The annual summer shutdown of the High Flux Reactor in Petten, Netherlands, will begin July 18.
The Nuclear Research and Consultancy Group (NRG) said it plans to perform regular preventative maintenance, testing, and inspection on the unit until August 18. As has been the case for the past three years, NRG will inspect cooling water pipe work as part of the safety check. The inspection will analyze four locations in the pipe work where localized deformations are known and where a small bubble stream was observed in 2008, according to the Petten-based organization.
The High Flux Reactor is one of the key global suppliers of medical isotopes. Hazelwood, MO-based Mallinckrodt, a subsidiary of Covidien of Dublin, Ireland, is a joint venture partner with NRG at Petten. Mallinckrodt provides approximately 40% of the U.S. medical isotope supply.
The temporary July-August closure is just the first of two scheduled shutdowns for Petten. NRG said it plans to take the facility offline in early 2010 for more maintenance work, which is expected to take 22 to 26 weeks to complete.
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Canada wants Chalk River online ASAP, June 19, 2009
Canada cites dangers in abandoned isotope reactors as major reactor remains down, June 16, 2009
Petten nuclear reactor to restart, February 12, 2009
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![Overview of the study design. (A) The fully automated deep learning framework was developed to estimate body composition (BC) (defined as subcutaneous adipose tissue [SAT] in liters; visceral adipose tissue [VAT] in liters; skeletal muscle [SM] in liters; SM fat fraction [SMFF] as a percentage; and intramuscular adipose tissue [IMAT] in deciliters) from MRI. The fully automated framework comprised one model (model 1) to quantify different BC measures (SAT, VAT, SM, SMFF, and IMAT) as three-dimensional (3D) measures from whole-body MRI scans. The second model (model 2) was trained to identify standardized anatomic landmarks along the craniocaudal body axis (z coordinate field), which allowed for subdividing the whole-body measures into different subregions typically examined on clinical routine MRI scans (chest, abdomen, and pelvis). (B) BC was quantified from whole-body MRI in over 66,000 individuals from two large population-based cohort studies, the UK Biobank (UKB) (36,317 individuals) and the German National Cohort (NAKO) (30,291 individuals). Bar graphs show age distribution by sex and cohort. BMI = body mass index. (C) After the performance assessment of the fully automated framework, the change in BC measures, distributions, and profiles across age decades were investigated. Age-, sex-, and height-adjusted body composition reference curves were calculated and made publicly available in a web-based z-score calculator (https://circ-ml.github.io).](https://img.auntminnieeurope.com/mindful/smg/workspaces/default/uploads/2026/05/body-comp.XgAjTfPj1W.jpg?auto=format%2Ccompress&dpr=2&fit=crop&h=167&q=70&w=250)
