ML19339A594

LER 80-033/01T-0:on 801014,ultrasonic Insp Per IE Bulletin 80-7 Revealed Crack in Jet Pump 8 Holddown Beam at Mean Diameter of Bolt Thread.Caused by Intergranular Stress Corrosion.Beam Replaced W/One of Higher Strength

ML19339A594
Person / Time
Site:	Vermont Yankee
Issue date:	10/28/1980
From:	Murphy W VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19339A591	List: ML19339A590 ML19339A594
References
IEB-80-07, IEB-80-7, LER-80-033-01T, LER-80-33-1T, NUDOCS 8011040381
Download: ML19339A594 (1)

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386 U. S. NUCLEAR REGULATORY COMMisslON (7 "7 LICENSEE EVENT REPORT LER 80-33/lT l

, CONTROL 8 LOCK: l l l l l l (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) a foTil8 I9 v i TUCENSEE 7

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i St 68 EVENT DESCRIPTION AND PROSABLE CONSEQUENCES h j lo I2l l U.T. examination (in accordance with NRC Bulletin 80-7 and approved inservice inspec- l l lTTT1 l tion procedure) revealed a crack in the #8 jet pump hold-down beam at the mean dia- l l

l014IImeter of the bolt thread. .-The crack had not led to failure of the hold-down beam. l l 0 l s t l There were no adverse conac c ences to public health and safety. i l

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7 8 9 to 11 12 13 18 19 20

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42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h I i l o 1 l Tha mcst orobable cause of the #8 hold-down beam crack, was intergranular stress cor- I l

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W lrosion. U. T. inspect 10n of the other 19 hold-down beams showed no indications. The I i1 12i l #8 hold-down beam (BWR 3 design) was replaced with a higher strength hold-dc,m beam I ,

Iilal l (BWR 4 design). l  !

11 141 I l 7 8 9 80

$  % POWER oTHER STATUS OIS RY Of SCOVERY DESCRIPT1oM

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• l 12iolLy_181 8 0110 4- 0 9/ NA i 1. i i i i i i i i i i i l i 7 8 9 10 68 69 80 3 NAME OF PREPARER Warren P. Murphy PHONE:

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