ML20112G301
| ML20112G301 | |
| Person / Time | |
|---|---|
| Site: | Hatch  |
| Issue date: | 12/14/1984 |
| From: | Gucwa L GEORGIA POWER CO. |
| To: | James O'Reilly, Oreily J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| IEB-83-08, IEB-83-8, NED-84-481, NUDOCS 8501160283 | |
| Download: ML20112G301 (2) | |
Text
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Georgh Power Company 333 Piedmont Avenue Atlanta, Georgia 30308 Telephone 404 526 6526 '
Maihng Address.
' Post Off;ce Box 4545' Attanta. Geofgia 30302 y gc2B P l : 26 Georgia Power L. T. Gucwa the sca!vm entre 5ygrem
- Manager Nuclear f~ngineering and. chief Nuclear Engineer Decenter 14, 1984 NED-84-481 4
~
U. S. Maclear Reg 21atory n=mnission
REFERENCE:
Office of Inspection and Enforcement RII: JPO Region ~II - Saite 2900 50-321/50-366 101 Marietta Street, NW ISE B211etin Atlanta, Georgia 30323 83-08, Final Response ATIDrrION: Mr. James P. O'Reilly GENITREN:
On April 2, 1984 and anne 21, 1984, Georgia Power Company (GPC) sutaitted infonnation related to electrical cira2it breakers with an undervoltage trip attachment (UVTA) in safety related applications.
We response of April 2 provided all remested information except responses that remired infonnation from vendors. %e response of aine 21 provided vendor design data for General Electric (GE) F225 Line Molded Case Ciro2it Breakers, j and stated that we would supply a similar response for the Westinghouse 50 EHP250 Air Cira11t Breaker in December, 1984.
%is letter fulfills aar comunitment for the December letter, and no further response to I&E R111etin 83-08 is planned.
We have learned from Westinghouse that they do not have information from -
which the " design margin" which you reasested could be obtained.
In response to repeated remests for mich information,' Westinghouse recently
. provided ' a commercial proposal for a - test program to determine. the '
" actual margin" of the force applied by the device over the force remired to trip the breaker.
GPC has reviewed the proposal and feels that the testing program is not justified by the potential benefit.
In lies of a response to westion 2a of I&E Rallatin 83-08 for the sabject Westinghanse circuit breakers, GPC mataits the following:
1)
Se UVms in mestion are not the primary means for ' tripping the breaker-for load shedding following a loss of off-site power (IDSP).
Rather, they are a back-tip to a shant trip attachment which ' is activated by, redundant undervoltage relays and powered from 125 volt DC ~ control power.
%e UVrA would be needed only in the unlikely event of a IDSP conmarrent with a failure of the DC has.
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o s Srn 1
-GeorgiaPower sk U. S. Riclear Regulatory Conmission Office of Inspection and Enforcement Region II - atite 2900 December 14, 1984 Page 'Dvo
- 2) GPC will implement periodic testing of the INTAs on the albject Westinghouse 50 DHP250 breakers in conjunction with the existirg Plant Breaker Preventive Maintenance Program.
INTAs are not alrrently addressed by that program.
- 3) h most recent Westinghouse and INPO reconenendations for Jubrication and maintenance of circuit breakers have been reviewed against current plant procedires.
While existing procedires are adecalate, a few minor revisions will be made based on that review.
Items 2 and 3 will be completed as soon as practical, hit no later than March 31,1985.
Please contact Mr. Pall Springer at (404) 526-7010 if yal have any glestions.
Very truly yours, W N $"
L. T.
Q1 cwa PIS/
xc:
H. C. Nix, Jr.
Senior Resident Inspector 700775