ML20082P228

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Proposed,Revised Tech Spec 3/4.1.3 Re Movable Control Assemblies
ML20082P228
Person / Time
Site: Arkansas Nuclear Entergy icon.png
Issue date: 08/30/1991
From:
ENTERGY OPERATIONS, INC.
To:
Shared Package
ML20082P224 List:
References
NUDOCS 9109100244
Download: ML20082P228 (5)
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6 KEACTIVIT_Y__ CONTROL SYSTEMS 2/J01. 3 fiQYABLE CONTROL ASSEMBLIES CEA POSITJDy LDHlNLCOSDIURLIOLDEIRAUDN 3.1.3.1 All full length (shutdown and ragulating) CEAs, and all part length CEAr, which are inserted in the core, shall be OPERABLE with each CEA of a given group positioned within 7 inches (indicated position) of all other CEAs in its grc,up.

ArfLLCAll1L1H: MODES 1* and 2*.

ACTION:

n.

With one or more full length CEAs inoperable due to being immovable as a result of excessive friction or mechanical interference or known to be unt rippable, determine that the SilDTDOWN MARGIN requirement of Specification-3.1.1.1 is sntinfied within 1 bour and be in at least il0T STANDBY within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.

b, With one full length CEA t rippable but inoperable due to causes l

ot her t han addressed by ACTION a, above, and inserted beyond the Long Term Steady State Insertion Limits but'within its above specified. alignment requirements, operat ion in MODES I and 2 may continue pursuant to the requirements of Specification 3.1.3.6.

c.

With one full length-CEA trippable but inoperable due to causes l

other than addressed by_ ACTION a, above, but within its above specified alignment requirements and either fully withdrawn or within the Long Term Steady State Insertion Limits if in full length CEA group 6. operation MODES 1 and 2 may lontinue, d.

Wit h more than one full length or part length CEA trippable but inoperable due to causes other than addressed by ACTION a, above, restore the inoperable CEA(s) 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 il0T STANDBY within the next 6

hours, With one or more full length or part length CEAs trippablo but-c.

misaligned from any other CEAe in its group by,nore than 7 inches but less than or equal to 19 inches, operation in MODES 1 and 2 may continue, provided that core power is reduced in accordance with Figure 3.1-1A and within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> the misaligned CEA(s) is either:

1.

Restored to OPERABLE status within its above specified alignment requirements, or

  • See Special Test Exceptions 3.10.2 and 3.10.4.

ARKANSAS - UNIT 2 3/4 1-17 Amendment No. U.

9109100244 910830 PDR ADOCK 05000348

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ki;ACTlylT)LCONTKOI. SJSTliMS bCIIRS1__ E h1L11utt'd) 2.

Declared inoperable nint the SilV1DOWN MARGIN t equirement of Specificntion 3.1.1.1 is $nt is f ied.

Af ter declat ing the CEA inoperable, operation in MDDES 1 nnd 2 may continue pur sonnt t o the iequirement s of Specificat ion 3.1.3.6 provided:

a)

Within one hour the remainder of the CEAs in the group with the inopernble CEA shall be aligned to wit hin 7 inches of the inoperable CEA while maintaining t he allowable CEA sequence and insert ion g

limits shown on Figure 3.1-2; the TilEKMAL POWLK level h

shn11 be restricted pursunnt t o Spec i f ica t ion 3.1. 't. 6 during subsequent operntion, b) 1ho SilVTDOWN MARGIN requirement of Specificalion 3.1.1.1 is determined at lenst once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

Otherwise. be in at least Il0T STANDl4Y within t he next 6 hourt.

f.

With one full length or part length CEA trippnble but misaligned from any other CEA in it s group by more than 19 inches. operation in MODES 1 nnd 2 may continue, provided that tore pnwer is reduced in accordance with figure 3.1-1A and within one hour, the miuligned CEA is eit her :

1.

Kos t ored t o OPER ADLE stat us within str. nbove specified nlignment requirements. or Detinrod inoperable and the SilPIDOWN MAkGIN requitement of Specification 3.1.1.1 is natisfied.

After declaring the CEA innpernble, opet at ion in MODES 1 nnd 2 mny cont inue pursuant to the requirements of Specification 3.1.3.6 provided:

a)

Within one hour the remainder of the CEAs in t he group with the inoperable CEA r.hnll be nligned to within 7 inches of the inopernhin CEA while maintaining the allownble CEA sequence and insertion limits shown on Figure 3.1-2; the TilERMAL POWER level shn11 he restricted pursuant to Specification 3.1.3.6 during subsequent operation.

b)

The SilliTDOWN M ARGIN requirement of Speci ficat ion 3.1.1.1 is determined at leust onc.e per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

Otherwise. be in at least 110T STAND 11Y wit hin the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.

l AEKANSAS - UN]T 2 3/4 1-18 Amendment No. 70

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REACTIVITY CONTRpinSYSTE!!S AElIONt {Cofit iatied]

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With one part length CEA inoperable end Annerted in the core.

l operation may continue provided the alignment of the inoperable Pl.CEA is maintained within 7 inchen (indicated position) of all other PLCEAs in its group.

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With more t han-onc full length or part length CEA trippable but i

misaligned from any other CEA in its group by more than 19 i

inches (ftidicated position), be in at least 1101 STANI4Y within 6

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hourn.

_l EEVIlLLANCE.,AEQUIREMENTS_

j 4.).3.1.1.. The position of each full length and-part length CEA shall be determined to be within 7 inches (indicated pokition) of all other CEAs in its group at least once por 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />, i

4.1. 3.1. ' Each full length CEA not fally inserted and each part length

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LEA which 15 inserted in the core shall be determined to be OPEkABLE by j

movement of nt.- least 5 inches -in any one direction at least once por 31 j

days.

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i ARKANSAS - UNIT 2.

3/4 1-19' Amendment No. 10.

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Engimn c0NIROL smEMs i

MSES --

The boron capability required below 200'r 18 based upon providing a

% Ak/k SilVTDOWN MARGIN af ter xenon decay and cooldown f rom 200'r to 140'r.

This condit ton requires either borated water f rom the refueling l

water tank or boric acid solution from the boric acid makeup tank (s) in nccordance with the requirements of Specification 3.1.2.7.

The contained water volume limits includes allowanco for water not t

available because of discharge line location and other physical

- characteristics.

The 61.370 gallon limit for the refueling water tank is based upon hnving an indicated 1cvel in the tank of at least 7. n.

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The OPERAltiblTY of one boron injection system during REFL'ELING ensures that this system is nynilable f or react ivity control while in MODE 6.

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The limits on contained water volume and boron concentration of the RWT also ensure a pH value of between 8.8 and-11.0 for the solut ion r ecirculnt ed within cont ainment af t er a LOCA.

This pH band minimizes the evolution of iodine and minimizes the effect of chloride snd caustic stre n-torronton on mechnnical systems and components.

J 3Ihla__1103APLt IMIhulcASELMidLS The specifications of this section ensure that (1) acceptable power.

l dist ribut ion limits are maintained, (2) the minimum SllVTDOWN MARGIN is

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maintained, and (3) the potentini effects of CEA misalignments are limited-t to acceptable levels.

1 The ACTION statements which permit limited variations from the basic f

requirements are accompnnled by additional restrictions which ensure that

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the original design criterin are met.

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i The ACTION statements applienble to a stuck or untrippable CEA or a i

Intge misalignment (2 in inches) of two or more CEAs, require a prompt shutdnwn of the t eactor $1nce either of these conditions may be indientive j

of a possible lon of mechanical functional capability of the CEAs and in j

the event of a st uck or unt rippable CEA, the loss of SHUTDOWN MARGIN.

CEAs that are confirmed to be inoperable due to problems other than f

addressed by ACTION a of Specification ').l.3.1 will not impact SilVTDOWN l

MARGIN as long as their relative positions satisfy the applicable i

n?ignment requirements.

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for sen11 misalignmentn (( 19 inches) of the CEAs, there is 1) a su ll effect on-the time dependent long term power dihtributions relative

- to those used in generat ing LCOs and LSSS setpoint s. 2) a small effect on

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the avnflable SHUTDOWN MARGIN, and 3) a small ef fect on the ejected CEA worth used in the safety analysis.

Therefore, the ACTION I

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t AkKANSAS - UNIT 2 B 3/4 1-3 Amendment No. /J, f /..

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statement associated with trippable but small misalignments of CEAs permits a one hour time interval during which attempts may be made to restore the CEA to within its alignment requirements.

The one hour time ilmit is sufficient to (1) identify causes of a misaligned CEA, (2) take appropriate corrective action to realign the CEAs and (3) minimize the cffects of xenon redistribution. problems may also cause more than one control rod to be irnmovable where the cont rol rods continue to bc trippable. With trippable but multiple inoperable rod,; the alignment I

limits and the restriction on THERMAL POWER in accordance with the l

provisions-of Specification 3.1.3.6 for insertion limits, assures fuel rod j

integrity during continued operation.

These provisions are sufficient to allow 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> to restore the inoperable rods to operable status when it

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is confirrned that the cause of the irnmovnble rods is an electrical problem in the rod cont rol system or an elect rical or mechanical problem with the l

rod stepping rechanism exclusive of the rod holding coil that must function for a reactor trip.

In such cases, the control rods will i

continue to be capable of fulfilling their primary safety function.

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1he OpCs provide protection to the cc.e in the event of a large misalignment (? 19 inches) of a CEA by applying appropriate penalty i

factors to the cniculation to account for the misaligned CEA.

However, this misalignment would cause distortion of the core power distribution, j

T h i e, distribution may, in turn, have a significant ef fect on 1) the available SHUTDOWN MARGINS 2) the t ime dependent long term power i

distributtons relative to those used in generating LCOs and LSSS i

setpoints, and 3) the ejected CEA worth used in the safety analysis.

Therefore, the ACTION statement associated with the large misalignment of i

a CEA requires a prompt realignment of_the misaligned CEA.

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The ACT30N statements applicable to trippable but misaligned or l

inopeinble CEAs include requirements to align the OPERABLE CEAs in a given group with the inoperable CEA.

Conformance with these alignment requirements brings the core, within a short period of time, to a i

configuration consistent with that assumed in generating LCO and LSSS set points. - llowever, extended operation with CEAs significantly inserted

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in the core may lead to perturbations in 1) local burnup, 2) peaking i

- factors and 3) available SHUTDOWN HARGIN which are more adverse than the

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conditions assumed to exist in the safety analyses and LCO and LSSS setpoints determination.

Therefore, time limits have been imposed on operation with inoperable CEAs to preclude such adverse conditions from developing.

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Operability of at least two CEA position indicator channels is required to determine CEA positions and thereby ensure compliance with the CEA alignrnent and insertion limits.

The CEA " Full In" and " Full Out" l

limits provide an additional indepandent means for determining the CEA l

positions when the CEAs are at either their fully inserted or fu'ly withdrawn positions.

Therefore, the ACTION statements applicable to

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inoperable CEA position indicators permit continued operations when the i

positions of CEAs with inoperable position indicators can be verified by the " Full In" or " Full Out" limit s.

i AREANSAS. UNIT 2 B 3/4 1-4

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