Text

Proposed Rev to Improved Tech Specs Section 3.1
	ML20196G661
Person / Time
Site:	Byron, Braidwood
Issue date:	11/30/1998
From:	; COMMONWEALTH EDISON CO.
To:	;
Shared Package
ML20196G660	List: ML20196G655; ML20196G661;
References
	NUDOCS 9812080053
	Download: ML20196G661 (33)
	v • d • e

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5 i ENCLOSURE 1 1:

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- ITS REVISION S i

ITS SECTION 3.1 I

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9812090053 981130 TT i 4

PDR ADOCK 050004541:s P PDR t~ i.

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Rod Position Indication

, 3.1.7

, n U

3.1 REACTIVITY CONTROL SYSTEMS l l

3.1.7 Rod Position Indication !

l LCO 3.1.7 The Digital Rod Position Indication (DRPI) System and the '

Demand Position Indication System shall be OPERABLE.

APPLICABILITY: MODES 1 and 2.

ACTIONS NOTE Separate. Condition entry is allowed for each inoperable DRPI and each demand j position indicator.

CONDITION REQUIRED ACTION COMPLETION TIME l A. One DRPI per group A.1 Verify the position Once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months es inoperable for one or of the rods with b)

/ more groups. inoperable DRPIs by using movable incore i

detectors.

2 A.2 Reduce THERMAL POWER 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months '

to s 50% RTP. I B. One or more reds with B.1 Initiate action to Immediately inoperable DRPIs have verify the position 1 been moved in excess of the rods with of 24 steps in one inoperable DRPIs by direction since the using movable incore last determination of detectors.

the rod's position.

E B.2 Reduce THERMAL POWER 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months to s 50% RTP.

7-. (continued)

(

BYRON - UNITS 1 & 2 3.1.7-1 Amendment 106

c l

Rod Position Indication 3.1.7 l l l

. ACTIONS (continued)

CONDITION REOUIRED ACliON COMPLETION TIME l l- l l 'C. One demand position C.1.1 Verify by Once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months f l indicator per bank administrative means :

L inoperable for one or all DRPIs for the !

! more banks. affected bank (s) are ;

l OPERABLE. l l

AND j Once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months !

C.1.2 Verify the most !

withdrawn red and the I least withdrawn rod of the affected bank (s) are t s 12 steps apart. !

QR 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months i I C.2 Reduce THERMAL POWER I l to s 50% RTP.

I D. RequiredActionand D.1 Be in MODE 3. 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months associated Completion Time not met.

SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY l

SR 3.1.7.1 Verify each DRPI agrees within 12 steps of Prior to the group demand position for the full criticality indicated range of rod travel. after each removal of the

._ reactor head.

l

! I i i

0 t

BYRON - UNITS 1 & 2 3.1.7-2 Amendment 106 I

-. _ _ _ .-. _ _ . - = - . - -- - - -- -- - _ - . .

i Rod Position Indication B 3.1.7 l

lO

!U BASES l ACTIONS (continued)

A.1 l

' When one DRPI channel per group fails. the position of the rod can still be determined by use of the movable incore detectors. Based on experience. normal power oaeration does not require excessive movement of banks. If a Jank has been significantly moved, the Required Action of B.1 or B.2 below is required. Therefore, verification of RCCA position within the Completion Time of 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months is adequate for ,

allowing continued full power operation, since the probability of simultaneously having a rod significantly out of position and an event sensitive to that rod position is small.

A_2 Reduction of THERMAL POWER to s 50% RTP puts the core into a condition where rod position will not cause core peaking factors to approach the core peaking factor limits.

The allowed Completion Time of 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months is reasonable. based on operating experience, for reducing power to s 50% RTP O- from full power conditions without challenging plant systems and allowing for rod position determination by Required Action A.1 above.

B.1 and B.2 These Required Actions clarify that when one or more rods with inoperable DRPIs have been moved in excess of 24 steps in one direction, since the position was last determined.

the Required Actions of A.1 and A.2 are still appropriate but must be initiated 3romptly under Required Action B.1 to begin verifying that taese rods are still properly positioned, relative to their group positions.

If immediate actions have not been initiated to verify the rod's position.. THERMAL POWER must be reduced to s 50% RTP within 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months to avoid undesirable power distributions that could result from continued operation at > 50% RTP. if one or more rods are misaligned by more than 24 steps.

O G

BYRON - UNITS 1 & 2 B 3.1.7 - 6 Revision 0

t i

Rod Position Indication B 3.1 7 i e

p)

G BASES i

ACTIONS (continued)

C.1.1 and C.1.2 With one demand position indicator per bank inoperable, the I rod positions can be determined by the DRPI System. Since normal power operation does not require excessive movement of rods. verification by administrative means that the DRPIs s for the affected banks are OPERABLE and the most withdrawn l rod and the least withdrawn rod of the affected banks are l s 12 ste)s apart within the allowed Completion Time of once every 8 lours is ade This verification can be an examination of logs,quate. administrative controls, or other information that shows that all DRPIs in the affected bank are OPERABLE.

C.2 Reduction of THERMAL POWER to s 50% RTP puts the core into a condition where rod position will not cause core peaking to approach the core peaking factor limits. The allowed l

Completion Time of 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months provides an acceptable period of i time to verify the rod positions per Required Actions C.1.1 and C.I.2 or reduce power to s 50% RTP.

D.1 If the Recuired Actions cannot be completed within the associatec Completion Time. the plant must be brought to a MODE in which the requirement does not apply. To achieve this status, the plant must be brought to at least MODE 3 within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months . The allowed Completion Time is reasonable.

based on operating experience, for reaching the required MODE from full power conditions in an orderly manner and without challenging plant systems.

1 O

BYRON - UNITS 1 & 2 B 3.1. 7 - 7 Revision 0

Rod Position Indication B 3.1.7

/~'N BASES U

SURVEILLANCE SR 3.1.7.1 REQUIREMENTS Verification that the DRPI agrees with the demand position within 12 steps ensures that the DRPl is operating correctly. Since the DRPI does not display the actual shutdown rod positions between 18 and 210 steps. only points within the indicated ranges are required in comparison.

This surveillance is performed prior to reactor criticality after each removal of the reactor head, since there is potential for unnecessary plant transients if the SR were performed with the reactor at power.

REFERENCES 1. 10 CFR 50. Appendix A. GDC 13.

2. UFSAR Chapter 15.

s.i>

\

l-t/

BYRON - UNITS 1 & 2 B 3.1. 7 - 8 Revision 0

Rod Position Indication '

1 3.1.7

)

l 3.1 REACTIVITY CONTROL SYSTEMS 3.1.7- Rod Position Indication LCO 3.1.7 The Digital Rod Position Indication (DRPI) System and the ;

Demand Position Indication System shall be OPERABLE. i APPLICABILITY: MODES 1.and 2. !

l ACTIONS

\

~

NOTE i Separate Condition entry is allowed for each inoperable DRPI and each demand. :

position indicator.

l CONDITION REQUIRED ACTION COMPLETION TIME l

l A. One DRPI per group A.1 Verify the position Once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months

. inoperable for one or of the rods with more groups. inoperable DRPIs by l using movable incore i l detectors. .

@ I A.2 Reduce THERMAL POWER 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months to s 50% RTP. ,

I B. One or more rods with B.1 Initiate action to Immediately ,

inoperable DRPIs have verify the position l been moved in excess of the rods with '

L of 24 steps in one inoperable DRPIs by <

l direction since the using movable incore last determination of detectors.

L the rod's position. >

% l L B.2 Reduce THERMAL POWER 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months ;

to s 50% RTP. I

{ \

(continued) !

BRAIDWOOD - UNITS 1 & 2 3.1.7-1 Amendment 98 I

l

i Rod Position Indication 3.1 ?

ACTIONS (continued) i ("')N

!s'~' CONDITION REQUIRED ACTION COMPLETION TIME '

l l

l C. One demand position C.1.1 Verify by Once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months i indicator per bank administrative means )

inoperable for one or all DRPIs for the more banks. affected bank (s) are OPERABLE. l AND Once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months C.1.2 Verify the most withdrawn rod and the least withdrawn rod of the affected bank (s) are s 12 steps apart.

@ 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months l C.2 Reduce THERMAL POWER l to s 50% RTP. i i

D. Required Action and D.1 Be in MODE 3. 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months i

associated Completion Time not met.

l i

i SURVEILLANCE REOUIREMENTS SURVEILLANCE FREQUENCY SR 3.1.7.1 Verify each DRPI agrees within 12 steps of Prior to i the group demand position for the full criticality I l

indicated range of rod travel. after each removal of the reactor head. l i

i I

n '

' k.)

BRAIDWOOD - UNITS 1 & 2 3.1.7-2 Amendment 98 l

i

l Rod Position Indication i B 3.1./ <

1 l

'/' BASES '

!d ACTIONS (continued) l A.1 1

l When one DRPI channel per group fails, the position of the !

! rod can still be determined by use of the movable incore I detectors. Based on experience, normal power operation does I l- not require excessive movement of banks. If a bank has been significantly moved, the Required Action of B.1 or B.2 below is required. Therefore, verification of RCCA position within the Completion Time of 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months is adequate for '

allowing continued full power operation since the probability of simultaneously having a rod significantly out of position and an event sensitive to that rod position is small.

A.2 Reduction of THERMAL POWER to 5 50% RTP puts the core into a :

condition where rod position will not cause core peaking l factors to approach the core peaking factor limits. i

, The allowed Completion Time of 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months is reasonable, based on operating experience, for reducing power to s 50% RTP

'O' from full power conditions without chD lenging )lant systems and allowing for rod position determination by Required Action A.1 above.

B.1 and B.2 These Required Actions clarify that when one or more rods with inoperable DRPIs have been moved in excess of 24 steps in one direction since the position was last determined.

the Required Actions of A.1 and A.2 are still appropriate but must be initiated aromptly under Required Action B.1 to begin verifying that t1ese rods are still properly positioned relative to their group positions.

If immediate actions have not been initiated to verify the rod's position. THERMAL POWER must be reduced to s 50% RTP within 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months to avoid undesirable power distributions that could result from continued operation at > 50% RTP. if one or more rods are misaligned by more than 24 steps.

l l

lO

( BRAIDWOOD - UNITS 1 & 2 83.1.7-6 Revision 0 l

Rod Position Indication B 3.1.7 BASES l ACTIONS (continued)

C.l.1 and C.1.2 l

With one demand position indicator per bank inoperable. the rod positions can be determined by the DRPI System. Since normal power operation does not require excessive movement of rods, verification by administrative means that the DRPIs for the affected banks are OPERABLE and the most withdrawn rod and the least withdrawn rod of the affected banks are

s 12 ste)s apart within the allowed Completion Time of once every 8 lours is adequate. This verification can be an examination of logs, administrative controls, or other information that shows that all DRPIs in the affected bank are OPERABLE.

l C.2

, Reduction of THERMAL POWER to s 50% RTP puts the core into a l condition where rod position will not cause core peaking to l approach the core peaking factor limits. The allowed Completion Time of 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months provides an acceptable period of time to verify the rod positions per Required Actions C.l.1 and C.1.2 or reduce power to s 50% RTP.

D.1 '

i If the Required Actions cannot be completed within the

! associated Completion Time, the plant must be brought to a i MODE in which the requirement does not apply. To achieve l this status, the plant must be brought to at least MODE 3 l

within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months . The allowed Completion Time is reasonable.

based on operating experience, for reaching the required MODE from full power conditions in an orderly manner and without challenging plant systems.

O G

[ BRAIDWOOD - UNITS 1 & 2 B 3.1.7 - 7 Revision 0 I

. ._-.. - .- ._ . _ ~ - . - - . _ . . - . . - . - _ - . - . _

l

, Rod Position Indication j B 3.1.7 j

BASES SURVEILLANCE SR 3.1. 7.1 2

REQUIREMENTS

, Verification that the DRPI agrees with the demand position

within 12 steps ensures that the DRPI is operating correctly. Since the DRPI does not display the actual snutdown rod positions between 18 and 210 steps, only points within the indicated ranges are required in comparison.

This surveillance is performed prior to reactor criticality after each removal of the reactor head, since there is potential for unnecessary plant transients if the SR were performed with the reactor at power.

REFERENCES 1. 10 CFR 50. Appendix A. GDC 13.

2. UFSAR. Chapter 15.

I 1

l 1

1 l

l l

BPAIDWOOD - UNITS 1 & 2 B 3.1.7 - 8 Revision 0

Rod Position Indication 3.1.7 3.1 REACTIVITY CONTROL SYSTEMS v[1.

3.1 7 Rod Position Indication LCO 3.1.7 The Digital Rod Position Indication (DRPI) System and the Demand Position Indication System shall be OPERABLE.

APPLICABILITY: MODES 1 and 2. I t

ACTIONS

=- -

NOTE Separate Condition entry is allowed for each inoperable DRPI and each demand position indicator.

CONDITION ~ REQUIRED ACTION COMPLETION TIME A. One DRPI per group A.1 Verify the position Once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months inoperable for one or of the rods with O- more groups. inoperable DRPIs by using movable incore detectors.

A.2 Reduce THERMAL POWER 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months to s 50% RTP.

i B. One or more rods with B.1 Initiate action to Immediately inoperable DRPIs have verify the position been moved in excess of the rods with of 24 steps in one -inoperable DRPIs by direction since the using movable incore last determination of detectors.

the rod's position.

2 B.2 Reduce THERMAL POWER 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months to 5 50% RTP.

(continued) e O

BYRON - UNITS.1 & 2 3.1.7-1 11/30/98 Revision S

-~ . .. - _ - . - . - . . . . - - . - . . . - . _ - . - - - . _ . - ..

Rod Position Indication 3.1.7 ACTIONS (continued)

CONDITION REQUIRED ACTION COMPLETION TIME

l. l C. One demand position C.1.1 Verify by Once per 8 hour9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months .s indicator per bank administrative means inoperable for one or all DRPIs for the ,

! more banks. affected bank (s) are >

OPERABLE. 1 AND l C Once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months '

' 73 l C.I.2 Verify the most ;

withdrawn rod and the -

l

$- least withdrawn rod I t of the affected i bank (s) are ,

! s 12 steps apart.

@ 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months i l C.2 Reduce THERMAL POWER l to s 50% RTP.

l Ol D. Required Action and associated Completion Time not met.

D.1 Be in MODE 3. 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months i

l i

SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY i

l~

.SR 3.1.7.1 Verify each DRPI agrees within 12 steps of Prior to the group demand position for the full criticality indicated range of rod travel. after each removal of the reactor head.

i.

1 BYRON - UNITS 1 & 2 3.1.7-2 11/30/98 Revision S j i

1 Rod Position Indication B 3.1 ~ l BASES j

ACTIONS (continued)

A.1 When one DRPI charinel per group fails, the position of the rod can still be determined by use of the movable incore detectors. Based on experience. normal power caeration aces not require excessive movement of banks. If a aank has been significantly moved. the Required Action of B.1 or B.2 below i is required. Therefore, verification of RCCA position within the Completion Time of 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months is adequate for allowing continued full power operation. Since the probability of simultaneously having a rod significantly out i of position and an event sensitive to that rod position is small.

A.2 e Reduction of THERMAL POWER to s 50% RTP puts the core into a '

y condition where rod position will not cause core peaking

'l factors to approach the core peaking factor limits. :

The allowed Completion Time of 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months is reasonable. based '

e on operating experience, for reducing ower to s 50% RTP l from full power conditions without cha lenging plant systems and allowing for rod position determination by Required Action A.1 above.

B.1 and B.2 These Required Actions clarify that when one or more rods with inoperable DRPIs have been moved in excess of 24 steps in one direction, since the position was last determined.

the Required Actions of A.1 and A.2 are still appropriate but must be initiated 3romptly under Required Action B.1 to begin verifying that t7ese rods are still properly positioned, relative to their group positions.

If immediate actions have not been initiated to verify the rod's position. THERMAL POWER must be reduced to s 50% RTP within 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months to avoid undesirable power distributions that could result from continued operation at > 50% RTP. if one or more rods are misaligned by more than 24 steps.

A U

BYRON - UNITS 1 & 2 B 3.1.7 - 6 12/3/98 Revision S

Rod Position Indication B 3.1.7 l

,bG BASES 3 ACTIONS (continued) n il C.1.1 and C 1.2 m

I e

With one demand position indicator per bank inoperable the rod positions can be determined by the DRPI System. Since ;

normal power operation does not require excessiv9 movement '

of rods, verification by administrative means that the DRPIs

' for the affected banks are OPERABLE and the most withdrawn ;

rod and the least withdrawn rod of the affected banks are s 12 steps apart within the allowed Completion Time of once every 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months is adequate. This verification can be an :

l examination of logs, administrative controls, or other )

information that shows that all DRPIs in the affected bank are OPERABLE.

j C.2 Reduction of THERMAL POWER to s 50% RTP puts the core into a i condition where rod position will not cause core peaking to i approach the core peaking factor limits. The allowed '

Completion Time of 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months provides an acceptable period of time to verify the rod positions per Required Actions C.1.1 l and C.1.2 or reduce power to s 50% RTP.

, 0vel D1 l

O If the Recuired Actions cannot be completed within the l

6 associatec Completion Time, the plant must be brought to a MODE in which the requirement does not apply. To achieve i this status, the plant must be brought to at least MODE 3 l within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months . The allowed Completion Time is reasonable.

! based on operating experience, for reaching the required MODE from full power conditions in an orderly manner and without challenging plant systems.

l l

O BYRON - l! NITS 1 & 2 B 3.1.7 - 7 11/30/98 Revision S

l l

Rod Position Indication B 3.1.~

BASES l

SURVEILLANCE SR 3.1.7.1 REQUIREMENTS Verification that the DRPI agrees with the demand position within 12 steps ensures that the DRPI is operating correctly. Since the DRPI does not display the actual shutdown rod positions between 18 and 210 steps, only points within the indicated ranges are required in comparison. -

This surveillance is performed prior to reactor criticality after each removal of the reactor head, since there is potential for unnecessary plant transients if the SR were performed with the reactor at power.

REFERENCES 1. 10 CFR 50. Appendix A. GDC 13.

2. UFSAR, Chapter 15.

l l

l I l

l A

V BYRDN - UNITS 1 & 2 B 3.1. 7 - 8 11/30/98 Revision S t

l -

(, ;

L Rod Position Indication 3.1.7 3.1 REACTIVITY CONTROL SYSTEMS 3.1.7- Rod Position Indication -

LC0 3.1,7. The Digital Rod Position Indication (DRPI) System and the Demand Position Indication System shall be OPERABLE.

l APPLICABILITY: MODES 1 and 2.

ACTIONS l 1

NOTE I Separate Condition entry is allowed for each inoperable DRPI and each demand position. indicator.

CONDITION- REQUIRED ACTION COMPLETION TIME A. One DRPI per~ group. A.1 Verify the position Once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months inoperable for one or of the rods with l more groups. inoperable DRPIs by '

-[A using movable incore detectors. ,

i DB A.2 Reduce THERMAL POWER 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months to s 50% RTP.

I B. One or more rods with B.1 Initiate action to Immediately ;

inoperable DRPIs have~ verify the position l L

been moved in excess of the rods with l of 24 steps in one inoperable DRPIs by direction since the using movable incore last determination of detectors.

the rod's position.

B.2 Reduce THERMAL POWER 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months ;

to u 50% RTP. !

(continued) i BRAIDWOOD - UNITS 1 & 2 3.1.7-1 11/30/98 Revision S L !

L l

- ..._.. _ .. ..~.-_____.._.__._._ _ _ _.._

Rod Position Indicatior. !

3.1 '

ACTIONS (continued)

CONDITION REQUIRED ACTION COMPLETION TIME l l .l C. One demand position C.1.1 Verify by Once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months '

L indicator per bank administrative means inoperable for one or all DRPIs for the !

more banks. affected bank (s) are OPERABLE. l 9 AND i

t Once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months )

si l C.1.2 Verify the most l H withdrawn rod and the j- least withdrawn rod of the affected bank (s) are

! 5 12 steps apart.

l @ 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months l C.2 . Reduce THERMAL POWER l to s 50% RTP.

l lO j D. Required Action and D.1 Be in MODE 3. 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months associated Completion.

Time not met.

l l

i SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY

\

l SR 3.1.7.1 Verify each DRPI agrees within 12 steps of Prior to ;

the group demand position for the fulI criticality indicated range of rod travel. after each removal of the i

reactor head.

O BRAIDWOOD - UNITS 1 & 2 3.1.7-2 11/30/98 Revision S i-l-

l Rod Position Indication B 3.1.7 BASES ACTIONS (continued) -

i A.1 When one DRPI channel per group fails. the position of the ,

rod can still be determined by use of the movable incore '

l detectors. Based on experience, normal power operation does l l not require excessive movement of banks. If a bank has been significantly moved the Required Action of B.1 or B.2 below is required. Therefore, verification of RCCA position within the Completion Time of 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months is adequate for allowing continued full power operation, since the probability of simultaneously having a rod significantly out l of position and an event sensitive to that rod position is small.

A.2 e Reduction of THERMAL POWER to s 50% RTP puts the core into a

! ? condition where rod position will not cause core peaking l

G factors to approach the core peaking factor limits.

f The allowed Completion Time of 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months is reasonable. based on operating experience, for reducing power to s 50% RTP Qs from full power conditions without challenging plant systems and allowing for rod position determination by Required l

Action A.1 above. '

l B.1 and B.2 l These Required Actions clarify that when one or more rods ,

l with inoperable DRPIs have been moved in excess of 24 steps '

l in one direction. since the position was last determined.

l the Required Actions of A.1 and A.2 are still appropriate l but must be initiated 3romptly under Required Action B.1 to begin verifying that tlese rods are still properly positioned relative to their group positions.

If immediate actions have not been initiated to verify the rod's position. THERMAL POWER must be reduced to s 50% RTP within 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months to avoid undesirable power distributions that could result from continued operation at > 50% RTP. if one or more rods are misaligned by more than 24 steps.

l iO

( BRAIDWOOD - UNITS 1 & 2 B 3.1. 7 - 6 12/3/98 Revision S i

Rod Position Indication :

B 3.1.7 BASES g ACTIONS (continued)

$l m

C.1.1 and C.1.2 E With one demand position indicator per bank inoperable. the rod positions can be determined by the DRPI System. Since normal power operation does not require excessive movement ;

of rods. verification by administrative means that the DRPIs l for the affected banks are OPERABLE and the most withdrawn !

rod and the least withdrawn rod of the affected banks are I s 12 ste)s apart within the allowed Completion Time of once every 8 lours is. adequate. This verification can be an !

examination of logs, administrative controls, or other l information that shows that all DRPIs in the affected bank i are OPERABLE.

l l C.2 !

i l

Reduction of THERMAL POWER to s 50% RTP puts the core into a i condition where rod position will not cause core peaking to !

approach the core peaking factor limits. The allowed ;

Completion Time of 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months provides an acceptable period of l time to verify the rod positions per Required Actions C.1.1

and C.1.2 or reduce power to s 50% RTP.

j O D.1 ni l

$* If the Required Actions cannot be completed within the associated Completion Time the plant must be brought to a ,

MODE in which the requirement does not apply. To achieve '

this status, the plant must be brought to at least MODE 3 within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months . The allowed Completion Time is reasonable.

based on operating experience for reaching the required MODE from full power conditions in an orderly manner and without challenging plant systems.

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BRAIDWOOD - UNITS 1 & 2 B 3.1. 7 - 7 11/30/98 Revision S

Rod Position Indication l

B 3.1.'

BASES Q(N SURVEILLANCE SR 3.1.7.1 REQUIREMENTS Verification that the DRPI agrees with the demand position within 12 steps ensures that the DRPI is operating correctly. Since the DRPI does not display the actual I snutdown rod oositions between 18 and 210 step: only points l within the indicated ranges are required in comparison.

This surveillance is performed prior to reacto criticality after each removal of the reactor head, since there is potential for unnecessary plant transients if the SR were performed with the reactor at power.

l REFERENCES 1. 10 CFR 50. Appendix A. GDC 13.

2. UFSAR, Chapter 15.

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l BRAIDWD0D - UNITS 1 & 2 B 3.1.7 - 8 11/30/98 Revision S l

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LCO 3, l. 7 LCo 3, I . +

3,1 REACTIVITY CONTROL SYSTEMS l

3,g,J POSITION INDICATION SYSTEMS - OPERATING

.O LIMITING CONDITION FOR OPERATION 7

LCQ 3.1.@ ion System shall be OPERABLE

,Indicat (end crelThe Digital Ro ef det: W -'n; in: ::n:re; .cc '

m 1;:::::::: :tn- : 12 :::;;.)

~

APPLICABILITY: MODES 1 and 2. ll iTOSEarT 3,Wl7A * .O ALiAUM:

3 g' a, CMP % .

N With (a maximum of one) digital rod position indicator pe inoper-able either:

R* hel C Determine the position of the nonindicating rod (s) indirectly gA g,;

by the movable incore detectors at least once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months and immediately after any motion of the non-indicating rod which exceeds 24 steps in one direction since the last determination of the rod's position, or h ArrA,2 ar I

RA e.2 Reduce within 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months . THERMAL POWER to less than 50% of RATED THERMAL P l"

Coup C-irl With either:a maximum of one bank demand position indicator inoperable i p y y %g til .

P8 C,bl,.-tr (J C, l A Verify that all digital rod position indicators for the affected u bank are OPERABLE and that the most withdrawn rod and the least(C withdrawn rod of the bank are within a maximum of 12 steps of each other at least once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months , or c; C. ;. E Mn Reduce within 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months . THERMAL POWER to less than 50% of RATED THERMAL -

l <,_ Pi IdSET.T 3 t - D B

> N/b O l& !

_ SURVEILLANCE REQUIREMENTS S R. 3 .l. +.I l ^^ - -

Each digital rod position indicator shall be determined OPERABLE by ng that the Bank Demand Position Indication System and the Digital Rod

! Position 4xcep curing Indication System agree within 12 steps at least once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months interval hen the rod sition devi ion alarm yr inoper-

! ab , then c are the De nd Position sition ication Sys e and the M oital Ro ication Sv L at least o e per 4 hour4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months ./ /

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BYRON - UNITS 1 & 2 3/4 1-17 my s L _ - . - - - - _

l !

t r

CTS INSERT (S)

-O .SECTION 3.1 l \

LC0 3.1.7 j INSERT 3.1 17A (Au )

-ACTIONS NOTE --

Separate Condition entry is allowed for each inoperable Digital Rod Position

-Indicator (DRPI) and each demand position indicator.

L INSERT 3.1 17B (Mn )

CONDITION REQUIRED ACTION COMPLETION TIME l

l D. Required Action and 0.1 Be in MODE 3. 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months associated Completion -

Time not met.

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11/30/90 Revision S i

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g Lto 3 . *7 LCC 5. l. G s

5l REACTIVITY CONTROL SYSTEMS 2.i7 POSITION INDICATION SYSTEMS - OPERATING 3

LIMITING CONDITION FOR OPERATION

- -'+'- . _ . . .

j 1 1.J E The Digital Rod Position Indication System and the Demand Position'

_ Indication Sptem shall be OPERABLE (and c:;;bic cf desemi 'nc .tPacngcLrgc_

jositicra i J n (12; g py.

4 APPLICABILITY: MODES 1 and 2. " -

Lw- u -oA )

ACTION:

Q [4H~/ &

5 Jmup r[

i 6 CM U A 4. With(a maximum of one) digital rod position indicator per bei Pinoper-able either: -

(h h'\

4. Determine the position of the nonindicating rod (s) indirectly by the movable incore detectors at least once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months and

, RA S.1 immediately after any motion of the non-indicating rod which

exceeds 24 steps in one direction since the last determination ,

of the rod's position, or I Q A.; -2 .

Reduce THERMAL POWER to less than 50% of RATED THERMAL POWER

/3 8 A E 2. within 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months . le cotlO C -b- With a maximum of one bank demand position indicator inoperable either: h g

gh c,j,; - Verify that all digital rod position indicators for the af fected L gy (,,,2 bank are OPERABLE and that the most withdrawn rod and the least ?

withdrawn rod of the bank are within a maximum of 12 steps of d each other at least once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months , or I. A C . 2 -2 . Reduce THERMAL POWER to less than 50% of RATED THERMAL POWER within 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months . .

h

3. ) - m e . ' , c no D j, J[rc er+

SURVEILLANCE REOUIREMENTS

3 'M !

4.1.3.2) Each digital rod position indicator shall be determine.; OPERABLE by verifying that the Bank Demand Position Indication System and the Digital Rod Position Indication System agree within 12 steps at least once per 1? hours except uring time in .rvals wnen the d position devip ion alarm isf nope q able, hen compare t e Demand Positi Indication Systpn and the Digital Rod /

Rosi ion Indicatio System at least nce per 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months ./

LAq 7

BRAIDWOOD - UNITS 1 & 2 3/4 1-17 Qg

i. ,

i-I i CTS INSERT (S) !

SECTION 3.1 i LC0 3.1.7 ;

I INSERT 3.1_17A- (Au )

l ACTIONS NOTE- . I Separate Condition entry is allowed for each inoperable Digital Rod Position i Indicator (DRPI) and each demand position indicator. j l- . INSERT 3.1-17B (Mn )

l CONDITION REQUIRED ACTION COMPLETION TIME l D. Required Action and D.1 Be in MODE 3. 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months associated Completion O '4 e " t et.

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-l 11/30/98 Revision S I

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DISCUSSION OF CHANGES TO CTS rQ ITS SECTION 3.1 - REACTIVITY CONTROL SYSTEMS V

l .A u Not used.

A3 Not used.

l lA 3 Not used.

A3 CTS LC0 3.1.3.5 refers to individual shutdown rods. ITS LC0 3.1.5 refers to shutdown banks. The CTS has been revised to replace the word "All" with the word "Each" and to replace the word " rod (s)" with the word " bank (s)" This is an administrative change since it is implied that whenever a shutdown rod is not within limits, neither is the

. shutdown bank, and therefore the actions of ITS LCO 3.1.5 would apply.

This is perceived as the intent of the CTS wording, and therefore, the revised wording more accurately reflects this intent. The change is consistent with the wording of NUREG-1431.

)

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(^'5 V BYRON /BRAIDWOOD UNITS 1 & 2 3.1 4 11/30/98 Revision S i

1

1 Rod Position Indication 3 .1. _B-3.1 REACTIVITY CONTROL SYSTEMS 3.1.f Rod Position Indication 7

(e)'

LCO 3.1.@f ThekDigitalfRodPositionIndication DfkPI) System and i the Demand Position Indication System shall be OPERABLE.

APPLICABILITY: MODES I and 2.

ACTIONS (p a pr)

NOTE--------------:------h--------------

Separate Condition entry is allowed for each inoperableecc cont: 2-19

'ndic :03 ?

(W and each demand position indicator (pee-tag k CONDITION REQUIRED ACTION COMPLETION TIME A.

(, y One [D}RPI per group

(@ A.1 Verify the position Once per inoperable for one or of the rods with 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months more groups. inoperable 9 4u on' WI $ jndicaterC by using movable incore ,

detectors.

0_8 A.2 Reduce THERMAL POWER to s 50% RTP.

8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months {

g*

TomMc a:b oi, to E mmechately B. One or more rods with B.1 QIerify the position {4] Scurs inoperable ec5itleiC of the rods with (indiceturehavebeen inoperable Sc;itici moved in excess of gg g t dicatori by using

~24 steps in one direction since the h inovable incore q detectors.

last determination of 3 o

the rod's position. 0_8 t (continued)

\

WOG STS 3.1-17 Rev 1, 04/07/95 2ed $

i

' Rod Position Indicatlan O4 3 .1.9

/./ i

(/ ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME B. (continued) B.2 Reduce THERMAL POWER 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months 5 to s 50% RTP. O t

C. One demand position C.I.1

Verify by Once per indicator per bank administrative means 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months l*d '

.g inoperable for one or 6 all']D[RPIs for the g ,

more banks. affected bani(s)are s 1 OPERABLE. l{

4ND 9

pI l 1

C.1.2 Verify the most Once per withdrawn rod and the 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months !

least withdrawn rod 1' of the affected banys) Q are 5 12 steps apart.

s g

\s' %1 C.2 Reduce THERMAL POWER to s 50% RTP.

8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months lj p'V, 4

D. Required Action and D.1 Be in MODE 3. 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months ;

associated Completion i Time not met.

I h Q,/

WOG STS 3.1-18 Rev 1, 04/07/95 VpJ $

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l JUSTIFICATION FOR DIFFERENCES TO NUREG-1431 LC05 !

/S SECTION 3.1 - REACTIVITY CONTROL SYSTEMS b

Pw Required Actions A.1 and C.1 of ITS LCO 3.1.7 were revised to clarify that the Condition and Required Actions apply to one or more rods with ,

inoperable DRPIs. and not to one or more rods with inoperable demand !

position indicators.

I P

n NUREG-1431 LCO 3.1.8 (ITS LCO 3.1.7) Condition B has been revised to j require "immediately taking action to" verify the position of the rods '

with inoperable DRPIs whenever one or more rods with inoperable DRPIs moved in excess of 24 steps in one direction since the last determination of the rod's position. This change is consistent with Current Licensing Basis of CTS 3.1.3.2 Action a.1.

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) BYRON /BRAIDWOOD - UNITS 1 & 2 3.1 5 11/30/98 Rev:sion S

Rod Position Indication h

LC0 OPERABILITY of the position indicator channels ensures that (continued) inoperable, misaligned, or mispositioned control rods can be detected. Therefore, power peaking, ejected rod worth, and i

SDM can be controlled within acceptable limits.

APPLICABILITY TherequirementsontheDRPIandstepcountersareonly applicable in MODES I and 2 (consistent with LCO 3.1.6, LCO 3.1.5f and LC0 3.1.G)', because these are the only MODES in which power is generated, and the OPERABILITY and alignment of rods have the potential to affect the safety of l

the plant. In the shutoown MODES, the OPERABILITY of the '

shutdown and control banks has the potential to affect the required SDM, but this effect can be compensated far by an increase in the boron concentration of the Reactor Coolant System.

ACTIONS The ACTIONS table is modified by a Note indicating that a

_ separate Condition entry is allowed for each inoperable trotl g ueI positica indicator ;cr arous)and each demand position O indicator eer-trer#. This is acceptable because the Required 5 Actions for each Condition provide appropriate compensatory actions for each inoperable position indicator. (_

A.] j When one DRPI channel per group fails, the ' tion of th 0 l rod can still be determined by use of the ncor ovable) '*

i detectors. Based on experience, normal power operation does k '

not require excessive movement of banks. If a bank has been ip significantly moved, the Required Action of B.1 or B.2 below is required. Therefore, verification of RCCA position I4 within the Completion Time of 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months is adequate for ;

allowing continued full power operation, since the l probability of simultaneously having a rod significantly out of position and an event sensitive to that rod position is small.

(continued)

WOG STS B 3.1-49 Rev 1, 04/07/95 frv. S

Rod Position Indication h _

B 3.1.8 BASES

- n norcese core ACTIONS A.2 (continued)

Fe(ct^N'ocs

- # "* m ,

l Reduction of THERMAL POWER to s 50% RTP puts the core into a b condition where rod position [is not :ignificantb Offec+i i core peaking factors f ? 7 .F 6 -

The allowed Completion Time of 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months is reasonable, based on operating experience, for reducing power to s 50% RTP from full power conditions without challenging plant systems and allowing for rod position determination by Required Action A.1 above. c 5

B.1 and B.2 ppQ @ 'l These. Required Actiont larify that when one or more rods with inoperable 90:itier Mdic:terclhave been moved in excess of 24 steps in one direction, since the position was last determined, the Required Actions of A.1 and A.2 are still appropriate but must be initiated promptly under Required Action B.1 to begin verifying that these rods are y still properly positioned, relative to their group ,

positions.

,j a rrmedtate .odi_on:. have nethyen iiw&d b VWy r

e

- If it.H U] %rs, the rodhpositiong h:'/: not b;aa pP de@t:;;r.ined, THERMAL POWER must be reduced to s 50% RTP within 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months to avoid undesirable power distributions that could result from continued operation at > 50% RTP,r if one or more rods are misaligned by more than 24 steps. -T+re al h ;d Co..+1etivu Ti;;,; cf U; 5:;r: provid;; :n ;ccept;ble peri;d of ti;; te verif.7 the r;d p::itions.-- '

vn C.1.1 and C.1.2 k;

With one demand position indicator per bank inoperable, the rod positions can be determined by the DRPI System. Since normal power operation does not require excessive movement of rods, verification by administrative means that the w3

-> rent i un incitatort are OPERABLE and the most withdrawn rod and the least withdrawn rod 4are $ 12 steps apart within the (Q allowed Completion Time of once every 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months is adequate.c

__( oR P L m 4. . x -e _ , c - t n e.. 3 7(n u.e m...a ci ic.a o rmc v m i4 u m

e n te m omn. m on vi , , ;. d . . .we. -

a c, . m , ,, m cc ,i . . . .. m . u .c, g w 2, as t /t _ .. y c Wec4 ed Lm k me. own ^tt C . .}

(continued)

L WOG STS B 3.1-50 Rev 1, 04/07/95 P&J S

3 o

i l

h Rod Position Indication s3.19

'n l'Q BASES y

s

ACTIONS C.2 N~,

b .aan _ , , ,

,_, e j-u . i .m

~

j 't Reduction of THERMAL POWER to $ 50% RTP puts the core into a condition where rod positionin-ne_t-s490TB~cinMy-af.fecting" core peaking factor limits (fReW. The allowed Completion (,

Time of 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months provides an acceptable period of time to l

' verify the rod positions per Required Actions C.1.1 f and C.I.2 or reduce power to $ 50% RTP.

4 s

D.1 tE If the Required Actions cannot be completed within the associated Completion Time, the plant must be brought to a MODE in which the requirement does not apply. To achieve this status, the plant must be brought to at least MODE 3 within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months . The allowed Completion Time is reasonable, based on operating experience, for reaching the required MODE from full power conditions in an orderly manner and without challenging plant systems.

SURVEliLANCEhSR 3.1.0.1 REQUIREMENTS Verification that the DRPI agrees with the demand position within"{l2]' steps ensures that the DRPI is operating correctly. Since the DRPI does not display the actual l shutdown rod positions between 18 and 210 steps, only points within the indicated ranges are required in comparison.

Tre r +

T % onth] Frequency is based on the need to perform #

? M .sre_}- this Survenlance under the conditions that apply 1iTring a ;

plant outage and the-potential for unnecessary plant l transients if the SR wire performed-With the reactor at .

ipower. Operating experience-his shown these components I usually pass the SR-when performed at~a-Frequency of once every (18 monthC] Therefore, the Frequency ias-concluded N

p-ac6ptable from a reliability standpoint. s.

REFERENCES 1. 10 CFR 50, Appendix A, GDC 13.

2. UFSAR, Chapterl15[

O. l 5Ai . chapter [nji)

V -

l WOG STS B 3.1-51 Rev 1, 04/07/95 Rev 5

I JUSTIFICATION FOR DIFFERENCES TO NUREG 1431 BASES

,L)

/'N SECTION 3.1 - REACTIVITY CONTROL SYSTEMS P

23 NUREG-1431 LCO 3.1.8 (ITS LCO 3.1.7) Condition B has been revised to require "immediately taking action to" verify the position of the rods with inoperable DRPIs whenever one or more rods with inoperable DRPIs l moved in excess of 24 steps in one direction since the last determination of the rod's position. This change is consistent with Current Licensing Basis of CTS 3.1.3.2 Action a.1.

P3 In the Actions C.1.1 and C.1.2 SECTION of the Bases for ITS LCO 3.1.7. a list was added to give examples of administrative means that could be used to verify that DRPIs for the affected banks are operable when one demand position indicator per bank is inoperable.

P27 The Actions section of the Bases for ITS LCO 3.1.7 was revised to more accurately reflect the verbiage used in Required Actions D.1.1 and D.1.2 of ITS LCO 3.1.7.

Pa Not used.

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(,.) BYRON /BRAIDWOOD - UNITS 1 & 2 3.1-7 11/30/98 Revision S

ML20196G661

Text

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