· It may please be noted that the p

· It may please be noted that the power supply to Local Diverter Damper panel is non-UPS as per the wiring diagram. Power supply to Emergency Circuit is UPS. Back up time for the UPS to be checked by NEPC for sufficiency to accommodate any effect from this type of event.
· Hydraulic oil circuit design is “ De-Energized of Electric Valve to close Diverter Damper”. However If Hydraulic oil pumps indicated in the wiring diagram do not run due to non-availability of Power Supply(L1,L2,L3) during black out condition, diverter damper will fail to close. Hence Emergency power feeder is required to local panel of diverter damper for closing action of diverter damper during total power failure. Available spare Emergency feeder may be provided from spare(refer attachment).
· As per the DCS trend under the power failure condition, Main stream stop valve has closed causing rising drum pressure and subsequently opening the start up vent valve. Due to open condition of startup vent for substantial period resulted in decrease in drum pressure. This condition in effect has led to faster evaporation and drying of Boiler drum. NEPC should revisit if it is truly required to OPEN startup vent under this black out condition. Because the heat input to HRSG will continue to reduce from the point of tripping, although drum pressure may rise temporarily due to closure of Main Steam Stop valve, Drum pressure could have started lowering on it’s own. Moreover there are Drum Safety valves to give protection to Drum under over pressure condition.
· Requirement of Startup vent valve Opening and duration of opening to be checked.

5. One contact input to be generated for Grid Failure and the same contact to be used for Emergency closing of Diverter Damper

結果 (中文) 1:

·请可能注意到的被到当地分流阻尼器面板电源是非 UPS 按照接线图。对紧急情况下电路的电源是 UPS。备份时间为 UPS，以供核查的去甲肾上腺素预处理的充分性以容纳任何从这种类型的事件的影响。·液压油电路设计是"断电的电动阀门关闭分流阻尼器"。但是如果液压油泵接线原理图所示，并不会由于非可用性电源 Supply(L1,L2,L3) 期间黑出条件进行研究的分流阻尼器将无法关闭。因此，应急电源馈线则需要转向器减振器关闭分流阻尼器总停电时行动的当地小组。可从 spare(refer attachment) 提供可用备用紧急送纸器。·根据电源故障条件下的 DCS 趋势，主要流截止阀已关闭导致上升的汽包压力和随后打开放空阀的启动。由于开放条件下的启动相当长一段排气造成汽包压力下降。这种情况下实际上已带领到更快的蒸发和烘干锅炉汽包。如果它是真正需要打开启动发泄在这黑出条件下，应重新审视去甲肾上腺素预处理。因为余热锅炉的热输入将继续减少从跳闸，点虽然汽包压力可能暂时上升，因主汽阀关闭，汽包压力可能已经开始降低它自己。此外还有鼓安全阀是压力条件下的鼓下优先保护。·要求启动排气口阀开幕和持续时间的开放，要检查。 5.一种接触投入，为电网故障和同一联系人以便用于生成分流阻尼器紧急关闭

結果 (中文) 3:

·可能请注意，供应当地分流阻尼板的电源是非UPS按接线图。应急电路供电电源。备份时间被充分容纳这类事件的任何影响公司检查UPS。·液压油路的设计是“断电电动阀关闭转向阻尼器”。但是如果在接线图表明液压油泵不运行由于电源不可用（L1，L2，L3）黑色状态时，转向器将无法关闭。因此，急救电源需要转向阻尼器局部面板的转向阻尼器总断电期间关闭动作。备用应急接驳器可提供备用（参见附件）。按DCS的趋势，在动力失效条件下，主流截止阀关闭了引起汽包压力升高，随后打开启动气孔的阀门。由于在鼓压力下，由于启动条件的启动，在很大一段时间内，导致减少。这种情况的影响，导致更快的蒸发和干燥的锅炉汽包。公司应该重新考虑是否真的需要打开启动排气在这黑色的条件。由于热输入对余热锅炉将继续减少从跳闸点，虽然汽包压力可能暂时升高由于主蒸汽截止阀关闭，汽包压力可能开始降低它自己。此外还有在超高压条件下对汽包进行保护的汽包安全阀。、启开阀开度和开度的要求。5。一个接触的输入是电网故障和用于转向阻尼器急救关闭相同的接触产生的