IP EUROTRANS Lyon on 10.10.2006

WP1.5 meeting

Status source term + SGTR

Johan Carlsson

IP EUROTRANS Lyon on 10.10.2006

Impact of iodine, caesium and caesium iodine in Pb-Bi System

Experiment executed at FZKObjective was to find out if the Pb-Bi liquid metals would contain the released iodine, caesium, and caesium iodide. And, to see which quantities and substances that could arise as vapours.

IP EUROTRANS Lyon on 10.10.2006

Tests performedTest no. Substance Temperature Description Weighed

volume, Pb-Bi/g

Weighed volume, substance/g

Conc./wt.ppm

1 I 400 ºC Test w 0.09 g/kg 1001.62 0.09112 90.96

2 I 600 ºC Test w 0.09 g/kg 1000.61 0.09601 95.94

3 CsI 400 ºC Test w 0.09 g/kg 1018.94 0.09169 89.98

4 CsI 600 ºC Test w 0.09 g/kg 1002.79 0.09090 90.64

5 Cs 600 ºC Test w ~1.2 g/kg 834.85 1.0 1196.4

6 Cs 700 ºC Test w ~1.2 g/kg 835.5 1.0 1195.5

IP EUROTRANS Lyon on 10.10.2006

• Test 1 (400 ºC, 0.09 g I)– No iodine detected

• Test 2 (600 ºC, 0.09 g I)– The membrane did not seal good enough probably and the I sublimated

• Test 3 (400 ºC, 0.09 g CsI)– No CsI detected.

• Test 4 (600 ºC, 0.09 g CsI)– No CsI detected.

• Test 5 (600 ºC, 1.2 g Cs)– Shorter duration of heating than planned. No Cs detected.

• Test 6 (700 ºC, 1.2 g Cs)– Shorter duration of heating than planned. No Cs detected in collected

liquids.

IP EUROTRANS Lyon on 10.10.2006

Planned tests

Further experiments are planned with Cs and I at 800ºC and 900ºC. The contract has been signed at JRC and sent to FZK. Execution of experiments are planned within a year.

Possibly more experiments can be performed by NRG in the hot cells of the HFR. It would be a fuel pellet that is melted to 1700 ºC. And it would be covered by Pb or Pb-Bi. All volatile fission products would be investigated.

IP EUROTRANS Lyon on 10.10.2006

Summary source term

The first tests up to 600ºC indicates that I, CsI, and Cs remain in the Pb-Bi and probably form lead iodide and bismuth iodide.

Cs forms an intermetallic compound, this immobilization by alloying is highly probable.

Because of experimental limitations, no demonstration of I retention at 600 ºC was possible. The new tests be performed in improved test rig at temperatures of 800 and 900ºC.

Other experiments are considered in a hot cell of NRG.

IP EUROTRANS Lyon on 10.10.2006

• performed with CFX10• 3D geometry of a quarter of the

reactor vessel based on preliminary ELSY design

• Incompressible Pb, compressible steam. Isothermal (700 K). Volume of Fluid.

• One steam pipe contains 22 liters ~8 kg supercritical steam ( = 348 kg/m3; @221 bar,647 K)

• So far a constant injection rate of 0.3 kg/s of steam (point source, no phase change)

Steam Generator Tube Rupture

IP EUROTRANS Lyon on 10.10.2006

velocity field normal operation

IP EUROTRANS Lyon on 10.10.2006

density field 0-2.5 seconds

IP EUROTRANS Lyon on 10.10.2006

velocity field 0-2.5 seconds