TXX-6201, Interim Deficiency Rept CP-86-82 Re Cable Tray Hanger (Cth) Splice Welds.Initially Reported on 861208.CHTs W/O Thermolag Examined & Locations Noted on as-built Drawings.Next Rept Anticipated by 870403
| ML20207P942 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 01/06/1987 |
| From: | Counsil W, Keeley G TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | Johnson E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| CP-86-82, TXX-6201, NUDOCS 8701200441 | |
| Download: ML20207P942 (2) | |
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r Log # TXX-6201 File # 10110 TEXAS UTILITIES GENERATING COMPANY 903.9 SKYWAY TOWER = 409 780RYH OR.IVE STREET. LB. 88. DALLAS. TEXA8 753DI January 6, 1987
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Mr. Eric H. Johnson, Director Division of Reactor Safety and Projects RI3E U. S. Nuclear Regulatory Commission Arlington, TX 76012 y
611 Ryan Plaza Drive, Suite 1000
SUBJECT:
COMANCHE PEAK STEAM ELECTRIC STATION (CPSES)
DOCKET NOS. 50-445 AND 50-446 CABLE TRAY HANGER SPLICE WELDS SDAR: CP-86-82 (INTERIM REPORT)
Dear Mr. Johnson:
On December 8,1986, we verbally notified your Mr. Ian Barnes of a deficiency involving certain welds which are used to splice cable tray hangers (CTHs) channel sections end-to-end to form posts. We have concluded that this deficiency is reportable under the provisions of 10CFR50.55(e) The required information follows.
DESCRIPTION OF PROBLEM During the as-built program of the Unit 1 CTHs, occasionally welds were used to splice CTHs channel sections end-to-end to form posts. Visual inspections could not confirm that the required full penetration welds have been achieved and that the structural and functional design requirements of the hanger were met. Accordingly, these inaccessible welds have been designated as seal welds in the as-built drawings. Radiographic examination of a sample of these welds has shown that in every instance, the weld penetration is incomplete and the welds are inadequate to achieve the structural and functional design requirements of the hanger.
The lack of a proper weld at the splice of the channel sections in the CTH posts could result in the failure of the post at that location.
This condition could prevent the hanger from functioning as designed resulting in failure of the hanger and the supported tray (s).
SAFETY IMPLICATION In the event the deficiency had remained uncorrected, the failure of a CTH could affect the functionability of essential electrical cables and result in the inability of the safety related systems to perform as required for safe operation and shutdown of the plant.
8701200441 870106 PDR ADOCK 05000445 S
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TXX-6201 January 6, 1987 Page 2 of 2 CORRECTIVE ACTION The CTHs of both units have been subjected to an as-built program. The CTHs without thermolag have been visually examined and the locations where this condition has occurred are noted on the as-built drawings.
Each condition will be repaired in accordance with established project procedures.
To determine where splice welds may exist in Unit 1 CTHs which are covered with fire protection material (thermolag, thermoblanket), the as-built CTH drawings will be reviewed and those having full or partial fire protection will be identified. CTHs will be checked in cases where the absence or presence of a splice can be identified without the removal of fire protection material. Other CTHs will have fire protection material removed to the extent required.to confirm the presence or absence of a splice. CTHs with identified splices will be repaired in accordance with established site procedures.
We anticipate subnitting our next report no later than April 3, 1987.
Very truly yours, h
cnd G. S. Keeley &
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Manager,Nuclearycensing DAR/grr c - U. S. Region IV (0 + 1 copy)
Director, Inspection and Enforcement (15 copies)
U. S. Nuclear Regulatory Commission Washington, D.C.
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