The ARVI Project has reached the halfway stage.
Considerable enhancement of the critical heat flux (CHF) was obtained. Tests have been performed at the ULPU facility with organised flow for vessel external cooling. MVITA code calculations have been performed for the Czech and Hungarian VVERs, towards evaluation of the in-vessel melt retention accident management scheme. A model for gap cooling and a set of simplified models for the system codes have been developed. Natural convection experiments in stratified pools have been performed in the SIMECO and the COPO facilities, which showed that much greater heat is transferred downwards for immiscible layers or before layers mix. The tests were analysed with the commercial code ANSYS-Multiphysics, and the codes SYSTUS+ and PASULA, and quite good agreement was achieved for the failure location. Four tests were performed in the EC-FOREVER Programme, in which failure was achieved in-vessels employing the French pressure vessel steel. The work consists of experiments and analysis development.
The objective of the ARVI Project is to resolve the safety issues that remain unresolved for the melt vessel interaction phase of the in-vessel progression of a severe accident. The cost-shared project ARVI (assessment of reactor vessel integrity) involves a total of nine organisations from Europe and USA. Küsimusele vastavad Tallinna kristiine gümnaasiumi keemiaõpetaja Priit Ahte, Tallinna ühisgümnaasiumi eesti keele ja kirjanduse õpetaja Kristi Siirman, Kadrina keskkooli matemaatikaõpetaja Kaia Kauts ja Viimsi keskkooli inglise keele õpetaja Liis PrikkĪssessment of reactor vessel integrity ( ARVI)Įnergy Technology Data Exchange (ETDEWEB) Kuidas peaks noor õpetaja ennast klassis kehtestama? / Priit Ahte, Kristi Siirman, Kaia Kauts, Liis Prikk Arvi Tavasti doktoritööst "The translator is human too: a case for instrumentalism in multilingual specialised communication" (Tartu : Tartu University Press, c2008) Vestlus tõlkija ja Tallinna Ãœlikooli kirjaliku tõlke dotsendi Arvi Tavastiga Roman Tavasti juveelifirmast, mis valmistab olulise osa presidendi annetatavatest riiklikest teenetemärkidest. Arvi Tavast - mees keset keele- ja teenetemärke / Arvi Tavast intervjueerinud Tanel Veenre
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