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DMJM H&N I AECOM
Calculation No 145579-D-CA-056
Rev.
RPP-24544 REV Id
Project Number: 145579
Page 3 of 12
ORIGINATOR: John Irwin'1% 03-25-2006
Calculation Title: DBVS OGTS Bypass System CHECKER: y ack McConwell
Thermal Hydraulics Analysis
3--eC vC
1.0 INTRODUCTION
The Demonstration Bulk Vitrification System (DBVS) will be used to demonstrate the
bulk verification process on low activity tank waste. Waste is retrieved by a Single-Shell
Tank Waste Retrieval System and then delivered in batches to the DBVS Waste Staging
Tanks. The liquid waste is dried and then transferred into a process system including an
in container vitrification station (ICV box). The ICV box is ventilated by an Off Gas
Treatment system (OGTS). The OGTS has an emergency backup exhaust system, the
OGTS Bypass system, which is connected to the ICV box through a piping connection on
the main OGTS ductwork. The OGTS bypass system consists of HEPA filters, fans, air
bypass filters, valves, heaters and piping. When required following a loss of normal flow
to the ICV Box, the OGTS bypass system is automatically valved in, to provide a
negative pressure at the ICV box and transfers the process gas to a HEPA filter and
• finally into the main OGTS exhaust stack.
1.1 Purpose
1.2 Scope
2.0 Basis
This calculation provides a thennal hydraulic assessment of the OGTS Bypass System.
The OGTS bypass system air flow rates, system pressure losses and temperatures are
determined during its expected normal operating conditions.
The scope of the calculation is limited to the determination of the system flow rates,
pressure losses and temperature in the piping and components from the ICV box to the
OGTS exhaust stack. This analysis will determine the fan/system operating point; assess
the operating pressure in the ICV box (insuring a negative pressure is maintained in the
ICV Box) and predict the temperature of the piping from the ICV box to the OGTS
exhaust stack for normal flow conditions as specified in Section 2.1.
2.1 Design Inputs
1. Component and pipe lengths are derived from the project drawings listed in the
reference section and contained in Attachment I of this report. The Bypass
• system ducting is schedule I OS (8 inch and larger) and schedule 40S (6 inch and
smaller), stainless steel pipe, A312 type 316L with surface roughness as specified
in Crane 1988.
1-'om EP 3.3-21'. April 2005
A5-465