The issue of LENR safety boils down to this...can the LENR reaction be partitioned into separate characterizations and functionalities that include the following tentative list of reaction characterizations:
Radiant energy production,
shock wave production,
....strange radiation production.
radioactive isotope elimination
radiation shielding effects,
...vortex tube...triangular foot print
....localized magnetic traps (LMT)
For example, by looking at all the ways in which LENR effects appear and can be produced, what LENR consequences must go together and which are inseparable.
In microbe based LENR, transmutation occurs without any other characterization.
In the Papp engine reaction, shock waves occur, along with electron production and radioactivity suppression, but little or no heat is produced,
In the Hutchinson effect, anti gravity effects appear, matter disintegration occurs, strange radiation is produced, transmutation occurs, electrons are produced.
What LENR engineering must be able to manipulate and the correct theory of LENR must address is how each of these functionalities are produced and how they are matched together as they are currently observed in ALL the various LENR systems that have been discovered. Considering only one or just a few LENR systems is not sufficient to develop a satisfying and useful theory of LENR. By a process of reduction of the globule set of observed LENR behaviors, the theory of LENR shall reduce the cause(s) of the reaction to one or many basic fundamental causes. Any layering of functionality shall be defined between and among these fundamental causes in a hierarchical manor if multiple causes exist.