TXX-4005, Deficiency Rept Re Bolting Matl Used for Cable Tray Clamps. Structural Drawings Specify High Strength Bolting Matls. Bolts Used Were Mild Steel Type.Design Change Issued. Rework Performed as Required

Deficiency Rept Re Bolting Matl Used for Cable Tray Clamps. Structural Drawings Specify High Strength Bolting Matls. Bolts Used Were Mild Steel Type.Design Change Issued. Rework Performed as Required

ML20077A265
Person / Time
Site:	Comanche Peak
Issue date:	07/12/1983
From:	Spence M TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:	Madsen G NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
10CFR-050.55E, 10CFR-50.55E, TXX-4005, NUDOCS 8307220259
Download: ML20077A265 (2)

Text

---

,, w o .

TENAS UTII.ITIES GENERATING CO.TiinNY 2001 IIT4YAN TOWEll

• DALLARTEXAM 76201 4 5 b$ 5 $ $

"**'.I,Pi2T'"*' s JUL I 51983 Mr. G. L. Madsen, Chief ~~

W/

~ ~ '

Reactor Project Branch 1 U. S. Nuclear Regulatory Commission Office of Inspection and Enforcement 611 Ryan Plaza Drive, Suite 1000 Docket Nos.: 50-445 Arlington, TX 76012 50-446 COMANCHE PEAK STEAM ELECTRIC STATION CABLE TRAY CLAMPS QA FILE: CP-83-15, SDAR-115 FILE N0.: 10110

Dear Mr. Madsen:

In accordance with 10CFR50.55(e), we are submitting the enclosed report of actions taken to correct a deficiency regarding the bolting material used for cable tray clamps.

Supporting documentation is available at the CPSES site for your Inspector's review.

Very truly yours, 4 C c .

MDS:ln Enclosure cc: NRC Region IV - (0 + 1 copy)

Director, Inspection & Enforcement (15 copies)

U. S. Nuclear Regulatory Commission Washington, DC 20555

!J 8307220259 830712 PDR ADOCK 05000445

'l.5 8 7 S PDR g

. 6 TXX-400,5 July 13, 1983 ATTACHMENT CABLE TRAY CLAMPS Description of the Deficiency The structural drawing showing the attachment of cable tray to the associated supports requires the use of high strength (ASTM A-325) bolting materials. Per the construction specification 2323-SS-16B, high strength bolts are to be torqued to a specific value based on bolt size and material. A field review of installed conditions revealed that the bolts used were mild steel type (ASTM A-307).

This type of bolting material is not acceptable per the design detail requirements. The design calculations indicate high strength bolting material is required for supports utilizing heavy -duty cable tray clamps.

Safety Impact In the event the deficiency had gone undetected, the capability of the heavy-duty clamps in combination with mild steel bolting material could not have been assured under maximum design loading conditions.

Corrective Action Further review of the calculations has indicated mild steel bolting material is acceptable for regular cable tray support clamps. A design change has been issued to recognize the acceptability of these applications. For supports requiring heavy-duty cable tray clamps, the bolting material and torque will be verified by site quality control. Rework will be performed as required. Future installations will be performed and inspected in strict accordance with the design requirements.

_ _ . - . .. .