The 13th International Conference on Environmental ... - Events

Abstracts
operating plant through decommissioning, the reduction and termination of defunct programs and regulations can help
optimize all facets of decommissioning. This information, learned through trial in previous plants, can be incorporated
into the decommissioning plan of future projects so that the benefits of optimization can be realized from the beginning
of the projects. This process of the collection of information and lessons learned from plant experiences is an important
function of the EPRI Decommissioning Program.
2) 40245 – Status of the Support Researches for the Regulation of Nuclear Facilities Decommissioning in Japan
Yusuke Masuda, Yukihiro Iguchi, Satoru Kawasaki, Masami Kato, JNES (Japan)
In Japan, 4 nuclear power stations are under decommissioning and some nuclear fuel cycle facilities are expected to
be decommissioned in the future. On the other hand, the safety regulation of decommissioning of nuclear facilities was
changed by amending law in 2005. An approval system after review process of decommissioning plan was adopted and
applied to the power stations above. In this situation, based on the experiences of the new regulatory system, the system
should be well established and moreover, it should be improved and enhanced in the future. Nuclear Industry and Safety
Agency (NISA) is in charge of regulation of commercial nuclear facilities in Japan and decommissioning of them is
included. Japan Nuclear Energy Safety Organization (JNES) is in charge of technical supports for NISA as a TSO
(Technical Support Organization) also in this field. As for decommissioning, based on the needs in terms of regulation,
JNES has been continuing research activities from October 2003, when JNES has been established. Considering the
“Prioritized Nuclear Safety Research Plan (August 2009)” of the Nuclear Safety Commission of Japan and the situation
of operators facilities, “Regulatory Support Research Plan between FY 2010-2014” was established in November 2009,
which shows the present regulatory needs and a research program. This program consists of researches for 1. review
process of decommissioning plan of power reactors, 2. review process of decommissioning plan of nuclear fuel cycle
facilities, 3. termination of license at the end of decommissioning and 4. management of decommissioning waste. For the
item 1, JNES studied safety assessment methods of dismantling, e.g. obtaining data and analysis of behavior of dust
diffusion and risk assessment during decommissioning, which are useful findings for the review process. For the item 2,
safety requirements for the decommissioning of nuclear fuel cycle facilities was compiled, which will be used in the
future review. For the item 3, measuring method, release procedure and analysis code for the site release were studied for
the establishment of the license termination process in the future. From FY 2010, based on the new plan, we have started
the researches for the standardization of review process of decommissioning plan for power reactors and nuclear fuel
cycle facilities, establishing the process and criteria of license termination and appropriate method of management of
decommissioning waste based on the waste form confirmation process.
3) 40136 – Decommissioning Costing Approach Based on the Standardised List of Costing Items; Lessons
Learnt
Vladimir Daniska, Frantisek Ondra, Peter Bezak, DECONTA, a.s. (Slovakia);
Ivan Rehak, Marek Vasko, Jozef Pritrsky, DECOM a.s. (Slovakia) ;
Matej Zachar, Vladimir Necas, Slovak University of Technology in Bratislava (Slovakia)
<strong>The</strong> document “A Proposed Standardised List of Items for Costing Purposes” was issues in 1999 by OECD/NEA,
IAEA and European Commission for promoting the harmonisation in decommissioning costing. It is a systematic list of
typical decommissioning activities classified into chapters 01 to 11 with three hierarchical numbered levels. Cost groups
are defined in chapter 12 for presenting cost for each activity. In this way the document is the standardised matrix of
decommissioning activities and cost groups with unambiguous meaning of items. Knowing what is behind the items of
the standardised cost structure makes the comparison of cost for various decommissioning projects transparent. <strong>The</strong>re are
two principal approaches for use of the standardised cost structure. First approach converts the cost items from specific
cost structures into the standardised cost structure for the purpose of cost presentation. Second approach uses the
extended standardised cost structure as the calculation structure; the cost data have the standardised format directly.
Several advantages can be identified in this approach. <strong>The</strong> paper presents general aspects of the costing methodology
based on the standardised cost structure and lessons learnt from last ten years of implementation of the standardised cost
structure as the cost calculation structure in the computer code OMEGA. <strong>The</strong> paper presents following aspects:
• general principles of decommissioning costing in current costing methodologies based on information on costing
methodologies available,
• standardised cost structure, methods of its use in costing, cost calculation structures based on the standardised
cost structure,
• principles of cost calculation methodology based on the standardised cost structure, input data for the
methodology, cost calculation process, management of calculated data
• interactions of main cost structures involved in standardised costing: standardised cost calculation structure,
work breakdown structure of a decommissioning project, relations to cost accounting structures
• main features of the computer code OMEGA: implementation of the standardised cost structure as the cost
calculation structure, management of the material and radioactivity flow in the decommissioning process,
generation of Gantt charts for managing of the decommissioning projects, data feedback from real processes,
links to cost accounting systems
• international activities for promoting of the standardised cost structure and for its upgradin
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