Search - Number 20 - FUEL CONTAINING DUST GENERATION BY OBJECT “UKRYTTYA” LAVA MATERIALS

FUEL CONTAINING DUST GENERATION BY OBJECT “UKRYTTYA” LAVA MATERIALS
Cover not present FUEL CONTAINING DUST GENERATION BY OBJECT “UKRYTTYA” LAVA MATERIALS
Category: Number 20
Publication: 20
Summary

Radioactivity of dust with alpha active radio nuclides (AAR), accumulated on the object "Ukryttya" premise 304/3 LFCM surface with area of about 1020 cm2, was measured during 09.2011 - 10.2012 years and time intervals from 1 to 288 days. A purifying of allocated surface was carried out between measurement intervals. Dust with AAR from contaminated air was sampled to two layer filters. Sampled dust amount increased with growth of dust accumulation time. Maximum growth rate was observed during period of LFCM drying out from condensate. Average dust radionuclide alpha activity rate generation was about 1,1?10-3 Bk/сm2?day or 3,9 kBk/m2?year (670 day accumulation data). It is necessary 2 mcm layer of selected LFCM surface transformation to dust to form year amount of AAR. Detected, that number of big dust particles exceeded number needed for lognormal distribution. Number of big dust particles decreased for about 1,7 times and number of small dust particles (less 0,8 mcm) increased for more than 2,4 times during 182 days. In bimodal lognormal distribution approximation median aerodynamic diameters (AD) for smaller particles were found. In studied time interval of dust accumulation value of median AD bigger fraction decreased and value of median AD smaller fraction was approximately constant.

Keywords: Radioactive dust generation; fuel aerosol; LFCM surface; LFCM destruction.

REFERENCES
1. Bogatov S.А., Borovoy А.А., Kiselev А.N. at. al. Speed estimation of fuel-containing masses erosion into “Sarko-fag” and characteristics of created particles– Moskva, 1991. – 21 p. – (Prepr. / INE nam. I. V. Kurchatov; № 5434/3). (Rus)
2. Bogatov S.А., Borovoy А.А.,Evstratenko А.S. Heruvimov А.N. Object “Ukryttya” fuel masses behavior dynamics. - Chornobyl, 1992. - 19 p. – (Prepr. / NAS Ukraine. ISTC «Ukryttya»; № 92-29). (Rus)
3. Baryakhtar V.G., Gonchar V.V., Zhidkov O.V., Klyuchnycov O. O. About dust generating ability of object “Ukryttya” accident irradiated fuel and lava fuel-containing materials - Chornobyl, 1997. - 20 p. – (Prepr. / NAS Ukraine. ISTC «Ukryttya»; № 97-10). (Rus)
4. Zhidkov O.V. Fuel-containing materials of “Shelter” object today: rutial physicfl properties and facilities for their state prognosis creation // Problemy Chornobylya. - 2001. - Iss. 7. - P. 23 - 40. (Rus)
5. Badovsky V. P., Klyuchnycov O. O., Melenevsky O. E. at al. Radioactive aerosols of object “Ukryttya” 304/3 room and dust generating ability in it // Problemy bezpeky atomnyh electrostantsiy i Chornobylya (Problems of Nuclear Power Plants' Safety and of Chornobyl). – 2011. – Iss. 16. – P. 67 – 76. (Rus)
6. Melenevsky O. E., Badovsky V. P., Klyuchnycov O. O. at al. LFCM surface state assessment in real conditions of object “Ukryttya” // Sb. docl. «Twenty-five Years after Chernobyl Accident. Safety for the Future». 20 - 22 April 2011 г. – Кyiv, 2011. - . C. 2. - P. 46 – 50. (Rus)
7. Radioactive contamination. Deactivation. Bibliotechka «Voennye znaniya» / Editor А. D. Zimon. – 2-nd ed., recast and add. – М.: Stroyizdat, 2001. – 56 p. (Rus)
8. Badovsky V. P., Klyuchnycov O. O., Kravchuk Т.А. at al. Aerozol situation monitoring in some under-reactor premises at object “Ukryttya” // Problemy bezpeky atomnyh electrostantsiy i Chornobylya (Problems of Nuclear Power Plants' Safety and of Chornobyl). – 2008. – Iss. 10. – P. 99 – 110. (Rus)
9. Arutunian R.V., Bolshov L.А., Borovoy А.А. at al. Nuclear fuel in Chornobyl NPP object “Shelter”. – М.: Nauka, 2010. – 240 p. (Rus)
10. Goliney І.Yu., Sugakov V.I. Some mechanisms of fuel-containing materials degradation // Problems of nuclear power plants’ safety and of Chornobyl. – 2007. – Iss. 8. – P. 86 – 91. (Ukr)
11. Zamyshlaev B. V., Evterev L.S. Models of dynamic deformation and destruction. – М.: Nauka, 1990. – 215 p. (Rus)
12. Cherepanov G. P. Mechanics of fragile destruction. - М.: Nauka, 1974. – 640 p. (Rus)
13. Raist P. Aerosols. Introduction in theory. – М.: Mir, 1987. (Rus)
14. Kashparov V.А., Ivanov Yu.А., Zvarich S.I. at al. Modeling of hot particles creation during Chornobyl NPP acci-dent // Radiochimia. - 1994. - Vol. 36, Iss. 1. - P. 87 - 93. (Rus)
15. Ogorodnikov B. I., Khan V. Е., Kovalchuk V.P. Aerosols - witnesses of object “Ukryttya” lava fuel-containing materials destruction // Problemy bezpeky atomnyh electrostantsiy i Chornobylya (Problems of Nuclear Power Plants' Safety and of Chornobyl). - 2013. - Iss. 20. - С. 94 - 106. (Rus)

Full text