ASATAR

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ASATAR  OBJECTIVES

the project ASATAR aims to collect and analyse selective data of environmentally assisted cracking (EAC), long- term laboratory tests and field cases, for development of a new procedure for assessing the long-term reliability of nuclear components of LWR primary circuits including fuel assemblies. The effort will focus to stress corrosion cracking (SCC), i.e. EAC under constant loading. Respecting that a substantial part of time before SCC damage of components is spent to the crack initiation, the new procedure addresses mainly the crack initiation and will be based on a new idea of matrix of accelerated SCC tests (see Figure 1) and fracture mechanics methodologies for their assessment. ASATAR will analyse suitability of the accelerated tests with high total accelerating factor, the combination of several sub-factors, for prediction of the crack initiation time. Then, results of the analysis will be applied to consolidate and draft a large project – wider experimental program, within the proposed procedure could be verified.

DESCRIPTION OF WORK
Fig.1: Idea of acceleration test matrix. From one component two different test specimens are made (stress factor), different local strain is applied (strain factor), test in two different temperatures (temperature factor) and two water environments (environmental factor).
Fig.1: Idea of acceleration test matrix. From one component two different test specimens are made (stress factor), different local strain is applied (strain factor), test in two different temperatures (temperature factor) and two water environments (environmental factor).

The project is divided into the following work packages (WPs):

  • WP1 ”Multiple acceleration factors”: Analysis of operational and laboratory test data for primary circuit components, acceleration factors of test specimens (CVR, Imperial College, CIEMAT)
  • WP2 “Accelerated cracking of fuel assemblies materials”: Analysis of operational and laboratory test data for fuel assemblies’ behavior and identification of proper acceleration factors and NDT (STUBA, CVR)
  • WP3 Selection of materials, laboratory test methods and NDT (CIEMAT, CVR, STUBA)
  • WP4 Outline of collaborative follow-up project
MAIN RESULTS / HIGHLIGHTS
  • Report on analysis of available lab and field data and identification of gaps and the cracking acceleration factors (consortium only)
  • Report on suitability of SCC accelerated testing for assessing the reliability of components (consortium only)
  • Final public report with outline for building future collaborative project

 DURATION

1 March 2015 – 31 August 2016
18 months

 PARTNERS

CVR / CIEMAT / Imperial College / STUBA 

 CONTACT

Technical Project Leader: Anna Hojna (Centrum Vyzkumu Rez, CVR) anna.hojna@cvrez.cz

 FOR DOWNLOAD

Download factsheet (pdf) 

 

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 europe This project has received funding from the Euratom Seventh Framework Programme under grant agreement No 604965.