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Wednesday, August 5, 2020 | History

3 edition of Examination of relocated fuel debris adjacent to the lower head of the TMI-2 reactor vessel found in the catalog.

Examination of relocated fuel debris adjacent to the lower head of the TMI-2 reactor vessel

Examination of relocated fuel debris adjacent to the lower head of the TMI-2 reactor vessel

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Published by Division of Systems Research, Office of Nuclear Regulatory Research, U.S. Nuclear Regulatory Commission, Supt. of Docs., U.S. G.P.O. [distributor] in Washington, DC .
Written in

    Subjects:
  • Three Mile Island Nuclear Power Plant (Pa.),
  • Radioactive substances -- Pennsylvania -- Analysis.,
  • Nuclear power plants -- Accidents -- Pennsylvania.,
  • Nuclear reactor accidents -- Pennsylvania.

  • Edition Notes

    Statementprepared by D.W. Akers, S.M. Jensen, B.K. Schuetz.
    ContributionsJensen, S. M., Schuetz, B. K., U.S. Nuclear Regulatory Commission. Office of Nuclear Regulatory Research. Division of Systems Research., Idaho National Engineering Laboratory., EG & G Idaho.
    The Physical Object
    FormatMicroform
    Paginationxi, 68, [64] p.
    Number of Pages68
    ID Numbers
    Open LibraryOL17681660M

    A simple novel analysis procedure for IVR calculation in core-molten severe accident. Examination of relocated fuel debris adjacent to the lower head of the TMI-2 reactor vessel. Post-accident examinations of the TMI-2 reactor core and lower plenum found that approximat kg (19 metric tons) of molten material had relocated onto the lower head of the reactor vessel. Results of the OECD TMI-2 Vessel Investigation Project concluded that a localized hot spot of approximately 1 meter diameter had existed on the.

    Reactor Decommissioning History Three Mile Island Unit 2 (TMI-2) revised FEB Overview. TMI-2 was a commercial power PWR reactor. It had a generating capacity of MWe and MWt. It operated from December to March when a partial meltdown occurred. Amount of full power days was relatively low. Corium behavior in the lower plenum of the reactor vessel during a severe accident is very important, as this affects a failure mechanism of the lower head vessel .

    Post-accident examinations of the TMI-2 reactor core and lower plenum found that approximat kg (19 metric tons) of molten material had relocated onto the lower head of the reactor vessel. sumed the fuel to be in the lower head with the most highly enriched fuel (approximately 3% u) surrounded by a mixture of the remaining fuel. The bottom surface was reflected by the steel vessel, while the upper surface was somewhat rounded. Optimum moderation was chosen, and all fuel cladding and solid control materials were removed.


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Examination of relocated fuel debris adjacent to the lower head of the TMI-2 reactor vessel Download PDF EPUB FB2

Post-accident examinations of the TMI-2 reactor core and lower plenum found that approximat kg (19 metric tons) of molten material had relocated onto the lower head of the reactor vessel. Results of the OECD TMI-2 Vessel Investigation Project concluded that a localized hot spot of approximately 1 meter diameter had existed on the lower head.

As part of the Three Mile Island Unit 2 (TMI-2) Vessel Investigation Project, funded by the Organization for Economic Cooperation and Development, physical, metallurgical, and radiochemical examinations were performed on samples of previously molten material that had relocated to the lower plenum of the TMI-2 reactor during the accident of 28 March Cited by: 8.

Examination of Relocated Fuel Debris Adjacent to the Lower Head of the TMI-2 Reactor Vessel Manuscript Completed: Februaxy Date Published: March Prepared by D. Akers, S. Jensen, B.

Schuetz Idaho National Engineering Laboratory Managed by the U.S. Department of Energy EG&G Idaho, Inc. Idaho Falls, ID Prepared for. Get this from a library. Examination of relocated fuel debris adjacent to the lower head of the TMI-2 reactor vessel.

[D W Akers; S M Jensen; B K Schuetz; U.S. Nuclear Regulatory Commission. Office of Nuclear Regulatory Research. Division of Systems Research.; Idaho National Engineering Laboratory.; EG & G Idaho.].

TMI-2 REACTOR VESSEL LOWER HEAD HEATUP CALCULATIONS. INTRODUCTION. On Mathe Three Mile Island Unit 2 (TMI-2) nuclear reactor experienced a small-break loss-of-coolant accident (LOCA). The accident eventually led to uncovery, rapid heatup, and degradation of the Size: 1MB.

"Examination of relocated fuel debris adjacent to the lower head of the TMI-2 reactor vessel". doi: / ^ "The Famous Photo of Chernobyl's Most Dangerous Radioactive Material Was a Selfie".

Examination of the prior molten debris that relocated to the lower reactor vessel head indicated the presence of measurable amounts of silver, the least volatile control material. These data suggest that the silver had relocated from the central core region prior to when the molten debris relocated to the lower plenum of the by: 8.

In-Vessel Retention (IVR) of core melt is a key severe accident management strategy adopted by operating nuclear power plants and advanced light water reactors (ALWRs), AP, AP, etc. External Reactor Vessel Cooling (ERVC), which involves flooding the reactor cavity to submerge the reactor vessel in an attempt to cool core debris relocated to the vessel low head, is a Cited by: Intentional depressurization and cavity flooding are two important measures in current severe accident management guidelines (SAMGs).

An extreme scenario of an extended station blackout (ESBO), when electric power is unavailable for more than 24 hours, actually occurred in the Fukushima Daiichi accident and attracted lots of attention. In an ESBO, the containment spray Cited by: 3. Which of the following statements concerning the nuclear reactor accident at TMI-2 is not true.

Excess cancer deaths have been predicted to occur in the 2 million people living within 50 miles of the plant at the time of the accident.

Excess cancer deaths have not been predicted to occur in the 2 million people. 15 prism-shaped steel samples were removed from the lower head of the damaged Three Mile Island Unit 2 (TMI-2) nuclear reactor pressure vessel to assess the effects of approximately 19 tonne of molten core debris that had relocated there during the loss-of-coolant by: 2.

The US Nuclear Regulatory Commission, in partnership R.K. McCardell et al. / TMI-2 core sample examinations with the Organization for Economic Cooperation and Development, has initiated a program to obtain and examine samples from the TMI-2 lower reactor pressure vessel head and from debris located adjacent to the lower by: 8.

Island Vessel Investigation Project.; Boston (United States).; Oct ; Organisation for Economic Co-Operation and Development.; Paris (France).; Book Nuclear Energy Agency of the OECD (NEA) 3 Examination of relocated fuel debris adjacent to the lower head of the TMI-2 reactor vessel Akers, DW; Jensen, SM; Schuetz, BK; EG.

A coolant mass flow of 60 kg/s via the downcomer was considered. The results showed that even at a lower system pressure of 10 bar (compared to. STATUS OF DISASSEMBLY OF THE DAMAGED TMI-2 REACTOR CORE GREG R.

EIDAM BECHTEL NATIONAL, INC. The March accident of the Three Mile Island Unit 2 (TMI-2) pressurized water reactor was the most severe accident to occur in a commercial operating power reactor in the United States.

As the pressure vessel was filled with water at the time of the second core relocation, quenching of the accumulated debris as a result of submersion in water was also considered in three of the five cases studied.

Analytical model Figure 1 shows the geometry of the penetration nozzle, the lower head of the TMI-2 reactor pressure vessel and Cited by: 3. TMI-2 has been in a non-operating status since that time. The licensee conducted a substantial program to defuel the reactor vessel and decontaminate the facility.

All spent fuel has been removed except for some debris in the reactor coolant system. The plant defueling was completed in April   Relocation of Fuel Debris to the Lower Head of the TMI2 Reactor Vessel-A Possible Scenario TMI 2 Pressure Vessel Investigation Project Proc.

Open forum OECD/NEA and USNRC Boston, USAAuthor: Payot Frédéric, Seiler Jean-Marie. Information and Examination Program in managing fuel and special radioactive wastes resulting from the accident at the Unit 2 reactor of the Three Mile Island Nuclear Power Station (TMI-2).

and the USA. Of course, actual examination of specimens from the reactor could not start until the vessel was defueled and the debris on the lower head was mapped, sampled, and removed. InMPR Associates Inc.

of Alexandria, Virginia, was hired to remove metallurgical test specimens from the lower head using a remote-controlled electrical.

As part of the Three Mile Island Unit 2 (TMI-2) Vessel Investigation Project, funded by the Organization for Economic Cooperation and Development, physical, metallurgical, and radiochemical examinations were performed on samples of previously molten material that had relocated to the lower plenum of the TMI-2 reactor during the accident of 28 March Korth, G.

E.,“Peak Accident Temperatures of the TMI-2 Lower Pressure Vessel Head,” Contribution to the TMI-2 Vessel Investigation Project Integration Report, NUREG/CR Kumar, R. K. et al.,“Intermediate Scale Combustion Studies of Hydrogen-Air-Steam Mixtures,” EPRI Report NP File Size: 8MB.Modeling for Evaluation of Debris Coolability in Lower Plenum of Reactor Pressure Vessel.

cay heat from the debris mass relocated to the TMI-2 lower.