05000368/LER-1982-040-03, /03L-0:on 821122,during Mode 2 Operation,Control Element Assembly Calculator 2 Failed.Caused Undetermined. Calculator Reinitialized & Returned to Svc

/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: 05000368/LER-1982-040, Forwards LER 82-040/03L-0 05000368/LER-1982-040-03, /03L-0:on 821122,during Mode 2 Operation,Control Element Assembly Calculator 2 Failed.Caused Undetermined. Calculator Reinitialized & Returned to Svc
References
LER-82-040-03L, LER-82-40-3L, NUDOCS 8301140420
Download: ML20028D033 (1)

LER-1982-040, /03L-0:on 821122,during Mode 2 Operation,Control Element Assembly Calculator 2 Failed.Caused Undetermined. Calculator Reinitialized & Returned to Svc

Event date:
Report date:
3681982040R03 - NRC Website

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

LICENSEE EVENT REPORT EXHIBIT A l

11 (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

CONTROL BLOCK: 1__,l _ l _ l _ l _ l _ 6 Tb 57-dTd 8

E

'l 1

E 2

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 l1111 l79-013,79-004, 78-025, and 78-020.

I 7

8 9 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 11111 lCPC 'C' were returned to service.

l 7

8 9 80 FACILITY METHOD OF STATUS

% POWER OTHER STATUS DISCOVERY DISCOVERY DESCRIPTION 1111l 1,,C_l28 15~(0_l72 10 1 129 l NA l30 l A 131 l Operator Observation 132 13 44 4I 46 80 7

8 9 ACTIVITY CONTENT RELEASED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE 11111 9 Z,._l33 15"-l34 l

lZ l

NA l35 i NA l36 7

8 11 44 45 80 PERSONNEL EXPOSURES NUMBER TYPE

DESCRIPTION

l 11_0_l 37 138 NA 39 PERSONNEL INJURIES l

NUMBER 6CRIPTION l1111 l1l_0_l71 0 140 i NA l41 7

8 9

12 80 LOSS OF OR DAMAGE TO FACILITY TYPE

DESCRIPTION

lllll l Z._l42 l NA 143 B301140420 821222 5

PUBLICITY pDR ADOCK 05000360 NRC USE ONLY ISSUED DESCRIPTION g

l

_N_l44 NA PDR j45 gl_LLLLLl_LLLig

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