diff --git a/site_ansto/instrument/config/source/reactor_status.sct b/site_ansto/instrument/config/source/reactor_status.sct
index b4ece185..0e3a2aa1 100644
--- a/site_ansto/instrument/config/source/reactor_status.sct
+++ b/site_ansto/instrument/config/source/reactor_status.sct
@@ -23,7 +23,9 @@ driver reactor_status = {
     var cns_out = { type = float; priv = spy; mutable = true; property klass = source;}
     var tg123   = { type = float; priv = spy; mutable = true; property klass = source;}
     var cg123   = { type = float; priv = spy; mutable = true; property klass = source;}
-    var tg4     = { type = float; priv = spy; mutable = true; property klass = source;}
+    var tg4     = { type = text; priv = spy; mutable = true; property klass = source;}
+    var hb1     = { type = int; priv = spy; mutable = true; property klass = source;}
+    var hb2     = { type = int; priv = spy; mutable = true; property klass = source;}
   }
 
   code read_function rdValue = {
@@ -43,6 +45,8 @@ driver reactor_status = {
     @       "TG123" { hset ${tc_root}/tg123 $v }
     @       "CG123" { hset ${tc_root}/cg123 $v }
     @       "TG4" { hset ${tc_root}/tg4 $v }
+    @       "HB1" { hset ${tc_root}/hb1 $v }
+    @       "HB2" { hset ${tc_root}/hb2 $v }
     @     }
     @   }
     @ }
diff --git a/site_ansto/instrument/config/source/reactor_status_sct.tcl b/site_ansto/instrument/config/source/reactor_status_sct.tcl
index 815bdc0c..acd8cd9b 100644
--- a/site_ansto/instrument/config/source/reactor_status_sct.tcl
+++ b/site_ansto/instrument/config/source/reactor_status_sct.tcl
@@ -126,6 +126,8 @@ proc ::scobj::reactor_status::rdAll {tc_root} {
        "TG123" { hset ${tc_root}/tg123 $v }
        "CG123" { hset ${tc_root}/cg123 $v }
        "TG4" { hset ${tc_root}/tg4 $v }
+       "HB1" { hset ${tc_root}/hb1 $v }
+       "HB2" { hset ${tc_root}/hb2 $v }
      }
    }
  }
@@ -254,6 +256,28 @@ proc ::scobj::reactor_status::mkDriver { sct_controller name device_class simula
     hsetprop ${scobj_hpath}/cns_out type "part"
     hsetprop ${scobj_hpath}/cns_out nxalias "${name}_cns_out"
 
+    hfactory ${scobj_hpath}/hb1 plain spy int
+    hsetprop ${scobj_hpath}/hb1 control true
+    hsetprop ${scobj_hpath}/hb1 data true
+    hsetprop ${scobj_hpath}/hb1 mutable true
+    hsetprop ${scobj_hpath}/hb1 nxsave true
+    hsetprop ${scobj_hpath}/hb1 oldval 0
+    hsetprop ${scobj_hpath}/hb1 klass "source"
+    hsetprop ${scobj_hpath}/hb1 sdsinfo "::nexus::scobj::sdsinfo"
+    hsetprop ${scobj_hpath}/hb1 type "part"
+    hsetprop ${scobj_hpath}/hb1 nxalias "${name}_hb1"
+
+    hfactory ${scobj_hpath}/hb2 plain spy int
+    hsetprop ${scobj_hpath}/hb2 control true
+    hsetprop ${scobj_hpath}/hb2 data true
+    hsetprop ${scobj_hpath}/hb2 mutable true
+    hsetprop ${scobj_hpath}/hb2 nxsave true
+    hsetprop ${scobj_hpath}/hb2 oldval 0
+    hsetprop ${scobj_hpath}/hb2 klass "source"
+    hsetprop ${scobj_hpath}/hb2 sdsinfo "::nexus::scobj::sdsinfo"
+    hsetprop ${scobj_hpath}/hb2 type "part"
+    hsetprop ${scobj_hpath}/hb2 nxalias "${name}_hb2"
+
     hfactory ${scobj_hpath}/power plain spy float
     hsetprop ${scobj_hpath}/power control true
     hsetprop ${scobj_hpath}/power data true
@@ -296,12 +320,12 @@ proc ::scobj::reactor_status::mkDriver { sct_controller name device_class simula
     hsetprop ${scobj_hpath}/tg123 type "part"
     hsetprop ${scobj_hpath}/tg123 nxalias "${name}_tg123"
 
-    hfactory ${scobj_hpath}/tg4 plain spy float
+    hfactory ${scobj_hpath}/tg4 plain spy text
     hsetprop ${scobj_hpath}/tg4 control true
     hsetprop ${scobj_hpath}/tg4 data true
     hsetprop ${scobj_hpath}/tg4 mutable true
     hsetprop ${scobj_hpath}/tg4 nxsave true
-    hsetprop ${scobj_hpath}/tg4 oldval 0.0
+    hsetprop ${scobj_hpath}/tg4 oldval UNKNOWN
     hsetprop ${scobj_hpath}/tg4 klass "source"
     hsetprop ${scobj_hpath}/tg4 sdsinfo "::nexus::scobj::sdsinfo"
     hsetprop ${scobj_hpath}/tg4 type "part"