Fusion for Energy: development of invessel dust measurement techniques
Deadline:
5 februari 2010
Inhoud & doelstellingen:
General Background and Needs of the Joint Undertaking
The European Joint Undertaking for ITER and the Development of Fusion Energy, (hereinafter "Fusion for Energy" or "F4E" or "the Joint Undertaking") is a joint undertaking created under the Euratom Treaty by a decision of the Council of the European Union 1. It provides the contribution of Euratom to the ITER international fusion organisation, e.g. with regard to scientific and technological research and development activities.
Specific Details on this Action
Inside a Tokamak Vacuum Vessel (V.V), Plasma Wall Interaction phenomena induce dust production. Due to radiological and explosion risks pointed out by safety evaluation studies, the accumulation of dust in the V.V could significantly impact the operation of ITER. According to the present strategy, operation will have to be stopped when reaching an in-vessel dust limit. Therefore in view of ITER licensing and operation, there is an urgent need to develop 1 Council Decision (Euratom) No 2007/198 of 27 March 2007 establishing the European Joint Undertaking for ITER and the Development of Fusion Energy and assess techniques allowing the monitoring of dust and dust removal. The subject of this technical specification is to perform R&D tasks on dust measurement techniques.
In particular,
Divertor Erosion Monitor system (DEM)
Erosion of material from the divertor targets in ITER will represent one of the largest sources of dust in the vessel. Measurement of the net erosion (i.e. erosion and local redeposition), will provide a useful indicator for the total in-vessel dust inventory. Consequently a DEM system has been recently included into the ITER baseline, subject to satisfactory evaluation of its performance. The objective is, using an optical technique, to allow the measurement of material erosion and deposition occurring on vertical targets of the ITER divertor. A specific task is to evaluate the technical feasibility of making this measurement; identify and select technical options; demonstrate that integration of a DEM is practical and estimate system costs.
Capacitive Diaphragm Monitor (CDM)
Limits for the total mass of the in-vessel dust inventory are defined by ITER safety and operational considerations. Previous studies have indicated that the only practical approach to measuring this quantity is by extrapolation from a large number of local measurements. The best candidate sensor for the ITER environment appears to be a CDM and an array of such sensors has been recently included into the ITER baseline, subject to satisfactory evaluation. The CDM relies on measuring the change in capacitance between a thin diaphragm and a reference electrode as the diaphragm distorts under the weight of dust accumulated on its surface. A specific task is to evaluate the technical feasibility of making this measurement; demonstrate that integration of a CDM is practical and estimate system costs.
Hot dust measurement using water vapour injection
The production of hydrogen by chemical interactions of beryllium dust on hot surfaces within the tokamak with water vapour introduced during loss of coolant accidents (LOCA) and simultaneous air ingress could lead to the production of a potentially explosive hydrogen/oxygen mix in the Vacuum Vessel (V.V.) A conceptually simple and direct way to evaluate the likely hydrogen production is to intentionally introduce a known, small quantity of water vapour into the V.V. and measure the hydrogen produced, allowing extrapolation to the water vapour ingress expected in a LOCA event. A specific task is to evaluate the technical
feasibility of making this measurement. In order to pursue the above objectives and in compliance with its defined scope, F4E intends
to initiate a grant agreement with one or more beneficiaries.
Budget:
Maximum Fusion for Energy's Contribution: € 480,000.00 (four hundred and eighty thousand euro)
Indicative maximum contribution per each of the three tasks is as follows:
- Task1: 144,000 €
- Task2: 224,000 €
- Task3: 112,000 €
According to the Model Grant Agreement 2 the financial contribution of the Joint Undertaking may reach a maximum of:
a) 40% of the total eligible costs for research and technological development activities
b) 40% of the total eligible costs for demonstration activities
c) 100% of the total eligible costs for management activities
d) 100% of the total eligible costs for other specific activities.
The maximum pre-financing normally considered for the present action(s) is 40% of the total F4E contribution. Applicants wishing to request a larger pre-financing share shall detail the motivation in their proposal, and may be required to lodge suitable financial guarantee for the pre-financing before receiving the first payment.
Info & contact:
Meer lezen:
http://fusionforenergy.europa.eu/Grants.htm
Mr. Paul Marshall, +34.93.489 7456, paul.marshall@f4e.europa.eu
In case of absence:
Mr. William De Cat, +34.93.489 7473, william.decat@f4e.europa.eu
Contactpersoon in Vlaanderen:
Vanderperren Griet
Business Support Unit Officer
Studiecentrum voor Kernenergie
Boeretang 200
2400 Mol
T 014332901
E gvanderp@sckcen.be
