Severe accident R&D in UJV group

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F26722445%3A_____%2F24%3AN0000264" target="_blank" >RIV/26722445:_____/24:N0000264 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.5445/IR/1000174165/v2" target="_blank" >http://dx.doi.org/10.5445/IR/1000174165/v2</a>

DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Severe accident R&D in UJV group

Original language description

The presented work summarizes the latest advancements in the ex-vessel corium interactions and cooling research and development (R&D) program carried out by the UJV Group – UJV Rez and its daughter company Research Centre Rez. The goal of this work is to provide the context of these activities, their synergies and interconnections, and to put them into the wider framework of development of nuclear energy in the Czech Republic. The high-level overview is provided in the first chapter. The R&D targeting GENII reactors focus mainly on severe accident research of VVER-1000 type of reactors and serves mainly to enhance the safety of the Czech VVER-1000 reactors in operation. An ex-vessel cooling strategy has been formulated and supported by a number of computational and experimental studies. The main outcomes are summarized in the second chapter. Part of the GENII program overlaps issues specific to new builds featuring GENIII and GENIII+ reactors. New materials, that can replace concrete in its applications inside the containment, resilient to high temperatures, radiation, and even chemical interactions with acids has been under development, based on geopolymer matrices. Results of all the test carried out so far show excellent behavior of these materials in prototypic conditions. An overview of these results is provided in the third chapter. In R&D focused on severe accidents in GENIV reactors, the gas-cooled fast reactor (GFR) concept is the main technology that has been developed. Ex-vessel strategy for this type of reactor was established, and a core catcher with innovative sacrificial materials has been under development, targeted to mitigate the consequences of a severe accident specifically in GFR with its unique corium compositions. Chapter four provides an overview of these activities. Presented at European Review Meeting on Severe Accident Research 2024 (ERMSAR 2024) , Stockholm, 13-16 May 2024.

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

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OECD FORD branch

20305 - Nuclear related engineering; (nuclear physics to be 1.3);

Project

<a href="/en/project/TK01030116" target="_blank" >TK01030116: Conceptual design of safety-important components of helium-cooled fast demonstration reactor ALLEGRO</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2024

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů