Equipment Failure Procedure
SP-28 Soluble Poison System 10/22/62
A. Failure Of Soluble Poison System During Daily check
NOTE: The conditions in the soluble poison system and operation of the associated equipment
are to be checked once a day.
- 1. If the water level is found to be below normal level return it to the proper level in the
sight glass with fill water from a demineralized feed.
- 2. IF the tank agitator is malfunctioning or inoperative,tag out the controls, and
repair the unit. If soluble poison is required in the reactor while the unit is inoperative
us a paddle to dissolve the boric acid crystals.
- 3. IF the operating immersion heater is inoperative, switch to the standby heater, tag
out the controls of the inoperable heater, and repair the unit. If soluble poison is
required in the reactor, while the inoperative heater is out of service, it will require a
longer time to dissolve the boric acid and prepare it for injection in the primary system.
- 4. If both immersion heaters are inoperative, tag out the controls, and repair the units.
IF soluble poison is required in the reactor while the inoperative heaters are out of service,
drain the water in the tank and fill with hot water from the deaerated feedwater tank. Dissolve
100 pounds of boric acid in the tank and start pumping the tank solution into the reactor.
IF the tank temperature drops to 150F, raise the temperature by adding hot water from the DFT.
Cautiously add more boric acid crystals. Be sure that all the crystals dissolve. Continue
this operation until the boric acid is in the reactor.
- 5. IF the tank is empty during the daily check or below 175F and if the cause cannot be
immediately corrected, shut the reactor down and repair the faulty unit.
B. Failure Of Soluble Poison System While Testing It With the Weekly Operational Check Of
The Emergency Cooling System
- The soluble poison system is operated in direct association with the emergency cooling
system and the operation of the emergency cooling system is checked on a weekly basis, in order
to insure that all equipment is ready to operate if needed. During this period a check is made
to determine that suction for the emergency makeup pump can be taken from the soluble poison
tank. If a failure occurs in either of these two systems, shutdown the reactor and correct
C. Filling And Draining The Soluble Poison Tank
- 1. The water in the soluble poison tank will tend to become stagnant and impure after a
period of time. Therefore, the water is to be changed on a monthly basis or more often as
determined by sample analysis.
- 2. Unlock and open drain valve SP-4V to drain the tank.
- 3. Unlock and slowly open valve SP-1V.
- 4. Allow filling water to flow through the drain line a few moments and close and lock
- 5. Continue to add fill water until the water level is at the normal water level in the tank
sight glass. Close and lock valve SP-1V.
My text copyright 2020 Tommy Johnson, all rights reserved. I believe the Savannah documentation is property of
MARAD or the US government.