20 mohlfeld retreiving vs emergency_preparadness
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Asse II Mine – Retrieval of the Waste Taking into Account the Best Possible Emergency Preparedness
Matthias MohlfeldFederal Office for Radiation
Protection (BfS), Germany
Washington, DCSeptember 7-9, 2016
2
Key Data
BerlinHannover
Hamburg
Köln
München
Frankfurt
Leipzig
Asse II salt
Asse II mine Waste emplacement: 1967-78
Low and intermediate level waste
Brine inflow from the overburden rock since 1988
Intended option for decommissioning: Retrieval
3
The Mine
A “research mine” that should never have
been used for the disposal of radioactive
waste.
The Asse II mine. The fault. The problem. The task.
Four Steps - One Problem.
4
5
Asse II – The Mine
The Asse II mine. The fault. The problem. The task.
6
Mining vs. Disposal
Purpose of mines Purpose of repositories
Maximal extraction of raw materials Safe enclosure of radioactive waste
7
The Asse - A Salt-Mining Region
8
Asse II – The Fault
The Asse II mine. The fault. The problem. The task.
9
Emplacement
EC 8/750 (1975)
EC 4/750 (1968)
EC 7/750 (1978)
EC 8a/511 (1987)
Period
1967 – 1978
Volume
125,787 waste packages / ca. 47,000 cubic meters
Type of waste
Low- and medium-level radioactive waste
10
Asse II – The Problem
The Asse II mine. The fault. The problem. The task.
11
The Mountain Is Moving
12
Inflow of Brines since 1988
1988, 532 m
Since 1998 the collected brine rate is about 12 m³/d
Brine is almost saturated
13
Asse II – The Task
The Asse II mine. The fault. The problem. The task.
14
Decommissioning According tothe Atomic Energy Act (AtG)
2009§ 57b AtG
„The Asse II mine shall be decommissioned immediately.“
2009 - 2010
2013
Retrieval Relocation Backfilling
§ 57b AtG
„The Asse II mine shall be decommissioned immediately. […]The Asse II mine shall be decommissioned after the retrieval of the radioactive waste.“
15
Tasks of the BfS
Decomissioning of the mine
Stabilisation and emergency
preparedness
Operation of the mine under nuclear law and mining law
Tasks of the BfS
Shaft 5
Fact-findingInterim storage facility
Retrieval machinery
Infrastructure
Retrieval of the waste
16
Stabilisation and Emergency Preparedness -
Measures to stabilise the mine openings and to protect the emplacement chambers:• to continue safe operation• to maintain the integrity as best as possible• to achieve the best possible emergency preparedness in the event of
an increase in brine inflow • to keep the basis for the retrieval of the waste
Prepatory measures for fast reaction in the event of an emergency:• for fullfilling the waste chambers• for flooding the mine with saturated brine• for stabilizing the mine with compressed air• for the shaft closures
17
The Mine Today
18
Exploration Shaft 5
19
Interim Storage Facility
Storage area with buffer store
Salt processing
Collection of waste water
Workshop and decontamination
Store for additives
Supply building
Waste package acceptance
Conditioning
Drying Measurement hall
Office and social buildings
20
Demands and Contradictions
Retrieval? - Immediately!
Interim storage facility? - Nimby!
Disposal at Konrad Repository? - No!
Retrieval? - Mission impossible!
21
Asse Decommissioning Project – Time Schedule
Planning / construction shaft 5
Retrieval
Fact finding step 1 - drilling
Emergency preparedness and remediation
Planning / construction of interim storage facility incl. conditioning
“Lex-Asse”: Retrieval legally laid down as decommissioning option to be pursued. Enables parallel action (to invest before the results of the fact finding are available)
22
Thank you!
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