ML20028E379

LER 82-046/03L-0:on 821211,while Starting Cooldown in Mode 3,main Feedwater Isolation Valve Failed to Operate. Caused by Insufficient Clutch Spring Force.Damaged Internal Components Replaced & Tested

ML20028E379
Person / Time
Site:	Arkansas Nuclear
Issue date:	01/11/1983
From:	Moeggenberg D ARKANSAS POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20028E376	List: ML20028E375 ML20028E379
References
LER-82-046-03L, LER-82-46-3L, NUDOCS 8301210277
Download: ML20028E379 (1)

Text

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NRC FORM 366 -

U.S. NUCLEAR REGULATORY COMMISSION (7-77)

LICENSEE EVENT REPORT EXHIBIT A CONTROL BLOCK: l_i_l_l_i_l_l1 (DLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 6 3 IT 111 R l A l N I O 12 l2 10 l 15 7--~I ~T 8 9l

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UCEATEFTODT 74 15 101 - lTCEN5E WUMEEli01010 ~ 75 l 0101 23 UfENSE - l~010 TWE70 l3 141111111114 57 TAT 58l 10 1l L 16 10l510l0l013 2 l 1 l 1 I 81218 iO 8 1 3 19 7-l~8 REPORT lD 6I- --- D'6CKET NUMBEll-l_6_l SOURCE 6 68 698 17 1 1 l 7 VENT UATEA-- 75-~I~1 74 liERiliT 1 1liAT l 1 l I ~ 60 EVENT DESCRIPTION AND PROBABLY CONSEQUENCES 10 '

l1l11 10n 12/11/82, while starting cooldown with the unit in Mode 3, it was found that main feedwater isolation valve !

l1111 l2CV-1024 for steam generator ' A' failed to operate. Redundant valve 2CV-1023-1 was available and operable. l lTlIl lThis is reportable per T.S. 6.9.1.9.(b). Similar occurrences regarding this valve operator were reported via l 11l11 lLER 82-014 and 82-021. l 11111 l 1 lIlli i i 111118 9 l I 7 60 SYSTEM CAUSE CAUSE COMP VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE 111118 l_C,_I H 111 lE 11 112 l _B_,113 IV l A 115 l Z_,116 3 IT -l_A_l_L_l_V_l 0_l~P 114 7 9 10 12 18 1F 20

- SEQUENTIAL OCCURRENCE REPORT REVISivN LER/R0 l EVENT YEAR REPORT NO. CODE TYPE NO 17 REPORT l l8 2I l--- l0 4 l/ l0l3l lL l--- l0i NUMBER l_21 -l 7 2 23-l 2Fl 16l76 2Fl 2F 79 3D-l 31--l 3F ACTION FUTURE EFFECT SHUTDOWN ATTACHMENT NPRD-4 PRIME CCMP. COMPONENT TAKEN ACTION ON PLANT METHOD HOURS SUBMITTED FORM SUB SUPPLIER MANUFACTURER lA i X l19 lZ lZ l010 lN 1Y lA iL 3T 118 3F 35- 120 38- 121 3F --l_0._l 040l22 4I - [23 4F-l24 4T 125 ,

4T'-l_2_l_0_l --47 0 126 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 27 1111l lThe cause of this occurrence appears to be insufficient clutch co3pression spring force which caused partial l l1l1l l engagement of gears in the valve operator and resulted in mechanical damage to various internal comoonents. I 11l1l lImmediate corrective action was to replace damaged parts. After reassembly, the valve was satisfactorily l 11l1l l tested. A request for an engineering evaluation has been initiated to determine long term corrective action. l 11111 l l 7 8 9 80 FACILITY METHOD OF STATUS  % POWER OTHER STATUS DISCOVERY DISCOVERY DESCRIPTION lTl I C 128 101,0_I 0 129 l NA 130 l A 131 i Operational Event 7~ Il8 9

ACTIVITY CONTENT ID-- 72 13 44 45-- 46 80 132 RELEASED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE IT IZ l Z 134 I NA l35 i NA 136 7~l118 9~l 33 10 - 11 44 45 80 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION 111118 7 9 l_0_l 0_l_0_l37 I Z l38 l 11 IF 13 t'A 80 139 PERSONNEL INJURIES NUMBER DESCRIPTION l 0 1 0 1 0 140 l NA l41 7~lTI IT ~-8 9~ ~ Il 12 8301210277 830117 80 LOSS OF OR DAMAGE TO FACILITY TYPE DESCRIPTION PDR ADOCK 05000368 ITill l Z_l42

_ i NA $ ja3 PUBLICITY ISSUED DESCRIPTION NRC USE CNLY lll_T_I8 7 9 l N_l44 l 10 NA 68 145 l_i_i_I_l_i_i_l_1_l _l _l_I 69 80 NAttE OF FREPARER D. E. Moencenberg PHONE: (501) 964-3100 i

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