diff --git a/include/openmc/bank.h b/include/openmc/bank.h
index b62982809..c3a49dbad 100644
--- a/include/openmc/bank.h
+++ b/include/openmc/bank.h
@@ -22,13 +22,6 @@ namespace simulation {
 
 extern std::vector<Particle::Bank> source_bank;
 extern std::vector<Particle::Bank> fission_bank;
-//extern std::vector<Particle::Bank> secondary_bank;
-#ifdef _OPENMP
-extern std::vector<Particle::Bank> master_fission_bank;
-#endif
-
-//#pragma omp threadprivate(fission_bank, secondary_bank)
-#pragma omp threadprivate(fission_bank)
 
 } // namespace simulation
 
diff --git a/include/openmc/particle.h b/include/openmc/particle.h
index 3c6b8413d..f818299cd 100644
--- a/include/openmc/particle.h
+++ b/include/openmc/particle.h
@@ -311,6 +311,8 @@ public:
   
   // Secondary bank
   std::vector<Particle::Bank> secondary_bank_;
+
+  int64_t current_work_; // current work index
 };
 
 } // namespace openmc
diff --git a/include/openmc/simulation.h b/include/openmc/simulation.h
index 4ee02a0f0..c06e854dc 100644
--- a/include/openmc/simulation.h
+++ b/include/openmc/simulation.h
@@ -28,7 +28,6 @@ namespace simulation {
 
 extern "C" int current_batch;    //!< current batch
 extern "C" int current_gen;      //!< current fission generation
-extern "C" int64_t current_work; //!< index in source back of current particle
 extern "C" bool initialized;     //!< has simulation been initialized?
 extern "C" double keff;          //!< average k over batches
 extern "C" double keff_std;      //!< standard deviation of average k
@@ -53,7 +52,7 @@ extern std::vector<int64_t> work_index;
 // Threadprivate variables
 extern "C" bool trace;     //!< flag to show debug information
 
-#pragma omp threadprivate(current_work, trace)
+#pragma omp threadprivate(trace)
 
 } // namespace simulation
 
diff --git a/include/openmc/tallies/derivative.h b/include/openmc/tallies/derivative.h
index 673afb0c9..d937116b1 100644
--- a/include/openmc/tallies/derivative.h
+++ b/include/openmc/tallies/derivative.h
@@ -65,13 +65,13 @@ void zero_flux_derivs();
 
 // Explicit vector template specialization declaration of threadprivate variable
 // outside of the openmc namespace for the picky Intel compiler.
-extern template class std::vector<openmc::TallyDerivative>;
+//extern template class std::vector<openmc::TallyDerivative>;
 
 namespace openmc {
 
 namespace model {
 extern std::vector<TallyDerivative> tally_derivs;
-#pragma omp threadprivate(tally_derivs)
+//#pragma omp threadprivate(tally_derivs)
 extern std::unordered_map<int, int> tally_deriv_map;
 } // namespace model
 
diff --git a/src/eigenvalue.cpp b/src/eigenvalue.cpp
index 110f0100e..32fd56fff 100644
--- a/src/eigenvalue.cpp
+++ b/src/eigenvalue.cpp
@@ -351,6 +351,7 @@ void calculate_average_keff()
   }
 }
 
+/*
 #ifdef _OPENMP
 void join_bank_from_threads()
 {
@@ -384,6 +385,7 @@ void join_bank_from_threads()
   }
 }
 #endif
+*/
 
 int openmc_get_keff(double* k_combined)
 {
diff --git a/src/particle.cpp b/src/particle.cpp
index e7079aba8..d6867da5c 100644
--- a/src/particle.cpp
+++ b/src/particle.cpp
@@ -672,7 +672,7 @@ Particle::write_restart() const
     write_dataset(file_id, "id", id_);
     write_dataset(file_id, "type", static_cast<int>(type_));
 
-    int64_t i = simulation::current_work;
+    int64_t i = current_work_;
     write_dataset(file_id, "weight", simulation::source_bank[i-1].wgt);
     write_dataset(file_id, "energy", simulation::source_bank[i-1].E);
     write_dataset(file_id, "xyz", simulation::source_bank[i-1].r);
diff --git a/src/simulation.cpp b/src/simulation.cpp
index 1ba8844b8..dfb664ef9 100644
--- a/src/simulation.cpp
+++ b/src/simulation.cpp
@@ -950,8 +950,6 @@ int openmc_next_batch(int* status)
     // Start timer for transport
     simulation::time_transport.start();
 
-	  simulation::current_work = 1;
-
     transport();
 
     // Accumulate time for transport
@@ -1032,25 +1030,7 @@ void allocate_banks()
   simulation::source_bank.resize(simulation::work_per_rank);
 
   if (settings::run_mode == RUN_MODE_EIGENVALUE) {
-#ifdef _OPENMP
-    // If OpenMP is being used, each thread needs its own private fission
-    // bank. Since the private fission banks need to be combined at the end of
-    // a generation, there is also a 'master_fission_bank' that is used to
-    // collect the sites from each thread.
-
-    #pragma omp parallel
-    {
-      if (omp_get_thread_num() == 0) {
-        simulation::fission_bank.reserve(3*simulation::work_per_rank);
-      } else {
-        int n_threads = omp_get_num_threads();
-        simulation::fission_bank.reserve(3*simulation::work_per_rank / n_threads);
-      }
-    }
-    simulation::master_fission_bank.reserve(3*simulation::work_per_rank);
-#else
     simulation::fission_bank.reserve(3*simulation::work_per_rank);
-#endif
   }
 }
 
@@ -1269,6 +1249,7 @@ void initialize_history(Particle* p, int64_t index_source)
 {
   // set defaults
   p->from_source(&simulation::source_bank[index_source - 1]);
+  p->current_work_ = index_source;
 
   // set identifier for particle
   p->id_ = simulation::work_index[mpi::rank] + index_source;
diff --git a/src/tallies/derivative.cpp b/src/tallies/derivative.cpp
index f6f10cf7a..c2e70ab0d 100644
--- a/src/tallies/derivative.cpp
+++ b/src/tallies/derivative.cpp
@@ -83,7 +83,7 @@ read_tally_derivatives(pugi::xml_node node)
 {
   // Populate the derivatives array.  This must be done in parallel because
   // the derivatives are threadprivate.
-  #pragma omp parallel
+  //#pragma omp parallel
   {
     for (auto deriv_node : node.children("derivative"))
       model::tally_derivs.emplace_back(deriv_node);
diff --git a/src/tallies/tally.cpp b/src/tallies/tally.cpp
index 059803e76..9b438ab34 100644
--- a/src/tallies/tally.cpp
+++ b/src/tallies/tally.cpp
@@ -1042,7 +1042,7 @@ setup_active_tallies()
 void
 free_memory_tally()
 {
-  #pragma omp parallel
+  //#pragma omp parallel
   {
     model::tally_derivs.clear();
   }