Finlay Spratt, of the Prison Officers Association, said the complaints had been properly investigated by the PSNI.
Lou Ralls, chairman of the Portsmouth branch of the Prison Officers Association, said staff were "buoyant" despite the closure.
Tony Merrick from the Prison Officers Association (POA) has said he was "confident" there would be no compulsory redundancies at HMP Shrewsbury.
BBC: HMP Shrewsbury: MP calls for talks with Prisons Minister
The Prison Officers Association said it would not decide until Tuesday.
Brian Clarke, from the Prison Officers Association, said the attack happened as guards were dealing with a prisoner who was on "special conditions" and required three officers to look after him.
The Prison Officers' Association said they had no confidence in Robin Masefield, Mark McGuckin and Max Murray.
However, the Prison Officers' Association said the award did go far enough to recognise the work of its members.
The Prison Officers' Association will be meeting ministry officials in a fortnight to continue their talks over pay and conditions.
BBC: NEWS | UK | UK Politics | Analysis: Prison challenges ahead
But change is painfully slow and is often resisted by the Prison Officers' Association, the deeply conservative union representing guards.
But Ralph Valerio, from the Prison Officers' Association, said that would potentially be "damaging to the external forces in the economy".
Campaigners, including Finlay Spratt, the chairman of the Prison Officers' Association, handed over a petition signed by thousands people to Justice Minister David Ford.
If the Prison Officers' Association joined in Serwotka would be isolated.
In a joint statement, the Northern Ireland Office and the Prison Officers' Association confirmed that negotiations would take place over four weeks and would include staffing issues.
BBC: NEWS | UK | Northern Ireland | Details of prison deal released
The Prison Officers' Association said there could also be job losses at HMP Liverpool, Young Offenders Institute Lancaster Farms in Preston, and HMP Kennet in Maghull, Merseyside.
The head of the Prison Officers' Association Finlay Spratt said that he was not opposed to his members being disciplined if a breach in their code of conduct had occurred but that "agreed procedures" had to be followed.
Prison Officers Association chairman Finlay Spratt welcomed the report which, he said, had addressed the safety issues within the prison.
Prison Officers' Association chairman Colin Moses admitted there was cultural ignorance in the service but said his members would take Mr Justice Keith's report on board.
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