diff --git a/coordinator/iocontrol.lua b/coordinator/iocontrol.lua
index d2ee8ef..9345075 100644
--- a/coordinator/iocontrol.lua
+++ b/coordinator/iocontrol.lua
@@ -52,7 +52,7 @@ function iocontrol.init(conf, comms)
     io.facility = {
         num_units = conf.num_units,
         tank_mode = conf.cooling.fac_tank_mode,
-        tank_defs = conf.cooling.fac_tank_list,
+        tank_defs = conf.cooling.fac_tank_defs,
         all_sys_ok = false,
         rtu_count = 0,
 
@@ -219,7 +219,7 @@ function iocontrol.init(conf, comms)
     -- on other facility modes, overwrite unit TANK option with facility tank list
     else
         for i = 1, #io.units do
-            io.units[i].has_tank = conf.cooling.fac_tank_list[i] > 0
+            io.units[i].has_tank = conf.cooling.fac_tank_defs[i] > 0
         end
     end
 
diff --git a/supervisor/config.lua b/supervisor/config.lua
index 3ea0da8..5ea565b 100644
--- a/supervisor/config.lua
+++ b/supervisor/config.lua
@@ -42,7 +42,7 @@ config.REACTOR_COOLING = {
 -- (see wiki for details)
 -- by default, dynamic tanks are for each unit
 config.FAC_TANK_MODE = 0
-config.FAC_TANK_LIST = { 0, 0, 0, 0 }
+config.FAC_TANK_DEFS = { 0, 0, 0, 0 }
 
 -- log path
 config.LOG_PATH = "/log.txt"
diff --git a/supervisor/startup.lua b/supervisor/startup.lua
index 4da9937..c1a7036 100644
--- a/supervisor/startup.lua
+++ b/supervisor/startup.lua
@@ -49,14 +49,14 @@ cfv.assert_min(config.PKT_TIMEOUT, 2)
 cfv.assert_type_int(config.NUM_REACTORS)
 cfv.assert_type_table(config.REACTOR_COOLING)
 cfv.assert_type_int(config.FAC_TANK_MODE)
-cfv.assert_type_table(config.FAC_TANK_LIST)
+cfv.assert_type_table(config.FAC_TANK_DEFS)
 cfv.assert_type_str(config.LOG_PATH)
 cfv.assert_type_int(config.LOG_MODE)
 
 assert(cfv.valid(), "bad config file: missing/invalid fields")
 
-assert((config.FAC_TANK_MODE ~= 0) and (config.NUM_REACTORS == #config.FAC_TANK_LIST),
-    "bad config file: FAC_TANK_LIST length not equal to NUM_REACTORS")
+assert((config.FAC_TANK_MODE == 0) or (config.NUM_REACTORS == #config.FAC_TANK_DEFS),
+    "bad config file: FAC_TANK_DEFS length not equal to NUM_REACTORS")
 
 cfv.assert_eq(#config.REACTOR_COOLING, config.NUM_REACTORS)
 assert(cfv.valid(), "config: number of cooling configs different than number of units")
diff --git a/supervisor/supervisor.lua b/supervisor/supervisor.lua
index e0e87e8..37707a3 100644
--- a/supervisor/supervisor.lua
+++ b/supervisor/supervisor.lua
@@ -33,7 +33,7 @@ function supervisor.comms(_version, nic, fp_ok)
     -- configuration data
     local num_reactors = config.NUM_REACTORS
     ---@class sv_cooling_conf
-    local cooling_conf = { r_cool = config.REACTOR_COOLING, fac_tank_mode = config.FAC_TANK_MODE, fac_tank_list = config.FAC_TANK_LIST }
+    local cooling_conf = { r_cool = config.REACTOR_COOLING, fac_tank_mode = config.FAC_TANK_MODE, fac_tank_defs = config.FAC_TANK_DEFS }
 
     local self = {
         last_est_acks = {}