AECM-88-0217, Corrected Special Rept 88-006:on 881021,inoperability of Accident Range Radiation Monitor Discovered.Caused by Damaged Cable Assembly.Cable Assembly Replaced

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Corrected Special Rept 88-006:on 881021,inoperability of Accident Range Radiation Monitor Discovered.Caused by Damaged Cable Assembly.Cable Assembly Replaced
ML20206K803
Person / Time
Site: Grand Gulf Entergy icon.png
Issue date: 11/04/1988
From: Cesare J
SYSTEM ENERGY RESOURCES, INC.
To:
NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
88-006, 88-6, AECM-88-0217, AECM-88-217, NUDOCS 8811290549
Download: ML20206K803 (2)
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CORRECTED COPY To correct Special NYN7EM ENEN6y Report ID number; RESOURCES, #NC. should have been Jcm o cm .n 88-006 c=eco November 4, 1988 reem, tem U. S. Nuclear Regulatory Comission Mail Station P1-137 Washington, D. C. 20555 Attention: Document Control Desk Gentlemen:

SUBJECT:

Grand Gulf Nuclear Station Unit 1 Occket Nc. 50-416 License No. NPF-29 Special Report 4L40.188-006 Inoperability of Accident Monitor Exceeds 72 Hours AECM-88/0217 A containment ventilation exhaust accident range radiation monitor was removed from service on October 21, 1988 at 0815 to perform a surveillance as required by Technical Specification Table 4.3.7.5-1. Erratic recdings were observed during the surveillance. Investigations revealed a damaged cable assembly. The cable assembly was replaced. In addition, it was noticed that the Channel 3 detector tube was decreasing in sensitivity; therefore, the Channel 3 detector tube was also replaced.

During the monitor retest, the background channel (Channel 2) failed.

This problem was investigated and the Channel 2 detector tube was determined to be defective. The Channel 2 tube was replaced and the monitor reteste<!

satisfactorily. The monitor was restored to service on November 3 at 1530.

l This Special Report is being submitted pursuant to Action 81 of Technical Specification Table 3.3.7.5-1 since the instrument channel was inoperable

! longer than 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. The preplanned alternate method of monitoring per Action 81 is to utilize the Eberline Sping monitoring system per procedure 08-S-04-220.

The nonnal effluent monitoring instrumentation was functional during this time period.

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  • ct: Mr. T. H. Cloninger Mr. R. 8. McGehee Mr. N. S. Reynolds
,o Mr. H. L. Thomas Mr. H. O. Christensen Mr. Malcolm L. Ernst Acting Reaionel Adr.inistrator U.5.NuciearRegulatoryCommission Region II 101 Marietta St., N. W., Suite 2900 Atlanta, Georgia :30323 Mr. L. L. Kintner, Project Manager Office of Nuclear Reactor Regulation U. S. Nuclear Regu'latory Connission Nail Stop 14B20 Washington, D.C. 20555 1

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