# Harold Etherington
Harold Etherington (1900–1994) was a nuclear engineer who helped develop the first nuclear submarine power plants and the early boiling-water nuclear power plants, and who later contributed to the safety of commercial nuclear power in the United States.[1](https://nap.nationalacademies.org/nap-cgi/skimchap.cgi?chap=84%E2%80%9389&recid=5427) He directed reactor engineering divisions at [Argonne National Laboratory](https://www.edgepedia.org/argonne-national-laboratory) and edited the *Nuclear Engineering Handbook* (1958). He died on August 2, 1994, at the age of ninety-four.[1](https://nap.nationalacademies.org/nap-cgi/skimchap.cgi?chap=84%E2%80%9389&recid=5427)
| Key facts | |
|---|---|
| Life dates | 1900 – August 2, 1994 (died at ninety-four) [1](https://nap.nationalacademies.org/nap-cgi/skimchap.cgi?chap=84%E2%80%9389&recid=5427) |
| Pre-nuclear career | Allis-Chalmers engineering development and manufacturing, 1942–1946; author of *Modern Furnace Technology* (three editions from 1938) [1](https://nap.nationalacademies.org/nap-cgi/skimchap.cgi?chap=84%E2%80%9389&recid=5427) |
| Oak Ridge | From 1946: section leader, Gaseous Diffusion Plant, then director of the Power Pile Division [1](https://nap.nationalacademies.org/nap-cgi/skimchap.cgi?chap=84%E2%80%9389&recid=5427) |
| Argonne | Later styled "formerly Director, Naval and Reactor Engineering Divisions" |[2](https://thomascsanger.com/thomas-c-sanger/meet-character-ruth-etherington-unlikely-hero-part-2/) • [3](https://archive.org/details/nuclearengineeri0000haro)
| Signature work | Editor, *Nuclear Engineering Handbook* (McGraw-Hill, 1958), more than 70 specialist contributors [3](https://archive.org/details/nuclearengineeri0000haro) |
## Early career
According to [David Okrent](https://www.edgepedia.org/david-okrent)'s memorial tribute in the National Academy of Engineering's *Memorial Tributes, Volume 8*, before nuclear work Etherington was a furnace and power-plant engineer. He wrote *Modern Furnace Technology*, published by Charles Griffin in London; the first of its three editions appeared in 1938.[1](https://nap.nationalacademies.org/nap-cgi/skimchap.cgi?chap=84%E2%80%9389&recid=5427) From 1942 to 1946 he worked for [Allis-Chalmers](https://www.edgepedia.org/allis-chalmers), first on engineering development and later on manufacturing.[1](https://nap.nationalacademies.org/nap-cgi/skimchap.cgi?chap=84%E2%80%9389&recid=5427)
## Oak Ridge and the move to Argonne
Etherington's experience with nuclear work started in 1946 at [Oak Ridge National Laboratory](https://www.edgepedia.org/oak-ridge-national-laboratory), where he initially led a section of the Gaseous Diffusion Plant and subsequently took charge of the Power Pile Division as its director.[1](https://nap.nationalacademies.org/nap-cgi/skimchap.cgi?chap=84%E2%80%9389&recid=5427) That same year Hyman Rickover and his crew came to Oak Ridge for training in nuclear engineering, and while there chose water cooling over gas cooling for submarine propulsion, a decision that set the course of United States power reactors.[4](https://www.ornl.gov/file/engineering-technology-division-1992/display) In 1946 [Alvin M. Weinberg](https://www.edgepedia.org/alvin-m-weinberg) had made a detailed technical study of a water-cooled high-temperature reactor at Clinton Laboratories, and a report by S. Untermyer issued in October 1947 presented a design for a water-cooled submarine nuclear power plant following Weinberg's suggestions.[5](https://www.usni.org/magazines/proceedings/1960/september/development-nuclear-propulsion-navy)
In December 1947 the Atomic Energy Commission announced plans to consolidate reactor development at Argonne National Laboratory near Chicago, and the Power Pile Division, which Etherington directed, was transferred there.[4](https://www.ornl.gov/file/engineering-technology-division-1992/display) On 27 April 1948 the Commission gave formal project status and high priority to the development of a water-cooled reactor for submarine propulsion.[5](https://www.usni.org/magazines/proceedings/1960/september/development-nuclear-propulsion-navy)
## Submarine propulsion and boiling-water reactors
According to an Argonne historical news release, Argonne created its Naval Reactor Division in 1948 to handle the submarine-plant assignment that had been given to the laboratory on December 31, 1947; during the next six years the division helped transform the atomic ship engine from concept into reality. The first prototype, Submarine Thermal Reactor Mark I, was finished in 1953 by Westinghouse at the site now known as the Idaho National Engineering Laboratory, and, according to the Light Water Reactors Technology Development account of reactors designed and built by Argonne National Laboratory, STR Mark II went into the *Nautilus*, which was launched at [Groton, Connecticut](https://www.edgepedia.org/groton-connecticut), on January 21, 1954.[7](https://www.ne.anl.gov/About/reactors/lwr3.html) • [8](https://web.archive.org/web/20170427064440/http:/www.ne.anl.gov/About/hn/news960121.shtml) The division was merged with Argonne's Reactor Division in 1952.[7](https://www.ne.anl.gov/About/reactors/lwr3.html)
The same water-cooled line produced the boiling-water reactor. At the National Reactor Testing Station in Idaho, Argonne designed, built, and operated the BORAX series of experimental boiling water reactors, starting with BORAX-I in 1953; BORAX-I conclusively demonstrated that steam formation within the core is an effective, reliable, and rapid power-limiting process, able to protect properly designed reactors against reactivity excursions that produce reactor periods shorter than 5 milliseconds, and in July 1954 the facility was intentionally destroyed in a final safety experiment.[7](https://www.ne.anl.gov/About/reactors/lwr3.html) On the night of July 17, 1955, Argonne personnel employed BORAX III to generate steam-produced electricity in an amount sufficient to light the town of Arco, Idaho.[9](https://www.osti.gov/servlets/purl/5895196) The direct-cycle Experimental Boiling-Water Reactor (EBWR) followed: it initially produced 20 MW(t) and 5 MW(e), was later operated at up to 100 MW(t), and was built in 19 months, with ground broken in May 1955 and the plant operational in December 1956; some of the first commercial plants were patterned after it.[9](https://www.osti.gov/servlets/purl/5895196) In 1957 Etherington also prepared a set of informal mimeographed memoranda on reactor calculations for Argonne staff interested in a course on the subject, which were well received.[10](https://doi.org/10.2172/12463689)
## Nuclear Engineering Handbook
In 1958 McGraw-Hill published the *Nuclear Engineering Handbook* under Etherington's editorship.[3](https://archive.org/details/nuclearengineeri0000haro) More than 70 contributors, each a specialist in a particular area of nuclear science or engineering, wrote sections covering reactor control, fluid and heat flow, reactor materials, chemistry and chemical engineering, nuclear-power-plant selection, mechanical design and operation of reactors, and isotopes, for engineers, scientists, students, and research workers.[3](https://archive.org/details/nuclearengineeri0000haro) The front matter identifies him at publication as Vice President, Nuclear Products-Erco, Division of ACF Industries, and formerly Director of the Naval and Reactor Engineering Divisions of Argonne National Laboratory.[3](https://archive.org/details/nuclearengineeri0000haro)
## Honors and recognition
In 1978, Etherington was elected to the National Academy of Engineering.[2](https://thomascsanger.com/thomas-c-sanger/meet-character-ruth-etherington-unlikely-hero-part-2/) He afterwards was a member of the Advisory Committee on Reactor Safeguards, the national committee dealing with reactor safeguards, where fellow members frequently sought out his thinking on one issue after another.[1](https://nap.nationalacademies.org/nap-cgi/skimchap.cgi?chap=84%E2%80%9389&recid=5427)
## Assessment: the water-reactor legacy
The two light-water lines Etherington touched diverged in purpose. The boiling-water line, proven self-regulating by BORAX-I and demonstrated at power by the EBWR, supplied one branch of the commercial fleet.[6](http://smithdray1.net/historicallyspeaking/2016/9-26-16%20Birth%20of%20nuclear%20navy.pdf) • [7](https://www.ne.anl.gov/About/reactors/lwr3.html) • [9](https://www.osti.gov/servlets/purl/5895196)
## References
1. [Harold Etherington 1900–1994, Memorial Tributes, Volume 8, National Academy of Engineering](https://nap.nationalacademies.org/nap-cgi/skimchap.cgi?chap=84%E2%80%9389&recid=5427)
2. [Meet the Character: Ruth Etherington, An Unlikely Hero, Part 2 (Thomas C. Sanger)](https://thomascsanger.com/thomas-c-sanger/meet-character-ruth-etherington-unlikely-hero-part-2/)
3. [Nuclear Engineering Handbook, ed. Harold Etherington (McGraw-Hill, 1958), Internet Archive](https://archive.org/details/nuclearengineeri0000haro)
4. [History of the Engineering Technology Division, Oak Ridge National Laboratory 1944–1992](https://www.ornl.gov/file/engineering-technology-division-1992/display)
5. [The Development of Nuclear Propulsion in the Navy, U.S. Naval Institute Proceedings, September 1960](https://www.usni.org/magazines/proceedings/1960/september/development-nuclear-propulsion-navy)
6. [Births of nuclear navy and commercial nuclear power: ORNL's influence](http://smithdray1.net/historicallyspeaking/2016/9-26-16%20Birth%20of%20nuclear%20navy.pdf)
7. [Light Water Reactors Technology Development, Argonne National Laboratory](https://www.ne.anl.gov/About/reactors/lwr3.html)
8. [Lab's early submarine reactor program paved the way for modern nuclear power plants, Argonne news release, January 21, 1996](https://web.archive.org/web/20170427064440/http:/www.ne.anl.gov/About/hn/news960121.shtml)
9. [Experimental Boiling-Water Reactor (EBWR) report, OSTI/DOE](https://www.osti.gov/servlets/purl/5895196)
10. [Reactor Calculations for Amateurs, Argonne National Laboratory report record](https://doi.org/10.2172/12463689)
---
*Topic: Encyclopedia › Technology and the built world › Engineers and computer scientists › Engineers and materials scientists › Researchers in mechanical and aerospace engineering, robotics, and control › Nuclear engineering*
*Initially written Sep 21, 2026 · Reviewed: Sep 25, 2026 · Edited: Sep 25, 2026 · Last review: Sep 25, 2026*
*Copyright 2026 EdgeChat AI, a subsidiary of Biostate AI.*
License: Edgepedia Community License 1.0, https://www.edgepedia.org/edgepedia/license