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Transients to be Analysed for the LBE–cooled XT-ADS and Lb–cooled EFIT designs M. Schikorr (FzK) EUROTRANS-DM1-Safety Meeting Bruxells, 17 March 2006. Topics of this discussion: Types of Typical Plant Transient Initiators to be analyzed for the LBE / Lb – cooled ADS designs

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Transients to be Analysed for the

LBE–cooled XT-ADS and

Lb–cooled EFIT designs

M. Schikorr (FzK)

EUROTRANS-DM1-Safety Meeting

Bruxells, 17 March 2006

EUROTRANS DM1 Safety Bruxells, 17 March 2006


Topics of this discussion:

  • 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

EUROTRANS DM1 Safety Bruxells, 17 March 2006


1. 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.

EUROTRANS DM1 Safety Bruxells, 17 March 2006


2. 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.

  • 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 it‘s :

    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 !!!!)

EUROTRANS DM1 Safety Bruxells, 17 March 2006


3a. List of Transients that were analyzed for the LBE-cooled

80 MW PDS-XADS (Ansaldo-Design)

EUROTRANS DM1 Safety Bruxells, 17 March 2006


3b. List of Transients that were analyzed for the LBE-cooled

50 MW Myhrra (SCK-CEN Design)

Source : D66 PDS-XADS

EUROTRANS DM1 Safety Bruxells, 17 March 2006


3c. List of Transients that were analyzed for the LBE-cooled

Lb-cooled BREST Reactor Design

Initiating events of ultimate accidents without scram (WS):

EUROTRANS DM1 Safety Bruxells, 17 March 2006


3d. Preliminary List of Transients to be analyzed for the LBE-cooled

LBE- cooled XT-ADS Design.

Preliminary List is currently defined as :

EUROTRANS DM1 Safety Bruxells, 17 March 2006


3e. Preliminary List of Transients to be analyzed for the LBE-cooled

Lb-cooled EFIT Design.

Preliminary List is currently defined as !

EUROTRANS DM1 Safety Bruxells, 17 March 2006


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