Text

Forwards Tech Specs Pages from 861001 CEA Misalignment Amend Request & 870206 Unit 2 Cycle 8 Reload Amend Request,Per SA Mcneil Request
	ML20206S185
Person / Time
Site:	Calvert Cliffs
Issue date:	04/17/1987
From:	Bowman M; BALTIMORE GAS & ELECTRIC CO.
To:	; NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
	NUDOCS 8704220351
	Download: ML20206S185 (18)
	v • d • e

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er" BALTIMORE OAS AND ELECTRIC CHARLES CENTER. P.O. BOX 1475 BALTIMORE, MARYLAND 21203 NUCLEAR ENGINEERING SERVICES DEPARTMENT CALVERT CLIFFS NUCLEAR POWER PLANT LUSBY. MARYLAND 20657 April 17,1987 U. S. Nuclear Regulatory Commission Washington, DC 20555 ATTENTION:

Document Control Desk

SUBJECT:

Calvert Cliffs Nuclear Power Plant Unit Nos.1 & 2; Docket Nos. 50-317 & 50-318 Transmittal of Technical Specification Pages for inclusion in CEA Misalignment Amendment Request and Unit 2 Cycle 8 Reload License Amendment Request

REFERENCES:

(a)

Letter from Mr. 3. A. Tiernan (BG&E) to NRC, dated February 6,1987, Calvert Cliffs Nuclear Power Plant, Unit No. 2; Docket No. 50-318, Request for Amendment, Eighth Cycle License Application (b)

Letter from Mr. 3. A. Tiernan (BG&E) to Mr. A. C. Thadani (NRC), dated October 1,1986, Calvert Cliffs Nuclear Power Plant, Unit Nos.1 & 2; Docket Nos. 50-317 & 50-318, Request for Amendment Gentlemen:

Enclosed are two copies of the Technical Specification pages requested by Mr. S. A. McNeil of your staff, as submitted in References (a) and (b).

Very truly yours, M. E. Bowman General Supervisor Technical Services Engineering MEB/DSE/Imt Enclosures

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Document'Contrcl Desk April 17,1987.

Page 2 cc:

D. A. Brune, Esquire

3. E. Silberg, Esquire R.'A. Capra, NRC S. A. McNeil, NRC

3. M. Allen, NRC T. Foley/D. A. Trimble, NRC

I l

l l

(0,1.20) 1.20 UNACCEPTABLE UNACCEPTABLE OPERATION OPERATION REGION REGION 1.10 5y 1.00

(-0.2,1.00)

(0.2,1.00)

N=5 5

8 0.90 I

Ei ACCEPTABLE z

OPERATION 3

REGION y

0.80 E

(-0.4,.70)

(0.4,.70) 0.70 0.60 0.50

-0.6

-0.4

-0.2 0

0.2 0.4 0.6 PERIPHERAL AXIAL SHAPE INDEX, Y i

Figure 2.2-1 Peripheral Axial Shape Index, Yi vs Fraction of Rated Thermal Power CALVERT CLIFFS - UNIT 2 2-11 Amendment No. 61,

3/4.1 REACTIVITY CONTROL SYSTENIS 3 /4.1.1 BORATION CONTROL SHUTDOWN MARGIN -

T,,,m

> 2000F LINilTING CONDITION FOR OPERATION 3.1.1.1 The SHUTDOWN MARGIN shall be a 4.5%'d k/k.

l APPLICABILITY: MODES 1, 2**, 3 and 4.

ACTION:

With the SIIUTDOWN MARGIN < 4.5%* 6 k/k, immediately initiate and continue l

boration at 1 40 gpm of 2300 ppm boric acid solution or equivalent until the required SIIUTDOWN MARGIN is restored.

SURVEILLANCE REOUIREMENTS 4.1.1.1.1 The SIIUTDOWN MARGIN shall be determined to be t 4.5%* 4 k/k:

l a.

Within one hour after detection of an inoperable CEA(s) and at least once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months thereafter while the CEA(s) is inoperable.

If the inoperable CEA is immovable or untrippable, the above required SilUTDOWN MARGIN shall be increased by an amount at least equal to the withdrawn worth of the immovable or untrippable CEA(s).

b.

When in MODES 1 or 2#, at least once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months by verifying that CEA group withdrawal is within the Transient Insertion Limits of Specification 3.1.3.6.

When in MODE 2##, within 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months prior to achieving reactor criticality c.

by verifying that the predicted critical CEA position is within the limits of Specification 3.1.3.6.

d.

Prior to initial operation above 5% RATED TIIERMAL POWER after each fuel loading, by consideration of the factors of e below, with the CEA groups at the Transient Insertion Limits of Specification 3.1.3.6.

Adherence to Technical Specification 3.1.3.6 as specified in Surveillance Requirements 4.1.1.1.1 assures that there i* sufficient available shutdown margin to match the shutdown margin requirements of the safety analyses.

See Special Test Exception 3.10.1.

i With Kerr 1 1.0.

With Kerr <

l.0.

CALVERT CLIFFS - UNIT 2 3/4 1-1 Amendment No. 90, 1

F REACTIVITY CONTROL SYSTEM MODERATOR TEMPERATURE COEFFICIENT LIMITING CONDITION FOR OPERATION 3.1.1.4 The moderator temperature coefficient (MTC) shall be:

a.

Less positive than the limit line of Figure 3.1-la, and b.

Less negative than -2.7 x 10-4 d k/k/0F at RATED TIIERMAL POWER.

APPL!CABILITY: MODES I and 2**

ACTION:

With the moderator temperature coefficient outside any one of the above limits, be in at least IIOT STANDBY within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months .

SURVEILLANCE REOUIREMENTS 4.1.1.4.1 The MTC shall be determined to be within its limits by confirmatory measurements. MTC measured values shall be extrapolated and/or compensated to permit direct comparison with the above limits.

i With Kerr a 1.0.

See Special Test Exception 3.10.2.

1 CALVERT CLIFFS - UNIT 2 3/4 1-5 Amendment No. 90,

9

1. 8 G9 p

8. e M

2 8

8. 8 UNACCEPTABLE OPERATION REGION b

POSITIVE MTC LIMIT LINE f(8.7. 8.7) -

8. 7 u.

a

8. 8

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8. 5

3 ACCEPTABLE OPERATION REGION rex

8. 4 5p (1 8 8 3)

8. 3 ia g

8. 2

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8. 8 8.1

8. 2

8. 3

8. 4

8. 5

8. 6

8. 7

8. 8

8. 9

1. 8 1.1 FRACTION OF RATED THERMAL POWER F1aur. 3.1-la

(~

3/4.1 REACTIVITY CONTROL SYSTEMS BASES 3 /4.1.1 BORATION CONTROL 3/4.I.1.1 AND 3/4.1.1.2 SHUTDOWN MARGIN A sufficient SHUTDOWN MARGIN ensures that 1) the reactor can be made suberitical from all operating conditions, 2) the reactivity transients associated with postulated accident conditions are controllable within acceptable limits, and

3) the reactor will be maintained sufficiently subcritical to preclude inadvertent criticality in the shutdown condition.

SIIUTDOWN MARGIN requiremenu vary throughout core life as a function of fuel depletion, RCS boron concentration, and RCS Tayg.

The minimum available SIIUTDOWN MARGIN for no load operating conditions at beginning of life is 3.5% o k/k and at end of life is 4.5% 4 k/k. The SHUTDOWN MARGIN l

is based on the safety analyses performed for a steam line rupture event initiated at no load conditions. The most restrictive steam line event occurs at EOC conditions.

For the steam line rupture event at beginning of cycle conditions, a minimum SilUTDOWN MARGIN of less than 3.5% d k/k is required to control the reactivity transient, and end of cycle conditions require 4.5% d k/k. Accordingly, the SilUTDOWN MARGIN requirement is ba cd upon l

this limiting condition and is consistent with FSAR safety analysis assumptions.

With Tavg s 2000F, the reactivity transients resulting from any postulated accident are minimal and a 3% 6 k/k shutdown margin provides adequate protection.

With the pressurizer level less than 90 inches, the sources of non-borated water are restricted. to increase the time to criticality during a boron dilution event.

3/4.1.1.3 BORON DILUTION A minimum flow rate of at least 3000 GPM provides adequate mixing, prevents stratification and ensures that reactivity changes will be gradual during boron concentration reductions in the Reactor Coolant System.

A flow rate of at least 3000 GPM will circulate an equivalent Reactor Coolant System volume of 9,601 cubic feet in approximately 24 minutes. The reactivity change rate associated with boron concentration reductions will therefore be within the

)

capability of operator recognition and control.

3/4.1.1.4 MODERATOR TEMPER ATURE COEFFICIENT (MTC)

The limitations on MTC are provided to ensure that the assumptions used in the accident and transient analyses remain valid through each fuel cycle.

The surveillance requirements for measurement of the MTC during the fuel cycle are adequate to confirm the MTC value since this coefficient changes slowly due principally to the reduction in RCS baron concentration associated with fuel burnup.

The confirmation that the measured MTC v:!ue is within its limit provides assurances that the coefficient will be maintained within acceptable i

values throughout each fuel cycle.

l CALVERT CLIFFS - UNIT 2 B 3/4 l-l Amendment No. 90, J

F REACTIVITY CONTROL SYSTENfS

^

3/4.1.3 MOVABLE CONTROL ASSEMBLIES LIhflTING CONDITION FOR OPERATION 3.1.3.1 The CEA Motion Inhibit and all shutdown and regulating CEAs shall be l

OPERABLE with each CEA of a given group positioned within 7.5 inches (indicated position) of all other CEAs in its group.

APPLICABILITY: htODES l' and 2*

ACTION:

a.

With one or more CEAs inoperable due to being immovable as a result l

of excessive friction or mechanical interference or known to be untrippable, be in at least IIOT STANDBY within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months , b.

With the CEA hiotion inhibit inoperable, within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months either:

1.

Restore the CEA hiotion Inhibit to OPERABLE status, or 2.

Place and maintain the CEA drive system mode switch in either the "Off" or any "Nianual hiode" position and fully withdraw all CEAs in groups 3 and 4 and withdraw the CEAs in group 5 to less than 5% insertion, or 3.

De in at least IIOT STANDBY.

c.

With one CEA inoperable due to causes other than addressed

by l

ACTION a, above, and inserted beyond the Long Term Steady State Insertion Limits but within its above specified alignment requirements, operation in blODES I and 2 may continue for up to 7 days per occurrence with a total accumulated time of s 14 days per calendar

year, d.

With one CEA inoperable due to causes 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 CEA group 5, operation in blODES I and 2 may continue.

See Special Test Exceptions 3.10.2 and 3.10.4.

CALVERT CLIFFS - UNIT l 3/4 1-17 Amendment No.

r REACTIVITY CONTROL SYSTEMS LIMITING CONDITION FOR OPERATION e.

With one or more CEAs misaligned from any other CEAs in its group l

by more than 7.5 inches but less than 15 inches, operation in MODES I and 2 may continue, provided that within one hour the misaligned CEA(s) is either:

1.

Restored to OPERABLE status within its above specified alignment requirements, or 2.

Declared inoperable.

After declaring the CEA inoperable, operation in MODES I and 2 may continue for up to 7 days per occurrence with a total accumulated time of s 14 days per calendar year provided all of the following conditions are met:

a.

The TIIERSIAL POWER level shall be reduced to s 70% of the maximum allowable TIIERSIAL POWER IcVel for the existing Reactor Coolant Pump combination within one hour; if negative reactivity insertion is required to reduce tiler 5fAL POWER, boration shall be used.

b.

Within one hour after reducing the TIIERMAL POWER as required by a) above, the remainder of the CEAs in the group with the inoperable CEA shall be aligned to within 7.5 inches of the inoperable CEA while maintaining the allowable CEA sequence and insertion limits shown on Figure 3.1-2; the TIIERMAL POWER level shall be restricted pursuant to Specification 3.1.3.6 during subsequent operation.

1 f.

With one CEA misaligned from any other CEA in its group by 15 inches I

or more, operation in MODES I and 2 may continue, provided that the misaligned CEA is positioned within 7.5 inches of the other CEAs in its group in accordance with the time allowarce shown in Figure 3.1-3.

The pre-misaligned F7 value used to determine the allowable time to realign the CEA from Figure 3.1-3 shall be the latest measurement taken within 5

days prior to the CEA misalignment.

if no measurements were taken within 5 days prior to the misalignment, a pre-misaligned F[of 1.65 shall be assumed.

g.

With one CEA misaligned from any other CEA in its group by 15 inches or more at the conclusion of the time allowance permitted in Figure 3.1-3, immediately start to implement the following actions:

1.

If the TIIERMAL POWER level prior to the misalignment was greater than 50% of RATED TIIERMAL POWER, TIIERMAL POWER shall be reduced to less than the greater of:

CALVERT CLIFFS - UNIT I 3/4 l-18 Amendment No.

r REACTIVITY CONTROL SYSTENIS LINilTING CONDITION FOR OPERATION a) 50% of RATED THER5fAL POWER b) 75% of the THER5tAL POWER level prior to the misalignment within one hour after exceeding the time allowance permitted by Figure 3.1-3.

2.

If the THER5tAL POWER level prior to the misalignment was less than 50% of RATED THER5tAL POWER, maintain THER5tAL POWER no higher than the value prior to the misalignment.

1 If negative reactivity insertion is required to reduce THER5tAL POWER, boration shall be used. Within one hour after establishing the appropriate THER5tAL POWER as required above, either:

1.

Restore the CEA to within the above specified alignment requirements, or 2.

Declare the CEA inoperable.

After declaring the CEA inoperable, POWER OPERATION may continue for up to 7 days per occurrence j

with a total accumulated time of s 14 days per calendar year l

provided the remainder of the CEAs in the group with the I

inoperable CEA are aligned to within 7.5 inches of the inoperable CEA while maintaining the allowable CEA sequence and insertion limits shown on Figure 3.1-2; the THER5tAL POWER level shall be l

restricted pursuant to Specification 3.1.3.6 during subsequent operation.

h.

With more than one CEA inoperable or misaligned from any other CEA l

In its group by 15 inches (indicated position) or more, be in at least IlOT STANDBY within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months , l

1.

For the purposes of performing the CEA operability test of TS l

4.1.3.1.2, if the CEA has an inoperable position indication channel, the alternate indication system (pulse counter or voltage dividing network) will be used to monitor position.

If a direct position indication (full out reed switch or voltage dividing network) cannot be restored within ten minutes from the commencement of CEA motion, or CEA withdrawal exceeds the surveillance testing insertion by > 7.5 inches, the position of the CEA shall be assumed to have been > 15 i

inches from its group at the commencement of CEA motion.

I 1

1 O

i 1

CALVERT CLIFFS - UNIT I 3/4 l-19 Amendment No. 28, 84, J

i 8

1

F REACTIVITY CONTROL SYSTEMS SURVEILLANCE ItEOUIREMENTS 4.1.3.1.1 The position of each CEA shall be determined to be within 7.5 inches l

(indicated position) of all other CEAs in its group at least once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months except during time intervals when the Deviation Circuit and/or CEA Motion Inhibit are inoperable, then verify the individual CEA positions at least once per 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months .

4.1.3.1.2 Each CEA not fully inserted shall be determined to be OPERABLE by inserting it at least 7.51,nches at least once per 31 days.

l 4.1.3.1.3 The CEA Motion Inhibit shall be demonstrated OPERABLE at least once per 31 days by a functional test which verifies that the circuit maintains the CEA group overlap and sequencing requirements of Specification 3.1.3.6 and that the circuit also prevents any CEA from being misaligned from all other CEAs in its group by more than 7.5 inches (indicated position).

l l

CALVERT CLIFFS - UNIT I 3/4 1-19A Amendment No. 28, 84, l

REACTIVITY CONTROL SYSTEMS BASES Overpower margin is provided to protect the core in the event of a large misalignment ( h 15 inches) of a CEA. However, this misalignment would cause distortion of the core power distribution. The reactor protective system would not detect the degradation in radial peaking factors and since variations in other system parameters (e.g., pressure and coolant temperature) may not be sufficient to cause trips, it is possible that the reactor could be operating with l

process variables less conservative than those assumed in generating LCO and LSSS setpoints.

The ACTION statement associated with a large CEA misalignment requires prompt action to realign the CEA to avoid excessive margin degradation, if the CEA is not realigned within the given time constraints, action is specified which will preserve margin, including reductions in TIIERMAL POWER.

For a single CEA misalignment, the time allowance to realign the CEA (Figure 3.1-3) is permitted for the following reasons:

1.

The margin calculations which support the power distribution LCOs for DNDR are based on a steady-state F[ as specified in Technical Specification 3.2.3.

2.

When the actual F[ is less than the Technical Specification value, additional margin exists.

3.

This additional margin can be credited to offset the increase in F[

with time that will occur following a CEA misalignment due to xenon redistribution.

The requirement to reduce power level after the time limit of Figure 3.'l-3 is reached offsets the continuing increase in F[ that can occur due to xenon redistribution. A power reduction is not required below 50% power. Below 50%

power there is sufficient conservatism in the DNB power distribution LCOs to completely offset any, or any additional, xenon redistribution effects.

i The ACTION statements applicable to misaligned or inoperable CEAs include requirements to align the OPERABLE CEAs in a given group with the inoperable CEA. Conformance with these alignment requirements bring the core, within a short period of time, to a configuration consistent with that assumed in generating LCO and LSSS setpoints.

Ilowever, extended operation with CEAs significantly inserted in the core may lead to perturbations in 1) local burnup,

2) peaking factors, and 3) available shutdown margin which are more adverse than the 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, i

CALVERT CLIFFS - UNIT I B 3/4 1-4 Amendment No. 84, 90,

REACTIVITY CONTROL SYSTEMS BASES Operability of the CEA position indicators is required to determine CEA positions and thereby ensure compliance with the CEA alignment and insertion limits and ensures proper operation of the rod block circuit. 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 positions.

Therefore, the OPERABILITY and the ACTION statements applicable to inoperable CEA position indicators permit continued operations when positions of CEAs with inoperable indicators can be verified by the " Full In" or " Full Ost" limits.

CEA positions and OPERABILITY of the CEA position indicators are i

required to be verified on a nominal basis of once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months with more l

frequent verifications required if an automatic monitoring channel is inoperable.

These verification frequencies are adequate for assuring that the applicable 1

LCOs are satisfied.

The surveillance requirements affecting CEAs with inoperable position indication channels allow 10 minutes for testing each affected CEA. This time limit vas selected so that 1) the time would be long enough for the required testing, and 2) if all position indication were lost during testing, the time would be short enough to allow a power reduction to 70% of maximum allowable thermal power within one hour from when the testing was initiated. The time limit ensures CEA misalignments occurring during CEA testing are corrected within the time requirements required by existing specifications.

l CALVERT CLIFFS - UNIT I B 3/4 1-4A Amendment No.

I l

REACTIVITY CONTROL SYSTEMS 3/4.1.3 N10VADLE CONTROL ASSEMBLIES LIMITING CONDITION FOR OPERATION l

3.1.3.1 The CEA hiotion Inhibit and all shutdown and regulating CEAs shall be OPERABLE with each CEA of a given group positioned within 7.5 inches (indicated position) of all other CEAs in its group.

APPLICABILITY: n10 DES 1* and 2*

ACTION:

a.

With one or more CEAs inoperable due to being immovable as a result of excessive friction or mechanical interference or known to be untrippable, be in at least IIOT STANDBY within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months .

b.

With the CEA hiotion Inhibit inoperable, within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months either:

i 1.

Restore the CEA hiotion Inhibit to OPERABLE status, or 2.

Place and maintain the CEA drive system mode switch in either the "Off" or any " Manual Mode" position and fully withdraw all CEAs in groups 3 and 4 and withdraw the CEAs in group 5 to less than 5% insertion, or 3.

De in at least IIOT STANDBY.

c.

With one CEA inoperable due to causes other than addressed

by ACTION a, above, and inserted beyond the Long Term Steady State Insertion Limits but within its above specified alignment requirements, operation in blODES I and 2 may continue for up to 7 days per 1

occurrence with a total accumulated time of s 14 days per calendar year.

d.

With one CEA inoperable due to causes 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 CEA group 5, operation in $10 DES I and 2 may continue.

See Special Test Exceptions 3.10.2 and 3.10.4.

l CALVERT CLIFFS - UNIT 2 3/4 1-17 Amendment No.

l l

I l

l REACTIVITY CONTROL SYSTENTS l

l LI511 TING CONDITION FOR OPER ATION l

l e.

With one or more CEAs misaligned from any other CEAs in its group l

by more than 7.5 inches but less than 15 inches, operation in blODES l

1 and 2 may continue, provided that within one hour the misaligned CEA(s) is either:

I.

Restored to OPERABLE status within its above specified alignment requiremeists, or 2.

Declared inoperable.

After declaring the CEA inoperable, operation in blODES I and 3 may continue for up to 7 days per occurrence with a total accumulated time of s 14 days per calendar year provided all of the following conditions are met:

a.

The TilERhlAL POWER level shall be reducing to s 70% of the I

maximum allowable TIIERSIAL POWER level for the existing l

Reactor Coolant Pump combination within one hour; if negative reactivity insertion is required to reducing TIIER51AL POWER, l

boration shall be used, b.

Within one hour after reducing the TIIERSIAL POWER as required by a) above, the remainder of the CEAs in the group with the inoperable CEA shall be aligned to within 7.5 inches of the inoperable CEA while maintaining the allowable CEA sequence and insertion limits shown on Figure 3.1-2; the TIIERSIAL POWER level shall be restricted pursuant to Specification 3.1.3.6 during subsequent operation.

f.

With one CEA misaligned from any other CEA in its group by 15 inches or more, operation in blODES I and 2 may continue, provided that the misaligned CEA is positioned within 7,5 inches of the other CEAs in its group in accordance with the time allowance shown in Figure 3.1-3.

The pre-misaligned F[ value used to determine the allowable time to realign the CEA from Figure 3.1-3 shall be the latest measurement taken within 5

days prior to the CEA misalignment.

If no measurements were taken within 5 days prior to the misalignment, a pre-misaligned F[of I.65 shall be assumed.

g.

With one CEA misaligned from any other CEA in its group by 15 inches or more at the conclusion of the time allowance permitted in Figure 3.1-3, immediately start to implement the following actions:

l 1.

If the TIIERSIAL POWER level prior to the misalignment was greater than 50% of RATED TIIERSIAL POWER, TIIERSIAL POWER shall be reduced to less than the greater of:

CALVERT CLIFFS - UNIT 2 3/4 1-18 Amendment No.

l l

l

REACTIVITY CONTROL SYSTESIS LINIITING CONDITION FOR OPERATION a) 50% of RATED THERSIAL POWER b) 75% of the THER5tAL POWER level prior to the misalignment within one hour after exceeding the time allowance permitted by Figure 3.1-3.

2.

If the THER5tAL POWER level prior to the misalignment was less than 50% of RATED THERSIAL POWER, maintain THER5tAL POWER no higher than the value prior to misalignment.

If negative reactivity insertion is required to reduce THER5tAL POWER, boration shall be used. Within one hour after establishing the appropriate THER5tAL POWER as required above, either:

l 1.

Restore the CEA to within the above specified alignment l

requirements, or 2.

Declare the CEA inoperable. After declaring the CEA inoperable, POWER OPERATION may continue for up to 7 days per occurrence with a total accumulated time of s 14 days per calendar year l

provided the remainder of the CEAs in the group with the i

inoperable CEA are aligned to within 7.5 inches of the inoperable CEA while maintaining the allowable CEA sequence and insertion l

limits shown on Figure 3.1-2; the THERSIAL POWER level shall be

)

restricted pursuant to Specification 3.1.3.6 during subsequent operation.

h.

With more than one CEA inoperable or misaligned from any other CEA in its group by 15 inches (indicated position) or more, be in at least IlOT STANDBY within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months .

i.

For the purposes of performing the CEA operability test of TS 4.1.3.1.2, if the CEA has an inoperable position indication channel, the alternate indication system (pulse counter or voltage dividing network) will be used to monitor position.

If a direct position indication (full out reed switch or voltage dividing network) cannot be restored within ten minutes from the commencement of CEA motion, or CEA withdrawal exceeds the surveillance testing insertion by > 7.5 inches, the position of the CEA shall be assumed to have been > 15 inches from its group at the commencement of CEA motion.

i l

CALVERT CLIFFS - UNIT 2 3/4 l-19 Amendment No.13, 67, I

REACTIVITY CONTROL SYSTENIS SURVEILLANCE REOUIRENfENTS 4.1.3.1.1 The position of each CEA shall be determined to be within 7.5 inches l

(indicated position) of all other CEAs in its group at least once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months except during time intervals when the Deviation Circuit and/or CEA Motion Inhibit are inoperable, then verify the individual CEA positions at least once per 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months .

4.1.3.1.2 Each CEA not fully inserted shall be determined to be OPERABLE by inserting it at least 7.5 Inches at least once per 31 days.

4.1.3.1.3 The CEA Motion Inhibit shall be demonstrated OPERABLE at least I

once per 31 days by a functional test which verifies that the circuit maintains the CEA group overlap and sequencing requirements of Specification 3.1.3.6 and that the circuit also prevents any CEA from being misaligned from all other l

CEAs in its group by more than 7.5 inches (indicated position).

l l

CALVERT CLIFFS - UNIT 2 3/4 1 19A Amendment No.13, 67,

REACTIVITY CONTROL SYSTEMS l

BASES Overpower margin is provided to protect the core in the event of a large misalignment ( a 15 inches) of a CEA. However, this misalignment would cause distortion of the core power distribution. The reactor protective system would not detect the degradation in radial peaking factors and since variations in other system parameters (e.g., pressure and coolant temperature) may not be sufficient to cause trips, it is possible that the reactor could be operating with l

process variables less conservative than those assumed in generating LCO and LSSS setpoints.

The, ACTION statement associated with a large CEA misalignment requires prompt action to realign the CEA to avoid excessive margin degradation.

If the CEA is not realigned within the given time constraints, action is specified which will preserve margin, including reductions in TilERMAL POWER.

For a single CEA misalignment, the time allowance to realign the CEA (Figure 3.1-3) is permitted for the following reasons:

1.

The margin calculations which support the, power distribution LCOs for DNDR are based on a steady-state Ff as specified in Technical Specification 3.2.3.

2.

When the actual F[ is less than the Technical Specification value, additional margin exists.

3.

This additional margin can be credited to offset the increase in F[

with time that will occur following a CEA misalignment due to xenon redistribution.

The requirement to reduce power level after the time limit of Figure 3.13 is reached offsets the continuing increase in FT that can occur due to xenon redistribution. A power reduction is not required below 50% power. Delow 50%

power there is sufficient conservatism in the DNB power distribution LCOs to i

completely offset any, or any additional, xenon redistribution effects.

The ACTION statements applicable to misaligned or inoperable CEAs include requirements to align the OPENAHLE CEAs in a given group with the inoperable CEA. Conformance with these alignment requirements bring the core, within a short period of time, to a configuration consistent with that assumed in generating LCO and LSSS setpoints, llowever, extended operation with CEAs significantly inserted in the core may lead to perturbations in 1) local burnup,

2) peaking factors, and 3) available shutdown margin which are more adverso i

than the 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.

i i

CALVERT CLIFFS - UNIT 2 8 3/4 1-4 Amendment No. 67, 71, I

I

REACTIVITY CONTROL SYSTEMS l

BASES Operability of the CEA position indicators is required to determine CEA positions and thereby ensure compliance with the CEA alignment and insertion limits and ensures proper operation of the rod block circuit.

The CEA " Full l

In" and " Full Out" limits provide an additional independent means for l

determining the CEA positions when the CEAs are at either their fully inserted or fully withdrawn positions.

Therefore, the OPERABILITY and the ACTION statements applicable to inoperable CEA position indicators permit continued operations when positions of CEAs with inoperable indicators can be verified by the " Full in" or " Full Out" limits.

l CEA positions and OPERABILITY of the CEA position indicators are l

required to be verified on a nominal basis of once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months with more l

frequent verifications required if an automatic monitoring channel is inoperable.

l These verification frequencies are adequate for assuring that the applicable LCOs are satisfied.

The surveillance requirements affecting CEAs with inoperable position indication channels allow 10 minutes for testing each affected CEA. This time limit was selected so that 1) the time would be long enough for the required testing, and 2) if all position indication were lost during testing, the time would be short enough to allow a power reduction to 70% of maximum allowable thermal power within one hour from when the testing was initiated. The time limit ensures CEA misalignments occurring during CEA testing are corrected within the time requirements required by existing specifications.

The maximum CEA drop time restriction is consistent with the assumed CEA drop time used in the accident analyses. Measurements with Tayg a 5150 and with all reactor coolant pumps operating ensures that the CALVEllT CLilTS - UNIT 2

!! 3/4 l-4A Amendment No. 67, 71

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ML20206S185

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