ML20147A712

/03L on 780817:During Normal Oper,Feedwater Flow Meter Increased Suddenly in Indication,Resulting in a Loss of One Channel of the Steam Flow/Feedflow Mismatch Trip. Caused by Disloged Flow Straightener. (Encl to 7809080050)

ML20147A712
Person / Time
Site:	San Onofre
Issue date:	08/29/1978
From:	SOUTHERN CALIFORNIA EDISON CO.
To:
References
LER-78-009-03L, LER-78-9-3L, NUDOCS 7809080052
Download: ML20147A712 (1)

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41 0 EVENT DESCRIPTION AND PRODABLE CONSEQUENCES h in i2i l -During normal plant operation the "B" feedwater flow meter exhibited a sudden I io ni i increase in indication resulting in a loss of one channel of the steam flow / l ic i4 l l feedflow mismatch trip. Continuous operator surveillance was initiated in l iol3i i accorg nce with T.S. 3.5 Table 3.5.1. l 0 6 l J

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h lilolI X-Rays of the feedwater piping indicate that the flow straightener became j li l'i l 1 dislodged from its normal location and moved downstream where it became lodaed I i,,7j l against the feedwater flow orifice plate. I riTO I J l

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80 ST .  % POWE R OTHER STATUS DISC HY DISCOVC HY DESCRtP TION NA Operator observation l I1 Ib 1 l E l@ l0 l 9 l 3 l@l l l Al@l A TlVITY CL 1ENT AMOUNT OF ACTIVITY LOCATION OF HELE ASE i 6 RE l ZlLE ASE D@OF RILE ASE(J.J@[ NA l l NA B0 l

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