Term
Recirc
Describe recirculation flow. |
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Definition
-57.6 Mlbm/hr.
-42% driving.
-58% driven. |
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Term
Recirc
Describe the recirculation loops. |
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Definition
-2 loops.
-1 external pump.
-5 risers.
-10 jet pumps (2 per riser). |
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Term
Recirc
Describe the recirc pump MGs and power supplies. |
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Definition
-Buss 11 - 11 recirc pump.
-Buss 12 - 12 recirc pump.
-Mechanical stop at 20%. |
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Term
Recirc
Describe the recirc pump limits. |
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Definition
-Pump speed limited to 30% speed until:
-Discharge valve full open.
-FW flow > or equal to 20% (15 sec time delay). |
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Term
Recirc
Describe the function of the restriction bushing. |
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Definition
| Limits shaft leakage to 70gpm even if both seals fail. |
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Term
Recirc
Describe the motor alarms setpoints. |
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Definition
-Drive motor: 230F.
-Pump motor: 293F. |
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Term
Recirc
Describe the seal flow and leak rate. |
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Definition
-Lower seal gets 3gpm from CRD.
-Upper seal controls leakage to 3/4 gpm. |
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Term
Recirc
Describe the MG set cooling mechanism. |
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Definition
| Cooled by AC lube oil which is cooled by service water. |
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Term
Recirc
Describe the pump cooling medium, rates, and alarms. |
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Definition
-RBCCW.
-Low cooling water 58gpm.
-High RBCCW temp 120F.
-High seal cavity temp 160F. |
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Term
Recirc
Describe the AC lube oil pumps rated flow and power supplies. |
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Definition
-MCC-132/122.
-614gpm at 75psig. |
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Term
Recirc
Describe the DC lube oil pump rated flow and power supply. |
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Definition
-Powered by D-313.
-10gpm at 25 psig. |
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Term
Recirc
Describe the lube oil standby features and setpoints. |
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Definition
-27psig: standby AC oil pump starts.
-27psig for 6 seconds: MG drive motor trip and scoop tube lock.
-20psig: DC oil pump stops, drive motor start permissive.
-14.3 psig: DC oil pump starts.
-10 psig: Low drive motor/generator bearing oil press alarm. |
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Term
Recirc
Describe the temp alarms associate with the MG sets. |
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Definition
-55F low oil temp.
-190F high oil temp.
-210F MG drive motor trip, scoop tube lock. |
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Term
Recirc
Describe the recirc system suction valve interlocks and power supplies. |
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Definition
-Must be open to start pump.
-If <90% will trip drive breaker.
-Powered by MCC-133B/143B. |
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Term
Recirc
Describe the recirc system discharge valves interlocks and power supplies. |
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Definition
-Must be closed to start pump.
-Must be >20-25% open w/in 66 seconds of pump start or drive motor breaker trip.
-Pump speed <30% if not full open.
-MCC-133B/143B. |
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Term
Recirc
Describe the recirc drive motor breaker trips. |
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Definition
-Set at -47".
-LPCI loop select logic.
-Hi-Hi lube oil tem 210F.
-Low lube oil pressure <27psig w/ 6 second time delay.
-Suction valve <90%.
-Discharge valve <20-25% at 66secs.
-2R-to-1R auto transfer.
-Recirc MG gen lockout.
-Drive motor bus U/V.
-Local switch to TRIP.
-Control to STOP. |
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Term
Recirc
Describe the MG set field breaker trips. |
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Definition
-Recirc MG gen lockout.
-Generator loss of field.
-Low-low Rx water level -47" for 7.3secs.
-High Rx press 1135psig.
-Manual ATWS. |
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Term
Recirc
Describe what will give a recirc runback. |
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Definition
-Steam flow > 55.4%and both pumps running and feed or condensate pumps trip runback to 50% reset at 50.7% steam flow.
-Manual pull to runback to 50%.
-FW flow <20% for 15 sec to 30%.
-Disch not full open to 30%. |
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Term
Recirc
Describe the pump seal flow. |
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Definition
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Term
Recirc
Describe the recirc system design basis. |
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Definition
-Maintain system pressure boundary and flowpath for LPCI.
-Drive flow for circulation of Rx water.
-Vary the recirc flow.
-Flowpath for RHR shutdown cooling. |
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Term
Recirc
Describe the jet pump height and reason. |
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Definition
| 2/3 core height keeps fuel covered during LOCA. |
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Term
Recirc
Describe recirc flow (driving/driven). |
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Definition
-42% driving (pumps).
-58% driven (jet pumps). |
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Term
Recirc
Describe recirc pump hi vibration setpoint. |
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Definition
| 3 mils after 5 sec time delay. |
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Term
Recirc
Describe the low recirc cooling water flow setpoint. |
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Definition
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Term
Recirc
Describe the floating throttle function. |
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Definition
| Minimizes spray onto motor if seal failure occurs. |
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