Skip to main content

EXPLOSIVE TECHNIQUES FOR DISMANTLING OF BIOLOGICAL SHIELD STRUCTURES.

Objective

IN THE DECOMMISSIONING OF REACTOR SYSTEMS, THE REMOVAL OF HEAVY REINFORCED OR PRESTRESSED CONCRETE STRUCTURES, IN WHICH LARGE QUANTITIES OF CONCRETE AND STEEL HAVE BECOME ACTIVATED DURING REACTOR OPERATION, IS CONSIDERED AS A MAJOR PROBLEM.

FOR THE SAFE REMOVAL OF ACTIVATED CONCRETE WITHOUT RELEASE OF RADIOACTIVE MATERIAL, VARIOUS TECHNIQUES ARE BEING CONSIDERED, IN WHICH A HIGH LEVEL OF CONTROL COULD BE IMPOSED. IN THE FOREGOING CEC RESEARCH PROGRAMME TAYLOR WOODROW CONSTRUCTION (TWC), INVESTIGATED CONTROLLED EXPLOSIVE DEMOLITION TECHNIQUES. DURING THE SAME PERIOD, BATTELLE-INSTITUT E.V. FRANKFURT (BF) DEMONSTRATED THE FEASIBILITY OF AN APPROACH USING "LINE CHARGES" AS OPPOSED TO THE "POINT CHARGES" USED BY TWC.

THE PRESENT RESEARCH WORK AIMS AT COMPLEMENTING, IMPROVING AND OPTIMISING THE FOREGOING WORK. EXTENSIVE INVESTIGATIONS WILL BE EXECUTED ON THE ADJUSTMENT OF BLASTING PARAMETERS, MATERIAL AND STRUCTURAL EFFECTS, DRILLING TECHNIQUES, PARTICLE DISTRIBUTION AND ON PROCEDURES FOR REMOTE HANDLING. WORK IS CARRIED OUT JOINTLY - BASED ON A COMMON AND COMPLEMENTARY WORK PROGRAMME - WITH TWC (CONTRACT NR FI1D-0012).

IN A SUPPLEMENTARY AGREEMENT CONCLUDED IN 1988, ADDITIONAL BLASTING TESTS WERE ADDED TO THE WORK PROGRAMME OF BF, IN ORDER TO REINFORCE THE ASSESSMENT OF SIMULTANEOUS BLASTING.

B.1. ADJUSTMENT OF BLASTING PARAMETERS CONSIDERING SEPARATION EFFICIENCY ON FRAGMENT SIZE.

B.1.1. EFFECT ON INITIATION MODE - SEQUENTIAL OR SIMULTANEOUS FIRING . EXECUTION OF SUPPLEMENTARY TESTS (BF).
B.1.2. EFFECT OF CHARGE TYPE AND TAMPING (BF).
B.1.3. EFFECT OF CHARGE DISTRIBUTION - HEXAGONAL AND PARALLEL LINE ARRAYS - (BF).

B.2. MATERIAL AND STRUCTURAL EFFECTS.

B.2.1. EFFECT ON THE GEOMETRICAL SHAPE OF THE STRUCTURE AND OF THE PRESENCE OF A LINER (TWC).
B.2.2. EFFECT OF THE REINFORCEMENT ARRAY (BF + TWC).

B.3. DRILLING AND BORING OF CHARGING HOLES.

B.3.1. ASSESSMENT OF BORING BY SHAPED CHARGES (TWC).
B.3.2. ASSESSMENT OF MECHANICAL DRILLING (BF).

B.4. STUDY OF THE STRUCTURAL RESPONSE OF THE TEST BODY AND FILTERS TO BLASTING IN CLOSED CONTAINMENT EXPERIMENTS.

B.4.1. RESPONSE OF THE TEST BODY AND OF ITS FOUNDATION (BF).
B.4.2. STUDY OF THE BLAST VALVE PRESSURE DISTRIBUTION (BF).
B.4.3. EFFECT OF BLAST ON AIR FILTERS (BF).
B.4.4. THEORETICAL ASSESSMENT AND MODELLING OF BLAST EFFECTS (BF + TWC).

B.5. INVESTIGATION OF GENERATED DUST DURING BLASTING.

B.5.1. ASSESSMENT OF PARTICLE SIZE DISTRIBUTION OF PRODUCED RUBBLE AS A FUNCTION OF CHARGE BURIAL DEPTH (TWC).
B.5.2. EFFECT OF A SPRAY SYSTEM ON MASS AND SIZE DISTRIBUTION (BF).

B.6. FINAL ASSESSMENT AND EVALUATION OF RESULTS, INCLUDING DESK STUDIES ON PROCEDURES FOR REMOTE HANDLING (BF + TWC).

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

Battelle-Institut eV
Address
Am Römerhof 35
60486 Frankfurt Am Main
Germany

Participants (1)

Taylor Woodrow Construction Ltd
United Kingdom
Address
Taywood House 345 Ruislip Road
UB1 2QX Southall