SAO PAULO, Aug 18 (Reuters) - Brazilian oil company Prio

said on Monday that local regulator ANP ordered a

production halt at the Peregrino FPSO, citing the need for

improvement in risk management documentation and the unit's

deluge system.

Peregrino is currently operated by Norway's Equinor ( EQNR )

, which has begun making the necessary adjustments,

Prio said in a securities filing. Works are expected to take

between three and six weeks, it added.

Prio is a partner in the Peregrino consortium and is set to

become its operator after agreeing earlier this year to buy

Equinor's ( EQNR ) stake in the oil field. It did not detail the

potential impact of ANP's decision.