Evaporator safety valve setting

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There is a heat exchanger in use: saturated water at 16 MPa flows on the shell side and is vaporized by a heater, while a high-temperature fluid at 2 MPa flows on the tube side. How should the discharge capacity of the safety valve on the tube side be calculated? After the heat exchange tube ruptures, saturated water enters the tube bank; part of it is vaporized by the flash steam, while the rest turns into low-pressure saturated water. Should this water be taken into account when calculating the flow rate, considering that it may be vaporized due to the high-temperature medium present in the tube bank? If we consider how to approach this, and how to take into account the amount of high-temperature medium, whether it’s the inventory on the pipe side or the normal flow rate – if it’s the normal flow rate, then the water that comes in gets completely vaporized. If it is existing stock, then is it related to time?