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Title: Preliminary skyshine calculations for the Poloidal Diverter Tokamak Experiment

Abstract

The Poloidal Diverter Experiment (PDX) facility at Princeton University is the first operating tokamak to require substantial radiation shielding. A calculational model has been developed to estimate the radiation dose in the PDX control room and at the site boundary due to the skyshine effect. An efficient one-dimensional method is used to compute the neutron and capture gamma leakage currents at the top surface of the PDX roof shield. This method employs an S /SUB n/ calculation in slab geometry and, for the PDX, is superior to spherical models found in the literature. If certain conditions are met, the slab model provides the exact probability of leakage out the top surface of the roof for fusion source neutrons and for capture gamma rays produced in the PDX floor and roof shield. The model also provides the correct neutron and capture gamma leakage current spectra and angular distributions, averaged over the top roof shield surface. For the PDX, this method is nearly as accurate as multidimensional techniques for computing the roof leakage and is much less costly. The actual neutron skyshine dose is computed using a Monte Carlo model with the neutron source at the roof surface obtained from the slabmore » S /SUB n/ calculation. The capture gamma dose is computed using a simple point-kernel single-scatter method.« less

Authors:
;
Publication Date:
Research Org.:
EG and G Idaho Inc., Idaho Falls, Idaho
OSTI Identifier:
5463704
Resource Type:
Journal Article
Journal Name:
Nucl. Technol./Fusion; (United States)
Additional Journal Information:
Journal Volume: 1:1
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; POLOIDAL DIVERTORS; SHIELDING; RADIATION DOSES; CALCULATION METHODS; TOKAMAK TYPE REACTORS; CAPTURE; LEAKAGE CURRENT; MONTE CARLO METHOD; NEUTRON REACTIONS; POINT KERNELS; BARYON REACTIONS; CURRENTS; DIVERTORS; DOSES; ELECTRIC CURRENTS; HADRON REACTIONS; KERNELS; NUCLEAR REACTIONS; NUCLEON REACTIONS; THERMONUCLEAR REACTORS; 700202* - Fusion Power Plant Technology- Magnet Coils & Fields

Citation Formats

Nigg, D W, and Wheeler, F J. Preliminary skyshine calculations for the Poloidal Diverter Tokamak Experiment. United States: N. p., 1981. Web.
Nigg, D W, & Wheeler, F J. Preliminary skyshine calculations for the Poloidal Diverter Tokamak Experiment. United States.
Nigg, D W, and Wheeler, F J. 1981. "Preliminary skyshine calculations for the Poloidal Diverter Tokamak Experiment". United States.
@article{osti_5463704,
title = {Preliminary skyshine calculations for the Poloidal Diverter Tokamak Experiment},
author = {Nigg, D W and Wheeler, F J},
abstractNote = {The Poloidal Diverter Experiment (PDX) facility at Princeton University is the first operating tokamak to require substantial radiation shielding. A calculational model has been developed to estimate the radiation dose in the PDX control room and at the site boundary due to the skyshine effect. An efficient one-dimensional method is used to compute the neutron and capture gamma leakage currents at the top surface of the PDX roof shield. This method employs an S /SUB n/ calculation in slab geometry and, for the PDX, is superior to spherical models found in the literature. If certain conditions are met, the slab model provides the exact probability of leakage out the top surface of the roof for fusion source neutrons and for capture gamma rays produced in the PDX floor and roof shield. The model also provides the correct neutron and capture gamma leakage current spectra and angular distributions, averaged over the top roof shield surface. For the PDX, this method is nearly as accurate as multidimensional techniques for computing the roof leakage and is much less costly. The actual neutron skyshine dose is computed using a Monte Carlo model with the neutron source at the roof surface obtained from the slab S /SUB n/ calculation. The capture gamma dose is computed using a simple point-kernel single-scatter method.},
doi = {},
url = {https://www.osti.gov/biblio/5463704}, journal = {Nucl. Technol./Fusion; (United States)},
number = ,
volume = 1:1,
place = {United States},
year = {Thu Jan 01 00:00:00 EST 1981},
month = {Thu Jan 01 00:00:00 EST 1981}
}