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Tytuł pozycji:

EELS and electron diffraction studies on possible bonaccordite crystals in pressurized water reactor fuel CRUD and in oxide films of alloy 600 material

Tytuł:
EELS and electron diffraction studies on possible bonaccordite crystals in pressurized water reactor fuel CRUD and in oxide films of alloy 600 material
Autorzy:
Jiaxin Chen
Fredrik Lindberg
Daniel Wells
Bernt Bengtsson
Temat:
Alloy 600
AOA
Bonaccordite
CIPS
EDS
EELS
Electron Diffraction
FIB
Fuel CRUD
Oxide Film
PWR
TEM
Nuclear engineering. Atomic power
TK9001-9401
Źródło:
Nuclear Engineering and Technology, Vol 49, Iss 4, Pp 668-674 (2017)
Wydawca:
Elsevier, 2017.
Rok publikacji:
2017
Kolekcja:
LCC:Nuclear engineering. Atomic power
Typ dokumentu:
article
Opis pliku:
electronic resource
Język:
English
ISSN:
1738-5733
Relacje:
http://www.sciencedirect.com/science/article/pii/S1738573317301882; https://doaj.org/toc/1738-5733
DOI:
10.1016/j.net.2017.04.001
Dostęp URL:
https://doaj.org/article/3d08b71ddad74d9795f79c39785a8d00  Link otwiera się w nowym oknie
Numer akcesji:
edsdoj.3d08b71ddad74d9795f79c39785a8d00
Czasopismo naukowe
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.

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