ML20076H283

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Rev 0 to Technical Note 51187, Procedures for Repairing Prefabricated Panel & Preshaped Conduit Section Fire Barriers Installed at Plant
ML20076H283
Person / Time
Site: Turkey Point  NextEra Energy icon.png
Issue date: 05/31/1987
From:
THERMAL SCIENCE, INC.
To:
Shared Package
ML20076E803 List:
References
FOIA-93-230 51187, NUDOCS 9410210143
Download: ML20076H283 (7)
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..:1.l" $ f APPENDIX III TO THERMAL SCIENCE, INC.'S RESPONSE TO THE UNITED STATES NUCLEAR REGULATORY COMMESION'S LETTER DATED 10 SEPTEMBER 1991 Enclosure 28 TSI Technical Note 51187 Procedures For Repairing Prefabricated Panel and Preshaped Conduit Section Fire Barriers Installed At The Turkey Point Nuclear Plant REV O May 1987 0.. , n 0 0 0 I N le l

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TSI TECHNICAL NOTE 51187 PROCEDURES FOR REPAIRING PREFABRICATED PANEL AND PRESHAPED CONDUIT SECTION FIRE BARRIERS INSTALLED AT THE TURKEY POINT hTCLEAR PLANT I

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i DATE OF ISSUE: 7 MAY 1987 l THERMAL SCIENCE, INC. + 2200 CASSENS DR.

  • ST. LOUls. MO 63026 .(314)349-1233 Telex: Domestic 44-2384
  • Oversecs 209901+ Telecopier (314 ) 349 1207

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TS1 TECHNICAL NOTE 51187 PROCEDlfRES FOR REPAIRING PREFABRICATED PANEL AND PRESHAPED CONDUIT SECTION FIRE BARRIERS INSTALLED AT THE TURKEY POINT NUCLEAR PLAh'T INTRODUCTION These repair procedures set forth the sequential steps involved in making required sealing and drainage corrections ** the THERMO-LAG 330 Fire Barrier System Materials installed at Florida Power and Light Corporation's Turkey 4 Point Nuclear Power Generating Plant. These corrections are required to enhance the stability of the system when exposed to intensive rain, followed by direct exposure to heat by the sun.

The program of corrective action is fourfold. It involves removing water damaged fire barrier sections and replacing them with new sections. It involves 1) removing all defective caulking material and then resealing the seams and joints with the THERMO-LAG 260 Sealistic Rapid Curing Elasto=eric Caulk, 2) installing drainage holes everywhere that an inv,erse change occurs in the fire bctrier system and where ponding water is apt to occur, and 3) the removal of cracked, pinholed or otherwise damaged topcoat , and then applying a dual topcoat system comprised of an initial coat of the THERMO-LAG 350-2000 Topcoat, followed by a second coat of the THERMO-LAG 350-5000-10 Topcoat.

The following paragraphs highlight the detailed procedural steps involved in implementing these corrections to the fire barriers previously installed at Turkey Point Nuclear Power Generating Plant.

6 1.0 REMOVAL AND REPLACEMENT OF WATER DA'dAGED FIRE BARRIER SECTIONS 1.1 Procedure Description The repair of damaged sections of THERMO-LAC 330 Fire Barrier System Materials is accomplished by identifying and removing the damaged prefabricated panels and preshaped conduit sections, replacing them with new material, caulking the edges and joints, and applying a dual topcoat which is impermeable to water vapor.

1.2 Procedure Steps 1.2.1 Identify all fire barrier sections which show any abnormalities such as soft and spongy material, leaching, or other visual evidence of weathering effects. Use an indentation measurement of 150 mils obtained with a Chatillon Push Gauge set at 25 pounds to identify fire barrier sections which need to be removed.

1.2.2 Cut the tie wires or steel bands fastening the water damaged fire barrier sections together and remove the damaged material back to solid dry material.

1.2.3 Removal all foreign matter from the exposed substrate surfaces resulting from removing the damaged material.

1.2.4 Cut or form replacement sections from prefabricated panels or-preshaped conduit sections.

1.2.5 Mount the replacement sections in the spaces created by the removal of the water da= aged material, using approved stainless steel tie wire or stainless steel banding material. The recommended maximum spacing between the tire vires or steel banding should not exceed 12 inches.

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J 1.2.6 Fill in all edges and joints with a bead of THERMO-LAG 269 Sealistic Rapid Curing Elastomeric Caulk. The minimum cross-sectional thickness of the bead shall be 0.500 inches for a one hour fire barrier and 1.00 inches for a three hour fire barrier.

1.2.7 After the elastomeric caulk has hardened to touch, apply the THERMO-LAG 350-2000 Topcoat by brush or roller in multiple passes or criss-cross techniques, at a spread rate of 50 square feet per gallon.

1.2.8 After the THERMO-LAG 350-2000 Topcoat has hardened to touch, apply the THERMO-LAG 350-5000-10 Topcoat by brush or roller in multiple passes or criss-cross techniques, at a spread rate of 50 square feet per gallon.

2.0 REM 0 VAL AND REPLACEMENT OF Dr.FECTIVE CAULKING MATERIAL 2.1 Procedure Description The removal and replacement of defective caulking material is acco=plished by

- removing ali- caulking unterial that has cracked or receded from the edges or "

joints of the fire barriers and then resealing these edges and joints, using the THERMO-LAG 269 Sealistic Rapid Curing Elastomeric Caulk.

2.2 Procedure Steps 2.2.1 Remove all cracked or receding caulking material from the edges and joints of the fire barriers by means of cutting, scraping, and grinding methods.

2.2.2 Brush all foreign matter from the edges and joints.

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3.2.2 Cut the tie wires and steel bands fastening the prefabricated panels or preshaped conduit sections together and remove the fire barrier from the raceway or structural steel entity.

3.2.3 Drill 1/2 inch holes at three (3) inch spacing along the bottom of all sections of the barrier where water may accumulate and pond.

3.2.4 Select the required number of 1/4 inch plastic tubes and butter them with the THERMO-LAG 330-1 Subliming Catalyzed Material - Trowel Grade.

3.2 5 Insert the plastic tubes in the drilled holes and tap them into place.

3.2.6 Reassemble the fire barrier sections using approved stainless steel tie wire or stainless steel banding material. The recommended maximu= spacing between the tie v!-e or steel banding should not exceed 12 inches.

3.2.7 Fill in the edges and joints with a bead of the THERMO-LAG 269 Sealistic Rapid Curing Elastomeric Caulk. The minimum cross-sectional thickness of the bea= shall be 0.500 inches for a one hour fire barrier and 1.00 inches for a three hour fire barrier.

3.2.8 After the elastomeric caulk has hardened to touch, apply the THERMO-LAG 350-2000 Topcoat by brush or roller in multiple passes or criss-cross techniques, at a spread rate of 50 square feet per gallon.

3.2.9 After the THERMO-LAG 350-2000 Topcoat has hardened to touch, apply the THERMO-LAG 350-5000-10 Topeoat by brush or roller in multiple passes or criss-cross techniques, at a spread rate of 50 square feet per gallon.

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1 s 1 4.0 RDf0 VAL AND REPLACEMENT OF CRACKED OR OTHERWISE DAMAGED TOPCOAT 4.1 procedure Description The removal and replacement of cracked or otherwise damaged topcoat is accomplished by removing all defective topcoat by wire brushes or sanding, and then apply a dual topcoat system which is impermeable to water vapor.

4.2 procedure Steps 4.2.1 Visually inspect the existing topcoat for cracking, peeling and/or pinholes.

4.2.2 Remove any damaged topcoat by wire brushing or sanding methods.

4.2.3 Brush away all foreign matter.

4.2.4 Apply a coating of the THERMO-LAG 350-2000 Topcoat by brush or roller in multiple passes or criss-cross techniques, to replace the topcoat removed in Step 4.2.2, at a spread rate of 50 square feet per gallon.

n .m 4.2.5 After the THERMO-LAG 350-2000 Topcoat hat., hardened to touch, apply the THERMO-LAG 350-5000-10 Topcoat by brush or roller in multiple passes or criss-cross techniques, at a spread rate of 50 square feet per gallon.

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