ML20246P751

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Proposed Tech Specs Re Ac Sources - Operating
ML20246P751
Person / Time
Site: River Bend Entergy icon.png
Issue date: 05/02/1989
From:
GULF STATES UTILITIES CO.
To:
Shared Package
ML20246P745 List:
References
NUDOCS 8905220276
Download: ML20246P751 (12)
v • d • e


Text

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E CLOSURE Proposed Technical Specification Changes i

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i 8905220276 DR 890502-ADDCK 05000458 PNU i

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3/4.8 ELECTRICAL POWER SYSTEMS 3/4.8.1 A.C. SOURCES A.C. SOURCES - OPERATING LIMITING CONDITION FOR OPERATION j

3. 8.1.1 As a minimum, the following A.C. electrical power sources shall be OPERABLE:
a. Two physically independent circuits between the offsite transmission network and the onsite Class 1E distribution system, and l
b. Three separate and independent diesel generators, each with:
1. A separate day fuel tank containing a minimum of 316.3 gallons I of fuel,
2. A separate fuel storage system containing a minimum of 45,495 gallons of fuel, and
3. A separate fuel transfer pump. i APPLICABILITY: OPERATIONAL CONDITIONS 1, 2, and 3.

ACTION:

a. With one offsite circuit of the above-required A.C. electrical p er $

sources inoperable, demonstrate the OPERABILITY of the remain g A.C. l ources by performing Surveillance Requirement 4.8.1.1.1.a thin ur and at least once per 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> thereafter. If ei er diesel gene tor IA or 1B has not been successfully tested hin the past j 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> demonstrate its OPERABILITY by perform 4 Surveillance Requiremen 4.8.1.1.2.a.4 and 4.8.1.1.2.a.5 f each such diesel 1

generator, se rately,'within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. Re re the offsite circuit 1 to OPERABLE stat {

within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or be at least HOT SHUT 00VN within the next 12 urs and in COLD 5 DOWN within the following  !

24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

b. With either diesel generato '

or 18 inoperable, demonstrate the OPERABILITY of the above r i A.C. offsite sources by performing Surveillance Requiremen . 8.1.1. within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> and at least once per 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> thereaft . If the dies generator became inoperable due to any cause er than preplanned ventive maintenance or test-ing, demonstra the OPERABILITY of the re ning OPERABLE diesel generators, parately, by performing Surveil ce Requirements l

4. 8.1.1. .4 and 4.8.1.1.2.a.5 within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> . Restore the inoper-able sel generator to OPERABLE status within 72 urs or be in at i le HOT SHUTDOWN within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and in C0 SHUTDOWN hin the following 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

s test is required to be completed regardless of when the inoperable di 1 generator is restored to OPERABILITY.

RIVER SEND - UNIT.1 3/4 8-1

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ELECTRICAL POWER SYSTEMS LINITING CONDITION FOR OPERATION (Continued)

ACTION (Continued)

c. . With one offsite circuit of the above-required A.C. sources and dies generator 1A or 18 of the above required A.C. electrical power sour as  ;

inoperable, demonstrate the OPERA 3ILITY of.the remaining A.C. sou es

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by performing Surveillance Requirement 4.8.1.1.1.a within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> and at least once per 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> thereafter. If a diesel generator- came inoperable due to any cause other than preplanned' preventive ainte-ance or testing, demonstrate the OPERA 8ILITY of the remai ng OPERA-diesel generators, separately, by performing Surveil nce Require-me s 4.8.1.1.2.a.4 and 4.8.1.1.2.a.5 within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> *. estore at less one of the inoperable A.C. sources to OPERA 8LE atus within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> be in at least HOT SHUTDOWN within the nex hours and in COLD SH within the following 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. Res e at least two offsite c uits'and diesel generators IA and 18 o OPERABLE status within 72 h rs from time of initial loss or b in at least HOT SHUT-DOWN within t next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and in COLD SH within the follow-ing 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

d. With diesel genera r 1C of the above r utred A.C. electrical power sources inoperable, nstrate the OP ILITY of the offsite A.C.

sources by performing surveillance R uirement 4.8.1.1.1.a within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> and at least one per 8 hou thereafter. .If the diesel gener i ator became inoperable as resul of any,cause'other than preplanneo preventive maintenance or sti , demonstrate the OPERA 8ILITY of the remaining OPERA 8LE diesel ge ators, separately, by performing Sur-veillance Requirements 4.8. . .a.4 and 4.8.1.1.2.a.5 within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> *.

Restore diesel generator to RA8LE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or declare the HPCS system d the C SW pump inoperable and take the ACTION required by Spe fications 3. 1 and 3.7.1.1.

a. With diesel generat 1A or 18 of the ove required A.C. electrical power sources ino rable, in addition to king ACTION b or c, as applicable, ver y within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> that al required systems, subsys-tems, trains, onents and devices that d end on the remaining OPERABLE die 1 generator as a source of emer ncy power are also OPERA 8LE, that the C standby service water is OPERABLE if diesel g erator 18 is inoperable; otherwise, be n at least HOT S within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and in COLD SH within the fo11 ng 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
f. Wi both of the above required offsite circuits inoper le, demon-rate the OPERABILITY of three diesel generators, separa ly,.by performing Surveillance Requirements 4.8.1.1.2.a.4 and 4.8. 1.2.a.5 within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> unless the diesel generators are already oper ing.

Restore at least one of the above-required offsite circuits to PERABLE status within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> or be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />. With only one offsite circuit restored to OPERABLE sta s ,.

"This test is required to be completed regardless of when the inoperable diese generator is restored to OPERABILITY.

RIVER BEND - UNIT 1 3/4 8-2

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ELECTRICAL POWER SYSTEMS l LIMITING CONDITION FOR OPERATION (Continued) kACTION(Continued) restore at least two offsite circuits to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> from time of initial loss or be in at least HOT SHUTDOW within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and in COLD SHUTDOWN within the follow g 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. A successful test (s) of diesel generator OPERASILI per Surveillance Requirements 4.8.1.1.2.a.4 and 4.8.1.1.2.a.5, rformed l

' der this ACTION statement for the OPERABLE diesel genera rs, satis-fi the diesel generator test requirements of ACTION st ement a.

g. With esel generators 1A and 18 of the above require A.C. electrical power s rces inoperable, demonstrate the OPERABILI of the remaining A.C. sou es by performing Surveillance' Requireme 4.8.1.1.1.a within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> and t least once per 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> thereafter d Surveillance Requirements 4.,8.1.1.2.a.4 and 4.8.1.1.2.a.5 f diesel generator 1C within 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />
  • Restore at least one of th inoperable diesel ger.e,-

ators 1A and 18 to OPERABLE status within 2 ours or be in at least HOT SHUTDOWN wit n the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and n COLD SHUTDOWN within the following 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. Restore both diesel generators 1A and 18 to OPERABLE status with 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> from t of initial loss or be in at least HOT SHUTDOWN wi in the'next hours and in COLD SHUTOOWN '

within the following 24 ours.

h. With one offsite circuit o the bove-required A.C. electrical power sources inoperable and diese enerator 1C inoperable, apply the requirements of ACTION stet ts a and d specified above.
1. With either diesel gener or 1A o 13 inoperable and diesel generator 1C inop'erable, apply th requireme s of ACTION statements b, d and e specified above.

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This test is required to be completed regardless of when the inoperable dies 1 l generator is restored to OPERABILITY.

RIVER BEND - UNIT 1 3/4 8-3

I ACTION:

a. With one offsite circuit of the above-required AC electrical power sources inoperable, demonstrate the OPERABILITY of the remaining AC sources by performing Surveillance Requir gemen4.8.1.1.1.a within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> _

and at least once per 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> thereafter.1 P cither didcc! gincritir 1.^  ;

cr 1- .:: "c. _ce" Tud 9 uh y 'te:ted within thc post 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, dcmenstr;tc it: OP EP ^.B IL I"' ty perfc ming Survcil knce Rcquircm:nt:

1.S.1.1.2.0.1 rd . cd cu@ _dic cl _ ;^ncrete ,

cc crate!", "4+hin ?' Scur: ' 8. 'M.1  : . 5 _ _fc_r re the ofTsTte s circui t to lPERAB s' M dirs 07 be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and in COLD SHUTDOWN within the following 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

b. With either diesel generator 1A or 1B inoperable, demonstrate the OPERABILITY of the above required AC offsite sources by performing  ;

Surveillance Requirement 4.8.1.1.1.a within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> and at least once per i 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> thereafter. If the diesel generator became inoperable due to any  ;

cause other t an la 3

. or testing,

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. ment .rs .c the "P g H I gTV

_ . thecychfiv^

rcr 4 99 .. g-. nance

_LE d:c;c' g=cratcrt ,- l Separttel;, by per#c 4ng- Surveilknce Rcquircm:nt: 4.0.1.1.2 ;.1 =f  ;

A.8.1.1.2.2.5 ith4- 21 hcurf. within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> *, for each OPERABLE diesel generator separately, either verify that the cause of the diesel  !

generator being inoperable does not impact the OPERABILITY of the OPERABLE diesel enerator or erform Surv 111ance _ Requirement 4.8.1.1.2.a.4. estore 1 M opera le diese generator to v tNA LE I s atus wit in 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> or be in at least H0T SHUTDOWN within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and in COLD SHUTDOWN within the following 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

c. With one offsite circuit of the above-required AC sources and diesel .

generator IA or 1B of the above required AC electrical power sources l inoperable, demonstrate the OPERABILITY of the remaining AC sources by performing Surveillance Requirement 4.8.1.1.1.a within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> and at least once per 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> thereafter. If a diesel _ generator became .

inoperable due to an c u e ot h "rc~vchtive7 maintenance  !

or t stin , de~"rtrete the ' .

PEP AB._ITV cf_ crc 214g0PER^BLEdicic]  :

g =c ra .c r. , reparately, 5" perfc--ing Surycil knce Rcquircm:nt ,

1.S.1.1.2.2.' and 1.S.I.1.2.c.5 within 0 hour0 days <br />0 hours <br />0 weeks <br />0 months <br /> % within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> *, for  !

each OPERABLE diesel generator separately, either verify that the cause  ;

of the diesel generator being inoperable does not impact the OPERABILITY  ;

of the OPERABLE di.sel enerator or perform SurvyeilJance i Requirement 4 8.1.1.2.a.4. Restore a ^ N operable AT sources to P s a us within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> or be in a least H0T SHUTDOWN within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and in COLD SHUTDOWN within the following 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

Restore at least two offsite circuits and diesel generators IA and IB to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> from time of initial loss or be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and ir COLD SHUTDOWN within l the following 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

d. With diesel generator 1C of the above required AC electrical power i sources inoperable, demonstrate the OPERABILITY of the offsite AC sources by performing Surveillance Requirement 4.8.1.1.1.a within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> and at  !

least once per 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> thereafter. If the diesel generat became inoperable as a result of any cause other than preplanne prcventr^ l

  • ThidEQ is required to be completed regardless of when the inoperable l diesel generator is restored to OPERABILITY.

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0 a ntenance or testing, _ ,.,- ... _ . . _o_

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0, Eaf "- a c ',c ! gc..c ra tc rc , cpa ra tely, by p ^"c r= %g Surve411:nce-

- "cquirement ' .84.1.2.0.' and ', .8.1.1.2.0. 5 .;ithin 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />'. within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> *, for each OPERABLE diesel generator separately, either verify that the cause of the diesel generator being inoperable does not impact the OPERABILITY of the OPERABLE diesel generator or perform Surveillance ,

Requirement 4.8.1.1.2.a.4.J 7 e h sdT generator IC t M ERABLE~

s a us wit u n F Eours~ or declare the HPCS system and the C SSW pump inoperable and take the ACTION required by Specifications 3.S.1 and 3.7.1.1.

e. With diesel generator 1A or IB of the above required AC electrical power sources inoperable, in addition to taking ACTION b or c, as applicable, verify within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> that all required re undant systems, subsystems, l trairs, components and devices that depen on e remaining OPERABLE diesel generator as a source of emergency power are also OPERABLE, and that the C standby service wa ytEmp is OPERABLE if diesel generator 1B is inoperable- otherwised ei'ther ' de~cla're ' inoperable"the' redundan systerils , Tuts'y'ste'ms', ' trbins , components and devices served by the inoperable diesel genera tor and take the ACTION required by the associa ed S ecif cation (s) for both divisional components inoperable or e in at eas OT HUIDUWN nTiii" COLD 3HUIDO within the following 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />,
f. ih o t ab ve r u ed of hf ircuit fiqqperable,hc7:trkte

- t..c OPEPfw!L JY c, t; rec dicM-geneeaters , scp F tcly, 'by performing-Surycillance Requirement: A g },},} 3,A 3pd A g } },},q,g_ ,,jt ~

jg g_ gngyg enwater nrealready_cp_cratiq./YeiFtoreatleastone P'^n 4^ dic c' the a ove-required of site ciFcuiTs to 0PIRABLE shatus within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> o

or be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />. With only one offsite circuit restored to OPERABLE status, restore at least two offsite circuits to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> from time of initial loss or be in at least HOT SHUTDOWN with and_in COLD SHU 0WN withi he f 1 i 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. , cuca .,,. test m of dic cl genera.cr 0.ERf" LI,Y pcr SrhiS:c P.cqui rement: '.S.I.E.2.0."

, and A.9.1.1.2.3.5, perfor-^d under -this ^CTIO." statem^nt fce-the OPE"^BLE--

die ^1 generatert, ::tisf4c: the dic:cl gencr tcr tc;t rc uirement; of

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g. With diesel generators 1A and IB of the above required AC electrical power sources inoperable, demonstrate the OPERAn7LITY of the remaining AC sources by performing Surveillance Requiremen 4 .1.1. n 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> _

ada 1 ast on er 0 honrs thereafter an in ours*' e'ither veri y ta tle cause s) of lese genera ors 1A and 1B being inoperable do not j mp_ac_t the J PERABILITY of diesel generator 1C or erform urvei lance _ Requ 4.8.1.1.2.a.4 R nd_ j.P.1.1.2.2.5 or diese generator 1 c. itP r._ . cur; . Restore at least one or e inoperable diesel genera ors A and- o OPERABLE status within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> or be in at least POT SHUTDOWN within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and in COLD SHUTDOWN within the following 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. Restore both diesel generators IA and IB to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> from time of initial loss or be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and in COLD SHUTDOWN within the following 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

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  • This&;g lsg is required to be completed regardless of when the inoperable l diesel generator is restored to OPERABILITY.

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h. 'With one offsite circuit of the above-required AC electrical power sources inoperable and diesel generator 1C inoperable, apply the - ,

requirements of ACTION statements a and d specified above.

1. With either diesel generator IA or 18 inoperable and diesel generctor IC inoperable, apply the requirements of ACTION statements b, d and e specified above.

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ATTACMENT 2 GULF STATES UTILITIES COMPANY RIVER BEND STATION j DOCKET 50-458/ LICENSE NO. NPF-47 AC SOURCES - OPERATING (88-017)

LICENSING DOCUMENT INVOLVED Technical Specification Bases ITEM: 3/4.8 PAGES: 8 3/4 8-1

' REASON FOR CHANGE This Bases change.is provided to more clearly define which equi is i required to be verified as operable when diesel generator (DG)pment 1A or 1B becomes inoperable. This change will . reduce unnecessary plant shutdowns when safe continued operation would normally be allowed by the current Technical Specification opera'o ility requirements and Action statements.

The BWR Owners Group-Technical Specification Comittee has endorsed River Bend Station as a lead plant for this concept for inclusion in the industry Restructured Technical Specification effort. Therefore, Gulf States Utilities- (GSU) requests this change be reviewed on a schedule consistent with the support necessary for the industry Restructured Technical Specifications which are currently scheduled to be submitted for NRC review in May 1989.

DESCRIPTION The current Standard and RBS Technical Specifications require that, within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> of the Division I or II DG becoming inoperable, all required systems, subsystems, trains, components and devices that depend on the remaining operable Divisien I or II DG as a source of emergency power be verified as operable. If this condition cannot be met, the plant is required to be placed in H0T SHUTDOWN within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and in COLD SHUTDOWN within the following 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. The Sses for this Action requirement state that this requirement is intended to provide assurance that a loss of offsite power, during the period that the Division I or II DG is inoperable, will not result in a complete ' loss of safety function of critical systems.

There are many systems, subsystems, trains, components and devices which  ;

depend on a CG as a source of emergency power that do not represent a significant safety function of critical systems. This is judged by their associated Action requirements when all redund6nt components are inoperable.

In many instances there are remedial actions which would allow continued plant operation (i.e., fuel building radiation monitors - if both are inoperable, operation may continue with the fuel building ventilation system running in the emergency modo and periodic grab samples of the effluent being taken and containment isolation valves may be inoperable indefinitely if the penetration is isolated).

Page 1 of 3

The current requirements of Action e can result in unnecessary plant shutdown when the current Technical Specification Action statements for the affected equipment allow continued operation for a time period longer than 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> when both redundant pieces of equipment are in fact not capable of performing their intended functions. The current Action requirements for the affected equipment should determine l'f an immediate plant shutdown should be initiated since they have been established to support safe operation based upon the  !

affect of the loss of the equipment's safety function (s).

AdditiotTily, there are systems / components that are supplied emergency power i by the Dus that do not have Technical Specification operability req ^ ements j and are not necessary for safe shutdown of the plant. Furth, , some i instruments are not redundant and are served by only one DG. An example of the latter at RBS is the wide range gas radiation monitors required by Regulatory Guide 1.97. Regulatory Guide 1.97 does not require redundancy or standby power. However, at RBS they are provided with emergency power from the Division I DG. Inoperability of one of these radiation monitors would currently cause a plant shutdown in the event the Division II DG becomes inoperable. Another example of an instrument of this type at RBS is the safety / relief valve acoustic monitors required by Regulatory Guide 1.97 which are provided emergency power from the Division II DG.

Exemples of systems / components served by the DGs at RBS which do not have Technical Specification operability requirements are:

- turbine building normal 480V motor control centers auxiliary building normal 480V motor control centers >

- normal battery chargers

- drywell unit coolers

- normal and alternate power to the reactor protection system busses reactor building polar crane standby cooling tower service crane This change to the Bases for Action e was made to clearly define which equipment is required to be verified operable per this Technical Specification Action requirement. Equipment which fails safe upon a loss of power and equipment which is not required to safely shut the plant down and maintain it in a safe shutdown condition in conjunction with a loss of offsite power are not critical systems as described in the current Bases for Action e. Therefore, that equipment, as well as equipment which is supplied J emergency power by the DGs but do not have Technical Specification I operability requirements, are not contained on the list of equipment to be l verified operable.

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The list of equipment to be verified operable was developed by first reviewing all components supplied emergency power by the DGs to determine which redundant components that require emergency power to perform their safety function have Technical Specification operability requirements in j Operational Conditions 1, 2 or 3. This list was then compared to the Action l requirements when both redundant components are in fact not capable of performing their intended safety function (s). Those components which have Action statements greater than 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> for a complete loss of the safety I function for that system were eliminated from the list since plant operation

, would continue to be limited to 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> with a DG inoperable. At RBS, only two subsystem's Action requirements allow continued plant operation for less Page 2 of 3 I ,

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than 72. hours. with both redundant components inoperable: containment unit coolers (Technical Specification 3.6.3.2) and accident monitoring-drywell and containment hydrogen. concentration analy7er and monitor (Technical Specification 3.3.7.5). For these two systems, _it is anticipated that, should the verification required by Action e not be completed satisfactorily, both subsystems would be declared inoperable (per the proposed. revision to Action e)-to allow continued plant operation for less than 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> consistent.with the system's Technical Specification Action requirement. The remaining Action statements for the systems listed do not allow continued

. plant operation'for a complete loss of their safety functions. Thus, immediate plant shutdown would be required to be taken per Action e.

This Bases change will provide the same degree- of safety for those  !

significant critical systems while allowing the operational flexibility intended for less critical emergency powered systems / components. Therefore, this change will ensure that the required actions will be consistent with the level of safety as described in the Technical Specification Actions for the affected equipment and the existing Bases for Action e.

REVISED BASES The revised Bases are provided in the Enclosure.

SCHEDULE FOR ATTAINING COMPLIANCE River Bend Station ~is currently in compliance with the applicable Technical Specification Bases. To support -the industry Restructured Technical

. Specification effort, GSU requests that these changes be reviewed on a schedule consistent with the support necessary for the industry Restructured .

Technical Specifications which are currently scheduled to be submitted for NRC review in May 1989.

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ENCLOSURE Revised Technical Specification Bases l

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3/4.8 ' ELECTRICAL POWER' SYSTEMS _S BASES 3/4.8.1, 3/4.8.2 and 3/4.8.3 i

A.C. SOURCES, D.C. SOURCES and ONSITE POWER.

DTITRTRUTION SYSTEMS '

.The OPERA 8ILITY of the A.C. and D.C. power sources.and associated distribution systems during operation ensures that sufficient power will be available to supply the safety related equipment required for the safe shutdown of the facility and.the mitigation and control of accident condi-tions within the facility. The minimum specified independent and redundant A.C. and 0.C. power sources and distribution systems satisfy the requirements of General Design Criterion 17 of Appendix "A" to 10 CFR Part 50.

.The ACTION requirements specified for the levels 'of degradation of the power sources provide restriction upon continued facility operation commen-surate with the level.of degradation. The OPERA 8ILITY of the power sources is consistant with the initial condition assumptions of the safety analyses and.is based upon maintaining OPERABLE at least Division I or II of the onsite A.C. and 0.C. power sources and associated distribution systems during accident conditions coincident with an assumed loss of offsite power and single failure of the other onsite A.C. or D.C. source. Division III supplies the high pressure core spray (HPCS) system and the standby service water pump ISWP*P2C with its auxiliaries . -

k

'The A.C.. and D.C. source allowable out-of-service times are based on

Regulatory Guide .1.93, " Availability of Electrical Power Sources," December 1974, as mod,1fied by plant-sp'ecific analysis and diesel generator. manufacturer's 3 recommendations. When diesel generator 1A or 18 is inoperable, there is an j q

- additional ACTION requirement to. verify that all required systems, subsystems, l trains, componer.ts and devices, that depend on the remaining OPERA 8LE diesel generator 1A or 18 as a source of emergency power, are also OPERA 8LE. This .l requirement is intended to provide assurance that a loss of offsite power, l "lNSERT !" i during the period that diesel generator 1A or 18 is inoperab%111 not result '

in a complete loss of safety function of critical systems. vina term verify, as used in this context, means to administrative 1y check, by examining logs or other l information, to determine if certain components are out of service for mainte-nance or other reasons. It does not mean to perform the surve_filance reauire-Eents needed to demonstrate the OPERABILITY of the component.QSEQ2) l The OPERA 8ILITY of the minimum specified A.C. and D.C. power sources and associated distribution systems, during shutdown and refueling, ensures that the. facility can be maintained in the shutdown or refueling condition for extended time peri,ods and sufficient instrumentation and control capability is available for monitoring and maintaining the unit status.

The surveillance requirements, for demonstrating the OPERA 8ILITY of the diesel generators, are in accordance with the recommendations of Regulatory

' Guide 1.9, " Selection of Diesel Generator Set Capacity for Standby Power Supplies," March 10, 1971, and Regulatory Guide 1.108, " Periodic Testing o'f Diesel Generator Units Used as Onsite Electric Power Systems at Nuclear Power Plants," Revision 1, August 1977, as modified by plant-specific analysis and diesel generator manufacturer's recommendations.

I RIVER BEND - UNIT 1 8 3/4 8-1

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' " INSERT I'! for page B 3/4 8 '

Critical systems are those systems that require emergency power to safely _ ,

shut down the plant and maintain it in a safe shutdown condition in '

conjunction with a loss of offsite power. Equipment which " fails safe" upon I a loss of power are not included. The following systems / subsystems are l required to be verified OPERABLE per this ACTION requirement:

1. one channel of the accident monitoring drywell and containment hydrogen concentration analyzer and monitor
2. two leak detection subsystems per Technical Specification 3.4.3.1 3.- two' low pressure ECCS subsystems .
4. one main steam positive leakage control subsystem
5. one penetration valve leakage control subsystem i
6. one safety-related primary containment unit cooler
7. one suppression pool cooling subsystem of RHR
8. one standby gas treatment system i
9. one shield building annulus mixing subsystem
10. one fuel building ventilation charcoal filtration subsystem
11. one primary containment hydrogen recombiner
12. one primary containment /drywell hydrogen mixing subsystem
13. one primary containment /drywell hydrogen ignitor subsystem
14. one standby service water subsystem with both pumps operable
15. the standby cooling tower with two fan cells operable
16. .one main control room air conditioning subsystem

-The above systems / subsystems are required to be capable of being powered by the OPERABLE ~ diesel generator 1A or 18. Systems whose ACTION requirements are 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or longer for a complete loss of its safety function are not included on the above list. Continued plant operation is limited to 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> with diesel generator 1A or 1B inoperable.

" INSERT 2" for page B 3/4 8-1 When a diesel generator becomes inoperable due to any cause other than preplanned maintenance or testing, there is a requirement in the ACTION to, for each OPERABLE diesel generator separately, either verify that the cause of the diesel generator being inoperable does not impact the OPERABILITY of the OPERABLE diesel generator or perform Surveillance Requirement i 4.8.1.1.2.a.4. The term verify in this context means to determine by visual inspection, functional test or other means that the subsystem will perform its function. For diesel generators made by different manufacturers, this I verification may consist of a determination that the cause cannot exist if the comparable subsystem is of a different design.

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