V. Suprunov1 , S. Subbotin1 , V. Romanenko1 , S. Lukashenko1
1Institute of Radiation Safety and Ecology, National Nuclear Centre, Kurchatov, Kazakhstan
During an underground nuclear explosion (UNE) a significant volume of rock turns gaseous forming the UNE cavity. The most part of "warfare" borehole (WB) has no signs of surface disturbance, and remains to our time in quasi-stable state. At the same time in a number of epicentral areas of WB structural failures are observed, formed at different times - some partly during UNE, others – much later. The presence of technogenic effects, intense fracturing zones, collapsed pillars and other tectonic destruction make UNE-cavities susceptible to air passage. Increased gas emissions in these areas are expected because of the large number of cracks. It is obvious that the increased gas emissions implies the presence of technogenic effects of the UNE in rocks. One of the signs of long-term processes of rock destruction in the epicentral area leads to gas emission, which allows one to identify potentially dangerous WB susceptible to collapse from measurements at the surface. WBs at the site "Balapan", which may be categorized as dangerous objects are: 1010, 1086, 1053, 1223, 1201, 1234, 1236, 1309, 1315, 1316, 1318, 1322, 1323, 1325, 1326, 1328, 1331 1340, 1355, 1421 "Deep". WB at the site "Sary-Uzen", which may be categorized as dangerous objects: 102, 104 and 111.