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View Diary: Would a little American nuclear emergency make you look up? We're having one (225 comments)

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  •  May 16, 2011 Event Report and July 2010 NRC Report (8+ / 0-)

    May 16, 2011 Event Report

    During identMay 16, 2011 Event Report flood barriers, unsealed through wall penetrations in the outside wall of the intake, auxiliary and chemistry and radiation protection buildings were identified that are below the licensing basis flood elevation.  

    I wonder what that 'licensing basis flood elevation' was established as.

    The OPPD homepage is a bit vague:

    At Fort Calhoun Nuclear Station, OPPD declared a Notification of Unusual Event (NOUE). This is the least-serious of four emergency classifications. OPPD declared a NOUE because the U.S. Army Corps of Engineers projects the Missouri River level will reach 1,004 feet above mean sea level later this week, and is expected to remain at or above that level for more than a month.

    How far above 1,004 feet?
    How much more than one month?

    The penetrations were temporarily sealed and a configuration change was developed and implemented whereby permanent seals were installed. Comprehensive corrective actions to address the root and contributing causes are being addressed through the corrective action program.

    Expected "Submission Date" is listed as August 30, 2011, which would, it appears, be a couple months too late.  

    As a result of a Nuclear Regulatory Commission (NRC) inspection conducted from January 1 to June 21, 2010, the NRC determined that Fort Calhoun Station (FCS) did not have adequate procedures to protect the intake structure and auxiliary building against external flooding events.

    Does this mean that a problem identified almost 2 years ago has not yet been fixed?  

    The following four (4) root causes explain why written procedures were inadequate to mitigate the external flood conditions prescribed by the Updated Safety Analysis Report (USAR). These root causes address the NRC issued yellow finding as well as the specific penetrations being addressed in this LER.

    • Historically, when procedures for flooding protection were restructured or substantially augmented, a weak procedure revision process did not assure FCS met its USAR requirements.

    • Supervisory and management oversight of work activities associated with external flood matters was not sufficient to prevent this issue from occurring.

    • The FCS organization has not been effective in ensuring that performance deficiencies related to external flooding are adequately identified, evaluated, and resolved.

    • Mindsets existed that FCS was “safe as is” relative to external flooding events. These mindsets collectively led to the incorrect conclusion that regulatory requirements were being met.


    Configuration changes were developed as needed and the penetrations sealed. Comprehensive corrective actions to address the root and contributing causes have been developed and will be addressed through the corrective action program. Additional corrective actions will be identified in a revision to this LER.


    The Fort Calhoun Station is required to be protected from flooding within the station’s licensing basis. The safety related equipment required to mitigate the consequences of an accident were affected by these findings. The openings could have jeopardized the ability of the safety related equipment to perform their design basis function during an accident. Other methods of removing decay heat and mitigating the consequences of a flooding event were available. Therefore, this external flooding concern has substantial importance to safety as indicated by the Yellow Finding issued for this event.

    The original 2010 inspection report appears here.

    We'd rather dream the American Dream than fight to live it or to give it to our kids. What a shame. What an awful, awful shame.

    by Into The Woods on Mon Jun 06, 2011 at 07:53:46 PM PDT

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