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Transfer of waste liquid to Building 374
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Guidelines For Preparing Criticality Safety Evaluations at Department of Energy Non-Reactor Nuclear Facilities
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Design Features and Administratively Controlled Limits and Requirements - s3007cn10121


DOE-STD-3007-93
effluent liquids from the CWTS have undergone precipitation to remove Plutonium, and supernate
liquids from glovebox 18 have been filtered through an R6 filter and three l-micron bag filters,
rigorous controls have been instituted to preclude any likely contingency in the CWTS which
could cause concentrations exceeding the waste transfer limit to be inadvertently sent to tanks D-
811 A/B. Note that caustic liquids are only filtered since particles are suspended and not
dissolved. Valve MV-24425 is closed and locked out, and valves MV-24401 and MV-24527 are
verified as closed when solution is pumped into clarifier columns T-2411 A/B to preclude bypass
of the precipitation process in glovebox 18. Note that residual liquid between closed valves
would not pose a criticality safety issue as it would be of small volume. Also note that
correspondence from T.E. Boyd to L. Martella, "Precipitation of Plutonium with Magnesium
Hydroxide: TES 008.97", October 10, 1997, shows that supernate liquid from precipitation of 25
g/l fissionable liquids would be less than 7 g Pu/l. Reference Appendix O.
6.8.2 Supernate liquid from clarifier columns T2411 C/D are pumped through either of the banks
of three 1 -micron bag filters FL2416-1, 2, 3 (A/B) into either of tanks D-2402 A/B. It would be
unlikely for this liquid to be in excess of 7 g/l Pu since it would require a combination of upset
conditions, including failure to precipitate, failure to use the R6, and/or failure to use the one or
more of the l -micron bag filters. This forms the first contingency.
6.8.3 Waste liquid in tank D-2402 A or B is mixed via vacuum sparge and sampled by the
Building 371 operating group prior to transfer to tank D-2403. If lab results show the liquid to be
less than the waste transfer limit, valve AOV-213, which is normally locked out in the closed
position, is opened and the tank contents transferred to tank D-2403. Liquid above the waste
transfer limit is recycled back to tanks D-2401 A/B/C/D and reprocessed in the CWTS. Waste
liquid in tank D-2403 is then mixed via vacuum sparge and sampled twice by the Liquid Waste
Treatment organization from Building 374, with additional mixing between samples. If both of
these samples are less than the waste transfer limit, valves AOV-201, AOV-206, and MV-0884,
all normally locked in the closed position, are opened and the waste liquid is pumped to tanks D-
811 A/B in Building 374. In addition, tank D-2403 is limited to a maximum of 200 grams total
fissionable material (39% of the minimum critical mass of Pu-239) and assayed on a bi-monthly
basis as additional barriers. Since two independent organization have multiple opportunities to
verify waste liquid concentration, numerous independent samples would have to be misanalyzed,
and several normally locked closed valves would have to fail or be left open, it is judged that
failure to transfer only waste liquids below the waste transfer limit from tank D-2403 to tanks D-
811 A/B is unlikely. This forms the second contingency.
6.9 Direct draining of Building 371 tanks to tanks D-2401 A/B/C/D:
One method of draining Building 371 tanks involves the installation of a tap in the outlet of a
tank, which is then directly connected to tanks D-2401 A/B/C/D via nominal " tygon tubing into
the manifold in GB-2401. The contents of the target tank are then drained into the CWTS using
gravity assisted by the vacuum (PROVE Vacuum System) on tanks D-2401 A/B/C/D. This
activity can be conducted with Building 371 General Comments and Miscellaneous
NMSL/CSOLs. Since Building 371 tanks were pumped systems and no fissionable solution was
introduced into the vacuum system by overfilling tanks, no specific criticality controls are
5-17


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