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2012 | OriginalPaper | Buchkapitel

16. Severe Accidents and Containment Considerations

verfasst von : John Sackett

Erschienen in: Fast Spectrum Reactors

Verlag: Springer US

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Abstract

The previous chapter considered transient sequences that were terminated without damage by self protecting features of the reactor system design. In this chapter, we provide a mostly qualitative approach to the sequential steps typically followed to evaluate hypothetical core-disruptive-accidents (HCDAs) with significant core damage. In addition, design consideration for containment and accommodation of large sodium fires are presented.

As noted in earlier chapters, because the fuel in fast reactors is not arranged in its most reactive configuration, early studies focused on the very conservative postulate that coherent fuel collapse during a major accident might lead to severe core disruption [1]. Recognition that this arbitrary assumption of coherent core collapse gave results that were much too conservative led to the development of a mechanistic approach to the analysis of core disruptive accidents [2].

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Vorheriges Kapitel Unprotected Transients

Nächstes Kapitel Gas-Cooled Fast Reactors

Leak Before Break (LBB) defines a concept in which a leak will be detected and corrective actions taken prior to a large scale fracture or break occurs.

This term is for the reintroduction of noble gases (e.g., Xe, Kr); thus, it is not considered if the isotope is not a noble gas.

Fallout is not applied to noble gases. Sodium is normally sufficiently abundant that there are no free halogens; consequently, the sodium halides (e.g., NaI, NaBr) are usually treated as particulates with respect to fallout and filtration.

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Titel: Severe Accidents and Containment Considerations
verfasst von: John Sackett
Verlag: Springer US
Buch: Fast Spectrum Reactors
Print ISBN: 978-1-4419-9571-1

Electronic ISBN: 978-1-4419-9572-8

Copyright-Jahr: 2012
DOI: https://doi.org/10.1007/978-1-4419-9572-8_16