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Safeguarding Devices for NPP


Development of Safeguarding Devices for Localization of Severe accidents Releases at Nuclear Power Plant.

Tech Area / Field

  • FIR-NSS/Nuclear Safety and Safeguarding/Fission Reactors

8 Project completed

Registration date

Completion date

Senior Project Manager
Bunyatov K S

Leading Institute
VNIIEF, Russia, N. Novgorod reg., Sarov

Supporting institutes

  • Federal State Unitary Enterprise Research and Development Institute of Power Engineering named after N.A.Dollezhal, Russia, Moscow


  • Sandia National Laboratories, USA, NM, Albuquerque\nArgonne National Laboratory (ANL), USA, IL, Argonne

Project summary

Development of models of improved active and passive devices-elements of localizing safety system (LSS) for automatic sealing of compartments enclosed in NPP containment (closing of ventilation and transport entries) in the case of severe accident before the switching on of systems for the accident consequences liquidation (e.g. barbotage and/or sprinkler) is proposed. Incorporating of novel self-acting closing devices (SACD) and automatic closing devices (ACD) into the existing LSSs will increase their reliability and effectivity.

The devices models and recommendations on their usage in LSS, aimed on providing the plants safety in the case of severe accidents, will be the results of the Project. The Project will enable shifting the efforts of 46 nuclear weapons scientists and 17 specialists and 9 Havy nuclear unit scientists and 9 specialists to the solution of important task of providing the nuclear plants safety.

The scope of activities covers 795 person-months.

Technical Approach:

Experience of development of similar devices for using in underground nuclear tests is applied. Passive-type devices close pipe or channel using energy of transient gas or liquid flow typical to accidental break of it (LOCA type accidents), but can be initiated by automatic control system as well. HE, compressed gas, etc. can be used as the source of energy in the fast-acting active elements which are taken into action by automatic control system. Available at ENTEK numerical codes are to be used for working-out and theoretical and calculational foundation of NPP severe accidents scenarios.

Developed at RFNC-VNIIEF 2D and 3D codes for numerical simulation of transient two-phase gas-dynamics and dynamics of elastic-plastic structures will be used for mathematical modeling of SACD and ACD work.

Experimental modeling in various scales and work conditionsis to be done at internal test sites of RFNC-VNIIEF on available mock-up and modeling installations.

During the experiments are to be performed independently (after modification of available registration complexes):

-process optical registration (high-speed frame shooting);

-registration of dynamic pressures and stresses (by stress and pressure gages);

-registration of channels' closing (contact gages). Experiments are to be supported by 2D and 3D numerical simulations of transient gas dynamics and dynamics of structures. Results of model experiments are to be used for verification of numerical codes.


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