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  1. mauner

    cast iron material

    Thanks TVP for the link - it is very informative. I'm not doing an analysis, but comparing materials used in a motor that will pass MIL-S-901 shock to a commercial NEMA motor. I will be testing the motor in the June and concerned that it might crack, unless its mounted on rubber. If the...
  2. mauner

    cast iron material

    Thanks mrfailure! However, I meant to ask why ASTM A278 material doesn't list a yield strength. My thought was maybe it doesn't yield before breaking. Hence, only a UTS is listed. Like you said, ASTM A47 is malleable with a yield of 220 MPa and UTS of 340 MPa. How can I compare an electric...
  3. mauner

    cast iron material

    Thanks for your response, but I have some follow up question. Is the gray iron per FC200 brittle? Why doesn't ASTM A 278 spec list a UTS? Which material is better for handling shock or sudden impulse load? (is it a malleable iron) Thanks again, mauner
  4. mauner

    cast iron material

    Hi everyone, Can anyone provide a comparison between cast iron for a motor frame between these two specifications? ASTM A47/A47M JIS G5501 FC200 Does FC200 correlate to the strength? Thanks in advance, mauner
  5. mauner

    San Onofre plant

    How many of the 23 are vulnerable to the "one-two punch" of an earthquake and tsunami? For SONGS, wikipedia states that the decommisioned unit 1 is being used to store fuel - is it under the 6 foot thick concrete containment? Does anyone know how much time needs to pass before a fuel bundle...
  6. mauner

    San Onofre plant

    I don't think the San Onofre plant has a spent fuel pool with a "tin roof" over it like the Fukushima plant. I think the safest on-site storage method will be in a dry-cask. The NRC should mandate all spent fuel to be removed from the pool and moved into a dry-cask storage as soon as it is...
  7. mauner

    PV roof mounts

    Thanks to all who responded!
  8. mauner

    PV roof mounts

    Thanks GregLocock for the link, but it didn't really answer the question. Here is my annual production: Date total energy produced(kWh) 4/3/2010 1686.71 5/1/2010 1625.23 6/1/2010 1633.85 7/1/2010 1674.91 8/1/2010 1491.92 9/1/2010 1430.93 10/1/2010 1172.9 11/1/2010 951.5 12/1/2010 757.09...
  9. mauner

    hindsight- how to avoid repeat of Fukushima

    Thankyou davefitz for being someone who understands the point of my lesson learned. How do we get these concerns to the NRC task force investigating the Fukushima event for U.S. plants?
  10. mauner

    hindsight- how to avoid repeat of Fukushima

    My point about the spent fuel was that it is safer in dry cask then in a pool with a "tin roof" over it. The casks are inerted and welded closed. It is my understanding that the dry-cask design was based on the shipping container design done in the 1960's, which can withstand truck, train and...
  11. mauner

    hindsight- how to avoid repeat of Fukushima

    I heard a news report that Japan delayed shipment of reprocessed fuel from France because they didn't have enough human resources to monitor the shipment. Based on this, I'm wondering how much fuel was in the spent fuel pool and how does it compare to US Plants? It is my understanding that...
  12. mauner

    PV roof mounts

    thread626-261703 My roof has a 52 panel PV array with a DC rating of 11.7 kW. The standard installation of U-tracks are bolted to the roof, which has a 30 degree angle. My peak power production occurs in late March and September is 10 to 10.5 kW for the solar noon hour - my house is in New...
  13. mauner

    Fukushima No. 1 loss of coolant due to earthquake

    How can you determine that fuel has melted through the reactor vessel based on radiation levels? What does the RPV provide 4" steel = 1/10 thickness? Does anyone know the contact raditation reading for a spent fuel bundel out of water? Could abnormal radiation levels occur due to a shift in...
  14. mauner

    how bad is the meltdown?

    If there is no water, then fission cannot be sustained (subcritical). Decay heat is not sufficient to "...melt or burst its way through the pressure vessel" [unlike Chernobyl which became prompt-critical and blew up the fuel (deflagration), setting the graphite moderating rods on fire] Like...
  15. mauner

    how bad is the meltdown?

    My analogy was not welding material, but the process of melting solder. And yes, a greater heat source is required, but my point was that there is not sufficient heat available from decay heat alone. Conduction through the pressure vessel to ambient and boiling water will prevent the fuel from...
  16. mauner

    how bad is the meltdown?

    I had a heat transfer professor in college who evaluated core damage at TMI. His analysis concluded that it was impossible for fuel to melt through the reactor vessel. (Otherwise it would have happened when the operators turned off the ECCS) I don't know the details of his evaluation, but I...
  17. mauner

    hindsight- how to avoid repeat of Fukushima

    I did find it interesting that the design basis accounted for 6.51 m surge and all the problems resulted when it was hit by a 7m surge. Excerpt from WNN "One hour later the plant was inundated by a tsunami said to be seven metres in height, compared to design basis surge of 6.51 metres." Maybe...
  18. mauner

    hindsight- how to avoid repeat of Fukushima

    I think item C becomes irrelevant if switchgear and substations become submerged. For the nuke plant I worked at, we would have to declare all of the EDG inoperable if the river water level became high enough to cause a problem. I don't think its possible to get an instant type flood there, but...
  19. mauner

    Aluminum Hull

    MadMango, KENAT is correct. Most US Navy ships do not have aluminium hulls. I think composites will be the material of choice for future ships.
  20. mauner

    Checker

    Here is an operational answer for the checker at a nuke plant that I worked at: Verbatim compliance is required when performing a procedure like a quarterly test of an ECCS. Because operators have accidently turned the wrong switch or opened the wrong valve, they have been given the option to...

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