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NEA-1685 IFPE/IFA-597.3.

IFPE/IFA-597.3, centre-line temperature, fission gas release and clad elongation at high burn-up (60-62 MWd/kg)

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1. NAME OF EXPERIMENT:  IFPE/IFA-597.3.
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2. COMPUTERS
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Program name Package id Status Status date
IFPE/IFA-597.3 NEA-1685/02 Arrived 23-APR-2003

Machines used:

Package ID Orig. computer Test computer
NEA-1685/02 Many Computers
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3. DESCRIPTION


The fuel segments for the high burn-up integral rod behaviour test IFA-597 were taken from fuel rod 33-25065, which was irradiated in the Ringhals 1 BWR for approximately 12 years. The irradiation of this rod and its sibling rod 33-25046 was performed in two stages. During the first irradiation, 1980 to 1986, the rods were part of Ringhals assembly 6477 and an approximate rod averaged burn-up of 31 MWd/kgUO2 was reached. The rods were then placed into fuel assembly 9902 for a second period of irradiation from 1986 to 1992. The location of the fuel rods 33-25065 and 33-25046 in this assembly were in positions 9902/D5 and 9902/E4 respectively. A final rod averaged burn-up of 52 MWd/kgUO2 was achieved. The burn-up at the location of the Halden segments was estimated as 59 MWd/kgUO2, well beyond the the formation of High Burn-up Structure (HBS) formation at the pellet rim. At the rim, the burn-up was estimated as 130 MWd/kgUO2.

After commercial irradiation, PIE was performed at Studsvik. Inner and outer clad oxide thickness measurements were 42 and 5 microns respectively. The measured cold rod diameter varied between 12.20 and 12.25 mm, thus only a small amount of creepdown had occurred from the original diameter of 12.25 mm.  Cold gap measurements were taken by diametral compression of the clad onto the fuel. The stiffness changes twice during these measurements, the first (relocated gap) associated with the onset of pellet fragment movement, the second (compressed gap) when the fragments are together and the pellet is compressed. For these rods, the compressed diametral gap was measured as 30 microns.  This is in agreement with the pellet and cladding being in contact during the final irradiation cycle, i.e., at ~12 kW/m.  FGR measurements were made after puncturing and values of 2.5%-3.3% were calculated from the extracted gas. The uncertainty is due to different methods of calculation. Ceramographyshowed a normal crack pattern and no evidence of grain boundary porosity in the central regions of the pellet. The back scattered electron image of the pellet periphery showed an area of high porosity as would be associated with re-structuring caused by formation of the HBS. The depth of this region was typically 200 microns with traces of HBS at greater depths.

After transfer to Kjeller hot laboratories in Norway, three segments were cut from rod D5 33-25065. All were from regions of uniform burn-up as measured by axial gamma scanning.  The sections were identified as D5:1, rod 7, D5:2, rod 8 and D5:3, rod 9. Whilst drilling rod 7 to insert a thermocouple, the drill broke and thermocouple insertion was abandoned. The rod was finally sealed with a clad elongation detector (EC). Rods 8 and 9 were successfully drilled and thermocouples inserted. They were then sealed with pressure transducers (PF).

Rods 8 and 9 were loaded into positions 2 and 5 in IFA-597.2 (second loading) and irradiated in Halden for some 20 days in  July 1995. After a small number of power ramps,  rod 9 failed and the assembly withdrawn. During this time, useful data were generated on centreline temperature as a function of power.

Rod 9 was removed and replaced by rod 7. The assembly was returned to the reactor as IFA-597.3 (third loading); the irradiation started in January 1997  and continued to May of that year having accrued a further ~2 MWd/kgUO2. Data obtained included, centreline temperature as a function of power and burn-up, (rod 8), FGR from the increase in rod internal pressure (rod 8) and clad elongation (rod 7).

The assembly was discharged and transported to Kjeller for PIE. FGR of 12.6% and 15.8% were measured from puncturing and gas extraction from rods 7 and 8 respectively.

Further PIE was carried out on rod 8 after it had been transported to Studsvik.  Here, additional ceramography was performed, axial gamma scans, radial scans of selected fission products and the radial porosity distribution.

On account of the high burn-up of these rods, the data are particularly valuable for modelling fuel temperatures, FGR and PCMI.
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9. STATUS
Package ID Status date Status
NEA-1685/02 23-APR-2003 Arrived at NEADB
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10. REFERENCES
NEA-1685/02, included references:
- M. Vankeerbergen:
The Integral Fuel Rod Behaviour Test IFA-597.2: Pre-characterization and
Analysis of measurements,
Halden report HWR-442, March 1996
- I. Matsson and J.A. Turnbull:
The integral fuel rod behaviour test IFA-597.3: Analysis of the Measurements,
Halden report HWR-543, January 1998
- K Malen et al:
PIE of high burn-up BWR fuel rod IFA-597.3 rod 8", reported in Halden report,
HRP-356/18
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12. PROGRAMMING LANGUAGE(S) USED

No item found

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15. NAME AND ESTABLISHMENT OF AUTHORS

   OECD Halden Reactor Project
   Institutt for Energiteknikk
   P.O. Box 173
   N-1751 HALDEN
   Norway   

   Compilation: J.A. Turnbull, UK

These data were released within the FUMEX-II project.
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16. MATERIAL AVAILABLE
NEA-1685/02
SUMMARY.TXT Text file giving a description of the irradiation and results
PRE-CHAR.TXT     Pre characterization data
QAREP597.DOC QA Report
README.TXT Readme file
597-R7.HIS Irradiation histories for re-instrumented rod 7
597-R8.HIS Irradiation histories for re-instrumented rod 8
597-R9.HIS Irradiation histories for re-instrumented rod 9
597-TFS.R8  Temperature vs. power for rod 8 during first 4 ramps IFA-597.2
597-TFS.R9  Temperature vs. power for rod 9 during first 3 ramps IFA-597.2
597-TFE.R8  Temperature vs. power for rod 8 at end of irradiation, IFA-597.3
597-TFL.R8  Temperature vs. rod average burn-up, rod 8 IFA-597.3
597-FGR.R8  FGR vs. rod averaged burn-up, rod 8 from presure in IFA-597.3
597-EC.R7  Clad elongation vs. rod average burn-up, rod 7 in IFA-597.3
PIE.TXT   File containing PIE data (revised in April 2003)
STU-U  EPMA radial scan of Uranium
STU-CE   EPMA radial scan of Cerium
STU-PU EPMA radial scan of Plutonium
STU-XE EPMA radial scan of Xenon
STU-BU  Burn-up distribution derived from Ce measurements
STU-PO  Radial distribution of porosity
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17. CATEGORIES
  • Y. Integral Experiments Data, Databases, Benchmarks

Keywords: burnup, cladding, fission gas release, fuels.