Accident Tolerant Reactor Shutdown for NTP Systems, Phase II

Metadata Updated: March 22, 2019

In brief, USNC's accident submersion safe drums are control drums where a small amount of fuel is added opposite to the neutron absorber and the drums impinge on the active core to substantially increase the shutdown criticality margin of the control drums. Phase 1 results indicate that the shutdown criticality margin is more than sufficient to maintain sub-criticality in the worst-case water submersion accidents. Key accidents that the accident submersion safe drums address include submersion in freshwater and sand with a stuck drum in the full-on position and submersion in water and wet sand with reflector loss.

This SBIR will develop the submersion safe reactor shutdown system for Nuclear Thermal Propulsion (NTP) identified in the Phase 1. Remaining subcritical during a during water submersion accident is a design requirement for NTP systems. As of now, all thermal spectrum NTP concepts (including LEU NTP systems) fail to remain subcritical during water submersion and thus are not water submersion safe. USNC's submersion safe control drums enable thermal spectrum NTP systems to remain subcritical during water submersion accidents.

Key tasks that will be completed include:

1.Develop a detailed integrated thermal-mechanical and neutronic design of the control drums.

2.Design a power cycle and coolant paths that adequately remove heat from the submersion safe drums while minimizing complexity of the NTP system.

3.Demonstrate the Submersion safe control drum technology in a prototypical reactor experiment and raise the technology's TRL up to 4/5.

4.Deliver a set of NTP system point designs that showcase the full implementation of the drums integrated into a realistic NTP system.

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Public: This dataset is intended for public access and use. License: U.S. Government Work

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Metadata Created Date August 1, 2018
Metadata Updated Date March 22, 2019

Metadata Source

Harvested from NASA Data.json

Additional Metadata

Resource Type Dataset
Metadata Created Date August 1, 2018
Metadata Updated Date March 22, 2019
Publisher Space Technology Mission Directorate
Unique Identifier TECHPORT_93323
Maintainer Email
Public Access Level public
Bureau Code 026:00
Metadata Context
Metadata Catalog ID
Schema Version
Catalog Describedby
Datagov Dedupe Retained 20190322035503
Harvest Object Id 8dc3b233-5ebc-4ade-bd13-08916ff9f5e1
Harvest Source Id 39e4ad2a-47ca-4507-8258-852babd0fd99
Harvest Source Title NASA Data.json
Data First Published 2019-04-01
Homepage URL
Data Last Modified 2018-07-19
Program Code 026:027
Source Datajson Identifier True
Source Hash 0a91ea8a579e51df3901b9ff7098d45faadc3328
Source Schema Version 1.1

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