WP4 – Multi-phase flow THINS, Technical meeting - Bologna, 2/9/2010 Task 6.4 Assessment of damping...

WP4 – Multi-phase flow THINS, Technical meeting - Bologna, 2/9/2010

Task 6.4Task 6.4Assessment of damping pressure waves inside the SGAssessment of damping pressure waves inside the SG

WP6 – Lead Technology

Experimental tests on LIFUS 5 facility Experimental tests on LIFUS 5 facility

M. Tarantino, A. Ciampichetti, D. Bernardi M. Tarantino, A. Ciampichetti, D. Bernardi (ENEA)(ENEA)


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


S2

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


Test n.1 Test n.2 ELSY 1 Test n.3 Test n.4 ELSY 2

Reaction system Initial one:

S1+ S5

Only S1(S5

eliminated)

S1 directly connected

to S3


to S3


to S3


to S3

Water injection pressure 70 bar 6 bar 185 bar 40 bar 40 bar 185 bar

LBE temperature 350 °C 350 °C 400 °C 350 °C 350 °C 400 °C

Free volume/LBE volume 5% 20% 20%

S1 completely

filled20% 20%

Water injector penetration in S1 80 mm 80 mm 5 mm 5 mm 5 mm 255 mm

Initial pressure peak 20 bar 2.8 bar 34.5 bar 14 bar 14 bar 34 bar

Maximum pressure* 78 bar 6.7 bar 32 bar 22 bar 11 bar 24 bar

Minimum temperature 263 °C 160 °C 154 °C 147 °C 160 °C 152 °C

Injected water

Measure

not

reliable

0.06 kg 3.04 kg 1.17 kg 1.47 kg

Measure

not

reliable

LBE moved to S3 - - 210 kg 270 kg 141 kg 123 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


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:


Design of the new water injection system

S2

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



NEW concept

Solution #1 Solution #2

water

LBE

LBE

water

Engineering design is ongoing


OLD concept


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



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



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


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)


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


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

WP4 – Multi-phase flow THINS, Technical meeting - Bologna, 2/9/2010 Task 6.4 Assessment of damping...

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