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Title: Nitrogen-16 Generation, Transport and Associated Shielding Requirements in the Supercritical-Water-Cooled Reactor

Abstract

As a water-cooled nuclear system with a direct thermal cycle, the supercritical-water-cooled reactor (SCWR) shares with the boiling water reactor (BWR) the issue of coolant activation and transport of the coolant activation products to the turbine and balance of plant (BOP). Consistent with the BWR experience, the dominant nuclide contributing to the SCWR coolant radioactivity at full power is 16N, which is produced by an (n,p) reaction on 16O. In this paper the production and decay of 16N in the SCWR coolant circuit along with the shielding requirements imposed on the BOP are analyzed and compared with those in a BWR with a similar thermal power rating. A simple control-mass approach is adopted in which the 16N inventory in a unit mass of coolant is tracked as the coolant flows in the SCWR and BWR primary systems, which are divided into several compartments (e.g., core, lower plenum, downcomer, etc.) of known volume, mass flow rate, and neutron flux. The values of the neutron flux and (n,p) cross section in the SCWR and BWR cores are calculated by means of full-length radially reflected Monte Carlo eigenvalue models of the SCWR and BWR fuel assemblies. The results are as follows: The 16Nmore » activities in the steam lines of the BWR with normal water chemistry, in the BWR with hydrogen water chemistry, and in the SCWR are about 40, 180, and 380 Ci/g, respectively. The calculated BWR values compare well with the trends and ranges found in the literature. The SCWR 16N concentration is significantly higher than that in the BWR for the following four reasons: 1. The coolant transit time in the SCWR core is about twice that in the BWR core. 2. The neutron flux is higher in the SCWR because of the higher power density. 3. The slow coolant pass in the water rods produces a significant 16N activity at the SCWR core inlet. 4. In the SCWR all the 16N generated in the core is sent to the steam lines because there is no recirculation within the vessel. A simple gamma attenuation model shows that the higher 16N activity in the SCWR results in shielding requirements only up to 10% higher than for the BWR with hydrogen water chemistry. However, because of the higher SCWR electric power, the specific shielding costs per unit of electric power associated with 16N are expected to be similar to or better than that for BWRs.« less

Authors:
Publication Date:
Research Org.:
Idaho National Laboratory (INL)
Sponsoring Org.:
DOE - NE
OSTI Identifier:
912226
Report Number(s):
INEEL/JOU-03-01120
Journal ID: ISSN 0029-5450; NUTYBB; TRN: US0800327
DOE Contract Number:  
DE-AC07-99ID-13727
Resource Type:
Journal Article
Journal Name:
Nuclear Technology
Additional Journal Information:
Journal Volume: 147; Journal Issue: 2; Journal ID: ISSN 0029-5450
Country of Publication:
United States
Language:
English
Subject:
11 - NUCLEAR FUEL CYCLE AND FUEL MATERIALS; COOLANTS; CROSS SECTIONS; EIGENVALUES; ELECTRIC POWER; FLOW RATE; FUEL ASSEMBLIES; HYDROGEN; ISOTOPES; NEUTRON FLUX; NITROGEN 16; POWER DENSITY; SHIELDING; STEAM LINES; TRANSPORT; TURBINES; WATER; WATER CHEMISTRY; coolant activation; nitroen 16; supercritical water cooled reactor; turbine shielding

Citation Formats

Buongiorno, Jacopo. Nitrogen-16 Generation, Transport and Associated Shielding Requirements in the Supercritical-Water-Cooled Reactor. United States: N. p., 2004. Web.
Buongiorno, Jacopo. Nitrogen-16 Generation, Transport and Associated Shielding Requirements in the Supercritical-Water-Cooled Reactor. United States.
Buongiorno, Jacopo. Sun . "Nitrogen-16 Generation, Transport and Associated Shielding Requirements in the Supercritical-Water-Cooled Reactor". United States.
@article{osti_912226,
title = {Nitrogen-16 Generation, Transport and Associated Shielding Requirements in the Supercritical-Water-Cooled Reactor},
author = {Buongiorno, Jacopo},
abstractNote = {As a water-cooled nuclear system with a direct thermal cycle, the supercritical-water-cooled reactor (SCWR) shares with the boiling water reactor (BWR) the issue of coolant activation and transport of the coolant activation products to the turbine and balance of plant (BOP). Consistent with the BWR experience, the dominant nuclide contributing to the SCWR coolant radioactivity at full power is 16N, which is produced by an (n,p) reaction on 16O. In this paper the production and decay of 16N in the SCWR coolant circuit along with the shielding requirements imposed on the BOP are analyzed and compared with those in a BWR with a similar thermal power rating. A simple control-mass approach is adopted in which the 16N inventory in a unit mass of coolant is tracked as the coolant flows in the SCWR and BWR primary systems, which are divided into several compartments (e.g., core, lower plenum, downcomer, etc.) of known volume, mass flow rate, and neutron flux. The values of the neutron flux and (n,p) cross section in the SCWR and BWR cores are calculated by means of full-length radially reflected Monte Carlo eigenvalue models of the SCWR and BWR fuel assemblies. The results are as follows: The 16N activities in the steam lines of the BWR with normal water chemistry, in the BWR with hydrogen water chemistry, and in the SCWR are about 40, 180, and 380 Ci/g, respectively. The calculated BWR values compare well with the trends and ranges found in the literature. The SCWR 16N concentration is significantly higher than that in the BWR for the following four reasons: 1. The coolant transit time in the SCWR core is about twice that in the BWR core. 2. The neutron flux is higher in the SCWR because of the higher power density. 3. The slow coolant pass in the water rods produces a significant 16N activity at the SCWR core inlet. 4. In the SCWR all the 16N generated in the core is sent to the steam lines because there is no recirculation within the vessel. A simple gamma attenuation model shows that the higher 16N activity in the SCWR results in shielding requirements only up to 10% higher than for the BWR with hydrogen water chemistry. However, because of the higher SCWR electric power, the specific shielding costs per unit of electric power associated with 16N are expected to be similar to or better than that for BWRs.},
doi = {},
journal = {Nuclear Technology},
issn = {0029-5450},
number = 2,
volume = 147,
place = {United States},
year = {2004},
month = {8}
}