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EELS and electron diffraction studies on possible bonaccordite crystals in pressurized water reactor fuel CRUD and in oxide films of alloy 600 material
Studsvik Nuclear AB, Sweden.
RISE - Research Institutes of Sweden, Swerea, Swerea KIMAB.
Electric Power Research Institute, USA.
Ringhals AB, Sweden.
2017 (English)In: Nuclear engineering and technology : an international journal of the Korean Nuclear Society, ISSN 1738-5733, E-ISSN 2234-358X, Vol. 49, no 4, p. 668-674Article in journal (Refereed) Published
Abstract [en]

Experimental verification of boron species in fuel CRUD (Chalk River Unidentified Deposit) would provide essential and important information about the root cause of CRUD-induced power shifts (CIPS). To date, only bonaccordite and elemental boron were reported to exist in fuel CRUD in CIPS-troubled pressurized water reactor (PWR) cores and lithium tetraborate to exist in simulated PWR fuel CRUD from some autoclave tests. We have reevaluated previous analysis of similar threadlike crystals along with examining some similar threadlike crystals from CRUD samples collected from a PWR cycle that had no indications of CIPS. These threadlike crystals have a typical [Ni]/[Fe] atomic ratio of ∼2 and similar crystal morphology as the one (bonaccordite) reported previously. In addition to electron diffraction study, we have applied electron energy loss spectroscopy to determine boron content in such a crystal and found a good agreement with that of bonaccordite. Surprisingly, such crystals seem to appear also on corroded surfaces of Alloy 600 that was exposed to simulated PWR primary water with a dissolved hydrogen level of 5 mL H2/kg H2O, but absent when exposed under 75 mL H2/kg H2O condition. It remains to be verified as to what extent and in which chemical environment this phase would be formed in PWR primary systems.

Place, publisher, year, edition, pages
2017. Vol. 49, no 4, p. 668-674
Keywords [en]
Alloy 600, AOA, Bonaccordite, CIPS, EDS, EELS, Electron Diffraction, FIB, Fuel CRUD, Oxide Film, PWR, TEM
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-30894DOI: 10.1016/j.net.2017.04.001Scopus ID: 2-s2.0-85020065106OAI: oai:DiVA.org:ri-30894DiVA, id: diva2:1139125
Note

Funding details: EPRI, Electric Power Research Institute; Funding text: Ms Charlotta Obitz and Dr Petter Andersson (Studsvik) prepared the TEM grids from fuel CRUD samples, and Mr Johan Stjärnsäter performed the autoclave exposure of the CT sample used for this work. Professor Lyubov Belova and Dr Anastasia Riazanova performed TEM lamella liftout with FIB/SEM. Final support by Electric Power Research Institute (USA), Ringhals AB (Sweden) and Swedish Radiation Safety Authority is gratefully acknowledged.

Available from: 2017-09-06 Created: 2017-09-06 Last updated: 2017-09-06Bibliographically approved

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