SMR
Abbreviation with 4 meanings
| Stands for | Small modular reactor |
|---|---|
| Meanings | 4 |
| Categories | Science & Engineering, Medical, Technology & Computing |
SMR has four meanings. The most common are Small modular reactor (energy) and Spinal motion restriction (emergency medicine); it can also stand for Steam methane reforming and Shingled magnetic recording.
Meanings of SMR at a glance
| # | SMR stands for | Context |
|---|---|---|
| 1 | Small modular reactor | Science & Engineering › Energy |
| 2 | Spinal motion restriction | Medical › Emergency Medicine |
| 3 | Steam methane reforming | Science & Engineering › Energy |
| 4 | Shingled magnetic recording | Technology & Computing › Computer Hardware |
1. Small modular reactor
Science & Engineering · Energy Abbreviations
Nuclear reactor with an electrical output of up to about 300 megawatts, designed to be built largely in factories and shipped to sites as modules. Supporters hope SMRs will be cheaper and faster to build than large reactors and suit smaller grids, industrial sites and data centers.
Example: The utility plans to build four SMR units at a former coal plant site to reuse its grid connection.
In 2023 NuScale's 50-megawatt module became the first SMR design certified by the US Nuclear Regulatory Commission, but its first planned project in Idaho was canceled that year over rising costs. Ontario Power Generation has chosen the GE-Hitachi BWRX-300 for its Darlington site, intended as one of the first grid-scale SMRs in North America. Russia operates a floating plant with two small reactors.
2. Spinal motion restriction
Medical · Emergency Medicine Abbreviations
Approach to protecting the spine in trauma patients that limits unnecessary movement using a cervical collar, padding and careful handling, rather than strapping everyone to a rigid backboard.
Example: SMR: C-collar applied, pt self-extricated, secured to stretcher.
A 2018 joint position statement from the American College of Surgeons Committee on Trauma, ACEP and the National Association of EMS Physicians endorsed SMR over routine immobilization. Long backboards cause pain, pressure injuries and breathing restriction. Selective protocols decide who needs a collar.
3. Steam methane reforming
Science & Engineering · Energy Abbreviations
Main industrial method of producing hydrogen, reacting natural gas with high-temperature steam over a nickel catalyst to yield hydrogen, carbon monoxide and then carbon dioxide. SMR supplies most of the hydrogen used in refineries and ammonia plants.
Example: The refinery's SMR unit produces hydrogen for removing sulfur from diesel.
Producing a kilogram of hydrogen by SMR releases roughly 9-10 kilograms of CO2, which is why such hydrogen is called "grey." Adding carbon capture yields "blue" hydrogen, while splitting water with renewable electricity produces "green" hydrogen. In nuclear energy SMR means small modular reactor.
4. Shingled magnetic recording
Technology & Computing · Computer Hardware Abbreviations
Hard drive technology that overlaps data tracks like roof shingles to fit more data on each platter. Rewriting data requires rewriting neighboring tracks, which makes sustained random writes and RAID rebuilds very slow.
Example: Avoid SMR drives for the NAS; a RAID rebuild could take days.
In 2020 Western Digital faced criticism and lawsuits after it was revealed that some WD Red NAS drives used SMR without disclosure; the company then created the Red Plus line with conventional recording. Drive-managed SMR hides the shingling from the computer, while host-managed SMR, used in data centers, lets software organize writes efficiently.
Related abbreviations
More energy abbreviations
- RNG – Renewable natural gas
- RPS – Renewable portfolio standard
- RTO – Regional transmission organization
- SAF – Sustainable aviation fuel
- SoC – State of charge
- SOFC – Solid oxide fuel cell
- SoH – State of health
- STC – Standard test conditions
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More emergency medicine abbreviations
- RTS – Revised Trauma Score
- SALT – Sort, assess, lifesaving interventions, treatment/transport
- SAMPLE – Signs and symptoms, allergies, medications, past history, last oral…
- SIRS – Systemic inflammatory response syndrome
- START – Simple Triage and Rapid Treatment
- SW – Stab wound
- TBSA – Total body surface area
- TCCC – Tactical Combat Casualty Care
See all 97 emergency medicine abbreviations →
This entry is for general education and is not medical advice. Abbreviation use varies between institutions; always confirm in context.