The In-Pile Local Blockage Experiments Mol-7C/6 and 7 — Results and Preliminary Interpretation

Schleisiek, K.; Aberle, J.; Jacobi, S.; Rahn, A.; Schmidt, LH; Vanmassenhove, G.; Verwimp, A.

doi:10.13182/nt92-a34713

Cited by 4 publications

(1 citation statement)

References 1 publication

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“…Many in-pile experiments [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41] related to failure propagation after fuel ejection have been performed. The main experimental conditions and results of these in-pile tests are summarized in Table 5 based on a broad review of open papers.…”

Section: Pin-to-pin Failure Propagationmentioning

confidence: 99%

Comprehensive and consistent interpretation of local fault experiments and application to hypothetical local overpower accident in Monju

Fukano

2013

Journal of Nuclear Science and Technology

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Experimental studies on local fault (LF) accidents in fast breeder reactors have been performed in many countries because LFs have been historically considered as one of the possible causes of severe accidents. Comprehensive and consistent interpretations of in-pile and out-of-pile experiments related to LF were arrived at in this study based on state-of-the-art review and data analysis techniques. Safety margins for a hypothetical local overpower accident, which was evaluated as a LF accident in the licensing document of the construction permit for a prototype fast breeder reactor called Monju, were also studied. Based on comprehensive interpretations of the latest experimental database, including those performed after the permission of Monju construction, it was clarified that the evaluation of the hypothetical local overpower accident in the Monju licensing was sufficiently conservative. Furthermore, it incorporated adequate safety margins in terms of failure thresholds of the fuel pin, molten fuel ejection, fuel sweep-out behavior after molten fuel ejection, and pin-to-pin failure propagation. Moreover, these comprehensive interpretations are valid and applicable to the safety evaluation of LF accidents of other fast breeder reactors with various fuel and core designs.

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Section: Pin-to-pin Failure Propagationmentioning

confidence: 99%

Comprehensive and consistent interpretation of local fault experiments and application to hypothetical local overpower accident in Monju

Fukano

2013

Journal of Nuclear Science and Technology

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SAS4A analysis on hypothetical total instantaneous flow blockage in SFRs based on in-pile experiments

Fukano

2015

Annals of Nuclear Energy

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Development and Validation of SAS4A Code and Its Application to Analyses on Severe Flow Blockage Accidents in a Sodium-Cooled Fast Reactor

Fukano

2019

Journal of Nuclear Engineering and Radiation Science

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Local subassembly faults (LFs) have been considered to be of greater importance in safety evaluation in sodium-cooled fast reactors (SFRs) because fuel elements were generally densely arranged in the subassemblies (SAs) in this type of reactors, and because power densities were higher compared with those in light water reactors. A hypothetical total instantaneous flow blockage (HTIB) at the coolant inlet of an SA gives most severe consequences among a variety of LFs. Although an evaluation on the consequences of HTIB using SAS4A code was performed in the past study, SAS4A code was further developed by implementing analytical model of power control system in this study. An evaluation on the consequences of HTIB in an SFR by this developed SAS4A code was also performed in this study. It was clarified by the analyses considering power control system that the reactor would be safely shut down by the reactor protection system triggered by either of 116% over power or delayed neutron detector (DND) trip signals. Therefore, the conclusion in the past study that the consequences of HTIB would be much less severe than that of unprotected-loss-of-flow (ULOF) was strongly supported by this study. Furthermore, SAS4A code was newly validated using four in-pile experiments which simulated HTIB events. The validity of SAS4A application to safety evaluation on the consequence of HTIB was further enhanced in this study. Thus, the methodology of HTIB evaluation was established in this study together with the past study and is applicable to HTIB evaluations in other SFRs.

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The In-Pile Local Blockage Experiments Mol-7C/6 and 7 — Results and Preliminary Interpretation

Cited by 4 publications

References 1 publication

Comprehensive and consistent interpretation of local fault experiments and application to hypothetical local overpower accident in Monju

Comprehensive and consistent interpretation of local fault experiments and application to hypothetical local overpower accident in Monju

SAS4A analysis on hypothetical total instantaneous flow blockage in SFRs based on in-pile experiments

Development and Validation of SAS4A Code and Its Application to Analyses on Severe Flow Blockage Accidents in a Sodium-Cooled Fast Reactor

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