Summary and Interpretation of the CABRI REP-Na Program

Papin, J.; Cazalis, B.; Frizonnet, J. M.; Desquines, Jean; Lemoine, Francette; Georgenthum, Vincent; Lamare, F.; Petit, Marc

doi:10.13182/nt07-a3815

Cited by 71 publications

(48 citation statements)

References 4 publications

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“…Several microphone (or acoustic) signals were however recorded before the gas ejection in the coolant. At an enthalpy level of 44 cal/g, a microphone event located near the Peak Power Node (PPN) has been correlated to a limited axial crack extension inside a hydride blister (depth ∼50% of the clad wall thickness), suggesting a possible failure initiation without loss of tightness [3,4].…”

Section: Simulation Of the Cabri Rep-na8 Testmentioning

confidence: 99%

“…The behavior of high burnup fuel during a Reactivity Initiated Accident (RIA) has been studied experimentally in the NSRR [1,2] and CABRI reactors [3,4]. It is now well established that the accumulation of hydrides beneath the thick outer zirconia layer that can form in Zircaloy-4 claddings during base irradiation is a key factor with respect to fuel rod failure during the Pellet Cladding Mechanical Interaction (PCMI) phase of a RIA [5].…”

Section: Introductionmentioning

confidence: 99%

“…In the extreme case of a through-wall hydride blister, the failure can be brittle with no residual strains [6]. During simulated RIA transients on Zircaloy claddings, it has been reported that the rod failure proceeds in a mixed mode with a brittle fracture of the heavily hydrided periphery of the cladding and a ductile propagation in the remaining clad ligament [1][2][3][4]. Ductility is here associated to the change of direction of the throughwall crack, radially orientated in the hydride rim or blister and then bifurcating at ∼45°until the clad inner wall.…”

Section: Introductionmentioning

confidence: 99%

“…The relationship between the blister depth and the maximum fuel enthalpy is seeked by multiple simulations of the CABRI REP-Na8 test [3,4]. 2 The 2D model of the fuel code ALCYONE ALCYONE is a multi-dimensional fuel code co-developed by the CEA, EDF and AREVA within the PLEIADES environment which consists of three different schemes [7]: a 1.5D scheme to model the complete fuel rod, a 3D scheme to model the behaviour of a pellet fragment with the overlying cladding, a 2D(r,u) scheme to model the mid-pellet plane of a pellet fragment, see Figure 1.…”

Section: Introductionmentioning

confidence: 99%

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2D simulation of hydride blister cracking during a RIA transient with the fuel code ALCYONE

Sercombe

Helfer

Federici

et al. 2016

EPJ Nuclear Sci. Technol.

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Abstract. This paper presents 2D generalized plain strain simulations of the thermo-mechanical response of a pellet fragment and overlying cladding during a RIA transient. A fictitious hydride blister of increasing depth (25 to 90% of the clad thickness) is introduced at the beginning of the calculation. When a pre-determined hoop stress is exceeded at the clad outer surface, radial cracking of the blister is taken into account in the simulation by a modification of the mechanical boundary conditions. The hoop stress criterion is based on Finite Element simulations of laboratory hoop tensile tests performed on highly irradiated samples with a through-wall hydride blister. The response of the remaining clad ligament (beneath the cracked blister) to the pellet thermal expansion is then studied. The simulations show that plastic strains localize in a band orientated at ∼45°to the radial direction, starting from the blister crack tip and ending at the clad inner wall. This result is in good agreement with the ductile shear failures of the clad ligaments observed post-RIA transients. Based on a local plastic strain failure criterion in the shear band, ALCYONE simulations are then used to define the enthalpy at failure in function of the blister depth.

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Section: Simulation Of the Cabri Rep-na8 Testmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

2D simulation of hydride blister cracking during a RIA transient with the fuel code ALCYONE

Sercombe

Helfer

Federici

et al. 2016

EPJ Nuclear Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…Homogenization methods were used to determine the current volume behavior of the material. These improvements were undertaken to develop an anisotropic elastoplastic behavior model for hydride Zircaloy that may be used at macro-scale in current RIA fuel codes such as SCANAIR developed by IRSN in the framework of a collaboration with EDF, and globally assessed on CABRI REP-Na (Papin et al, 2007) and NSRR (Suzuki et al, 2006) inpile or integral experiments. SCANAIR is a thermo-mechanical code simulating a fuel rod surrounded by coolant that undergoes an RIA (Figure 2).…”

Section: Fuel Behavior In Dbamentioning

confidence: 99%