05000271/LER-1980-033-01, /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

/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 File:NorthStar Vermont Yankee icon.png
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: 05000271/LER-1980-033, Forwards LER 80-033/01T-0 05000271/LER-1980-033-01, /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
References
IEB-80-07, IEB-80-7, LER-80-033-01T, LER-80-33-1T, NUDOCS 8011040381
Download: ML19339A594 (1)

LER-1980-033, /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

Event date:
Report date:
2711980033R01 - NRC Website

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NIE 386 U. S. NUCLEAR REGULATORY COMMisslON (7 7 LICENSEE EVENT REPORT LER 80-33/lT CONTROL 8 LOCK: l l

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60 St DOCKET NUM8ER 68 80 EVENT DATE 74 75 REPORT DATE 80 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 lTTT1 l tion procedure) revealed a crack in the #8 jet pump hold-down beam at the mean dia-l The crack had not led to failure of the hold-down beam.

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l014IImeter of the bolt thread..-

l 0 l s t l There were no adverse conac c ences to public health and safety.

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OCE SUSCO E COMPONENT CODE SUS ODE SU E

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9 to 11 12 13 18 19 20 SEQUENTIAL OCCUR R ENCE REPORT REvtsiON gg 40 EVENT YEAR REPORY NO.

COOE TYPE No.

h y(ugg l21 8l 01 l-l l 0 13 l 3 l l/l l0l1l lTl l-l l 0l as 22 23 24 26 27 28 29 30 38 32 l

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33 34 35 38 31 40 41 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.

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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).

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7 8 9 80

% POWER oTHER STATUS OIS RY Of SCOVERY DESCRIPT1oM I i i s l l Hl@ l 0 l 0 l 0 l@l NA l

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l AbvlTY CO TENT l i i s t L_z1 @D CF RELEASEIzl@l RELEASE AMoyNT OF ACTIVITY LOCATION OF RELEASE NA I

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,ERso~NEL%uks NUM8ER DESCR* TION fiTa1 101 0l Ol@l NA l

7 8 9 11 12 80 LOSS OF OR DAMACE To FACILITY Q TYPE

DESCRIPTION

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7 8 9 to 30 tssyg DE CRIPTION 12iolLy_181 8 0110 4- 0 9/ NA i

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7 8 9 10 68 69 80 3 Warren P. Murphy

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