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[en] The recovery work of the cleaning tank that has suffered a serious incident in 10-11th of April, 2003 is under planning in the 2nd unit of the Packs Nuclear Power Plant. During this work, the service shaft will be operated in a low-coolant-level operational mode. Since the operators of the damaged fuel removing equipment will work standing on a platform just above the surface of the coolant of decreased level, protecting them against unnecessary personal doses is a very important task. From this viewpoint, the coolant of the service shaft plays double role. First, the few meters high layer of coolant between the working platform and the damaged fuel is an important part of the biological shielding for the workers. O the other hand, due to the considerable amount od radioactive contamination dispersed into the coolant, it is also a source of radiation. Therefore the vertical distribution of the contamination in the service shaft is a very important question during different operational modes of the cooling and purification systems (Authors)
Source
Vidovszky, I. (ed.); VUJE, Inc., 918 64 Trnava (Slovakia); KFKI Atomic Energy Research Institute, Reactor Analysis Laboratory, H-1525 Budapest 114, POB 49 (Hungary); NPP Dukovany, 675 50 Dukovany (Czech Republic); Institute State Scientific and Technical Center for Nuclear and Radiation Safety, 35-37 Radgospna street, 03142 Kyiv-142 (Ukraine); Kozloduy NPP plc, Kozloduy 3321 (Bulgaria); Jaslovske Bohunice NPP (Slovakia); Nuclear Research Institute Rez plc, CZ-250 68 Husinec-Rez, cp.130 (Czech Republic); ALTA Dukovany, NPP Dukovany, 675 50 Dukovany (Czech Republic); Budapest University of Technology and Economics, Institute of Nuclear Techniques, Budapest XI, Mueegyetem rkp. 9, 1111 (Hungary); International Atomic Energy Agency (IAEA), Wagramerstrasse 5, P.O.Box 100, A-1400 Vienna (Austria); 783 p; ISBN 963-372-632 8; 
; Nov 2005; p. 719-730; 15. Atomic Energy Research Symposium on WWER Reactor Physics and Reactor Safety; Znojmo (Czech Republic); 3-7 Oct 2005; Also available from VUJE, Inc., Okruzna 5, 918 64 Trnava (SK); 1 ref.; 12 figs.; 1 tab.
; Nov 2005; p. 719-730; 15. Atomic Energy Research Symposium on WWER Reactor Physics and Reactor Safety; Znojmo (Czech Republic); 3-7 Oct 2005; Also available from VUJE, Inc., Okruzna 5, 918 64 Trnava (SK); 1 ref.; 12 figs.; 1 tab.