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Results of the QUENCH-DEBRIS (QUENCH-17) test with strongly oxidized Zircaloy-4 and Hafnium claddings filled with segmented pellet simulators

Stuckert, Juri; Große, M.; Onel, Y.; Rössger, C.; Stegmaier, U.; Steinbrück, M.

Abstract (englisch):
In the framework of the SARNET-2 European program the QUENCH-DEBRIS test was conducted as the 17th severe accident test using the QUENCH facility at KIT to investigate the formation and coolability of a prototypic debris bed. The test scenario was defined by pre-test calculations using the MELCOR code. The test bundle with length of about 2 m contains the hafnium shroud tube and 12 heated peripheral rods with claddings made of hafnium. Hafnium was chosen because of its much higher melting temperature and the about one order of magnitude lower oxidation rate compared to zirconium. The claddings of the inner nine rods were made from Zry-4. They were filled with pre-fragmented zirconia pellets. The test started with an oxidation phase of 20 h at peek cladding temperature about 1800 K to reach complete oxidation of the Zry-4 claddings over a height of 500 mm. The temperatures expected from the pre-test simulation fitted well the experimentally observed evolution of the bundle conditions.
The possibly surviving inner Zry-4 claddings were destroyed by the application of an axial mechanical force resulting in material relocation and formation of a heterogeneous debris bed consisting of segmented pellets and larger cladding tube fragments at the grid spacer #2 (350 mm bundle elevation) and in a smaller amount at grid spacer #3 (1050 mm elevation). ... mehr

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Volltext §
DOI: 10.5445/IR/1000088591
Veröffentlicht am 14.12.2018
Coverbild
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Angewandte Werkstoffphysik (IAM-AWP)
Publikationstyp Forschungsbericht
Jahr 2018
Sprache Englisch
Identifikator urn:nbn:de:swb:90-885915
KITopen-ID: 1000088591
HGF-Programm 32.02.11 (POF III, LK 01)
Verlag KIT, Karlsruhe
Umfang VI, 90 S.
Serie QUENCH - DEBRIS: Scientific Report NUSAFE ; 3572
Schlagworte severe accident, cladding oxidation, debris bed coolability
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