111.1.7.1. Safety measures

Check that water hoses are available and connected to the supply. Check

that the operators have the required personal safety equipment and that the

injection site is roped off.

111.1.7.2. Injection procedure

(1) Starting with all outlets from the module plugged and all valves closed, then start the pump and bring it up to the injection line pressure. Open valves 1, B and 2.

(2) Open valve D slightly, close it and read the manometer pressures.

(3) Open valves E and F. Then open valve D slightly to admit pressure to the tube section between valves F and H. Close valve D and check for leakages.

(4) Break the wire seal on the tracer bottle and carefully open valve G while looking for possible leakage at the ends of the bottle. If leakage occurs, close valve G immediately and then close all other valves.

(5) If there are no leaks, open valve H and the tracer solution will be pressed into the injection pipe.

(6) Check by means of the gamma monitoring equipment that the tracer is transferred to the water injection line.

(7) After 30 min a sample should be collected from the injection water that has been diverted through the tracer bottle. The sample should be checked for tracer by means of the portable liquid scintillation counter.

(8) If the samples show that the tracer concentration in the water which has passed through the injection module is sufficiently low, the injection can be stopped and all valves closed. However, the injection should last for at least one hour before it is terminated.

(9) Disconnect the injection module and check for radioactivity at the outlet/inlet opening on the injection line.

(10) The injection module can now be decontaminated and prepared for another injection.

III.1.6. Decontamination

Personnel from the tracer group will clean all equipment and, if necessary, all areas that have been contaminated by radioactive material. Sweep tests will be performed in order to ensure successful decontamination. Equipment that cannot be decontaminated at the platform will be packed according to the rules and sent to the institute for further cleaning or storage.

The radioactive and non-radioactive tracer injections that are described in this report will not have environmental consequences.

When transport, storage and handling of the tracers are carried out according to laws, rules and regulations, the tracer injections can be performed in a safe manner. Under normal circumstances there will be practically no radiation exposure to the operators or to the general public.