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Long term radiological effects on plants and animals of a deep geological repository. SR-Site Biosphere

Abstract

This study is part of the safety assessment of the planned repository for spent nuclear fuel in Forsmark, called SR-Site. The purpose of the report is to clarify whether the environment is protected against harmful effects of ionizing radiation after a possible future release of radioactive matter from the planned repository. According to the Swedish Radiation Safety Authority (SSM), biological diversity and sustainable use of biological resources must be protected, and the evaluation should pay special attention to threatened and endemic species as well as economically and culturally valuable species. The report shows the approach to, and results of, calculations of dose rates to organisms other than man. The calculations are based on modelled activity concentrations from a potential future radioactive release, provided by a separate modelling project. Calculations were performed with the ERICA Tool, a software programme developed by an EU research project. In the ERICA Tool, dose rates for site specific organisms (i.e., occurring at the site) were calculated using input data such as size dimensions and masses of organisms, ecosystems and habitats, concentration ratios for the studied elements (i.e. the ratio of accumulated element concentration in the body compared with the element concentration in the surrounding environment)  More>>
Authors:
Torudd, Jesper [1] 
  1. Facilia AB (Sweden)
Publication Date:
Dec 15, 2010
Product Type:
Technical Report
Report Number:
SKB-TR-10-08
Resource Relation:
Other Information: 56 refs., figs., tabs.
Subject:
12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; RADIOACTIVE WASTE DISPOSAL; UNDERGROUND DISPOSAL; RADIATION DOSES; PLANTS; ANIMALS; BIOSPHERE
OSTI ID:
1030182
Research Organizations:
Swedish Nuclear Fuel and Waste Management Co., Stockholm (Sweden)
Country of Origin:
Sweden
Language:
English
Other Identifying Numbers:
Other: ISSN 1404-0344; TRN: SE1108258
Availability:
Also available from: http://www.skb.se/upload/publications/pdf/TR-10-08webb.pdf; OSTI as DE01030182
Submitting Site:
SWDN
Size:
80 pages
Announcement Date:
Dec 02, 2011

Citation Formats

Torudd, Jesper. Long term radiological effects on plants and animals of a deep geological repository. SR-Site Biosphere. Sweden: N. p., 2010. Web.
Torudd, Jesper. Long term radiological effects on plants and animals of a deep geological repository. SR-Site Biosphere. Sweden.
Torudd, Jesper. 2010. "Long term radiological effects on plants and animals of a deep geological repository. SR-Site Biosphere." Sweden.
@misc{etde_1030182,
title = {Long term radiological effects on plants and animals of a deep geological repository. SR-Site Biosphere}
author = {Torudd, Jesper}
abstractNote = {This study is part of the safety assessment of the planned repository for spent nuclear fuel in Forsmark, called SR-Site. The purpose of the report is to clarify whether the environment is protected against harmful effects of ionizing radiation after a possible future release of radioactive matter from the planned repository. According to the Swedish Radiation Safety Authority (SSM), biological diversity and sustainable use of biological resources must be protected, and the evaluation should pay special attention to threatened and endemic species as well as economically and culturally valuable species. The report shows the approach to, and results of, calculations of dose rates to organisms other than man. The calculations are based on modelled activity concentrations from a potential future radioactive release, provided by a separate modelling project. Calculations were performed with the ERICA Tool, a software programme developed by an EU research project. In the ERICA Tool, dose rates for site specific organisms (i.e., occurring at the site) were calculated using input data such as size dimensions and masses of organisms, ecosystems and habitats, concentration ratios for the studied elements (i.e. the ratio of accumulated element concentration in the body compared with the element concentration in the surrounding environment) and maximum activity concentrations of radionuclides from the modelled future release. The results are provided in terms of final dose rates for each studied organism. In accordance with rationales of the International Commission of Radiological Protection (ICRP) and the ERICA project, Representative (site-specific) Organisms from the planned site of the future repository were studied. Ideally, the organisms selected would meet the criteria defined by both SSM (species worth protecting) and by ICRP and ERICA (so-called Reference Organisms). Since activity concentrations for a number of radionuclides were missing for some of the studied organisms, a set of Average Organisms were constructed in order to reduce data gaps, simply by compiling data from related species. Functional key species and economically important species are well represented in the site data. However, red-listed (threatened) species have not been studied, since activity concentrations were, for obvious reasons, unavailable. Instead, dose rates for red-listed species were calculated by using data from similar not red-listed species or Reference Organisms. The data on radionuclide release used in the evaluation emanate from a scenario with canister corrosion and advective conditions, called 'the central corrosion case' in SR-Site. In the ERICA Tool, a screening dose-rate value of 10 muGy h-1 is applied. Calculated dose rates that are below this value are thought to result in a minimal risk of damage to the individual or population through reduced reproduction capacity or increased mortality. In the study, dose rates were calculated for all organisms or organisms groups and none of them exceeded the screening dose-rate value. Calculated dose rates were also below the lowest band of 'derived consideration levels' that has been proposed by ICRP. In addition, background dose rates to organisms were calculated in order to evaluate whether the total dose rates from natural background radiation and the assumed future release combined would yield values above the screening dose rate. Many of the background dose-rate calculations were based on limited data (the activity concentrations were often below the detection limit). All combined dose rates remained below the screening level of 10 muGy h-1. This study gives no reason to assume that any of the species would be harmfully affected by the increased radiation exposure caused by a possible future release from the planned repository for spent nuclear fuel at Forsmark}
place = {Sweden}
year = {2010}
month = {Dec}
}