English: small modular reactor
Welsh: adweithydd modiwlar bach
Subject: Datblygu economaidd
Welsh definition: Small modular reactors (SMRs) are part of a new generation of nuclear power plant designs being developed in several countries. The objective of these SMRs is to provide a flexible, cost-effective energy alternative.
Welsh context: Mae Bwrdd Cynghori Ardal Fenter Eryri'n archwilio'r potensial i safle Trawsfynydd gael ei ystyried yn lleoliad posibl i ddatblygu adweithyddion modiwlar bach (SMRs). 
Plural: adweithyddion modiwlar bach