TXX-6103, Interim Deficiency Rept CP-86-77 Re Spec of Min Wall Thickness in Instrument Tubing.Initially Reported on 861021. Spec 2323-MS-625 & Const Procedure ICP-4 Reviewed.Next Rept Anticipated by 870121
| ML20214J477 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 11/19/1986 |
| From: | Beck J, Counsil W TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | Johnson E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| CP-86-77, TXX-6103, NUDOCS 8612010325 | |
| Download: ML20214J477 (1) | |
Text
Log # TXX-6103 File # 10110 903.9 TEXAS UTILITIES GENERATING COMPANY SKYWAY TOWER. 4e9 NORTH Ot.IVE STREET. B B. 88. DAILAS. TEXAS 753ut November 19, 1986 b @ @ $ UU $_
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Mr. Eric H. Johnson, Director Division of Reactor Safety and Projects U. S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 1000 Arlington, TX 76011
SUBJECT:
COMANCHE PEAK STEAM ELECTRIC STATION (CPSES)
DOCKETS NOS. 50-445 AND 50-446 INSTRUMENT TUBING MINIMUM WALL THICKNESS SDAR: CP-86-77 (INTERIM REPORT)
Dear Mr. Johnson:
On October 21, 1986, we verbally notified your Mr. Ian Barnes of a deficiency involving specification of minimum wall thickness in instrument tuuing which may not meet the stress allowables required by the ASME B&PV Code,Section III. This is an interim report of a potentially reportable item under the provisions of 10CFR50.55(e).
A review of DCA 13346 to specification 2323-MS-625, " Instrument Tubing and Fittings", and construction procedure ICP-4, " Instrument Tubing Installation and Inspection" has identified a concern in that 0.035 inch wall thickness was approved for use in all instrument tubing sizes. For certain size tubing in high temperature and pressure reactor coolant applications, this wall thickness may be insufficient to meet ASME Code stress allowables.
We are continuing our evaluation of this issue and anticipate submitting our next report by January 21, 1987.
Very truly yours, W. G. Counsil By:
J.(/W. Beck Vice President Nuclear Engineering BSD/amb 8612010325 861119 PDR ADOCK 0500 5
s 1 b A D111N10N OF TEXA5 tTILITIFS FLFCTRIC COMPA%Y p 50 ss7
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