ML20055A295

Proposed Revisions to Tech Spec Sections 3.1.3.6,4.1.3.6, 3.1.3.7,4.1.3.7,3/4.1.3,3.10.2 & 4.10.2.1 Re Regulation & Part Length Control Element Assembly Insertion Limits

ML20055A295
Person / Time
Site:	Arkansas Nuclear
Issue date:	07/08/1982
From:	ARKANSAS POWER & LIGHT CO.
To:
Shared Package
ML20055A294	List: 2CAN078203, Application to Amend License NPF-6,changing Tech Specs Re Regulation & Part Length Control Element Assembly Insertion Limits.W/Class III Amend Fee ML20055A295
References
NUDOCS 8207160095
Download: ML20055A295 (9)

Text

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REACTIVITY CONTROL SYSTEMS REGULATING CEA INSERTION LIMITS LIMITING CONDITION FOR OPERATION 3.1.3.6 The regulating CEA groups shall be limited to the withdrawal sequence and to the insertion limits shown on Figure 3.1-2 with:

a. CEA insertion between the Long Term Steady State Insertion Limit and the Transient Insertion Limit restricted to:

1. < 5 Effective Full Power Days per 30 Effective Full Power Day intervals, and

2. 1 14 Effective Full Power Days per calendar year.

b. CEA insertion between the Short Term Steady State Insertion Limit and the Transient Insertion Limit shall be restricted to 1 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> per 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> interval.

APPLICABILITY: MODES 1* and 2*#.

ACTION:

a. With the regulating CEA groups inserted beyond the Transient Insertion Limit, except for surveillance testing pursuant to Specification 4.1.3.1.2, within two hours either:

1. Restore the regulating CEA groups to within the limits, or

2. Reduce THERMAL POWER to less than or egual to that fraction of RATED THERMAL POWER which is allowed by the CEA group position using the above figure.

b. With the regulating CEA groups inserted between the Long Term Steady State Insertion Limit and the Transient Insertion Limit for intervals >5 EFPD per 30 EFPD interval or >14 EFPD per calendar year, either:

1. Restore the regulating groups to within the Long Term Steady State Insertion Limit within two hours, or

2. Be in at least HOT STANDBY within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.

• See Special Test Exceptions 3.10.2 and 3.10.4

1. With Keff >1.0

{ ARKANSAS - UNIT 2 3/4 1-25 _

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c. With the regulating CEA grou)s inserted between the Short Term Steady State Insertion Limit and the Transient Insertion Limit for intervals >4 hours'per 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> interval,, operation may proceed provided any subsequent increase in thermal power is restricted to < 5% of rated thermal power per hour.

SURVEILLANCE REQUIREMENTS 4.1.3.6 The aosition of each regulating CEA group shall be determined to be within tie Transient Insertion Limit at least once per 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />s-except during time intervals when the PDIL Alarm is inoperable, then verify the individual CEA )ositions at least once per 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />. The accumulated times during w1ich the regulating CEA grou)s are inserted beyond the Long Term Steady State Insertion Limit or tie Short Term Steady State Insertion Limit but within the Transient Insertion Limit shall be determined at least once per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

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1 ARKANSAS - UNIT 2 3/4 1-27 l

REACTIVITY CONTROL SYSTEMS PART LENGTH CEA INSERTION LIMITS LIMITING CONDITION FOR OPERATION 3.1.3.7 The part length CEA grou) shall be limited to the insertion limits shown on Figure 3.1-3 with )LCEA insertion between the Long Term Steady State Insertion Limit and the Transient Insertion Limit restricted to:

a. < 5 Effective Full Power Days per 30 Effective Full Power Day interval, and b.. < 14 Effective Full Power Days per calendar year.

APPLICABILITY: MODES 1*

ACTION:

a. With the part length CEA groups inserted beyond the Transient Insertion Limit, except for surveillance testing pursuant to Specification 4.1.3.1.2, within two hours either:

1. Restore the part length CEA group to within the limits, or

2. Reduce THERMAL POWER to less than or egual to that fraction of RATED THERMAL POWER which is allowed by the PLCEA group position using figure, 3.1-3.

b. With the part length CEA groups inserted between the Long Term Steady State Insertion Limit and the Transient Insertion Limit for intervals >5 EFPD per 30 EFPD interval or >14 EFPD per calendar year, either:

1. Restore the part length group to within the Long Term Steady State Insertion Limits within two hours, or

2. Be in at least H0T STANDBY within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.

SURVEILLANCE REQUIREMENTS 4.1.3.7 The )osition of the part length CEA group shall be determined to be within tie Transient Insertion Limit at least once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

The accumulated time during which the part length CEA group is inserted beyond the Long Term Steady State Insertion Limit but within the Transient Insertion Limit shall be determined at least once per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

• See Special Test Exception 3.10.2 ARKANSAS - UNIT 2 3/4 1-28

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ARKANSAS - UNIT 2 3/4 1-29 ,

REACTIVITY CONTROL SYSTEMS BASES The boron capability required below 200 F is based upon providing a 5%

Ak/k SHUTDOWN MARGIN after xenon decay and cooldown from 200 F to 140 F.

This condition requires either 8185 gallons of 1731 ppm borated water from the refueling water tank or boric acid solution from the boric acid makeup tanks in accordance with the requirements of Specification 3.1.2.7.

The contained water volume limits include allowances for water not available because of discharge line location and other physical characteristics. The 32 250 gallon limit for the refueling water tank is based upon having an indicated level in the tank of at least 2%.

TheOPERABILITYofonebaroninjectionsystemduringREFUELINGensures that this system is available for reactivity control while in MODE 6.

The limits on contained water volume and boron concentration of the RWT also ensure a pH value of between 8.9 and 11.0 for the solution recirculated within containment after a LOCA. This pH band minimizes the evolution of iodine and minimizes the effect of chloride and caustic stress corrosion on mechanical systems and components.

3/4.1.3 MOVABLE CONTROL ASSEMBLIES The specifications of this section ensure that (1) acceptable power distribution limits are maintained, (2) the minimum SHUTOOWN MARGIN is maintained, and (3) the potential effects of CEA misalignments are limited to acceptable levels.

The ACTION statements which permit limited variations from the basic requirements are accompanied by additional restrictions which ensure that the original design criteria are met.

The ACTION statements applicable to a stuck or untrippable CEA, to two or more inoperable CEAs, and to a large misalignment () 19 inches) of two or more CEAs, require a prompt shutdown of the reactor since any of these conditions may be indicative of a possible loss of mechanical functional capability of the CEAs and in the event of a stuck or untrippable CEA, the loss of SHUTDOWN MARGIN.

For small misalignments (<19 inches) of the CEAs, there is 1) a small effect on the time dependent long term power distributions relative to those used in generating LCOs and LSSS setpoints, 2) a small effect on theavailableSHUTDOWNMARGIN,and3)asmalleffectontheejectedCEA worth used in the safety analysis. Therefore the ACTION statement associated with 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 limit is sufficient to (1) identify causes of a misaligned CEA, (2) take appropriate corrective action to realign the CEAs and (3) minimize the effects of xenon redistribution.

ARKANSA; - UNIT 2 B 3/4 1-3

____A

The CPCs provided protection to the core in the event of a large misalignment (> 19 inches) of a CEA by applying appropriate penalty factors to the~ calculation to account for the misaligned CEA. However this misalignment would cause distortion of the core power distribution.

This distribution may, in turn, have a significant effect on 1) the available SHUTDOWN MARGIN, 2) the time dependent long term power distributions relative to those used in generating LCOs and LSSS setpoints,and3)theejectedCEAworthusedinthesafetyanalysis.

Therefore, a CEA requ ires a prompt realignment of the misaligned CEA.the ACTION stat The ACTION statements a)plicable to misaligned or inoperable CEAs include requirements to align tie OPERABLE CEAs in a given group with the inoperable CEA. Conformance with these alignment reguirements brings the core, within a short period of time, to a configuration consistent with that assumed in generating LC0 and LSSS setpoints. However extended operationwithCEAssignificantlyinsertedinthecoremay)leadto local burnup, 2) peaking factors and 3 available perturbationsin1)haremoreadversethantheconditionsassumedto SHUT 00WN MARGIN whic exist in the safety analyses and LC0 and LSSS setpoints determination.

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

Operability of at least two CEA losition indicator channels is required todetermineCEApositionsandtierebyensurecomgliancewiththeCEA alignment and insertion limits. The CEA " Full In and " Full Out" limits provide an additional independent means for determining the CEA positions when the CEAs are at either their fully inserted or fully withdrawn position. Therefore, the action statements applicable to inoperable CEA position indicators permit continued operations when the aositions of CEAs with inoperable position indicators can be verified )y the " Full IN" or " Full Out" limits.

1 ARKANSAS - UNIT 2 8 3/4 1-4

l j REACTIVITY CONTROL SYSTEMS BASES:

CEA positions and OPERABILITY of the CEA position indicators are required to be verified on a nominal basis of once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> with more frequent verifications required if an automatic monitoring channel is inoperable.

These verification frequencies are adequate for assuring that the applicable LC0's are satisfied.

The maximum CEA dro) time restriction is consistent with the assumed CEA drop time used in tie accident analyses. Measurement with T 525 F and with all reactor coolant pumps operating ensures that th8VMe>asured drop times will be representative of insertion times experienced during a reactor trip at operating condition.

The establishment of LSSS and LCOs require that the expected long and short term behavior of the radial peaking factors be determined. The long term behavior relates to the variation of the steady state radial peaking factors with core burnup and is affected by the amount of CEA insertion assumed, the portion of a burnup cycle over which such insertion is assumed and the expected power level variation throughout the cycle. The short term behavior relates to transient perturbations to the steady-state radial peaks due to radial xenon redistribution. The magnitudes of such perturbations depend upon the expected use of the CEAs during anticipated power reductions and load maneuvering. Analyses are performed based on the expected mode of operation of the NSSS (base load, load followinc etc.) and from these analyses CEA insertions are determined anc a consistent set of radial peaking factors are defined.

The Long Term Steady State and Short Term Insertion Limits are determined based upon the assumed mode of operation used in the analyses and provide a means of preserving the behavior of the radial peaking factors within the bounds determined from analysis. The actions specified serve to limit the extent of radial xenon redistribution effects to those accomodated in the analyses. The Long and Short Term Insertion Limits of Specification 3.1.3.6 and 3.1.3.7 are specified for the plant which has been designed for primarily base loaded operation but which has the ability to accomodate a limited amount of load maneuvering.

The Transient Insertion Limits of Specification 3.1.3.6 and the Shutdown CEA Insertion Limit of Specification 3.1.3.5 ensure that 1) the minimum SHUTDOWN MARGIN is maintained, and 2) the potential effects of a CEA ejectionaccidentarelimitedtoacceptablelevels. Long term operation at the Transient Insertion Limits is not permitted since such operation could have effects on the core lower distribution which could invalidate assumptions used to determine tie behavior of the radial peaking factors.

ARKANSAS - UNIT 2 B 3/4 1-5

_ _ _ _ .. .. - -. . .. _u

SPECIAL TEST EXCEPTIONS GROUP HEIGHT, INSERTION AND POWER DISTRIBUTION LIMITS LIMITING CONDITION FOR OPERATION 3.10.2 The group height insertion and power distribution limits of Specifications 3.1.1.4 5.1.3.1 3.1.3.5, 3.1.3.6, 3.1.3.7, 3.2.2, 3.2.3 3.2.7andtheMinimumEhannels6PERABLErequirementofFunctionalUnit1$

of Table 3.3-1 may be suspended during the performance of PHYSICS TESTS provided:

a. The THERMAL POWER is restricted to the test power plateau which shall not exceed 85% of RATED THERMAL POWER, and

b. The limits of Specification 3.2.1 are maintained and determined as specified in Specification 4.10.2.2 below.

APPLICABILITY: During startup and PHYSICS TESTS.

ACTION:

With any of the limits of Specification 3.2.1 being exceeded while any of the above requirements suspended, either:

a. Reduce THERMAL POWER sufficiently to satisfy the requirements of Specification 3.2.1, or

b. Be in HOT STANDBY within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.

SURVEILLANCE REQUIREMENTS 1

4.10.2.1 The THERMAL POWER shall be determined at least once per hour

during PHYSICS TESTS in which any of the above requirements are suspended and shall be verified to be within the test power plateau.

4.10.2.2 The linear heat rate shall be determined to be within the limits of Specification 3.2.1 by monitoring it continuously with the Incore Detector Monitoring System pursuant to the requirements of Saecification 4.2.1.3 and 3.3.3.2 during PHYSICS TESTS above 5% of RATED TiERMAL POWER in which any of the above requirements are suspended.

ARKANSAS - UNIT 2 3/4 10-2