We always have the option to reconcile the differences between the codes.. on a lot of stuff, like cranes we have, but on things like piping and steel, we do not... however, we do use the latest codes for new design on some things...
At least I don't glow in the dark.
That's where nuclear is tricky, we have to go with the licensed code of record, which per our license is the 7th edition. Typically, for new design we always use the current code, but for the existing stuff we don't go back and reconcile the design to meet today's code requirements.
And since the 7th edition was the code of record, we are reanalyzing everything using the 7th edition instead of the current year code.
Thanks to everyone for your responses on this post! I appreciate all of your expertise.
DWHA, you say that the NRC does not allow the use of the CMTRs for the increased yield strength. Where does this come from?
This is actually the issue I'm running into because the NRC tells us that it is not in compliance with the AISC code if we use the CMTR for yield strength. I disagree...
CMTR = certified mill test report
We want to use the reported minimum values less a small percentage for uncertainty.
Fortunately, budget is not a problem for this project... we could always take samples from the steel to prove the steel yields at a higher value than 36 ksi.
My company is looking at an existing steel structure to determine if it is capable of handling increased loading due to the heavier equipment being installed on the operating deck.
The steel structure was originally designed and constructed in the 70s using A36 steel, ASD design to the 7th...
Just looking at the magnitude of the kinetic energy that is generated from a drop at that height, I have a feeling we may not be able to avoid costly repairs, period. Concrete does not dissipate energy very well. Thanks for your inputs!!!
A load of 360000lb is dropped from 50' over head in a scenario of crane failure. The dropped load can not cause the pipe below grade to leak. The pipe must stay in tact for cooling. The load covers a large area and I can not imagine how over a 20'x20' area the rebar in the slab does nothing...
My company requested a load drop analysis on a reinforced concrete slab to check a 30" pipe 7' below grade for failure. The vendor gives us a report that the pipe will fail. The concrete is subjected to punching shear failure. When I look at the calculation, I notice they do not take into...
I have two and I don't know what I'd do without both. I can have a calculation up on one screen and the code on the other or a reference drawing. I highly recommend the upgrade.
I found this from ASME NUM-1, Nuclear Crane Code
Interfacing structures and foundations shall be designed such that the maximum resisting moment against overturning (based upon dead load plus rated load) will provide a safety factor of 2.
This seems fairly reasonable, not too low from a risk...
Probability of a seismic event in Florida.. very small.
However, nuclear requires seismic design, so we design for it.
And it would be impossible to stand under this crane unless you were swimming in the pool, which I would not advise under any scenario.
