skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Some peculiarities of checking the Topaz-2 system coolant filling quality

Abstract

This paper contains the analysis of validity of methods used for checking the Topaz-2 system coolant filling quality by a metering tank according to the mathematical model developed. A number of criteria is proposed for detecting occluded gas in the coolant loop. {copyright} {ital 1996 American Institute of Physics.}

Authors:
; ;  [1]
  1. Central Design Bureau of Machine Building (CDBMB), Krasnogvardeyskaya Square 3, St. Petersburg, Russia, 195272
Publication Date:
OSTI Identifier:
385490
Report Number(s):
CONF-960109-
Journal ID: APCPCS; ISSN 0094-243X; TRN: 96:026249
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 361; Journal Issue: 1; Conference: STAIF 96: space technology and applications international forum, Albuquerque, NM (United States), 7-11 Jan 1996; Other Information: PBD: Mar 1996
Country of Publication:
United States
Language:
English
Subject:
21 NUCLEAR POWER REACTORS AND ASSOCIATED PLANTS; 42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; SPACE POWER REACTORS; COOLANT LOOPS; THERMIONIC CONVERTERS; THERMIONIC FUEL ELEMENTS; MATHEMATICAL MODELS; HEAT TRANSFER; SPACECRAFT POWER SUPPLIES; SPACE FLIGHT; NESDPS Office of Nuclear Energy Space and Defense Power Systems

Citation Formats

Ogloblin, B.G., Svishchev, A.M., and Shalaev, A.I. Some peculiarities of checking the Topaz-2 system coolant filling quality. United States: N. p., 1996. Web. doi:10.1063/1.49891.
Ogloblin, B.G., Svishchev, A.M., & Shalaev, A.I. Some peculiarities of checking the Topaz-2 system coolant filling quality. United States. doi:10.1063/1.49891.
Ogloblin, B.G., Svishchev, A.M., and Shalaev, A.I. Fri . "Some peculiarities of checking the Topaz-2 system coolant filling quality". United States. doi:10.1063/1.49891.
@article{osti_385490,
title = {Some peculiarities of checking the Topaz-2 system coolant filling quality},
author = {Ogloblin, B.G. and Svishchev, A.M. and Shalaev, A.I.},
abstractNote = {This paper contains the analysis of validity of methods used for checking the Topaz-2 system coolant filling quality by a metering tank according to the mathematical model developed. A number of criteria is proposed for detecting occluded gas in the coolant loop. {copyright} {ital 1996 American Institute of Physics.}},
doi = {10.1063/1.49891},
journal = {AIP Conference Proceedings},
number = 1,
volume = 361,
place = {United States},
year = {Fri Mar 01 00:00:00 EST 1996},
month = {Fri Mar 01 00:00:00 EST 1996}
}
  • This paper deals with processes of the first filling of the TFE interelectrode spaces of the TOPAZ-2 nuclear power system, which are performed at the stage of checkout testing. Given a data and their discussion. {copyright} {ital 1996 American Institute of Physics.}
  • The paper presents some results of calculational analyses performed to determine thermal state of the TOPAZ II safety system structure, radiation shielding, reactor without the side reflector, rods and inserts of the side reflector under conditions of fire at the launch pad when an accident occurs to a launch vehicle. {copyright} {ital 1996 American Institute of Physics.}
  • Purpose: To develop a system that can define the radiation isocenter and correlate this information with couch coordinates, laser alignment, optical distance indicator (ODI) settings, optical tracking system (OTS) calibrations, and mechanical isocenter walkout. Methods: Our team developed a multi-adapter, multi-purpose quality assurance (QA) and calibration device that uses an electronic portal imaging device (EPID) and in-house image-processing software to define the radiation isocenter, thereby allowing linear accelerator (Linac) components to be verified and calibrated. Motivated by the concept that each Linac component related to patient setup for image-guided radiotherapy based on cone-beam CT should be calibrated with respect tomore » the radiation isocenter, we designed multiple concentric adapters of various materials and shapes to meet the needs of MV and KV radiation isocenter definition, laser alignment, and OTS calibration. The phantom's ability to accurately define the radiation isocenter was validated on 4 Elekta Linacs using a commercial ball bearing (BB) phantom as a reference. Radiation isocenter walkout and the accuracy of couch coordinates, ODI, and OTS were then quantified with the device. Results: The device was able to define the radiation isocenter within 0.3 mm. Radiation isocenter walkout was within ±1 mm at 4 cardinal angles. By switching adapters, we identified that the accuracy of the couch position digital readout, ODI, OTS, and mechanical isocenter walkout was within sub-mm. Conclusion: This multi-adapter, multi-purpose isocenter phantom can be used to accurately define the radiation isocenter and represents a potential paradigm shift in Linac QA. Moreover, multiple concentric adapters allowed for sub-mm accuracy for the other relevant components. This intuitive and user-friendly design is currently patent pending.« less
  • Purpose: Late toxicity from radiation to critical structures limits the possible dose in Radiation Therapy. Perfectly conformal treatment of a target is not realizable, so the clinician must accept a certain level of collateral radiation to nearby OARs. But how much? General guidelines exist for healthy tissue sparing which guide RT treatment planning, but are these guidelines good enough to create the optimal plan given the individualized patient anatomy? We propose a means to evaluate the planned dose level to an OAR using a multi-institutional data-store of previously treated patients, so a clinician might reconsider planning objectives. Methods: The toolmore » is built on Oncospace, a federated data-store system, which consists of planning data import, web based analysis tools, and a database containing:1) DVHs: dose by percent volume delivered to each ROI for each patient previously treated and included in the database.2) Overlap Volume Histograms (OVHs): Anatomical measure defined as the percent volume of an ROI within a given distance to target structures.Clinicians know what OARs are important to spare. For any ROI, Oncospace knows for which patients’ anatomy that ROI was harder to plan in the past (the OVH is less). The planned dose should be close to the least dose of previous patients. The tool displays the dose those OARs were subjected to, and the clinician can make a determination about the planning objectives used.Multiple institutions contribute to the Oncospace Consortium, and their DVH and OVH data are combined and color coded in the output. Results: The Oncospace website provides a plan quality display tool which identifies harder to treat patients, and graphically displays the dose delivered to them for comparison with the proposed plan. Conclusion: The Oncospace Consortium manages a data-store of previously treated patients which can be used for quality checking new plans. Grant funding by Elekta.« less
  • The influence of accelerated electrons on the highfrequency accelerating system in a high-energy synchrotron was investigated. It is shown thnt along with the active load in the feeding generator produced by accelerated electrons, it is also necessary to consider the reactive load. It is also indicated that the division of acceleration into separate parts induces energy losses due to the positive resonator excitation by accelerated electrons. Means are shown for reducing such losses. (R.V.J.)