The 12th International Conference on Environmental ... - Events

Session 18 Abstracts
5) DISMANTLING THE REACTOR CONTAINMENT OF GERMANY´S FIRST NPP - 16272
Ludger Eickelpasch, NUKEM Technologies GmbH (Germany)
Decommissioning and dismantling of a Nuclear Power Plant (NPP) is a challenging task with very long duration. Coming to
the very end of a dismantling project it is still worth to think about optimization possibilities such as parallel work. Some additional
constrains generated by parallel activities may raise but it can still be effective due to reduction of the overall project schedule
5) USE OF REMOTE EQUIPMENT IN REACTOR DECOMMISSIONING - 16326
Scott Martin, Matt Cole, Scott Adams, S.A.Robotics (USA)
Nuclear reactor decommissioning continues to remain at the forefront of the energy and defence industries as many reactors
built from the 1940s to the 1970s are reaching the end of their life cycles. As demand for decommissioning increases, the focus on
workers health and safety has become paramount. This focus on worker safety, coupled with the unique challenges faced in reactor
decommissioning, continues to promote the use of remote equipment in the decommissioning process. New technologies available
in the market today have also created new opportunities for the implementation and application of remote equipment for reactor
decommissioning. <strong>The</strong>se technologies include: carbon fibre, high pressure liquid cutting, and advanced control packages. Also,
the methods for remote deployment of existing decommissioning technologies such as flame cutting, shearing, and heavy equipment
continue to evolve.
This paper will focus on the use of this technology at the following facilities: the decommissioning of the Rancho Seco reactor
in California, the Brookhaven graphite research reactor in New York, the Windscale Pile 1 Reactor in the United Kingdom, and
the Fort St. Vrain HTG Reactor in Colorado. <strong>The</strong>se have all used remote equipment and emerging technologies to solve complex
problems in nuclear reactor decommissioning.
<strong>The</strong> purpose is this paper is to outline some of the challenges associated with reactor decommissioning, describe new technologies
and deployment techniques being used in the decommissioning field, and to provide an overview of projects using these new
technologies.
7) EXPERIENCE IN CHEMICAL DECONTAMINATION OF PWR SYSTEMS AND COMPONENTS - 16274
Claude Steinkuhler, DDR Consult (Belgium); KoenLenie, Reginald Coomans, Tecnubel (Belgium)
Tecnubel has recently performed various chemical decontamination of French and Belgian Pressurized Water Reactors (PWR)
systems and components. <strong>The</strong> purpose of this paper is to present and compare these experiences. <strong>The</strong> objectives of these operation
were the reduction of the general surface contamination together with the elimination of hot spots in Residual Heat Removal Systems
(RHRS), Chemical and Volume Control Systems (CVCS) and Reactor Coolant Pumps (RCP). This reduction of contamination
leads to the reduction of dosimetry to the maintenance personnel and allows the works on critical equipment. An additional
challenge for three of these projects lay in the execution of a complicated operation on the critical path of a reactor refueling shutdown.
<strong>The</strong> chemical decontamination were performed by circulating an adequate fluid in the systems or around the components.
Since the contamination was generated at hot conditions during power operation, a redox attack on the surface was necessary. <strong>The</strong>
EDF systems and components were decontaminated using a qualified EDF process of the EMMAC family. <strong>The</strong> Reactor Coolant
Pump from the Belgian PWR was treated with the NITROX process, qualified by Westinghouse. <strong>The</strong> functions required by the
decontamination system were very diverse and therefore an existing decontamination loop, which was previous developed for the
decontamination of small circuits, was re-developed and adapted for bigger volumes by DDR Consult and Tecnubel. <strong>The</strong> results of
five decontamination are presented and detailed in terms of efficiency and waste production. <strong>The</strong>se projects were: the chemical
decontamination of the RHRS of Flamanville 1 NPP, of the CVCS non regenerative heat exchanger at St Laurent des Eaux NPP,
of the RHRS and CVCS of Bugey 2 NPP and of two RCP at the Westinghouse Belgian Service Center.
8) ASSESSMENT OF DECOMMISSIONING WASTE FOR KOREAN STANDARD NUCLEAR POWER PLANT - 16126
Jai-Hoon Jung, Han-Jung Na, Jung-Su Park, Byung-Sik Lee,Jong-Hyuck Lee, KOPEC (Korea)
Decommissioning Waste for Korean Standard Nuclear Power Plant (KSNP) was assessed. <strong>The</strong> reference plant is Yonggwang
Unit 1 (YGN1), Westinghouse 950 MWe Pressurized Water Reactor (PWR). YGN1 is located in Yonggwang site, east-south coast
of Korean peninsula, where totally 6 units are in operation. YGN1 started commercial operation in 1986 and is expected to be
decommissioned in the year 2026 after the lifetime of 40 years. YGN1 shares some buildings such as radwaste building with YGN2.
<strong>The</strong>refore, the decommissioning waste from common buildings was redued to half of assessed waste for one unit. According to
Korean regulation, waste is classified into 2 groups; one is high level waste (HLW) and the other is intermediate and low level waste
(ILLW). By engineering judgment, waste disposal criteria are classified into 4 groups; i.e., HLW, ILLW (GTDC: greater than disposal
criteria), ILLW and EW (exempted waste). Waste type is classified by 11 groups; i.e., spent fuel, metal-small, metal-large,
concreted-scabbled, concrete-debris, soil, resin-primary loop decontamination, resin & filter, dry active waste, Asbestos containing
material, and hazard material. In order to reduce waste volume, all wastes should be processed by melting, abrasive blasting, chemical
decontamination, steam reforming, soil assay, incineration, supercompaction, etc.
* This paper will review and present detailed results of assessed waste for KSNP
78