North Korea Likely to Test Miniaturization of Nuclear Warheads Following Nuclear Test

North Korea Needs to Test Key Technologies Including ICBMs Equipped with Nuclear Warheads

[Asia Economy Yang Nak-gyu, Military Specialist Reporter] The reason North Korea is pursuing nuclear tests is to create nuclear warheads to be mounted on intercontinental ballistic missiles (ICBMs) and other delivery systems. Miniaturizing the nuclear warheads is essential to secure range and safety. However, even if North Korea succeeds in miniaturizing nuclear warheads, there are still challenges to overcome.

The biggest remaining barrier is the atmospheric reentry vehicle technology for ICBMs. Among these, the fairing technology is particularly important. This technology prevents the nuclear warhead from detonating despite the extreme heat of 6000~7000℃ generated when the missile reenters the atmosphere. It is a technology possessed only by a few nuclear-armed countries such as the United States, China, Russia, and India.

The fairing’s outer shell material is primarily carbon fiber. It is a material made by compressing charcoal at high strength, with strength comparable to diamond. Warheads that have this material and technology stably applied are conical in shape. The conical warhead reduces frictional heat during atmospheric reentry and ensures the warhead falls accurately at the target point in a consistent orientation. The special materials required to manufacture reentry vehicles are designated as prohibited items that North Korea cannot import. It is presumed that North Korea has secretly imported materials and technology through third countries.

Even if North Korea has secured reentry vehicle technology, military experts believe it will take considerable time to acquire ICBM-class reentry vehicle technology, as the current technology is at the level of medium-range missiles such as Nodong and Musudan. For this reason, the military assesses North Korea’s claim of having secured ballistic missile reentry vehicle technology as a kind of ‘nuclear bluff’ against international sanctions and South Korea-US joint military exercises.

According to the Korea Aerospace Research Institute, an analysis of flight failure cases from 1957 to 2003 shows that launch failures related to stage separation and fairing separation mechanisms account for 12.6%. The largest cause of flight failures is propulsion system-related issues, accounting for 66.2%. The next major cause of failure is fairing separation problems.

The United States experienced failures due to fairing anomalies in the 1999 Athena launch vehicle, as well as the 1970 Atlas, the same year’s Europa, and the 1964 Atlas launch vehicles. Additionally, failures caused by fairing issues occurred in the 1981 Ukrainian Tsyklon, the 1973 French Diamant, the 1969 Russian Proton, and the 1964 Russian Cosmos-2 launch vehicles.

This content was produced with the assistance of AI translation services.