Breathing Air - h3010v20163

DOE-HDBK-3010-94

Appendix B; Plutonium Recovery Facility

two surge receivers. Downstream of the receivers, reducing valves are used to provide an

80-psig plant air line and a 65-psig instrument air line. Low-pressure alarms are provided on

each line.

The process air line provides air to the process itself. Examples of its use include mixing air

jets, purges and sparges, automatic samplers, and air to the calcining unit for oxidation.

Purge flows and calcining and hydrofluorination air come off of a reduced pressure 30-psig

branch. Calcining and hydrofluorination air go through another drying tower to produce air

with a dewpoint of -40 F. In all cases, restriction orifices minimize potential flow inside

the glovebox in the event of a line failure.

The instrument air line provides air at 65 psig for all pneumatic instruments and valves.

Restriction orifices are used in this system as well to minimize interior glovebox flows in the

event of a line failure.

2.1.5.12 B reath in g A ir

As in the case of process and instrument air, filtered breathing air is drawn into one of two

redundant compressors and discharged to receiving tanks. Maximum flowrates and pressures

are 450 scfm and 115 psig. A low-pressure alarm is provided on the receiving tank, which

allows 5 minutes of breathing air for eight people to exit from any ongoing jobs.

Downstream of the receiving tanks, supplied breathing air passes through two stages of

cellulose fiber filters that remove particles greater than 20 m in diameter. Reducing valves

maintain a pressure of 30 psig on the system, which serves sets of manifolds in all of the

operating and maintenance areas. A monitoring system is provided inline with the main

header, which measures temperature, pressure, and O2, CO2, and H2O concentration levels.

An alarm is provided when one of these parameters goes out of a specified band. All alarms

on the system are received in the control room and at individual manifold stations.

2.1.5.13 S team an d C on d en s ate S ystem

Steam is received from the site boilerhouse via a 150-psig main. Before entry into the

building, it is reduced in pressure to 60 psig. Steam branch lines for use in the facility are

reduced to a nominal pressure of 35 psig.

General building use steam condensate is collected in tanks in the utility area and pumped

back to the boilerhouse. Boilerhouse steam also serves as the heat source for the reboiler

tank in the utility room. Condensate from the reboiler is collected separately from the

general building use condensate and sampled prior to transfer back to the boilerhouse. If

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