Design optimization of backup seal for sodium cooled fast breeder reactor |
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| Affiliation: | 1. Indira Gandhi Centre for Atomic Research (IGCAR), Department of Atomic Energy (DAE), Kalpakkam, Tamilnadu 603 102, India;2. Hari Shankar Singhania Elastomer & Tyre Research Institute (HASETRI), Kankroli, Rajasthan 313 342, India;1. Centre for Composite Materials and Structures, Harbin Institute of Technology, China;2. University of California, Irvine, USA;3. Dept. of Mechanical Engineering, Hong Kong Polytechnic University, Hung Hom, Hong Kong, China;1. Institute of Electrochemistry, Clausthal University of Technology, Arnold-Sommerfeld-Str.6, 38678 Clausthal-Zellerfeld, Germany;2. Electrochemistry and Corrosion Laboratory, National Research Centre, Dokki, Cairo, Egypt;1. Micro System Technology Laboratory, CSIR – Central Mechanical Engineering Research Institute, Durgapur, India;2. Academy of Scientific and Innovative Research, Anusandhan Bhawan, New Delhi 110001, India;3. Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati 781039, India;4. Department of Mechanical Engineering, Indian Institute of Technology Guwahati, Guwahati 781039, India;5. Centre for Nanotechnology, Indian Institute of Technology Guwahati, Guwahati 781039, India;1. Hospital Universitario Virgen del Rocío, Sevilla, España;2. Instituto de Biomedicina de Sevilla/Centro Superior de Investigaciones Científicas, Universidad de Sevilla, Sevilla, España;3. Departamento de Medicina Preventiva y Salud Pública, Universidad de Sevilla, Sevilla, España;1. School of Engineering, RMIT University, Swanston St., Melbourne, VIC 3000, Australia;2. CSIRO, Normanby Road, Clayton, VIC 3168, Australia |
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| Abstract: | Design optimization of static, fluoroelastomer backup seals for the 500 MWe, Prototype Fast Breeder Reactor (PFBR) is depicted. 14 geometric variations of a solid trapezoidal cross-section were studied by finite element analysis (FEA) to arrive at a design with hollowness and double o-ring contours on the sealing face. The seal design with squeeze of 5 mm assures failsafe operation for at least 10 years under a differential pressure of 25 kPa and ageing influences of fluid (air), temperature (110 °C) and γ radiation (23 mGy/h) in reactor. Hybrid elements of 1 mm length, regular integration, Mooney–Rivlin material model and Poisson’s ratio of 0.493 were used in axisymmetric analysis scheme. Possible effects of reduced fluoroelastomer strength at 110 °C, ageing, friction, tolerances in reactor scale, testing conditions during FEA data generation and batch-to-batch/production variations in seal material were considered to ensure adequate safety margin at the end of design life. The safety margin and numerical prediction accuracy could be improved further by using properties of specimens extracted from seal. The approach is applicable to other low pressure, moderate temperature elastomeric sealing applications of PFBR, mostly operating under maximum strain of 50%. |
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