Is there a list of acceptable materials for LL radiation? 3

[Lovison]

Has anyone a list of acceptable materials such as;

Stainless Steel, elastomer's, motor's and lubricants
that are acceptable in LL radiation service?

What is considered LL radiation?

I've checked out nrc web pages and can't find anything
really outlined. A thread connection would be nice
if some has a reference for me. Wayne E. Lovison
service-parts@naglepumps.com

 

Title 10 Code of Federal Regulations Part 20 is the regulations pertaining to the release limits of radioactive materials. 10CFR 20 can be found at

http://www.nrc.gov

 

[ag]

hi
there is no such thing as ll radiation. probably u r referring to radiation caused by low level activity sources. normally in radioactive service SS304L is normally used as vessel and piping moc.
ag

 

[BigAL]

Generally, if your radiation level is below 1 E4 rads TID, it is considered mild environment. At this level just about any material is qualified to be used. The company I work for has taken material to 1 E7 in various configurations.
If you are intending to sell to the Nuke Power industry, you need to set up a 10CFR50 Appendix B quality program and be set for a very stringent quality audit. Then, run the material through a test lab and see if it holds up. At that time you can offer it for sale.

 

[jrri]

Generally, mild or LL radiation it is below 1E4 rads, mechanical properties of stainless steel are not affected by these levels of radiation, nevertheless other materials like elastomers, grease or oils are affected.
For example elastomers increase hardness and decrease elongation depending of the composition.
if you make a more detailed question may be possible indicate to you radiation level.

 

[Bob167]

Hi Wayne,
This is a list taken from a nuclear industry design specification:-

Recommended Materials (with 'good' stability at ambient temperatures in air with irradiation levels of 100,000 Grays):

Polyurethane, SBR Butadiene styrene, Ethylene propylene, copolymer EPDM, Polychloroprene;
Polystyrene, Polyethylene, Hypalon, ABS, PVA, Polyamide, Nylon, Polycarbonate, Polyester (mineral or glass filled), Mylar (Melinex)

Epoxy and Phenolic Adhesives

Mineral Oils (aromatics are more resistant than aliphatics) NB Bearing manufacturers will supply bearings packed with special grease if requested.

DO NOT USE:-

Fluorocarbon, Butyl Rubber, Silicone rubber, Neoprene, Polypropylene, Phenolformaldehyde

Natural (animal, vegetable) Oils.

Hope that this helps

Regards,

Bob