Detection of hydrogen distribution in E110 VVER fuel claddings at LVR15 research reactor by neutron radiography technique

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F26722445%3A_____%2F18%3AN0000136" target="_blank" >RIV/26722445:_____/18:N0000136 - isvavai.cz</a>

Result on the web

—

DOI - Digital Object Identifier

—

Result language

angličtina

Original language name

Detection of hydrogen distribution in E110 VVER fuel claddings at LVR15 research reactor by neutron radiography technique

Original language description

Zirconium based nuclear fuel claddings act as a barrier against the loss of fuel particles in the coolant water during plant operation, handling and dry storage of spent fuel rods. Claddings absorbs hydrogen produced during reactor operation due to aggressive corrosion. An increase in the hydrogen concentration limit can lead to hydride precipitation, resulting in a reduction in cladding strength and / or mechanical failure by a process called Delayed Hydride Cracking (DHC). Damage mechanism is related and dependent on the hydrogen concentration limits in the cladding. Therefore, the distribution and quantification of hydrogen and zirconium based fuel claddings is an object of intensive research. The high sensitivity of neutrons for hydrogen and as a non-destructive method, Un-irradiated Zirconium based fuel clads (Zr-1% Nb) have been investigated at the neutron radiography facility of the LVR-15 research reactor in Rez, Czech Republic. The samples were investigated in a horizontal channel that offers an intense thermal neutron beam with a diameter of 10 cm. The facility is equipped with the latest Timepix based detectors, with thin 6LiF converters for neutron detection capable of delivering high resolution. 2D radiography results have been obtained from 3 fuel cladding sections that differ in their hydrogen content. Qualitative information on hydrogen concentration locations in fuel cladding were identified. The H-distribution was revealed by image processing based on intensity histograms.Based on the neutron radiography results, a quantitative evaluation of hydrides distribution was performed by the classical metallographic procedure and electron microscopy. Qualitative and quantitative inspection of hydrogen distribution in fuel claddings is reported in this paper. Presented at Sixth International Conference on Radiation and Applications in Various Fields of Research Jun 18-22, 2018, Ohrid, Macedonia.

Czech name

—

Czech description

—

Type

O - Miscellaneous

CEP classification

—

OECD FORD branch

20305 - Nuclear related engineering; (nuclear physics to be 1.3);

Project

<a href="/en/project/LQ1603" target="_blank" >LQ1603: Research for SUSEN</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů