ML20093D083
| ML20093D083 | |
| Person / Time | |
|---|---|
| Site: | Hatch  |
| Issue date: | 06/21/1984 |
| From: | Gucwa L GEORGIA POWER CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| IEB-83-08, IEB-83-8, NED-84-337, NUDOCS 8407160113 | |
| Download: ML20093D083 (2) | |
Text
n ' D Gergia Power Cortpany 333 Piedmont Avenue Attar.ta. Georg a 30308 r
Telephone 404 526 6526 MaAng A#en Post Off:ce Box 4545 A::anta, Georg:a 30302 h
.2 n0: 58 Georgia Power L T. Gucwa rne scart.,m e mc sprem u
Manager Nuclear Engineer:ng at Chief Nuciear Eng:neer NED-84-337 June 21, 1984 U. S. Nuclear Regulatory Cannission
REFERENCE:
Office of Inspection and Enforcenent RII: JPO Region II - Suite 2900 50-321/50-366 101 Marietta Street, W I&E Bulletin Atlanta, Georgia 30323 83-08, Supplenental Response ATTENTION: Mr. Janes P. O'Reilly GENTLEMEN:
On April 2,1984, Georgia Power Canpany (GPC) subrnitted our response to I&E Bulletin 83-08, " Electrical Circuit Breakers with an Undervoltage Trip Feature in Use in Safety-Related Applications Other than the Reactor Trip Systen." We could not respond to Section 2.a of the bulletin because the requested design and maintenance information had not been received fran the breaker manufacturers. We have since received the requested information for General Electric F225 Line Molded Case Circuit Breakers.
Westinghouse has indicated that the information cannot be provided until Novenber,1984. GPC will provide a supplenental response in Decenber, 1984 to describe the Westinghouse response.
The following is our response to Section 2.a for the GE circuit breakers:
Question: 2.a For each circuit breaker type identified in Iten 1, do the following.
Review the design of the UVTA and the connecting linkage.
Using input fran the breaker manufacturer, determine the design margin available to open the breaker. Evaluate whether or not this design margin is adequate in view of safety applications, considering possible problens of alignnent, lubrication, adjustment of spring tension, etc., discussed in the " Description of Circunstances."
RESPONSE
General Electric F225 Line Molded Case Circuit nreakers GE has provided the following information relative. to the design of the subject circuit breakers.
1.
Force re3uired to release the latch: 5-10 ounces.
8407160113 840621 I h PDR ADOCK 05000321 fsff O
iC b
Georgia Power b U. S. Nuclear Regulatcry Ccarnission Office of Inspection and Enforcenent Region II - Suite 2900 June 21, 1984 Page 'IWo RESPONSE (Continued):
2.
Spring force available to release latch:
minimun 1.5 pounds, maximun 5 pounds.
3.
Force provided by UV device to trip breaker: 5 pounds.
4.
Force required to trip breaker:
2.5 pounds.
These data are representative of tests on new devices.
Based on the data supplied by GE, the margin available to open the breaker is 100%. We believe that this margin is adequate based on favorable operating experience to date.
As reported in the April 2 response, we have experienced no malfunctions of the subject breakers as a result of UVTA failures.
Since the case of the F225 breaker is factory sealed, there is no required internal maintenance and, therefore, no likelihood of problens due to improper aliganent, lubrication, adjustment,
- etc, discussed in the
" Description of Circunstances." GE reports that there is no chan9e in their reconnendation that there is no preventative maintenance progran reluired other than periodic testing to check for the desired performance.
Accordingly, GPC plans no change in existing maintenance and surveillance procedures for the F225 breakers.
As stated previously, we will supply a corresponding response for Westingbotse 50 DHP 250 breakers in Decenber,1984, after receipt of the Westingho.Ee data and reconnendations.
Please contact this office if you have any questions or cannents.
Very truly yours, j0fn LN w i
/g L. T. Gucwa PLSjhb xc:
J. T. Beckhan, Jr.
H. C. Nix, Jr.
Senior Resident Inspector runs