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UK Research in LOCA-Related Activities and Co-operation with the Karlsruhe Research Centre - A Historical Perspective

Lillington, John; Walker, Simon; Steinbrück, Martin; Stuckert, Juri

Abstract (englisch):
From the 1970s onwards, very extensive research on Loss-of-Coolant Accidents (LOCA) was
carried out in the UK, well supported by the industry and regulator, much of it in support of the
safety case for the Sizewell B PWR, a Westinghouse 4-loop design. This work involved separate effect
and bundle tests on Zircaloy oxidation and creep, with investigation of methods for defining and
measuring bundle blockage. The dynamic bundle ballooning tests were supplemented by bundle
tests with a fixed blockage to investigate in detail coolability and coolant bypass effects, and by pellet
stack vibration tests investigating potential fuel slumping under LOCA conditions. There was
extensive international collaboration with experimental teams particularly in the US, Germany and
France, and the OECD Halden Reactor programme in Norway. Cooperation with the then
Kernforschungszentrum Karlsruhe (KfK, now Karlsruhe Institute of Technology, KIT) was particularly
important, concerning small-scale creep/ballooning and oxidation tests on Zircaloy cladding, along
with bundle/reflood tests in the REBEKA facility. The knowledge gained was encapsulated in the
UKAEA modelling codes CANSWEL-2 for clad ballooning (2D r-theta) treatment taking account of
pellet/clad eccentricity and associated azimuthal temperature gradients) and MABEL-2 (with
CANSWEL-2 as the deformation module) for calculating ballooning and blockage in bundle
geometries and for reactor safety assessment, including mutual feedback with thermal hydraulic
effects and channel blockage.
Following this major effort, research continued including small-scale material tests
particularly concerning the properties of advanced cladding materials, such as binary alloys of the Zr-
Nb type, so that the LOCA response of cores containing these materials could be assessed. ... mehr

Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Angewandte Werkstoffphysik (IAM-AWP)
Publikationstyp Vortrag
Jahr 2017
Sprache Englisch
Identifikator KITopen-ID: 1000076455
HGF-Programm 32.02.11 (POF III, LK 01)
Veranstaltung 23rd International QUENCH Workshop, Karlsruhe Institute of Technology, Karlsruhe, Germany, 17.-19.10.2017
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