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From Dean's link on the steam generators:

@lilly.. I hadn't left yet... yes on that comment, must find a common mode failure and see if the sizing of the tubes inorder to gain efficiencies ie: thinner tubing for better heat transfer etc, is something that results in corrosion or thinning

HERE IS A PRIME EXAMPLE that can some times lead to problems... "allowing a deviation to the code" This is from that post -
However, for the SONGS Unit 3 RSGs, the fabricator requested and the licensee approved a deviation to allow using an alternative method (in this case ACAG) to prepare the LAS surface for butter application. According to the American Society of Mechanical Engineers Boiler and Pressure Vessel Code (ASME Code), Section IX, this deviation did not require the requalification of the welding procedure because this aspect of the weld joint preparation was not considered an essential variable.

WILL RETURN

To answer @Lilly's question also note this report is from 2000
SUBJECT: SAN ONOFRE NUCLEAR GENERATING STATION, UNITS 2 AND 3 - RE:
STEAM GENERATOR SLEEVING (TAC NOS. MA4487 AND MA4488)

Dear Mr. Ray:

The purpose of this letter is to acknowledge your April 5, 2000, letter which requested that the
U.S. Nuclear Regulatory Commission (NRC) staff suspend its review of your proposed license
amendments (submittal dated December 22, 1998, PCN-489) relating to the installation of
Westinghouse laser-welded sleeves as a tube repair method at San Onofre Generating Station
(SONGS), Units 2 and 3.

The NRC staff is discussing this issue with the Westinghouse and Wisconsin Public Service
Corporation regarding implementation of this tube repair methodology at Kewaunee Nuclear
Power Plant. The technical discussion that the staff is engaged in with the Westinghouse and
Wisconsin Public Service Corporation also applies to your proposed amendments for SONGS.
Pending resolution of this issue with the Westinghouse and Wisconsin Public Service
Corporation, you do not plan to implement the proposed tube repair method during the current
cycle. As a result, you have requested the NRC staff suspend its review of your license
amendment request. In accordance with your request, we have discontinued our review of your
amendment application. The technical assignment control (TAC) numbers MA4487 and
MA4488 under which our review was being performed are, therefore, closed. You have
indicated that at a future date, you may request that the NRC staff resume its review. At that
time, we will perform our review under new TAC numbers.

If you have any questions regarding this matter, please write or call me at 301-415-1471. pbadupws.nrc.gov

The nrc have docs showing the 50% thinning problem was known about in tubes from these steam gens back in 77 pbadupws.nrc.gov

does this one docs.google.com

Prairie Island docs.google.com

@VesaVA Now that I can believe

Vesa was it you that found the iodine spike in finland? Makes me wonder if the slovenia plant is the cause?

WTF!! they leave relevant events out of the reckoning because they would influence the results?????? OMG
Note that the 2003 blackout event in the safety system actuations graph (Figure 2) and the 2000
steam generator tube rupture event at Indian Point Nuclear Generating Unit 2 in the reactor
coolant system leakage graph (Figure 10) were not included in the short-term data for the
purpose of determining prediction limits. They were excluded from the development of the
prediction limit models because they are considered outlier events that overly influenced the
statistical analysis of the industry-wide data. This treatment results in a more conservative
prediction limit.
www.nrc.gov

nuclearaustralia.blogspot.com the spring / summer of 2003 FirstEnergy, a utility in the US State of Ohio, was supposed to trim trees away from high voltage transmission lines, but failed to do so. In the afternoon of 14-August, demand (or load) began to rise sharply on the electrical grid. The high voltage wires became heated and sagged into the untrimmed trees, initiating a sequence of events that resulted in the shutdown of more than 100 power plants, loss of electrical service for 55 million customers in the US and Canada, and spread so quickly that it took an international investigative panel 6 months to issue a findings report.

@dean yeah money first people last

@VesaVA my unsubstantiated guess is Chernobyl or Slovenia

www.intechopen.com general information on steam generators

sorry, stepped away to get some dinner. Back now

unit 2 is this a bit on the high side?
rature rise, the temperature at the upper head of the bottom
of PCV has risen to approx. 67.2 °C at the highest (as of 4 pm on
February 4, 2012), but currently, it is approx. 65.1°C (as of 5 pm on
February 4, 2012). The trend of the temperature seems to be steady and we
will monitor it continuously.
www.tepco.co.jp
the above link is status at 5pm on the 4th the link below is the status on the morning of the 4th
www.tepco.co.jp