NS SAVANNAH UPGRADING ANALOG COMPUTER ANALYSIS

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An extensive transient analysis was made of the NS Savannah power plant using analog computer technique to determine the control and safety system actions required to prevent plant damage following operating and accident transients. This work amplified previous design studies by considering accidents of greater severity, automatic limiting devices to preclude safety action, and more realistic parameters based on operating experience. The following transients were analyzed; startup accident, rod withdrawal accident in the power range, excessive steam demand, accidental closing of both steam stop valves, primary flow coastdown, capsize ship accident, ejection of one control rod, determination of maximum and ... continued below

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Pages: 186

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Rosser, R.M. November 1, 1962.

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An extensive transient analysis was made of the NS Savannah power plant using analog computer technique to determine the control and safety system actions required to prevent plant damage following operating and accident transients. This work amplified previous design studies by considering accidents of greater severity, automatic limiting devices to preclude safety action, and more realistic parameters based on operating experience. The following transients were analyzed; startup accident, rod withdrawal accident in the power range, excessive steam demand, accidental closing of both steam stop valves, primary flow coastdown, capsize ship accident, ejection of one control rod, determination of maximum and minimum rates of reactivity change thnt should be available to the control system, and power change-from 100 kw-t to 88 Mw-t to determine the reactivity required to maintain a 20-second period. The minimum rate of reactivity removal necessary to prevert plant damage considered to occur when heat flux exceeds the steady-state level corresponding to departure from nucleate boiling, when the central fuel temperature exceeds 5000 deg F, when primary system pressure exceeds 2200 psia, and when the core is not subcritical following a primary system rupture was considered. The effects of changing set points were also analyzed. The graded protective system automatically limits excursions from normal operating conditions by initiating corrective actions that, in order of increasing severity, are stop rods from withdrawing, insert rods at normal control speeds, and scram rods at high speed. Analysis of the graded protective system involved the selection of setpoints, with the setpoint for the least severe corrective action located closest to the operating value of the parameter. The analysis showed that overpressure considerations dictate the maximum required rate of reactivity removal, which is 3% delta k per second. This rate is recommended for other safety trips. Elimination of several safety inputs, installation of a high pressure ssfety trip, and the relaxation of some setpoints are recommended. On the basis of operating experience to date and the results of this analysis, installntion of the graded protective system did not appear to be justified. The analysis indicated that the presert rod rates available to the controller are adequate and safe. Comparison between computer results and actual Savannah testing results indicates that the analog simulation is reliable for transient studies. (auth)

Physical Description

Pages: 186

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  • Other Information: Orig. Receipt Date: 31-DEC-63

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  • Report No.: BAW-1260
  • Grant Number: AT(30-1)-2721
  • DOI: 10.2172/4741092 | External Link
  • Office of Scientific & Technical Information Report Number: 4741092
  • Archival Resource Key: ark:/67531/metadc1035281

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  • November 1, 1962

Added to The UNT Digital Library

  • Oct. 18, 2017, 7:39 a.m.

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  • Jan. 22, 2018, 1:06 p.m.

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Rosser, R.M. NS SAVANNAH UPGRADING ANALOG COMPUTER ANALYSIS, report, November 1, 1962; Lynchburg, Virginia. (digital.library.unt.edu/ark:/67531/metadc1035281/: accessed September 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.