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Electrode Boiler
9.2-Daily maintenance
1.Clean the strainers in the water supply, cooling, feedwater pump, and blowdown cooling lines.
2.Check each open valve for freedom of operation.
3.Blow down the water column by opening the drain on the bottom. Allow two to ten seconds for blow-
down, then close the valve fully.
4.Blow down the boiler to clear out any sludge accumulation in the pressure vessel. Generally, five to
ten seconds will be sufficient. Experience and observation will indicate the proper duration of blow-
down. The color of the water is a good indicator of the amount of accumulated sludge. The murkier
the water is, the longer blowdown should continue or the more often the boiler should be blown down.
Boiler blowdown
A.Open the blowdown valve nearest the boiler, fully.
B.Open the second valve as quickly as possible to minimize valve seat erosion.
C.The boiler will be blowing down at this point. When blowdown has continued long enough, fully
close the valve furthest from the boiler.
D.When the flow stops, close the nearest valve to ensure a tight shutoff.
5.Check the levels in the chemical feed and hydraulic fluid reservoirs and top off as needed. If the
hydraulic fluid level is abnormally low, check the hydraulic system for leaks.
6.Check for steam leaks at the electrode insulators and the control rod packing. If necessary, replace
gaskets and/or packing. Refer to Section 9.6 for more information on the packing of the gland housing
for the control rod. Control rod packing should be checked for leaks within 2-4 weeks of initial
operation after the gland is packed.
7.Check mechanical seal on circulating pump for significant leakage.
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