ML20032E389
| ML20032E389 | |
| Person / Time | |
|---|---|
| Site: | South Texas  |
| Issue date: | 11/13/1981 |
| From: | Oprea G HOUSTON LIGHTING & POWER CO. |
| To: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, ST-HL-AE-753, V-0530, V-530, NUDOCS 8111200510 | |
| Download: ML20032E389 (4) | |
Text
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The Light m m P u y ii"""" i><n'i"< & i- <<
i u is-iroo ii"""".i<-'< ""i <7i:o228-"2ii November 13, 1981 ST-HL-AE-753 SFN: V-0510
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Mr. Karl Seyfrit
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Director, Region IV
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Os Nuclear Regulatory Commission H
f, 611 Ryan Plaza Drive, Suite 1000
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Arlington, TX 76012
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Dear Mr. Seyfrit.
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South Texas Project Units 1 & 2 Docket Nos. STN 50-498, STN 50-499 Final Report Concerning Damaged Cable Within Westinghouse Supplied Electrical Penetrations on October 15, 1981, Houston Lighting & Fower Company (HL6P), pursuant to 10CFR5C.55(e), notified your of fice of an item concerning an electrical penetration, #67 for the South Texas Project (STP) Unit #2.
An inspection had been perfomed on the subject penetration and the results of the inspection identified that a cable bundle from a terminal block in the penetration was cut.
HL&P has evaluated this item and has determined that it does not meet the criteria of 10CFR50.55(e) and therefore is net reportable.
Our report concerning this item is attached.
If you should have any questions concerning this item, please contact Mr.
Michael E. Powell at (713) 676-8592.
Very truly yours, C
har G. W. Oprea Jr.
Executive Vice President MEP/blt Attachment l
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ilouston Lighting & Power Company cc:
G. W. Oprea November 13, 1981 J. H. Goldberg ST-HL-AE-753 J. G. Dewease SFN: V-0530 D. G. Barker Page 2 C. G. Robertson H. Pyle, III R. A. Frazar D. R. Beeth J. W. Williams J. W. Briskin J. E. Geiger D. E. Sells (NRC)
H. S. Phillips (NRC)
J. O. Read (Read-Poland, Inc. )
M. D. Schwarz (Baker & Botts)
R. Gordon Gooch (Baker & Botts)
J. R. Newman (Lowenstein, Newman, Reis, & Axelrad)
STP RMS Director, Office of Inspection & Enforcement Nuclear Regulatory Commission Washington, D. C. 20555 R. L. Range /G. W. Muench Charles Bechhoefer, Esquire Central Power & Light Company Chairman, Atomic Safety & Licensing Board P. O. Box 2121 U. S. Nuclear Regulatory Commission Corpus Christi, Texas 78403 Washington, D. C.
20555 R. L. Hancock/G. Pokorny Dr. James C. Lamb, III City of Austin 313 Woodhaven Road P. O. Box 1088 Chapel Mill, North Carolina 27514 Austin, Texas 78767 J. B. Poston/A vonRosenberg Mr. Ernest E. Hill City Public Service Board Lawrence Livermore Laboratory P. O. Box 1771 University of California San Antonio, Texas 78296 P. O. Box 808, L-46 Livermore, California 94550 Brian E. Berwick, Esquire William S. Jordan, III Assistant Attorriay General Harmon & Weiss for the State of Texas 1725 I Street, N. W.
P. O. Box 12548 Suite 506 Capitol Station Washinton, D. C.
20006 Austin, Texas 78711 Lanny Sinkin Citizens for Fquitable Utilities, Inc.
Citizens Concerned About Nuclear Power c/o Ms. Peggy Buchorn 5106 Casa Oro Route 1, Box 1684 San Antonio, Texas 78233 Brazc -ta, Texas 77422 Jay Gutierrez, Esquire Hearing Attorney Office of the Executive Legal Director U. S. Nuclear Regulatory Commission Washington, D. C.
20555 Revision Date 10-20-81
Final Report Concerning Damaged Cable Within Westinghouse Supplied Electrical Penetrations November 13, 1981 Description of the Incident on October 15, 1981, Houston Lighting & Power Company (HL&P), pursuant to 10CFR50.55(e), notified your office of an item concerning an electrical penetration, #67 for the South Texas Project (STP) Unit #2.
The subject electrical penetration was manufactured by the Westinghouse Electric Corporation.
An inspection had been performed on the subject penetration and the results of the inspection identified that a cable bundle from a terminal block in the penetratie-termination box was cut.
This inspection was performed as part of the routine close out of a Brown & Root nonconformance report (NCR) regarding cosmetic defects in the penetration assemblies.
Another inspection was performed on October 22, 1981, by HL&P and Westinghouse (W) personnel to determine the extent of the cable damage found in the subject electrical penetration.
The inspection revealed that the cable jacket was cut on three cables. However, the insulation under the jacket did not appear to be penetrated. A continuity test was performed, utilizing an ohm =eter and a probe, in order to determine / measure the extent of damage to the insulation.
The results of the test indicated that the cable insulati..
had been penetrated to the conductor.
In this condition, the damaged cable has the potential to be grounded. The cables of subject penetration serve the control rod drive mechanisms.
HL&P could not determine or identify the mechanism that caused the damage.
Corrective Action A qualified heat shrink sleeve material (Ray-Chem type RNF-100 or equivalent) will be used to repair the cm,le jacket through the use of an approved repair procedure.
In addition, the present installation procedures require continuity testing and megger testing of the cable within the penetration assemblies during installation.
Recurrence Control Recurrence control is not deemed necessary. As previously noted the installation procedures require a visual inspection, continuity and megger testing of the penetration.
In addition, these tests are also performed on the electric circuits during start-up testing.
Such tests and inspections would have discovered this damage during the 1
installation and " check-out" of the penetration assembly.
~
Safety Analysis The equipment powered by this cable is one of the control rod drive l
. mechanisms-(CRDM).
If the cable shorted to ground, =the most likely result
. would be a loss of power to that CRDM. This would cause a rod drop. An.
inadvertent rod drop is a design basis event analyzed and documented 'in the FSAR. The consequences are well within the requirements. Therefore a safety hazard does not exist.
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