ML20028D299

LER 82-153/03L-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

ML20028D299
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-82-153-03L, LER-82-153-3L, NUDOCS 8301170297
Download: ML20028D299 (1)

Text

MRC FORM 366 U. S. NUCLE AR REGULATORY COMMISSION (7 77)

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7 8 60 61 DOCKET NUM8ER 68 69 EVENT DATE EVENT DESCRIPTION AND pro 8ABLE CONSEQUENCES h 10121 lWith the plant in Mode 1 and following 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 l l O i 41 l inoperable. Since the affected steam lead was isolated by closing the control l lO ls! Ivalve on the lead, there was no impact on the health and safety of plant personnel l 0 e lor the public. (See also LER 82-154)

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h IIITl lThe valve was disassembled durina the current outage and insoection revealed I i i lexcessive gallinq between the disc stub shafts and the casing bore. Clearance l l 211 between shaft and bore was increased within drawing tolerances by machining 1 l i , l the stub shafts. I l i l41 1 l' 7 8 9 80 STA S  % POWER OTHER STATUS ISCO RY DISCOVERY DESCRIPTION l' i l 51 LB_J@' l 01 2l 0l@l N/A l l Al@l Operator Observation l ACTiviiv CONTENT REu ASED OPREu ASE tOCAT,0~ OP REuiSE @

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