ML20236U185
| ML20236U185 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 11/20/1987 |
| From: | Nauman D SOUTH CAROLINA ELECTRIC & GAS CO. |
| To: | Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| IEB-85-003, IEB-85-3, NUDOCS 8712020341 | |
| Download: ML20236U185 (16) | |
Text
-_-
South C:rolin3 E!octric & Gas Company Dan A. NIuman P.O. Box 764 Vre Precident Columbia, SC 29218 Nuclear Operations (803) 748-3513 SCE&G November 20, 1987 l
37 "
" C: 20 I
Dr. J. Nelson Grace Regional Administrator U. S. Nuclear Regulatory Commission Suite 2900 l
101 Marietta Street, NW f
Atlanta, GA 30233
Subject:
Virgil C. Summer Nuclear Station Docket No. 50/395 Operating License No. NPF-12 Response to Valve Design Basis for IEB 85-03
Dear Dr. Grace:
l This letter forwards the design basis information for seventeen valves being i
added to the IEB 85-03 program, " Motor Operated Valves Common Mode Failures During Plant Transients Due to Improper Switch Settings," as committed to in our letter of September 17, 1987.
Upon further review, two valves, XVG-8884-SI and XVG-8886-SI have been added to the program in addition to the fifteen valves identified in your letter of August 18, 1987. This information satisfies the requirements of Action a. identifed in the IEB.
J Should you have any questions, please call a your convenience.
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0.W. Dixon, Jr./T. C. Nichols, Jr.
M. R. Hazel E. C. Roberts C. L. Ligon
- 0. S. Bradham R. M. Campbell
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D. R. Moore K. E. Nodland i
W. A. Williams, Jr.
J. C. Snelson l
l Group Managers G. O. Percival W. R. Baehr R. L. Prevatte C. A. Price J. B. Knotts, Jr.
R. B. Clary NPCF W. R. Higgins RTS W. T. Frady File M. D. Blue Qf O 871120 G
05000395 PDR i
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DEFINITIONS AP Differential Pressure EFW Emergency Feedwater E0P Emergency Operating Procedure gpm Gallons Per Minute psid Pounds Per Square Inch-Differential psig Pounds Per Square Inch-Gage f
RCS Reactor Coolant System SI Safety Injection VCT Volume Control Tank NOTE:
Line loss and losses associated with flow path components are neglected in maximum differential pressure development.
Thus, the maximum differential pressures calculated result in conservative values.
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l Valve Tag No.:
XVG-8130A,B-CS J
Valve
Description:
Charging Pumps Suction Crossover Line
]
Normal Position:
Open j
Valve Type:
8" Gate i
i 1.
Design Basis for Valve-Valves are normally aligned open to provide water to the charging pumps, and this-alignment is correct for'the safety. injection function so the valves do not have to change position. These valves do not receive an SI signal. The operator will close one pair of the 8130 or 8131 valves for switchover to cold leg recirculation per the E0Ps.
i 1
The AP.across these valves is from the'VCT to the charging pumps suction. The VCT is located at elevation 463' with a maximum overgas pressure of 75 psig. The valves are at. elevation 388' in the suction i
header. Assuming eight feet of water in the VCT and zero psig in the pump suction lines gives a AP of 111 psig.
2.
. Design Conditions:
Opening 220/250
)
Closing 220/250 4
3.
Operating Conditions:
l Normal Operation Abnormal Operation Max AP (osid)/ Temp (*F)
Max AP (psid)/ Temp (*F)
Opening N/A*
111/115 Closing 111/115 N/A*
- Valve operation in this direction is neither required nor desired.
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Valve Tag No.:
XVG-8131A.B-CS Valve
Description:
Charging Pumps Suction Crossover Line Normal Position:
Open Valve Type:
8" Gate 1.
Design Basis for Valve:
Valves-are normally aligned open to provide water to the charging purnps, j
and this alignment is correct for the' safety injection' function so the valves do not have to change position.. These valves do not receive an' j
SI signal. The operator will close;one pair of the 8130 or 8131. valves for switchover to cold leg recirculation per the E0Ps.
1 The AP across these valves is from the VCT to the charging pumps suction. The VCT is located at elevation 463'.with a maximum overgas
' pressure of 75 psig. The valves are at elevation ~388in the suction-header. Assuming eight feet of water.in the VCT and zero psig in the:
1 pump suction lines gives a AP of 111' psig.
I 2.
Design Conditions:
Max AP (osid)/Temo (*F)
Opening 220/250 Closing 220/250 3.
Operating Conditions:
Normal Operation.
Abnormal Operation Max AP (osid)/Temo (*F)
Max 6P (esid)/Temo (*F)'
q Opening N/A*
111/115 Closing 111/115 N/A*
- Valve operation in this direction is neither required nor desired, l
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Valve Tag No.:
XVG-8106-CS l
Valve
Description:
Charging Pumps Miniflow Isolation Normal Position:
As Noted Valve Type:
-3" Gate 1.
Design Basis for Valve:
i Current mode of operation requires the operator to open and close this valve as a backup to valves 8109A,B,C.
This valve discharges to the VCT so its backpressure is equal to VCT pressure. Since the suction pressure on the charging pumps is also-equal to VCT pressure, the AP across the' valve is equal to the, charging pumps' shut-off head.
2.
Design Conditions:
Max AP (psid)/ Temp (*F)~
Opening 2735/250 Closing 2735/250 3.
Operating Conditions:
Normal Operation Abnormal Operation Max AP(psid)/Temo (*F)
Max AP(psid)/Temo (*F)
Opening 2350*/130.
2647/130 Closing 2350*/130 2647/130 Per Westinghouse line specification.
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Valve Tag No.:-
XVT-8109A,B,C-CS.
Valve
Description:
Charging Pumps Miniflow Isolation Normal Position:
'As Noted
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Valve Type:
2" Globe 1.
Design Basis for Valve:
Current mode of operation requires the operator to open and close these 4
valves depending on RCS pressure and SI flowrate. When required, these l
valves must be closed to allow adequate flow to the RCS, or opened to-1 allow miniflow to protect the pumps if charging flowrate is
.j
" deadheaded".
j The miniflow valves are at approximately the same elevation as the charging pumps and discharge to the VCT. Thus, the. backpressure on the miniflow valves is equal to VCT pressure. The suction pressure on the charging pumps is also equal to VCT pressure so the piessures cancel, and the AP will be equal to the shut-off head of-the charging pumps.
2.
Design Conditions:
Max AP (psid)/Temo (*F)
Opening 2735/250 Closing 2735/250 3.
Operating Conditions:
Normal Operation Abnormal Operation Max AP (osid)/Temo (*F)
Max AP (psid)/Temo (*F)
Opening 2350*/130 2647/130 Closing 2350*/130 2647/130 Per Westinghouse line specification.
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I Valve Tag No.:
XVG-8132A,8-CS
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Valve
Description:
Charging Pumps Discharge Crossover Line Normal Position:
Open
- l Valve Type:
4" Gate t
1.
Design Basis for Valve:
Valves are normally aligned open. This alignment is correct for the SI l
function so the valves do not have to change position. Valves do not receive an SI signal.
j
~However, valves must be able to be re-opened if they are inadvertently closed. Per the E0Ps, one pair of valves (8132A,B or 8133A,B) will be closed by the operator on establishing cold leg recirculation.
)
The maximum operating AP is due to a VCT relief valve setpoint of 75 psig, plus 2647 psi charging pump shutoff head, plus the elevation difference between the RCS pressure transmitters at elevation 412', and the VCT at elevation 463', plus eight feet of water in the VCT (net of 26 psi), less the minimum RCS pressure for safety injection of 500 psig.
i 2.
Design Conditions:
Max AP (psid)/ Temp (*F)
Opening 2800/200*
Closing 2800/200*
l Ref. Westinghouse line specification.
)
3.
Operating Conditions:
Normal Operation Abnormal Operation Max AP (psid)/ Temp (*F)
Max AP (psid)/Temo (*F)
]
Opening N/A*
2248/130' Closing 2248/130 N/A*
- Valve operation in this direction is neither required nor desired.
o Valve. Tag No.:
XVG-8133A,B-CS Valve
Description:
Charging Pumps Discharge Crossover Line Normal Position:
Open Valve Type:
4" Gate
.I 1.
Design Basis for Valve:.
Valves are normally aligned open. This alignment is correct ~for the SI function so the valves do not have to change position. Valves do not.
- receive an SI signal.
However, valves must be able to be re-opened if they are inadvertently' N
closed.. Per the E0Ps, one pair of valves (8132A,B or 8133A,B) will.be closed by the operator.on establishing cold leg recirculation.
l I
The maximum operating AP is due to a VCT relief valve:.setpoint of 75 psig, plus 2647 psi charging pump shutoff head, plus.the elevation difference between the RCS pressure transmitters at elevation 412, and the VCT at elevation 463', plus eight feet of water in the VCT-(net of 26 psi)', less the minimum RCS pressure for safety injection of.500 psig.
2.
Design Conditions:
l Max AP (psid)/Temo (*F)
Opening 2800/200*
Closing 2800/200*
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Ref. Westinghouse line specification.
1 3.
Operating Conditions:
)
Normal Operation Abnormal Operation j
Max AP (psid)/ Temp (*F)
Max AP (psid)/Temo ("F) j Opening N/A*
2248/130 Closing 2248/130
'N/A*
l
- Valve operation in this direction is neither required nor desired.
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Valve Tag No.:
XVG-8884, 8885,_8886-SI Valve
Description:
High Head Safety Injection Isolation Valves Normal Position:
Closed
' Valve Type:
3" Gate, flexible ~ wedge'.
1.
Design Basis for Valve:
Tnese valves isolate the charging pump discharge header from the RCS during normal plant operation. XVG-8885 provides a path to~the cold leg
. injection points parallel.to XVG-8801A,B..XVG-8885 is open for cold leg recirculation; XVG-8884 and 8886 provide parallel paths from each of the charging pump discharge headers to the hot leg injection points.
XVG--
8884 and 8886 are closed during safety injection and cold leg q
recirculation and opened for hot leg recirculation. None of these valves are actuated by a SI signal nor any other emergency actuation-signal.
The maximum operating AP.is due to a VCT' relief valve setpoint'of 75 psig, plus 2647 psi charging pump shutoff head, plus the elevation difference between the RCS pressure transmitters at elevation 412' end the VCT at' elevation 463', plus eight feet of water in the VCT (net of 26 psi), less the minimum RCS pressure for safety injection of 500 psig.
2.
Design Conditions:
Max AP (psid)/Temo (*F)
Opening 2750/650 Closing 2750/650 3.
Operating Conditions:
Normal Operation Abnormal Operation Max AP (psid)/Temo (*F)
Max AP (psid)/Temo (*F)
Opening 2248/130 N/A*
Closing 2248/130 2248/130
- Valve operation in this direction is neither required nor desired.
f
Valve Tag No.:
XVG-2802A,8-MS Valve
Description:
Steam Supply to EFW Turbine Horinal Position:
Open Valve Type:
4" Gate 1.
Design Basis for Valve:
Valves are normally'open; therefore, for turbine driven EFW pump start, valve movement is not required. However, if one or both of the valves were inadvertently closed before or during' accident mitigation, they-would have to be reopened.
If only one valve had been closed, the AP would be small due to backpressure from the other line.
If t,oth valves had been closed, the AP would then be equal to main steam pressure.-
1 The maximum AP is based on the highest setting of'the main steam relief valves and therefore represents the highest possible main steam pressure.
2.
Design Conditions:
i Opening 1284/600 j
Closing 1284/600 Ref. Westinghouse line specification.
3.
Operating Conditions:
Normal Operation Abnormal Operation Max AP (psid)/Temo (*F)
Max AP (osid)/Temo (*F)
Opening N/A*
1235/573 Closing N/A*
N/A*
- Valve oporation in this direction is neither required _nor desired.
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