9.0 Electrical Systems · switchyard via NATs (no fast transfer necessary) 6 • 4 trains • Each...
Transcript of 9.0 Electrical Systems · switchyard via NATs (no fast transfer necessary) 6 • 4 trains • Each...
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9.0 Electrical Systems
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Objectives1. State the purposes of the following:
a. Emergency Power Supply System (EPSS)b. Normal Power Supply System System (NPSS)c. Class 1E Uninterruptible Power Supply System (EUPS)d 12 Hour Uninterruptible Power Supply System (12UPS)
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d. 12-Hour Uninterruptible Power Supply System (12UPS)e. Non-Class 1E Uninterruptible Power Supply System
(NUPS)f. Station blackout diesel generators (SBODGs)
2. Describe the major differences between the electrical system design of the US-EPR and those of currently operating PWRs.
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EPSS• 6.9-kV buses always supplied from
switchyard via EATs (no fast transfer necessary)
• 4 divisions• Each EAT feeds 2 divisions• Each EAT is alternate to the other
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Each EAT is alternate to the other• Alternate feed capability between divs. 1 &
2, 3 & 4• Each division has standby EDG• 2 diesels per EPGB• Each division can be supplied by an
SBODG via manual lineup
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Emergency Power (EPSS)
4Figure 9-1 (Sheet 1)
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• EAT• Standby EDGs• Connections to
SBODG
Figure 9-1 (Sht 1),Divisions 1 & 2
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• Alternate feed (example)
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NPSS• Main generator supplies switchyard, but
not onsite distribution• 13.8-kV buses always supplied from
switchyard via NATs (no fast transfer necessary)
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• 4 trains• Each NAT feeds 2 trains• Each NAT is also an alternate supply• 2 trains have SBODGs• Each SBODG-backed bus can supply either
of 2 EPSS divisions via manual lineup
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Normal Power (NPSS)
7Figure 9-3 (Sheet 1)
• Main Generator
• NATs• SBODGs• Connections
to EPSS
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EUPS
• Supplies safety-related loads
• 4 divisions supplied from EPSS
• Each division:– 2 100%-capacity 480-Vac/250-Vdc battery
h
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chargers
– 250-Vdc 2-hr battery
– 250-Vdc/480-Vac inverter
– Several ac/dc & dc/dc converters
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Class 1E Uninterruptible Power Supply (EUPS)
9Fig. 9-2 (typical of all divisions)
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12UPS
• Supplies nonsafety-related loads– SBODG auxiliary loads & control power for
aligning SBODGs to NPSS & EPSS
– I&C support of severe accident mitigation
• 2 trains supplied from NPSS
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• 2 trains supplied from NPSS
• Each train:– 480-Vac/250-Vdc battery charger (1 spare)
– 250-Vdc 12-hr battery
– 250-Vdc/480-Vac inverter
– Several ac/dc & dc/dc converters
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12-Hr Uninterruptible Power Supply (12UPS)
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Fig. 9-4
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NUPS• Supplies nonsafety-related loads needed to
remain operational for investment protection
• 2 trains supplied from NPSS
• Each train:
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Each train:– 480-Vac/250-Vdc battery charger (1 spare)
– 250-Vdc battery
– 250-Vdc/480-Vac inverter
– Several ac/dc & dc/dc converters
– Supplies CRDMs via 2 sets of in-series reactor trip breakers
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Non-Class 1E Uninterruptible Power Supply (NUPS)
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Figure 9-5
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SBO Considerations
• Worst-case coping duration per RG 1.155: 8 hrs
• No coping analysis necessary; SBODGs meet 10CFR50.63 & RG 1.155 req’ts for lt t AC
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alternate AC sources:
– Not normally connected
– Low potential for CCF with EDGs
– Can be connected to EPSS buses w/in 10 min
– Sufficient capacity for SBO coping
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SBODGs• Located in separate areas of the switchgear
building
• Separate support subsystems
• Start on undervoltage on associated NPSS buses
Manually loaded
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• Manually loaded
• Major SBO loads:– Division 1 & 4 EFW pumps
– HVAC for MCR, SBO equipment
– Selected I&C
– MCR lighting
– MSRTs