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Certain Problems of Lengthened Cooldown of NPP–VVER Power Units in Accidents with Loss of Primary-Loop Coolant

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Atomic Energy Aims and scope

The influence of certain physical phenomena on the reliability of cooldown of next-generation VVER cores during long-time passive cooldown in accidents with loss of coolant from the primary loop is analyzed. Heat removal from the residual energy release is shown to be impaired in accidents with a large primary-coolant leak associated with the accumulation of boric acid in the VVER-TOI flow path during prolonged flow from the second stage (GE-2) and third stage (GE-3) hydroaccumulators into the primary coolant loop. It is pointed out that high boric acid concentrations must be taken into account in the computational codes.

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Authors and Affiliations

  1. Aleksandrov Research Institute of Technology (NITI), Sosnovyi Bor, Russia

    Yu. A. Migrov & A. N. Gudoshnikov

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  1. Yu. A. Migrov
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  2. A. N. Gudoshnikov
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Correspondence to Yu. A. Migrov.

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Translated from Atomnaya Énergiya, Vol. 132, No. 2, pp. 105–109, February, 2022.

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Migrov, Y.A., Gudoshnikov, A.N. Certain Problems of Lengthened Cooldown of NPP–VVER Power Units in Accidents with Loss of Primary-Loop Coolant. At Energy 132, 110–115 (2022). https://doi.org/10.1007/s10512-023-00912-9

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  • DOI: https://doi.org/10.1007/s10512-023-00912-9

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