Search - Number 20 - ANALYSING UNCERTAINTY OF CAUSES OF SEVERE ACCIDENTS AT FUKUSHIMA-DAIICHI

ANALYSING UNCERTAINTY OF CAUSES OF SEVERE ACCIDENTS AT FUKUSHIMA-DAIICHI
Cover not present ANALYSING UNCERTAINTY OF CAUSES OF SEVERE ACCIDENTS AT FUKUSHIMA-DAIICHI
Category: Number 20
Publication: 20
Summary

The paper analyses uncertainty of causes of severe accidents at Fukushima-Daiichi relating to a state of a reactor core and vessels, the nature and mechanisms of steam-gas explosions, efficiency of stuff's actions to decrease pressure in containment and to cool the damaged fuel. It is shown that the main uncertainties are: the state of uncertainty in the core and the reactor pressure during the development of accidents at power units № 1 - 3 determines the possibility of different scenarios, the uncertainty of the nature and mechanisms arising steam explosions uncertainty effectiveness of personnel to reduce the pressure in the containment vessel and the cooling of the molten / damaged fuel.

Keywords: severe accident, containment, hydrogenous steam-air mixture, fuel-containing masses, initial event of accident.

REFERENCES
1. Braun M. The Fukushima Daiichi Incident. - AREVA NP, 2011. - 33 p.
2. Impact to TEPCO's Facilities due to Miyagiken-Oki Earthquake (as of 3:00 PM). - TEPCO Press Release, March 13, 2011.
3. The Accident at TEPCO's Fukushima Nuclear Power Stations. - Report of Japanese Government to the IAEA Ministerial Conference on Nuclear Safety. - Chapter 4. - 2011.
4. Moriyama K. et al. Evaluation of Containment Failure Probability by Ex-Vessel Steam Explosion in Japanese LWR Plants // Journal of Nuclear Science and Technology. - 2006. - 43 (7). - P. 774 - 784.
5. Evaluating the Risk of Steam Explosions. - Nuclear Safety Research. - JAEA R & D Review. - 2006. - 83 p.
6. Goddard I. Fukushima Unit 3: Steam-Explosion Theory. - Www.LewRockwell.com. - 2011.
7. Unit3 D/W pressure rate of change (MPa/h) in the period 0-96 hours after quake. TEPCO raw data for Unit 3. 2011.
8. Rusov V., Linnik E., Vaschenko etc. Traveling Wave reactor and Condition of Existence of Nuclear Burning Soliton-Like Wave in Neutron-Multiplying Media / / Energies. - 2011. - No. 4. - P. 1337 - 1361.
9. Pogosov A. Physical and technical analysis of the latent factors of disturbance in the power plant Fukushima-1 // Yadernaya i radiatsionnaya besopasnost'. - 2012. - № 1. (Rus)
10. Pogosov A., Gerliga V. A., Domashev Ye. D. Current Methods of Empirical Analysis of the Thermohidraulic Stability of Steam-Generating Channels and the Development with Consideration of the Feasibility of Employing the Noise of Operating Parameters (A Review) // Heat Transfer Research. - 1997. - Vol. 26, No. 3-8. - Reprint: Begell House, Inc. ISSN 1064-2269. - P. 502 - 510.
11. Kazachkov I. Current status and some problems of modeling of severe accidents at nuclear power plants abroad / / Yadernaya i radiatsionnaya besopasnost'. - 2003. - № 1. - S. 25 - 34. (Rus)

Full text