diff --git a/src/integrationtest/integrationtest_drunc.py b/src/integrationtest/integrationtest_drunc.py
index ec7a09a..233d0b6 100755
--- a/src/integrationtest/integrationtest_drunc.py
+++ b/src/integrationtest/integrationtest_drunc.py
@@ -115,22 +115,9 @@ def pytest_generate_tests(metafunc):
         # create an entry for the default choice of ssh-standalone
         metafunc.module.process_manager_choices = { "StandAloneSSH_PM" : "ssh-standalone" }
 
-    # 27-Feb-2026, KAB: support for the nanorc --> dunerc transition
-    # We will be able to remove the following two lines once all integtests
-    # have been converted to use dunerc instead of nanorc.
-    if not hasattr(metafunc.module, "dunerc_command_list") and hasattr(metafunc.module, "nanorc_command_list"):
-        metafunc.module.dunerc_command_list = metafunc.module.nanorc_command_list
-
     parametrize_fixture_with_items(metafunc, "create_config_files", "confgen_arguments")
     parametrize_fixture_with_items(metafunc, "process_manager_type", "process_manager_choices")
-
-    # 27-Feb-2026, KAB: support for the nanorc --> dunerc transition
-    # We will be able to just use "run_dunerc" once all integtests
-    # have been converted to use dunerc instead of nanorc.
-    if "run_nanorc" in metafunc.fixturenames:
-        parametrize_fixture_with_items(metafunc, "run_nanorc", "dunerc_command_list")
-    if "run_dunerc" in metafunc.fixturenames:
-        parametrize_fixture_with_items(metafunc, "run_dunerc", "dunerc_command_list")
+    parametrize_fixture_with_items(metafunc, "run_dunerc", "dunerc_command_list")
 
     # determine the number of different parametrizations
     # (recall that this fixture is called once per pytest function in each integtest)
@@ -440,12 +427,6 @@ def apply_update(obj, substitution):
     yield result
 
 
-# 27-Feb-2026, KAB: support for the nanorc --> dunerc transition
-# Temporary fixture until all integtests have been changed to use "dunerc".
-@pytest.fixture(scope="module")
-def run_nanorc(run_dunerc):
-    yield run_dunerc
-
 @pytest.fixture(scope="module")
 def run_dunerc(request, create_config_files, process_manager_type, tmp_path_factory):
     """Run drunc with the OKS DB files created by `create_config_files`. The
@@ -749,9 +730,6 @@ class RunResult:
     result.confgen_config = create_config_files.config
     result.config_session_name = create_config_files.config.config_session_name
     result.daq_session_name = create_config_files.config.daq_session_name
-    # 27-Feb-2026, KAB: the nanorc_commands return value can be removed once
-    # all integtests have been changed to use "dunerc".
-    result.nanorc_commands = run_control_commands
     result.dunerc_commands = run_control_commands
     result.run_dir = run_dir
     result.config_dir = create_config_files.config_dir