1. WP4 – Multi-phase flow THINS, Technical meeting - Bologna, 2/9/2010 Task 6.4 Assessment of damping pressure waves inside the SG WP6 – Lead Technology Experimental tests on LIFUS 5 facility M. Tarantino, A. Ciampichetti, D. Bernardi (ENEA)

2. WP4 – Multi-phase flow THINS, Technical meeting - Bologna, 2/9/2010  Definition of an experimental configuration representative of the SG of LFR reference configuration in conjunction with Task 3.2 (feedback needed)  Execution of the experimental campaign The experiment will be performed on a mock up as representative as possible of the bundle of the SG of LFR reference configuration with perforated outer thin and main shells, placed in a vessel (to be confirmed). Pressure evolution inside and outside the bundle at different heights will be measured, as well the capability of the perforated thin shell to mitigate the pressure transient inside the vessel. Proposed activity

3. WP4 – Multi-phase flow THINS, Technical meeting - Bologna, 2/9/2010 LIFUS 5 plant available at ENEA-Brasimone will be adopted to carry out the experiment. In addition to a new test section, also the water injection system will be modified and the instrumentation will be improved. LIFUS 5 Facility

4. WP4 – Multi-phase flow THINS, Technical meeting - Bologna, 2/9/2010 Test n.1Test n.2ELSY 1Test n.3Test n.4ELSY 2 Reaction system Initial one: S1+ S5 Only S1 (S5 eliminated) S1 directly connected to S3 Water injection pressure 70 bar6 bar185 bar40 bar 185 bar LBE temperature 350 °C 400 °C350 °C 400 °C Free volume/LBE volume 5% 20% S1 completely filled 20% Water injector penetration in S1 80 mm 5 mm 255 mm Initial pressure peak 20 bar2.8 bar34.5 bar14 bar 34 bar Maximum pressure* 78 bar6.7 bar32 bar22 bar11 bar24 bar Minimum temperature 263 °C160 °C154 °C147 °C160 °C152 °C Injected water Measure not reliable 0.06 kg 3.04 kg 1.17 kg1.47 kg Measure not reliable LBE moved to S3 --210 kg270 kg141 kg123 kg Background Main operating conditions of the past experiments carried out in the frame of EUROTRANS and ELSY projects Pressure transient detected in the test section during test ELSY 1

5. WP4 – Multi-phase flow THINS, Technical meeting - Bologna, 2/9/2010 Performed activity NEW sealing system (Garlock HELICOFLEX gasket HN200) OLD sealing system (metallic Ring Joint) Lower tightening force → no needs for special tools (superbolts) Easier and faster operations → time reduction between successive tests Modification of the sealing system of the vessel flange:

6. WP4 – Multi-phase flow THINS, Technical meeting - Bologna, 2/9/2010 Design of the new water injection system Water injector LBE charge/drain Water injection and LBE filling/draining will be both performed through the same axial penetration at the bottom of the vessel OLD concept NEW concept

7. WP4 – Multi-phase flow THINS, Technical meeting - Bologna, 2/9/2010 Design of the new water injection system NEW concept Solution #1 Solution #2 water LBE water Engineering design is ongoing

8. WP4 – Multi-phase flow THINS, Technical meeting - Bologna, 2/9/2010 OLD concept Design of the new water injection system Disadvantages: - difficult to control the injection parameters (injection pressure and duration, mass of water injected,… ) - long time between successive experiments due to the long pre-test operations of the injector device  Tube in AISI 316 (or brass) with machined carving with resistant thickness calibrated to break at the desired pressure  Pneumatic valve for injection triggering

9. WP4 – Multi-phase flow THINS, Technical meeting - Bologna, 2/9/2010 Design of the new water injection system Use of pyrotechnic valves to trigger and stop the injection - Very fast opening and closing time compared to pneumatic valves (few ms vs 200-300 ms) → precise control of the injection time - Possibility to put the valve close to the injection point → lower pressure losses in the injection line, reduction of dynamic effects (first peak related to hammer effect) - Well-defined injection pressure

10. WP4 – Multi-phase flow THINS, Technical meeting - Bologna, 2/9/2010 Design of the new water injection system Activity is ongoing at ENEA Brasimone to test and qualify available pyrotechnic valves produced by PYROMECA, already used in the past in experiments with Na Normally Open Normally Closed

11. WP4 – Multi-phase flow THINS, Technical meeting - Bologna, 2/9/2010 Instrumentation and control/DAQ system A complete revision of the instrumentation and control/acquisition system is underway. An analysis has been done to assess the type of measurements required for the project leading to the following set of instrumentation devices :  A new arrangement of TCs is being conceived  Fast pressure tranducers  Strain gauges on the inner vessel walls (if possible)  A level transducer in the water vessel for the precise measurement of the water injected  An ultrasound flow rate transducer placed on the water line (to be qualified on the basis of the one installed on the NACIE loop)

12. WP4 – Multi-phase flow THINS, Technical meeting - Bologna, 2/9/2010 Instrumentation and control/DAQ system The possibility to use high T strain gauges applied on the internal vessel walls is still under evaluation due to the difficulty to find devices able to work in liquid metal However, some technological solutions are under study to overcome this difficulty

13. WP4 – Multi-phase flow THINS, Technical meeting - Bologna, 2/9/2010 Schedule of the activities  After the feedback coming from Task 3.2, the new test section will be designed and built up  By the end of 2010, the new water injection system will be completed and preliminarly tested  Instrumentation and control/DAQ system will be designed and implemented by the middle of 2011 WARNING: It is mandatory to have as soon as possible a conceptual design of the test section from Task 3.2