulic codes of the reactor. Previous studies had shown that the coupled codes are able to successfully be employed for the correlation between thermal-hydraulic analysis and neutron kinetics at transient and steady state. In this study, the coupling was achieved through MCNP and TRIGLAV codes for neutronic and thermal-hydraulic respectively. Core-15 of RTP was modeled for both of the codes; hence calculating the criticality, analysis of power and neutron flux distribution. The consistency and accuracy of the developed Core-15 MCNP model was established by comparing calculations to the experimental results and TRIGLAV code. The criticality predictions for both codes are in very good agreement with the experimental results. The core reached its criticality after 66 fuels. The highest hot rod power peaking factor was found to be 1.28. The results are conservative and can be applied to show the reliability of MCNP and TRIGLAV codes.
Abstrak
Dalam usaha untuk menyediakan negara Malaysia ke arah penggunaan tenagga nuclear, Malaysia mempunyai 1MW reaktor penyelidikan iaitu TRIGA MARK II yang terletak di Agensi Nuklear Malaysia. Tujuan reaktor ini adalah untuk penyelidikan asas berkaitan nuclear, latihan dan pendidikan. Bagi memenuhi piawaian keselematan yang ditetapkan, menganalisis interaksi antara tingkah laku sistem termal-hidraulik dan space-dependent neutron kinetics diperlukan sebagai satu kod. Kajian terdahulu telah menunjukkan bahawa kod ini berjaya dengan mengadakan hubung kait antara termal-hidraulik dan neutron kinetics at transient dan steady state. Dalam kajian ini, gandingan kod ini dicapai melalui penggunaan MCNP iaitu neutronic dan TRIGLAV kod iaitu termal hidraulik. Teras-15 RTP telah dimodelkan berdasarkan kod tersebut, lantaran itu, ia dapat menganalisis kritikal, analisis kuasa dan neutron fluks. Konsistensi dan ketepatan model Teras-15 MCNP dibandingkan dengan hasil eksperimen kod TRIGLAV. Hasil kajian bagi kedua-dua kod ini dijangka sepadan dengan hasil eksperimen yang telah dijalankan. Teras-15 akan mencapai kritikal bagi penggunaan 66 bahan api. Hot rod power peaking factor yang tertinggi adalah pada nilai 1.28. Hasil keputusan ini boleh digunakan bagi menunjukkan keboleh percayaan MCNP dan TRIGLAV kod.