Nuclear scientist appearing as NHS boiler explodes (5,4)

I believe the answer is:

niels bohr

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'nuclear scientist' is the definition.
(physicist Niels Bohr)

'as nhs boiler explodes' is the wordplay.
'nhs boiler' can be anagrammed to 'NIELS BOHR'.
Though, I'm unsure how this is indicated.

'appearing' acts as a link.

Can you help me to learn more?

(Other definitions for niels bohr that I've seen before include "Atomic scientist" , "14 [GREAT DANE]" , "Danish physicist" .)

I've seen this clue in The Times.

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