ML20079R417

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Trip Rept of 930718-22 Visit to Omega Point Lab,San Antonio, Tx Re Thermo-Lag Fire Barrier Test Program for Comanche Peak Steam Electric Station,Unit 1
ML20079R417
Person / Time
Site: Comanche Peak Luminant icon.png
Issue date: 08/16/1993
From: Singh A
Office of Nuclear Reactor Regulation
To: Mccracken C
Office of Nuclear Reactor Regulation
Shared Package
ML20079Q777 List:
References
FOIA-94-137 TAC-M85536, NUDOCS 9308240226
Download: ML20079R417 (11)
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Text

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[0 N August 16, 1993 MEMORANDUM:

Conrad E. McCracken, Chief Plant Systems Branch Division of Systems Safety and Analysis THRU:

K. Steven West, Chief Special Project Section Plant Systems Branch Division of Systems Safety and Analysis FROM:

Amarjit Singh, Reactor Systems Engineer Plant Systems Branch Division of Systems Safety and Analysis

SUBJECT:

TRIP TO OMEGA POINT LABORATORIES, SAN ANTONIO, TEXAS REGARDING THERM 0-LAG FIRE BARRIER TESTPROGRAM FOR COMANCHE PEAK STEAM ELECTRIC STATION UNIT 1 (TAC NO. M85536)

The enclosed trip report covers my observations of Thermo-Lag fire barrier test specimen construction by the Texas Utilities Electric Company for -

the qualification of Thermo-Lag fire barriers installed in the Comanche Peak Steam Electric Station, Unit 1.

This report covers the construction performed from July 18 through 22, 1993, at Omega Point Laboratories, San Antonio, Texas.

W hy Amarjit Singh, Reactor Systems Engineer Special Projects Section Plant Systems Branch Division of Systems Safety and Analysis

Enclosure:

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TRIP REPORT' Facility:.

Omega Point' Laboratories, San Antonio, Texas i

Licensee:

Texas Utilities Electric Company.

Plant:.

Comanche Peak Steam Electric Station, Unit I Docket No.:

50-445 Trip Dates:

July 18 through 22, 1993

_. Reviewer:

Amarjit Singh, NRR i

INTRODUCTION On' July 18 through 22, 1993, I visited.0mega Point Laboratories (OPL), San Antonio, Texas, to witness and monitor Texas Utilities Electric Company's (TU Electric Station,, the licensee) construction of raceway test ' specimens for Comanche Peak Steam Electric Unit-1-(CPSES).: Licensee personnel and contractors contacted during this visit were 0..'Bhatty, R. McGaugley and R. Swanson of TU Electric; Calvin Banning of ABB Impell; L'. Griffin, W. Eames, J. Reed, J. Tatum, C. Martinez, R. Daniel and_C. Hill of Brown and Root; and R. Thorton and G. Pearson of Flour Daniel.

In addition, the following'OPL, A

personnel were contacted: Deggary Piest, President; Constance Humphrey, l

N Quality Assurance Manager and Vice President; and Kerry Hitchkock,' Shop -

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Forman.

CONSTRUCTION ACTIVITIES Backaround During a teleconference with the NRC staff on June 29, 1993, TU Electric informed the staff of preliminary plans for the qualification' testing of i

Thermo-Lag fire barrier installations at Comanche' Peak Unit 1.

By letter-dated July 13, 1993, the licensee submitted the preliminary details of th'e l

testing planned for Unit 1.

TU Electric has contracted OPL, San Antonio, i

Texas, to conduct the test program, perform quality assurance check point inspections and write the final test reports. CPSES stock Thermo-Lag fire i

barrier material was used to fabricate the test specimens. Site craft personnel (contractors) installed the Thermo-Lag material in accordance with I

CPSES installation procedures. The specimens were inspected by CPSES quality -

control inspectors.

l Observation 1

I' observed the construction of two test specimens, Scheme 11-5 and Scheme 13 2.

I also reviewed the following procedures and specifications.

Comanche Peak Steam Electric Station Unit 1 and 2, Specifications, f

" Cable Raceway Fire Barrier Materials," 2323-MS-38H, Revision 3 dated November 2, 1992.

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" Receipt Inspection Verification Plan for Thermo-Lag fire Barrier p

Materials," dated February 24, 1992.

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7 l i CPES-N-2032 Revision 0," Procurement and Installation of Fire Barrier and Fire Proofing Materials," dated February 28, 1991

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Test Plan, Revision ll, "One Hour Fire Endurance Tests of Articles Protected with the Thermo-Lag Fire Barrier System."

Scheme 11-5 consisted of three 24-inch wide by 4-inch high ladder back cable i

tray assemblies with various joint reinforcement methods. The trays were protected with 1/2 inch (nominal) thick Thermo-Lag board sections with ribs.

One tray was upgraded with circumferential1y wrapped stress skin and trowel grade Thermo-Lag material around butt joints and on 2 foot intervals.

The 1

second tray was upgraded with stress skin and trowel grade material applied along longitudinal joints only. The third tray was: upgraded with a braided ceramic banding material wrapped circumferential1y around butt joints on 2 foot intervals. The stress skin was overlapped and. stapled onto the panels.

The trowel grade material thickness was approximated to 1/16-inch layer or until the underlying stress skin was no longer' visible in accordance with specification MS-38 H, Paragraph 2.7.10.11.6(a)(vi).

I inspected the thickness of the trowel grade material at a number of points!on the 24-inch trays. The troweled layer ranged from 1/16-inch thick to about 1/4-inch thick. The thickness of the trowel grade material at any particular point was at least 1/16-inch thick.

The complete constructed scheme was inspected by the licensee quality control and assurance inspectors and was accepted.

Scheme 13-2 consisted.of a 12-inch wide by 4-inch high ladder back cable tray with 90 degree bends and a 2-inch diameter conduit with two radial bends. The cable tray was protected with 1/2-inch (nominal) thick Thermo-Lag board sections with ribs. This tray configuration will be tested as currently installed in Unit I without any upgrade of butt or longitudinal joints. The 2-inch diameter conduit was protected with 1/2-inch (nominal) thick prefabricated Thermo-Lag material. The radial bends were up-graded with flexible stainless steel mesh and trowel grade Thermo-Lag material. The Thermo-Lag attributes being tested are 12-inch cable tray coverage with no joint upgrade and conduit radial bend upgrade with the flexible mesh (for detail see attached drawings).

The installers appeared skilled and trained. I also reviewed their training records and verified that the installers and the licensee's quality' control inspectors were trained and qualified.

SUMMARY

The fabrication of the TU test specimens was accomplished in a skilled and a professional manner. The installers carefully followed procedures and consulted with engineering. staff when questions arose.

The licensee's quality control and quality assurance personnel monitored the construction closely and properly verified the adequacy of the installations.

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