ML19289D637

LER 78-021/01X-1 on 781128:during Refueling,Local Leak Rate Test Revealed Leakage Through Outer Valves in Penetration 25A & 25B,containment Purge in Excess of Tech Spec Max. Caused by Inadequate Seal at Valve Seats.Adjustment Made

ML19289D637
Person / Time
Site:	Prairie Island
Issue date:	03/07/1979
From:	Hunstad A NORTHERN STATES POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19289D636	List: ML19289D635 ML19289D637
References
LER-78-021-01X, LER-78-21-1X, NUDOCS 7903120217
Download: ML19289D637 (1)

Text

NRC FORM 366 UPDATE REPORT - PREVIOUS REPORT DATE 12/1f/gu LEAR REmAT Rn MSSION LICENSEE EVENT 3EPORT CONTROL BLOCK: l l l l l l (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) i e l0l1l8 9l MIN lP lI lNl2l@l0l0l-l0 l0 l0 0 l0 l~ 0 l0 l@l4 l1LICENSE

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8 68 69 EVENT DATE 74 7b REPORT DATE 80 7 NUMBER EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h l o 12 l l During refueling, local leak rate testing revealed leakage in excess of Tech Spec Io Iai i limits through the outer valves in penetration #25A, Containment Purge Exhaust and l o 4 #25B, Containment Purge Supply. Repetitive. Inner redundant valve in each penetra- l o s l tion was tight. No ef fect on public health and safety. l Io I6 I l _]

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43 44 4; CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i o l Inadequate seal at valve seats. Seats were adjusted and rctests were satisfactory.

i i Surveillance will be increased (on the Unit 2 valves) until confidence is gained. I 11 171 l I

l i 131 l 11 1411 7 8 9 80 ST S  % POWER OTHE R ST ATUS DISCOV RY OtSCOVERY DESCRIPTION s

J @ l0 0l0l@l N/A l lBl@l Local Leakage Rate Test l ACTIVI TY CONTENT RELEASED OF RELE ASE AMOUNT OF ACTIVITY LOCATION 05 RELE ASE i 6 LzJ @ [7J@l N/A l l N/A l 7 E 9 10 11 44 45 80 PERSONNEL EXPOSURES NUY8ER TYPE DE SCRIPTION lil7l"l '010 0l@[z_J@l N/A l

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