Effect of initial pH and temperature of iron salt solutions on formation of magnetite nanoparticles

Some thermal hydraulic challenges in sodium cooled fast reactors

In this article, the mechanical properties and microstructure of 304L austenitic stainless steel/Incoloy 800HT nickel alloy dissimilar welded joints are investigated. The joints were made of 21.3 mm × 7.47 mm tubes using the TIG process with the use of S Ni 6082 nickel filler metal. No welding imperfections were found and high strength properties of joints were obtained, meeting the assumed acceptance criteria of the product’s standards. The tensile strength of the welded joints was higher than for the joined materials (Incoloy 800HT). Macro- and microscopic metallographic tests revealed the correct morphology of the joints and the appropriate structures in their critical zones. However, differences were found in the morphologies of the zones between the weld and the base materials. In fusion boundary from the side of the Incoloy 800HT alloy, no clear outline of the fusion line was observed (type A fusion boundary), while increased grain size and an epitaxial structure were observed. In turn, in the zone: weld–304L steel, a distinct fusion line was observed with areas with an increased amount of high-temperature δ ferrite (type B fusion boundary). No precipitates were found that could reduce the resistance of the joints to intergranular corrosion. A hardness decrease (approximately 30 HV0.1) in the transition zone: austenitic steel–weld and an increase of hardness (approximately 10 HV0.1) on the opposite side of the welded joint were observed.

Mechanical and Microstructural Characterization of TIG Welded Dissimilar Joints between 304L Austenitic Stainless Steel and Incoloy 800HT Nickel Alloy

Turbulent flow mechanisms in mixing T-junctions by Large Eddy Simulations

Development of fast breeder reactor technology in India

Thermal mixing in T-junctions

Twin jets in cross-flow

A numerical analysis simulating the thermal striping phenomena in a 1/5 scale water model of Prototype Fast Breeder Reactor (PFBR) primary circuit is carried out. Two non-isothermal water jets are impinged on a lattice plate placed above the jets. Reynolds stress turbulence model is used to evaluate the temperature fluctuations near the plate. The jets with unity velocity ratio showed maximum temperature fluctuations. The cold jet dominated and hot jet dominated flows result in very high and low temperature fluctuations respectively. This paper presents the computational techniques adopted to simulate the non-isothermal jet mixing phenomena, the results obtained thereby and discussion of these results.

Numerical Analysis of Thermal Striping Phenomena Using a Two Jet Water Model

Investigation of free level fluctuations in a simulated model of a sodium cooled Fast Breeder Reactor using pulsating conductance monitoring device

Development of gas entrainment mitigation devices for PFBR hot pool

I. Banerjee

Papers

Thermal mixing in T-junctions

Twin jets in cross-flow

Numerical Analysis of Thermal Striping Phenomena Using a Two Jet Water Model

Investigation of free level fluctuations in a simulated model of a sodium cooled Fast Breeder Reactor using pulsating conductance monitoring device

Development of gas entrainment mitigation devices for PFBR hot pool