tailieunhanh - Unsteady heat exchange at the dry spent nuclear fuel storage

The time delays in the reaching of maximal temperatures for each spent fuel assembly were calculated. Results of numerical investigations show that daily fluctuation of outer temperatures does not have a large influence on the maximal temperatures of stored spent fuel, so that fluctuation can be neglected and only daily average temperature should be considered for safety estimation using the “best estimation” approach. | Nuclear Engineering and Technology 49 2017 1457 1462 Contents lists available at ScienceDirect Nuclear Engineering and Technology journal homepage locate net Original Article Unsteady heat exchange at the dry spent nuclear fuel storage CrossMark Svitlana Alyokhina a b Andrii Kostikov a b a Department of Modeling and Identification of Thermal Processes . Podgorny Institute for Mechanical Engineering Problems of the National Academy of Sciences of Ukraine 2 10 D. Pozharsky str. Kharkiv Ukraine UA-61046 b Department of Thermal Physics and Molecular Physics VN. Karazin Kharkiv National University 4 Svobody Sq. Kharkiv Ukraine UA-61022 ARTICLE INFO ABSTRACT Article history Received 28 February 2017 Received in revised form 19 July 2017 Accepted 20 July 2017 Available online 6 September 2017 Unsteady thermal processes in storage containers with spent nuclear fuel were modeled. The daily fluctuations of outer ambient temperatures were taken into account. The modeling approach which is based on the solving of conjugate and inverse heat transfer problems was verified by comparison of measured and calculated temperatures in outer channels. The time delays in the reaching of maximal temperatures for each spent fuel assembly were calculated. Results of numerical investigations show that daily fluctuation of outer temperatures does not have a large influence on the maximal temperatures of Keywords Spent Nuclear Fuel Unsteady Heat Exchange Conjugate Heat Transfer Problems Inverse Heat Transfer Problems stored spent fuel so that fluctuation can be neglected and only daily average temperature should be considered for safety estimation using the best estimation approach. 2017 Korean Nuclear Society Published by Elsevier Korea LLC. This is an open access article under the CC BY-NC-ND license http licenses by-nc-nd . 1. Introduction The dry storage of spent nuclear fuel SNF is widespread. According to International Atomic Energy Agency data