Uranium Corrosion Chemistry
NNL has extensive experience in providing a professional uranium corrosion chemistry service for customers.
- Support to decommissioning projects including encapsulation of natural uranium metal and uranic compounds in cement-only grout systems, cement/polymeric matrices and cement/ sludge grout systems
- Multiple cement matrices, including Portland cement, blast furnace slag, ground granulated blast-furnace sag and pulverised fuel ash. All have been prepared using a variety of water ratios
- Our service includes determination of the most efficient water ratio and the use of various additives (for example, polymeric materials) to reduce water volume
- Sample cement matrices are cured at a range of temperatures (20-60ºC), over a range of times to ensure a complete picture is presented to customers
- Following corrosion trials, NNL can dissect the grout and product in an inert atmosphere and characterise/analyse the uranium and corrosion products
Strain generated in encapsulants through uranium corrosion
To understand the corrosion of uranium in grout systems experiments have been conducted to measure the strain developed in restricted uranium pennies encapsulated in different grout systems. The grouted samples are cast into ~ 300cm3 tubes which are then held in a press, using a load-cell to monitor the forces generated longitudinally through the grout as a result of corrosion of the uranium.
This press set-up is held within a gas tight outer vessel and placed in a waterbath. The corrosion rate is monitored through temperature measurements and pressure increases through hydrogen generation from the corrosion reaction. Acrylic tubes were used to cast the samples to allow visual observation of the product to be taken as the strain increases and corrosion progresses. The grout system can be observed to crack during the progression of the trials.
Myrian Wood, Business Leader
t: 019467 79168
m: 07702 778337