Three Mile Island’s 60-year shutdown: ‘More akin to a marathon than a sprint’ | TribLIVE.com
Pennsylvania

Three Mile Island’s 60-year shutdown: ‘More akin to a marathon than a sprint’

1424080_web1_ptr-tns-ThreeMileIsland-071819
The Philadelphia Inquirer
Exelon, the nation’s largest nuclear power generator, says it will shut down Unit 1 at the Three Mile Island nuclear power plant complex in September in the absence of any financial support from Pennsylvania.

The Three Mile Island Unit 1 nuclear reactor shutdown, which is set to begin no later than Sept. 30, will take nearly 60 years and $1.2 billion to complete.

The Nuclear Regulatory Commission is outlining Exelon Generation’s plans to decommission TMI Unit 1, whose closure was announced in May after it became clear that the Pennsylvania General Assembly would not approve a financial rescue of the state’s nuclear plants.

Exelon’s decommissioning schedule, which was spelled out in a plan released in April, calls for the immediate removal of Unit 1’s nuclear fuel from the reactor after shutdown. The uranium fuel-rod assemblies would cool in spent fuel pools for three years until they are moved to above-ground sealed canisters in 2022.

But the reactor’s cooling towers and other large components would remain standing until 2074, according to Exelon’s Post-Shutdown Decommissioning Activities Report. All radioactive material would be safely stored or removed from the site by 2078.

A plant decommissioning is “more akin to a marathon than a sprint,” Jack Parrott, senior project manager of the NRC’s reactor decommissioning branch, told reporters in a briefing Tuesday. The NRC’s interest is to oversee decontamination and removal of radioactive material from the site; restoration of the site to a greenfield is managed by the state and the property owner.

Under federal regulations, plant operators have 60 years to clean up a site after a plant closes. The long-term decommissioning method, called SAFSTOR, allows radioactive levels to decline for decades before workers have to dismantle contaminated components, the NRC says.

Exelon said the $1.2 billion cost to decommissioning the plant would be financed from a trust fund into which the power plant’s customers have paid since the plant went online in 1974. Exelon or its successors would be responsible for paying any fund shortfall.

The advantage of the more rapid decontamination strategy is that it allows the owner to employ workers experienced with the plant. It also makes the site available for reuse sooner.

Exelon acquired Unit 1 in 1999, two decades after the infamous nuclear accident that destroyed its twin in the nation’s worst commercial accident. The damaged reactor, owned by FirstEnergy Corp., is now dormant and is awaiting full decommissioning in tandem with the shutdown of Exelon’s plant.

Exelon said that the 837-megawatt reactor, which employs nearly 700 people, would reduce the staffing level to 300 after shutdown. A skeleton workforce of 50 would remain in place after 2022 to secure the site and the 1,200 tons of spent fuel stored in special steel casks.

Categories: News | Pennsylvania
TribLIVE commenting policy

You are solely responsible for your comments and by using TribLive.com you agree to our Terms of Service.

We moderate comments. Our goal is to provide substantive commentary for a general readership. By screening submissions, we provide a space where readers can share intelligent and informed commentary that enhances the quality of our news and information.

While most comments will be posted if they are on-topic and not abusive, moderating decisions are subjective. We will make them as carefully and consistently as we can. Because of the volume of reader comments, we cannot review individual moderation decisions with readers.

We value thoughtful comments representing a range of views that make their point quickly and politely. We make an effort to protect discussions from repeated comments either by the same reader or different readers

We follow the same standards for taste as the daily newspaper. A few things we won't tolerate: personal attacks, obscenity, vulgarity, profanity (including expletives and letters followed by dashes), commercial promotion, impersonations, incoherence, proselytizing and SHOUTING. Don't include URLs to Web sites.

We do not edit comments. They are either approved or deleted. We reserve the right to edit a comment that is quoted or excerpted in an article. In this case, we may fix spelling and punctuation.

We welcome strong opinions and criticism of our work, but we don't want comments to become bogged down with discussions of our policies and we will moderate accordingly.

We appreciate it when readers and people quoted in articles or blog posts point out errors of fact or emphasis and will investigate all assertions. But these suggestions should be sent via e-mail. To avoid distracting other readers, we won't publish comments that suggest a correction. Instead, corrections will be made in a blog post or in an article.