Added snapshot_inv() and init_inv() to DepleteReactor.py

CHANGELOG.rst

@@ -14,6 +14,7 @@ Since last release:
   power (instead of just using `power_cap`) and flux 
   (required input for running OpenMC with new version) (#18)
 * Add CI test to check if CHANGELOG has been updated (#21)
+* Added snapshot_inv() and init_inv() to DepleteReactor.py (#23)
 
 **Changed:**
 
@@ -33,7 +34,8 @@ Since last release:
 
 **Fixed:**
 
+* Fixed the sudden loss of core count in the Tick step when the <explicit_inventroy> flag is on.
 
 v 0.1.0
 =========
-Initial release 
+Initial release 

openmcyclus/DepleteReactor.py

@@ -343,7 +343,7 @@ def get_material_requests(self):  # phase 1
         ports: list of dictionaries
             Format: [{"commodities":
                       [{commod_name(str):Material object,
-                        "preference":int/float,
+                        "preference":int/float, 
                         "exclusive":Bool}, ...],
                       "constraints:int/float}, ...]
             Defines the request portfolio for the facility.
@@ -589,7 +589,6 @@ def discharge(self):
                 tot_spent += mats.quantity
                 lib.record_time_series(
                     "supply" + self.fuel_outcommods[ii], self, tot_spent)
-
         return True
 
     def load(self):
@@ -843,3 +842,22 @@ def record_position(self):
         position_table.add_val("AgentId", self.id, None, "int")
         position_table.add_val("Latitude", self.latitude, None, "double")
         position_table.add_val("Longitude", self.longitude, None, "double")
+
+
+    def snapshot_inv(self):
+        """returns a dictionary of current inventories"""
+        invs = {
+                "fresh_fuel": list(self.fresh_fuel),
+                "core": list(self.core),
+                "spent_fuel": list(self.spent_fuel)
+                }
+        return invs
+
+    def init_inv(self,invs):
+        """intialized facility inventories"""
+        if "fresh_fuel" in invs:
+            self.fresh_fuel.push_many(invs["fresh_fuel"])
+        if "core" in invs:
+            self.core.push_many(invs["core"])
+        if "spent_fuel" in invs:
+            self.spent_fuel.push_many(invs["spent_fuel"])