May 22nd & 23rd 2007 Stockholm EUROTRANS: WP 1.5 Task Containment Assessment IP-EUROTRANS DOMAIN 1 Design WP 1.5 Safety Assessment of the Transmutation System Design

May 22nd & 23rd 2007 Stockholm EUROTRANS: WP 1.5 Task Containment Assessment Scope EUROTRANS Detailed Implementation Plan 3rd DIP, WP1.5 objectives: Perform scoping assessment of the source term and the containment and to determine if there are no show-stoppers EUROTRANS Detailed Implementation Plan 3rd DIP, Task 1.5.4: “This task is concerned with the analysis of the integrity of the containment and its leak tightness to keep any fission products released from the vessel from escaping the containment. The adequacy of the containment systems proposed by the designers will be addressed by assessing thermal and pressure loading of the containment due to release of coolant and melt from the vessel. LWR containment codes may be modified for this purpose. Transport of the fission product and polonium compounds in the containment will also be considered”.

May 22nd & 23rd 2007 Stockholm EUROTRANS: WP 1.5 Task Containment Assessment ADS Safety Barriers For fission products: Fuel cladding Primary coolant boundary Containment For spallation products: Target boundary Accelerator isolation/Primary coolant boundary Containment

May 22nd & 23rd 2007 Stockholm EUROTRANS: WP 1.5 Task Containment Assessment The Containment System Safety Functions: fission product confinement and control protection against external events biological shielding

May 22nd & 23rd 2007 Stockholm EUROTRANS: WP 1.5 Task Containment Assessment Fission product confinement and control Limitation of radionuclide releases Fission and spallation product removal mechanisms containment isolation leak tightness Containment integrity structural behaviour energy management system

May 22nd & 23rd 2007 Stockholm EUROTRANS: WP 1.5 Task Containment Assessment Fission and spallation product removal mechanisms Definition of radioactive products liberation to containment in different DBC and DEC Special care with the consideration of severe accident conditions Identification of the need for radioactive products removal means

May 22nd & 23rd 2007 Stockholm EUROTRANS: WP 1.5 Task Containment Assessment Containment isolation: Containment isolation provisions shall be designed to assure that fluid lines which penetrate the Primary Containment boundary are isolated in the event of DBC or DECs, so as to minimise the release of radioactivity to the environment. Also applicable to accelerator tube. Leak tightness: Containment shall be designed leaktight with a maximum leak rate compatible with dose limits considering design pressure.

May 22nd & 23rd 2007 Stockholm EUROTRANS: WP 1.5 Task Containment Assessment Energy management system. Heat removal from damaged fuel and containment. Severe accident DEC with core damage. Identification of fuel damage sequences Possible need of a heat removal system from the containment after core damage.

May 22nd & 23rd 2007 Stockholm EUROTRANS: WP 1.5 Task Containment Assessment Structural Behaviour The Primary Containment structure shall be designed to assure adequate performance in all plant conditions considered in the design process and specifically in DBC, testing, and DEC.

May 22nd & 23rd 2007 Stockholm EUROTRANS: WP 1.5 Task Containment Assessment Protection against external hazards Natural external hazards The Containment System structures shall be designed to cope with the natural Hazards, including earthquakes. Man- made external hazards The Containment System shall be designed to cope with man- made external hazards without loss of its structural integrity. An aircraft crash will not prevent reactor safe shutdown. Therefore no significant release of fission products will occur inside the containment and two Barriers will be assured even if the containment design leakrate cannot be proven under these conditions.

May 22nd & 23rd 2007 Stockholm EUROTRANS: WP 1.5 Task Containment Assessment Biological shielding The Containment System shall be designed to limit, in all plant conditions, the exposure of on- site personnel and population to radiation generated by the primary circuit and associated systems. This function is accomplished mainly by concrete structures inside the Primary Containment and the containment concrete wall.

May 22nd & 23rd 2007 Stockholm EUROTRANS: WP 1.5 Task Containment Assessment Subtasks definition Conditions associated to representative events analysed (DBC and DEC) Subtask a Evaluation of analysed representative events in relation to any sequences that may imply radioactive releases and/or release of mass and energy from the reactor vessel or from other related systems, such as steam or feedwater pipe ruptures Subtask b Identification of potential severe accident scenarios and definition of associated conditions related to containment/confinement requirements Subtask c Evaluation of possible hydrogen generation and the eventual possibility of reaching explosive concentrations depending on the hydrogen mass generated and the free volume of locations in which it can accumulate. Subtask d Based on the above results, a list of potential initiators and accident/release sequences including the associated mass and energy release estimate will be elaborated under this subtask.

May 22nd & 23rd 2007 Stockholm EUROTRANS: WP 1.5 Task Containment Assessment Subtasks definition Source Term Behaviour Subtask a Bounding definition of potential releases to the containment and its behaviour on the basis of the different source term information available from Work Package and the above analyses Subtask b Fission products and Polonium transport mechanism will also be evaluated. Subtask c The potential dose to the operators and the environment from the above source terms will be calculated. Subtask d Recommendations, if required, for radioactive and fission product removal will be analysed.

May 22nd & 23rd 2007 Stockholm EUROTRANS: WP 1.5 Task Containment Assessment Subtasks definition Containment Requirements for the XT-ADS and EFIT Designs Subtask a Evaluation of containment function performance requirements for both designs, based on the data gathered from the above activities and WP 1.2 results Subtask b Evaluation of containment function taking into account the main features related to the following: Limitation of radionuclide releases (confinement function) Containment integrity Subtask c Evaluation of other features such as protection against external hazards, HVAC/Filtering requirements or biological shielding Subtask d Consideration of specific conditions that may be imposed on containment and confinement requirements

May 22nd & 23rd 2007 Stockholm EUROTRANS: WP 1.5 Task Containment Assessment Subtask Responsibilities The Task Partners are: KTH, FZK and EA The following split of responsibilities for the elaboration of Task deliverables is proposed: Subtask aFZK Subtask bKTH Subtask cKTH Subtask dEA Subtask aFZK/KTH Subtask bFZK/KTH Subtask cEA Subtask aEA Subtask bEA Subtask cEA Subtask d EA

May 22nd & 23rd 2007 Stockholm EUROTRANS: WP 1.5 Task Containment Assessment Deliverables to be issued under this Task: D1.63Report on Containment Assessment for XT-ADS Month 40 D1.65Report on Containment Assessment for lead cooled EFIT Month 40 Related Source Term reports: D1.62Report on Source Term Assessment for XT-ADS Month 33 D1.64Report on Source Term Assessment for EFIT Month 39 Convenient to have some preliminary information on source term in advance to start bounding dose calculations

May 22nd & 23rd 2007 Stockholm EUROTRANS: WP 1.5 Task Containment Assessment The following index, and input elaboration of responsibilities, is proposed for the Deliverables of this Task Deliverable Chapter 1Introduction and Purpose 2General Safety Criteria. Containment Criteria 3General Functions of the Containment 4Barriers Against the Release Of Radioactive Products 5DBC. Containment Design Requirements 6DEC. Containment Design Requirements 7Source Term Behaviour 8Summary of Containment Design Requirements Responsible EA ALL KTH/FZK EA

May 22nd & 23rd 2007 Stockholm EUROTRANS: WP 1.5 Task Containment Assessment Budget The assigned total budget allocation for Task is as follows: EA4 m/m FZK4 m/m KTH4 m/m