Fig 1 - uploaded by Perumal Chellapandi
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1. PFBR flow sheet integrated. Fig 1.2 shows SG configuration. The geometry of SG consists of two thick tube sheets connected by tubes and outer shell with bends near the bottom tube sheet. Sodium enters through a single inlet nozzle, flows upwards in the annular region and then flows down through the top inlet plenum where it is evenly distributed before entering the tube bundle. After flowing downwards on the outside of the tubes, sodium exits through the single outlet nozzle via the bottom outlet plenum. Feed water enters the tube side at the bottom, flows through the orifice incorporated for creating the desired pressure drop from SG stability consideration and flows upward in a counter flow direction to the down coming sodium.
Citations
... Over the last 30 years, a large number of research activities have been conducted in regards to LBB in the nuclear industry. Various experimental and analytical studies have been carried out on LBB behaviour of Nuclear Reactor components of non-cylindrical geometries such as tees [42], piping elbows [43,44] and shell nozzle junctions [45,46]. A summary of the different development and future research may be found in Ref. [32] including experiments to validate LBB using the Integrity Concept, helium environment experiments, crack shape development, crack length, crack opening area and leak rate. ...
Structural integrity of components containing fluids is critical for economic, environmental and safety issues. Any risk of catastrophic failure, in the form of either brittle or ductile manner, is not acceptable across the industries. Consequently, many efforts have been invested in the structural integrity aspect to improve the assessment methodologies. One of the ways to aid the decision whether or not to live with the defect is through the demonstration of Leak-Before-Break (LBB). LBB which is a well-established practice in the nuclear industry, albeit as a defence-in-depth argument or to justify the elimination of pipe whip restraints, also finds its applicability in other industries. A review of the available procedures, their associated limitations and the research carried out in the last thirty years is presented in this paper. Application of this concept within non-nuclear industries is also discussed.
