ML20214K141
| ML20214K141 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 11/11/1986 |
| From: | Rice P GEORGIA POWER CO. |
| To: | Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| GN-1173, IEB-86-003, IEB-86-3, NUDOCS 8612020180 | |
| Download: ML20214K141 (2) | |
Text
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Georg:a Power Company Post Office Box 282 0'
Waynesboro, Georg a 30830 Telephone 404 SM9961. Ext c=% 3413 404 724-8114 Ext. PM OS N0y 18 gll pu Georgia Power P.D. mce y,Pr;g;f w-November 11, 1986 United States Nuclear Regulatory Commission
Reference:
Region II RII:
JNG:
Suite 2900 50-424 101 Marietta Street, Northwest 50-425 Atlanta, Georgia 30323 File: X7BC24 Log:
GN-1173 Attention: Mr. J. Nelson Grace Georgia Power Company has evaluated I&E Bulletin 86-03, " Potential Failure of Multiple ECCS Pumps Due to Single Failure of Air-0perated Valve in Minimum Flow Recirculation Line," to determine whether a single-failure vulnerability exists in the minimum flow recirculation line of
- < Emergency Core Cooling System (ECCS) pump that could cause a failure of more than one ECCS train.
Our evaluation has concluded that the concerns of the Bulletin are not applicable to the Vogtle Electric Generating Plant.
The only Vogtle ECCS components that share common minimum flow recirculation lines and/or valves are the Safety Injection System (SIS) and the Chemical Volume and Control System (CVCS).
The SIS has miniflow return lines to the Refueling Water Storage Tank (RWST).
The lines become common after the pressure-breakdown orifices for each pump.
The
. individual portions of the miniflow lines contain an isolatinn valve each, and the common portion contains a single valve.
All of these valves are motor operated and as such are fail-as-is upon loss of control circuitry or power.
The CVCS minimum recirculation normal flow paths connect to a common line that contains a single motor operated isolation valve that is also fail-as-is upon loss of power.
On a safety injection signal, the CVCS pump miniflow paths automatically align to alternate miniflow paths which have no common valves.
This response contains no proprietary information and may be placed in the USNRC Public Document Room.
Yours truly, P. D. Rice REF/PDR/tdm c6120201eo e61111 PDR ADOCK 05000424 e
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Page Two P. D. Rice states that he is the Vice President-Vogtle Project Engineering and is authorized to execute this oath on behalf of Georgia Power Company and that to the best of his knowledge and. belief the facts set forth in this letter are true.
GPC:
Sworn to and subscribed before me this // a of November, 1986.
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V My Commission exfires #16/90 xc:
U. S. Nuclear Regulatory Commission Document Control Desk Washington, D. C.
20555 H. G. Baker D. R. Altman L. T. Gucwa J. P. O'Reilly P. R. Bemis C. W. Hayes G. F. Head J. A. Bailey G. A. McCarley i
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- 0. Batum R. W. McManus R. H. Pinson G. Bockhold Sr. Resident (NRC) l P. D. Rice C. E. Belflower C. C. Garrett (0PC)
B. M. Guthrie J. F. D'Amico J. E. Joiner (TSLA) l D. E. Dutton W. D. Drinkard D. Feig (GANE)
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