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

From kanterella
Revision as of 22:34, 3 January 2025 by StriderTol (talk | contribs) (StriderTol Bot insert)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to navigation Jump to search
/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

,

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

8,

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

" "J IL l@l0 l 5 p l010 l31618 l@l1 i P lo 1117 lo l@ 1 l P l? I 117 l o l@

o i

7 8

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/

I o

o

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

CCOE tcCE sueCODE (0uroNENT Latit

%v..k 5.>isCC:.)E t,o L_]

,I W I Bl @ [E_.]@ L,,BJ G,I VI A ll I V l 0 l P l@

'O., @ [20_Zl @

m 3

i gg g IVINT'E*"

"EPO T'

C DE

'k

@,agg,8eo17 19I l _J 10 l o I'O71 (f_.J l nh I L,LJ 1, -J L,.JLI

_a, n

23 u

v n

r, 3

, A ut N A

DN 8LA 47 MET

++ OU R s s8 iT FOA s e suPPLi vAs sa SER l_Aj@LZJ@

LZ_J@

I.7_J@

..o l oloI ol LB.J@

LJJ@

LUJ@

lWI11217l@

l 33 34 32 36 J*

40 81 41 43 as 4;

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.

i

'57 A s

'L POWE A CTME d sT ATUs sCb Hv

"iN. t h v C E LCH'P riON lits![fj@

010 121@l NA l

[A.J@l NA l

'2 A?,,,,,,

cdar,~T 7

.Ov~T cr AcT~,r. @ l a

46

.3 tocm,cso,,,,,c,@

arte Asso or astem A

L2_j @ [Z_J @ l NA l

NA l

i c

',~ so~s'a t e,,cs " isme.,,,,e, @

,E -

T,,,

L'.D.J 10101 Ol@lZ_J@l NA

..so se't.~;u'les sa ersca,T,cN@

~uviEn 1010l0 l@l NA.

i w o =.e,I; r ~ @

1656 124 Lz_J@l NA i

o

.u.t.g,.

otsc.,,T,os @

~ac est om

,5su.o L2Lo_JLE.J@l NA 1 ; i i; ;;;;;i,il 7

NAME OF PREPARER p..O*i E.

7912310

Retrieved from "https://kanterella.com/w/index.php?title=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&oldid=4873621"