Cracks in nuclear reactor will hit EDF Energy with £120m bill


https://www.theguardian.com/environment/2018/may/06/cracks-nuclear-reactor-threaten-uk-energy-policy-hunsterston

Cracks in nuclear reactor will hit EDF Energy with £120m bill

Problems at Hunterston B in Scotland trigger doubts over six other 1970s and 80s plants

Workers at Hunterston B power station
 Workers at Hunterston B power station. Its prolonged closure is expected to blow a £120m hole in the revenues of its owner, EDF Energy. Photograph: Jeff J Mitchell/Getty Images

The six month closure of one of Britain’s oldest nuclear reactors will burn a £120m hole in the revenues of owner EDF Energy and has raised questions over the reliability of the country’s ageing nuclear fleet.

EDF said this week that it was taking reactor 3 of Hunterston B in Scotlandoffline for half a year, after inspections found more cracks than expected in the graphite bricks at the reactor’s core.

The plant is one of seven Advanced Gas-Cooling Reactors (AGRS) switched on during the 1970s and 80s, several of which have seen their lifetimes extended into the 2020s.

EDF maintains that the prospect of more old reactors having a sustained outage is highly unlikely, but experts said it would pose a significant challenge to power supplies if they did.

Peter Atherton, an analyst at the consultancy Cornwall Insight, said: “Let’s say worst-case scenario they found a big graphite core problem and Hunterston never comes back on.

“That would be a big hole in the plan [for electricity supplies]. The gas-fired power stations, we’ve probably got enough of them, but it would be pretty tight. It would also be a knock-back to carbon targets. You could build more windfarms, but that would take time.”

The Hunterston outage is the longest yet over the graphite issue, which EDF calls a “unique challenge”, and company presentations concede the cracking “will probably limit the lifetime for the current generation of AGRs”.

https://www.theguardian.com/email/form/plaintone/3887
Sign up to the daily Business Today email or follow Guardian Business on Twitter at @BusinessDesk

The graphite core is used to moderate the neutrons in a nuclear reaction, but over time the irradiation degrades the graphite, ultimately leading to cracks. These cause a series of knock-on effects that can impair control of the nuclear reaction.

Advertisement

The UK nuclear regulator points outthat the total number of cracks is well below specified safety limits. It has also welcomed more frequent inspections such as those that led EDF to take the Hunterston reactor offline.

Experts estimate the 40% cut in the power station’s output – it normally supplies enough electricity for 1.8m homes – will cost the French state-owned firm £100m-120m in lost revenue.

That is small compared with the impact of temporary safety closures at EDF’s French plants, which led profits to fall 16% last year, but it is still a blow the company could do without as it ramps up construction of the £20bn Hinkley Point C nuclear power station in Somerset.

EDF will not be the only energy company affected by the outage. Deepa Venkateswaran, an analyst at Bernstein bank, said she thought it would also hurt the price British Gas’s parent company, Centrica, would fetch for its stake in the plants. Centrica recently said it hoped to sell its 20% share by 2020.

Brian Cowell, EDF’s generation managing director, said he was very confident the Hunterston reactor would come back online in mid-November.

So far, significant cracks have only been found at reactors three and four at Hunterston B.

https://interactive.guim.co.uk/uploader/embed/2018/05/nuclear-plants-with-cracks-zip/giv-3902QRkjYb2NS3VM
Advertisement

Hinkley Point B, which came online in the same year as Hunterston, is offline to carry out checks for cracks, which will be completed in three to four weeks.

“The one that will be worrying them is Hinkley [Point B],” said John Large, a nuclear consultant who has advised the UK government.

Hinkley Point has not only become an industry showcase for why new nuclear reactors should be built in the UK, but the old power station is providing electricity for the 3,500-strong workforce constructing the new plant.

Nuclear provides about a fifth of UK electricity, but experts said this week that it would slump to 10% by 2027, as the old plants are retired.

BMI Research said it did not expect Hinkley Point C to come online by 2025 as planned, given recent warnings of further delays to EDF’s Flamanville plant in France, which uses the same reactor design.

Since you’re here …

… we have a small favour to ask. More people are reading the Guardian than ever but advertising revenues across the media are falling fast. And unlike many news organisations, we haven’t put up a paywall – we want to keep our journalism as open as we can. So you can see why we need to ask for your help. The Guardian’s independent, investigative journalism takes a lot of time, money and hard work to produce. But we do it because we believe our perspective matters – because it might well be your perspective, too.

I appreciate there not being a paywall: it is more democratic for the media to be available for all and not a commodity to be purchased by a few. I’m happy to make a contribution so others with less means still have access to information.Thomasine, Sweden

If everyone who reads our reporting, who likes it, helps fund it, our future would be much more secure. For as little as £1, you can support the Guardian – and it only takes a minute. Thank you.

 

發表迴響

在下方填入你的資料或按右方圖示以社群網站登入:

WordPress.com 標誌

您的留言將使用 WordPress.com 帳號。 登出 /  變更 )

Twitter picture

您的留言將使用 Twitter 帳號。 登出 /  變更 )

Facebook照片

您的留言將使用 Facebook 帳號。 登出 /  變更 )

連結到 %s

This site uses Akismet to reduce spam. Learn how your comment data is processed.

【◎心靈研磨坊 - 曼陀羅藏◎】

《心靈研磨坊 ─ 身心體能極限的突破,放慢步調,邁開腳步,輕鬆地悠遊著....》

%d 位部落客按了讚: