Seilwaith cenedlaethol hanfodol (SCH) yw’r cyfleusterau, y systemau, y safleoedd, y wybodaeth, y bobl a’r rhwydweithiau y mae gwlad yn dibynnu arnynt am ei gweithgareddau pob dydd. Y rhain yw’r sectorau y mae NDEC yn gweithio gyda hwy, gan sicrhau bod Cymru’n ddiogel a’i bod yn gallu ffynnu mewn amgylchedd diogel.
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