Feasibility Study for Siting of a Deep Repository Within the Mala Municipality
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SE9800008 TECHNICAL REPORT 96-22 Feasibility study for siting of a deep repository within the Mala municipality Swedish Nuclear Fuel and Waste Management Co March 1996 SVENSK KARNBRANSLEHANTERING AB SWEDISH NUCLEAR FUEL AND WASTE MANAGEMENT CO P.O.BOX 5864 S-102 40 STOCKHOLM SWEDEN PHONE +46 8 665 28 00 FAX+46 8 661 57 19 FEASIBILITY STUDY FOR SITING OF A DEEP REPOSITORY WITHIN THE MALA MUNICIPALITY March 1996 -08 Key words: Deep repository, site selection, feasibility study, Mala FOREWORD This report presents the results of the feasibility study in Mala, summarizing a broad investigative effort undertaken to shed light on the prospects for siting a deep repository in the municipality of Mala, and what consequences this would have for the individual, the community and the environment. SKB's overall evaluation is that the municipality of Mala could provide good pros- pects for a deep repository. We would like to mention two factors in particular as arguments in support of this conclusion; the bedrock and the local mining tradition. The bedrock is decisive in determining the feasibility of achieving safe disposal, and there are large areas in Mala Municipality where we judge the bedrock conditions to be good. We cannot determine, however, whether a particular site is definitely suitable from the feasibility study - that will require direct investigations on the site. The mining industry, with all its peripheral activities, has through the years made Mala a centre of knowledge on geoscience and underground rock excavation. We are familiar with the value of this knowledge because specialists from Mala - geologists, geophysicists, diamond drillers and others - have participated in SKB's development activities since the start in the 1970s. When the deep repository is to be built and put into operation, much of the work will be related to the rock. Examples range from scientific investigations to tunnelling work and transportation. It is obvious that the expertise that exists in Mala within these areas would be of great advantage. Will the deep repository be sited in Mala? We cannot answer that today, either for Mala or any other place in Sweden. What we do know is that we have nuclear fuel that has to be permanently disposed of, and that this must be done at a suitable site in Sweden. The process leading up to a final decision is a long one. In Mala's case, the results of this preliminary study must first be compared with data from feasibility studies at other locations. Then, a coordinated evaluation will be made of all candidate sites and areas with respect to the siting factors and criteria which SKB has outlined to the regulatory authorities and the Government. The intention is to find at least two areas in the country where siting studies for the deep repository can proceed with so-called site-specific investigations, entailing detailed characterization of the bedrock on a particular site. Only when the results of these investigations have been evaluated will we have the data needed to propose a site for the deep repository. Good safety-related and technical conditions are basic requirements for considering a site for more detailed siting studies. But other factors are also important. The deep repository will affect the local community and the region in different ways. The issue is controversial and opinions differ as to whether a deep repository would be of benefit to the community or not. SKB's ambition is that the deep repository project should contribute to positive socioeconomic development, but the support of both the regional community and society as a whole is needed. An important principle in our planning of the deep repository is that it should be con- structed in a step-by-step fashion. The intention is to construct the repository first for a small volume of spent fuel, proceeding only after a thorough evaluation. This will enable new findings to be taken into consideration, for example new technology or options for reuse. Thanks to the fact that we have built an interim storage facility, NEXT PAGE(S) left BLANK those who will then have responsibility for making the decisions will even be able to retrieve the fuel and return it to interim storage, if this should be deemed desirable for any reason. Our main alternative is, however, that the deep repository will be con- structed to its full extent, since we are convinced that deep disposal will be found to be the right option in the future as well, and that the method satisfies the stringent requirements that must be made. Mala Municipality has initiated an independent review of the feasibility study. It is our hope that this process will also provide an opportunity to shed light on questions that could not be dealt with in this report. Viewed from a local perspective, the deep repository issue can involve numerous additional aspects beyond the technical and environmental criteria that form the basis of both our judgements and those of the regulatory authorities. SKB will continue to maintain a presence in Mala. We are naturally prepared to assist with further information, additional data or clarifications. Many people have participated in the feasibility study and contributed to its results - from SKB, the municipality, universities and consulting firms, government authorities, the county administrative board, and various interest groups. To all of those who have been involved in different capacities and from different vantage points, we would like to express our sincere gratitude. Stockholm, March 1996 SWEDISH NUCLEAR FUEL AND WASTE MANAGEMENT CO <^\r^~~ Sten Bjurstrom President NEXT PAGE(S) left BLANK ABBREVIATIONS Svensk Karnbranslehantering AB (The Swedish Nuclear Fuel and Waste Management Company), SKB, is responsible for the management and disposal of Sweden's radio- active waste. The primary category is waste from the nuclear power plants, but some waste also comes from hospitals, industry and research institutions. The power utilities that produce nuclear power have jointly formed SKB. Every three years SKB reports to the authorities regarding the state of knowledge in the nuclear waste programme, ongoing work and planning. The accounts submitted in 1986 and 1989 are referred to as the R&D-Programme 86 and R&D-Programme 89 (R&D = Research & Development), respectively. The equivalent reports from 1992 and 1995 are referred to as the RD&D-Programme 92 and RD&D-Programme 95 (RD&D = Research, Development & Demonstration). The programmes are reviewed by the regulatory authorities and undergo extensive circulation for review and com- mentary. This work serves as a basis for decisions and guidelines issued by the Government for the waste programme. The Swedish Nuclear Power Inspectorate, SKI, and the Swedish Radiation Protection Institute, SSI, are the state regulatory authorities who scrutinize activities and oversee safety for both nuclear power plant operation and waste management. SKI is also the authority who administers the surcharges on the production of nuclear-generated elec- tricity which are set aside in reserve funds to pay for the disposal of the nuclear waste. The Swedish National Council for Nuclear Waste, KASAM, is an advisory scientific body tied to the Ministry of Environment which has to present its independent assess- ment of the state of knowledge in the nuclear waste field every three years. CLAB (Central Interim Storage Facility for Spent Nuclear Fuel) is an underground rock facility situated at the Oskarshamn Nuclear Power Station. Spent nuclear fuel from the nuclear power plants is taken to CLAB for interim storage for 3CM-0 years. During this time the radioactivity and heat output of the fuel declines by 90%, which simplifies subsequent handling in encapsulation, transport and deposition. Storage and handling at CLAB takes place under water. SFR (Final Repository for Radioactive Operational Waste) is located under the sea off the coast of the Forsmark Nuclear Power Station. All the low- and intermediate- level short-lived waste from nuclear power plant operation is disposed of in SFR. Like CLAB, SFR began operation during the 1980s. The Aspo Hard Rock Laboratory or HRL is an underground laboratory situated in the vicinity of the Oskarshamn Nuclear Power Station and extends down to a depth of about 450 metres. Different methods for bedrock investigation, as well as technology for deposition and disposal, are tested at the Aspo HRL. MSXT PAGE(S) left BLANK Vll SUMMARY It is SKB's task to gather the data that is needed to site - i.e. to select the general local- ity and specific location of - a deep repository for Sweden's spent nuclear fuel and other long-lived radioactive waste. The feasibility study in Mala is one of the many components in this work. A deep repository differs from other industrial and underground facilities in one essen- tial respect; the deep repository is intended for the handling and storage of material with a high concentration of radioactive substances. This is the main reason why a facility and its siting is so controversial. It also gives rise to special requirements on how the siting work is to be carried out and on the site that is selected. A number of factors must be considered. The most important criterion is that the safety require- ments can be satisfied on the site where the deep repository is built. Other siting fac- tors depend on technical conditions, land and the environment, plus a broad spectrum of societal aspects. Background material concerning siting factors is compiled in general siting studies of all or parts of the country. Feasibility studies examine the siting prospects in poten- tially suitable and interested municipalities. SKB plans to carry out feasibility studies in five to ten municipalities in different parts of the country. Besides in Mala, feasibil- ity studies are currently being conducted in the municipalities of Osthammar and Nykoping.