Forschungszentrum Karlsruhe Technik und Umwelt IRS /FzK W.M.Schikorr EUROTRANS DM1 Safety Bruxells, 17 March Transients to be Analysed for the LBE–cooled XT-ADS and LBE–cooled XT-ADS and Lb–cooled EFIT designs M. Schikorr (FzK) EUROTRANS-DM1-Safety Meeting Bruxells, 17 March 2006

Forschungszentrum Karlsruhe Technik und Umwelt IRS /FzK W.M.Schikorr EUROTRANS DM1 Safety Bruxells, 17 March Topics of this discussion: 1.Types of Typical Plant Transient Initiators to be analyzed for the LBE / Lb – cooled ADS designs 2.Summary of Results of the Transient Analyses of the 80 MW LBE – cooled XADS (ANSALDO Design) 3.List of Transients that were analyzed for the PDS-XADS 4.List of Transients to be analysed for XT-ADS and EFIT

Forschungszentrum Karlsruhe Technik und Umwelt IRS /FzK W.M.Schikorr EUROTRANS DM1 Safety Bruxells, 17 March Typical Plant Transient Initiators for : -Protected case (with normal shutdown) and -Unprotected case (shutdown failure). 1.Loss of Flow (LOF): pump failure 2. Loss of Heat Sink (LOH) : heat sink failure 3. Overpower Transient (TOP) : reactivity insertion 4.Loss of Coolant (LOCA) : primary system leak 5. Design specific transients : i.e. HX tube rupture, jet etc.

Forschungszentrum Karlsruhe Technik und Umwelt IRS /FzK W.M.Schikorr EUROTRANS DM1 Safety Bruxells, 17 March Summary of XADS Safety Transient Analyses : 1.For the LBE-cooled 80 MWth XADS, as designed by ANSALDO, no transient could be identified that could lead to severe or catastrophic consequences. 2.For the worst combination of transients (ULOH+ULOF) the grace time until excessive clad temperatures (> 1000 °C) are reached is between 30 and 60 minutes. 3.The dynamic response of the system is in general very benign to all transients considered, mainly due to its : a.large heat sink / heat buffer capacitiy provided by the LBE coolant, and b.excellent natural convection characterisitics of the core/plant design (that is specfic to the Ansaldo XADS design !!!!)

Forschungszentrum Karlsruhe Technik und Umwelt IRS /FzK W.M.Schikorr EUROTRANS DM1 Safety Bruxells, 17 March a.List of Transients that were analyzed for the LBE-cooled 80 MW PDS-XADS (Ansaldo-Design)

Forschungszentrum Karlsruhe Technik und Umwelt IRS /FzK W.M.Schikorr EUROTRANS DM1 Safety Bruxells, 17 March b.List of Transients that were analyzed for the LBE-cooled 50 MW Myhrra (SCK-CEN Design) Source : D66 PDS-XADS

Forschungszentrum Karlsruhe Technik und Umwelt IRS /FzK W.M.Schikorr EUROTRANS DM1 Safety Bruxells, 17 March Initiating events of ultimate accidents without scram (WS): 3c. List of Transients that were analyzed for the Lb-cooled BREST Reactor Design

Forschungszentrum Karlsruhe Technik und Umwelt IRS /FzK W.M.Schikorr EUROTRANS DM1 Safety Bruxells, 17 March d.Preliminary List of Transients to be analyzed for the LBE-cooled XT-ADS Design. Preliminary List is currently defined as :

Forschungszentrum Karlsruhe Technik und Umwelt IRS /FzK W.M.Schikorr EUROTRANS DM1 Safety Bruxells, 17 March e.Preliminary List of Transients to be analyzed for the Lb-cooled EFIT Design. Preliminary List is currently defined as !