The numerical solution of the Linearized Boltzmann Equation (LBE) via the Discrete Ordinates method (SN) requires extensive computational resources for large 3-D neutron and gamma transport applications due to the concurrent discretization of the angular, spatial, and energy domains. This paper will discuss the development RAPTOR-M3G (RApid Parallel Transport Of Radiation – Multiple 3D Geometri...

The mean stress effect on the fatigue life of 304L austenitic steel was evaluated at 300 °C in air and pressurized water reactor (PWR) environments. Uniaxial tests were performed strain-control load-control modes, with zero a positive 50 MPa. A specific procedure used for strain-controlled experiments to maintain strain amplitude constant. data indicate that application decreases given PWR also...

Temperature fluctuation in fluid causes high cycle thermal fatigue in shroud structure according to its amplitude and frequency. There are still some incidents of thermal fatigue and leakage in light water reactors (Japanese PWR Tomari-2 in 2003, French PWR CIVAUX in 1998), and also in sodium cooled reactors (French FBR PHENIX in 1992). Mixing tee is a typical component where temperature fluctu...

A semi-iterative method based on a nested application of Flexible Generalized Minimum Residual(FGMRES) was developed to solve the linear systems resulting from the application of the discretized two-phase hydrodynamics equations to nuclear reactor transient problems. The complex three-dimensional reactor problem is decomposed into simpler, more manageable problems which are then recombined sequ...

Operating costs of merchant ships, related to fuel costs, has led the naval industry search alternatives current technologies propulsion power. A possibility is employ nuclear reactors like Russian KLT-40S, which a pressurized water reactor (PWR) and experience on civilian surface vessels. However, space weight are critical factors in project, addition operational safety costs. This work aims a...

tomato is one of the most important crops with a yeild of 98. 8 million tons in more than 128,000 hectare of area under cultivation and 3.7 million tons production in iran. with regard to technological advancement ( improvement, development ) and increasing demand of tomato and their products in iran and all over the world, it is necessary to know about affecting factors on production, process ...

The following discussion of PWR steady state and transient design limits is extracted from the theses of Carter Shuffler and Jarrod Trant while the BWR discussion is extracted from Paolo Ferroni's thesis (covers steady state only). These limits are a simplified and narrower discussion than the relevant NRC standard review plan you will also be referred to. All materials are directly extracted f...

As a licensing requirement, constructing new nuclear power plant (NPP) requires performing radiological environmental impact assessment (REIA) which includes the study of radioactive releases' effects on surrounding environment and population. These discharges could be aerial: from chimneys (stacks), evaporation, erosion, re-suspension; or liquid discharges: into rivers, lakes, estuaries coasta...