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SURVEILLANCE REOUIREISfEXTS BASES
SR421 fie mnibination of a working shift and activitt coinoletion sun.cilIancc 15
(continued) suficient rather dim a continuous sunreillance due to the twe of actnitiq:
conducted in the BUILDKG 991 COMPLEX Since the nomial opr'rahons of the
faciliW do not deal with exoosed radioactive rnaterhls (LE . mdioamve niatenals
are in nietal containen.). iiltered exhaust is not ~iecessan. for coritarniriacion
control. The Filtered Exhaust Ventilation Svstem provides mitigatioti for
pomlatcd accidents. The combination of the reliabiiitv of the svstem, the lack of
contamination in the hili@. the likelihood of accidents resulting in radioacme
material releases during, a working shift and the vefification of configuntiot:
restoration following receivinrr and shipping activities ii~stifv the acceptabilih of a
working shift vcrsus a continlious surveillance. If SR 4 2 3 is not met. enm into
LCO COYDITION E is exuected.
SR 4.2.5 The verification that the uressure differential across the Buildino 991 ventilruioii
svstem exhaust plenum is below a mcified limit assures, in uart. the
OPERABILITY of the Filtered Exhaust Vcntiladon System. The SR to venfL
p~enuin differential ~ressure each workina shift Drovides an indicafon that the
plenum single stage of HEPA filtration is unblocked. "lie working shift
sunveillance is sufficient. rather than a continuous surveillance due to likelihood of
events occurring &ax would yield blocked filters. Events of the me necessary to
Geld conditions that would fil the SR are si~ficant events in the faciliti and
their impact on the stage of HEPA fif.tration is likelv to be investigated follo\\inq
the event occurrence. If SR 4.2.5 is not met. entrv into LCO COKDTTIOU F IC
expected.
Revision L
September 1'999
A-6 1 Building 99 1 Complex FSAR ,
Appendix A 1