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Reply #46: Well, Aliens are also beyond design basis, but [View All]

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Throckmorton Donating Member (1000+ posts) Send PM | Profile | Ignore Wed Aug-31-11 01:19 PM
Response to Reply #45
46. Well, Aliens are also beyond design basis, but
Edited on Wed Aug-31-11 02:03 PM by Throckmorton
The Station Blackout (SBO) diesel isn't CAT-1, nor is it as large as the Primary Diesels. It doesn't autoload and requires entry into Emergency Operation Procedure space to use. This is an operator burden, and can distract from other duties.

Beyond design basis events also present the possibility that a single point of vulnerability will compromise multiple systems. The EDG's are redundant, but they are not diverse. A single beyond design basis event has the potential to fail both from a common cause. The SBO diesel, while diverse from the main diesels, is not a 1 for 1 replacement for them, nor has it been analyzed or tested for all design basis events as it is not Cat-1.

The SBO events are not seismically induced, but are postulated to run along the lines of complete loss of offsite, with an attendant loss of all onsite prime mover based AC power due to a maintenance issue or fuel supply failure with both diesels. This is similar to the ATWS rule, in that it does not cover all scenarios, only those demonstrated to be the most likely. In the ATWS Rules case, Reactor Trip Breakers (TCB's)that fail to open on demand due to a common cause issue (At Salem, this was improper maintenance on all TCB's, rendering them unable to respond to a valid trip signal from the reactor protection system).

Those of us that do this kind of thing don't bother looking at what went right, we look at what could have happened and what went wrong. We tend to leave the flowery prose and the feel good press releases to the Liberal Arts Majors.

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  -Xpost on the Anna Nuclear plant nadinbrzezinski  Aug-24-11 01:30 AM   #0 
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  - Oh goody... no really  nadinbrzezinski   Aug-24-11 11:10 AM   #2 
  - The comments ARE "hilarious" because they highlight how little people understand the topic.  FBaggins   Aug-24-11 11:21 AM   #3 
     - No they are hilarious for other reasons  nadinbrzezinski   Aug-24-11 11:23 AM   #4 
        - Nah... that's pretty much the main reason.  FBaggins   Aug-24-11 12:40 PM   #5 
           - Alas IT IS Chernobyl on steorids  nadinbrzezinski   Aug-24-11 12:57 PM   #6 
           - "And then there is Irene"... doesn't that just prove my point?  FBaggins   Aug-24-11 01:04 PM   #7 
              - Read the NRC report and then chuckle a lottle more  nadinbrzezinski   Aug-24-11 01:12 PM   #8 
                 - You going to link to that report?  FBaggins   Aug-24-11 01:21 PM   #9 
                    - I think that since you claim to be a member of the industry  nadinbrzezinski   Aug-24-11 01:31 PM   #10 
                       - Sorry... wrong yet again.  FBaggins   Aug-24-11 01:39 PM   #11 
                          - So rachel madow imagined the threat report too  nadinbrzezinski   Aug-24-11 01:47 PM   #12 
                             - Nope. You just blew it all out of proportion.  FBaggins   Aug-24-11 01:58 PM   #13 
                                - Yep, whatever  nadinbrzezinski   Aug-24-11 02:08 PM   #14 
                                   - So let's see if I've got this straight.  FBaggins   Aug-25-11 01:50 PM   #21 
                                      - Actually, raising it to an 8 would leave a negative safety factor for previous quakes.  AtheistCrusader   Aug-30-11 04:30 PM   #42 
                                         - Not for that area.  FBaggins   Aug-30-11 04:47 PM   #43 
           - Aw...  SpoonFed   Aug-24-11 03:21 PM   #15 
              - Put up or shut up.  FBaggins   Aug-24-11 03:28 PM   #16 
                 - I leave most of the fun to the casual observer...  SpoonFed   Aug-24-11 06:43 PM   #17 
                    - And before you try to get into it some more...  SpoonFed   Aug-24-11 06:57 PM   #18 
                    - Why?  FBaggins   Aug-25-11 01:04 PM   #20 
                    - The answer to your last question is clearly you. Hint its still a straw man if...  FBaggins   Aug-25-11 01:00 PM   #19 
                       - tl;dr Frodo is never wrong. *yawn* n/t  SpoonFed   Aug-25-11 02:51 PM   #22 
                          - You think I'm shocked that you can't respond?  FBaggins   Aug-25-11 03:33 PM   #23 
                             - Respond?  SpoonFed   Aug-26-11 02:58 PM   #24 
                                - Yeah. You know... like try to prove you had a clue.  FBaggins   Aug-26-11 03:11 PM   #25 
  - Really?  AtheistCrusader   Aug-29-11 07:25 PM   #26 
     - One of five actually.  FBaggins   Aug-29-11 09:43 PM   #27 
        - Too thin.  AtheistCrusader   Aug-29-11 09:47 PM   #28 
           - I don't think you're thinking that through.  FBaggins   Aug-29-11 09:52 PM   #29 
           - How many minutes to meltdown....the cooling quits and nothing works as planned?  Fledermaus   Aug-29-11 10:16 PM   #30 
           - Depends on what else is included in "nothing works"  FBaggins   Aug-30-11 08:45 AM   #31 
           - How big are your EDG's?  Throckmorton   Aug-30-11 08:51 AM   #32 
              - We really can't say it's a "big deal" without more information.  FBaggins   Aug-30-11 08:57 AM   #33 
                 - It did not meet its tech spec for operablity,  Throckmorton   Aug-30-11 10:38 AM   #34 
                 - Which doesn't rise to the level of a "big deal"  FBaggins   Aug-30-11 11:38 AM   #36 
                    - If I wanted to lose my job I could  Throckmorton   Aug-30-11 12:23 PM   #37 
                       - But you understand what I mean by "artificial" big deal, right?  FBaggins   Aug-30-11 12:29 PM   #38 
                          - Hypothetically, I would not consider something like a cooling water jacket failure,  Throckmorton   Aug-30-11 03:08 PM   #39 
                             - Is that something that can be fixed in a couple hours on a unit that large?  FBaggins   Aug-30-11 03:26 PM   #40 
                                - Terminology may be different for a generator of that size  AtheistCrusader   Aug-30-11 04:28 PM   #41 
                                - If I could send you pictures and diagrams I would,  Throckmorton   Aug-31-11 08:36 AM   #44 
                                   - So if I read that correctly, ..  FBaggins   Aug-31-11 10:09 AM   #45 
                                      - Well, Aliens are also beyond design basis, but  Throckmorton   Aug-31-11 01:19 PM   #46 
                                      - Try again with a head gasket leak.  AtheistCrusader   Aug-31-11 03:51 PM   #47 
                                      - Watch out...  SpoonFed   Sep-02-11 12:07 PM   #48 
                                      - ...  bananas   Sep-04-11 08:26 AM   #49 
                 - and I have a lot more info. N/T  Throckmorton   Aug-30-11 10:39 AM   #35 

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