05000271/LER-1979-034-01, /01P-0:on 791211,during Seismic Analyses of Seismic Class 1 Pipe Supports,Discovered That Pipe Supports in Portion of Two Sys May Not Support Seismic Loads.Caused by Incorrect Design or Application of Supports

/01P-0:on 791211,during Seismic Analyses of Seismic Class 1 Pipe Supports,Discovered That Pipe Supports in Portion of Two Sys May Not Support Seismic Loads.Caused by Incorrect Design or Application of Supports

ML19256F318
Person / Time
Site:	Vermont Yankee File:NorthStar Vermont Yankee icon.png
Issue date:	12/12/1979
From:	Conway W VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19256F316	List: 05000271/LER-1979-034, Forwards LER 79-034/01P-0 05000271/LER-1979-034-01, /01P-0:on 791211,during Seismic Analyses of Seismic Class 1 Pipe Supports,Discovered That Pipe Supports in Portion of Two Sys May Not Support Seismic Loads.Caused by Incorrect Design or Application of Supports
References
LER-79-034-01P, LER-79-34-1P, NUDOCS 7912180489
Download: ML19256F318 (2)

LER-1979-034, /01P-0:on 791211,during Seismic Analyses of Seismic Class 1 Pipe Supports,Discovered That Pipe Supports in Portion of Two Sys May Not Support Seismic Loads.Caused by Incorrect Design or Application of Supports

Event date:
Report date:
2711979034R01 - NRC Website

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NAME OF PREPARER 7912180

s VTVYS1 05000271 LER 79-34/1P EVENT DESCRIPTION AND PROBABLE CONSEQUENCES During the continuing 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 discovered that pipe supports in a portion of two systems may be inadequate to support their seismic loads.

In conjunction with those identified in RO 79-33/IP, the total number of systems affected is six. In accordance with this letter, all modifications required by this occurrence will be completed within seven days or the plant will be brought to a cold shutdown condition.

Engineering evaluations associated with the identified supports have determined that system components are not considered inoperable. Previous analytical failures of pipe supports were rr orted to the Consission as RO 79-33/lP.

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