×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Dry Underwater Bushings in High Radiation Fields

Dry Underwater Bushings in High Radiation Fields

Dry Underwater Bushings in High Radiation Fields

(OP)
Hello All,

I'm looking into broadening my departments horizon on available bushing material for some of our equipment designs. Quick background, I work in the nuclear industry and develop hand operated equipment that interfaces directly with irradiated fuel assemblies. The bushing must be able to withstand the dose and heat produced from an irradiate fuel assembly. No greases, oils, etc. are allowed in the plant primary coolant system (spent fuel pool, reactor pool) so all bushings currently have to operate dry or rather with water as lubrication.

When I joined the department, the most common bushing material used was SAE 660 which is a standard bronze material. I've had many bushings seize and lockup using this material or have scarring after only several uses. This is mostly caused from not having an oil film, in my opinion as the bronze is not self lubricating.

After doing some research I've started trying Graphalloy products as its self lubricating underwater. Our first deployment of equipment with this bushing material performed well until after a few days attached to the fuel assembly. It appears possibly they began to swell, which we can account for in future designs.

What I'd like to know is if there's any other options out there we can pursue, or does anyone have any similar experiences they can share?



Regards,

~Anthony

RE: Dry Underwater Bushings in High Radiation Fields

(OP)
A small update to this thread in effort to gain more traction.

I inspected the Graphalloy bushings post deployment after they had spent ~72 hours resting on top of an irradiated fuel assembly. Thankfully no swelling, scarring, or wear was found and will be going back in the field next month. Due to the cost and lead times to acquire these bushings I'm still open to other suggestions if anyone else has any experience here.

To recap; I'm looking for underwater bushing materials that are designed for self-lubrication and can withstand radiation dose.


Regards,


~Anthony

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close