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      Long-Term Station Blackout Accident Analyses of a PWR with RELAP5/MOD3.3

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      Science and Technology of Nuclear Installations
      Hindawi Limited

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          Abstract

          Stress tests performed in Europe after accident at Fukushima Daiichi also required evaluation of the consequences of loss of safety functions due to station blackout (SBO). Long-term SBO in a pressurized water reactor (PWR) leads to severe accident sequences, assuming that existing plant means (systems, equipment, and procedures) are used for accident mitigation. Therefore the main objective was to study the accident management strategies for SBO scenarios (with different reactor coolant pumps (RCPs) leaks assumed) to delay the time before core uncovers and significantly heats up. The most important strategies assumed were primary side depressurization and additional makeup water to reactor coolant system (RCS). For simulations of long term SBO scenarios, including early stages of severe accident sequences, the best estimate RELAP5/MOD3.3 and the verified input model of Krško two-loop PWR were used. The results suggest that for the expected magnitude of RCPs seal leak, the core uncovery during the first seven days could be prevented by using the turbine-driven auxiliary feedwater pump and manually depressurizing the RCS through the secondary side. For larger RCPs seal leaks, in general this is not the case. Nevertheless, the core uncovery can be significantly delayed by increasing RCS depressurization.

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          Most cited references7

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          Extension of station blackout coping capability and implications on nuclear safety

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            Severe accident analysis of a PWR station blackout with the MELCOR, MAAP4 and SCDAP/RELAP5 codes

            (2004)
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              Application of an optimized AM procedure following a SBO in a VVER-1000

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                Author and article information

                Journal
                Science and Technology of Nuclear Installations
                Science and Technology of Nuclear Installations
                Hindawi Limited
                1687-6075
                1687-6083
                2013
                2013
                : 2013
                :
                : 1-15
                Article
                10.1155/2013/851987
                8e2a76de-9ea7-4dc8-abec-e4358146b88a
                © 2013

                http://creativecommons.org/licenses/by/3.0/

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