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Finland’s Olkiluoto 3 repairs could take several months – expert

CARL-EMIL WICKSTRÖM, Helsinki, 10 Nov 2022, (Montel) Fixing the cracked feedwater pumps at Finnish nuclear reactor Olkiluoto 3 (1.6 GW) could take several months if the parts need to be manufactured, nuclear expert Juhani Hyvarinen told Montel on Thursday………………

The manufacturing of new impellers would take at least a few months. But changing them does not take long, a few days or maximum a few weeks, including testing.”

The Olkiluoto 3 reactor has been in test production since March but was stopped last month after cracks were found in feedwater pump impellers.

Operator TVO is investigating the issue but has not yet provided estimates of how long the repairs will take or details on part replacements……………………………………….

Risk of further issues?
The reactor’s launch is 13 years beyond schedule already and so the turbine had been idle since being installed over a decade ago.

The risk of further complications remained until the project was complete, said Hyvarinen.

“So far, the common denominator with the issues has been that the turbine facility is a prototype, it is not exactly like the ones used in Germany for decades,” he said…………..

However, the issue may be how the reactor was run, he said, pointing to the frequent ramp ups and down during the commissioning phase.

“Ramping up and down”
“The pumps are not really designed for that and the manufacturer might not have considered there would be so much ramping up and down,” Hyvarinen said.

“The initial problems were on the reactor’s side before moving to the turbine, he noted. “There is a wave of issues from inside of the facility towards the outside”, indicating that if any new issues arose, they would likely be linked to electrical equipment such as generators, he added. https://www.montelnews.com/news/1365685/ol3-repairs-could-take-several-months–expert

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November 11, 2022 - Posted by | Finland, safety

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