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ENSI Erfahrungs- und Forschungsbericht 2011

terministic safety analysis alone could not resolve

the issues of ex-vessel coolability and steam ex-

plosion, since it does not systematically consider

the influence of severe accident scenarios. To ac-

count for all possible accident scenarios, probabi-

listic safety analysis has to be brought into the pic-

ture together with the ongoing emphasis on de-

terministic principles (the key physics of phenom-

ena). Thus, development of an efficient approach

to combine deterministic/probabilistic safety anal-

ysis is the key to resolve the severe accident issues.

The Risk Oriented Accident Analysis Methodology

(ROAAM) is the best framework we can get for this

purpose, including the treatments of aleatory (ac-

cident scenario) and epistemic (physical phenom-

enon) uncertainties. Accordingly, the next phase

(2012–2016) of the MSWI project will be focused

to development of «Risk-oriented framework for

safety analysis of severe accident issues in Nordic

BWRs». The research activities in the new phase

are divided into four sub-tasks, tightly intercon-

nected with each other: (1) risk evaluation and

synthesis (RES); (2) melt ejection mode (MEM); (3)

debris coolability map (DECO); and (4) steam ex-

plosion impact map (SEIM). Guidelines for experi-

mental and analytical activities in the MEM, DECO

and SEIM sub-tasks as well as integration of de-

veloped methods and produced data in ROAAM

frameworks will be provided in RES (risk evalua-

tion and synthesis).

Publications

[1] W. Villanueva, C.T. Tran and P. Kudinov, As-

sessment with coupled thermo-mechanical

creep analysis of combined CRGT and exter-

nal vessel cooling efficiency for a BWR, Proc.

NURETH-14, Toronto, Canada, Sept. 25–29,

2011.

[2] W. Villanueva, C.T. Tran and P. Kudinov, A

Computational study on instrumentation

guide tube failure during a severe accident in

boiling water reactors, Proc. of NURETH-14,

Toronto, Ontario, Canada, September 25–29,

2011.

[3] C.T. Tran and P. Kudinov, Local heat trans-

fer from the corium melt pool to the boil-

ing water reactor pressure vessel wall, Proc.

of NURETH-14, Toronto, Canada, September

25–29, 2011.

[4] P. Kudinov and M. Davydov, Prediction of mass

fraction of agglomerated debris in a LWR se-

vere accident, Proc. of NURETH-14, Toronto,

Ontario, Canada, September 25–29, 2011.

[5] S. Yakush and P. Kudinov, Effects of water

pool subcooling on the debris bed spreading

by coolant flow, Proc. of 2011 Internation-

al Congress on Advances in Nuclear Power

Plants (ICAPP 2011), Nice, France, May 2–5,

2011.

[6] L.X. Li and W.M. Ma, Experimental charac-

terization of effective particle diameter of a

packed bed with multi-diameter spheres, Nu-

clear Engineering and Design, vol. 241, pp.

1736–1745, 2011.

[7] L.X. Li and W.M. Ma, An experimental study

on the effective particle diameter of a packed

bed with non-spherical particles, Transport in

Porous Media, vol. 89, pp. 35–48, 2011.

[8] L.X. Li and W.M. Ma, Experimental investiga-

tions on friction laws and dryout heat flux of

particulate bed packed with multi-size spheres

or irregular particles, Proc. of ICONE19, Chi-

ba, Japan, May 16–19, 2011.

[9] L.X. Li, S. Thakre and W.M. Ma, An experi-

mental study on two-phase flow and coola-

bility of particulate beds packed with multi-

size particles, Proc. of NURETH-14, Toronto,

Canada, September 25–29, 2011.

[10] L.X. Li, A. Karbojian, P. Kudinov and W.M. Ma,

An experimental study on dryout heat flux of

particulate beds packed with irregular parti-

cles, Proc. of ICAPP2011, Nice, France, May

2–5, 2011.

[11] W.M. Ma, Prediction of dryout heat flux of

volumetrically heated particulate beds packed

with multi-size particles, Proc. NURETH-14,

Toronto, Canada, September 25–29, 2011.

[12] S. Yakush, P. Kudinov and N.T. Lubchenko,

Sensitivity and uncertainty analysis of debris

bed coolability, Proc. of NURETH-14, Toronto,

Ontario, Canada, September 25–29, 2011.

[13] R.C. Hansson, L.T. Manickam and T.N. Dinh,

The effect of binary oxide materials on a sin-

gle droplet vapor explosion triggering, Proc.

NURETH-14, Toronto, Canada, September

25–29, 2011.

[14] S. Thakre, L.X. Li and W.M. Ma, A numerical

analysis on the hydrodynamics of heavy mol-

ten droplets in a water pool, Proceedings of

ICAPP 2011, Nice, France, May 2–5, 2011.

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Caple AUF900 Manual de usuario Pagina 255

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