The objective of this thesis is the power transient analysis concerning experimental devices placed within the reflector of Jules Horowitz
Reactor (JHR). Since JHR material testing facility is designed to achieve 100 MW core thermal power, a large reflector hosts fissile
material samples that are irradiated up to total relevant power of 3 MW. MADISON devices are expected to attain 130 kW, conversely ADELINE
nominal power is of some 60 kW. In addition, MOLFI test samples are envisaged to reach 360 kW for what concerns LEU configuration and up
to 650 kW according to HEU frame. Safety issues concern shutdown transients and need particular verifications about thermal power
decreasing of these fissile samples with respect to core kinetics, as far as single device reactivity determination is concerned.
Calculation model is conceived and applied in order to properly account for different nuclear heating processes and relative time-dependent
features of device transients. An innovative methodology is carried out since flux shape modification during control rod insertions is
investigated regarding the impact on device power through core-reflector coupling coefficients. In fact, previous methods considering only
nominal core-reflector parameters are then improved. Moreover, delayed emissions effect is evaluated about spatial impact on devices of a
diffuse in-core delayed neutron source. Delayed gammas transport related to fission products concentration is taken into account through
evolution calculations of different fuel compositions in equilibrium cycle. Provided accurate device reactivity control, power transients
are then computed for every sample according to envisaged shutdown procedures. Results obtained in this study are aimed at design feedback
and reactor management optimization by JHR project team. Moreover, Safety Report is intended to utilize present analysis for improved
device characterization.
| Identifer | oai:union.ndltd.org:unibo.it/oai:amsdottorato.cib.unibo.it:5689 |
| Date | 24 May 2013 |
| Creators | Console Camprini, Patrizio <1984> |
| Contributors | Sumini, Marco |
| Publisher | Alma Mater Studiorum - Università di Bologna |
| Source Sets | Università di Bologna |
| Language | English |
| Detected Language | English |
| Type | Doctoral Thesis, PeerReviewed |
| Format | application/pdf |
| Rights | info:eu-repo/semantics/openAccess |
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