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Building 991 Complex FSAR/NSTR Change Summary
September 15,1999
I Revisions
Building 991 ComDler FSAR Revision 1
Y
Executive
summary
Chapter 1
Chapter 2
Chapter 3
Chapter 4
Chapter 5
~
Chapter 6
Updated to reflect changes made in document.
Nochangesmade.
Attachment 4
MW-119-99
Septcmbcr IS, 1999
Page 1 of 3
Added information concerning current configuration of B99 1 roof plenum deluge system.
Identified testing capability of system.
Provided discussion on configuration of B985 and B991 HEPA filters (when they were
installed, replaced, and last wetted).
Updated Figure 2-14 to show 2"d valve (located on B991 roof) that is used to activate the
manual deluge system for the plenum.
Nochangesmade.
Revised IW radiological dose consequences for accident scenarios. We inc~rporated the
approach the recently approved B776M77 BIO used. This approach caused some of OUT
previous IW dose consequence evaluations to change.
Updated discussion to indicate that puncture of POCs and Type B containers is not
considered a credible accident scenario.
Added summary for new accident scenario on heavy snow event-induced spill.
Updated Table 4-5 based on changes to NSTR accident scenarios.
Updated Risk Dominant Accident Scenario discussion. Used this section to formally credit
the building's filtered exhaust ventilation system. By creditbgthefiltered exhaust
ventilation system and using the B776/777 BIO IW dose conx?quence approach, the number
of risk dominant accident scenarios was reduced from 5 to 3.
Updated Table 4-8 to idenhfy all scenarios for the assumptiodfeatuxdrequkement. Added
requirements to this table.
Re-wrote to separate the discussion of system category (SC) SSCs and safety-
clasdsignificant SSCs since the Site methodology does not currentIy correlate with the
DOE-STD-3009 methodology.
Added information crediting the automatic fire suppression system, flow alarms and smoke
detectors based on their capability to mitigate potential fires larger than those evaluated in
the NSTR
Updated to incorporate changes made to FSAR and NSTR Updated Tables 6-1 and 6-2 to
make consistent with FSAR and NSTR.