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Effectiveness of SFP Spray Cooling during Loss of Coolant Accidents

Davor Grgić, ; Faculty of Electrical Engineering and Computing, University of Zagreb Unska 3, Zagreb, Hrvatska
Josip Đaković, ; Faculty of Electrical Engineering and Computing, University of Zagreb Unska 3, Zagreb, Hrvatska
Siniša Šadek, ; Faculty of Electrical Engineering and Computing, University of Zagreb Unska 3, Zagreb, Hrvatska
Štefica Vlahović ; Faculty of Electrical Engineering and Computing, University of Zagreb Unska 3, Zagreb, Hrvatska
Ivica Bašić ; APoSS d.o.o Repovec 23b, 49210 Zabok, Croatia

Sažetak

For a large Spent Fuel Pool (SFP) loss of coolant accidents, properly sized SFP spray can
slowdown or possibly preclude fast heat-up of spent fuel. The MELCOR 2.1 model of NPP Krsko
pool was developed and tested for cases of loss of cooling accidents. The simple spray system with
spray nozzles distributed at specified location at the top of the pool was added to the model.
Different loss of coolant rates where studied for different fuel heat loadings, and different openings
and flow rates of the spray nozzles. Traditionally, spray nozzles able to produce larger diameter
droplets are used close to the fuel locations with higher heat loadings. According to preliminary
results, spray nozzles that will be installed are able to limit or delay long-term heat-up of the spent
fuel, but in the case of late actuation it is possible to have temporary high oxidation rates and
corresponding production of hydrogen.

Ključne riječi

SFP, large loss of coolant, MELCOR, spray nozzles

Hrčak ID:

247102

URI

https://hrcak.srce.hr/247102

Datum izdavanja:

28.10.2019.

Posjeta: 631 *