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					Act as a System Safety Engineer specializing in Fault Tree Analysis (FTA).
Your TASK is to help set up the initial levels of a Fault Tree for the `{system_description_text}`.
The TOP EVENT (the main undesired failure) is: `{undesired_top_event_failure_description}`.
Consider the `{key_subsystems_or_components_list_csv}` (CSV: 'Subsystem_Or_Component_Name
Brief_Function') as potential contributors.
You should propose immediate contributing events (intermediate events or basic events) and the logical gates (AND
 OR) that connect them to the Top Event or to each other at the first couple of levels.

**FAULT TREE ANALYSIS - INITIAL STRUCTURE (MUST be Markdown format):**

**System Under Analysis**: `{system_description_text}`
**Top Undesired Event**: `{undesired_top_event_failure_description}`

**Level 0: Top Event**
```mermaid
graph TD
    TE(`{undesired_top_event_failure_description}`")
```

**Level 1: Immediate Contributing Events / Sub-System Failures**
    *   **Guidance**: Think about the major ways the Top Event could occur. These could be failures of major subsystems listed in `{key_subsystems_or_components_list_csv}` or general failure categories. Determine if these immediate causes need to ALL occur (AND gate) or if ANY ONE of them occurring is sufficient (OR gate) to cause the Top Event.

    **Proposed Structure (Example - AI to generate based on inputs):**
    *   *If the Top Event can be caused by failure of Subsystem A OR Subsystem B OR an External Event:*
    ```mermaid
    graph TD
        TE("`{undesired_top_event_failure_description}`") -->|OR Gate G1| IE1("Failure of [Subsystem A Name from CSV]")
        TE -->|OR Gate G1| IE2("Failure of [Subsystem B Name from CSV]")
        TE -->|OR Gate G1| IE3("Relevant External Event Causing Failure
 e.g.
 Power Loss")
    ```
    *   *If the Top Event occurs only if Component X AND Component Y fail simultaneously:*
    ```mermaid
    graph TD
        TE("`{undesired_top_event_failure_description}`") -->|AND Gate G2| BE1("Failure of [Component X Name from CSV]")
        TE -->|AND Gate G2| BE2("Failure of [Component Y Name from CSV]")
    ```

**Level 2: Further Breakdown of Level 1 Intermediate Events (Illustrative for one branch)**
    *   **Guidance**: Take ONE of the Intermediate Events (IE) from Level 1 and break it down further. Identify how that specific subsystem or intermediate event could fail.
    *   **Example (Continuing from OR Gate G1
 focusing on IE1 'Failure of Subsystem A'):**
        *   *If 'Failure of Subsystem A' can be caused by 'Component A1 Failure' OR 'Component A2 Failure':*
        ```mermaid
        graph TD
            TE("`{undesired_top_event_failure_description}`") -->|OR Gate G1| IE1("Failure of [Subsystem A Name]")
            TE -->|OR Gate G1| IE2("Failure of [Subsystem B Name]")
            TE -->|OR Gate G1| IE3("External Event")
            IE1 -->|OR Gate G1A| BE_A1("Failure of [Component A1 of Subsystem A]")
            IE1 -->|OR Gate G1A| BE_A2("Failure of [Component A2 of Subsystem A]")
        ```
        *   The events BE_A1
 BE_A2 would be ""Basic Events"" if they represent the limit of resolution (e.g.
 a specific part failing
 human error
 software glitch) for this initial setup
 or they could be further developed Intermediate Events.

**Key Considerations for Further Development by User:**
    *   **Basic Events**: These are typically failures of individual components
 human errors
 or external events that require no further decomposition. Their probabilities of occurrence are often estimated from historical data
 handbook data
 or expert judgment.
    *   **Gate Logic**: Carefully determine if contributing events need an AND gate (all must occur) or an OR gate (any one can cause the higher-level event).
    *   **Mutual Exclusivity**: Assume events are independent unless otherwise specified.
    *   **Data Requirements**: For a quantitative FTA
 failure probabilities for all basic events are needed.
    *   **Common Cause Failures**: Consider if a single event could cause multiple basic events to fail simultaneously (this adds complexity beyond this initial setup but is important for full FTA).

**AI's Proposed Initial Breakdown (specific to your inputs):**
    *(The AI should now provide a concrete proposed Mermaid diagram snippet for Level 0 and Level 1
 and one branch of Level 2
 based on the user's specific `{system_description_text}`
 `{undesired_top_event_failure_description}`
 and `{key_subsystems_or_components_list_csv}`. It should make reasonable assumptions about how these subsystems might contribute to the top event
 stating the gate logic clearly.)*
    ```mermaid
    graph TD
        TE("`{undesired_top_event_failure_description}`")
        // AI will populate the connections and Level 1 / Level 2 events here
        // Example: If key_subsystems_or_components_list_csv includes 'Hydraulic_Pump
Provides_Pressure' and 'Control_Valve
Directs_Flow'
        // and top event is 'System_Fails_to_Actuate'
        // TE -->|OR Gate G_Main| Pump_Failure("Hydraulic Pump Fails")
        // TE -->|OR Gate G_Main| Valve_Failure("Control Valve Fails")
        // TE -->|OR Gate G_Main| Electrical_Failure("Control System Electrical Failure")
        // Pump_Failure -->|OR Gate G_Pump| Motor_Fails("Pump Motor Fails (Basic Event)")
        // Pump_Failure -->|OR Gate G_Pump| Pump_Internal_Leak("Pump Internal Leakage (Basic Event)")
    ```

**IMPORTANT**: This prompt generates a STARTING POINT for an FTA. A complete FTA is a detailed and iterative process. The Mermaid syntax is provided to suggest a visual structure; the user would use FTA software or draw this out. The AI's main role here is to structure the initial decomposition logically."