05000313/LER-1981-005-03, 0707 & 0806,steam Driven Emergency Feedwater Pump P7A,stated & Tripped by Turbine Overspeed Trip Mechanism.Caused by Condensation Build Up & Mechanical Vibration.Latch Mechanism Replaced

0707 & 0806,steam Driven Emergency Feedwater Pump P7A,stated & Tripped by Turbine Overspeed Trip Mechanism.Caused by Condensation Build Up & Mechanical Vibration.Latch Mechanism Replaced

ML20010H815
Person / Time
Site:	Arkansas Nuclear
Issue date:	09/09/1981
From:	Shively C ARKANSAS POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20010H799	List:
References
LER-81-005-03X, LER-81-5-3X, NUDOCS 8109290318
Download: ML20010H815 (1)

LER-1981-005, 0707 & 0806,steam Driven Emergency Feedwater Pump P7A,stated & Tripped by Turbine Overspeed Trip Mechanism.Caused by Condensation Build Up & Mechanical Vibration.Latch Mechanism Replaced

Event date:
Report date:
3131981005R03 - NRC Website

text

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UPDATE REPORT - PREVIOUS REPORT DATE 8/13/81 NRC FF)Ree 364 U. S. NUCtE AR REGULATORY COAAJlsser.6 (7 77)

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LVENTDATE l4 FS HE,OHf Dart 80 EVENT DESCRIPTION ANO PROBABLE CONSEQUENCES O'o g i n 4/8/81 following a plant trip,on 7/7/81 following an inadvertent i

O m.. i actuation signal and on 8/6/81 during a surveillance test, the steam driven E Iomorgency foodwater cump. P7A. started and was subsequently tripped by I

o s i the turbine overspeed trip mechanism.

In all cases, the electric driven i LEEif. numn romained nnprahla. The trin mechanism was reset. the oumo I

o a g i ested and returned to service. Similar to LER 50-313/80-021.

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! Followina the 4/8/81 event. the mechanism for initiating the nversnood I

i o EI trip was adjusted to latch more firmlv.

The 7/7/81 event indicated 1

,, i the latch mechanism required replacement. Mechanical vibration caused i

i i i bv condensation buildun in the steam sucolv line is believed to be i

i. I the root cause of the 8/6/81 trip. Ev.aluation of the problem is con-a,$,,,,$i nui ng. Selected mechanism pg,gj)re being procured for replacement.

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