ML20153A982

Safety Evaluation Re Employee Concern Element Rept 19101, Galvanized Steel Junction Boxes

ML20153A982
Person / Time
Site:	Sequoyah
Issue date:	03/11/1988
From:	NRC OFFICE OF SPECIAL PROJECTS
To:
Shared Package
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References
NUDOCS 8803210319
Download: ML20153A982 (2)

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NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 SAFETY EVALUATION REPORT BY THE OFFICE OF SPECIAL PROJECTS EMPLOYEE CONCERN ELEMENT REPORT 19101 "GALVANIZED STEEL JUNCTION B0XES" TENNESSEE VALLEY AUTHORITY SE000YAH NUCLEAR POWER PLANT, UNITS 1 AND 2 DOCKET NOS. 50-327 AND 50-328 I.

SUBJECT Category:

Construction (10,000)

Subcategory:

Electrical Equipment (19,100)

Elemert:

Galvanized Steel Junction Boxes (19,101)

Employee Concern:

IN-85-913-001 The basis for Element Report CO 19101-SON, Revision 3, dated March 16, 1987 is Watts Bar Employee Concern IN-85-913-001 which states:

"Electrical Junction Boxes are not per G-40 anc' electrical standard drawings, in that they are manufactured of galvanized steel instead of sheet steel with paint on both sides.

These junction boxes may be found throughout the plant especially in the ADGB (Auxiliary Diesel Generator Builcling).

CI had no further information.

No followup required."

This concern was evaluated by TVA to be potentially ruelear safety-related and potentially applicable to the Sequoyah Nuclear Plant (generic).

II.

SUMMARY

OF ISSUES The problem as defined by TVA is that galvanized steel junction boxes were thought.to be unacceptable since TVA procedures did not specifically allow their use.

These galvanized junction boxes could be found throughout the plant.

III. EVALUATION The TVA Employee Concern Task Group (ECTG) evaluators reviewed various documents, including Patts Bar ECTG Element Report C019101 and Modification and Addition Instruction (M&AI)-6, "Installation of Conduit and Junction Boxes." This review revealed that the procedures and instructions state that materials used in the installation of electrical conduit systems and boxes must meet the requirerents of an approved recognized standard but do not specifically list galvanized steel as an accepted material for junction boxes.

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2 TVA evaluators also interviewed a Modification and Addition Engineer who indicated that Junction boxes were either specified and procured by Division of Nuclear Engineering (DNE), or fabricated ensite utilizing a Standard Drawing S0-E13.6.3-1, Revision 5, which specifically lists sheet metal and painting as the material used for junction boxes.

TVA evaluators concluded that procedure M&AI-6, Revision 6 is adequate as written and is censistent with Article 370-20 of the National Electric Code, and therefore, no corrective action is necessary.

However, the staff was concerned regarding the accountability of galvarized steel material in the post-LOCA hydrogen generation calculation. TVA, in their letter of January 14, 1988 have stated that a physical walkdown was conducted to account for all galvanized steel or zinc material.

All rework performed after the walkdown is controlled by design change documents which are reviewed to ensure that any charge in the amount of galvanized or zine material used in the containment building is noted for consideration in recalculation of hydorgen generation.

IV.

CONCLUSION The NRC inspectors reviewed the Element Report and its associated ECTG file, discussed the issue with the ECTG evaluator and Sequoyah personnel, and reviewed related documents and drawings.

The NRC staff concludes that TVA's investigation and evaluation of the concern as described in C019101-SON -

Revision 3, are adeouate.

No further action by the f:P.C is required.

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