Disassembly Basins

HOWELL, IP, Corrosion of aluminum alloys in a reactor disassembly basin , Corrosion/93, Natl Assoc, of Corrosion Engineers, Houston, TX (1993) paper 609. 

The BIO examines the hazards assodated with K-Reactor in the Cold Standby condition described in the K-Reactor Cold Standby Plan (reference 2). Tlie BIO also examines the D-Reactor and P-Reactor Disassembly Basins to ensure that die storage and handling of irradiated components in those basins and hazardous mat als in their Disassembly Areas are bounded by the analyses performed for the K-Reactor Disassembly Basin. 

The operations of the K-Reactor Purification Area and the K-, L-, and P-Reactor Disassembly Basins have been examined in this BIO to ensure the adequacy of tiie safety envelope, and to develop and promulgate any new requirements ensuing from the Preliminary Hazards Analyses and the Hazards Assessment Documents. The existing K-, L-, and P-Reactor Technical Spedfications were also reviewed. The review revealed the need for new admimstrative controls to preserve the safi ty anatytis assumptions. 

K-Reactor in Cold Standby will continue to store and handle uninradiated fitd and irradiated components and store and process contaminated moderator in the same maimer as previoudy used except for the larger quantity of unirradiated fiiel and contanunated moderator and in some cases contaminated moderator stored in new locations. The L- and P-Reactor Disassembly Basins... 

At the Savannah River Site (SRS), K-Reactor b in Cold Standby lit which a startup capability is maintained, but no planned provision for restart Cold Standby operations be the continued stor and handling of unirradbted foel and hia ed components and the storage and processlng of contaminated modnator. Also, the L> and P-Reactor Disassembly. Basins will continue to store and handle irradiated conqioiMots. 

The puipose of this Basis for Interim Operadon (BIO) is to establish an interim safety basis for K-Reactor in Cold Standby and to bound the operations of the L- and P-Reactor Disassembly Basins. This BIO demonstrates safety to ty workers throu adherence to saf management programs. In addition to adho ce to sa management program ti BIO demonstrates safety to co-located workers and the public by identitication of the safety envelope and presentation of the results of qualitative and senii-quantitmive safety analyses (Ref 1 1). The BIO serves as the basis fbr the continued use ofK-Reactor in Cold Standby ti>r tiie puipose of tiie... 

The mission of the L- and P-Reactor Disassembly Basins will continue to be the storage and handling of irradiated components prior to shipment to the Separations fiidlities or to the burial grounds. 

The documents that constitute the authorization basis are those documents upon which DOE bases its condusion that the activities of K-Reactor in Cold Standby and of the L- and PrReactor Disassembly Basins will be conducted safely and without undue risk to the cility workers, co> located workers, public, and enwionment... 

Because the location and operations perfonned at K-Reactor in Cold Standby and L- and P> Reactor Disassembly Basins vdll lemain the same as previously petfonned during routine reactor operations, the cuirent site and reactor order compliance statfis is applicable to the continued use of K-Reactor to store and handle unirradiated fUd and irradiated compcments and to store and process contaminated moderator and the continued use of L- and P-Reactor Disassembly Basins to store and handle inadiated components. 

The op compliance sdiedule approvals (CSAs) and DOB Order noncompliances fi)r K-Reactor and L- and P-Reactor Disassembly Basins involve 29 Orders. Of these, 17 were found to be relevant to K-Reactor in Cold Stamlby most were programmatic in nature. There were 13 open CSAs and 4 exemption requests found to be relevant to the L- and P-Reactor Disassembly Basins. 

The K-Reactor Disassembly Basin currently stores 901 inadiated fiiel assemblies (Ref 2-7). Though a majority of the assemblies were irradiated in K-Reactor, some were irradiated in P- and L-Reactors and placed in the K-Reactor Disassembty Basin for storage. The basin contains 900 Mark 22 and 1 Mark 16B assend>lies. The K-Reactor Disassembly Basin also contains S49 irradiated targets, neutron sources, and other reactor components (Ref 2-8). 

The L-Reactor Disassembly Basin currently stores 516 Miark 16B irradiated fitd assemblies and 7320 irradiated targets, neutron sources, and other reactor components (Ref 2-8). 

Though K-Reactor is m Cold Standby and the L- and P-Reactor Disassembly Basins are in Cold Shutdown/Standby, chenucals will continue to be used in these Bv comparison of the emsting inventories of chemicals and the allowable quantities of chemicals agamst hazardous chemical screening criteria, the only hazardous chemicals of concern which were Identified are nitric acid for the K-, L-, and P-Reactor Disassembty Areas and sodium hydroxide in solid form for the P-Reactor Disass nbly Area. 

The contents of the Disassembly Basins for the Is 1 P Reactors will continually be changed based on misdon and needs of the Reactors Diwdon and are assumed to be correct as of the dated reference from which the contents are taken. 

Provide operation of the K-Reactor Disassembly Basin until the fissile and hazardous materials have been removed... 

The following equipment will remain functional for the K-Reactor Disassembly Basin ... 

The Reactor Division Disassembfy Ba Managemem Plan (Ref. 2-13) addresses the vulnerabilities associated vnth fiiel and target material in the K-, L-, and P-Reactor Disassembly Basins. This plan provides fisr resolution of issues that were raised by Secretary O Leary s vulnerability assessment of DOE reactor irradiated material sto e fidlhies (Ref 2-1%. Immediate, int mediate, and long-term plans and assumptions are inchided (Ref 2-13). 

When the assemblies are discharged from the Reactor Tank, they are moved to the D E canal m the Process Room, placed in the D E conveyor, and transferred to the Disassembly Basin side of the D E canals The D E canal is a water ed canal located under die diieldtng wall that separates the Disassembly Area from the Process Room. In the IKsassembly Basin, the assemblies are transferred to hangers suspended from overhead monoids diat are used to store and transport the irradiated asseihblies throughout the Disassembfy Area 2>4, Section 9.1.2). The assemblies are initial stored in the VTS basin for a specified period of time to allow for decay of radioactive isotopes. This time varies with the types of material, since each material yvitt decay at a different rate. 

The Disassembly Badn filtration system maintains the Disassembly Basin water visual clarity vdthin specifications for routine underwater woric performed by component handling personnel. The tystem removes particulate and suspended solids in the basin water through use of sand tilters. 

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