Experimental Studies on Heat Transfer in External Cooling of the Reactor Pressure Vessel
NURETH-14 - 2011 September 25-30

Presented at:
2011 September 25-30
Toronto, Canada
Session Title:
O7-1 Pressurized Thermal Shock: General Studies

Timo Merisaari (TVO)
Heikki Purhonen (Lappeenranta University of Technology)
Antti Räsänen (Lappeenranta University of Technology)
Riitta Kyrki-Rajamäki (Lappeenranta University of Technology)
Karoliina Myllymäki (Fortum Power and Heat)
Timo Toppila (Fortum Power and Heat)


The filling of the reactor cavity by accidental initiation of the containment spray system, while reactor is in full power, could have severe consequences. If the relatively cold water suddenly cools down the wall of fully pressurized reactor pressure vessel and a crack is assumed to be located on the outer surface of the vessel, the induced thermal stresses might damage the pressure vessel wall. The effects of the inadvertent cooling and pressurized thermal shock (PTS) were studied experimentally at Lappeenranta University of Technology and the heat transfer coefficients gained from the experimental results were compared with calculations.

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