ML19294B483

Significant Deficiency Rept SD-369/370/79-12:on 800104, Resistance Temp Detector Had Insufficient Qualification Data for Radiation Levels Postulated in Containment During Accident Condition

ML19294B483
Person / Time
Site:	Mcguire, McGuire
Issue date:	01/04/1980
From:	DUKE POWER CO.
To:
Shared Package
ML19294B482	List: ML19294B481 ML19294B483
References
NUDOCS 8003030410
Download: ML19294B483 (1)

Text

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DUKE POWER CO.

McGuire Nuclear Station Report No: SD-369/370-79-12 Date: January 4, 1980 Facility: McGuire Nuclear Station - Units 1 & 2 Identification of Deficiency: RTD Cable Insufficient Qualification Data Description of Deficiency:

During review of the qualification documentation of electrical equipment for the station, it was determined that the qualification data for the insulation of the single conductors within the RTD cables does not sup-port the qualification of the cables for the radiation levels postulated in the containment during an accident condition. The RTD cables are constructed with hypalon as the insulation materia 1 and also as an interjacketing material under an outer layer of ar. The application of the cable was for the RTD's for the vide range and narrow range monitors and had only been installed in Unit No. 1.

Analysis of Safety Imnlications:

The narrow range RTD's would not be expected to be exposed to a LOCA environment and then be required to operate. In any event, other plant monitors would provide primary plant LOCA protection. The wide range RTD's are required for indication after condition II, III and IV events and these indications could be lost.

Corrective Action:

The twenty-five cables installed in Unit No. I will be replaced with cables using material which is qualified for the postulated environment.

Additionally, written instructions will be issued to the construction site to assure that RTD calbes with adequate qualification data are installed in Unit No. 2. It is expected that these actions will be completed by March 1, 1980.

8003080 9'/6