CADOR “Core with Adding DOppleR effect” concept application to sodium fast reactors

Alain Zaetta (), Bruno Fontaine (), Pierre Sciora (), Romain Lavastre, Robert Jacqmin, Vincent Pascal (), Michel Pelletier, Gérard Mignot and Aurélien Jankowiak
Additional contact information
Alain Zaetta: CEA Cadarache - CEA - Commissariat à l'énergie atomique et aux énergies alternatives
Bruno Fontaine: CEA Cadarache - CEA - Commissariat à l'énergie atomique et aux énergies alternatives
Pierre Sciora: CEA Cadarache - CEA - Commissariat à l'énergie atomique et aux énergies alternatives
Romain Lavastre: CEA Cadarache - CEA - Commissariat à l'énergie atomique et aux énergies alternatives
Robert Jacqmin: CEA Cadarache - CEA - Commissariat à l'énergie atomique et aux énergies alternatives
Vincent Pascal: CEA Cadarache - CEA - Commissariat à l'énergie atomique et aux énergies alternatives
Michel Pelletier: CEA Cadarache - CEA - Commissariat à l'énergie atomique et aux énergies alternatives
Gérard Mignot: CEA Cadarache - CEA - Commissariat à l'énergie atomique et aux énergies alternatives
Aurélien Jankowiak: CEA-DES (ex-DEN) - CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) - CEA - Commissariat à l'énergie atomique et aux énergies alternatives

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Abstract: Generation-IV sodium fast reactors (SFR) will only become acceptable and accepted if they can safely prevent or accommodate reactivity insertion accidents that could lead to the release of large quantities of mechanical energy, in excess of the reactor containment's capacity. The CADOR approach based on reinforced Doppler reactivity feedback is shown to be an attractive means of effectively preventing such reactivity insertion accidents. The accrued Doppler feedback is achieved by combining two effects: (i) introducing a neutron moderator material in the core so as to soften the neutron spectrum; and (ii) lowering the fuel temperature in nominal conditions so as to increase the margin to fuel melting. This study shows that, by applying this CADOR approach to a Generation-IV oxide-fuelled SFR, the resulting core can be made inherently resistant to reactivity insertion accidents, while also having increased resistance to loss-of-coolant accidents. These preliminary results have to be confirmed and completed to meet multiple safety objectives. In particular, some margin gains have to be found to guarantee against the risk of sodium boiling during unprotected loss of supply power accidents. The main drawback of the CADOR concept is a drastically reduced core power density compared to conventional designs. This has a large impact on core size and other parameters.

Date: 2019-01
New Economics Papers: this item is included in nep-ene
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Published in EPJ N - Nuclear Sciences & Technologies, 2019, 5, pp.1. ⟨10.1051/epjn/2018049⟩

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Persistent link: https://EconPapers.repec.org/RePEc:hal:journl:cea-02071114

DOI: 10.1051/epjn/2018049

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