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What Nuclear Instruments are powered from 24VDC?
- D15:
- SRM 21, 22
- IRM 11, 12, 13, 14
- D25:
- SRM 23, 24
- IRM 15, 16, 17, 18
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What powers 24 VDC Battery Chargers?
- Div I = 120 VAC via MCC-143 (L-34)
- Div II = 120 VAC via MCC-133 (L-38)
[Note that Div I chargers powered from Div II MCC, and vice-versa]
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What is the 24 VDC Battery Operability temperature range?
60F to 90F
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Explain the design of the 24 VDC battery system...
- Two independent systems.
- Each system has two 24V batteries and two battery chargers.
Insulated from ground except at load end.
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What are the Low and High Voltage setpoints for 24 VDC?
High Volt Shutdown: 29.75 V
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What are the Tech Spec and/or TRM implications if one 24 VDC battery charger is out of service?
- TRM 3.8.2
- If one or two 24VDC battery subsystems are Inop, must IMMEDIATELY declare associated supported equipment INOP in Modes 1, 2, and 3.
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In the event of a SBO (Station Black Out), how long will the essential AND non-essential 250 VDC batteries provide adequate voltage?
Essential: 4 hours
Non-Essential: 90 minutes staged intervals
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125 VDC bus voltage HI/LOW setpoints?
HI: 140 to 141 V
LOW: 120 to 121 V
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Power supplies to 125 VDC battery chargers?
Div I: MCC-133A via Batt Chargers via D11
Div II: MCC-143A via Batt Chargers via D21
Swing: MCC-142A via Swing Charger
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Div I 125 VDC major loads?
- 4KV breaker control power
- Annunciator panels
- Emergency lighting
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