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[en] For the reprocessing of irradiated Magnox nuclear fuel the Purex solvent extraction process using tri-butyl-phosphate (TBP) diluted with odourless kerosene (OK) has been used together with BNFL's own design of gravity flow mixer settler as the solvent extraction contactor. The new thermal oxide reprocessing plant (THORP), which is currently under construction at Sellafield, will reprocess oxide fuel from advanced gas-cooled and light water reactors and will use a similar Purex solvent extraction process. However, THORP fuel will have a plutonium content up to five times greater than Magnox, and depending on the out-of-reactor time, a higher specific activity. This led to a re-appraisal of the type of solvent extraction contactor most suited for this duty. For reasons which are stated, pulsed columns were selected as the solvent extraction contactors for the first, highly active cycle and the plutonium purification cycle of THORP. This paper describes some aspects of the development work carried out at Sellafield on the pulsed columns for the highly active (HA) cycle and illustrates how this work has influenced the design of this part of THORP. (author)
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[en] GG Art.72, 74 Nr.11 a, Nr.75 Nr.4; AtG Paragraph 7; ROG Paragraphs 2, 3 Abs.1 and 3, 5 Abs.4; BV Art.72; BayLplG Art.2, 3, 13, 14. According to Bavarian constitutional law, the right of the people to initiate legislation by means of a petition for a referendum or a plebiscite is of equal rank as the legislative competence of the Land parliament (Art.72 BV). Any petition for a referendum or plebiscite must refer to laws, initiatives for a referendum on decisions taken by the executive power are not allowed by the constitution. Offical head notes of the decision of the Bavarian Constitutional Court, BayVerfGH, 14.8.1987 - Vf. 55 - IX - 87. The full text of the decision is given. (orig./HP)
[de]
GG Art.72, 74 Nr.11 a, 75 Nr.4; AtG Paragraph 7; ROG Paragraphen 2, 3 Abs.1 und 3, 5 Abs.4; BV Art.72; BayLplG Art.2, 4, 13, 14. Nach bayerischem Verfassungsrecht steht das Gesetzgebungsrecht des Volkes durch Volksbegehren und Volksentscheid gleichberechtigt neben der Gesetzgebungsbefugnis des Landtages (Art.72 BV). Volksbegehren und Volksentscheid muessen sich auf Gesetze beziehen. Volksabstimmungen ueber Entscheidungen der Exekutive sieht die Verfassung nicht vor. (BayVerfGH, Entscheidung vom 14.8.1987 - Vf. 55 - IX - 87). Die Entscheidung ist im Wortlaut wiedergegeben. (orig./HP)Journal
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