ML20028D303

LER 82-154/03L-0:on 821130,following Turbine Trip,Low Pressure Turbine Stop Valve 2UV-2200R Failed to Close.Caused by Excessive Galling Between Disc Stub Shafts & Casing Bore. Clearance Between Shaft & Bore Increased

ML20028D303
Person / Time
Site:	San Onofre
Issue date:	12/29/1982
From:	Ray H SOUTHERN CALIFORNIA EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
Shared Package
ML20028D290	List: ML20028D289 ML20028D299 ML20028D303
References
LER-82-154-03L, LER-82-154-3L, NUDOCS 8301170303
Download: ML20028D303 (1)

Text

NRC FORM 366 U. S. NUCLEAR REGULATORY COMMISSION (7 771 LICENSEE EVENT REPORT CONTROL BLOCK: l 1

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(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) lo l1l8 9l c l ALICENSEE 7

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7 8 61 NUM8ER EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h 10121 IWith the plant in Mode 1 and followino a turbine trip. low pressure turbine stop valvel o 3 l2VV-2200R located on Low Pressure Turbine #2 failed to close fully and was declared  ;

in i4; l inoperable. Since the affected steam lead was isolated by closing the control l IO l s t Ivalve on the lead, there was no impact on the health and safety of plant personnel g i O is I lor the public. (See also LER 82-153). l i

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44 47 JJ 34 36 31 40 43 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h li i o l lThe valve was disassembled during the current outage and inspection revealed i i i l excessive galling between the disc stub shafts and the casing bore. Clearance l

, , lbetween shaf t and bore was increased within drawing tolerances by machining i l

ii 13 l l the stub shaf ts.

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