ML20212C114

Rev 0 to Qualification Evaluation of Splices Located in Non-High Energy Line Break Areas

ML20212C114
Person / Time
Site:	Duane Arnold
Issue date:	12/19/1986
From:	Olson O IES UTILITIES INC., (FORMERLY IOWA ELECTRIC LIGHT
To:
Shared Package
ML20212B692	List: ML20212B820 ML20212B898 ML20212C114 NG-86-4544, Forwards Scotch Brand Tapes Maint Procedure GMP-ELEC-008, Installation Instructions, Rev 0 to QUAL-M345-00, Preliminary Equipment Qualification Record for 3 M Tapes & QUAL-A602-00, Qualification of Splices ..
References
QUAL-A602, QUAL-A602--R, QUAL-A602-00, QUAL-A602-00-R00, NUDOCS 8612290393
Download: ML20212C114 (4)

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QUAL-A602-00 Rev.0

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Attachment 3 to NG-86-4544 t

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QUALIFICATION EVALUATION OF SPLICES LOCATED IN NON HIGH ENERGY LINE BREAK AREAS 4

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Approved by c dfo. 14 h M8G.

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Attachment 3 to NG-86-4544 Qualification Evaluation of Non-High Energy Line Break Amp Butt Splices

1.0 INTRODUCTION

This report provides environmental qualification assessment for electric cable butt splices in non-high energy line

. break appitcations. The specific configuration is inline, butt splices that are not sealed from moisture integrally or through taping methods.

The subject butt splices are manufactured by the Amp Corporation. The only organic material found in the butt splices is the nylon or polyvinylidene fluoride insulator that covers the metallic connector.

This provides qualification of these butt splices until the cycle 8/9 refueling outage. IEE 323-1974 assessment of these butt splices will be completed by the end of the cycle 8/9 refuel outage start-up.

2.0 REQUIREMENTS Environmental service conditions were limited to areas whose accident environments were not induced by direct exposure to high energy line break steam and high temperature cond-itions (referred to as radiation only environments).

The most restrictive parameters for radiation only environ-ments include:

Normal Ambient Temperature: 104 deg f Accident Ambient Temperature: 140 deg f Relative Humidity: 20 to 90%

• Total Radiation Dose: 26 megarads

• 40 year integrated plus accident dose Because the radiation only equipment are not exposed to line breaks, pressure is not a environmental qualification Concern.

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3.0 QUALIFICATION ASSESSMENT 3.1 AMP CORPORATION NYLON BUTT SPLICES The nylon butt splices were tested by Wyle Laboratories for Commonwealth Edison Company. Testing included normal thermal aging, normal and accident radiation exposures and LOCA simulation. Thermal aging was completed by exposing butt splices to 265 degrees Fahrenheit for 482 hours0.00558 days <br />0.134 hours <br />7.969577e-4 weeks <br />1.83401e-4 months <br />. A thermal aging calculation has been completed to show that the temperatures specified in section 2.0 are enveloped. Functional testing done after the thermal aging resulted in acceptable insulation resistance readings of 780,000 megohms at 500VDC.

Radiation testing included total exposure to 200 megarads and conservatively envelopes the radiation requirements of section 2.0. Functional testing done after the radiation exposure resulted in acceptable insulation resistance readings of 250,000 megohms at 500 VDC.

The LOCA simulation done resulted in insulation breakdown of the butt splices due to moisture intrusion. The moisture intrusion concern is not applicable since the non-HELB areas due not exceed 90% humidity conditions.

Humidity will not affect the performance of the nylon butt splices. Humidity degradation is caused by condensation of moisture on the splices. Due to the fact the high ambient temperatures are constant in these areas and that air circulation is adequately provided by the heating and ventilation system, condensation will not occur for radiation only environments.

The test results detailed above demonstrate environmental qualification of radiation only equipment. The insulation resistances found in the functional testing are acceptable for instrumentation, control and power applications.

Because condensation is not a factor and testing demon-strated extremely high insulation resistance, leakage currents through adjacent, touching butt splices will be negligible.

3.2 AMP CORPORATION POLYVINYLIDENE FLUORIDE BUTT SPLICES Qualification of Amp polyvinylidene fluoride butt splices is provided by the Duane Arnold Energy Center Environment-al (DAEC) Qualification Record File Qual-A602-00. Testing resulted in satisfactory functioning through thermal aging, vibration, seismic, radiation, and LOCA simulation testing.

All sequences of this test envelope requirements stated in section 2.0 of this evaluation.

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The installed configuration during testing did not allow adjacent butt splices to touch each other. Therefore, a direct determination of acceptable leakage current through butt splice insulations could not be demonstrated.

Testing included function checks of dielectric breakdown through voltage testing at 2200 VAC rms. These checks were found to be acceptable and demonstrate the integrity of the butt splice insulation.

I Because the areas being assessed are not exposed to direct steam exposure and condensation is not possible, the test demonstrates environmental qualification of radiation only equipment. Though leakage current acceptability could not be directly demonstrated, the functional test data proves strong insulation integrity that would prevent current leakage through the polyvilnyidene fluoride insulation.

Because condensation is not a factor, current leakage through moisture occurring in adjacent butt splices is is not possible.

Amp' tested polyvinylidene fluoride butt splices were sealed on each end of the splice to preclude moisture intrusion.

The Amp butt splices used at the DAEC are identical to the tested butt splices except that the sealing is not pro-vided. High energy line break butt splices have been taped to provide the needed moisture prevention. This evalua-tion is limited to areas free of moisture intrusion prob-lems. No sealing is required for the butt splices. Because the only difference between butt splices tested by Amp and those installed in radiation only areas is the unneeded sealed ends, testing applies to DAEC butt splices.

3.3 GENERIC ENVIRONMENTAL ISSUES Submergence is not an issue for this evaluation. All splices are above flood levels in the areas of concern. Also, chemical spray is not a concern in this evaluation. No areas addressed in this evaluation are subject to spray impingement.

4.0 CONCLUSION

Butt splices installed in radiation only environments are qualified for their environment and operation through cycle j 8/9 refuel outage.

1 Actual testing has been successfully completed on the butt splice for similar DAEC applications. Because the splices evaluated are in an environment that does not

allow moisture intrusion, test results are acceptable.

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