CROCUS is a research reactor at École Polytechnique Fédérale de Lausanne in Switzerland, sometimes described as "zero power" but in fact limited to 100 W.

This low power means that within a few hours of shutdown, it is safe for personnel to enter the biological shield, as the residual radioactivity of the core has decayed to safe levels. The biological shield consists of a concrete wall, with a 14-ton door for personnel access. There is also a removable 50-ton concrete trapdoor in the top of the shield, to allow for fuel and equipment changes.

CROCUS uses low-enriched uranium (LEU) metal fuel, immersed in a tank of demineralised light water which acts as moderator and reflector. There is no special provision for cooling required.

CROCUS is controlled by two control rods and by adjusting the water level in the moderator tank. A neutron source is placed under the core to aid startup. In addition, there are two safety control rods and four surge tanks, making six independent safety systems. Any one of these six is capable of producing a complete emergency shutdown (scram) in less than one second, and is triggered automatically should power exceed the authorised level.

CROCUS is used for teaching reactor physics.

External links

*fr [ CROCUS] page at the École Polytechnique Fédérale de Lausanne website.

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  • Crocus — Cro cus (kr[=o] k[u^]s), n. [L., saffron, fr. Gr. kro kos; cf. Heb. kark[=o]m, Ar. kurkum, Skr. ku[.n]kuma.] 1. (Bot.) A genus of iridaceous plants, with pretty blossoms rising separately from the bulb or corm. {Crocus vernus} is one of the… …   The Collaborative International Dictionary of English

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  • crocus — late 14c., from L. crocus, from Gk. krokos saffron, crocus, probably of Semitic origin (Cf. Arabic kurkum), ultimately from Skt. kunkumam, unless the Sanskrit word is from the Semitic one. The autumnal crocus (Crocus sativa) was a common source… …   Etymology dictionary

  • Crocus — es un género de plantas bulbosas perennes. Como son una de las primeras plantas en florecer al llegar la primavera, son muy apreciadas por los jardineros. Las flores son de color morado, blanco, amarillo o de una combinación de éstos. Se conocen… …   Enciclopedia Universal

  • crocus — [krō′kəs] n. pl. crocuses or croci [krō′sī΄] [ME < L < Gr krokos, saffron, via Sem (as in Heb karkōm, Ar kurkum, Aram kūrkāmā, saffron, crocus), ult. < Sans kuṅkumam] 1. any of a large genus (Crocus) of spring blooming plants of the iris …   English World dictionary

  • crocus — the flower, has plural forms crocuses (several flowers) and crocus (used collectively). Croci is limited to technical contexts …   Modern English usage

  • Crocus [1] — Crocus (C. L.), Pflanzengattung aus der Familie der Irideae, 3. Kl. 1. Ordn. L., mit einfacher, blumenartiger, regelmäßig trichterförmiger Blüthenhülle, die eine sehr lange Röhre u. einen sechstheilig glockigen Saum hat; 3 Staubgefäße an der… …   Pierer's Universal-Lexikon

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