Production of Polysilicon using a Modified Siemens Process
Production of Polysilicon using a Modified Siemens Process
Production of Polysilicon using a Modified Siemens Process
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Scenario (3.1): Reactor Maintenance<br />
Description: Reactors will be inspected for performance<br />
Primary Object: Reactors<br />
Primary Actors: Maintenance Operator<br />
Pre-condition: <strong>Process</strong> is not running<br />
Flow <strong>of</strong> Events:<br />
1. Operator inspects the reactor for any signs <strong>of</strong> problems<br />
2. If there is a problem, the operator will take appropriate action, whether it is<br />
replacing or fixing the reactor/problem<br />
3. The operator documents the actions taken and the date the inspection took<br />
place<br />
Post-condition: Reactor is ready for optimal performance.<br />
Scenario (3.1.1): Weakened Structural Integrity<br />
<br />
Description: Structural weakening in reactors must be detected and replaced<br />
Primary Object: Reactor<br />
Primary Actors: Maintenance Operator<br />
Pre-condition: <strong>Process</strong> not running<br />
Flow <strong>of</strong> Events:<br />
1. Maintenance operator inspects reactor<br />
2. Operator discovers structural weakness, such as corrosion from HCl<br />
3. Reactor is removed and replaced with new reactor<br />
4. Maintenance is documented<br />
Post-condition: New reactor installed and process is able to continue without<br />
increased operation hazard levels<br />
Scenario (3.1.2): Leak in Reactor<br />
Description: Reactor develops a leak and must be patched up or replaced<br />
Primary Object: Reactor<br />
Primary Actors: Maintenance Operator
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