The 12th International Conference on Environmental ... - Events
The 12th International Conference on Environmental ... - Events
The 12th International Conference on Environmental ... - Events
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
Sessi<strong>on</strong> 18 Abstracts<br />
5) DISMANTLING THE REACTOR CONTAINMENT OF GERMANY´S FIRST NPP - 16272<br />
Ludger Eickelpasch, NUKEM Technologies GmbH (Germany)<br />
Decommissi<strong>on</strong>ing and dismantling of a Nuclear Power Plant (NPP) is a challenging task with very l<strong>on</strong>g durati<strong>on</strong>. Coming to<br />
the very end of a dismantling project it is still worth to think about optimizati<strong>on</strong> possibilities such as parallel work. Some additi<strong>on</strong>al<br />
c<strong>on</strong>strains generated by parallel activities may raise but it can still be effective due to reducti<strong>on</strong> of the overall project schedule<br />
5) USE OF REMOTE EQUIPMENT IN REACTOR DECOMMISSIONING - 16326<br />
Scott Martin, Matt Cole, Scott Adams, S.A.Robotics (USA)<br />
Nuclear reactor decommissi<strong>on</strong>ing c<strong>on</strong>tinues to remain at the forefr<strong>on</strong>t of the energy and defence industries as many reactors<br />
built from the 1940s to the 1970s are reaching the end of their life cycles. As demand for decommissi<strong>on</strong>ing increases, the focus <strong>on</strong><br />
workers health and safety has become paramount. This focus <strong>on</strong> worker safety, coupled with the unique challenges faced in reactor<br />
decommissi<strong>on</strong>ing, c<strong>on</strong>tinues to promote the use of remote equipment in the decommissi<strong>on</strong>ing process. New technologies available<br />
in the market today have also created new opportunities for the implementati<strong>on</strong> and applicati<strong>on</strong> of remote equipment for reactor<br />
decommissi<strong>on</strong>ing. <str<strong>on</strong>g>The</str<strong>on</strong>g>se technologies include: carb<strong>on</strong> fibre, high pressure liquid cutting, and advanced c<strong>on</strong>trol packages. Also,<br />
the methods for remote deployment of existing decommissi<strong>on</strong>ing technologies such as flame cutting, shearing, and heavy equipment<br />
c<strong>on</strong>tinue to evolve.<br />
This paper will focus <strong>on</strong> the use of this technology at the following facilities: the decommissi<strong>on</strong>ing of the Rancho Seco reactor<br />
in California, the Brookhaven graphite research reactor in New York, the Windscale Pile 1 Reactor in the United Kingdom, and<br />
the Fort St. Vrain HTG Reactor in Colorado. <str<strong>on</strong>g>The</str<strong>on</strong>g>se have all used remote equipment and emerging technologies to solve complex<br />
problems in nuclear reactor decommissi<strong>on</strong>ing.<br />
<str<strong>on</strong>g>The</str<strong>on</strong>g> purpose is this paper is to outline some of the challenges associated with reactor decommissi<strong>on</strong>ing, describe new technologies<br />
and deployment techniques being used in the decommissi<strong>on</strong>ing field, and to provide an overview of projects using these new<br />
technologies.<br />
7) EXPERIENCE IN CHEMICAL DECONTAMINATION OF PWR SYSTEMS AND COMPONENTS - 16274<br />
Claude Steinkuhler, DDR C<strong>on</strong>sult (Belgium); KoenLenie, Reginald Coomans, Tecnubel (Belgium)<br />
Tecnubel has recently performed various chemical dec<strong>on</strong>taminati<strong>on</strong> of French and Belgian Pressurized Water Reactors (PWR)<br />
systems and comp<strong>on</strong>ents. <str<strong>on</strong>g>The</str<strong>on</strong>g> purpose of this paper is to present and compare these experiences. <str<strong>on</strong>g>The</str<strong>on</strong>g> objectives of these operati<strong>on</strong><br />
were the reducti<strong>on</strong> of the general surface c<strong>on</strong>taminati<strong>on</strong> together with the eliminati<strong>on</strong> of hot spots in Residual Heat Removal Systems<br />
(RHRS), Chemical and Volume C<strong>on</strong>trol Systems (CVCS) and Reactor Coolant Pumps (RCP). This reducti<strong>on</strong> of c<strong>on</strong>taminati<strong>on</strong><br />
leads to the reducti<strong>on</strong> of dosimetry to the maintenance pers<strong>on</strong>nel and allows the works <strong>on</strong> critical equipment. An additi<strong>on</strong>al<br />
challenge for three of these projects lay in the executi<strong>on</strong> of a complicated operati<strong>on</strong> <strong>on</strong> the critical path of a reactor refueling shutdown.<br />
<str<strong>on</strong>g>The</str<strong>on</strong>g> chemical dec<strong>on</strong>taminati<strong>on</strong> were performed by circulating an adequate fluid in the systems or around the comp<strong>on</strong>ents.<br />
Since the c<strong>on</strong>taminati<strong>on</strong> was generated at hot c<strong>on</strong>diti<strong>on</strong>s during power operati<strong>on</strong>, a redox attack <strong>on</strong> the surface was necessary. <str<strong>on</strong>g>The</str<strong>on</strong>g><br />
EDF systems and comp<strong>on</strong>ents were dec<strong>on</strong>taminated using a qualified EDF process of the EMMAC family. <str<strong>on</strong>g>The</str<strong>on</strong>g> Reactor Coolant<br />
Pump from the Belgian PWR was treated with the NITROX process, qualified by Westinghouse. <str<strong>on</strong>g>The</str<strong>on</strong>g> functi<strong>on</strong>s required by the<br />
dec<strong>on</strong>taminati<strong>on</strong> system were very diverse and therefore an existing dec<strong>on</strong>taminati<strong>on</strong> loop, which was previous developed for the<br />
dec<strong>on</strong>taminati<strong>on</strong> of small circuits, was re-developed and adapted for bigger volumes by DDR C<strong>on</strong>sult and Tecnubel. <str<strong>on</strong>g>The</str<strong>on</strong>g> results of<br />
five dec<strong>on</strong>taminati<strong>on</strong> are presented and detailed in terms of efficiency and waste producti<strong>on</strong>. <str<strong>on</strong>g>The</str<strong>on</strong>g>se projects were: the chemical<br />
dec<strong>on</strong>taminati<strong>on</strong> of the RHRS of Flamanville 1 NPP, of the CVCS n<strong>on</strong> regenerative heat exchanger at St Laurent des Eaux NPP,<br />
of the RHRS and CVCS of Bugey 2 NPP and of two RCP at the Westinghouse Belgian Service Center.<br />
8) ASSESSMENT OF DECOMMISSIONING WASTE FOR KOREAN STANDARD NUCLEAR POWER PLANT - 16126<br />
Jai-Ho<strong>on</strong> Jung, Han-Jung Na, Jung-Su Park, Byung-Sik Lee,J<strong>on</strong>g-Hyuck Lee, KOPEC (Korea)<br />
Decommissi<strong>on</strong>ing Waste for Korean Standard Nuclear Power Plant (KSNP) was assessed. <str<strong>on</strong>g>The</str<strong>on</strong>g> reference plant is Y<strong>on</strong>ggwang<br />
Unit 1 (YGN1), Westinghouse 950 MWe Pressurized Water Reactor (PWR). YGN1 is located in Y<strong>on</strong>ggwang site, east-south coast<br />
of Korean peninsula, where totally 6 units are in operati<strong>on</strong>. YGN1 started commercial operati<strong>on</strong> in 1986 and is expected to be<br />
decommissi<strong>on</strong>ed in the year 2026 after the lifetime of 40 years. YGN1 shares some buildings such as radwaste building with YGN2.<br />
<str<strong>on</strong>g>The</str<strong>on</strong>g>refore, the decommissi<strong>on</strong>ing waste from comm<strong>on</strong> buildings was redued to half of assessed waste for <strong>on</strong>e unit. According to<br />
Korean regulati<strong>on</strong>, waste is classified into 2 groups; <strong>on</strong>e is high level waste (HLW) and the other is intermediate and low level waste<br />
(ILLW). By engineering judgment, waste disposal criteria are classified into 4 groups; i.e., HLW, ILLW (GTDC: greater than disposal<br />
criteria), ILLW and EW (exempted waste). Waste type is classified by 11 groups; i.e., spent fuel, metal-small, metal-large,<br />
c<strong>on</strong>creted-scabbled, c<strong>on</strong>crete-debris, soil, resin-primary loop dec<strong>on</strong>taminati<strong>on</strong>, resin & filter, dry active waste, Asbestos c<strong>on</strong>taining<br />
material, and hazard material. In order to reduce waste volume, all wastes should be processed by melting, abrasive blasting, chemical<br />
dec<strong>on</strong>taminati<strong>on</strong>, steam reforming, soil assay, incinerati<strong>on</strong>, supercompacti<strong>on</strong>, etc.<br />
* This paper will review and present detailed results of assessed waste for KSNP<br />
78