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SK4 3.1 Thc verification of the comct positioninr of ulenum deluge svstem valves in thz
Buildinlz 991 Deluae Svsteni arid in the Building 985 Plcrluni Delu~re Svsteni if
the corresuondina ventilation svstern is intended to be used assures. in part. the
OPERABILITY of the Automatic Plenum Delune Systems. The SR to verifv
valve positioning on a monthfs intend satisfies several of the rcquirements found
in NFPA 25. If SR 4.3. I is not met. entw into LCO CONDITION -4 or LCO
CONDITION B is exizcted. depending on which system is deficient.
SR 4.3.2 The perfomtance of an overheat detector and automatic deluge value test of the
Building 991 Deluge Svsem and of the BuiIdina 985 Plenuni Deluge Srstem if
the corresuondinp ventilation system is intended to bi: used assures. in part. the
OPERABILITY of the Autotnatic Pfenutn Deluoe Svstcins. ’The SR to test the
svstems miiallv sarisftes, in nart, requirements found in NFPA 25 and NFPA 73.
If SR 4.3.2 is not met, entm into LCO CONDITION A or IC0 CONDITION E? is
emcted. devendinrr on which systcm is deficient.
Revision 1
Scntmhcr- 1999
As stated in the BASES of LCU 3.3. the Automatic Plenum Deiuae Svstenis are
DEFEKSE-IX-DEPTH svstems and are not credited controls in the safets
aridvsis. Arnuments have been made that the size fire needed to yield exhaust
ventilation svstem air temwratures in excess of 1YPF (the heat detector setpoint
for the actuation of the automatic Dortion of the deluge systems) is not considered
to be credible. Howevcr. the system is to be maintained in its current
configuration (i.e.. not &owed to dc&e any M e r than its cumnth realized)
as added assurance for protection of the HEPA filters against die imDacts of laroer
fires than those maivzed in the safetc. mdvsis. Full comuliance with NFPA
requiremena is not emected or necessm because of the low likelihood of svstem
actuation and need.
The testabilitv of the hat detectors of the Buildino 991 Automatic Plenum Deluge
Svstem has demded since initial installation. The three denurn intrike dum each
have three heat detectors equally swzced around the dud. The testing ‘wpmtus
for some of the nineheat detectors (at writinp. five of the nine) is no longer
available due to cable exposures to the elements over the years. At least one heat
detector in each intake duct is testable. The adeauacv of this confimTion for a
credited s d d ~
svstem would be questionable since a single heat detector in thc
intake duct niav not be able to detect dil situations of hiah intake duct air
remmmtures (i.e.. the heated air mal‘ ‘%ue” a wail of the duct rather than mix
\iddine: lower air temperature nadinrrs bv a heat detector outside ofthe heated ax
stream). A credited safe& svstem would =quire full testing of the svstern.
inrludinn all heat detectors in the svsteni.
A-74 Building 991 Complex FSAR
Appendix A