Search - Number 24 - ASSESSMENT OF AN ACCIDENTAL FUEL RADIONUCLIDE’S RELEASE DATA FROM THE DAMAGED CHERNOBYL NPP UNIT 4

ASSESSMENT OF AN ACCIDENTAL FUEL RADIONUCLIDE’S RELEASE DATA FROM THE DAMAGED CHERNOBYL NPP UNIT 4
Cover not present ASSESSMENT OF AN ACCIDENTAL FUEL RADIONUCLIDE’S RELEASE DATA  FROM THE DAMAGED CHERNOBYL NPP UNIT 4
Category: Number 24
Publication: 24
Summary

A procedure and results of assessment of fuel temperature dynamics during the formation of lava-like fuel containing materials (LFCM) in room 305/2 are presented. The assessment of the overheated fuel temperature carried out using mathematical type codes CORSОR’s type from the known radionuclide’s release data in the period from 26.04 to 11.05.86. It is shown that the main LFCM’s accumulations could be formed at a moderate value of temperatures than previously estimated. The obtained data were used to verify the “blast furnace” version of LFCM formation and formation of FCM with high uranium concentration and temperature of the core fragment’s charge.

Keywords: uranium, fuel-containing materials, 137Cs leaks from fuel, the release rate of volatile fission products, temperature dynamics, charge.

REFERENCES

1. Pazukhin E.М. Lava-like fuel containing mass of the 4 Unit of the Chernobyl NPP: topography, physical and chemical properties, scenario of formation // Radiokhimija. – 1994. – Vol. 36, № 2. – P. 97 – 142. (Rus)

2. Bogatov S. A. Interaction of Chernobyl NPP power Unit 4’s emergency fuel with structural materials - quantitative estimates // Ob"ekt «Ukrytie» - 10 let. Osnovnye rezul'taty nauchnykh issledovanij. - Chernobyl', 1996. - P. 112 - 127. (Rus)

3. Zhydkov O.V. 25 years-evolution of "Shelter" object fuel-containing materials comprehension: formation scenarios and physical considerations // Problemy bezpeky atomnykh elektrostantsiy i Chornobylya. – 2011. - Iss. 16. – P. 86 - 100. (Ukr)

4. Vysotskij E.D., Mihajlov A.V. Conceptual model of the “blast furnace” version of formation of nuclear-dangerous accumulation of the Chernobyl NPP unit 4 // Ibid. – 2013. - Iss. 21. – P. 99 - 106. (Rus)

5. Krasnorutskij V.S., Jakovlev V.K., Danilov A.P. et al. Microstructural analysis of lava-like fuel-containing masses // VAHT. Ser. FRP i RM. - 2010. - № 1. - P. 60 - 67. (Rus)

6. Radioactive aerosols of the object "Shelter": 1986 – 2006 // B. I. Ogorodnikov, E. M. Pazukhin, A. A. Kliuch­nykov. - Chornobyl': Institut problem bezopasnosti AES Natsionalnoy akademii nauk Ukrainy, 2008. - 456 p. (Rus)

7. Borovoj A.A., Velikhov E.P. Chernobyl experience (work on the project "Shelter"). Part 1. Moskva: HITs «Kurchatovskij institut», 2012. - 168 p. (Rus)

8. Sivintsev Ju.V., Khrulev A.A. Evaluation of radioactive release under Chernobyl NPP Unit 4 accident in 1986 year // Atomnaja energija. - 1995. - T. 78, Iss. 6. - P. 403 - 417. (Rus)

9. Technical Bases for Estimating Fission Product Behavior During LWR Accidents, NUREG-0772. U.S. Nuclear Regulatory Commission, Washington, June 1981.

10. Reassessment of Technical Bases for Estimating Source Terms. Final Report. NUREG-0956. U.S. Nuclear Regulatory Commission, Washington, July 1986.

11. Report to the American Physical Society of the study group on radionuclide release from severe accidents at nuclear power plants // Reviews of Modern Physics, Vol. 57, No.3, Part II, July 1985. P. S62 – S65.

12. Study of radionuclide release from Chernobyl NPP Unit 4’s reactor accident / A. A. Rimskij-Korsakov, P. I. Fedotov, Ju. V. Dubasov et al. // Trudy Radievogo instituta imeni V. G. Khlopina. – 2009. - T. XIX. - P. 10 - 22. (Rus)

13. United Nations. Sources and Effects of Ionizing Radiation. United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR) 2000. Report to General Assembly. Annex J.: Exposure and effects of the Chernobyl accident - New York: UN. - 2000. – P. 456 – 566.

14. Scenario for verification of mathematical models using data of measurements of radioactive contamination in Korosten and Korosten district after accident at the Chernobyl NPP / E. K. Garger, T. D. Lev, N. N. Talerko et al. // Problemy bezpeky atomnykh elektrostantsіy і Chornobylya. - 2011. - Iss. 17. - P. 112 - 123. (Rus)

15. Bogatov S.A., Borovoj A.A., Gavrilov S.L. et al. Database on location of Chernobyl NPP Unit 4’s nuclear fuel before and after the accident. – Moskva, 2007. – 146 p. – (Prepr. / RHTs «Kurchatovskij institut»; 130-11/2 ot 01.02.2007 g.). (Rus)

16. The study of lava-like fuel containing materials’ samples taken from different lava depth / E. M. Pazukhin, A. A. Borovoj, A. S. Lagunenko, F. H. Kolomiets // Problemy Chornobylja. - 2002. - Iss. 9. - P. 66 - 75. (Rus)

17. Radioactive wastes of the nuclear power plants and their treatment methods / A. A., Kliuchnykov, E. M. Pazukhin, Ju. M. Shigera, V. Ju. Shigera - Kyiv: Institut problem bezopasnosti AES Natsionalnoy akademii nauk Ukrainy, 2005. - 487 p. (Rus)