ily switchable (within 2 hours) to process projectile bodies should the need arise. Testing of the MPTs has shown startup from a cold condition to take 4-6 hours. There is an 8 tray buffer between the MWS and MPT. One MPT can process 8 trays in 8 hours. Negating the GB case because of the fact that there are very few munitions to process compared to rockets, the MPT can process rounds at a faster rate than that scheduled for the NCR-MWS or the LPMD (39 vs 21 projos/hr for VX, and 40 vs 26 projos/hr for H). For VX, it takes the MPT 8 hours to process a full buffer that the NCR-MWS took 15 hours to produce; and for H it takes 8 hours to process what took the LPMD 12 hours. Therefore, even if the second MPT were cold when the first failed, because the buffer size is larger than the heat up time and because the MPT can catch up on a backlog, the NCR-MWS or LPMD could continue operating normally and there would be no net effect change in the processing schedule (BPBG, 2006c, p. B-5).

Average throughput rates are even lower than stated above (see Table 4-5).

The required processing rates are so low that extended processing times due to lower ramp-up rates will have no effect on overall plant munitions throughput. Thus, MPT

TABLE 4-5 Metal Parts Treater/Metal Parts Treater Cooling System Projectile Throughput Rates

System

Munition Type

Installed Operating Rate (rounds/hr)

Average Throughput Rate(rounds/hr)

MPT/MCSa

8-in. M426 (GB)

15

7.5

MPT/MCS

155-mm M110 (H)

40

9.9

MPT/MCS

155-mm M121A1 (VX)

39

8.8

aMCS, metal parts treater cooling system.

SOURCE: BPBG, 2007.

production rates are not a critical factor in plant production. However, it is possible that lower-than-anticipated ramp-up rates could affect plant closure operations.


Finding. Based on the four factors specified above in this section (Ability to Scale Up and Meet Throughput Requirements), the full-scale MPT is expected to meet design throughput rates, and, even if it falls somewhat short of design values, overall plant throughput is not expected to be affected.



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