RD&D-Programme 2004 - SKB

Diameter 1,050
Diameter 949
Diameter 1,050
Diameter 949
160
50
230
150
50 mm copper
8.9 g/cm 3
BWR type
PWR type
Nodular iron
7.2 g/cm 3
Figure 5-2. Cross-section of canister. All dimensions are given in millimetres.
5.1 Design premises
The design premises for the canister were presented for the first time in RD&D-Programme 98
/5-1/ and were established in the overall design premises /5-2/. These serve as a basis for the
work of designing the canister in detail and entail in brief that:
• The canister must withstand all known corrosion processes so that it is expected to remain
intact in the deep repository for at least 100,000 years.
• The canister must be designed to withstand the mechanical stresses that arise in a deep
repository in granitic rock down to a depth of 700 metres.
• The calculated strength of the canister must also take into account the loads that can be
expected during an ice age.
• The surface dose rate on the outside of the canister must not exceed 1 Gy/h.
Conclusions in RD&D 2001 and its review
SKI takes a positive view of the fact that SKB has compiled the state of knowledge on copper
corrosion. As SKI has previously stated, the next step must be to apply this knowledge in the
safety assessment and in the work on the design premises, since the reasoning from this work
will result in the determination of the thickness of the copper.
SKI views the ongoing work with the design premises for the repository, and the acceptance
criteria for the canister, as very important. Delays in this work may delay other parts of the
canister work. The design premises should serve as controlling conditions for many activities
and may need to be revised after the consequence analyses that must be performed in order to
show that the design premises and acceptance criteria are adequate.
46 RD&D-Programme 2004