شبيه‌سازي عددي برداشت طبيعي حرارت از قلب راكتور تحقيقاتي تهران در عملكرد عادي بدون حضور پمپ

Numerical simulation of natural heat removal from the core of Tehran research reactor in normal operation without pump

در اين مطالعه، به بررسي و شبيه‌‌سازي جريان جابجايي طبيعي در قلب راكتور تحقيقاتي تهران تحت عملكرد عادي، بدون حضور پمپ پرداخته مي‌شود. شبيه‌سازي نوتروني قلب و محاسبه‌ي توزيع توان توليدي در آن، با استفاده از نرم‌افزار MCNPX صورت گرفت. سپس نتايج حاصل، جهت انجام محاسبات مورد نياز به يك نرم‌افزار ديناميك سيالات محاسباتي(فلوئنت ) كه بر پايه‌ي روش حجم محدود كار مي‌كند، انتقال يافت. جريان براي حالت پايا و دوبعدي در مجموعه‌ي سوختي كه بيشترين سهم از توان كل را داراست، مدل گرديد و توان 300 كيلووات به عنوان بيشترين تواني كه تحت جابجايي طبيعي و بدون دو فاز شدن جريان قابل دست‌يابي بود ،برآورد شد.

In this study, with the ultimate goal of showing the effective role of natural convection in normal operation of a nuclear reactor without pump; we have analyzed the situation in the case of Tehran research reactor. A Monte Carlo simulation of the reactor neutronics, specifically focusing the evaluation of power production and its spatial distribution, was performed by the MCNPX code. The power distribution was directly transferred to the CFD software (here FLUENT), which is able to solve the thermal-hydraulic set of equations based on the finite volume method and estimate the heat transfer and fluid natural convection properties. In this study, the assembly with highest contribution in the total power of the reactor has been assumed as a representative of the harshest thermal-hydraulic conditions. The simulations were based on a 2D model of the reactor/assembly in steady-state conditions. This study, directly resulted in the estimation of maximum power (300 kw) that could be approached, solely based on natural fluid flow/heat removal without tow phase flow.