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SPECIAL SECTION PAPERS

Handling and Conditioning Techniques of Activated Swarfs for the Decommissioning of the E. Fermi Nuclear Power Plant

[+] Author and Article Information
Massimo Di Pietro

Department of Civil and Industrial Engineering,
University of Pisa,
Largo Lazzarino 1,
Pisa I-56122, Italy
e-mail: massimodp86@gmail.com

Sergio Pistelli

Trino Nuclear Power Plant,
Sogin SpA,
Strada Statale 31bis del Monferrato,
Trino I-13039, Italy
e-mail: pistelli@sogin.it

Eugenio Garneri

Trino Nuclear Power Plant,
Sogin SpA,
Strada Statale 31bis del Monferrato,
Trino I-13039, Italy
e-mail: garneri@sogin.it

Rosa Lo Frano

Department of Civil and Industrial Engineering,
University of Pisa,
Largo Lazzarino 1,
Pisa I-56122, Italy
e-mail: rosa.lofrano@ing.unipi.it

Riccardo Ciolini

Department of Civil and Industrial Engineering,
University of Pisa,
Largo Lazzarino 1,
Pisa I-56122, Italy
e-mail: r.ciolini@ing.unipi.it

1Corresponding author.

Manuscript received September 30, 2016; final manuscript received October 15, 2017; published online March 5, 2018. Assoc. Editor: Rachid Machrafi.

ASME J of Nuclear Rad Sci 4(2), 020910 (Mar 05, 2018) (5 pages) Paper No: NERS-16-1125; doi: 10.1115/1.4038556 History: Received September 30, 2016; Revised October 15, 2017

In this paper, a new technique to handle solid radioactive materials inside a liquid matrix is presented. The conceptual design of the device profits of the experience and know-how gained in decontamination procedures. The proposed system makes use of an ejector for the suction of a water-highly radioactive swarf mixture from the purifier pool of the Italian E. Fermi nuclear power plant (NPP) and moving it in a suitable container for the subsequent conditioning. A dedicated circuit with an ejector to demonstrate the feasibility of the method was realized. A minimum inlet flow rate was found to have swarf suction. The feasibility of the method was demonstrated, even if it is required to homogenize the inlet mixture to avoid swarf packing conditions inside the ejector.

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References

IAEA, 2001, “ Handling and Processing of Radioactive Waste From Nuclear Application,” International Atomic Energy Agency, Vienna, Austria, Technical Report No. 402. http://www-pub.iaea.org/MTCD/Publications/PDF/TRS402_scr.pdf
IAEA, 2009, “ Classification of Radioactive Waste—General Safety Guide,” International Atomic Energy Agency, Vienna, Austria, Standard No. GSG-1. http://www-pub.iaea.org/MTCD/publications/PDF/Pub1419_web.pdf
Ministero dell'ambiente e della tutela del territorio e del mare (MATTM), 2015, “ Classificazione Dei Rifiuti Radioattivi,” Decree of 7th August 2015 (in Italian).
Sogin SpA, 2011, “ Rapporto Coordinato del Piano Globale di Disattivazione,” Ministero dell'Ambiente e della Tutela del Territorio e del Mare (MATTM), Rome, Italy, Report No. TR-G-0009 (in Italian).
Sogin SpA, 2013,“ Rimozione Componenti Attivati in Piscina, Purificatori e Decontaminazione Vasca,” Ministero dell'Ambiente e della Tutela del Territorio e del Mare (MATTM), Rome, Italy, Report No. TR AT 00019 (in Italian).
Donegà, G. , Giuriato, A. , and Morandi, G. , 1970, “ Elimination of the Thermal Shield from the Trino Vercellese Pressurized Water Reactor by Mechanical Cutting,” Energy Nucl. (Milan), 17(12), pp. 707–720. https://inis.iaea.org/search/search.aspx?orig_q=RN:2008643
Engineering Sciences Data Unit (ESDU), 1985, “ Ejectors and Jet Pumps. Design and Performance for Incompressible Liquid Flow,” IHS ESDU, London, Data Item No. ESDU 85032. https://www.esdu.com/cgi-bin/ps.pl?sess=unlicensed_1171130104939zgt&t=doc&p=esdu_85032a
Green, D. , and Perry, R. , 2007, Perry's Chemical Engineer's Handbook, McGraw-Hill, New York.

Figures

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Fig. 4

Variation of the ejector outlet flow rate versus inlet flow rate with swarf aspiration (the 1 standard deviation error and the linear fit of the experimental data are shown)

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Fig. 3

Layout of the test circuit with the ejector

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Fig. 2

Scheme (on the top) and picture (at the bottom) of the ejector Vimatic®, mod. DN 65 (quotations are in mm). The suction, inlet, and outlet flow are indicated.

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Fig. 1

Thermal shield cutting machine

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Fig. 5

Variation of the swarf outlet mass rate versus total outlet mass rate (the 1 standard deviation error of the outlet swarf mass rate was evaluated by considering the results of different tests in the same conditions)

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