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NEBOSH Process Safety Management 2026 (NEBOSH PSM) – 200+ Questions on HAZOP, SIL, Asset Integrity, COMAH and Emergency Planning

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This document contains over 200 expertly verified exam questions and answers for the NEBOSH Process Safety Management (PSM) 2026 qualification, structured across 12 concise and focused revision pages. It provides clear definitions and explanations of key process safety terminology, including immediate and root causes, Management of Change (MOC), competence, consultation, hazard, risk, auditing, ALARP, and the Plan–Do–Check–Act (PDCA) cycle. The material comprehensively covers core regulatory and management frameworks such as COMAH (Control of Major Accident Hazards Regulations 2015), Major Accident Prevention Policy (MAPP), qualitative and quantitative risk assessment methods (QRA), barrier models including the Swiss Cheese model, and formal hazard analysis techniques such as HAZOP, HAZID, FMEA, RPN, and Event Tree Analysis (ETA). It also explains Process Hazard Analysis (PHA) review requirements and Standard Operating Procedures (SOPs). Technical engineering and operational safety topics are thoroughly addressed, including Safety Critical Elements (SCE), Performance Standards (PS), FARSI principles (Functionality, Availability, Reliability, Survivability, Interdependency), Safety Instrumented Systems (SIS), Safety Integrity Levels (SIL), Probability of Failure on Demand (PFD), Mean Time Between Failures (MTBF), Emergency Shutdown systems (ESD), Remotely Operated Shutoff Valves (ROSOV), and Uninterruptible Power Supply (UPS). Asset integrity management is explained through its full lifecycle (design through decommissioning), maintenance strategies (breakdown, condition monitoring, planned preventive maintenance), permit-to-work systems, LOTO, double block and bleed isolation, and ATEX hazardous area classification. The document also explores fire and explosion hazards including BLEVE, CVCE, UVCE, heat transfer mechanisms (conduction, convection, radiation), bund capacity requirements (110% of tank volume), flammable atmospheres, inerting principles, Legionella temperature survival range (20°C–55°C), electrostatic discharge limitations, zoning classifications (Zone 0, 1, 2, 20, 21, 22), and emergency planning elements such as on-site and off-site plans, roll call procedures, and tabletop exercises. This resource is directly aligned with the NEBOSH Certificate in Process Safety Management syllabus and is ideal for HSE practitioners, process engineers, plant managers, supervisors, maintenance engineers, and safety professionals preparing for certification examinations in high-hazard industries such as oil and gas, petrochemicals, pharmaceuticals, manufacturing, and energy. Keywords: NEBOSH Process Safety Management 2026 exam, COMAH 2015 regulations, major accident prevention policy MAPP, ALARP risk reduction principle, HAZOP HAZID FMEA ETA analysis, risk priority number RPN calculation, safety instrumented system SIS components, safety integrity level SIL 1 2 3 4, probability of failure on demand PFD, asset integrity lifecycle management, permit to work LOTO isolation procedures, double block and bleed isolation, ATEX explosive atmosphere zoning, BLEVE CVCE UVCE explosion types, fire triangle heat oxygen fuel, leading and lagging indicators process safety, plan do check act PDCA safety cycle, process hazard analysis five year review, bund capacity 110 percent requirement, emergency response on site off site plan

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NEBOSH Process Safety
Management 2026 Expert
Verified | Ace the Test



Immediate cause - 🧠ANSWER ✔✔The unsafe act or unsafe condition that

leads directly to the consequences (caused harm, damage, etc)


Root cause - 🧠ANSWER ✔✔An underlying circumstance that allowed the

unsafe condition or act to exist (mainly organisational and management

failings)


MOC - 🧠ANSWER ✔✔Management of Change

, Consultation - 🧠ANSWER ✔✔The two-way exchange of information

between parties, in this case between employer and worker. This is far

more effective than the one-way exchange that we see when people are

simply 'informed'


Competence - 🧠ANSWER ✔✔The ability to undertake responsibilities and

to perform activities to a recognised standard on a regular basis... a

combination of practical and thinking skills, experience and knowledge


Leading indicators - 🧠ANSWER ✔✔Proactive measurements of conditions

that monitor process safety before something goes wrong and to see if

things are operating as intended


Lagging indicators - 🧠ANSWER ✔✔Reactive measures that look at failures,

such as the number of injuries, the number of near misses and the number

of spills that are reported, or excursions where plant is operated outside the

intended operational envelope


Auditing - 🧠ANSWER ✔✔This can be defined as the "systematic, objective

critical evaluation of how well an organisation's management system is

performing by examining the evidence"


Hazard - 🧠ANSWER ✔✔Something that has the potential to cause harm

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