ML16207A683
Text
STPEGS UFSAR Revision 18 NOTES TO FIGURE 6.3-5 (Sheet 1 of 8)
The system operating conditions presented for both the injection and the recirculation modes are based on the assumption that the Reactor Coolant System and the Containment are in equilibrium at zero psid. The performance reported for the pumping system assumes the accumulators are fully discharged and depressurized to zero psid. An estimate of the Containment spray pump flow is included in the process conditions presented for the suction piping from the refueling water storage tank and the Containment sump, since these lines are shared by the Containment Spray System.
The residual heat removal pumps shown on the process flow diagram are not used for safety injection. The process conditions associated with Residual Heat Removal System operation (location numbers 100 through 110) are presented in the notes to Figure 5.4-7.
MODES OF OPERATION
Mode A: Injection Phases
The low head and high head safety injection pumps take suction from the refueling water storage tank and deliver coolant into the reactor through the cold leg connections. This mode of operation is also representative of the flow verification testing that is performed on the system prior to initial plant startup (the system parameters listed are the expected values, not the minimum acceptable values).
Mode B: Cold Leg Recirculation
The low head and high head safety injection pumps take suction from the containment sump and deliver coolant into the reactor through the cold leg connections. The process conditions are based on the following assumptions:
- 1. The water in the refueling water storage tank has been injected and all three subsystems have realigned to take suction from the Containment sump.
- 2. The sump water is at saturation conditions.
Mode C: Hot Leg Recirculation
Same as Mode B except the delivery path to the reactor is through the Reactor Coolant System hot leg condition. It should be noted, however, that only two subsystems will be transferred while maintaining the third subsystem in Mode B.
STPEGS UFSAR Revision 18 NOTES TO FIGURE 6.3-5 (Sheet 2 of 8)
VALVE ALIGNMENT CHART Mode of Operation Valve Number A B C 1 O C C 2 O C C 3 O C C 4 C O O 5 C C O (C) 6 C C O (C) 7 O O C (O) 8 O O C (O)
- Train C valve alignments are given in parenthesis O = valve fully open C = valve fully closed STPEGS UFSAR Revision 18 NOTES TO FIGURE 6.3-5 (Sheet 3 of 8)
MODE A INJECTION PHASE (RUNOUT CONDITIONS FOLLOWING ACCUMULATOR DELIVERY)
Pressure Temperature Flow Location* Fluid psig (Max.) F gal/min(1) 1b/sec Volume gal 1 Refueling Water Atmospheric 100 -- -- 350,000 Minimum 2 " 100 21,900 3,021 -- 3 " 100 14,600 2,014 -- 4 " 4 psia 100 7,300 1,007 -- 5 " 3 psia 100 2,800(2) 386 -- 6 " 3 psia 100 1,600 221 -- 7 " 3 psia 100 2,900 400 -- 8 " 430 100 1,600 221 -- 9 " 80 100 1,600 221 -- 10 " 172 100 2,900 400 -- 11 " 72 100 2,900 400 -- 12 " <15 100 20 2.8 -- 13 " <15 100 100 13.8 -- 14 " <15 100 120 16.6 -- 15 " <15 100 220 30.4 -- 16 " <15 100 240 33.2 -- 17 " <15 100 340 47 -- 18 " <15 100 360 49.8 -- 19 Recirc. Coolant Containment Pressure Containment Temperature 0 0 --
- Location numbers 100 on the process flow diagram are used for RHR loop operation.
- 1. At reference conditions 100F and zero psig. 2. Containment spray flows listed represent a conservative estimate of maximum allowable pump runout flow.
STPEGS UFSAR Revision 18 NOTES TO FIGURE 6.3
-5 (Sheet 4 of 8)
MODE A INJECTION PHASE (RUNOUT CONDITIONS FOLLOWING ACCUMULATOR DELIVERY)
Pressure Temperature Flow Location* Fluid psig (Max.) F gal/min(1) 1b/sec Volume gal 20 Refueling Water <21 100 2,800 386 -- 21 Refueling Water <21 100 1,580 218 -- 22 Refueling Water 0 100 0 0 -- 23 Refueling Water 0 100 0 0 -- 24 Refueling Water 0 100 0 0 -- 25 Refueling Water 0 100 4,380 604 -- 26 N 2 0 100 0 0 -- 27 N 2 0 100 0 0 -- 28 N 2 0 100 0 0 -- 29 Recirc. Coolant Containment Pressure Containment Temperature
-- -- -- 30 Refueling Water 10 psia 100 2,900 400 -- 31 Refueling Water 10 psia 100 1,600 221 -- 32 Refueling Water 4 psia 100 2,900 400 -- 33 Refueling 4 psia 100 4,500 621 --
- Location numbers 100 on the process flow diagram are used for RHR loop operation.
- 1. At reference conditions 100F and zero psig.
STPEGS UFSAR Revision 18 NOTES TO FIGURE 6.3
-5 (Sheet 5 of 8)
MODE B COLD LEG RECIRCULATION Pressure Temperature Flow Location* Fluid psig (Max.) F gal/min(1) 1b/sec Volume gal 1 Refueling Water Atmospheric 100 -- -- <5,000 2 " Note 1 100 0 0 -- 3 " Note 1 100 0 0 -- 4 Recirc. Coolant 1.5 212 0 0 -- 5 " 0.5 212 2,800 373 -- 6 " 0.5 212 1,600 213 -- 7 " 0.5 212 2,900 386 -- 8 " 415 212 1,600 213 -- 9 " 65 212 1,600 213 -- 10 " 165 212 2,900 386 -- 11 " 65 212 2,900 386 -- 12 " 65 212 0 0 -- 13 " 65 212 0 0 -- 14 Refueling Water -- 100 0 0 -- 15 " -- 100 0 0 -- 16 " -- 100 0 0 -- 17 " -- 100 0 0 -- 18 " -- 100 0 0 -- 19 Recirc. -- 212 7,300 972 --
- Location numbers 100 on the process flow diagram are used for RHR loop operation.
- 1. At reference conditions 212F and zero psig.
STPEGS UFSAR Revision 18 NOTES TO FIGURE 6.3
-5 (Sheet 6 of 8)
MODE B COLD LEG RECIRCULATION Pressure Temperature Flow Location* Fluid psig (Max.) F gal/min(1) 1b/sec Volume gal 20 Recirc. Coolant <22 150 2,900 386 -- 21 " <22 212 1,600 213 -- 22 Refueling Water -- 100 0 0 -- 23 " -- 100 0 0 -- 24 " -- 100 0 0 -- 25 Recirc. Coolant 0 172 4,500 599 -- 26 N 2 0 Ambient 0 0 -- 27 " 0 Ambient 0 0 -- 28 " 0 Ambient 0 0 -- 29 Recirc. Coolant Containment Pressure 212 -- -- 350,00 30 " 7 212 2,900 386 -- 31 " 7 212 1,600 213 -- 32 " 1.5 212 4,400 586 -- 33 " 1.5 212 2,800 373 --
- Location numbers 100 on the process flow diagram are used for RHR loop operation.
- 1. At reference conditions 212F and zero psig.
STPEGS UFSAR Revision 18 NOTES TO FIGURE 6.3
-5 (Sheet 7 of 8)
MODE C HOT LEG RECIRCULATION (SUBSYSTEM A & B)**
Pressure Temperature Flow Location* Fluid psig (Max.) F gal/min(1) 1b/sec Volume gal 1 Refueling Water Atmospheric 100 -- -- <5,000 2 " 100 0 0 -- 3 " 100 0 0 -- 4 Recirc. Coolant 1.5 212 0 0 -- 5 " 0.5 212 2,800 373 -- 6 " 0.5 212 1,600 213 -- 7 " 0.5 212 2,900 386 -- 8 " 415 212 1,600 213 -- 9 " 65 212 1,600 213 -- 10 " 165 212 2,900 386 -- 11 " 65 212 29 00 386 -- 12 " 65 212 0 0 -- 13 " 65 212 0 0 -- 14 Refueling Water -- 100 0 0 -- 15 " -- 100 0 0 -- 16 " -- 100 0 0 -- 17 " -- 100 0 0 -- 18 " -- 100 0 0 --
- Location numbers 100 on the process flow diagram are used for RHR loop operation.
- The process conditions listed describe the hot leg recirculation for subsystems A & B. Subsystem C continues to operate in the cold leg recirculation mode.
- 1. At reference condition 212F and zero psig.
STPEGS UFSAR Revision 18 NOTES TO FIGURE 6.3
-5 (Sheet 8 of 8)
MODE C HOT LEG RECIRCULATION (SUBSYSTEM A & B)**
Pressure Temperature Flow Location* Fluid psig (Max.) F gal/min(1) 1b/sec Volume gal 19 Recirc. Coolant -- 212 7,300 972 -- 20 " -- >150 0 0 -- 21 " -- <212 0 0 -- 22 " <54 150 2,900 386 -- 23 " <54 212 1,600 213 -- 24 " 0 172 4,500 599 -- 25 " 0 >172 0 0 -- 26 N 2 0 Ambient 0 0 -- 27 N 2 0 Ambient 0 0 -- 28 N 2 0 Ambient 0 0 -- 29 Recirc. Coolant Containment Pressure 212 -- -- 350,000 30 " 7 212 2,900 386 -- 31 " 7 212 1,600 213 -- 32 " 1.5 212 4,400 586 -- 33 " 1.5 212 2,800 373 --
- Location numbers 100 on the process flow diagram re used for RHR loop operation.
- The process conditions listed describe the hot leg recirculation for subsystems A & B. Subsystem C continues to operate in the cold leg recirculation mode.
- 1. At reference conditions 212F and zero psig.