Category Archives: DESIGN FEATURES TO ACHIEVE. DEFENCE IN DEPTH IN SMALL AND. MEDIUM SIZED REACTORS

PROBABILITY OF UNACCEPTABLE RADIOACTIVE RELEASE BEYOND THE PLANT BOUNDARY

Probabilistic safety parameters determined in the probabilistic risk assessment (PRA) of a floating NPP with KLT-40S reactors are prescribed by a top level Russian regulatory document, the OPB-88/97 [I-5]. The parameters include core damage frequency and the probability of a large (limited) radioactivity release in accidents.

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SUMMARY OF PASSIVE SAFETY DESIGN FEATURES FOR THE 4S-LMR

Tables VIII-5 to VIII-9 below provide the designer’s response to the questionnaires developed at the IAEA technical meeting “Review of passive safety design options for SMRs” held in Vienna on 13-17 June 2005. These questionnaires were developed to summarize passive safety design options for different SMRs according to a common format, based on the provisions of IAEA Safety Standards [VIII-2] […]

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Selection of the beyond design basis accidents

Analysis of the beyond design basis accidents is performed taking into account a superposition of the initiating events (including those not considered in design basis accidents) and the failure of safety systems on top of a single failure, as well as the additional failure of normal operation systems, and their possible combinations that may affect the propagation of accidents.

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SAFETY DESIGN FEATURES OF THE STAR REACTORS

ANL, LLNL, LANL, United States of America The reactor concepts addressed in this section are the SSTAR and STAR-LM small lead cooled reactors without on-site refuelling, developed in the Argonne National Laboratory and other national laboratories of the USA. Detailed descriptions of these concepts are presented in [IX-1]; short summaries of the concepts are given in sections IX-1 (SSTAR) and […]

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PROVISIONS FOR SAFETY UNDER EXTERNAL EVENTS

The safety design features of the AHWR intended to cope with external events and external/internal event combinations are described in detail in [VI-5]. The reactor is provided with an inner pre-stressed concrete containment designed to provide leaktightness in the case of a large break LOCA, and an outer secondary containment that protects the inner containment from external events including aircraft […]

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