ML20028D033

LER 82-040/03L-0:on 821122,during Mode 2 Operation,Control Element Assembly Calculator 2 Failed.Caused Undetermined. Calculator Reinitialized & Returned to Svc

ML20028D033
Person / Time
Site:	Arkansas Nuclear
Issue date:	12/22/1982
From:	Rogers P ARKANSAS POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20028D029	List: ML20028D028 ML20028D033
References
LER-82-040-03L, LER-82-40-3L, NUDOCS 8301140420
Download: ML20028D033 (1)

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NRC FORM 366 U.S. L"JCLEAR REGULATORY ComISSION (7-77)

LICENSEE EVENT REPORT EXHIBIT A CONTROL BLOCK: l (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1__,l _ l _ l _ l _ l _ 611 8 E 'l 1 E 2 Tb 57-dTd 11'11 sfan !A !A'1'-8ds'414'A'4!' !A'4MT'4! * '41' !A'4!&Hib'4!'

EVENT DESCRIPTION AND PROBABLY CONSEQUENCES 10 11lT_t _

10n 11/22/82 while in Mode 2, control element assembly calculator (CEAC) #2 failed. CEA position readinas were l.

,l111l ~ -ltaken every 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />, and the core protection calculators (CPC) were placed in CEAC (2 INOP as required by 1-11lTI l action 5 of T. S. Table 3.3-1. CEAC #1 was operable. CPC 'C' also failed at this time but the other 3 l l1l11 l channels' remained operable. Only 3 CPC channels are required to be operable per T. S. 3.3.1.1. This occur # l l1lIl lrence is reportable per T. S. 6.9.1.9.b. Similar occurrences were reported in LER's82-009, 81-010,80-058, l l111l land 80-053. Other occurrences identifying CEAC failures were reported in LER's82-027, 82-005,80-080, 79-073,1 7

l11118 9 l79-013,79-004, 78-025, and 78-020. I 80 SYSTEM CAUSE CAUSE COMP VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE I _1 l 11 112 113 l_N_,j_$_lll_R_I 14 115 116 SEQUENTIAL OCCURRENCE REPORT REVISION LER/RD f'EVENTYEAR REPORT NO. CODE TYPE NO R l_ 2 ACTION FUTURE EFFECT SHUTDOWN ATTACHMENT NPRD-4 PRIME COMP. COMPONENT TAKEN ACTION ON PLANT METHOD HOURS SUBMITTED FORM SUB SUPPLIER MANUFACTURER-118 119 120 l21 0_l 0_l 1 1 22 123 124 125 l_4_L9 ,1 26 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 27 l1111 lNo specific cause could be determined. The cause possibly could be related to a lightning storm in progress l l1111 lat the time of the occurrence. CEAC #2 and CPC 'C' receive power from the same source. Software and hardware l l1l1l Idiagnostics revealed no indication of the cause of the failure. CEAC 82 and CPC 'C' were re-initialfred and l l111l lthe periodic surveillances were performed to verify proper operation. After proving operability, CEAC #2 and l

, 111118 9 lCPC 'C' were returned to service. l 7 80 FACILITY METHOD OF STATUS  % POWER OTHER STATUS DISCOVERY DISCOVERY DESCRIPTION 1111l8 7 9 1,,C_l28 10 15~(0_l72 1 129 l 13 NA 44 l30 l A 131 l 4I 46 Operator Observation 132 80 ACTIVITY CONTENT RELEASED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE 111118 l 9 Z,._l33 lZ 15"-l34 l

11 NA l35 i 44 NA l36 7 45 80 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION l 11_0_l 37 138 NA 39 PERSONNEL INJURIES l NUMBER 6CRIPTION l11118 9l1l_0_l71 7

0 140 i 12 NA l41 80 '

LOSS OF OR DAMAGE TO FACILITY TYPE DESCRIPTION lllll l Z._l42 l NA 143 ,

5 PUBLICITY B301140420 pDR ADOCK 821222 ISSUED DESCRIPTION g 05000360 NRC USE ONLY .,

NA PDR l _N_l44 j45 gl_LLLLLl_LLLig

'NAME OF PREPARER Patrick Rogers PHONE: (501) 964-3100