Oak Ridge Today

Spotlight: ORAU’s Abelquist authors 2nd edition of ‘Decommissioning Health Physics’

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Eric Abelquist

Eric Abelquist

Revised handbook provides experienced guidance on technical issues of radiation decommissioning projects

As one of the original authors of the “Multi-Agency Radiation Survey and Site Investigation Manual (MARSSIM),” Oak Ridge Associated Universities Executive Vice President Eric Abelquist released updated information on the cleanup of radioactive sites in the second edition of a new handbook geared toward those involved in characterization or remediation efforts.

Extensively revised and updated, the second edition of “Decommissioning Health Physics: A Handbook for MARSSIM Users” covers release criteria, survey instrumentation, detection sensitivity, statistics, dose modeling, and survey procedures. The handbook is published by CRC Press, a division of the Taylor and Francis Group.

Abelquist served as a member of the multi-agency committee representing the U.S. Department of Defense, U.S. Department of Energy, U.S. Environmental Protection Agency, and U.S. Nuclear Regulatory Commission, who produced the MARSSIM to provide guidance to federal agencies, states, site owners, contractors, and other private entities on how to demonstrate that their site is in compliance with a radiation dose or risk-based regulation, otherwise known as a release criterion. [Read more…]

TVA: Watts Bar Unit 2 more than 90 percent complete, key milestones ahead

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Watts Bar Unit 2 Nuclear Reactor Vessel

The core barrel being lowered into the Watts Bar Unit 2 nuclear reactor vessel. The core barrel is over 33 feet tall and weighs 282,000 pounds and will hold 193 nuclear fuel assemblies. Once operational by the end of 2015, Watts Bar Unit 2 will produce approximately 1,150 megawatts of carbon free electricity, enough for 650,000 homes. (Photo courtesy Tennessee Valley Authority)

 

SPRING CITY—The Tennessee Valley Authority’s Watts Bar Nuclear Plant’s Unit 2 reactor is more than 90 percent complete and moving through key testing to become the nation’s first new nuclear generation of the 21st century.

In the eighth quarterly report since TVA revised its estimate to complete the project, TVA said Monday that Watts Bar Unit 2 continues to meet safety and quality targets and remains on schedule and within budget to become the first U.S. reactor to generate “new” power in nearly two decades, and the first since Watts Bar Unit 1 in 1996.

Watts Bar Unit 2 is projected to begin commercial operation between September 2015 and June 2016, with a most likely date by December 2015. The project has a projected completion cost between $4 billion and $4.5 billion, with a most likely target of $4.2 billion.

Testing of individual and combined plant systems is under way, TVA said in the latest quarterly update, covering February to April 2014. The first major system test, called open vessel testing, began ahead of schedule during the period and was completed earlier this summer. OVT involves pumping water into the reactor vessel through systems used when shutting down the reactor and in support of nuclear operations. [Read more…]

ORNL’s CASL, Westinghouse simulate neutron behavior in nuclear reactor core

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AP1000 Pressurized Water Reactor

CASL is developing and applying new modeling and simulation technology (Virtual Environment for Reactor Applications Core Simulator or VERA-CS) to resolve and predict the detailed neutron distribution of the power-generation reactor core residing in reactor vessels. (Image courtesy of Westinghouse)

Test run signals emergence of the next generation in nuclear power reactor analysis tools

Scientists and engineers developing more accurate approaches to analyzing nuclear power reactors have successfully tested a new suite of computer codes that closely model “neutronics”—the behavior of neutrons in a reactor core.

Technical staff at Westinghouse Electric Company LLC, supported by the research team at the Consortium for Advanced Simulation of Light Water Reactors, or CASL, used the Virtual Environment for Reactor Applications core simulator (VERA-CS) to analyze its AP1000 advanced pressurized water reactor. The testing focused on modeling the startup conditions of the AP1000 plant design. [Read more…]

ORAU renews agreement with U.S. Nuclear Regulatory Commission

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Oak Ridge Associated Universities has renewed a five-year agreement with the U.S. Nuclear Regulatory Commission to continue providing technical assistance for radiological surveys and assessments.

The $5.4 million agreement will last through 2017, an ORAU press release said.

Under the agreement, ORAU will perform laboratory analyses, document reviews, inspections, and surveys related to the decommissioning of previously contaminated reactor and materials sites.

[Read more…]