ABM PM December 04, Page 1. Welcome to Alternative Buffer Material Project meeting , Lund T C LAY ECHNOLOGY AB

Transcription

1 Page 1 Welcome to Alternative Buffer Material Project meeting , Lund

2 Agenda 08:30 General project information Torbjörn Sandén Page 2 Introduction to Analysis and SKB part Daniel Svensson AECL Microbe Study Daniel Svensson 10:00 Coffee 10:15 Presentations on ABM analyses Posiva Arto Muurinen Posiva/BTech Sirpa Kompulainen BGR Reiner Dohrman and Stephan Kaufhold SKB Microbe study Karsten Pedersen

3 Agenda 12:00 Lunch Page 3 13:00 Reserved time for any other Posiva Petri Korkeakoski 13:30 Discussion Performed buffer analysis Uptake and planned analysis Next meeting 15:00 End of meeting, ABM - Coffee 15:15 Presentation of new cement-bentonite project: Concrete and Clay Patrik Sellin 15:45 Reserved time for recent iron-bentonite research related to the planning of ABM analysis and/or excavation. Nicolas Michau and Urs Mäder Characterisation of 8 year old Fe-bentonite specimens Sirpa Kompulainen Posiva Fe-bentonite research plan Paul Wersin 17:30 End of meeting

4 Page 4 Introduction to the ABM project Torbjörn Sandén, Clay Technology AB

5 This presentation Page 5 Objectives with the tests Experiment design Results from measurements in field Termination of package 1

6 Objectives Page 6 Detect and describe differences between different clay materials regarding: Manufacturing and handling of blocks Mineral stability Physical properties

7 Experiment design Page 7 Experiment design based on LOT with some modifications: Different materials are tested Less instrumentation Shorter deposit holes (3m) Complete package length heated Central tube made of steel No inserts or tracers Ikosorb Deponit Ibeco Seal Friedland Asha 505 Calcigel Callovo-Oxfordian Febex granulate granulate+quarz Kunigel V1 Rokle Deponit Asha 505 Rokle Callovo-Oxfordian Ikosorb Friedland Febex granulate+quarz Ibeco Seal Calcigel Kunigel V1 granulate 4 m 4 m Short-time (1-2 years). Heated from start. Artificial saturation from start. Medium-time (2-4 years). Heating started when buffer was saturated. Artificial saturation from start. Long-term ( 5 years). Heated from start. No artificial saturation.

8 ABM. Test layout, Package 1 Page Main heater (0 W) Top heater (500 W) Bottom heater (500 W) Ikosorb Deponit Ibeco Seal Friedland Asha 505 Calcigel Callovo-Oxfordian Febex granulate granulate+quarz Kunigel V1 Rokle Deponit Asha 505 Rokle Callovo-Oxfordian Ikosorb Friedland Febex granulate+quarz Ibeco Seal Calcigel Kunigel V1 granulate Bentonite pellets Heaters (central, top and bottom) Central tube (steel) Sand layer between blocks and rock Thermocouples at 5 levels: Inside tube and 5, 40 and 60 mm from tube (2 temperature indicators between each block) Installed materials: 6 granulate 2 gr.+ quarz 2 Ikosorb 2 Deponit CA-N 2 Ibeco SEAL M-90 2 Friedland 2 Asha Calcigel 2 Callovo Oxfordian 2 Febex 2 Kunigel V1 2 Rokle 2 Total 30 blocks 300

9 Package 1, Temperature developement Page 9 Ikosorb Deponit Ibeco Seal Friedland Asha 505 Calcigel Callovo-Oxfordian Febex granulate granulate+quarz Kunigel V1 Rokle Deponit Asha 505 Rokle Callovo-Oxfordian Ikosorb Friedland Febex granulate+quarz Ibeco Seal Calcigel Kunigel V1 granulate Package 1: Artificial saturation from start Heated from start Temperature, Temperature, Temperature, mm from pipe 40 mm from pipe 60 mm from pipe 5 mm from pipe 40 mm from pipe 60 mm from pipe 5 mm from pipe 40 mm from pipe 60 mm from pipe Time, days (Day 0-4 dec 2006) Time, days (Day 0-4 dec 2006) Time, days (Day 0-4 dec 2006)

10 Package 1, Temperature distribution Page 10 Ikosorb Deponit Ibeco Seal Friedland Asha 505 Calcigel Callovo-Oxfordian Febex granulate granulate+quarz Kunigel V1 Rokle Deponit Asha 505 Rokle Callovo-Oxfordian Ikosorb Friedland Febex granulate+quarz Ibeco Seal Calcigel Kunigel V1 granulate

11 Artificial water saturation. Page 11 One system is supplying both package 1 and 2 with water Total amount of water injected is higher than the volume needed for saturation (less than l) By closing the water supply to package 2 for some days it was detected that leakages are in package 1. The water pressure applied is not high enough in order to avoid boiling (1.8 bar is enough to avoid boiling at 117 C while 2.7 bar is needed for 130 ). Pressure, ba No artificial water injection Time, days Water pressure Injected water Injevted water volum

12 Artificial water saturation. Page 12 Depending on the boiling, parts of the bentonite are affected by other processes (vapour transport and condensation) No artificial water injection. Pressure, ba Water pressure Injected water Injevted water volum Time, days

13 1 x RH Package 2, Humidity Package 2: Artificial saturation from start Heating starts after saturation Package 2, Relative Humidity (scatter in measurements removed) 105 Page 13 1 x RH 1 x RH Relative H umidity RH block 3 RH block 9 RH block 22 RH block 28 1 x RH Time, days (Day 0-4 dec 2006)

14 Package 2, Temperature developement Heaters were started 19 August 2008 Temperature, mm from pipe 40 mm from pipe 60 mm from pipe Page Temperature, mm from pipe 40 mm from pipe 60 mm from pipe Time, days (Day 0-4 dec 2006) Time, days (Day 0-4 dec 2006) Temperature, mm from pipe 40 mm from pipe 60 mm from pipe Time, days (Day 0-4 dec 2006)

15 Package 2, Cracking Page 15 The concrete block at the top has cracked and will be reinforced before increasing the temperature.

16 Package 3, Temperature developement Temperature, mm from pipe 40 mm from pipe 60 mm from pipe Page 16 Package 3: No artificial saturation Heated from start 20 Temperature, Temperature, Time, days (Day 0-4 dec 2006) 5 mm from pipe 40 mm from pipe 60 mm from pipe 5 mm from pipe 40 mm from pipe 60 mm from pipe Time, days (Day 0-4 dec 2006) Time, days (Day 0-4 dec 2006)

17 Package 3, Temperature distribution Page 17

18 Termination of Package 1? Page 18 The target temperature, 130 C, was reached the 4th of december The temperature was decreased to C for about 120 days depending on high water inflow and a decrease of the water pressure. The termination will be made with the same technique as used in the LOT project with some exceptions. Temperature, mm from pipe 40 mm from pipe 60 mm from pipe Time, days (Day 0-4 dec 2006)

19 Termination of Package 1 Page 19 Heater decrease during 1 month. 2 x core drilled holes (d=300 mm) Overlapping drilling around the hole (percussion drilling, d=125 mm) Wire sawing in order to release the package in the bottom

20 Termination of Package 1 Page 20 In order to stabilize the rock column during lifting, beams are positioned around it and straps are used to keep everything in place The lifting is made by use of steel wires placed in three directions around the package Due to the sand filter in ABM, it is important to secure the steel tube and the bentonite relative the rock parcel. A scenario could otherwise be that the bottom of the rock column falls of and the bentonite and tube with it.

21 Transport to a dry niche Page 21

22 Releasing the bentonite from the rock Page 22

23 Laboratory tests Page NW 7 9 Ikosorb Deponit Ibeco Seal Friedland Asha 505 Calcigel Callovo-Oxfordian Febex granulate granulate+quarz Kunigel V1 Rokle Deponit Asha 505 Rokle Callovo-Oxfordian Ikosorb Friedland Febex granulate+quarz Ibeco Seal Calcigel Kunigel V1 granulate SE Scope of laboratory tests after termination is not decided. Water ratio distribution Density distribution Swelling pressure Hydraulic conductivity Rheological properties Mineralogy (ICP/AES, CEC, XRD etc.) Pore water chemistry Iron bentonite A B C

24 Compilation of test status Page 24 Package 1. When are we going to terminate the test? Scope of laboratory investigations? Package 2. After reinforcement of the concrete at the top, the temperature will be increased. Package 3. Have been running at target temperature for one year.