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12 Cards in this Set
- Front
- Back
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Standby NESW pump auto starts
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low pump discharge pressure(looks at unit), blackout sequence (train specific), safety injection actuation (train specific)
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NESW pump trips.
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manual, overload/overcurrent, load shed. (on load shed it starts after diesels power up unless phase B)
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Explain how NESW system performs containment temperature control.
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cas panel for the regulating valve is adjusted to maintain flow.
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Describe how the duplex strainer operates to protect the NESW system function of heat removal .
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Removes debris from the NESW to prevent fouling of systems. (gate slides back and forth, NESW only has discharge valve.
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list the normal power supply to the NESW pumps.
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11b,11c,21b,21c (600 v)
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list the normal power supply to the NESW system motor op valves
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250vdc
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list the normal power supply to the Nesw system air operated valves
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250vdc
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explain the effect of the interlocks on control air compressor with low NESW supply pressure.
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cac is interlocked to prevent start of Nesw pressure @ the vac is insufficient. (15psig) if this happens you may have to blow down the strainer.
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state the normal parameters for the Nesw pump discharge pressure.
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80-90 Psig (usually closer to 80)
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state the normal range of the Nesw strainer differential pressure.
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D/P high alarm: u1 95" h2o( backwashes @ 76") u2 97" h2o( backwashes @ 86")
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Describe the Nesw system response during loss of off-site power.
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Nesw pumps are loaded when their respective diesel generators come up to speed
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Describe the Nesw system response during rough lake conditions.
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can plug up Nesw strainers. frequent backwashing may occur. (high d/p levels) strainers @ individual loss may plug up and need to be blown down.
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