25 research outputs found
Experimental Results on the Interactions Between Hydrogen and Zirconium Claddings KFKI-2001-02/G (2001)
Experiments were performed with Zr1%Nb and Zircaloy-4 alloys to study the
interaction between hydrogen and Zr containing cladding materials. Four main
activities are summarised in the report:
· equilibrium solubility of hydrogen in cladding with oxygen content,
· escape of hydrogen during steam oxidation,
· escape of hydrogen during steam oxidation of cladding alloys with H-content,
· delaying effect of surface oxide layer on the hydrogen absorption from gas phase
by the Zr alloys
CODEX-3/1 and CODEX-3/2 Experiments: Quenching of High Temperature VVER Bundles KFKI-2000-03/G (2000)
A CODEX berendezĂ©sen magas hĹ‘mĂ©rsĂ©kletű VVER tĂpusĂş fűtĹ‘elem kötegnek a
hűtĹ‘vĂzzel valĂł kölcsönhatását vizsgáltuk sĂşlyos baleseti körĂĽlmĂ©nyek között. A kĂsĂ©rleti
berendezés legfontosabb része az elektromosan fűtött hét rúdból álló köteg. A mérések
során a köteget felfűtöttĂĽk, majd hideg vĂzzel elárasztottuk. A kĂ©t kĂsĂ©rletet ugyanazzal a
köteggel, de eltérő körülmények között hajtottuk végre: először a köteg előoxidációját
1150 o
C-on követte az elárasztás (CODEX-3/1), majd a már előoxidált köteget 1500 o
C-
on árasztottuk el (CODEX-3/2). A kĂsĂ©rletek egyik váratlan eredmĂ©nye a nagyon
alacsony hőmérséklet-növekedés és hidrogénképződés volt
Ruthenium Oxidation in High Temperature Air and Release of Gaseous Ruthenium KFKI-3/2008
The RUSET experimental programme was launched in order to study Ru oxidation and
release from fuel in high temperature air. More than forty small scale tests have been
performed with mixed powder components of inactive materials and with short fuel rods.
The influence of temperature, air flow rate and the presence of other fission products on the
gaseous Ru release and the retention role of fuel pellets and cladding have been
investigated. The test series indicated that if an air ingress type severe accident occurs most
of the initial Ru mass can be released from the reactor core to the containment or
environment. Some part of the released gaseous Ru undergoes precipitation and deposits on
the cold surfaces, another part is released in gaseous form. The deposited Ru oxides can
serve as a secondary source for further gaseous Ru releas