ML18025B661
| ML18025B661 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 09/17/1981 |
| From: | TENNESSEE VALLEY AUTHORITY |
| To: | |
| Shared Package | |
| ML18025B660 | List: |
| References | |
| NUDOCS 8109290639 | |
| Download: ML18025B661 (6) | |
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SURVE
~ L,L!.IiC" v*.....';-!1aS 3
9 AUXlLIARY'L"CTRIC! L SYS '
H
>I.9 AUXILIARY"LECTRICAL SYSTEM tower transformers, and the bua t'o board energized a..d capable of upply po-er to the units 1
and 2
hutdown boards, provided t'ha" the second ourco ia fron the 50Q.-.kV system.
fo'owin
- 1. Doenorgization of the emergency busea and load shedding from the emergency huaca.
- Both 161-kV lin a, one common ata"on serv'ce transformer supply-ing a start bus, and one cooling tower transformer (through the bus tie board) provided the cooling tower transformer is not parallel t the common station service trans-former and provided that the second
'source is from the 500kV system.
A reactor shall not be started up (nado critical) from the Hot Standby Condit'on unlesa all of the fol'owirg conditions are satisfied:
l.
One of tho off-site power sources 1'ated above is a;ailable and capab'e of supp 1 ving au.ril iary power to the shutdown boards.
- 2. Throe units 1 and 2 diesel goner ators shall bo operable.
3.
An add'ional source of power conai"ting of ono of tho following:
a.
A second off-site power source availablo and capab' of supp lying power to tho shutdown boards.
- 2. The dioaol starts from
. mbiont cordition on the auto-start signal, oner gizoa the onergorcy buses with permanently connected
- loads,
'energizes th auto-connected emergency loads through the load aequencer, and oporatoa'or g.eater than or equal to five minutes while its generator
'a loaded with the energoncy loads.
3.
Qn diesel generator br aker trip, the loads are shed from the emergency buses and the d'
el ros tar ts on th auto-start
- signal,
'ho emcrgcncy buae-are energized with permanently connected lo ds,.the auto-connected emergency loads are energized through the load aoqucncor, and the diesel oporatoa for greater than or equal to five minutes while its gener tor is loaded with tho emergency loads.
b.
A fourth operable units 1
and 2 diesel generator.
Busoa ard Boards Available.
a
~
(deleted) c, Once a month the quantity of diesel fuel available "hall be logged.
- d. iach diesel generator shall be given an annual inspection in accordance 293
SURV-ELLA!1C'-"
UXR" Y. HTS 3.9 f'UXILZARY =LECTR:CAL SYST=~l II,9 AUXILXARYEL"-CTRiCAL SYST;"..l B.
Cneratinn with "nooerable Eo.'ament B. Cccration with lno erabl c EcJUUl'>.".IQ.'It
'ri'hencver a: eactor 's 'n Startup mode or Run mode and rot in a cold con'dition, the availabil'y of cl ctric power shall be as spec'fi d in 3.9.A except as specif'cd herc. in.
From and after the date th t only one off-site power scurce is available, reactor op ration 's pernis"'ble for seven days.
2.
'l'hcn only one offsitc power source is operable, all units 1 and 2 diesel generators and associate" boards must be de..:onstrated to be oper ble iwedia e'y and daily ther caftcr.
H.A.
2, From and after the date that thc fl-kV bu" ie board becomes inoperable, reactor o~craticn 's pe-missible indefinite'y provided one of the required off-site power source is not suppl'ed from the 161-kV system through thc bu" tic beard.
3.
A'hen one'cf the units 1 and 2
d'esel generator is inoperable, contiru d reactor operation 's permissible the succeed'ng 7 davs) provided that two offsitc power sources are available, and all of the CS, R<lR (LFCZ ard Containrcn Cooling)
- Systems, and the rc:,".aining three uni:s 1
and 2 diesel generators a"e operable.
lf th's r cquire.-..ent cannot be m t, an ord rly shutdown "ha'1 be init'ated "nd thc reactor shali be shut down and in the co'd cordition w'hin 2ll hours.
5
~
Vhcn onc of thc un'ts 1 and 2
diesel generator is fo rd to be <<nopcrable, all of the CS, RHR (LPCZ and Conta nment Cool'ng) systems and the remainin; diesel ge..era tors and associated boards shall be demonstrated to be operable ir~ediately and daily thereafter.
>!hen one 0-kV shu down board is found to be inoperable, all remaining fl-kV shu"down boards and associated diesel gene.atcrs, CS, and'HR (LPCl and Containment Cooling)
Systems supplied by the rema'ning ll-kV shutdown boards shall be demonstrated to be
- operable, immediately and dai'y thereafter.
<Ihen onc hutdo'~m bu" is found to be inoperable al 1 and 2
diesel generators shall be proven operable ir~edia ely and daily thereafter.
Mhen one units 1
nd 2 fl-kV shutdown board is inoperable, continued reactor operation is permissib'e f'r a period not, to exceed 5 day',
6.
Nhen one units 1 and 2 Diesel Aux. board is found to be inoperable, the remaining diesel Aux. board and each unit 1 and 2 diesel generator 295
ENCLOSURE 2 JUSTIFICATION FOR PROPOSED CFA!AGES TO TECH"JICAL SPFCIFICATIOtJS BRO'vJHS FERRY tJUCLEAR PLAtJT UNITS 1
AND 2 TVA BFNP TS 166
JUSTIFICATION TS 3.o.A.4.a should be deleted because start bus operability is rot rexated to using the 500-kV system or the 161-kV system through the cooling 'tower transformers as an offsite power source.
By revising TS 3.c.A star t bus operabiity i.s associated with the common station transformers as it shouLd be.
Revising TS 4.9.B.1 to state "Mhen only one offsite power source Xs operable,
.." clarifies this technical specification.
- Thus, no safety margin is reduced bv this technical specification chancre.