Gas Plenum in XT-ADS Fuel Rod. V. Sobolev, B. Arien SCK·CEN, Boeretang 200, Mol, Belgium. Introduction. During the DM1 Meeting in MOL it was required to adapt the gas plenum of XT-ADS fuel rod to assure the cladding withstand during 30 minutes at ULOF conditions at 100 % FG release.
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
V. Sobolev, B. Arien
SCK·CEN, Boeretang 200, Mol, Belgium
Best estimate values from the CIEMAT creep experiment with T91 steel (D. Struwe, W. Pfrang, Mol, 20-21 June 2006)
Gas plenum pressure 5 MPa 10 MPa
Clad failure time Mid-wall clad temperature
10 000 h 955 K 920 K
1 000 h 985 K 955 K
10 h 1065 K 1030 K
1 h 1115 K 1070 K
30 min 1125 K 1080 K
2 min 1180 K 1135 K
Fuel pellet OD=5.40 ID=1.60
Cladding OD=6.55 ID=5.60
1200 (?)2. XT-ADS fuel pin schematics (pre-design of June 2006)
Operation at nominal power:
- released fraction of the i-th gas
= 90 K x 1.375 = 123.75 K (°C)
Nominal operation at BOL (FEMAXI-5.1- mod.SCK; EFR TC )
ULOF at BOL (FEMAXI-5.1- mod.SCK)
Pressure and free volumes (cm³) within the main segments of the hottest fuel rod
The max. clad temperature at ULOF is 1117 K (844 °C) without clad corrosion, and the allowed pressure (Table on Slide 3, D. Struwe) is lower than 7.5 MPa.
Clad corrosion will create more severe situation (see next slide).
dcorr ~85 µm
It has been postulated that the maximum thickness of the corrosion layer is 10 % of the initial clad thickness, i.e. 47.5 microns
Note: ULOF becomes very unlikely is spallation loop pump and PHXs are supplied by the same electrical circuit