A pilot free-release monitoring post with a 600 L container monitor was developed and metrological tested within the 2nd stage of NPP A1 decommissioning project. In order to reduce the volume of contaminated soil monitoring a conceptual design of fast sorting loader shovel monitor (loader’s spoon) was proposed and tested within the project as well. The free-release monitoring post makes use of a pair of electrically cooled lead shielded semiconductor detectors placed into a mounting rack ensuring measurements in either horizontal (container monitoring) or vertical (drum monitoring) counting geometry. For evaluation of measured HPGe spectra the Canberra – Packard ISOCS detection efficiency calculation code was used. A loader is used to change the measured side of the 600 L container. For metrological certification of this monitor a special prototype test container with 24 rod sources inside a regular grid was necessary to design and to use. The mentioned above vertical counting geometry together with an additional drum rotator ensures standard free release monitoring of materials in 200 l rotating drums. Successful metrological qualification of the both counting geometries at SMU Bratislava showed 20% accuracy class. A pair of NaI(Tl) detectors and a measurement and navigation frame ensuring loader shovel fixation in counting position are used for the fast sorting monitoring. The navigation of loader and its shovel to the counting geometry should be as fast as possible. The monitored results shall be indicated by a prompt light indication system (apart from storing on HDD). MCNP 5 calculation code was used for assessment of gross gamma 137Cs detection efficiency. The estimated MDA for a pair of 2″ × 2″ Na(Tl) detectors and 30 s acquisition time is about 90 Bq/kg. However, due to the counting geometry deviations from calculated values the uncertainty of measurements can be relatively high. Hence, the system is applicable for sorting monitoring only.
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ASME 2011 14th International Conference on Environmental Remediation and Radioactive Waste Management
September 25–29, 2011
Reims, France
Conference Sponsors:
- Nuclear Engineering Division and Environmental Engineering Division
ISBN:
978-0-7918-5498-3
PROCEEDINGS PAPER
New Free-Release and Sorting Monitors Developed for NPP A-1 Decommissioning, Slovakia
Ondrej Sla´vik,
Ondrej Sla´vik
VUJE, a.s., Trnava, Slovakia
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Alojz Slaninka,
Alojz Slaninka
VUJE, a.s., Trnava; Slovak University of Technology in Bratislava, Bratislava, Slovakia
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Martin Lisˇtjak,
Martin Lisˇtjak
VUJE, a.s., Trnava, Slovakia
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Kamil Krava´rik,
Kamil Krava´rik
VUJE, a.s., Trnava, Slovakia
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Igor Pe´ly
Igor Pe´ly
JAVYS, a.s., Bratislava, Slovakia
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Ondrej Sla´vik
VUJE, a.s., Trnava, Slovakia
Alojz Slaninka
VUJE, a.s., Trnava; Slovak University of Technology in Bratislava, Bratislava, Slovakia
Martin Lisˇtjak
VUJE, a.s., Trnava, Slovakia
Kamil Krava´rik
VUJE, a.s., Trnava, Slovakia
Igor Pe´ly
JAVYS, a.s., Bratislava, Slovakia
Paper No:
ICEM2011-59071, pp. 793-799; 7 pages
Published Online:
August 17, 2012
Citation
Sla´vik, O, Slaninka, A, Lisˇtjak, M, Krava´rik, K, & Pe´ly, I. "New Free-Release and Sorting Monitors Developed for NPP A-1 Decommissioning, Slovakia." Proceedings of the ASME 2011 14th International Conference on Environmental Remediation and Radioactive Waste Management. ASME 2011 14th International Conference on Environmental Remediation and Radioactive Waste Management, Parts A and B. Reims, France. September 25–29, 2011. pp. 793-799. ASME. https://doi.org/10.1115/ICEM2011-59071
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