1. Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft 1 J. Stuckert, FZK/IMF-III11 th International QUENCH Workshop, Karlsruhe, October 25-27, 2005 Status of the QUENCH-11 test preparations: first pre-test results J. Stuckert, W. Hering, C. Homann, J. Moch, L. Sepold, U. Stegmaier, M. Steinbrück Presented by J. Stuckert FZ Karlsruhe, Germany

2. Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft 2 J. Stuckert, FZK/IMF-III11 th International QUENCH Workshop, Karlsruhe, October 25-27, 2005 Objectives Three non-destructive pre-tests: Q-11v1, Q-11v2, Q-11v3. The first two pre-tests are used to get familiar with the dynamic behavior of the water-filled bundle, auxiliary heater, and the associated heat-losses to the containment. Q-11v1: Calibration of the heat balance, compensation of lateral losses in the lower plenum and entry pipes. Testing of the cooling temperature control of the off-gas pipe, the upper plenum, and the upper electrode zone. Become familiar with accuracy under low evaporation. Q-11v2: Slowly raise power of the auxiliary heater to check the power level at which flashing can be detected. Temperature up to 600 K. Q-11v3 is intended to perform QUENCH-11 boil-off and heat-up phase up to 1350 K, to check system behavior, bundle response, and controllability.

3. Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft 3 J. Stuckert, FZK/IMF-III11 th International QUENCH Workshop, Karlsruhe, October 25-27, 2005 Preparation of the high temperature thermocouples. Typical fabrication defects of the tungsten - rhenium wires. Detected defects complicate the fabrication process but dont produce the measurement errors. bulk cracks inside TC wire voids at TC wire surface

4. Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft 4 J. Stuckert, FZK/IMF-III11 th International QUENCH Workshop, Karlsruhe, October 25-27, 2005 first delivery (hard): second delivery (friable): coarse grains, as result: damaged TC wires during TC fabrication fine grains – no damaged TC wires by TC fabrication TC fabrication problem, connected with choice of HfO 2 insulation tubes

5. Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft 5 J. Stuckert, FZK/IMF-III11 th International QUENCH Workshop, Karlsruhe, October 25-27, 2005 QUENCH-11 facility new features 0…4 g/s 100…120 °C ~75 °C

6. Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft 6 J. Stuckert, FZK/IMF-III11 th International QUENCH Workshop, Karlsruhe, October 25-27, 2005 auxiliary inner heater at bundle foot; large surface for good heat transfer bundle foot with inserted aux. heater and attached outer heater Installed bundle foot with insulated outer heater QUENCH-11: heating at bundle foot

7. Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft 7 J. Stuckert, FZK/IMF-III11 th International QUENCH Workshop, Karlsruhe, October 25-27, 2005 Outcome of the pre-test Q-11v1 No essential problems with tested components. External heating power of ~200 W at bundle foot surface is sufficient to keep surface temperature rather constant. No fluid flashing was observed with the inner auxiliary heater up to a power of 3.2 kW. Stable steam production rate of 1 g/s ± 10 % (boil-off velocity ~ 0.3 mm/s) could be achieved. Power control of auxiliary heater was reliable and benign. Water level measurement with sensor L 501 had some drift. Inlet temperature of the water dosage system could be maintained at 95°C.

8. Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft 8 J. Stuckert, FZK/IMF-III11 th International QUENCH Workshop, Karlsruhe, October 25-27, 2005 before Q-11v2: filling of bundle and check of thermocouples response with rising water level

9. Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft 9 J. Stuckert, FZK/IMF-III11 th International QUENCH Workshop, Karlsruhe, October 25-27, 2005 Q-11v2: electrical power during the test consisting of two sources: 1) DC generator for heated rods; 2) auxiliary heater at the bundle foot.

10. Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft 10 J. Stuckert, FZK/IMF-III11 th International QUENCH Workshop, Karlsruhe, October 25-27, 2005 Q-11v2: 1) Heat-up water to nearly saturation and evaporation. 2) DC power decrease to limit bundle temperature increase. saturated water (120°C @ 2 bar) steam at elevation 850 mm quench water 19 g/s

11. Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft 11 J. Stuckert, FZK/IMF-III11 th International QUENCH Workshop, Karlsruhe, October 25-27, 2005 Q-11v2: 1) increase auxiliary heater power to reach a constant boil-off rate of 1 g/s. 2) start additional water injection of 1 g/s to compensate the evaporated water.

12. Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft 12 J. Stuckert, FZK/IMF-III11 th International QUENCH Workshop, Karlsruhe, October 25-27, 2005 Q-11v2: drop of boiling water level – delayed reaction of thermocouples due to two-phase region 850 mm TC at 850 mm delay 500 mm

13. Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft 13 J. Stuckert, FZK/IMF-III11 th International QUENCH Workshop, Karlsruhe, October 25-27, 2005 Q-11v2: derivative of water level sensors readings in bundle and in collector of the condensed water. Signals with very intensive noise because boiling water.

14. Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft 14 J. Stuckert, FZK/IMF-III11 th International QUENCH Workshop, Karlsruhe, October 25-27, 2005 Q-11v2: averaging (step 50) of water level sensors readings – detection of the evaporation rate quench water aux. water

15. Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft 15 J. Stuckert, FZK/IMF-III11 th International QUENCH Workshop, Karlsruhe, October 25-27, 2005 Q-11v2: comparison of different methods to measure the evaporation rate. Good accordance between bundle water level sensor and mass spectrometer data. Delay of condensed water sensor response due to difference in measurement locations.

16. Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft 16 J. Stuckert, FZK/IMF-III11 th International QUENCH Workshop, Karlsruhe, October 25-27, 2005 Outcome of the pre-test Q-11v2 Calibration of water level and TC positions by slow fill-up of bundle with water (50°C, 2 g/s) was performed and showed good correspondence between water level sensor (L 501) and TC reactions for water below saturation. The water in the bundle was brought to nearly saturation (2 bar, 120°C) with aux. heater (2.2 kW) and DC generator (2 kW) Boil-off conditions were started with ~5.5 kW DC generator and 1 kW aux. heater and lasted ~800 s. Boil-off rate of 1 g/s was stabilised with 2 kW DC generator and a stepwise increase of aux. power to 2.9 kW during the following ~2200 s. The evaporated water was compensated with the auxiliary water injection of 1 g/s (95 °C). Therewith the water level was stabilised at about -150 mm during following ~700 s. After reaching the maximum bundle temperature of 330 °C (~3800 s after the test begin) reflood with 19 g/s water was initiated. The mass-spectrometer data were in good agreement with other bundle instruments. The next pre-test Q-11v3 will be started with steady-state conditions of Q-11v2. It is intended to perform the QUENCH-11 boil-off, heat-up, and quench phase, but only up to 1350 K.