CROCUS


CROCUS

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 [http://lrs.epfl.ch/page10669.html CROCUS] page at the École Polytechnique Fédérale de Lausanne website.


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  • Crocus — Saltar a navegación, búsqueda ? Crocus Crocus vernus Cla …   Wikipedia Español

  • crocus — [ krɔkys ] n. m. • 1372; mot lat.; gr. krokos « safran » ♦ Plante herbacée bulbeuse (iridacées) à floraison précoce. Crocus printanier à fleurs blanches, mauves. Espèce de crocus cultivée. ⇒ 1. safran. ● crocus nom masculin (latin crocus, du grec …   Encyclopédie Universelle

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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

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  • 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

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  • 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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