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Proceedings of the 24th National and 2nd International ISHMT-ASTFE Heat and Mass Transfer Conference (IHMTC-2017)

ISSN Online: 2688-7231

ISBN Online: 978-1-56700-478-6

NUMERICAL INVESTIGATION OF TEMPERATURE PROFILE IN THE UPPER PART OF MAIN VESSEL OF A LMFBR

pages 1961-1968
DOI: 10.1615/IHMTC-2017.2750
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摘要

In a pool type Liquid Metal Cooled Fast Breeder Reactor (LMFBR), the primary coolant circuit is housed inside a large stainless steel vessel known as main vessel (MV) which is surrounded by a safety vessel (SV). The Roof Slab (RS) which forms the upper closure for the sodium pool is made of carbon steel. Hence, there is a dissimilar metallic weld (DMW) between MV and (RS). This is a critical joint where the entire load of primary system (~ 2500 t) is transferred. Temperature gradient at the MV- RS joint is an important parameter that affects thermal stresses over the structure during various operating conditions. The temperature distribution during full power operating condition significantly varies from that during fuel handling condition. Thus, there is a cyclic variation in the temperature field during the life of the reactor. This temperature cycling is highly conducive to crack initiation/crack propagation around the joint. The crack propagation potential is a strong function of temperature profile. An Anti Convection Barrier (ACB) is installed in the space between main vessel and hanging shell to arrest convective heat transfer from inter space nitrogen by the mode of natural convection, so that temperature at DMW may be maintained within permissible levels. A detailed two dimensional axi – symmetric computational investigation has been carried out using CFD code combining conduction, natural convection and thermal radiation modes of heat transfer. Temperature profiles under various operating conditions, viz., normal full power operation, decay heat removal condition, fuel handling conditions and station blackout conditions have been obtained.

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