In May 1998, India carried out its second nuclear device test. Three devices were tested on 11 May, 1998 and other two on 13 May, 1998. The devices were code named as Shakti I, Shakti II, Shakti III, Shakti IV and Shakti V. The word Shakti comes from Sanskrit meaning strength. It is also the name of Hindu Goddess of strength.
"Shakti I" was a two staged thermonuclear device with a theoretical yield of 200KT, which was downgraded to 45KT for test purposes. It was a device designed mainly to produce data to analyze the performance of India's Hydrogen bomb technology for future computer simulations and actual weaponisation and not actually a nuclear warhead. This is the device which is now believed to have failed and fizzled during the test.
"Shakti II" was a purely nuclear warhead, using Plutonium with a yield of 15KT, which can be delivered by jets, missiles or bombers. The device was the improved version of the device tested in 1974. Indigenous made supercomputer Param was used to test and analyze the data to improve the design. The 1998 test was intended to prove the validity of the improved designs.
"Shakti III" - This was an experimental test to study the possibility of using the plutonium used in the nuclear warheads and also to prove India’s capability of controlling and damping an explosion by lowering the yield, as this boosted fission device was of primary yield of 0.3KT.
"Shakti IV" - a 0.5 KT experimental device. The test's only purpose was to collect data about the explosion process and to study the performance of various bomb components.
"Shakti V" - a 0.2 KT experimental device that used U-233, an isotope of uranium not found in nature and produced in India's fast breeder reactors that consume Thorium. This device too was used to collect data. The production, designing, testing of the nuclear devices was done in three labs of defense, Research and Development Organisation (DRDO) and Bhabha Atomic Research Center (BARC).
From BARC, they were taken to Mumbai Airport by Army trucks and from there, by AN-32 transport aircraft of air force, it was taken to Jaisalmer air base. From there again it was transported to Pokhran testing range, all during nights.
It was hot in the Pokhran desert; the temperature reached 43°C on the day of the test. But the critical factor was the wind. Although the tests were underground, they were shallow tests and the sealing of the shaft could not be guaranteed to be leak-proof, as a number of shaft seal failures had already occurred during tests by USA, USSR and UK, despite the shafts being much deeper. Winds blowing toward inhabited areas, as occurred on the morning on 11 May were not acceptable. But, by early afternoon, the winds had died down and the scientists decided to go ahead with the tests.
The three devices (Shakti I, II & III) were detonated simultaneously at 3:43:44.2 p.m. local, as measured by international seismic monitors. Seismic data collected by stations outside India have placed the total magnitude of the first event at 5.3 (+/- 0.4), making it one of the largest seismic events in the world during the 24 hr period during which it occurred. The measured seismic center of the triple event was located at 27.0716 deg N latitude, and 71.7612 deg E longitude, which places it only 2.8 km from the 1974 test site (which was at 27.095 deg N, 71.752 deg E).
Just two days later, on 13 May, at 2:51 a.m. EST, 12.21 p.m. local, two sub-kiloton devices were detonated underground. Due to very low yield, this event was not detected by any of the seismic stations. The Seismic data collected by international stations claimed that the Indian nuclear device Shakti I didn’t worked well, since the claimed yield by the government was not analyzed by the seismic centres and they believe the yield was much lower than expected. That gives an idea about the failure of this first device.
The Indian government reacted by telling that the testing of Shakti I was done simultaneously with Shakti II & III and hence there was a conflict between the seismic waves released from different devices, that could have altered the results recorded by the Seismic stations which were located very far from the testing sites.
Read more:
1.
India's failed thermonuclear weapon - beginning and preparation of Pokhran II
2.
India's failed thermonuclear weapon - International and Domestic reactions
3.
India's failed thermonuclear weapon - Devices and Detonation
4.
India's failed thermonuclear weapon - Admission by the director after 11 years
5.
India's failed thermonuclear weapon - Clinton delinked Indo-US deal from CTBT