Estimation of storage capacity needed or limits.

Comparison with existing storage facilities.

Lise-Lotte Spontón

TW5-TSW-001, D4

Final meeting, TW5-TSW-001 and -002, 23-24 October 2006, UKAEA, Culham, UK

Task description

• Storage volume needed for Model AB

• Suitable packaging

• Cost (storage and recycling/reuse vs. disposal)

• Centralized or distributed storages

• Acceptance criteria for tritium

• Cooling requirements

Cost (1)Cost comparison between storage and recyling/reuse and disposal

• DIFFICULT!!!

• Not much data available (found)

• Swedish data

Cost (2)

CLAB, Swedish interim storage for nuclear fuel. In operation since 1985.

Planned, Swedish, deep repository for the nuclear fuel, which is now in CLAB.

Cost (3) CLAB

(MSEKd) Deep

repository (MSEKd)

Deep repository, above ground

facilities (MSEKd)

Investment 3,000a 4,900b 1,880b Operation and maintenance 62/yearc 1,180 3,360 Decommissioning (and backfilling of repository)

450 3,110 110

Total cost for deep repository = MSEK 14,540 Total cost for CLAB, 50 years = MSEK 6,600

100 years = MSEK 9,700

Disposal is a factor 1.5 more expensive than storage (100 years), and a factor 2.2 more expensive than storage in 50 years. To the cost for storage, possible cost for recycling should be added.

Cost (4)

Nothing to compare with…

Planned, Swedish repository for long-lived LLW and ILW for core components and reactor internals.

Waste will be interim stored in rock caverns and then put into this repository. Interim storage is planned in radiation shielded casks, which will be simple to handle after decay. The repository will consist of rock caverns at a depth of about 300 m.

Waste package: concrete moulds, 1.2 x 1.2 x 4.8 mTotal volume: 11 500 m3

(MSEK) Investment 420 Operation and maintenance (about 10 years) 140 Decommissioning and backfilling 110 Total 670

Packages

Example: Divertor front for PPCS Model B (2002)Time after shut

down (years)

Limiting nuclide

Contact dose rate (mSv/h)

Required shielding

(cm) 50 Co-60 287 50 (concrete)

15 (steel) 8 (lead)

100 Nb-94 0.8 < 2 mSv/h Contact dose rate limit for packages to be transported: 2 mSv/h

Swedish S-Box, side 1.2 m

Cooling requirements at shut down (1)

Sourcewater/air Outlet

Storage – water/air

Inlet flow

Outlet flow

MELCOR model

Source Temperature Water: 15 C Air: 20 C

Storage volume Temperature Water 15 C Air: 20 C

Pressure 1 bar Volume 20 000 m3 Hight 20 m Pool depth 18 m3 Pool volume 18 000 m3 Decay heat At shut down 1.232108 W 5 years after shut down 1.785106 W

Cooling requirements at shut down (2)

Sourcewater/air Outlet

Storage – water/air

Inlet flowOutlet flow

Scenario Time Volumetric flow

(m3/s)

Temperature in Storage volume

(C) Dry At shut down High High After 5 years 11 100 Wet At shut down 2 29

Question: Can the materials used in Model AB (and B) be stored in water?

Example on dry storage containers, steel lined concrete containers, used for CANDU fuel bundles.

• Package requirements

• Calculate storage volume needed for Model AB

Left to do