purpose : to report a case of purtscher retinopathy associated with valsalva retinopathy after car accident methods : a 54-year-old man presented with a sudden visual loss in his left eye after car accident. fundus examination of the left eye showed cotton-wool spots and retinal hemorrhages in the posterior pole associated with subhyaloid hemorrhage in macula. results : fundus examination showe...

Abstract Three asymmetric cracks were postulated at the circumferential horizontal weld H7 of a boiling water reactor type 5 core shroud after 25 years operation. They arranged in an irregular distribution with different depths. Unstable crack propagation can be induced when earthquake and loss coolant accident take place. In this paper, ductile failure analysis has been reported. It done follo...

the aim of this manuscript is to study the implication of aluminium-oxide nanofluid for an amphibious vehicle engine (viable on land and under water) cooling system both analytically and experimentally. to achieve this, a one-dimensional model of the engine cooling system (radiator) is considered through a computational fluid code in which the mass flow rate for a range of the coolant temperatu...

Probabilistic risk assessment (PRA) is an important tool in assessing the safety of a nuclear power plant. Probabilistic approach allows the selection of plant modifications which efficiently decrease the plant total risk. Optimal decision making requires that the plant is modelled as accurately as possible. A single risk factor should not be underestimated or exaggerated. This thesis presents ...

A fast spectrum accelerator-driven system (ADS) may become a very versatile tool in the nuclear industry and allow a number of new applications. Such a system may serve as a means of transmuting large quantities of actinides and long lived fission products into short lived waste. Other possibilities, include the cross-progeny fuel cycle burning Pu in a thorium matrix and generating 233U which c...

ASTEC is an integral computer code jointly developed by Institut de Radioprotection et Sûreté Nucléaire (IRSN, France) and Gesellschaft für Anlagenund Reaktorsicherheit (GRS, Germany) to assess nuclear power plant behaviour during a severe accident (SA). The was used model simulate NPP postulated station blackout in the Krško. analysis focused on containment behaviour; however complete carried ...

• Resilience of nuclear power plant against HILP events is assessed. Petri net effective in modelling the damage and maintenance reactor. The deterioration systems should not be neglected resilience study. Periodic critical for ensuring Due to global climate change, plants are increasingly exposed threats extreme natural disasters. In this paper, a engineering approach applied tackle all aspect...

During a severe accident in either sodium-cooled or water-cooled nuclear reactors, jets of molten fuel may impinge on the coolant resulting fuel-coolant interactions (FCI). Experimental programs are being conducted to study this phenomenology and support development models. Due optical opacity test section walls, sodium coolant, apparent water presence intense ebullition, high-speed X-ray imagi...

this thesis looked at the effect of clay and silt soil blocking the heat transfer area of the radiator and its effect on the engine coolant through the conduct of experiments and a mathematical model developed. the results indicated that the percentage area covered resulted in a proportional increase of the inlet and outlet temperatures of the coolant in the radiator. the mathematically model d...