ML20024D007

LER 83-035/03L-0:on 830610,during Normal Power Operation,Esf Actuation Sys Channel Zg Steam Generator Level Tripped. Caused by Failed Vitro Isolator Module.Module Replaced.W/ 830708 Ltr

ML20024D007
Person / Time
Site:	Calvert Cliffs
Issue date:	07/08/1983
From:	Basso L, Porter R, Russell L BALTIMORE GAS & ELECTRIC CO.
To:	Murley J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
LER-83-035-03L, LER-83-35-3L, NUDOCS 8307210285
Download: ML20024D007 (2)

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EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h o2 l During normal power operation at 1130. ESFAS Channel ZG steam nenerator l l 013 l l 1evel was found to be tripped (T.S. 3.3.2.1.b). Repairs to the channel l l014l(_werecompletedandthechannelwas returned to service at 1430. Durine l l o 15 l I this e.y_cnt all remainine channels remained operable. l o 6 l Similar eventH: 50-317/83-17; 50-318/82-02, l I O I > I (. I NI *=~ =: .: = E ...P.NEN,...E . :.E .=:E

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(f.j@l2Lj@ [Z_j@ l_2.j @ l 0 101 01 0l [N_j @ (_y_J @ (_N_j@ IV l1 l 3 l 2lo u u n u n a u u u u CAUSE DESCRIPTION AND COHRECTIVE ACTIONS h lM l The cause of the tripped ESFAS channel was found to be a failed Vitro l l1l1l1 isolator module (N#04341A26023 VL-C-23929). The module was repinced I 1 2 (_w_itita_ snare and returned to Vitro for renair and root cause analysis. I l1l3ll An update will be submitted when the failure analysis is returned from l l114lI the vendor. l

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NAME OF PREPT.AEn R. J. Porter /L. F Basso __ PHONE: 301-269-4747/4933

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-ci BALTIMORE G AS AND ELECTRIC COMPANY P.O. B O X 14 7 5 B ALTIMOR E M AR YL AN D 212o3 NUCLEAR POWER DEPARTMENT

. CALVERT CLIFFS NUCLEAR POWER PLANT LUSBY, M ARYL AND 2C657

' July S. 1983 Dr. Thomas Murley Docket No. 50-317 Regional Administrator License No. DPR 53 U. S. Nuclear Regulatory Commission Region 1 631 Park Avenue King of Prussia, PA 19406

Dear Dr. Murley:

Attached is LER 83-35/3L as required by Technical Specification 6.9.

If you have any questions regarding this report, we would be pleased to discuss them with you.

Very truly yours,

[,, L. B. Russell Plant Superintendent T.BR:LFB:bsb cc: Director, Office of Management Inforcation and Program Control Messrs: A. E. Lundvall, Jr.

J. A. Tiernan x

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