Import of Metal Scrap - Risks Associated with Radioactivity
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KEMAKTA AR 92-22 Import of metal scrap - risks associated with radioactivity Mark Elert KEMAKTA Konsult AB November 1992 KEMAKTA KONSULT AB Box 12655, S-112 93 Stockholm, Sweden Import of metal scrap - risks associated with radioactivity Mark Elert KEMAKTA Konsult AB November 1992 Report prepared for Swedish Radiation Protection Institute (SSI) under contract number P702.92 Abstract There is a growing concern in Sweden for the possibility that imported metal scrap is radioactive. The recent political and economical changes in eastern Europe and the increased cooperation with the CEC has affected Sweden's import. In the last years, the import of metal scrap from the former USSR has increased considerably. In view of recent incidents, when radioactive materials have been found, the Swedish Radiation Protection Institute has detected a need for identifying the potential risk sources and evaluating the magnitude of the risk associated with the import of metal scrap. The purpose of this report is to provide some background material concerning import statistics, use of metal scrap in Sweden and to identify potential sources of radioactive metal scrap. In addition, the radionuclides of most concern has been identified and the possibility of detecting them in metal scrap shipments is analyzed. Ill List of contents 1 INTRODUCTION 1 2 IMPORT AND USE OF SCRAP METAL IN SWEDEN 2 2.1 Import statistics 2 2.2 Metal scrap trade 3 2.3 Iron and steel production 3 2.4 Production of other metals 4 2.5 Foundries 4 3 REGULATIONS IN EXPORTING COUNTRIES 10 4 RISK FOR IMPORT OF RADIOACTIVE SCRAP METAL 13 4.1 General 13 4.2 Situation in the former USSR 14 4.2.1 Russian authorities in the nuclear area 14 4.2.2 Potential sources of radioactive material IS 4.3 Discussion 18 5 RADIONUCLIDES AND DETECTION POSSIBILITIES 19 5.1 Radionuclides in metal scrap 19 5.2 Detection of radioactive metal scrap 22 6 SUMMARY AND CONCLUSIONS 25 REFERENCES 26 INTRODUCTION Background Presently large changes are occurring in the world trade that affects Sweden'* impon and export. The reasons for these changes are the removal of internal borders within the European Community and the economical and political changes in eastern Europe. Still larger changes can come after the signing of the agreement on the European Economic Area (EEA) between the CEC and the EFTA countries. These changes have lead to an increase in the import of a number of products to Sweden. Particularly large is the increase in the import from the countries in eastern Europe. In the summer of 1992 a shipment of copper plates with radioactivity was detected in the port of Stockholm. The activity concentration in the shipment was low and it did not give rise to any risk to persons involved with the shipment or to the public. However, this incident together with reports of similar incidents from other sources has lead to some concern at the Swedish authorities. If large amounts of low activity scrap metal are imported into Sweden and remelted for the production of new metal, the general level of activity in metals will increase and thus give rise to an increased societal risk in the form of cancer. An increased activity level may also be caused by small amounts of high activity material that is imported and melted. In addition, high activity material may give rise to an immediate risk to persons coming in direct contact with the material, e.g. truck drivers, customs officers, scrap handlers, and steel mill workers. The Swedish Radiation Protection Institute has detected a need for identifying the potential risk sources and evaluating the magnitude of the risk associated with impon of scrap metal. Purpose and scope This repon intends to give background material for the Swedish Radiation Protection Institute concerning the risk connected to the impon of scrap metal that may contain radioactive material. The repon also treats the risk connected to forgotten, misplaced or stolen radiation sources. Statistics from the last years concerning metal scrap impon are analyzed and the main users of metal scrap are identified. Steel mills, melting plants and scrap dealers have been inquired of their current practicies for scrap impon and monitoring of radioactivity. Furthermore, a study has been made of potential sources of radioactive steel scrap with the focus on the countries of the former USSR. Russian authorities in the area of radiation protection have been contacted with help from the Swedish Technical Attache in Moscow. The radionuclides of most concern have been identified and the possibility of detecting these radionuclides in metal scrap shipments is analyzed. IMPORT AND USE OF SCRAP METAL IN SWEDEN 2.1 Import statistics The Swedish custom collects statistical information of imports and exports based on the shipping records. This information is compiled in a database by the Official Swedish Statistics of Sweden, SCB. From this database, excerpts can be obtained concerning amounts, values and origin countries for various intervals. For this project an excerpt was made for metal scrap imports during the years 1990.1991 and the first half 1992. The type of goods is identified by a category number. Statistics for 24 different metals could be obtained from the SCB database. The division into categories is relatively fine, but depends on how common a certain type of goods is. For example iron and steel scrap is divided into ten subcategories. while for less common metais, raw material, scrap, and powder may be combined into one category. It is therefore not possibie to obtain a complete statistics for metal scrap. The selected categories for metal scrap are given in Table 2.1. Tables 2.2-2.4 give the import for 1990, 1991 and first half of 1992 in tonnes. The imported quantity is given for total import, and from different parts of the world. In the data for 1990 and 1991, the sum for the different parts of the world does not always add up to the given total. The reason for this is that the origin country is not specified when the total import of a certain category is less than 300000 SEK. There are large fluctuations in the imported amounts among the three periods, depending on demand from Swedish industry, prices, statistical fluctuations, etc. However, in this period a noticeable increase can be seen in the import of scrap metal from the former USSR, especially concerning imports of copper, nickel, aluminum, molybdenum, magnesium, cobalt, titanium, and manganese, see Figure 2.1. During the first half of 1992 more than 40% of the total import of copper (5700 tonnes of 13100 tonnes) came from the former USSR. The scrap metal import to Sweden may change in the future. For example it is very sensitive to changes in the economy. In 1985,700 000 tonnes of iron and steel scrap were imported while the import in 1991 was 165 000 tonnes. With the signing of the EEA- treaty, the previous ban on expon of iron and steel scrap from Sweden will be removed. It is expected that this will lead to an export of metal scrap from southern Sweden to Germany, and an increased import of scrap metal to the steel mills in Northern Sweden. A large part of this import is likely to come from the east. The statistical material is associated with some uncertainty. Since the statistics are based on information in the shipping documents many error sources may be present. The importer may willfully or unknowingly declare false information concerning type of goods, amount, or place of origin. Since there is no customs fee on scrap metal it is unlikely that it should be declared as an other type of goods willingly. However, the Swedish customs have experienced several occurrences when the value of the cargo has been falsely declared, e.g. by giving a lower weight. It may therefore be possible that scrap of more valuable metals can have been declared as metals of lower value. It is also possible that erroneous information is given concerning the country of origin. 2.2 Metal scrap trade The major Swedish steel mills import iron scrap through a jointly owned company, see below. Steel manufactures may import alloyed scrap metal themselves 01 turn to other metal scrap traders. The import of copper, brass and aluminum goes mainly through metal scrap traders. There are a large number of small and medium size metal scrap traders in Sweden, most of them dealing with domestic scrap. The import of metal scrap is to a large extent handled by a few major scrap traders with established connections in the countries they import from. The metal scrap is transported on boat, rail or trucks in containers or platforms each with a load of roughly 20 tonnes. Usually certificates verifying the quality of the scrap metal are required. The major scrap traders have become aware of the potential risk of receiving radioactive scrap metal and some traders have started to measure radiation on imported metal scrap. The recent changes in eastern Europe have lead to increased commercial connections. These countries have a lack of hard currency and thereby scrap metal may become pan of a payment. Thus, many traders normally dealing with other types of goods get involved in metal scrap trading. These traders may lack the necessary competence in evaluating the quality of the metal scrap, which increases the risk of importing "unwanted" metal scrap to Sweden. The traders sell the metal scrap to larger scrap dealers or to the manufacturers directly. The contacted purchasing managers at major Swedish steel and metal melters we have reached, claim they are contacted several times a week by this type of traders.