ML20041E496

Final Rept 82-02 Re High Pressure Core Spray Sys Switchgear, Initially Reported 820127.GE Has Supplied Mod Kits to Upgrade Existing Equipment to Rating of 80,000 Amp Momentary Short Circuit Current

ML20041E496
Person / Time
Site:	LaSalle, 05000375
Issue date:	03/05/1982
From:	Schroeder C COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
10CFR-050.55E, 10CFR-50.55E, 3581N, NUDOCS 8203110010
Download: ML20041E496 (2)

Text

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/CN Commonwealth Edison

/ One First N;tional Pl;za. Chic 3o, Illino s

( Q- ] Address Reply to: Post Othee Box 767

\ / Chicago. Illinois 60690 6

March 5, 1982

.9 Mr. James G. Keppler, Regional Administrator S. EO Directorate o f Inspection and 2 # M0J -

Enft cement - Region III .-

D 8 2 A .77 U.S. Nuclear Regulatory Commission Y 799 Roosevelt Road Glen Ellyn, IL 60137 4 N ru *

Subject:

LaSalle County Station Units 1 and 2 Division 3 HPCS Switchgear 10 CFR 50.55(e) Final Report #82-02 NRC Docket Nos. 50-373 and 50-374

Dear Mr. Keppler:

The Ccmmonwealth Edison Company notified ycur o f fice on Janua ry 27, 1982, o f a possible reportable deficient y on the switchgear equipment that is used on the Hign Pressure Core Spray System a t LaSalle County Station. That notification was made in accordance with 10 CFR 50.55(e).

Description o f Deficiency LaSalle County Station has General Electric's Vertical Lif t Metal-Clad Switchgear Equipment, Model 4.16-350 that is used on the High Pressure Core Spray System. This switchgear is rated at 78,000 amps momentary short circuit current. General Electric has indicated that recent tests have shown that bt.3 support dielectric damage can occur with momentary currents above 66,000 amps.

Corrective Action General Electric has modification kits available for upgrading the existing equipment to a rating o f 80,000 amp momentary short circuit current. The kit consists o f:

1. Additional supports to some main bus arrangements.

2. Stif fer supports at rear end o f current transfor-mer runback supports.

3. Additional supports at front end a f C.T. runback bars.

8203110010 820305 PDR ADOCK 05000373 MAR 8 G824 S PDR EJNI '

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J. G. Keppler March 5, 1982 o

For Unit 1, all of the material included in the modification kits has been received at LaSalle County Station. General Electric will De handling the installation o f the modification via on FDDR #HAl-1523. The work is scheduled to begin the week o f 3-8-82. Total time for completion should not De more tnan 1 week. The modification will not change any o f the original documentation approved for this equipment. Fo r Unit 2, the modification will be completed prior to Unit 2 Fuel Load.

Please address any further questions concerning this matter to this office.

Very truly yours, DA sIsht-C. W. Schroeder Nuclear Licensing Administrator 1m cc: Director Of Inspection a Enforcement - Wash.

Region Ili Inspecto r - L3CS 3581N