TXX-4633, Part 21 & Deficiency Rept SDAR-202 Re Adequacy of Flux Mapping Sys Seal Table Restraints Under Seismic Loads. Westinghouse Reviewing Site Engineering Comments Re Mods to Sys.Review of Comments & Mods Will Be Completed by 860331
| ML20138K254 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 11/26/1985 |
| From: | Counsil W TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | Johnson E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| REF-PT21-86-053-000 PT21-86-053-000, PT21-86-53, SDAR-202, TXX-4633, NUDOCS 8512180331 | |
| Download: ML20138K254 (2) | |
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m-Log # TXX-4633 TEXAS UTILITIES GENERATING COMPANY Fi1e # 10110 SKYWAY TOWER. 400 NORTH OLIVE STREET. L.B. 8 8 = DALLAS. TEXAS 78301
=EUS?Se"=7EE November 26, 1985 M@B OW2 %
Mr. Eric H. Johnson, Acting Director DEC - 9 585 tif Division of Reactor Safety and Projects U.S. Nuclear Regulatory Commission
--U 611 Ryan Plaza Drive, Suite 1000 J-Arlington, TX 76012
SUBJECT:
COMANCHE PEAK STEAM ELECTRIC STATION DOCKET N05. 50-445 AND 50-446 FLUX MAPPING SEAL TABLE RESTRAINTS QA FILE: CP-85-40, SDAR-202
Dear Mr. Johnson:
In accordance with 10CFR50.55(e), we are submitting the enclosed written report of actions taken to correct a deficiency regarding the adequacy of restraints (provided for the flux mapping system) under seismic loads.
Supporting documentation is available at the CPSES site for your Inspector's review.
Very truly yours,
(
W. G. Counsil JCH/grr Attachment c-NRC Region IV (0 + 1 copy)
Director, Inspection & Enforcement (15 copies)
U. S. Nuclear Regulatory Commission Washington, D.C.
20555 8512180331 851126 PDR ADOCK 05000445 S
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A suvsSzoN OF TEXAS UTsLETTES ELECTRIC COMPANY
r ATTACHMENT FLUX MAPPING SEAL TABLE RESTRAINTS
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DESCRIPTION-The NSSS Supplier (Westinghouse) has advised of a possible system interaction involving the Flux Mapping System (FMS) and the Seal Table / Bottom-Mounted Instrumentation.
Specifically, portions of the FMS which are designed and fabricated non-safety related are located directly above the seal table. The seal table is the pressure boundary. Failure of non-safety portions of the FMS or parts thereof falling on the seal table could result in a breach of the pressure boundary.
Review by the NSSS Supplier has confirmed the FMS restraints are inadequate
-for the seismic loads postulated for a seismic event.
SAFETY IMPLICATION In the event the condition had remained undetected, the potential exists for a small break loss of coolant accident.
CORRECTIVE ACTION A detailed analysis has been performed which indicates adequate restraint can be provided for the FMS. Currently, the Supplier is reviewing comments to the proposed modifications provided by site engineering. The resolution of these comments and actual modifications to the FMS are expected to be completed March 31, 1986.