ML20028B774

LER 82-043/03L-0:on 821102,broken 1 1/4-inch Hydraulic Snubber Stud Discovered & Traced to Hanger 490001 on One Main Steam Lead to High Pressure Turbine.Caused by Constant High Vibration & Increased Loads During Plant Trips

ML20028B774
Person / Time
Site:	Millstone
Issue date:	11/24/1982
From:	Stadnick S NORTHEAST NUCLEAR ENERGY CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20028B771	List: ML20028B770 ML20028B774
References
LER-82-043-03L, NUDOCS 8212030234
Download: ML20028B774 (1)

Text

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EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h O 2 lDuring pcwer ascension, a broken hydraulic cntthher stud (1 1/d ineh diameter) wac l

,, g 3 ; ; discovered and traced to hanger 490001 on a main steam lead to the_hich_pr, essure I

Oi l l turbine. The plant complied with Technical Specification 3.7.8.1 and wac in this I o 3 l action statement for 30-3/4 hours while repairs were made. Similar event 80-11 1 O s l(4/11/80). I r

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43 li44 12 10 l 71@47 CAUSE DESCRIPTION AND COR9ECTIVE ACTIONE ji lC ) } The stud failed due to constant high~ vibration and increased loads during plant trios. I gl loc stud was replaced end the snuboer was functionally tested. Adiacent snubber studs i=

g ,,,i were visually inspected. The pipe hanger has been redesigned and modifications will bel

,,,3,  ; done during the 1983 Retae' Outage to prevent recurrence. l ITTTl i 80 I

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