Haat has designed, supplied, installed and commissioned a Radioactive Waste Incinerator to dispose of liquid radioactive waste.

 

This was quite a challenging assignment in as much as there were stringent codes to be followed while manufacturing with stage inspections, testing, FAT, SAT and commissioning. 

 

Considering the fact that no leakage should occur during storage or while incinerating, the specification called for 10% radiography of weld joints particularly for stainless steel equipment/vessels. While fabricating, it was required that we do back-purging and passivation of all stainless steel items. The welder had to be qualified under ASME Sec IX for 6G.

 

Not only were the liquid storage tanks to pass radiography tests, a Dilution Chamber where the flue gas from the primary chamber was cooled by addition of atmospheric air, also required radiography tests because the flue gas would carry some radioactive particles.

 

We decided to do 100% radiography of weld joints as we did not want any rework either during internal testing or client inspection. The experienced welders we have were already qualified for 6G by SGS, a French inspection agency located in India. Needless to add that these equipment passed stage inspection as well as final inspection by the client.

 

Similarly the choice of refractory lining was crucial. The accepted castable refractory was subjected to several tests including compressive strength, temperature resistance, linear expansion characteristic, etc.

 

All materials used for fabrication were subjected to mechanical and chemical tests and traceability.

 

The

instruments were chosen from a list of preferred vendors and with calibration certificates valid for a year.

 

ID and FD fans were of reputed makes and performance testing of the fans were carried out both at the vendor`s premises as well as during FAT at our factory and at the installation site.

 

There were pre-filters and HEPA filters which formed part of the assembly, located before the ID fan and these were also procured from well-known and reliable manufacturer as these would give us an SPM output of less than 1 mg/Nm3.

 

The entire set of equipment was assembled at our premises and offered for inspection in the form of an FAT. All fans, motors, pumps were subjected to run test, vibration, leakage, flow rate, etc. 

 

Once accepted, inspection release was given for shipping the incinerator to the destination.

 

The entire project was a learning experience for our Design, Production, Project, Procurement and Service teams, who have gained a good deal of confidence to execute similar projects anywhere.

 

The entire Radioactive Waste Incinerator system has been functioning satisfactorily for many years.

 

 

 

INCINERATOR MODEL RAW