ML19289G226

LER 79-054/03L-0 on 790716:main Feedwater Valve a Failed Shut.Caused by Frozen Inboard Bearing on Valve Operator Motor.Bearing Replaced,Motor Reinstalled & Valve stroke-tested Satisfactorily.Valve Declared Operable

ML19289G226
Person / Time
Site:	Arkansas Nuclear
Issue date:	08/02/1979
From:	Shively C ARKANSAS POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19289G224	List: ML19289G223 ML19289G225 ML19289G226 ML19289G227 ML19289G228 ML19289G229
References
LER-79-054-03L, LER-79-54-3L, NUDOCS 7908070576
Download: ML19289G226 (1)

Text

2 NRC FORM 366 (7 77) U. S. NUCLE AR REGULATORY COMMISSION LICENSEE EVENT REPORT EXHIBIT A CONTROL 8 LOCK:

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60 61 DOCEET NUMeEn ha 69 74 EVENT DATE 76 HEPOHf D ATE EVENT DESCRIPTION ANO PROBADLE CONSEQUENCES h lo 121 1 Durine Mode 1 operation. th e "A" Ma i n Feedwn t er regn 1 n tnr va l ve fn i l ed i 1013] Ishut. reauirine Emergency Feedwater. EFW finw contrn1 valve. 2CV-in75.

O a Ifailed to open upon receipt of the EFA9 signal _ resniting in nn finw tn l c 5

l. Steam G en evn t nr R frnm FFW nunn ?P7R F1nw wn e netnbliched fynm FFW I I O 161 pump 2P7A. This occurrence is similar to LER 50-368/79-028. I IO IIi 1 Reportable per T.S. 6.9.1.9b. I O e l 7 8 0  !

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O I Investigation revealed that the inboard bearing on the valve operator i iiiii motor had fro::en. The bearing was replaced, motor reinstalled and the lil2l l Valve was strnko tected en ti ef n e tnri l y. The vn1ve wnc doc 19rnd nnevnblol 1 13l l Within 25 hours2.893519e-4 days <br />0.00694 hours <br />4.133598e-5 weeks <br />9.5125e-6 months <br /> of the failure detection. meetine Action Statement i L'_J *J l T.S. 3.7.1.2 7 8 9 i STA 5  % POvwfR OTHE e41T ATUS O SC v HV OtSCOVE HY DESCHIP flON IJ_LJ LaJ@ In I s o l@ lown verni

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8d issue D DE5CpePTION 45 NRC USE ONLY 2 O 7 8 9 LN.J8L to NA 1  ; l [g;;;;;[l NAME OF PREPARER Chris N. Shively

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