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Task 6.4 Assessment of damping pressure waves inside the SG

WP6 – Lead Technology. Task 6.4 Assessment of damping pressure waves inside the SG. Experimental tests on LIFUS 5 facility. M. Tarantino, A. Ciampichetti, D. Bernardi (ENEA). Proposed activity.

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Task 6.4 Assessment of damping pressure waves inside the SG

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  1. WP6 – Lead Technology Task 6.4 Assessment of damping pressure waves inside the SG Experimental tests on LIFUS 5 facility M. Tarantino, A. Ciampichetti, D. Bernardi (ENEA)

  2. Proposed activity • 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.

  3. LIFUS 5 Facility 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.

  4. 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. Performed activity Modification of the sealing system of the vessel flange: Lower tightening force → no needs for special tools (superbolts) Easier and faster operations → time reduction between successive tests NEW sealing system (Garlock HELICOFLEX gasket HN200) OLD sealing system (metallic Ring Joint)

  6. Design of the new water injection system 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 Water injector LBE charge/drain

  7. Design of the new water injection system Solution #1 Solution #2 NEW concept LBE Engineering design is ongoing LBE water water

  8. Design of the new water injection system OLD concept • Tube in AISI 316 (or brass) with machined carving with resistant thickness calibrated to break at the desired pressure • Pneumatic valve for injection triggering 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

  9. 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. 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 Closed Normally Open

  11. 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. 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. Schedule of the activities • After the feedback comingfrom Task 3.2, the new test sectionwillbedesigned and built up • By the end of 2010, the new water injection system willbecompleted and preliminarlytested • Instrumentation and control/DAQ system will be designed and implemented by the middle of 2011 • WARNING: Itismandatorytohaveassoonaspossible a conceptual design of the test sectionfrom Task 3.2

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