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Studies of Nuclear Fuel Performance Using On-site Gamma-ray Spectroscopy and In-pile Measurements
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, Nuclear Physics.
2006 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Presently there is a clear trend of increasing demands on in-pile performance of nuclear fuel. Higher target burnups, part length rods and various fuel additives are some examples of this trend. Together with an increasing demand from the public for even safer nuclear power utilisation, this implies an increased focus on various experimental, preferably non-destructive, methods to characterise the fuel.

This thesis focuses on the development and experimental evaluation of such methods. In its first part, the thesis presents a method based on gamma-ray spectroscopy with germanium detectors that have been used at various power reactors in Europe. The aim with these measurements is to provide information about the thermal power distribution within fuel assemblies in order to validate core physics production codes. The early closure of the Barsebäck 1 BWR offered a unique opportunity to perform such validations before complete depletion of burnable absorbers in Gd-rods had taken place. To facilitate the measurements, a completely submersible measuring system, LOKET, was developed allowing for convenient in-pool measurements to be performed.

In its second part, the thesis describes methods that utilise in-pile measurements. These methods have been used in the Halden test-reactor for determination of fission gas release, pellet-cladding interaction studies and fuel development studies.

Apart from the power measurements, the LOKET device has been used for fission gas release (FGR) measurements on single fuel rods. The significant reduction in fission gas release in the modern fuel designs, in comparison with older designs, has been demonstrated in a series of experiments. A FGR database covering a wide range of burnup, power histories and fuel designs has been compiled and used for fuel performance analysis. The fission gas release has been measured on fuel rods with average burnups well above 60 MWd/kgU. The comparison between core physics calculations (PHOENIX-4/POLCA-7) and the in-pool measurements of thermal power indicates that the nodal power can generally be predicted with an accuracy within 4% and the bundle power with an accuracy better than 2%, expressed as rms errors.

In-pile experiments have successfully simulated the conditions that occur in a fuel rod following a primary debris failure, being secondary fuel degradation. It was concluded that massive hydrogen pick-up takes place during the first few days following the primary failure and that a pre-oxidized layer does not function as a barrier towards hydriding in an environment with a very high partial pressure of hydrogen. Another series of in-pile experiments clearly indicate that increased UO2 grain size is an effective way of suppressing fission gas release in LWR fuel up to the burnup level covered (55 MWd/kgUO2).

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis , 2006. , p. 103
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 191
Keywords [en]
Nuclear physics, fission gas release, nuclear fuel, core physics, gamma-ray spectroscopy, LOKET, thermal power, burnup, fuel failure, validation, cladding
Keywords [sv]
Kärnfysik
Identifiers
URN: urn:nbn:se:uu:diva-6912ISBN: 91-554-6582-X (print)OAI: oai:DiVA.org:uu-6912DiVA, id: diva2:168460
Public defence
2006-06-07, Sal 2001, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 13:30
Opponent
Supervisors
Available from: 2006-05-16 Created: 2006-05-16 Last updated: 2021-06-18Bibliographically approved
List of papers
1. Developments in Gamma Scanning of Irradiated Nuclear Fuel
Open this publication in new window or tab >>Developments in Gamma Scanning of Irradiated Nuclear Fuel
1997 In: Applied Radiation and Isotopes, ISSN 0969-8043, Vol. 48, no 10-12, p. 1289-1298Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-94559 (URN)
Available from: 2006-05-16 Created: 2006-05-16Bibliographically approved
2. Fission Gas Release Determination Using an Anti-Compton Shield Detector
Open this publication in new window or tab >>Fission Gas Release Determination Using an Anti-Compton Shield Detector
Show others...
1998 (English)In: Nuclear Technology, ISSN 0029-5450, Vol. 122, no 3, p. 276-283Article in journal (Refereed) Published
Abstract [en]

Poolside measurements of fission gas release (FGR) in fuel pins have been made using gamma-ray spectroscopy with a Ge detector, measuring 85Kr activity in the fuel rod plenum. The gamma-ray energy spectra from irradiated nuclear fuel are characterized by prominent Compton distributions that can obscure the weak 514-keV 85Kr peak. To improve the sensitivity, the detector has been provided with an anti-Compton shield of six Bi3Ge4O12 detectors. Laboratory tests of the detector system showed that the maximum peak-to-Compton (p/c) ratio was improved by a factor of ~6. The results of the poolside measurement p/c ratio showed a somewhat smaller improvement (a factor of ~4) because of scattered gamma radiation from the surrounding material. However, the precision in the poolside FGR measurements was improved substantially utilizing the Compton shield.

Keywords
nuclear fuel, gamma-ray spectroscopy, anti-compton, fission gas release, FGR
National Category
Subatomic Physics
Research subject
Applied Nuclear Physics; Physics with specialization in Applied Nuclear Physics
Identifiers
urn:nbn:se:uu:diva-77326 (URN)10.13182/NT98-A2869 (DOI)
Available from: 2006-03-15 Created: 2006-03-15 Last updated: 2021-06-18
3. Fission Gas Release in ABB SVEA 10x10 BWR Fuel
Open this publication in new window or tab >>Fission Gas Release in ABB SVEA 10x10 BWR Fuel
1997 In: Proceedings from the International Topical Meeting on LWR Fuel Performance, Portland, Oregon, USA, march 2-5, 1997, 1997, p. 8-Chapter in book (Other academic) Published
Identifiers
urn:nbn:se:uu:diva-94561 (URN)
Available from: 2006-05-16 Created: 2006-05-16Bibliographically approved
4. Fission Gas Release in ABB SVEA-96/100 Fuel
Open this publication in new window or tab >>Fission Gas Release in ABB SVEA-96/100 Fuel
1997 In: Proceedings from the TopFuel '97 Conference, Manchester, UK, June 9-11, 1997, 1997, p. 9-Chapter in book (Other academic) Published
Identifiers
urn:nbn:se:uu:diva-94562 (URN)0 7277 2619 6 (ISBN)
Available from: 2006-05-16 Created: 2006-05-16Bibliographically approved
5. The shut-down of the Barseback 1 BWR: A unique opportunity to measure the power distribution in nuclear fuel rods
Open this publication in new window or tab >>The shut-down of the Barseback 1 BWR: A unique opportunity to measure the power distribution in nuclear fuel rods
2006 (English)In: Annals of Nuclear Energy, ISSN 0306-4549, E-ISSN 1873-2100, Vol. 33, no 13, p. 1091-1101Article in journal (Refereed) Published
Abstract [en]

Reactor poolside measurements of gamma radiation specific for the fission product La-140 (1596 keV) have been used for an experimental determination of axial power distributions in 55 nuclear fuel rods irradiated in the Barseback 1 BWR nuclear power plant. The measurements take advantage of the unique situation of a very short last reactor cycle of only three months due to the out-phasing of the reactor unit at November 30 1999. La-140 whose decay is controlled by the mother nuclide Ba-140 with the half-life 12.75 days reflects an average power distribution, representative for the latest weeks of core operation (in this case basically during November 1999). The measured intensities have been transformed into a 25 nodal representation to allow a precise and direct comparison with the corresponding calculated power distribution. The 55 rods were selected from two different fuel assemblies with average burn-ups of 1.9 and 9.7 MWd/ kgU, respectively (that is one fresh bundle and one slightly more than one cycle bundle). The stability and the linearity of the measurement system were evaluated. The linearity was checked using the two-source method. The stability was checked by recurrent measurements on a reference fuel rod. The results have been used in the validation of the pin power reconstruction model of Westinghouse 3D core simulator POLCA-7. The deviation between measured and calculated Ba-140 concentration (expressed as radial error) is typically a few percent on rod level. Results indicate that also Gd-rods are properly modelled over a broad range of conditions. It is indicated that predictions for fuel rods in their first month of operation are less accurate than for the rest of the rods.

National Category
Physical Sciences
Identifiers
urn:nbn:se:uu:diva-94563 (URN)10.1016/j.anucene.2006.07.007 (DOI)000242114100003 ()
Available from: 2006-05-16 Created: 2006-05-16 Last updated: 2017-12-14Bibliographically approved
6. On-site Gamma-ray Spectroscopic Measurements of Fission Gas Release in Irradiated Nuclear Fuel
Open this publication in new window or tab >>On-site Gamma-ray Spectroscopic Measurements of Fission Gas Release in Irradiated Nuclear Fuel
2007 (English)In: Applied Radiation and Isotopes, ISSN 0969-8043, E-ISSN 1872-9800, Vol. 65, no 1, p. 36-45Article in journal (Refereed) Published
Abstract [en]

An experimental, non-destructive in-pool, method for measuring fission gas release (FGR) in irradiated nuclear fuel has been developed. Using the method, a significant number of experiments have been performed in-pool at several nuclear power plants of the BWR type. The method utilises the 514 keV gamma-radiation from the gaseous fission product Kr-85 captured in the fuel rod plenum volume. A submergible measuring device (LOKET) consisting of an HPGe-detector and a collimator system was utilised allowing for single rod measurements on virtually all types of BWR fuel. A FGR database covering a wide range of burn-ups (up to average rod burn-up well above 60 MWd/kgU), irradiation history, fuel rod position in cross section and fuel designs has been compiled and used for computer code benchmarking, fuel performance analysis and feedback to reactor operators. Measurements clearly indicate the low FGR in more modern fuel designs in comparison to older fuel types.

Keywords
FGR database, fission gas release (FGR), fuel performance, fuel design, gamma-ray spectroscopy, krypton, LOKET
National Category
Physical Sciences
Identifiers
urn:nbn:se:uu:diva-94564 (URN)10.1016/j.apradiso.2006.07.004 (DOI)000242678800007 ()
Available from: 2006-05-16 Created: 2006-05-16 Last updated: 2017-12-14Bibliographically approved
7. LOKET- a Gamma-ray Spectroscopy System for In-pool Measurements of Thermal Power Distribution in Nuclear Fuel
Open this publication in new window or tab >>LOKET- a Gamma-ray Spectroscopy System for In-pool Measurements of Thermal Power Distribution in Nuclear Fuel
In: Nucl. Instrum. Meth. AArticle in journal (Refereed) Submitted
Identifiers
urn:nbn:se:uu:diva-94565 (URN)
Available from: 2006-05-16 Created: 2006-05-16Bibliographically approved
8. The integral fuel rod behaviour test IFA-597.3: Analysis of the measurements
Open this publication in new window or tab >>The integral fuel rod behaviour test IFA-597.3: Analysis of the measurements
1998 In: OECD Halden Reactor Project Work Report Series, no HWR-561, p. iv+29-Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-94566 (URN)
Available from: 2006-05-16 Created: 2006-05-16Bibliographically approved
9. The effect of fuel micro-structure and burn-up on FGR and PCMI studied in IFA-534.13
Open this publication in new window or tab >>The effect of fuel micro-structure and burn-up on FGR and PCMI studied in IFA-534.13
1998 In: OECD Halden Reactor Project Work Report Series, no HWR-546, p. iv+21-Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-94567 (URN)
Available from: 2006-05-16 Created: 2006-05-16Bibliographically approved
10. The Effect of Grain Size on FGR and PCMI in High Burnup Fuel (IFA-534.14) (Preliminary Results)
Open this publication in new window or tab >>The Effect of Grain Size on FGR and PCMI in High Burnup Fuel (IFA-534.14) (Preliminary Results)
1998 In: OECD Halden Reactor Project Work Report Series, no HWR-561, p. iv+7-Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-94568 (URN)
Available from: 2006-05-16 Created: 2006-05-16Bibliographically approved
11. The Effect of Grain Size on FGR and PCMI in High Burnup Fuel
Open this publication in new window or tab >>The Effect of Grain Size on FGR and PCMI in High Burnup Fuel
1999 In: OECD Halden Reactor Project Work Report Series, no HWR-558, p. iv+19-Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-94569 (URN)
Available from: 2006-05-16 Created: 2006-05-16Bibliographically approved
12. Reaction Kinetics of Oxidation and Hydriding Inside Operating Fuel Rods
Open this publication in new window or tab >>Reaction Kinetics of Oxidation and Hydriding Inside Operating Fuel Rods
1999 In: OECD Halden Reactor Project Work Report Series, no HWR-602, p. iv+29-Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-94570 (URN)
Available from: 2006-05-16 Created: 2006-05-16Bibliographically approved
13. Test-Reactor Study of the Phenomena Involved in Secondary Fuel Degradation
Open this publication in new window or tab >>Test-Reactor Study of the Phenomena Involved in Secondary Fuel Degradation
Show others...
2004 In: Proceedings of the 2004 International Topical Meeting on LWR Fuel Performance, Orlando, Florida, September 19-22, 2004, 2004, p. 15-Chapter in book (Other academic) Published
Identifiers
urn:nbn:se:uu:diva-94571 (URN)
Available from: 2006-05-16 Created: 2006-05-16Bibliographically approved

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