Mr Corbyn faced his first front bench resignation within moments of his victory, as shadow health spokesman Jamie Reed announced he was quitting.
In a letter to the new leader, Mr Reed - whose Copeland constituency includes the Sellafield nuclear reprocessing site - condemned Mr Corbyn's anti-nuclear policies as "poorly informed and fundamentally wrong".
And Mr Reed warned: "No amount of well-meaning protest will protect the NHS, drive up standards, recruit more medical professionals or improve the accessibility of world-class healthcare to the British people. Only an elected Labour government will do this."
Shadow home secretary, and leadership rival Yvette Cooper said she did not expect to take a shadow cabinet post, while shadow work and pensions secretary Rachel Reeves announced she would go to the backbenches when she returns from maternity leave.
Shadow communities secretary Emma Reynolds also said she would not serve under Mr Corbyn.
Liz Kendall, shadow education secretary Tristram Hunt and shadow chancellor Chris Leslie had already indicated during the three-month leadership campaign that they would leave the front benches if the Islington North MP won.
Defence Secretary Michael Fallon said: "Labour are now a serious risk to our nation's security, our economy's security and your family's security.
"Whether it's weakening our defences, raising taxes on jobs and earnings, racking up more debt and welfare or driving up the cost of living by printing money - Jeremy Corbyn's Labour Party will hurt working people.
"This is a very serious moment for our country - the Conservatives will continue to deliver stability, security and opportunity for working people."
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