Impact of different TRU compositions on system response during an unprotected station blackout in small lead-cooled reactors
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| Title: | Impact of different TRU compositions on system response during an unprotected station blackout in small lead-cooled reactors |
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| Authors: | Dehlin, Fredrik, 1994, Wallenius, Janne, 1968 |
| Source: | Annals of Nuclear Energy. 222 |
| Subject Terms: | TRU, Station Blackout, Small lead-cooled reactor, RVACS, Kärnenergiteknik, Nuclear Engineering |
| Description: | The dynamic response to an Unprotected Station Blackout (USBO) has been evaluated for a small, lead-cooled reactor when fuelled with two different actinide composition: one sourced from spent light water reactor (LWR) fuel and the other from UN fuel discharged from a small LFR. We demonstrate that a reduction in the delayed neutron fraction, primarily due to the addition of americium, leads to lower peak temperatures during phase one of the USBO. This reduction could help with ensuring cladding integrity despite an increased internal gas pressure resulting from helium production during the decay of 242Cm. It is also shown that the coolant volume required to buffer decay heat until vessel air cooling becomes effective must be increased to ensure the integrity of the fuel cladding. We conclude by demonstrating that (U,Pu)N fuel, with negligible 241Pu content, offers the best properties to ensure cladding integrity during the USBO. |
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| Access URL: | https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-363354 https://doi.org/10.1016/j.anucene.2025.111586 |
| Database: | SwePub |
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Nájsť tento článok vo Web of Science | Abstract: | The dynamic response to an Unprotected Station Blackout (USBO) has been evaluated for a small, lead-cooled reactor when fuelled with two different actinide composition: one sourced from spent light water reactor (LWR) fuel and the other from UN fuel discharged from a small LFR. We demonstrate that a reduction in the delayed neutron fraction, primarily due to the addition of americium, leads to lower peak temperatures during phase one of the USBO. This reduction could help with ensuring cladding integrity despite an increased internal gas pressure resulting from helium production during the decay of 242Cm. It is also shown that the coolant volume required to buffer decay heat until vessel air cooling becomes effective must be increased to ensure the integrity of the fuel cladding. We conclude by demonstrating that (U,Pu)N fuel, with negligible 241Pu content, offers the best properties to ensure cladding integrity during the USBO. |
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| ISSN: | 03064549 |
| DOI: | 10.1016/j.anucene.2025.111586 |