Tuesday, February 4, 2014
Reading List: Safe Is Not an Option
- Simberg, Rand. Safe Is Not an Option. Jackson, WY: Interglobal Media, 2013. ISBN 978-0-9891355-1-1.
- On August 24th, 2011 the third stage of the Soyuz-U rocket carrying the Progress M-12M cargo craft to the International Space Station (ISS) failed during its burn, causing the craft and booster to fall to Earth in Russia. While the crew of six on board the ISS had no urgent need of the supplies on board the Progress, the booster which had failed launching it was essentially identical to that which launched crews to the station in Soyuz spacecraft. Until the cause of the failure was determined and corrected, the launch of the next crew of three, planned for a few weeks later, would have to be delayed. With the Space Shuttle having been retired after its last mission in July 2011, the Soyuz was the only way for crews to reach or return from the ISS. Difficult decisions had to be made, since Soyuz spacecraft in orbit are wasting assets. The Soyuz has a guaranteed life on orbit of seven months. Regular crew rotations ensure the returning crew does not exceed this “use before” date. But with the launch of new Soyuz missions delayed, it was possible that three crew members would have to return in October before their replacements could arrive in a new Soyuz, and that the remaining three would be forced to leave as well before their craft expired in January. An extended delay while the Soyuz booster problem was resolved would force ISS managers to choose between leaving a skeleton crew of three on board without a known to be safe lifeboat or abandoning the ISS, running the risk that the station, which requires extensive ongoing maintenance by the crew and had a total investment through 2010 estimated at US$ 150 billion might be lost. This was seriously considered. Just how crazy are these people? The Amundsen-Scott Station at the South Pole has an over-winter crew of around 45 people and there is no lifeboat attached which will enable them, in case of disaster, to be evacuated. In case of fire (considered the greatest risk), the likelihood of mounting rescue missions for the entire crew in mid-winter is remote. And yet the station continues to operate, people volunteer to over-winter there, and nobody thinks too much about the risk they take. What is going on here? It appears that due to a combination of Cold War elevation of astronauts to symbolic figures and the national trauma of disasters such as Apollo I, Challenger, and Columbia, we have come to view these civil servants as “national treasures” (Jerry Pournelle's words from 1992) and not volunteers who do a risky job on a par with test pilots, naval aviators, firemen, and loggers. This, in turn, leads to statements, oft repeated, that “safety is our highest priority”. Well, if that is the case, why fly? Certainly we would lose fewer astronauts if we confined their activities to “public outreach” as opposed to the more dangerous activities in which less exalted personnel engage such as night aircraft carrier landings in pitching deck conditions done simply to maintain proficiency. The author argues that we are unwilling to risk the lives of astronauts because of a perception that what they are doing, post-Apollo, is not considered important, and it is hard to dispute that assertion. Going around and around in low Earth orbit and constructing a space station whose crew spend most of their time simply keeping it working are hardly inspiring endeavours. We have lost four decades in which the human presence could have expanded into the solar system, provided cheap and abundant solar power from space to the Earth, and made our species multi-planetary. Because these priorities were not deemed important, the government space program's mission was creating jobs in the districts of those politicians who funded it, and it achieved that. After reviewing the cost in human life of the development of various means of transportation and exploring our planet, the author argues that we need to be realistic about the risks assumed by those who undertake the task of moving our species off-planet and acknowledge that some of them will not come back, as has been the case in every expansion of the biosphere since the first creature ventured for a brief mission from its home in the sea onto the hostile land. This is not to say that we should design our vehicles and missions to kill their passengers: as we move increasingly from coercively funded government programs to commercial ventures the maxim (too obvious to figure in the Ferengi Rules of Acquisition) “Killing customers is bad for business” comes increasingly into force. Our focus on “safety first” can lead to perverse choices. Suppose we have a launch system which we estimate that in one in a thousand launches will fail in a way that kills its crew. We equip it with a launch escape system which we estimate that in 90% of the failures will save the crew. So, have we reduced the probability of a loss of crew accident to one in ten thousand? Well, not so fast. What about the possibility that the crew escape mechanism will malfunction and kill the crew on a mission which would have been successful had it not been present? What if solid rockets in the crew escape system accidentally fire in the vehicle assembly building killing dozens of workers and destroying costly and difficult to replace infrastructure? Doing a total risk assessment of such matters is difficult and one gets the sense that little of this is, or will, be done while “safety is our highest priority” remains the mantra. There is a survey of current NASA projects, including the grotesque “Space Launch System”, a jobs program targeted to the constiuencies of the politicians that mandated it, which has no identified payloads and will be so expensive that it can fly so infrequently the standing army required to maintain it will have little to do between its flights every few years and lose the skills required to operate it safely. Commercial space ventures are surveyed, with a candid analysis of their risks and why the heavy hand of government should allow those willing to accept them to assume them, while protecting the general public from damages from accidents. The book is superbly produced, with only one typographic error I noted (one “augers” into the ground, nor “augurs”) and one awkward wording about the risks of a commercial space vehicle which will be corrected in subsequent editions. There is a list of acronyms and a comprehensive index. Disclosure: I contributed to the Kickstarter project which funded the publication of this book, and I received a signed copy of it as a reward. I have no financial interest in sales of this book.
Posted at February 4, 2014 00:26