ML20035C991

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Marked-up TS 3.3.5.1-1 Re ECCS Instrumentation
ML20035C991
Person / Time
Site: 05200001
Issue date: 04/07/1993
From:
GENERAL ELECTRIC CO.
To:
Shared Package
ML20035C989 List:
References
NUDOCS 9304120016
Download: ML20035C991 (8)
v • d • e


Text

. __

l ECCS Instrumentation 3.3.5.1 Table 3.3.5.1-1 (page 3 of 5)

Emergency Core Cooling System Instrumentation APPLICABLE CONDITIONS MODES OR REFERENCED OTHER REQUIRED FROM SPECIFIED CHANNELS PER REQUIRED SURVEILLANCE ALLOWABLE FUNCTION CONDIT10k$

FUNCTION ACTION AD.1 REQUIREMENTS VALUE 3.

High Pressure Core Flooder-& prey (HPC&f)

Subsyste= 5 /c t--

a.

Reactor Vessel 1,2,3,

[4)(b) 6-EA SR 3.3.5.1.1 2 [4LS) Esi Water Level -4ew SR 3.3.5.1.2 4ashee t

Eisl tel 45R 3.3.5.1.31 kwr Level 31.5 7

SR 3.3.5.1.54 SR 3.3.5.1.65 5"

3.? 5 * '

b.

Drywell 1,2,3

[4)(b)

S-NA SR 3.3.5.1.1 5 [4,44)

Pressur e - H i gh SR 3.3.5.1.2 Kg/cs'-ps4g 45R 3.3.5.1.31 SR 3.3.5.1.54 SR 3.3.5.1.65 2.3.5 *.'

c.

Reactor Vessel 1,2,3,

[3.-4) c-EA SR 3.3.5.1.1 5 [55,J)ieni Water SR 3.3.5.1.2 4asAes Level - High, E181 5581 45R 3.3.5.1.31 Level 8 SR 3.3.5.1.54 s

59

?.2.5 ' S d.

Condensate 1,2,3,

[3-4)

D4 SR 3.3.5.1.1 t [4] cm4w.hes Storage Tank

~

SR 3.3.5.1.2 L evel - L ow E1Cl~'iM 45R 3.3.5.1.31 SR 3.3.5.1.54 E ".

3.?.5.'.6' e.

Suppression Pool 1,2,3

[34)

D4 SR 3.3.5.1.1 5[M] Em-insaes Water Level - Hign SR 3.3.5.1.2 44 3.3.5.1.31 SR 3.3.5.1.54

" ?.3.5 '.f 3

f.

[HPC&F Ptsnp 1,2,3,

[1]

E

?.3.5.*.1 2 [ 3-p649 Kp/cm' Discharge SR 3.3.5.1.2 Pressure - High Eial Stal 45R 3.3.5.1.31 4&ype w)]

SR 3.3.5.1.54 EP I.3.5

'.6 g.

[HPC&F System 1,2,3, 11)

E E?

2.3.5.'

r
-S:

' ;p 41'1 181 45R 3.3.5.1.31 3

4&ype w ))

SR 3.3.5.1.54 E9 3.3.5

'.6

h. 'HPCf Pmp Suction 1,2,3 (1)

E SRl'3.3.5.i.2 eJI i tg/en/ -

Presrure - Low sri 3.3.5.1.3 SR 3.3.5.1.4 ih. Manual laitiation 1,2,3,

[1]

C4 SR 3.3.5.1.64 NA E{al 5{al (continued)

(a) When associated subsystem (s) are required to be OPERABLE.

(b) Also required to initiate the associated [TS required functions]

(c) When HPCS is required to be OPERABLE by LCD 3.5.2, ECCS - Shutdown, and condensate storage tank water level is not within the limits of SR 3.5.2.1.

4 k.A/4-ABWR STS 3.3-54 04/02/93 & 0,ennER2 1

9304120016 930407 PDH ADOCK 05200001 PDR

ECCS Instrumentation B 3.3.5.1 BASES ( APPLICABLE SAFETY ANALYSIS, LCO, and APPLICABILITY Continued )

3.e.

Suporession Pool Water Level-Hioh Excessively high suppression pool water could res ' alt in the loads on the suppression pool exceeding design values should there be a blowdown of the reactor vessel pressur e through the S/RVs. Therefore, signals indicating high suppression pool water level are used to transfer the caction source of HPC6F from the CST to the suppression pool to eliminate the possibility of HPC6F continuing to provide additional water from a source outside containment. To prevent losing suction to the pump, the suction valves are interlocked so that the suppression pool suction valve must be open before i

the CST suction valve automatically closes.

This Function is implicitly assumed in the accident and transient analyses (which take credit for HPC6F) since the analyses assume that the HPC6F suction source is the suppressica pool.

Suppression Pool Water Level-High signals are initiated from bwe four level transmitters. -The icgic i: arranged i

euch that either transmitter signel: :nd :::ceint ed trip unit can ?. high1 suppression pool 11evel signalifromfa'ny'two of-the four transmitters'willicau'se~the suppression' pool suction' valve to'open and'the CST suction valve to close.

The Allowable Value for the Suppression Pool Water Level-High Function is chosen to ensure that HPC6F will be i

aligned for suction from the suppression pool before the i

water level reaches the point at which suppression pool design loads would be exceeded.

Two signals'(twoJout-of-four)ichannel: Of from the 7

Supp'ression' Pool Wate'r Level-High Function a're only

~

required to be OPERABLE in HODES 1, 2, and 3 when HPC6F is 4

required to be OPERABLE to ensure that no single instrument failure can preclude HPC6F swap to suppression pool source.

In HODES 4 and 5, the Function is not required to be OPERABLE since the reactor is depressurized and vessel blowdown, which could cause the design values of the containment to be exceeded, cannot occur.

Refer to LCO 3.5.1 for HPC6F Applicability Bases.

f r

3.f.3.o.

HPCF-HPG6 Pump Discharoe Pressure-Hioh !Evacast a nd HPCF-HPG6 System Flow Rat e -Low (Dynne&&

l The minimum flow instruments are provided to protect the HPC6F pump from overheating when the pump is operating and i

the associated injection valve is not fully open.

The minimum flow line valve is opened when low flow and high pump discharge pressure are sensed, and the valve is l

automatically closed when the flow rate is adequate to protect the pump or the discharge pressure is low j

(indicating the HPC6F pump is not operating).

The HPC6F System Flow Rate -Low and HPCEF Pump Discharge Pressure - High Functions are assumed to be OPERABLE and i

capable of closing the minimum flow valve to ensure that the ECCS flow assumed during the transients and accidents analyzed in References 1, 2,

and 3 are met.

The core cooling function of the ECCS, along with the scram action of i

(continued) i BWRf6-444 B 3.3-134 Ece.

O, 09/2S/93 ABWR.STS B 3.3-134 04/02/93 l i

ECCS Instrumentation B 3.3.5.1 I

r BASES ( APPLICABLE SAFETY ANALYSIS, LCO, and APPLICABILITY Continued )

the RPS, ensures that the fuel peak cladding temperature remains below the limits of 10 CFR 50.46.

One flow transmitter and#one"pressureTtransmitter se ars

~

a

^

^

uaed to detect the HPCF-MPGG System's flow" rate and The logic is_ arranged such.that lo[w discharge pressure.

tiow concurrent with"high]pumpidischargeipressure-the teenssitter'cause's the minimum" flow valve to open, provided

~

the ".C pump dicch:rg prc :ure, ::n=:d by :ncther tr ncmitta-r, it high ncugh ' indicating the pump i:

Operating). The logic will close the minimum flow valve when the setpoints'ar one: the 10:ur : tpcint is exceeded."

(The valve will also close upon HPCF-HPGG pump discharge pressure decreasing below the setpoint.)

4 The HPCP-HPG6 System Flow Rate -Low and HPCF-HPGG Pump i

Discharge Pressure-High Allowable Value is high enough to ensure that pump flow rate is sufficient to protect the pump, yet low enough to ensure that the closure of the minimum flow valve is initiated to allow full flow into the core.

The HPCF-hPGG Pump Discharge Pressure -High Allowable value is set high enough to ensure that the valve will not i

j be open when the pump is not operating.

one channel for'_cach' HPCF system of each Fnacticr. is 1

required to be OPERABLE when the HPCF-NP66 J e required to be OPERABLE.

Refer to LCO 3.5.1 and LCO 3.5.2 for HTCP-HPGG

)

Applicability Bases.

i.

3. h' HPCF Pumo' Suet ion Pre'esu'r'e - Low The'HPCF low suction pre'asure funct'ionlis'pr'ovided to

~

protect the pump from damage ldue"toicavitation.1-IfJthe suction pressure is "less than the' pump NPSH~ requirementh the i

pump start will be inhibited.

~ '

~

l The suction pressure data originates:in'a; pressure ~

transmitter and is transmitted to the'SLus.via the EMSL The SLU logic.is arranged'so that Low suctionLpressure must exist'for a specified_amountrof_ time before pump start,will I

be inhibited to prevent spurious inhibits due:to' suction '

pressure transients. The HPCF low suction--pressure? signal'is 3

automatically reset (i.e. no manual reset needed to remove the pump start inhibit ~ when' suction pressure recovers). The HPCF Suction ' Pressure - Low Function is' assumed to' be OPERABLE and will not cause a spurious pump start inhibit I

during the transients andLaccidents analyzed in References 1,'2, and 3 are met.

The HPCF Suction Pressure-Low" Allowable Value 'are selected I

to assure that*there is sufficient NPSH for the pump and prevent spurious start inhibits due to normal fluctuations 1

in suction pressure.

one channel for each HPCF system is requir'ed to'be OPERABLE I

when the HPCF is required to to OPERABLE. ReferLtc

{

LCO 3.5.1 and LCO 3.5.2 for HPCF Applicability Bases.

i (continued)

I j

Gwaf6-GT&

B 3.3-135 ner.

O, 09/4&f43 ABWR STS B 3.3-135 04/02/93 l l

l

. _ =

= _.. _..

j ECCS Instrumentation B 3.5.5.1 BASES ( APPLICABLE SAFETY ANALYSIS, LCO, and APPLICABILITY Continued )

3~'i;-4vhv Manual Initiation l

The Manual Initiation push button channel introduces a j

signal into the HPCEF logic to provide manual initiation capability and is redundant to the automatic' protective _

instrumentation. There is one push button for the.each'of

~r the HPC6F Systems (looplBTand71oop C).

The? button [ collar' 1

must:be' rotated'peior'to. depressing;the[ push button:to' "

perform?the' manual; initiation ~

The Manual Initiatzun Function is not assumed in any l

accident or transient analysis in the ABWRISSAR-FGAR.

However, the Function is retained for overall' redundancy a.1d diversity of the HPC6F function as required by ihe NRC in l

the plant licensing basis.

l There is no Allowable Value for this Function since the i

channel is mechanically actuated based solely on the position of the push button.

One channel of the Manual 4

Initiation Function is only required to be OPERABLE when the HPCEF System is required to be OPERABLE.

Refer to LCO 3.5.1 and LC' 3.5.2 for HPC6F ApplicabilAty Bases.

Automatic Depressurization System 4.arsve.

Peactor Vessel Water Level Lcu Lea Len, - Level 1 Low RPV water level indicates that the capability to cool the fuel may be threatened.

Should RPV water level decrease too far, fuel damage could result.

Therefore, ADS receives 1

i i

i i

i d

i l

i.

l

(

i d

4 i

(continued) i BWH/4-GT6 B 3.3-136 Revv-O, 09/28/92 ABWR STS B 3.3-135.1 04/02/93 l

i 1

b ECCS Instrumentation B 3.3.5.1 i

1 BASES ( ACTIONS Continued )

2' heure (

ellcued by "cquired *.cticr C.2) 10 OMewed i

du..:..,.". ^". ". _"

_ et._ _.

n. u.m.

n__..,__a 1_...3..,.

___,m__u,_

n.___

.-rr--

.~

.m y...

- ~.......

fer Functicn:

1.0, 1.d, 2.0, end 2.d.

The "equired *cticn 40 nct Opplicable to-Fenet4en: 1.g, 2.f, nd 2.'_(which slee

__.2__

m..

,, _ a.n n..i _ _..

1 --. u. n _. ~.

.a.

.u.~____

_ _.., -... _.,. u..s.

.. ~

_.~ _,

.w...

Funet4ene-ie-ieepeceM c ), cince they Orc the "Onual Initi 44en-Fenetienc and Orc not accu =cd ir ny accident er trancient enclycic.

Thuc, a total 1000 Of manual initistion eepe~:2 2.,., _ _

e.,a t~_..__

_3.,._.._a.-

u..

n. ~_ _ 1 _ a

._1.__...n,.

u.....

s__

3.. - ~..,,.

~,

ic ellcucd.

"c qu i rc d.*.et-ica C.1 ic alcc not applicabic t Functicn 2,0 (which elec requirce entry into thic Ocndit4en 44 : channel in-t4 tic Functica ic i ncpe r:M c ), cince the 1000 cf snc ch.rnc1 recultc ir : 1eec cf the Function ituc cut cf-tuc logic).

Thic Iccc ucc considered during the development.ef-Beference t and concidcred accepteMe fer th 3

34 hourc 211 cued by "cquired.".ction C.2.

Thc Oc=plet4en-T4:e ic intcndcd-te-e44ew-t4te pcratcr time te eval

  • ate and repair any diccevered insperabiliticc. %ie Gomplet4ee-Time-eles-al4 cue f er cr enception to the nc: = 1 2t4 =c cera --fee-beglening the 11 cued cutagc t i=,.c

" clock."

m

n. y..._ _a. _ _ _ a..m_.1__.

n.4.,

.u~_

n,~___,_...y.-.1__.

w._....,. u w ice r.__

~...

uper diccevery that the-on=c feature ir both Diricienc ye,.,,.

...,.. n_ a*4 : _ 4 rr_re n_.r.. :._. : _ _... _v_n c.r.,i __.-~

u__

w

__u eutemat-ically initieted duc t nspcrabic channcic witMe

$4+c came variebic :: deceribed in the paragraph chevc.

The 4-4: cur Completien Time frc-discovery of 1c00 cf initiation eapability ic acceptable bec vee it minimicec rich Mile a44cui.; t4 =c for recteration of channcia.

Beeawee-of the divarei-ty of cenecrc availabic tc prcvide 4e4t4et4en-sign:1 c and the redundaney--ef-the ECCE decign, en eMeweMe-eut of cervice time of-20 hcure hac beer cheur to bc accept bic (Def. ')

te pcrmit rcctcret-ica cf any

-itneper-able-chan nc! tc CPEP". ELE ctatuc.

If the incfmMo ehannel cannet be rectered tc CPE".^.SLE ct tue withir the allow Mc cut of cccvdec timc, Cond-i t i o n "_ amuct bc cntercd f

1__

m_.

a_

.~

e

__a 1_

n. ~ 3_et._,a

._a__.,

m..~_

n.~..,_.:

-1._._~_

m.,

__h

..~

m

~...

aMew-pleeing-t4*c channel ir trip cinco-tMc articn.:culd eit4,er cauce t4+e-init4* Men er. culd not necesear44y recult fe--a-eafe-etete-fer the channc! ir all eventer 9

1 F.1, F.2, 0.1 a nd 0. 2-N-4,-hhh--and-h;L,.@

These Required Actions are-Required *cticn 0.1 is intended to ensure that appropriate actions are taken if multiple, inoperable, untripped instrument channels for within the same Function results in a complete loss of automatic..

transfer of the suction from the condensate storage tank to

]

suppression pool for'the HPCF and-RCIC.,~.7m.en t i n it i a tion espab444 t y for the "PCC Syctem - Automatic transfer compenent-iniM-amen capability is considered to be lost If 1

the Required Actions. applicable to Functione 2.d, 2;e, 3.' d or 3.e are not met within the allowable Completion Time.

~

4cct i f ~ tua FeneMon 2.d chanecle cr tu: F* net 4 c n 2. c c c ehanne4e--are-**eperabic nd untr4pped,- In this situation (loss of automatic suction swap), the 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> 011cuenee-of-4 4

l (continued)

]

WRf6-ABWR STS B 3.3-144 04/02/93 Pcv 0, 09/23/93 j

4 c

c-

i i

ECCS Instrumentation B 3.3.5.1 BASES ( ACTIONS Continued )

l l

1 ncquired P.ction: D.2.1 cnd 0.2.2 1: _nct :pproprictc 2nd th:

HPCS Cyctem the associated featuresTaust be declared inoperable within'l' hour after' discovery of lors of dansfei

~

HPCC initiat4en capability. As noted, the Required Action ^

is only applicable if the HPCF?orfRCIC-44PGs pump suction is not aligned to the suppression pool,' since, if aligned, the Required' Action runction is already performed.

l The Completion Time is intended to allow the operator time to evaluate and repair any discovered inoperabilities. This Completion Time also allows for an exception to the normal

" time zero" for beginning the allowed outage time " clock."

i For Required Actions. F.1 And G11--D,4, the__ Completion Time

}

enit-begins upon d.iscovery that the automatic; transfer capability. is deemed inoperable.--HPCC Cyctce cannct Te entomatically cligncd to the cupprcccion pocl due to tuc i noper:M c, untripped-ehannel ir the came Funet.+env-The I hour Completion Time from discovery of loss of initiation i

capability is acceptable because it minimizes risk while allowing time for restoration or tripping of channels.

Because of the diversity of sensors available to provide initiation signals and the redundancy of the ECCS design, an allowable out of service time of 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> has been shown to 4

be acceptable [(Ref. 4)) to permit restoration of any inoperable channel to OPERABLE status.

If the inoperable channel cannot be restored to OPERABLE ststus within the allowable out of service time,-+h: ch:nnci muct bc placed in the-t spped coadition per nequi+ed ?.cticn D.2.1 ce the suction source must be aligned to the suppression pool which per-Bequired-Aetion 0.2.2.

Plecing the incperabic channci se-t esp--perf orms the intended function of the channel (shifting the suction source to the suppression pool).

Performance of either of these two Required Actions will allow operation to continue.

If Required Action F.2;or'G.2 D.2.1 or Required Action D.2.2'is performed, measures'should

~

be taken to ensure that the HPCF'or RCIC-HPGG System piping remains filled with water.

  • l t e r-nat e l y, if it ic net desired to perform ncquired 7.ctione 0.2.1 and-0.2.2 l c. sv r ee-in-the cacc whccc chH +ing the cuction ocurce could deein d et- -- the MPCE cuction pipi+9), Ocnd444cn M must be entered l

eM-4te-Bequired-Aebien-tehen, E.1 and-Er2 j

Beguiced-Aedien E.1 is intended to eneuve-that-eppropricte eebiene-ere-teken i f

.u Ft4ple - e noperaM c,

c.t-cipped r

ehannele-withir the LPCs med LPCI Pump Diseharge Fle Low yEypacef-Funet I c n c resuh-in-redundant-automa&& c initinticn capaM44+y-being Icct for the feew rc(c}.

For ncq ueed Aet4cr E.1, the feaw rca uculd-bc thccc that crc in4+4eted by-FuneMc n c.

1.0, 1.f, and 2.0 (c.9.,

1 01. pressere ECCE).

i Redundand-aut.emable-int i s t i c n-eapa b i l i t y 10 lect if three l

of-t h fcur chanacic ceaeeisted with Tunctionc 1.c, 1.f, and 2.c arc i nspeceMc.

Cince cach incpeceMe-ehannc1 uculd j

have ncqui+cd *ction E.1 applied ceparatelyH+efer-te AGT40ME Notat, cach inoper:Me-channel.culd Only requi+e

%c affccted lou proceare-ECG6-pucp tc be deciceed (continued) -09/2S/93 l BWR M-AEWR STS n 3.3-145 04/02/93 nev.

7

1 ECCS Instrumentation B 3.3.5.1 i

BASES ( ACTIONS Continued )

te CPERASLE ctetu:.;i t.hi r th: lleu:bic cut cf cervice ti=c, Genditicn " meet he entered and it: Ecquired tetien tchen.

The Ecquir d Action do not Ollcu pl cing the channci in trip since thic ccticr uculd not ncccesarily recult-4n-e eafe ctate f-er the chcrncl ir 011 cvente.

4 i

H.'1 ".,' -." ".'

Required Action H 1-Fv4 is intended to ensure that i

l appropriate actions are taken if multiple; inoperable, I

untripped channels withir cimilar LOC trip cyctcr Functienc l

result in automatic initiation capability,being. lost for the ADS.

Automatic initiation capability is consideredTtolbe 4.b - are notL met.within~ theiallowable. Completion: Time [.-4eetloat:1f.theIReq I

if eithsr (2)'msE 'th:6~cne'Fnnctien't;; ch5nnc1*:hd'en Functic: ".: chennc1 cre incper:ble end untripped, (b) enc l

Function 4.b channci and on Functicr 5.5 channci arc incperabic nd untripped, cr (c) cnc runction 0.d channci and enc Function 5.d channc1 cre incperable and untripped.

In this situation (loss of automatic initiation capability),

th: 95 hour0.0011 days <br />0.0264 hours <br />1.570767e-4 weeks <br />3.61475e-5 months <br /> cr S day :llcuence,

cpplicabic, cf and all theYassoci Ecquired Ae64cn F.2 ic net pprcpriate, ated ADS valves must be declared inoperable within"l' hour after discovery of loss of ADS initiation capability in both trip systems.

t The completion Time is intended to allow the operator time to evaluate and repair any discovered inoperabilities. This completion Time also allows for an exception to the normal

" time zero" for beginning the allowed outage time " clock."

t Fcr ncqu4 red Action F.ly-The Completion Time only begins upon discovery that the APS cannot be automatically initiated due to inoperable, untripped channels within similar n00 trip cycter Funetienc ac deceribed ir the paregeaph-above.

The 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> Completion Time from discovery of loss of initiation capability is acceptable because it minimizes risk while allowing time for restoration-ee Leipping of channels.

Because of the diversity of sensors available to provide initiation signals and the redundancy of the ECCS design, an allowable out of service time of 8 days has been shown to be acceptable [(Ref. 4)] to permit restoration of any inoperable channel to OPERABLE status-4f both "PCC and PCIC erc OPERABLC.

If cithcr '!PCC cr ECIO ic incpcrab40, the 44mc 10 chcrtened tc 95 hourc.

I f the Ot-atu: Of "PCC cr ECIC changcc cush-t-hat the Completion Time changcc from S day; to 05 heurc, th: 05 hcurc bcgiec upon diccevcry of HPCC cr PCIC inoperability.

"cucvcr, total tim for an 4ettpeceb l e, untr4pped channel cannet :=cced 9 dayc.

I f-the ctatuc-ef "PCC cr PCIC changcc cuch that the Completien Time ebengcc frc 05 heurc to O dcyc, thc " tie: cere" for beginning the S day "clcch" beginc upon dicccvery cf the i

4eeperabic, untripped channel.

If the incpecabic channel eennet be rectered te OPERAELE ct-e&uc within the llcumble cut of ccrvice ti=c, the channel muet bc placcd ir the (continued)

BWR/6-ABWR STS B 3.3-147 04/02/93 ncv 0, 09/28/92 l

~.

4 ECCS Instrumentation B 3.3.5.1 EASES ( ACTIONS Continued )

tripped ccnditien per Ecquired *.ction F.2.

Placing the I

inoperable chaen 1 ir trip.:culd Ocncerv:tively cc=pencetc for the inoperability, r e c t c r e c a pa b i l i+y-+e-ee c c. c.cd c.t c :

eingle-failurc, and :11cu cper: tion tc continuc.

Alte:nately, if it ic net decired te place the ch:nnel in trip (e.g.,

20 ir the cacc uhcre pl cing the incper:bl-e channci ir trip uculd recult ir n initiation;, Ocnditica "

mect be entered Ond it; ncquired *.ction tchen.

l 1.I'and'I.2 2

7 Condition I; occurs when'anyloneiof/th'e four~SLUslyith'in Divisions I,'II, or'III becomes? inoperable.:ThisIcondition/

because of the 2-out-of-2?confirmationiof onefredundantypair of SLUs;before an output:initiationTis; permitted,:results?in the supporting: features-offtheTfailed;SLU; channel?becoming unavailable. However,,the? associated; operable SLUjchannel 1

i can be made available~byfplacing-ths; failed.channelFin1*ECCS 4

channel'out of'servicei bypass.1The operableichannels J

although more' susceptible to spurious tripf willioperate l

normally in'a 1-out-of-1. mode ~unt111theffalled.channe101's repaired."The ECCS bypass, feature;isinormally-gautomatic7and is implemented by self tests that monitor..the. inoperable status of the SLU and also provides an alarm output lto the 2

operator.

A Completion TLme' 'of ? 'ons ' hou'r$ fo'r l placingithelinoperableTSLU

~

channel. in bypass assumes that the operator must?use.the a

manual baekup to the:: automatic-bypass.;The time $6ciodfis

~

sufficient for the operator tofperform!thefaction, The Completion Time for repair 'of Tthelinspera' ole"ch'annel

~

l provides sufficient time to diagnose and effect: repairs.

l Since plant protection is' maintained by=redundantland' independent ECCS' channels,^there is no.significant~...

contribution-to plant risk with-an inoperable SLU'for the allowed completion time.

1 0.1.1 This condition represents:the case where'the two redundant SLUs supporting the same actuated equipment becomes inoperable. Since only one may be placed in bypass..the supported features supported by the SLUs must be declared i

inoperable.

The' Completion time is'sufficle't for the operatorLto n

perform the action and-is. there is no significant contritution to plant risk.for this time period since plant 4

protection is maintained by redundant and independent ECCS i

channels.

i K.1 With any Required Action and associated' Completion. Time not met, the associated feature (s) may be incapable of 9

(continued) swnfe-ABWR STS B 3.3-148 04/02/93 nce 0, 09/25/92 l

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