ML20054K445

Final Deficiency Rept Re Defects in Eberline Instrument Corp Radiation Monitoring Equipment,Orginally Reported on 820423.Request for Piggyback Circuit Board Initiated to Prevent Microprocessor Memory Data Loss

ML20054K445
Person / Time
Site:	Fermi
Issue date:	06/14/1982
From:	Wells D DETROIT EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
10CFR-050.55E, 10CFR-50.55E, EF2-58745, NUDOCS 8207020140
Download: ML20054K445 (2)

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EF2-58745 Mr. James G. Keppler, Regional Administrator Region III U.S. Nuclear Regulatory Ccmnission 799 Roosevelt Road Glen Ellyn, Illinois 60137

Subject:

Final Report of 10CFR50.55(e) Item on Defects in Eberline Instrument Corporation Radiation Monitoring Equiptent (#67) 6

Dear Mr. Keppler:

This is Detroit Edison's final report on the defects in Eberline Instrument Corporation radiation monitoring equipment problem. This problem was origi-nally reported to Mr. H. Wescott of NRC Region III by Detroit Edison's Mr.

H.A. Walker, Supervisor-Construction Quality Assurance, on April 23, 1982.

Eberline had notified the NRC that a potential for failure in the micro-processor based SPING series radiation monitors existed. As a consequence, the Project had reviewed the potential effects of this reported failure and had concluded that a loss of microprocessor memory did not result in the creation of a potential safety hazard on the specific Fermi 2 installa-tion. The radiation channels which monitor the standby Gas Treatment System effluent following an accident (AXM's) were found not to be affected by this hardware failure. The balance of the gaseous effluent monitors identified by Eberline could be effectively rendered inoperable as monitoring instruments by this failure. Since these effluent monitors are not used in the mitigation and/or moniotoring of any design basis events, their failure is not considered to be safety significant. Practically, each of the effluent monitors trips the HVAC system being monitored and a nemory failure will generally result in a trip of the associated ventilation system.

Project Engineering has initiated a request for the field installation of the Eberline supplied piggyback circuit board which has been designed by the manu-facturer to prevent the loss of data in the microprocessor memory. It is ex-pected that these modifications will be installed in the system prior to the initial checkout of the monitors by the plant Start-Up Group.

If you have questions concerning this matter, please contact Mr. H.A. Walker, Supervisor-Construction Quality Assurance.

Very truly yours, n

DAW / HAW /cp r

O207020140 820614 PDR ADOCK 05000341 JUN 2 81982 Y-

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i Mr. James G. Keppler, Regional Administrator June 14, 1982 Page Two EF2-58745 1

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i cc: Mr. Richard DeYoung, Director l

Office of Inspection and Enforcement Division of Reactor Inspection Programs U.S. Nuclear Regulatory Cm mission Washington, D.C.

20555 l

Mr. Bruce Little, Resident Inspector i

U.S. Nuclear Regulatory Cmmission i

6450 North Dixie Highway i

Newport, Michigan 48166 j

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