ML19262A990

LER 79-033/01P-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

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: ML19262A986 ML19262A990
References
LER-79-033-01P, LER-79-33-1P, NUDOCS 7912110385
Download: ML19262A990 (2)

Text

NRC FORM 366 U. S. NUCLEAR REGULATORY COMMISSION (7 774 '

- LICENSEE EVENT REPORT LER 79-33/IP (PLEASE PRIN1 OR TYPE ALL RECaulRED INFORM 4 TION)

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l@ Al@ lI l2 10 l7 l@ 47 35 40 42 43 44 CAUSE CESCRIPTION AND CCRRECTIVE ACTICNS 1 3 i The cause of this event is the incorrect desian or acolication of oice succorts to 1 i ii i meet the desien loads recuired bv the olant seismic analvsis. Acorooriate modifi- 1 i  : I cati,,ns to the subject nice sunoort systems vill be performed to insure that the l t 3 I systems meet the recuirements of our seismic analysis. Additional analysis c,f unis i i 4 i occurrence will be orovided in the 14-day recort. J 7 8 9 80 P ACILITY YETHCO CP STATUS  % POWER OTl4ER STATUS OiSCOVERY DISCOVERY DESCRIPTTON i 5 (_y,j h l 0l 9l 6lhl NA l l C l@l Investigation relating to NRC ul.79-14l

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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.

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