05000368/LER-1979-092-03, /03L-0:on 791201,during Mode 2 Operation,Emergency Feedwater Flow Control Valve 2CV-1025-1 Failed to Close on Demand from Control Room.Caused by Lack of Hydraulic Pressure Due to Low Fluid Level in Accumulator

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/03L-0:on 791201,during Mode 2 Operation,Emergency Feedwater Flow Control Valve 2CV-1025-1 Failed to Close on Demand from Control Room.Caused by Lack of Hydraulic Pressure Due to Low Fluid Level in Accumulator
ML19256G505
Person / Time
Site: Arkansas Nuclear Entergy icon.png
Issue date: 12/21/1979
From: Shively C
ARKANSAS POWER & LIGHT CO.
To:
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19256G491 List:
References
LER-79-092-03L, LER-79-92-3L, NUDOCS 7912310409
Download: ML19256G505 (1)
v • d • e


LER-1979-092, /03L-0:on 791201,during Mode 2 Operation,Emergency Feedwater Flow Control Valve 2CV-1025-1 Failed to Close on Demand from Control Room.Caused by Lack of Hydraulic Pressure Due to Low Fluid Level in Accumulator
Event date:
Report date:
3681979092R03 - NRC Website
v • d • e

text

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NRC TORM 366 U. S. NUCL E AR REGUL ATORY CoeduissiON (7 77) 1.lCENSEE EVENT REPORT EXHIBIT A CONTROLBLOCK l l l l l l lh (PLE ASE PRINT OR TYPE ALL REQUtRED INFORMATIONI l AlR l A l Nl 0 ] p lgl 0 l0 l -l0 l 0 l 0l Og 0 l-l 0 l0 lg4 l1 l 1 l1 l 1 lgl l lg o i 7

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LICENsti CODE to 16 license NuveEse 26 20 Lec t N>E ivri Jo 67 C A T se CON'T

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60 6-DOCsLET NUMgE m 68 69 EVENT DATE 74 76 NFPORf DATE 80

- EVENT DESCRIPilON AND PROBASLE CONSEQUENCES h f5T211 Durino Mode 2 operation. with the electric driven Emer9ency Feedwater i

10 i 3 i i pump, 2P7B, in service as an auxiliary feedwater pump for normal startup o a i Steam Generator feed. EFW flow control valve. 2CV-1025-1. failed to closel e s I on demand from the Control Room.

The valve failed in the EFW, or safe.

I lo is i l position.

All redundant EFW valves were successfully stroked from the i

IolilI Control Room.

This occurrence is similar to LER 50-368/79-090. 79-0E9.

I i 79,088 and 79-043. Other LER's involvina valve 2CV-1025-1 are 50-36E/

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'79-068, 7,9a054, L9-p51,c29,-035,78-028 and 78-009.Semrtablg, per T.S.6.911.9.b.

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C AUSE DESCRepTION AND CORRECflVE ACTIONS h i

o l Investication revealed that the valve failed to operate due to the lack of li t i l hydraulic pressure caused by a low fluid level in the hydraulic accu ula-i 1 tor because of leakaae.

The accumulator was replaced and the system was i 2

,i3 I filled and vented. The valve was declared operable within 19 hours2.199074e-4 days <br />0.00528 hours <br />3.141534e-5 weeks <br />7.2295e-6 months <br />, t

Lu.] I meetina the reouirements of Action Statement T.S. 3.7.1.2.

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NAME OF PREPARER p..O*i E.

7912310

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