Bewertung der Endlagermöglichkeiten in der Grube Konrad auf der Grundlage von Experimenten zur Handhabung und Isolierung von radioaktiven Abfällen
220 pages
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Bewertung der Endlagermöglichkeiten in der Grube Konrad auf der Grundlage von Experimenten zur Handhabung und Isolierung von radioaktiven Abfällen

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220 pages
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Kommission der Europäischen Gemeinschaften kernforschung und -technologie Bewertung der Endlagermöglichkeiten in der Grube Konrad auf der Grundlage von Experimenten zur Handhabung und Isolierung von radioaktiven Abfällen ^ Λ ^^ ^^V X* Bericht EUR 9071 DE­EN Kommission der Europäischen Gemeinschaften ■:: Vi {;. ' ~y''i Bewertung der Endlagermöglichkeiten in der Grube Konrad auf der Grundlage von Experimenten zur Handhabung und Isolierung von radioaktiven Abfällen Jahresbericht zum Vertrag Nr. WAS­145­80 D (B) ¡m Rahmen des indirekten Aktionsprogramms der Europäischen Gemeinschaft für die Jahre 1980­1981 einschließlich Verlängerungszeitraum 1982 Bewirtschaftung und Lagerung von radioaktiven Abfällen Aktion Nr.

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Nombre de lectures 10
Langue Deutsch
Poids de l'ouvrage 6 Mo

Extrait

Kommission der Europäischen Gemeinschaften
kernforschung und
-technologie
Bewertung der Endlagermöglichkeiten in der
Grube Konrad auf der Grundlage
von Experimenten zur Handhabung und
Isolierung von radioaktiven Abfällen
^ Λ
^^
^^V X*
Bericht
EUR 9071 DE­EN Kommission der Europäischen Gemeinschaften
■::
Vi {;. ' ~y''i
Bewertung der Endlagermöglichkeiten in der
Grube Konrad auf der Grundlage
von Experimenten zur Handhabung und
Isolierung von radioaktiven Abfällen
Jahresbericht
zum Vertrag Nr. WAS­145­80 D (B) ¡m Rahmen des
indirekten Aktionsprogramms der Europäischen
Gemeinschaft für die Jahre 1980­1981 einschließlich
Verlängerungszeitraum 1982
Bewirtschaftung und Lagerung von radioaktiven
Abfällen
Aktion Nr. 7: Lagerung in geologischen Formationen
Generaldirektion
Wissenschaft, Forschung und Entwicklung
1984 EUR 9071 DE­EN Veröffentlicht durch
KOMMISSION DER EUROPÄISCHEN GEMEINSCHAFTEN
Generaldirektion
Informationsmarkt und Innovation
Bâtiment Jean Monnet
LUXEMBOURG
HINWEIS
Weder die Kommission der Europäischen Gemeinschaften noch Personen,
die im Namen dieser Kommission handeln, sind für die etwaige Verwendung
der nachstehenden Informationen verantwortlich
Bibliographische Daten befinden sich am Ende der Veröffentlichung
Luxemburg: Amt für amtliche Veröffentlichungen der Europäischen Gemeinschaften, 1984
ISBN 92­825­4326­9 Katalognummer:
© EGKS­EWG­EAG, Brüssel ■ Luxemburg,1984
Printed in Belgium General Remarks
The feasibility study of the disused iron-ore mine Konrad for the final
disposal of LLW and decommissioning waste from nuclear power stations ter­
minated in 1982 with the compilation of the Final Report which contains
all scientific and technical results of the research project as achieved
during the more than five years term. It was possible to prove both the
suitability of the mine for the final disposal of these radioactive waste
products and the safety of the disposal operations. The technical conceptions
developed within the frame of the project are to be considered as important
aids in the construction, operation and decommissioning of the waste repo­
sitory. For the purpose of intensified public relations an abridged version
of the final report was published, which was distributed regionally and
supra-regionally.
A working group consisting of the Gesellschaft für Strahlen- und Umweltfor­
schung mbH (GSF), the Bundesanstalt für Geowissenschaften und Rohstoffe
(BGR), the Physikalisch-Technische Bundesanstalt (PTB), and the Deutsche
Gesellschaft zum Bau und Betrieb von Endlagern (DBE) compiled on the basis
of the final report a first planning document (draft) for the waste reposi­
tory Konrad. By means of this document the PTB started an application for
licensing with the licensing authority of Lower Saxony on August 31st, 1982.
In 1982 meteorological and geoscientific long-term measurements were con­
tinued parallel to the investigation results reported on. As regards par­
ticular questions on safety aspects of waste repositories and radiation
protection further investigations, partly in cooperation with universities
and industrial firms were additionally carried out. With respect to the
licensing procedure site specific data, such as population statistics in
the area around the mine, traffic ways, industrial works and agricultural
lands in the vicinity as well as the near-surface hydrogeological conditions
were specially determined. For the purpose of futur basic geoscientific re­
search in the Konrad mine an extensive R+D-programme was developed with
which a. o. questions of radionuclide migration and radionuclide retention
at final disposal of radioactive wastes in partly fractured solid rocks is
to be investigated. The in-situ tests are to be carried out in the Konrad IV
mine during the years 1983 ­ 1985 on the commission of the Bundesminister
für Forschung und Technologie (BMFT) as a specially subsidized project.
Petrographical and Geochemical Investigations
In continuation of sorption experiments laboratory investigations were per­
formed to determine the transport of radionuclides in practically impermeable
_g
clay­stones (permeability coefficient < 10 m/s) by diffusion. The selectively
chosen rock­samples belong to the formations Alb, Barrerne, Hauterive, Port­
land, Kimmeridge and Dogger. By the further development of preparatory tech­
niques for the production of suitable testing specimen it was possible to de­
velop laboratory conditions which correspond largely to the in­situ conditions.
The specimen were compressed with 10 kp/cm2. According to this compression the
rock density ranged between 2,1 and 2,2 g/cm3 and the free water content be­
tween 10 and 15 wt% (Original rock density: 2,2 to 2,35 g/cm3, H20: 5 to 11
wt%). The diffusion constants were determinated for strontium, iodine, cesium,
and water. The constants determined ranged for water marked with tritium be­
tween 3,5 and 6,5 χ 10 3 cm2/s, for iodine between 2,0 and 3,5 χ 10 cm2/s,
for strontium between 0,4 and 1,5 χ 10 cm2/s and for cesium between 0,5 and
_o
1,1 χ 10 cm2/s. The distinctly lower diffusion constants for the elements
strontium and cesium, in comparison with water, indicate a sorption behaviour
of the rocks, which is specific for the elements investigated.
Hydrogeological and Hydrochemical Investigations
In the scope of the hydrological field investigations the ground­water tem­
peratures and the electrical conductivity in quarternary aquifers were measu­
red in 49 observation tubes and wells within a radius of 5,5 km around the
Konrad mine. As heat producer for the near­surface groundwater it was possible
to localize shaft Konrad 2 besides facilities of the steel­works Peine Salz­
gitter AG. The outgoing air flow from shaft Konrad 2, with a steady annual
temperature of approximately +21 °C, still causes a temperature rise in the
ground­water of normally + 10 °C at 10m depth below the surface, as measured
in an observation well in 30 m distance from the shaft. At the ground­water
table 6 m below surface 15,9 °C were measured, resp. +19,2 °C at the depth of ν
13,60 m. The values determinated for the electrical conductivity of the
quarternary ground-water range from between 100 to 2000 pS and thus cor­
respond to those of fresh non saline ground-water.
For a more precise determination of the chemistry of the deep ground-waters,
and in particular of the formation water of the coral oolith in the Konrad
++ ++ - -
mine, the ionic ratio Ca /Mg and Br /CI of all waters investigated in
the Gifhorn Trough were calculated on the basis of further analyses. The
correlation of these ionic ratios of stratigraphie horizons (Fig. 1) cannot
be considered as valid on a supra-regional basis because of the small number
of water samples. An interesting result is, however, the minor dispersion for
ground-waters of the salt table from the region of Salzgitter-Bad and the
Asse range. The annually analyzed coral oolith waters of the Konrad mine
show a distinctly increased Br/Cl-ratio in comparison with water of other
formations. There was no indication that the coral oolith waters communicate
with the salt dome of Broistedt or with waters from neighbouring horizons,
as for example the Dogger |3.
In the ventilation test gallery the climatic data such as moisture and tem­
perature changed only little at the end of the first stage of the experiment
without ventilation. After 584 test days the total water vapour content in the
atmosphere of the test gallery amounts to appr. 115 kg which results in an eva­
poration rate from the near field rock strata of appr. 0,3 g/min. According
to the curve diagramm (Fig. 2) it becomes apparent that the climate in the
gallery has reached a phase of equilibrium. Most important result so far is
that the little moisture content of the rock mass is mobilized only insigni­
ficantly by those mining activities, which cause a certain degree of rock des­
integration near the galleries.
In the second phase following now the gallery is ventilated by means of a
closed circuit ventilation system with air conditioning to freeze the water
vapour. The purpose of this test is to determine the evaporation rate under
influence of the normal mine ventilation. It is beeing expected that the na­
tural moisture content of the iron-ore formation evaporates so that the ore
dries up within a certain distance from the gallery. VI
0.003 Bri Cl ΟΡΟΊ 0,002
Fig. 1: Stratigraphical classification of some selected deep formation
waters of the Gifhorn Trough and of salt table waters of neigh­
bouring salt domes according to ion-gradients (calculated on
mval/1 contents for Ca/Mg and Br/CI). VII
Wasserdampfgehalt der Strecke
kg Γ'
130­
120-
110
100­
90­
80­
70­<

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