LOSS OF POWER TEST

UNDERSTANDING THE LOSS OF POWER TEST

One of the last tests to perform prior to melter heatup is the loss of power test. This test is performed to ensure the workforce – all four shifts and all personnel – perform as expected if the Plant experiences a loss of power during operations.

Preserving Melter Lifespan

Once a melter is heated up, it must stay at temperature to prevent the melted glass and components from becoming solid. It cannot be reheated once in a solid state.

Preserving Melter Lifespan

Once a melter is heated up, it must stay at temperature to prevent the melted glass and components from becoming solid. It cannot be reheated once in a solid state.

Designed to Prevent Cooling

Prior to heating the first melter, power is cut to the facility and workers must prove they are capable and proficient in restarting required systems.

Designed to Prevent Cooling

Prior to heating the first melter, power is cut to the facility and workers must prove they are capable and proficient in restarting required systems.

Each Shift Conducts Drills

In the weeks leading up to the test, Operations will run drills on all four rotating shifts to demonstrate proficiency and ensure that operators are ready for the test.

  Each Shift Conducts Drills

In the weeks leading up to the test, Operations will run drills on all four rotating shifts to demonstrate proficiency and ensure that operators are ready for the test.

Cutting Power to the Melter

The actual Loss of Power test will be conducted one time; offsite electrical power to the DFLAW facilities will be removed.

Cutting Power to the Melter

The actual Loss of Power test will be conducted one time; offsite electrical power to the DFLAW facilities will be removed.

Restoring Power to the Melter

Operators will restore power to systems according to procedure.

Restoring Power to the Melter

Operators will restore power to systems according to procedure.

The Loss of Power test is the “final exam” that demonstrates systems are ready to respond to a loss of power before heating the first melter. Up until this time, systems are tested individually. The Loss of Power test signifies the switch from individual startup testing to fully integrated commissioning testing over several months time.

LOSS OF POWER TEST FAQs

Will the loss of power test affect fire water capabilities?

No, fire water is provided with a diesel engine pump backup.

What will happen if the test fails?

If operators are unable to bring systems back online, design changes or other corrective actions will take place and then the test will be repeated.

How do you ensure safety during a major test like this?

All work control documents go through a rigorous hazard analysis process including walkdowns/walkthroughs with actual workers who will be performing the work to ensure that safety is maintained. This is all done well before the test takes place.

How long do you estimate the power will be down during the test?

It is estimated to take up to an hour to complete immediate actions to restore power and set the stage for starting re-energization. Full restoration of power to all users may take several hours.

Are you running any drills leading up to the loss of power test?

In the weeks leading up to the test, Operations will run drills on all four rotating shifts to demonstrate proficiency and ensure that operators are ready for the test.

Will all shifts practice restarting systems after a power loss or is this a one-time test?

Operators on all shifts will practice and run loss of power drills as many times as necessary to meet proficiency targets, although actually turning off the power is not required for this kind of practice. The actual Loss of Power test that will cut power to the LAW facility will be conducted one time.

Is there anything in the melters during the test?

No, the melters are ‘cold’ for the Loss of Power test and will remain empty.

What backup systems do you have in place if you lose power for a long period of time? (for test and operations)

If site power is lost during the commissioning phase, WTCC has coordinated required actions with the Hanford Site infrastructure contractor to restore power without any unnecessary delays.

Why is the Loss of Power test important?

The Loss of Power test is the “final exam” that demonstrates all systems are ready to support Melter 1 Heatup.

Which systems does this test include?

The Loss of Power test will remove offsite electrical power to the DFLAW facilities. Construction power will not be affected. It tests the medium and low voltage distribution systems (MVE & LVE), uninterruptible power (UPE) for non-safety functions, integrated control network, restoration of plant cooling to select melter systems (PCW), selected restoration of C5 confinement ventilation (C5V), and ability to restore operation of select system supporting recovery such as melter feed system agitators (LFP).

How have personnel trained and prepared to perform this test and to do it safely and to meet quality standards?

Training for operators includes classroom training, on the job training, simulator training, qualifications, drills, and proficiency demonstrations.