TXX-4982, Interim Deficiency Rept CP-86-53 Re Seismic Design of Conduit.Initially Reported on 860725.Program to Test Ability of Adhesives to Resist Torsional Moments Under Evaluation. Next Rept Will Be Submitted by 861021
| ML20212P656 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 08/22/1986 |
| From: | Counsil W, Keeley G TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | Johnson E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| CP-86-53, TXX-4982, TXXX-4982, NUDOCS 8609030224 | |
| Download: ML20212P656 (1) | |
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Log # TXX-4982 File # 10110 903.10 TEXAS UTILITIES GENERATING COMPANY SKYWAY TOWER
- 400 NORTM OtJVE STREET. I B. 88. DA1.LAS. TEXAa 76201 August 22, 1986
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t 4E 2 7i986 Mr. Eric H. Johnson, Director y
Division of Reactor Safety and Projects
,w,.. a U. S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 1000 Arlingtori, TX 76012
SUBJECT:
COMANCHE PEAK STEAM ELECTRIC STATION (CPSES)
DOCKET NOS. 50-445 AND 50-446 SEISMIC DESIGN OF CONDUIT SDAR: CP-86-53 (INTERIM REPORT)
Dear Mr. Johnson:
On July 25, 1986, we verbally notified your Mr. I. Barnes of a deficiency involving the seismic design of conduit. This is an interim report of a potentially reportable item under the provisions of 10CFR50.55(e).
This deficiency occurs whenever a conduit changes direction and terminates in an airdrop with no support provided between the change in direction and the airdrop and a coupling is present prior to the change. During a seismic event, the unsupported portion of the conduit places a torsional moment at the coupling. The inability of the coupling to resist the torsional moment may result in significant motions at the free end of the conduit which would be resisted by the cable. The cable has not been designed for the loads imposed by such motion.
EBASCO is presently evaluating a test program to test the ability of adhesives, applied after the conduit was installed, to resist torsional moments. We are continuing our evaluation and anticipate submitting our next report by October 21, 1986.
Very truly yours, W54 b W. G. Counsil By:
A.
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G.S. Keeley M'-
Manager, Nuclear Lic4fising JCH/amb 8609030224 860022 PDR ADOCK 05000445 S
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