ML19211D106

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LER 79-046/03L-0:on 791214,plant Computer Taken Out of Svc for Corrective Maint,Rendering Incore Detector Sys Inoperable.Caused by Computer Rapid Access Disc Counter Incrementing Improperly,Forcing Computer to Stop
ML19211D106
Person / Time
Site: Calvert Cliffs Constellation icon.png
Issue date: 01/10/1980
From: Lagiewski J, Rizzo P
BALTIMORE GAS & ELECTRIC CO.
To:
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19211D105 List:
References
LER-79-046-03L-01, LER-79-46-3L-1, NUDOCS 8001160372
Download: ML19211D106 (2)


Text

NRC FORM 366

v. s. mvvLean ntuuta a un v cvememum (7 77)LICENSEE EVENT REPORT

.CONTROL BLOCK: l llllllh (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 6 R lM ID lc lC lN l2 l @l Ol Ol -l 01 01 0 Ol01-l01Ol@l4111111Ill@l I l@7 8 9 LICENSEE CODE 14 15 LICENSE NUMsER 25 26 LICENSE TYPE JQ 57 CAT $8 CON'T 5$R$L l@l0151010 013 Il 18 l@l1 1211 la 1719 l@ln 11 11 In I A lo l@

" 0 1 7 8 60 61 DOCKET NUMB ER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEOUENCES h During steady state operation the plant comouter was taken out of service I o 2 i for corrective maintenance at 1600. rendering the inenrp dptoctne evetem I o a linoperable (T.S. 3.3.3.2).

The computer was returned to service at 1825.

I o 4 o s !The excore detector system remained operable durina the event. This is not I La repetitive occurrence.

io s O 7lllo 8l80 7 8 9 E CO E SUSC E COMPONENT CODE SUSCODE S E'lTITllI lE l@ IX l@

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7 8 9 10 11 12 13 18 19 20 SE QUENTI AL OCCURRENCE REPORT REVISION ,,,.LER EVENT YEAR REPORT NO.

CODE TYPE N O.@ yug/RO 17 IY_jl-ll 01 4l6 i W l013l[_()l-llOl aE._21 22 23 24 26 27 28 29 30 31 32 K N AC ON ON PL NT M MOURS S8 i FOR 8.SUPPLI MANUF . tRER IX l@[_Z_j@

l_Z_J@l Z l@l01010101 IY @lNI@l N l@l Xl 06 011l@

34 35 36 37 40 41 42 43 44 47..CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h 1-o IThe Westinohouse P-250 enmutpr's Danid Accou nier (RAD) counter. which trach I m idisc cosition as it rotates, was found to be imorocerly incrementino. The I Icomputer stopped when information was stored on the disc out of oosition.

I i 2 1 3l-~I i 4 I 80 7 8 9: SA. % POWER OTHER STATUS IS O RY DISCOVERY DESCRIPTION l,yj @ l 11 01 Ol@l NAll A l@l Ooerator Observation li s'A TIVITY CO TENT

,.LOCATION OF RELEASE

,, RELEKSED@OPREL'EASEJ@l NAllNAlAMOUNT OF ACTIVITY

-1.,Z_j I i e PERSONNEL EXPOS ES

~[C f'NUMBER TYPE DESCRIPTION I'InIninl@LzJ@l NA l i 7',ERSO~~E'L ,N;ULS

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~Uo8 E R 10lo10l@l NA l t a 7 8 9 11 12 80 LOSS OF OR D AMAGE.O~

.80 mums , TO FACILITY ,T7e,g,oESC 'PT

,, , ,-80 7 8 9 10~NRC USE ONLY

'"'7CR,, TION @

, oE ,5bE @l NAl[tllllllllll13 260 68 69 80 ~7 8 9 10 d. $. Laoiewski/P. ($ Di796 PHONE:(3011234-74a?/7c9g

{NAME OF PREPARER

-

.-LER NO.79-46/3L DOCKET NO.

50-318 EVENT DATE 12/14/79 REPORT DATE 01/10/80 ATTACHMENT CAUSE DESCRIPTION AND CORRECTIVE ACTIONS: (CONTINUED)

Electrical noise sustained on the RAD chassis apparently caused the counter circuit malfunction. Ground straps were checked and an additional grounding strap installed to reduce the noise level, for which no cause has been determined. There has been no recurrence of the problem and no further preventive action is being taken.

-:'.............1755 277.>e.e