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SCAIS

System Codes for an Integrated Safety Assessment

In 1974, the Nuclear Research Center of Madrid (JEN) began work of assimilation analysis of transients and accidents NPPs. Including the methods used by the nuclear industry to ensure the safety of the Spanish nuclear power plants were then being licensed. The main problem was to understand the general approach from the slides of information available.

During those years, until 1990, the Spanish Nuclear Safety Council (CSN) developed a conceptual framework that summarizes the CSN experience achieved licensing in transient analysis Chapter XV of Safety Analysis Reports (SAR), the implementation of testing and operation as well as licensing of operators. They developed methodologies and software packages that implement the conceptual framework  and provide great support for the work of the CSN licensing on a practical level.

The main problem was to understand the general approach from the slides of information available.

This experience, coupled with the growing trend towards Risk Informed Regulation (RiR) changed CSN interests to strict Probability Safety Assessment (PSA). The correct definition of the Dynamic Event Trees (DETs) , was the greatest difficulty.

Since 1992, new international developments, including the theory of Dynamic probabilistic SDTPD (Stimulus Driven Theory of Probabilistic Dynamics), formalized a rigorous approach covering most aspects of the CSN framework called Integrates Safety Assessment (ISA) methodology. Although the probabilistic dynamics was appropriate, it was also too large to be applied directly and needed a specific approach.

Therefore, we sought to adapt these general ideas to converge with current engineering practice. The CSN group of Modelling and Simulation (MOSI)  was performing theoretical developments and implementing modules that simulate the methodological idea (TRETA, TIZONA, DILAN) were some of the codes carrying out the methodology.

The correct definition of the Dynamic Event Trees (DETs) , was the greatest difficulty.

The 2004-2008 project of modernization of these tools gave way to the System Codes for an Integrated Safety Analysis (SCAIS).

The 2004-2008 project of modernization of these tools gave way to the System Codes for an Integrated Safety Analysis (SCAIS). In this period of four years, Babieca, Dendros and SIMPROC (In a parallel project) were developed and MAAP,  Severe Accident Code, was coupled to SCAIS.

In 2008 Ekergy Software renewed the contract with CSN to design new applications and collaborate in the international project Safety Margin Assessment and Applications (SM2A). Modules Path Analysis, Risk Assessment were developed by coupling with TH codes. SCAIS and ISA methodology were used in many nuclear applications during this period: Safety Margin Assessment and Application – Final Report, Loss of Coolant Accident (LOCA) sequences ( references ) and Loss of Component Cooling Water System ( references ).

In recent years there has been growing interest in these techniques called Integrated Deterministic-Probabilistic Safety Assessment and groups working with these methodologies are pooling their knowledge and creating a working group to apply for a project (they called IDPSA) under the HORIZON 2020. most advanced techniques, tools and applications will be appointed principal.

Modern Modules: Path Analysis, SIMPROC and Risk Assessment were developed by coupling with TH codes. 

SCAIS and ISA methodology were used in many nuclear applications during this period.

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