ML20215K670
| ML20215K670 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 10/15/1986 |
| From: | Conway R GEORGIA POWER CO. |
| To: | Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| GL-1122, IEB-85-001, IEB-85-1, NUDOCS 8610280251 | |
| Download: ML20215K670 (3) | |
Text
-
Gepa.a Power Cuncany 3H Pecmor! As r'ue Ana~a Gemya 30308 Te C;tme 404 526 6724 t,'z, ono Arforess Pr.10%ce Bo= 4545 BB 0Ci 21 A9
}8
^ * " " " " "
y e uw.ero en tr<. system R.E.Conway s-tm o:
- 4. ot n
October 15, 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-1122 Attention: Mr. J. Nelson Grace The attached information is submitted in response to I&E Bulletin 85-01, " Steam Binding of Auxiliary Feedwater Pumps," for the Vogtle Electric Generating Plant.
This response contains no proprietary information and may be placed in the NRC Public Document Room.
Yours truly, R. E. Conway REF/ REC /tdm Attachment l
l 8610280251 861015 PDR ADOCK 05000424 G
PDR I
I
Page Two R. E. Conway states that he is the Senior Vice President, Project Director of the Vogtle Project 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 /I of October,1986.
f' dw k. ks!; e W MyCommissionexpir'es6/1d0 xc:
U. S. Nuclear Regulatory Commission Document Control Desk Washington, D. C.
20555 H. G. Baker R. A. Thomas L. T. Gucwa J. P. O'Reilly D. R. Altman C. W. Hayes G. F. Head P. R. Bemis G. A. McCarley R. E. Conway J. A. Bailey R. W. McManus J. T. Beckham
- 0. Batum D. S. Read R. H. Pinson G. Bockhold Sr. Resident (NRC)
P. D. Rice C. E. Belflower C. C. Garrett (OPC)
B. M. Guthrie J. F. D'Amico J. E. Joiner (TSLA)
D. E. Dutton E. D. Groover D. Feig (GANE)
~
VEGP Response to USNRC IE Bulletin 85-01
" Steam Binding of Auxiliary Feedwater Pumps" This bulletin addresses licensee actions required to provide assurance that PWR Auxiliary Feedwater (AFW) systems do not become inoperable due to steam binding during times when the system is required to be operable.
Steam binding of the AFW system pumps is.not anticipated to be a problem for VEGP's Units 1 and 2 because of the following design features:
1.
Each AFW discharge line is provided with three check valves between the pump discharge and the connection to the main feedwater (MFW) line.
The two stop check valves located near the MFW line are of the globe style plug type.
Minimum leakage is expected through these valves due to the positive seating provided by the vertical downward travel of the valve plug at no flow condition.
The third check valve located near the AFW pump is of the swing check type.
The disc construction of this type of check valve might not seat properly under low differential pressure condition and is susceptible to leakage.
2.
The suction lines of the three AFW pumps are not cross cdnnected.
Each AFW pump has a separate suction line from the condensate storage tank (CST).
Therefore, backleakage through the discharge check valve of one train would not impact the suction lines of the other -trains.
In addition, relief valves have been added to the suction piping of the AFW pumps to protect it from potential overpressurization.
3.
To detect potential leakage across these check valves, each of the AFW discharge lines is provided with a temperature sensing element that provides input to the Emergency Response Facility Computer (ERFC).
Monitoring AFW system fluid conditions during times when AFW is required to be operable will be accomplished as part of the operator daily rounds.
AFW pump suction and discharge piping will be checked for temperature by touch once every 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> as a minimum when AFW is required to be operable.
Operations Department l
Outside Area Rounds Sheet Draft Procedure (11,882-C) will be revised to incorporate AFW temperature monitoring and will be implemented prior to Unit 1 initial criticality.
Symptoms of AFW steam binding and corrective actions to restore the AFW system to operational status following steam binding are addressed in Plant Standard Operating Procedure (S0P),13610 Revision 1, " Auxiliary Feedwater System".
This procedure is currently in effect and will be implemented for Unit 1 at initial fuel load.
VEGP non-licensed operators receive training on steam binding of AFW recognition and recovery actions in lesson plan NL-LP-236C, which was implemented in the training program in July 1986.
Licensed Operators receive AFW system steam binding i
training in lesson plan LO-LP-20101-C, which was implemented March 1985.
l i
l
.