ML20077F124

Proposed TS SRs for Reactivity Control Sys

ML20077F124
Person / Time
Site:	Davis Besse
Issue date:	12/06/1994
From:	CENTERIOR ENERGY
To:
Shared Package
ML20077F122	List: ML20077F120 ML20077F124
References
NUDOCS 9412130273
Download: ML20077F124 (13)

Text

_ _ _ _

, Docket Number 50-346 License Number NPF-3 Serial Number 2249 Attachment Page 6 APPt ICAB IL ITY l SURVEILLANCE REQUIREMENTS

! 4.071 Surveillance Requirements shall be applicable during the.0PERATIONAL t" NDES or other conditions specified for individual Limiting Conditions for Operation unless otherwise stated .in an individual Surveillance Requirement.

4.0.2 -Each Surveillance Requirenent shall be performed'within the specified '

time interval with.a maxisam allowante extension not to exceed 25 percent of the scecified surveillance interval.

4.0.3 Failure to perform a Surveillance Requirement within the' allowed surveil-

! lance interval, defined by Specification 4.0.2. shall constitute noncompliance with the OPERABILITY requirements for a Limiting Condition for Oparation.

The time. limits of the ACTION requirseents are applicable at the time it is identified that a Surveillance Requirement has, not been performed.

The ACTION requirements may be del &yed foF up to 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> to pecurit the comple-d tion of the surveillance when the' allowable (equipment inoperability) outage

' time limits of the ACTION requirements are less than 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. I t

Surveillance requirements do not'have to be perfomed on inoperable equipment.

4.0.4 Entry into an OPERATIONAL H00E 'or other specified applicability condition shall not be made unless the Surveillance Requirement (s) associated with the Limiting Condition for Operation have been perfomed within the stated surveil-lance interval or as.otherwise specified. ,

4.0.5 Surveillance Requiranents for inservice inspection and tasting of ASME Code Class 1, 2 and 3 components shall be applicable as follows:

-c. During-the-time-periods

1. P.;; issuanca Of-th: Ticility Op:r: ting !A :.:: :: th: : tar 4-of-- i j :' facility e-. ciel op;r:tice, in:;rvice-testing Of ASME-Code- ,

l 5  : f  ? :b -

ec im =ti=, :e .e=2 er:: e me.= a e=+ .

. 4pectf4c W relief $n 5:r ; t-tM by t : CMesh. p j 0L , 2. F011c ing ;m of f cility :- mi:1 ;=tir. ' senice inspection of ASME Code Class 1. 2 and 3 component and inservice testing of ASE Code Class.1. 2 and 3 pumps and valves shall be i performed in accordance with Section XI of the ASME Soiler and Pressure Vessel Code and applicable Addenda as required by 10.CFR 50, Section 50.55ajvi, sc@t wta e specif t: ritt-cel4eHes-been-9eanted4y-the-Gemmissten-pvesvant-to-10 CFR-50.

w

• n_50.SSa(g)(4)( &

b. Surveillance intervals specified in Section XI of the ASME Boiler and Pressure Yessel Code and applicable Addenda for the inservice inspec-tion and testing activities required by the ASME Boiler and Pressure Vessel Code and acclicable Addenda shall be applicable as follows in these Technical 5:ecifications:

' AVIS-BESSE. UNIT 1 3/4 0-2 Amenennt No. 77.J A0.145 9412130273 941206 PDR ADOCK 05000346 p PDR

~

Docket Number 50-346 License Number NPF-3 n l"-

Serial Number 2249 Attachment mR IIREU tnu PM ny{l{i

' ~ '

APPLICABILITY FORINFORMATION DNIY SURVEILLANCEREQUIREMENTS(Continuedi l ASME Boiler and Pressure Vessel Code and applicable- Required frequencies Addenda terminology for for performing inservice inservice inspection and inspection and testing testing criteria activities Weekly At least once per 7 days Monthly At least once per 31 days Quarterly or every 3 months At least once per 92 days Semiannually or every 6 months At least once per 184 days Yearly or annually At least once pdr 366 days i

c. The provisions of Specification 4.0.2 are applicable to the above required frequencies for performing inservice inspec-tion and testing activities.

d. Performance of the above inservice inspection and testing-activities shall be in addition to other specified .

Surveillange Requiremen,ts.

1

e. Nothing in the ASME Boiler and Pressure Vessel Code shall be construed to supersede the requirements of any Technical Specification.

DAVIS-BESSE, UNIT 1 3/4 0-3

Docket Number 50-346' License Number NPF-3 Serial Number 2249 Attachment Page 8 l APPLICABILITY BASES ACTION requirements, e.g., Specification 3.0.3, a 24-hour allowance is provided to permit a delay in implementing the ACTION requirements. This provides an adequate time limit to complete Surveillance Requirements that have not been perfonned. The purpose of this allowance is to pemit the completion of a surveillance before a shutdown is required to comply with ACTION requirements or before other remedial measures would be re;uired that may preclude comple-tion of a surveillance. The basis for this allowance includes consideration for plant conditions, adequate planning, availability of personnel, the time required to perform the surveillance, and the safety significance of the delay in completing the required surveillance. If a surveillance is not completed within the 24-hour. allowance, the time limits of the ACTION requirements are applicable at that time. Wheq a suryeillance is performed within the ~24-hour allowance and the Surveillance Requirements are not met, the time limits of the ACTION requirements are applicable at the time that the surveil, lance is terminated.

Surveillance Requirements do not have to be performed on inoperable equip-ment because the ACTION requirements define the remedial measures that apply.

However, the Surveillance Requirements have to be met to demonstrate that inoperable equipment has been restored to OPERABLE status.

4.0.4 This specification ensures that the surveillance activities associated with a Limiting Condition for Operation have been performed within' the specified time interval prior to entry into an OPERATIONAL MODE or other applicable condition. The intent of this provision is to ensure that surveil-lance activities have been satisfactorily demonstrated on a current basis as required to meet the OPERABILITY requirements of the Limiting Condition for Operation.

Under the terms of this specification, for example, during initial plant startup or following extended plant outages, the applicable surveillance activities must be performed within the stated surveillance interval prior -

to placing or returning the system or equipment into OPERABLE status.

4.0.5 This specification ensures that inservice inspection of ASME Code Class 1, 2 and 3 components and inservice testing of ASME Code Class 1, 2 and 3 pumps and valves will be performed in accordance with:a periodically updated version of Section XI of the ASME Boiler and Pressure Vessel Code and Addenda as required by 10 CFR 50.55a. nclicf fr a ony of the obeve requirement: hu been-preided " -it4ag by the Cc-intien end is not a part of there tec"ica' speci'icatient; This specification includes a clarification of the frequencies for perform-ing the inservice inspection and testing activities required by Section XI of the ASME Boiler and Pressure Vessel Code and applicable Addenda. This clarification is provided to ensure consistency in surveillance intervals throughout these Technical ?cci'i:P4ns and to remave any ambiguities relative to the frequencies for performing the required inservice inspection and testing activities.

DAVIS-BESSE. UNIT 1 B 3/4 0-3 Amendment No. 145

D'ocket Number 50-346 LicInse Number NPF-3 p ,<

S: rial Number 2249 rr"' Tills PAGE PRutDED _

APPLICABILITY BASES Under the terms of this specification, the more restrictive requi.rements l of the Technical Specifications take precedence over the ASME Boiler'and:

Pressure Vessel Code and applicable Addenda. For example, the requirements of Specification 4.0.4 to perform surveillance activities prior to entry into an OPERATIONAL MODE or other specified applicability condition takes precedence over the ASME Boiler and Pressure Vessel Code provision which allows pumps to ba tested up to one week after return to normal operation and for example, the Technical Specification definition of OPERABLE does not grant a grace period before a device that is not capable of perfonning its specified functions is declared inoperable and takes precedence over the ASME Boiler and Pressure Ver.sel provision, which allows a valve to be incapable of performing its '

specified function for up to 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> before being declared inoperable.

- .- ----- . . . . - - n ,a n a te ndment No. 145 i

Dockst Number 50-346 l

Lictnsa Number NPF-3 Seriel Number 2249 Attachment Prge 10 .

Q%lU ll Rf%IL s stU u awbw REACTIVITY CONTROL SYSTEMS 1 l 3/4.1.2 BORATION SYSTEMS FLOW PATHS - SHUTDOWN l

LIMITING CONDITION FOR OPERATION ,

3.1.2.1 At least one of the following boron injection flow paths shali be OPERABLE.

A flow path from the concentrated boric acid storage system (

a.

via a boric acid pump and a makeup or decay heat removal (OHR) l l

pump to the Reactor Coolant System, if only the boric acid storage system in Specification 3.1.2.8a is OPERABLE, or

b. A flow path from the borated water storage tank via a makeup '

or DHR pump to the Reactor Coolant System if only the borated  ;

water storage tank in Specification 3.1.2.8b is OPERABLE.

i l APPLICABILITY: MODES 5 and 6.

ACTION _: l With none of the above flow paths OPERABLE, suspend all operations l involving CORE ALTERATIONS or positive reactivity changes until at least i one injection path is restored to OPERABLE status. l l

SURVEILLANCE REQUIREMENTS 1

~4.1. 2.1 At least one of the above required flow paths shall be demon- l strated OPERABLE:

a. At least once per 7 days U) by verifyi that the pipe tempera- l 1 ture of the heat traced portion of the 71ow path is > 105'F . j when a flow path from the concentrated boric acid storage system is used, and l

b. At least once per 31 days by verifying that each valve (manual, power operated or automatic) in the flow path that is not .

locked, sealed or otherwise secured in position is in its correct position.

l U}If the 7 day verification falls during transfers of makeup water or dilute boron solutions (fluid source concentration of less than 5000 ppmB), the verification period may be extended up to 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> after the addition of dilute boron solution has been stopped for a period of at least 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.

DAVIS-BESSE, UNIT 1 3/41-6 Amendment No. 67 l

. . Docket Number 50-346

, License Number NPF-3 p Ul Serial Nu:aber 2249 Attachment g g[

REACTIVITY CONTROL SYSTEMS FORINFOMATION DNLY l

FLOV PATHS - OPERATING L'IMITING CONDITION FOR OPERATION 3.1.2.2 Each of the following boron injection flow paths shall be OPERABLE:

a. A flow path from the concentrated boric acid storage system via a boric acid pump and makeup or decay heat removal (DHR) pump to the Reactor Coolant System, and

b. A flow path from the borated water storage tank via makeup or DER pump l to the Reactor Coolant System. -

)

APPLICABILITY: H0 DES 1, 2, 3 and 4. I ACTION:

a. Vith the flow path from the concentrated boric acid storage system inoperable, restore the inoperable flow path to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or be in at least HOT STANDBY and borated to a SHUTDOVN MARGIN equivalent to 1% ok/k at 200'F vithin the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />; restore the flow path to OPERABLE status within the next 7 days or be in COLD SHUTDOVN vithin the next 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

b. Vith the flow path from the borated vater storage tank inoperable, restore the flow path to OPERABLE status within one hour or be in at least HOT STANDBY vithin the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in COLD SHUTDOVN vithin the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

SURVEILLANCE REQUIREMENTS 4.1.2.2 Each of the above required flow paths shall be demonstrated-OPERABLE:

a. At least once per 7 daysII) by verifying that the pipe temperature of the heat traced portion of the flow path from the concentrated boric

,j acid storage system is 1 105'F.

l If the 7 day verification falls during transfers of makeup water or dilute i boron solutions (fluid source concentration of less than 5000 ppmB), the verification period may be extended up to 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> after the addition of Ili dilute boron solution has been stopped for a period of at least 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.

,I I

DAVIS-BESSE, UNIT 1 3/4 1-7 Amendment No. 47/ ,

135 1

Dorket Number 50-346 Liceni.e Number NPF-3 Serial Number 2249 Attachment Page 12 RjiACTIVITY CONTROL SYSTEMS

'3URVEltLANCE REOUIREMENTS (Continued)

b. At least once per 31 days by verifying that ene.S ralve (manual, power operated or automatic) in the flow path thot is not locked, sealed, or otherwise secured in position, is in,its correct rcsition.

TlilS PAGE PROVIDED FORINFORMATION ONLY e

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OAVIS-BESSE. UNIT 1 3/4 1 3

- Docket Number 50-346

- . License Number NPF-3 Serial Number 2249 Attachment l Page 13 j I

REACTIVITY CONTROL SYSTEMS MAKEUP PUMP - SHUTDOWN l

1 l

LIMITING CONDITION FOR OPERATION )

3.1.2.3 At least cne makeup pump in the boron injection flow path ,

required by Specif*. cation 3.1.2.1 shall be OPERABLE and capable of  !

. being powered from an OPERABLE essential bus.  !

l APPLICABILITY: MODE 5*. l 1

ACTION: I With no makeup pump OPERABLE, suspend all operations involving positive reactivity changes until at least ons makeup pump is restored to 0PERABLE status.

l l

l SURVEILLANCE REQUIREMENTS M MM ME

/ a.d.AIflou.1.ition to th; Surveillance #Requirementg4ef Specific  :

4.1.2.3 in .j/o 1 4.0.5 4t 1:::t th: :50;; ::k:;p p;;; :h-1,1 5 demostr ted 0F:PJOL: ::

10 t en: 'per ?! eye by: Me. 4 p ph (A..b le .

c. Storting (unless lre:dy Op;r: ting) the pump frer, th: : ntr01 -

-ceem, j

b. Ytrifyfes, th:t : rc:fr:cl:tf0n ' lee. :50 pu p det:1 p.,5 2 l 44+sh rge pre::ur: Of 3,2400 p !g. ,

0. Verifying th:t th: pt p Oper:te: for :t le::t 15 '9etee.

-d. V rifying th t th: pump is eligned to r:ctiv cicetri:01 p '.:Or E,,.... .. A.n f B.-A n t.P. . . . .-64.

m... .

1 L. ,

With RCS pressure 3,150 psig. l l

i l

l DAVIS-BESSE, UNIT 1 3/4 1-9 l.

I

'y c- Docket Number 50-346

' License Number NPF-3 Serial Number 2249 Attachment Page 14 REACTIVITY C0tTTROL SYSTEMS MAKEUP PUMPS - OPERATING

~

LIMITING CONDITION FOR OPERATION i

3 1.2.4 Two makeup pumps shall bs 3PERABLE.

APPLICABTLITY: MODES 1, 2, 3 and 6*.

ACTION:

Vith only one makeup pump OPERABLU, restore the inoperable pump to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or be in at least HOT STANDBY and borated to a SHUTDOVN MARGIN equivalent to 1% ok/k at 2 M*F vithin the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> restore two pumps to OPERABLE status within the next 7 days or be in COLD SHUTDOVN vithin the next 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />. .

I SURVEILLANCE REQUIREMENTS No a.dd,i-ha n a l I .(fa$llant.e. ke. EftawAb M M ODE kJ 4.1.2.4 L dditi  :: :h: :::quir:::::: :f SpkLeification 4.0.5, *+

cl :s: 0"""1."'_" :: 1:::t ::: p:: 31 d y:

.by+ tv; d.rt::k;;hIIc:,A.h

% E.#- -- p; ".:11- :: d:::::t::::d

-. S::::in; (2:1::= :1 ::dy p::::ing) :: d ;r; f::: 2: :::: d1 ::: ...

h. '.': ifying, th:: :: :::i:: 12:100 fler, ::d ',=; d:::1:;: : diedreg+- '

.grecrure Of 1 2 W .psig.

<.. ::ifying th:: :::h p=p :p:::. :: f: :: 1:::: 15 =inet::.

d. '!::ifying th:: :: 2 ;= p to-41&; :d t: ::::! : 01::::!ce' pe"er f re"'

sepeee4+-OPERABLE-eeeenti:1 in::::.

• Vith RCS pressure 2,150 psig.

DAVIS-BESSE, UNIT 1 3/4 1-10 Amendment No.135

. Docket Number 50-346 License Number NPF-3 Serial Number 2249 Attachment Pa'ge 15 REACTIVITY CONTROL SYSTEMS BORIC ACID PUNP - SHUTDOWN LIMITING CONDITION FOR OPERATION 3.1.2. 6 At least one boric acid pmnp shall be OPERABLE and capable of being powered from an OPERABLE essential bus if only the flow path through the boric acid pump in Specification 3.1.2.la is OPERABLE.

APPLICABILITY: MODES 5 and 6.

ACTION:

With no boric acid pump OPEPABLE as required to complete the flow path of Specification 3.1.2.la, suspend all operations involving CORE ALTERATIONS or positive reactivity changes until at least one boric acid punp is restored to OPERABLE status.

SURVEILLANCE REQUIRENENTS

- c,ne_t .&,n #4ase, re$ude.d. kS o M.l y 4.1. 2. 6 fud.ddrh.

In addition to the Surveillance RequirementsAef Specificition .

d ren 4*ated-4.0.5/ t le :t th: :bev: :q fred b ric-acid OPCPAOLE at least cacc per ':1 d:y: by:

p" p th:11 b1t..

4.re. o P P h ea .b ,g

2. Starting (unles: 31 m edy eparating) the pump # m the centel-

-reem

t. Verifying that---the p=p dev010p; at least 92% cf the discharge -

pressure for the applicabic f4cw r:tc : dete H 9ed # m the mawfaetereels-P=p "crformance Cur've at discharge 5.wssuse t 45 prig.

-c. Ver4fy4mppump cperation r3,_at_14act 15 -4nutes;

-d. VetWy4ng-t4at-the-pump 1 aligred to -receive electrical

-power-from-an-09 ERA 8LE--essential bus, I 1 i

DAVIS-BESSE. UNIT 1 3/4 1-12

Docket Number 50-346 License Number NPP-3

. Serial Number 2249 Attachment Page 16 REACTIVITY CONTROL SYSTEMS BORIC ACID PUMPS - OPERATING LIMITING CONDITION FOR OPERATION 3.1.2.7 At least one boric acid pump in the boron injection flow path required by Specification 3.1.2.2a shall be OPERABLE and capable of being powered from an OPERABLE essential bus.

APPLICABILITY: MODES 1, 2, 3 and 4.

ACTION:

With no boric acid pump OPERABLE, restore at least one boric acid pump to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or be in at least HOT STAN08Y and borated to a SHUT 00WN MARGIN equivalent to 1% ak/k at 200*F within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />; restore at least one boric acid pump to OPERABLE status within the next 7 days or be in COLD SHUTOOWN within the next 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

l SURVEILLANCE REQUIREMENTS No a di.taoast

" " "'%%b #

4.1.2.7 In additi:n t: th: Surveillance Requirement %4pf Specification 4.0.5 r t 1:::t On: beri: : id pr p th:115: d:::::tr t:d OPEP^SLE att l 1:::t :::: per 31 d:y: by: a.rt A.FP/; ab /t.. ,,..

~

4. St:rting(unle:: lr :dy Ope,r tiCg) the pump ff th: ::Ctr:} f i

-P995, l

-b. Verifying that the perp d: vel:p: :t 10 :t 93% cf the di: h:rg:

= pre::ure f:r th: :pplic:51: '1:; r:t: :: deterrined 'rer the manufacturer': " ump Perfere:rce Cury: :t : discharge pr:::ere m cc-

-,4m r- s-l

c. Verifying-pump Operati:n f r :t-le::t 15 'nutes.

-d . Verify ng t-hat-the pump i d ligned t: re: ive electri:31 p wer

=f r:m en OoEP^3tE :::enti:1 Suss a DAVIS-BESSE, UNIT 1 3/4 1-13

Dock,et Number 50-346

• License Number NPF-3

' Serial Number 2249 Attachment vgg y g

'# h , g. rY, . y$

EfACTIVITY CONTROJJYSTEMS r e e BASES Un sigt u m . Un U Le 314.1.1.4 ljlfilMUM TEMPERATURE FOR CRITICALITY

'This specification ensures that the reactor will not be made critical '

with the reactor coolant system average temperature less than 525*F.

This limitation is required to ensure (1) the moderator temperature coefficient is within its analyzed temperature range, (2) the protective instrumentation is within its normal operating range, (3) the pressurizer is capable of being in an OPERABLE status with a steam bubble, and (4) ,

the reactor pressure vessel is above its minimum RTm temperature.

3/4.1,2. BORATION SYSTEMS The boron injection system ensures that negative reactivity control is available during each mode of facility operation. The components required to perform this function include (1) borated water sources, (2) ma'keup or DHR pumps, (3) separate flow paths, (4) boric acid pumps, (5) associated heat tracing systems, and (6) an emergency power supply from  ;

operable emergency busses.

With the RCS average temperature above 200*F, a minimum of two separate '

and redundant boron injection systems are provided to ensure single functional capability in the event an assumed failure renders one of the systems inoperable. Allowable out-of-service periods ensure that minor component repair or corrective action may be completed without undue risk to overall facility safety from injection system failures during the repair period. With either the borated water storage tank (BWST) boron concentration or BWST borated water temperature not within limits, the condition must be corrected in eight hours. The eight hour limit to restore the temperature or boron concentration to within limits was developed considering the time required to change boron concentration or l temperature and assuming that the contents of the BWST are still available for injection.

The boration capability of either system is sufficient to provide a SHUTDOWN MARGIN from all operating conditions of 1.0% ok/k after xenon-decay and cooldown to 200*F. The maximum boration capability .

requirement occurs from full power equilibrium xenon conditions a'nd requires the equivalent of either 9071 gallons of 7875 ppm borated water from the boric acid addition system (BAAS) or 75,300 gallons of 2100 ppm borated water from the BWST.

The requirement for a minimum available volume of 482,778 gallons of -

borated water in the BWST ensures the capability for borating the RCS to l the desired level. The specified quantity of borated water is consistent with the ECCS requirements of Specification 3.5.4; therefore, the larger volume of borated water is specified.

With the RCS temperature below 200*F, one injection system is acceptable without single failure consideration on the basis of the stable reactivity condition cf the reactor and the additional restrictions prohibiting CORE ALTERATIONS and positive reactivity changes in the event j the single injection system becomes inoperable.

DAVIS-BES$f, UNif 1 B 3/4 1-2 Amendment No. )),)),

??, H. f), )l},101

, Docket Number ')O-346 License ilumber f1PF-3 Serial flumber 2249 e1 .[ tk bbk$

vf RfACllVITY CONIROL SYSTfMS ,, p.

meS dE dJu *^{ * '

l 310L] BORAT10N SYST2MS_1 Continued 1 l l

The boron capability required below 200*F is sufficient to provide a SilVIDOWt1 MARGIN of 1% Ak/k after xenon decay and cooldown from 200*F to l I

70*f. This condition requires either 700 gallons of 7875 ppm borated water from the BAAS or 3,000 gallons of 2100 ppm borated water from the BWST.

The bottom 4 inches of the BWST are not available, and the instrumen-tation is calibrated to reflect the available volume. All of the boric acid addition tank volume is available. The limits on water volume, and boron concentration ensure a pil value of between 7.0 and 11.0 of the.

solution recirculated within containment after a design basis accident.

The pil band minimizes the evolution of iodine and minimizes the effect of chloride and caustic stress corrosion cracking on mechanical systems and cdmponents.

The OPERABILITY of one boron injection system during REFUELING ensures that this system ir available for reactivity control while in MODE 6.

3/4.1,3 MOVABLE CONTROL ASSEMBilES The specifications of this section (1) ensure that acceptable power distribution limits are maintained, (2) ensure that the minimum SHUIDOWtf MARGIN is maintained, and (3) limit the potential effects of a rod ejection accident. OPERA 31LITY of the control rod position indicators is required to determine control rod positions and thereby ensure compliance with the control rod alignment and insertion limits.

The ACT10ft statements which permit limited variations from the basic requirements are accompanied by additional restrictions which ensure that the original criteria are met. for example, misalignment of a safety or regulating rod requires a restriction in TilERMAL POWER. The reactivity worth of a misaligned rod is limited for the remainder of the fuel cycle to prevent exceeding the assumptions used in the safety analysis.

The position of a rod declared inoperable due to misalignment should not be included in computing the average group position for determining the OPERABILITY of rods with lesser misalignments.

l l

Davis-BLSSE, UNir 1 B 3/4 1-3 Amendment flo. ii/3,191 1