K-Reactor Moderator Storage Areas

Moderator Storage Areas. The contaminated moderator will continue to be stored in the storage tanks and stainless eel drums however, in some cases the moderator will be stored in new locations. The contaminated moderator will continue to be processed in the same manner as before. The next phase of moderator consolidation will move the moderator present stored in the C-, L-, and P-Reactor storage tanks to the K-Reactor Moderator Storage. Areas. Miscellweous irradiated and uniiradiated components (e.g., bCron carbide safety rods, instrument rods, spaijets, and other stainless steel and aluminum reactor components) may continue to be stor in the Process Room the Reactor Tank), thou none of the reactor ... 

Radiological hazards of cons uence have been identified in the following K-Reactor areas Moderator Storage Areas, Assembly Area, Disassembly Area, and Purification Area. The hazards associated with the K-Reactor Moderator Storage Areas and Assembly Area have previously been evaluated in their BIOs f 2-2. 2-3). The following is a summary of the radiological hazards identified in the BIOs for the Moderator Storage Areas and Assembfy Area ... 

The steam astern is required for the moderator recovery and rework in the Purification Area (apprommatefy three years) ahd freeze protection due to moderator bang stored in K>Reactor Moderator Storage Areas e 2-2). 

The fissile materials to be stored in the K-Reactor Moderator Storage Areas are contained in the form of trace amounts of phitonhim in the dnims and tanks of moderator. Criticality is not possible in the K-Reactor Moderator Storage Areas because the trace amount of plutonium is well below the theoretical minimum critical mass (Ref 6-16). 

The total consequences of the very conservative maximum postulated release of 4650 drums worth of contaminated moderator by a ground release from the K>Reactor Moderator Storage Areas was calculated to be (Re 8-S8) ... 

Using the Reforence 8 58 results for the K Reactor Moderator Storage Area% the consequences for the rdease of contaminated moderator from the Purification Area during a DBE can be derived as follows ... 

Dnims and tanks in the K-Reactor Moderator Storage Areas could burst during freezing temperatures to produce a contaminated moderator release should the heating systems of Building lOS K be out of service of an extend period of time. The consequence to the maximally exposed ofi te individual would not exceed iOO mrem since only a small fraction of the drums and tanks are expected to be affected if at all. However, in order to prevent a release of tritiated moderator to the enviroiunent, freeze protection and builtfing temperature verification procedures should be strictly followed (Ref 9-7). 

Basis for Interim Operation IBIOI for the K-Reactor Moderator Storage Areas Of). 

Basis for faterim Operation (BI01 for the K-Reactor Moderator Storage Areas (LH. WSRC-TR-93-611, Rev. 1, Westinghouse Savannah River Company, Aiken, SC, May 1994. 

---