ML20027D503

Updated LER 82-016/01T-1:on 821009,during Inservice Insp, Indication Found at 12 O'Clock Location on Recirculation safe-end to Pipe Weld E & at 3 O'Clock Location on 821020. Caused by Intergranular Stress Corrosion Cracking

ML20027D503
Person / Time
Site:	Monticello
Issue date:	10/09/1982
From:	Hammer S NORTHERN STATES POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20027D500	List: ML20027D499 ML20027D503
References
LER-82-016-01T, LER-82-16-1T, NUDOCS 8211040390
Download: ML20027D503 (1)

Text

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61 CD:s E T r..veie ei 69 E.ENT C ATE 24 15 pie;4T OA E 4; EV ENT DES:P:P? CN AN: *EOS AELE C*NSEO: EN:Es h Io : e i On 10/9/82 during augmented ISI an indication was found at 12 o' clock location i n i.i i on E recirc safe end to pipe weld. On 10/20/82 during preparation for repair i Ia ia i l of this weld a through wall defect was found at the 3 o' clock location. This 1 I

i e i n I is an abnomal decradation of the reactor coolant pressure boundary I ie e i I (T.S. 6. 7.B.1.c) . On 9/28/82 an 11 per cent thru wall indication was found i Iei>I I on the A 22 inch end cap. No effect on public health and safety. Previous i io,sii similar event A0-75-03.

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l ,: ii Probable cause is IGSCC. Weld overlay was made to the 22 inch end cap. Similar  ;

i:. ii repair planned for E safe end indication. Small indications were found on C i i, , , I and F riser safe end to oice welds and D riser elbow. These small indications  ;

ii.: i ! will be analyzed to iustify continued operation. All material is 304 SS. I li; ! I Final report will be submitted.  !

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