05000271/LER-1979-033-01, /01P-0:on 791205,seismic Analyses Revealed That Pipe Supports in Five Sys May Be Inadequate to Support Seismic Loads.Caused by Incorrect Design or Application of Pipe Supports.Appropriate Mods to Sys Will Be Performed

/01P-0:on 791205,seismic Analyses Revealed That Pipe Supports in Five Sys May Be Inadequate to Support Seismic Loads.Caused by Incorrect Design or Application of Pipe Supports.Appropriate Mods to Sys Will Be Performed

ML19262A990
Person / Time
Site:	Vermont Yankee File:NorthStar Vermont Yankee icon.png
Issue date:	12/06/1979
From:	Conway W VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19262A987	List: 05000271/LER-1979-033, Forwards LER 79-033/01P-0 05000271/LER-1979-033-01, /01P-0:on 791205,seismic Analyses Revealed That Pipe Supports in Five Sys May Be Inadequate to Support Seismic Loads.Caused by Incorrect Design or Application of Pipe Supports.Appropriate Mods to Sys Will Be Performed
References
LER-79-033-01P, LER-79-33-1P, NUDOCS 7912110385
Download: ML19262A990 (2)

LER-1979-033, /01P-0:on 791205,seismic Analyses Revealed That Pipe Supports in Five Sys May Be Inadequate to Support Seismic Loads.Caused by Incorrect Design or Application of Pipe Supports.Appropriate Mods to Sys Will Be Performed

Event date:
Report date:
2711979033R01 - NRC Website

text

NRC FORM 366 U. S. NUCLEAR REGULATORY COMMISSION (7 774 LICENSEE EVENT REPORT LER 79-33/IP CONTROL BLOCK: l l

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NAME OF P4EPARER

'J. F. Conwav 7%CNE:

VTVYS1 05000271 LER 79-33/lP EVENT DESCRIPTION AND PROBABLE CONSEOUENCES During the seismic analyses to determine the adequacy of all Seismic Class I pipe supports, as required by an NRC letter from Mr. Boyce H. Grier to Mr. Robert H. Groce dated October 24, 1979, and NRC Bulletin 79-14, it was diecovered that pipe supports in five systems may be inadequate to support their seismic loads. In accordance with this letter, all modifi-cations required by this occurrence will be completed within seven days or the plant will be brought to a cold shutdown condition.

Engineering eval-uations associated with the identified supports have determined that system components are not considered inoperable.

There have been no previous analytical failures of any pipe supports reported to the Commission.

1529 129