Normal Control Area Heating and Ventilation Failure

DOE-HDBK-1099-96

APPENDIX B - EXAMPLE DRILL SCENARIOS

Title:

Drill Number: 010-02

Revision Number: 0

Initial Conditions: Control Area H&V on line at time of initiation.

Pre-drill Notifications: Mark appropriate space as notifications are made.

None.

Precautions and Limitations: None.

Operational limits:

None.

Technical Safety Requirements: Control Room Environment Inst. 17.3/4.3.4.5, 17.3.5.3

Drill Team Duties: The main concern of the Drill Coordinator should be that the response is

handled logically using procedures and drawings.

Evaluator: The drill evaluator in the control room evaluates control room procedure use,

controlled drawing use, and problem solving actions. Field drill evaluator

evaluates Shift Supervisor actions.

Safety Monitor:

Terminate if Control Room environment becomes uncomfortable, and

have ventilation restored.

Drill Initiation: B20 Breaker 29 (supply to B20A) or S42-B20A is opened, resulting in a C-418

alarm due to the loss of E521, E522, E519M1 & M2, R519 and R52l.

Expected Response/Evaluation Criteria:

The Control Room dispatches an operator to C-418 in response to the alarm. The SS

watch reports the loss of Control Area H&V and that fault alarms won't clear. The CRA

verifies C177B is not the cause.

System knowledge and P&ID's should lead to checking B20A. SS finds the breaker in a

tripped condition and attempts to reclose it with Control Room permission. The breaker

will not reclose and actions are initiated to get the RSS to fix it.

B 2-2