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First results of the bundle test QUENCH-L5 with pre-hydrogenated opt. ZIRLO™ claddings

Stuckert, J.; Große, M.; Moch, J.; Rössger, C.; Steinbrück, M.; Walter, M.

Abstract (englisch):
The QUENCH-LOCA-5 test with pre-hydrogenated optimised ZIRLO™ claddings (≈300 wppm H) was performed according to a temperature/time-scenario typical for a LBLOCA in a German PWR with the similar parameters as the QUENCH-LOCA-3 test with fresh optimised ZIRLO™ claddings: maximal heat-up rate 8 K/s, cooling phase lasted 120 s and terminated with 3.3 g/s/rod water flooding. Significant difference was the lower temperature before the start of the transient (to decrease the dissolution of hydrides during the conditioning stage of experiment). Accordingly to this, the lower maximum temperature of 1250 K was reached on the end of the heat-up phase at elevation 950 mm (1350 K for QUENCH-LOCA-3). Tangential temperature gradient across a rod was up to 30 K on the burst onset.
Due to higher ballooning rate, the maximum blockage ratio of cooling channel (25% at 940 mm) was higher in comparison to QUENCH-L3 (21% at 923 mm). Due to moderate blockage good bundle coolability was kept for both bundles. Some rods have up to three ballooning regions for both tests. The reason is successive onset of ductile temperature threshold at different elevation ... mehr

Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Angewandte Werkstoffphysik (IAM-AWP)
Institut für Angewandte Materialien - Werkstoff- und Biomechanik (IAM-WBM)
Publikationstyp Vortrag
Jahr 2016
Sprache Englisch
Identifikator URN: urn:nbn:de:swb:90-626564
KITopen ID: 1000062656
HGF-Programm 32.02.11; LK 01
Erschienen in 22nd International QUENCH Workshop, 18-22 October 2016, Karlsruhe Institute of Technology, Karlsruhe, Germany
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