maintenance activity must be conducted in accordance with
FIST Volume 1-1,
Hazardous Energy Control Program (HECP) and
Reclamation Safety and Health
Standards. A job hazard analysis (JHA) must be conducted as well. Visitors,
contractors, and others working under clearances must be trained in HECP and must
follow all JHA and clearance procedures.
Annunciators provide essential plant condition status information to O&M personnel.
Two aspects must be considered: (1) correct operation of the annunciator itself and
(2) integrity of the alarm devices and interconnected wiring. Annunciator operation is
easily tested using the "Test" button provided on most annunciators and is considered
an "operations" activity.
Verifying integrity of the alarm devices and interconnecting wiring requires a
"functional test" of these circuits. Functional testing is accomplished by (1) resetting
the annunciator, (2) closing (or opening) contacts at the alarm device, and (3) verifying
that the correct annunciator window is activated. It is recommended that the alarm
device actually be triggered, where possible, for best assurance; however, it may be
necessary to simulate contact operation with a "jumper" (or lifted lead) when device
activation is not possible.
Caution: Operating the alarm device may trigger unwanted
control or protection actions as well as annunciation.
Know what "should happen" by consulting up-to-date drawings before triggering
Annual functional testing of annunciators is recommended for best assurance of
integrity. However, this may be considered too extensive for time and resource
limitations. In these cases, functional testing of those alarm points that indicate
impending shutdown or failure that could be mitigated by operator action is still
Functional testing of annunciators is also recommended after a major outage or after
modifications that affect wiring and cabling in the plant.