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| Section | Objectives |
|---|---|
| Risk-Based Process Safety (RBPS) Framework | - Process Safety Culture - Auditing - Safe Work Practices - Operational Readiness - Hazard Identification and Risk Analysis - Contractor Management - Compliance with Standards - Management of Change - Process Knowledge Management - Conduct of Operations - Management Review and Continuous Improvement - Training and Performance Assurance - Operating Procedures - Metrics and Performance Measurement - Emergency Management - Incident Investigation - Asset Integrity and Reliability |
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質問 # 10
For a vapor explosion that occurs in a closed vessel, the amount of thermodynamic energy that ends up in the overpressure is approximately:
正解：C
解説：
The correct answer is B (50%) because in a closed or confined vessel , a much larger fraction of the released thermodynamic energy is converted into pressure (overpressure) compared to unconfined conditions.
CCPS explains that the degree of confinement and congestion strongly influences explosion severity. In an unconfined environment , only a small fraction of energy (typically 2-5%) contributes to overpressure because gases can expand freely. However, in a closed vessel , expansion is restricted, causing the energy released during combustion to be efficiently converted into pressure rise within the vessel .
This leads to significantly higher pressures, often approaching the adiabatic constant-volume explosion pressure , where a large portion of the energy contributes directly to overpressure. Values around 50% or higher are commonly used as engineering approximations for confined systems.
Options A (2%) applies to unconfined vapor cloud explosions, while C (17.5%) may apply to partially congested systems. Option D (0%) is incorrect since overpressure is the defining feature of an explosion.
CCPS highlights that confinement dramatically increases explosion severity , making proper design, relief systems, and hazard analysis critical for vessels handling flammable materials.
質問 # 11
A Management of Change system should address all types of changes to the process that can be reasonably foreseen.
正解：A
解説：
The correct answer is A (True) because CCPS Risk-Based Process Safety clearly states that a Management of Change (MOC) system must address all types of changes that could impact process safety and can be reasonably anticipated .
These changes include modifications to process technology, equipment, procedures, chemicals, operating conditions, and organizational structure . CCPS emphasizes that even seemingly minor changes can introduce new hazards or alter existing risk profiles, making it essential that they are systematically identified and evaluated.
The phrase "reasonably foreseen" is important. It acknowledges that while not every possible scenario can be predicted, organizations are expected to anticipate typical and credible changes based on experience, design knowledge, and operational practices. This includes both permanent and temporary changes, as well as emergency changes (which may follow an expedited but still controlled process).
A robust MOC system ensures that hazards are assessed, safeguards are reviewed, documentation is updated, and personnel are trained before implementation. Failure to capture foreseeable changes is a common root cause of major process safety incidents.
Therefore, CCPS considers it essential that MOC systems are comprehensive in scope , covering all foreseeable changes to maintain process safety and operational integrity.
質問 # 12
Which of the following are appropriate factors to consider when determining the number of individuals on the incident investigation team? (Select all that apply)
正解：A、C
解説：
According to CCPS guidance on Incident Investigation and Learning , the size and composition of an investigation team must be determined based on the nature and complexity of the incident and the need to ensure an objective, competent, and balanced team . Option A is correct because more complex incidents- especially those involving multiple system failures, significant consequences, or unclear causal chains- require a larger team with diverse technical expertise (e.g., operations, engineering, safety).
Option D is also correct because CCPS emphasizes that investigation teams must be free from bias and include members with different perspectives to avoid premature conclusions or blame-focused outcomes. A balanced team improves the quality of root cause analysis and ensures credible findings.
Option B is incorrect because CCPS does not mandate the inclusion of external consultants or insurance agents in every investigation. While external experts may be useful in complex or specialized cases, they are not always required.
Option C is incorrect because team size should not depend on volunteers , but rather on required competencies and investigation scope. Allowing volunteers to determine team size can lead to inefficiency or lack of needed expertise.
Ultimately, CCPS stresses that investigation teams should be fit-for-purpose , technically capable, and structured to produce reliable, learning-focused outcomes.
質問 # 13
To maintain a dependable Operational Readiness practice (select all that apply):
正解：A、B、C
解説：
The correct answers are A, B, and D because CCPS defines Operational Readiness (often implemented through Pre-Startup Safety Reviews, PSSR) as a systematic and consistently applied process to ensure that facilities are safe to start or restart.
Option A (ensure consistent implementation) is critical because inconsistent application of readiness reviews can lead to missed hazards or incomplete verification , increasing risk during startup. CCPS stresses that the process must be standardized and applied every time applicable conditions arise.
Option B (involve competent personnel) is essential because readiness reviews require multidisciplinary expertise , including operations, engineering, maintenance, and safety professionals. Competent personnel ensure that all aspects of safety, procedures, and equipment are properly evaluated.
Option D (determine scope of readiness reviews) is also correct because clearly defining what changes or situations require a readiness review ensures that the process is applied appropriately and comprehensively.
Option C is incorrect because operational readiness should not be limited to only major changes ; it should also apply to minor changes, startups after shutdowns, and other relevant situations where safety could be impacted.
CCPS emphasizes that effective operational readiness ensures systems, procedures, and personnel are fully prepared before introducing hazards , preventing incidents during startup.
質問 # 14
Management of Change review should be done: (select all that apply)
正解：B、D
解説：
The correct answers are A and B because CCPS defines Management of Change (MOC) as a systematic process applied to all process-related changes across the lifecycle of a facility .
Option A is correct because MOC is specifically required for process-related changes , including modifications to equipment, chemicals, technology, procedures, and operating conditions. These changes can introduce new hazards or alter existing risks, making formal review essential.
Option B is also correct because MOC applies throughout the entire process lifecycle , including design, construction, operation, maintenance, and decommissioning. CCPS emphasizes that changes can occur at any stage, and each must be evaluated for safety impact.
Option C (replacement in kind) is incorrect because true replacement in kind-where there is no change in specifications or function -does not require MOC. However, careful verification is needed to confirm it is truly identical.
Option D is incorrect because confirming operational readiness is part of Pre-Startup Safety Review (PSSR) , not MOC itself. Option E relates to auditing or compliance activities , not the purpose of MOC.
CCPS highlights that effective MOC ensures all changes are reviewed, authorized, and safely implemented , preventing unintended consequences.
質問 # 15
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