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UPDATE 2-EDF to close temporarily Tricastin nuclear plant over flooding risk

* EDF publicly disagrees with regulator closure order

* Says dike strengthening to be carried out within a month

* Plants to shut down in coming days, EDF hopes for Nov restart

* Shut-down increases worry over winter supply, prices jump (Adds comments of EDF executive, share price)

PARIS, Sept 28 (Reuters) - French state-controlled power group EDF said on Thursday it will temporarily shut down all four reactors at its Tricastin nuclear power plant after regulator ASN said it had identified flaws in a dike bordering the plant.

ASN said in a statement that while work was being carried out there was a risk of flooding which could lead to a dangerous accident at the plant, which is located along the Rhone river in the heart of France's Provence wine and tourism region.

The planned shut-down forced EDF to revise lower its overall nuclear output target for 2017, pushing its share price down 3.6 percent - its worst intraday loss in almost three months.

"Flooding could lead to a nuclear fuel meltdown accident in the four reactors at the Tricastin nuclear power plant and make it particularly difficult to implement internal and external emergency management capabilities," ASN said in a statement.

In a highly unusual public disagreement with its regulator, EDF said it did not share ASN's views but would nonetheless implement the decision "without undue delay."

"We are convinced that the Tricastin reactors could remain in operation while the dike reinforcement works are being carried out," Philippe Sasseigne, the head of EDF's French reactor fleet, told reporters on a call.

He added that the four reactors would be switched off in the coming two-three days and that he hoped that they could reopen early November, provided EDF gets ASN clearance to do so.

In the coming month, works will be carried out to strengthen the dike in order to guarantee its ability to withstand a major earthquake.

The four reactors have a combined capacity of 3,600 megawatts. Their shut-down will add to worries in the power market that nuclear-reliant France could face tight power supply in winter after the regulator identified others flaws at separate sites.

French front-month electricity futures jumped 2.54 percent to 42.45 euros per megawatt, remaining just below a year high set earlier this month.

EDF on Thursday lowered its 2017 nuclear generation target to 385-392 TWh, from a previous target of 390-400 TWh.

However, the group confirmed its 2017 and 2018 financial targets in the current price environment.

In a separate probe, ASN has asked the utility to carry out reviews of components in its 58 nuclear reactors in an ongoing investigation into irregularities and falsification of manufacturing documents. (Writing and additional reporting by Geert De Clercq; Editing by Susan Fenton and Richard Lough)