TENNESSEE VALLEY AUTHORITY CHATTANOOGA. TENNESSEE 37401

51 157B Lookout Place

WBRD-50-390/ 85-53 WBRD-50-391/ 85-50

U.S. Nuelear Regulatory Comission Region II Attention: Dr. J. Nelson Grace, Regional Administrator 101 Marietta Street, IH, Suite 2900 Atlanta, Georgia 30323

Dear Dr. Grace:

HATTS BAR NUCLEAR PLANT UIITS 1 AID 2 - INCORRECT CABLE TRMIIIATIONS FOR CLASS 13 APPLICATIOIS - WBRD-50-390/85-53, WBRD-50-391/85-50 - FINAL REPORT UNIT 1 - INTERIM REPORT UNIT 2

The subject deficiency was initially reported to IRC-OII Inspector Al Ignatonis on October 16, 1985, in accordance with 10 CFR 50.55(e) as SCR UNW QP 8501. Enclosed is our final report for unit 1 and interia report for unit 2. We expect to submit our next report for unit 2 on or about December 6, 1985.

If there are any questions, please get in touch with R. H. Shell at FTS 858-2688.

Very truly yours,

TRNNESSEI VALLEY AUTHORITY

/ u, z/. . W. Huham. nag

Licensing and Risk Protection

Inclosure cc: Mr. Jams Taylor, Director (Enclosure)

Office of Inspection and Enforement U.S. Nuclear Regulatory Coaission Washington, D.C. 20555

Record Center (neclosure) Institute of Nuelear Power operations 1100 Circle 75 Parkway, Suite 1500 Atlanta, Georgia 30339

8512110567 851119 PDR ADOCK 05000390 S PDR

.. ~ . ., ~. ~... &

EnCLOSURE WATTS BAR NUCLEAR PLANT UNITS 1 AND 2

INCORRECT CABLE TEKMIUATIONS FOR CLASS 1E APPLICATIONS WBRD-50-390/85-53 AND WBRD-50-391/85-50

SCR -BN BQP 8501 10 CFR 50.55(e)

FINAL REPORT - UNIT 1 INTIEIM REPORT - UNIT 2

Description of Deficiency

During an environmental qualification review for equipment at Watts Bar Nuclear Plant (W1O), a deficiency was identified in TVA General Construction Specification G-38, "Installing Insulated Cables Rated V .o 15,000 Volts." The deficiency was that G-38 allowed the use of electrical cable splicing methods and materials (e.g., tapes, preinsulated butt splices, and nonnuclear Raychem heat shrinkable tubing) which are not qualified for class 1I applications in harsh environments. The cause of this deficiency is that while G-38 did specify that nonqualified materials could be used in nonc.ass 1B applications, it did not specifically require nor clearly state that only qualified materials could be used for class 1I applications in harsh environments.

Safety Imlications

Unqualified insulation on class 1I terminations in harsh environmertz could deteriorate due to the effects of heat, moisture, or radiation. This could allow affected esbles to short circuit to other cables or to conduit. This could result in a failure or spurious actuatior of affected class 1i equipment. This could adversely affect the safe operation of the plant.

Corrective Action - Unit I

TVA is revising G-38 to more clearly define the requirements for the use of qualifie4 termination and splicing materials for class 1I applications. All class 1B terainations and splices located in harsh

navironments will be identi:'ed. Those affected splices or terminations which are comprksed of unqualified materials will be reworked using qualified materials as specified in TVA Standard Drawings SD-E12.5.3, SD-412.5.4, SD-B12.5.5-1, SD-312.5.5-2, SD-E12.5.5-6, SD-E12.5.7-1, SD-112.5.7-2, and SD-B12.5.b, and C-38.

The revision to C-38 will be completed by November 30, 1985. All corrective actions for WBN unit 1 for this item will be completed by fuel load for unit 1.

All future terminations and splices for class 1i applications in harsh environments will be instailed using only qualified materials as specified above. This will prevent recurrence of this deficiency.

Interim Progress - Unit 2

TVA is still evaluating this deficiency for WBN unit 2. Corrective actions for unit 2 will be similar to those for unit 1. The next report on this item will be submitted on or about December 6, 1985.