SYMPOSIA PAPER Published: 01 June 2023
STP164720220049

Radiation Embrittlement Surveillance and Trend Evaluation in Hungary

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The scatter of the existing trend curves is too large for the WWER-440 reactors operated in Hungary because the end-of-life fluence of these units are out of the validity range of the existing trend curves with the exception of the Russian trend curves. The RPV wall material of the WWER-440 reactors is the 15Kh2MFA low-copper, low-nickel, and vanadium-killed steel. The microstructure and irradiation damage mechanisms of 15Kh2MFA deviate from the other RPV materials. The surveillance specimens in the WWER-440 units are located near the core, the lead factor is between 12 and 18, and the irradiation embrittlement after 4 to 5 years of exposure corresponds to about 50 to 80 years of irradiation of the RPV wall and welds. The surveillance sets contain Charpy specimens, tensile specimens, and three-point bend specimens for fracture toughness evaluation. The surveillance database in the European countries is increased by the results of extended surveillance programs and testing reconstituted specimens. For each unit sufficient high-fluence data were available at the first years of operation to directly evaluate the Charpy and Master Curve shift, and therefore the use of embrittlement trend curves is unnecessary.

Author Information

Gillemot, Ferenc
Centre for Energy Research, Laboratory of Fuel and Reactor Materials, Budapest, HU
Cinger, Dávid
Centre for Energy Research, Laboratory of Fuel and Reactor Materials, Budapest, HU
Szenthe, Ildikó
Centre for Energy Research, Laboratory of Fuel and Reactor Materials, Budapest, HU
Horváth, Márta
Centre for Energy Research, Laboratory of Fuel and Reactor Materials, Budapest, HU
Móritz, Szilvia
Centre for Energy Research, Laboratory of Fuel and Reactor Materials, Budapest, HU
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Pages: 321–335
DOI: 10.1520/STP164720220049
ISBN-EB: 978-0-8031-7742-0
ISBN-13: 978-0-8031-7741-3