ML20235W640

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Forwards Confirmation of Responses Provided in Telcons W/Nrc During Wk of 870622 Re Axial Flux Difference Spec Concerning Application for Amend to License NPF-30 for Transition to Westinghouse Vantage 5 Fuel Assemblies
ML20235W640
Person / Time
Site: Callaway Ameren icon.png
Issue date: 07/16/1987
From: Schnell D
UNION ELECTRIC CO.
To:
NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
ULNRC-1554, NUDOCS 8707230626
Download: ML20235W640 (14)
v • d • e


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' Union JECi1cc:aertec:  ;

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l 1901 Gratio! Street. St. Louis Donald F. SchneII Vice President July 16, 1987 U.S. . Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555 Gentlemen: ULNRC- 1554 DOCKET NUMBER 50-483 CALLAWAY PLANT APPLICATION FOR RELOAD LICENSE AMENDMENT USING WESTINGHOUSE VANTAGE 5 FUEL ASSEMBLIES

References:

1) ULNRC-1470 dated March 31, 1987
2) ULNRC-1491 dated April 15, 1987
3) ULNRC-1525 dated June 5, 1987
4) ULNRC-1535 dated June 18,-1987 References 1 through 4 transmitted the license application and additional supporting information for Callaway Cycle 3, in which a transition to Westinghouse VANTAGE 5 fuel will begin.

Transmitted herewith is confirmation of responses provided to NRC as part of telephone conversations during the week of June 22, 1987, concerning the Axial Flux Difference' specification submitted in Reference 1.

Attachment 1 identifies the NRC concerns and contains confirmation of our responses. Attachment 2 contains marked-up technical specification pages. The changes being made under this transmittal are identified by ballooning.

These changes clarify the intent of the previous changes transmitted by Reference 1,and the results of the Safety Evaluation and Significant Hazard Evaluation transmitted therein remain unchanged. This change will not adversely affect or endanger the health of the general public and does not involve an unreviewed safety question.

If there are any questions with respect to this subject, please contact us.

Very truly yours, 8707230626 070716 ~

PDR ADOCK 05000403 -

P PDR - Donald F. Schnell DS/plh

Attachment:

1) Responses to NRC concerns ), g
2) Marked-up Technical Specification Pages 4

Mailing Address: P.O. Box 149. St. Louis. MO 63166 l

- ____________A

4 STATE OF MISSOURI )

) SS CITY OF ST. LOUIS ) I Donald F. Schnell, of lawful age, being first duly sworn upon oath says that he is Vice President-Nuclear and an officer of Union Electric Company; that he has read the foregoing document and knows the content thereof; that he has executed the same for and on behalf of said company with full power and authority to do so; and that'the facts therein stated are true and correct to the best of his knowledge, information and belief.

By b6nald F. Schnell Vice President Nuclear i SUBSCRIBED and sworn to before me this l7thday of hf ,

198 7

.dW L}&

G. E. WATERS NOTARY PUBLIC, STATE OF MISSOURI MY COMMISSION EXPtRES 3/16/91 ST. LOUIS COUNTY l

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cc: Gerald Charnoff, Esq.

Shaw, Pittman, Potts & Trowbridge 2300 N. Street, N.W.

Washington, D.C. 20037 Dr. J. O. Cermak ..

CFA, Inc.

4 Professional Drive (Suite 110) -

Gaithersburg, MD 20879 ,

W. L. Forney Chief, Reactor Project Branch 1 U.S. Nuclear Regulatory Commission Region III 799 Roosevelt Road Glen Ellyn, Illinois 60137 {

Bruce Little Callaway Resident Office U.S. Nuclear Regulatory Commission RR#1 Stv2 edman, Missouri 65077 Tom Alexion (2)

Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Mail Stop 316 7920 Norfolk Avenue Bethesda, MD 20014 Ron Kucera, Deputy Director Department of Natural Resources P.O. Box 176 Jefferson City, MO 65102 Manager, Electric Depa;.tment Missouri Public Service Commission P.O. Box 360 Jefferson City, MO 65102 l

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  • Attachment 1 ULNRC-1554 Responses to NRC Requests on FgAFD Surveillance Responses to M. Dunnefeld's (NRC) requests on Callaway Fg Surveillance / Restricted Axial Flux Difference Operation (RAFDO)

Technical Specifications Request 1:

Does footnote (identified by #) of Section 3.2.l'(pg 3/4 2-1) apply to RAFDO operation?. Specifically, is the 16 hour1.851852e-4 days <br />0.00444 hours <br />2.645503e-5 weeks <br />6.088e-6 months <br /> exception on AFD limits allowed for INCORE/EXCORE calibration compatible with the philosophy of RAFDO operat!.on?

Response

No, the INCORE/EXCORE recalibration is not compatible with the philosophy of RAFDO operation if performed at the maximum allowed power level under RAFDO.

To clarify this, modify the footnote as follows:

Surveillance testing of the Power Range Neutron Flux channel may be performed pursuant to Specification 4.3.1.1 provided the

' indicated AFD is maintained within the Acceptable Operation Limits of Figure 3.2-1 and THERMAL POWER is less than or equal  !

to the Allowed Power Level during Normal Operation (APL 0,,,), g total of 16 hours1.851852e-4 days <br />0.00444 hours <br />2.645503e-5 weeks <br />6.088e-6 months <br />' operation may be accumulated with AFD outside j l

of the applicable required target band during testing without j penalty deviation.

      • APLNO = minimum [ 2.32
  • K(z) )
  • 100%

over z (F g (z)

  • W(z)NO F

g (z) and W(z)NO are defined in Specification 4.2.2.2.c

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, AttQchment 1 ULNRC-1554 Comments:

When in Normal' Operation, this allows INCORE/EXCORE recalibration to be performed at power levels allowed by Normal Operation.

When operating in RAFDO, INCORE/EXCORE recalibration may be performed under the RAFDO portion of the Technical Specification as long as the power level is reduced to a power level consistent with that allowed by Normal Operation. The INCORE/EXCORE recalibration may then proceed under the exception listed. The AFD may be outside the RAFDO AFD limits for up to the 16 hours1.851852e-4 days <br />0.00444 hours <br />2.645503e-5 weeks <br />6.088e-6 months <br /> stated in the exception. 'Upon completion of the recalibration, Restricted AFD Operation may proceed without having to re-enter RAFDO under Specification 4.2.2.3.a. as long as the RAFDO AFD

limits are maintained.

i By reducing power level to that allowed by Normal Operation, the

-recalibration can proceed as allowed by current Technical Specifications. Following the recalibration, RAFDO may proceed.

as long as the RAFDO AFD limits are maintained since the W(z)RAFDO accounts for increases in the steady state gF (z) that may occur when operating within the RAFDO AFD limits.

Request 2:

How is APLND (given in Section 3.2.1) determined?

Re_sponse APL" provides the minimum allowable power level for RAFDO. The value is determined by the core nuclear designer during the design of the cycle in question and is provided each cycle to the NRC in the Peaking Factor Limit Report (Specification 6.9.1.9). ]

The W(z)RAFDO values are determined by analyzing power shapes that could occur in RAFDO based on AFD values of +/-3 percent and power levels between APL" and 100%. The specific value of APLh I

Attachment 1 ULNRCd554 ND gg is determined by the nuclear designer. The valve of APL then checked during analysis to ensure that the resultitig W(z)RAFDO when combined with the predicted 9F (z), meets the Fg *K(z) limit. Smaller values allow for less restrictive limits on the range of power levels allowed during RAFDO, but result in values. This may result in more restrictive (larger) W(z)RAFggF maximum allowed power levels (APL ) of less than 100% RTP.

Larger values result in smaller W(z)RAFDO but, if too large, may make it impossible to satisfy Specification of 4.2.2.3.a. It would then be impossible to enter RAFDO. Typical values of APL" i

are 80 to 90% RTP. j Request 3:

j Aren't Specifications 4.2.2.2.f.2),a) and 4.2.2.2.f.2).b) redundant? The same question applies to 4.2.2.4.f.1 and 4.2.2.4.f.2.

Response

Yes they are. Surveillance 4.2.2.2.f.2).a) and 4.2.2.4.f.l.

should be deleted and the remaining options be renumbered. See I revised pages in which these changes are identified by ballooning.

Request 4:

Explain Specification 4.2.2.2.e and clarify it in the Bases.

Resportae i

i The intent of this specification is to account for possible increases in maximum F (z) values that may occur between flux  !

g maps. The parameter of concern is the minimum margin to the Fg *K(z) limit.

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l Attcchmznt 1 I ULNRC-1554 1

It can be determined whether this minimum margin is decreasing by j looking at the ratio of: )

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maximum .( Fx (zl_)

over z \ K(z) )

i from the current flux map and comparing it to the same ratio determined from the previous flux map. If this ratio has increased in the current measurement over the previous measurement, additional penalties must ae applied to the measured F (z) to account for further increases that may occur prior to 9

the next surveillance. This is accomplished by applying the penalty in 4.2.2.2.e.1 or performing more frequent surveillance as per 4.2.2.2.e.2. The added penalty or more frequent surveillance must continue until two successive flux maps demonstrate that the ratio described above is no longer increasing.

The following is to be added to Insert 6 of BASES 3/4.2.2 and 3/4.2.3.

Provisions to account for the possibility of decreases in margin to the F (z) limit during intervals between surveillance are 9

provided. Any decrease in the minimum margin to the F g (z) limit compared to the minimum margin determined from the previous flux map is determined by comparing the ratio of:

maximum

(_F9 (z) )

over z ( K(z) J taken from the current map to the same ratio from the previous map. The ratios to be compared from the two flux maps do not need to be calculated at identical z locations. Increases in this ratio indicate that the minimum margin to the F (z) limit 9

has decreased and that additional penalties must be applied to the measured F g (z) to account for further decreases in margin that could occur before the next surveillance. More frequent surveillance may also be substituted for the additional penalty.

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Attachmant 2 ULNRC- 1554 Marked-up Technical Specification Changes 1

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REVISlay 3 3/4.2 POWER DISTRIBUTION LIMITS

, m. 3/4.2.1 AXIAL FLUX OIFFERENCE g-

. LIMITINO CONDITION FOR OPERATION 3.2.1 The indicated AXIAL FLUX OIFFERENCE (AFD) shall be maintained within the following target band (flux difference units) about the target flux difference: -

s. 'e-n ru-r-e S' u, ?vxs;e :- u u'st ed bu--up r' ' m t'?- :- e u ' tr r/- . ~, . . ._s 3 - ;. .5 , U N r N r: =:r:; c eru-u'- t ed t u-aup r' ;-? ?* ~ * * "

The indicated AFD may cavlate outs hb .

Nficalle e the aboveYrequired targot band at greater 3 wbicbever it len than or equal to 50% but less than 0% of RATED -THEVAL POWERWrovided the indicated AFD is within the 'Acce;itable Operation Lleits of Figure 3.2-1 and the cumulated penalty deviation time does not exceed I hour during the *

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previous 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. j l, The indicated AFD may deviate outside the +beve equired target band at greater than 15% but less than 50% of RATED THERMAL POWER provided the cumulative penalty deviation time does not exceed I hcur during the previous 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

APPLICABILITY: MODE.1, above 15% of RATED THERMAL POWER"[

ACTION: /7,.J/c

a. With the indicated AFD outside of the equired target band

. and with THERMAL POWER greater than or equal 90%gfRATEDTHERMAL

/ SWER within 15 minutes, either:

, 4.1 cr AldI8 S8 V8" II /'## .

Restore the indicated AFD to within ** ebe*grequired' j

target band ifmits, or g p LHh **Q L 9 ic/- d /e -

2. Reduce THERMAL POWER o less a 90% of RATED ERMAL whic r1/ est c edive CTEb Art verp//c d s .
b. With the in cated AF outsitie of the equired target band for more than 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> of cumulative pen 11ty dev f on time,,juring the #((f7,j/g previous 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> or outs fde the Acceptable Operattien Limits of
  • Figure 3.2-1 and with THERMAL POWER less than iWA .but emi
  • a' a greater than 50% of RATED THERMAL POWER, reduce: 0,9 AfffD'"*k tfp /,g//e/g
1. THERMAL POWER to less than 50% of RATED THERMAL POWER [ /r /eer; within 30 minutes, and
2. The Power Range Neutron Flux-His tpoints to less than or equal to 55% of RATED THERMAL POWER within the next 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />.

"See Special Test Exception Specification 3.10.2.

  1. 5 surveillance testing of the Power Range Neutron Flux channel may be performed pursuant to Specification 4.3.1.1 provided the indicated AFD is maintained within the Acceptable Operation Limits of Figure 3.2-1 A total of 16 hours1.851852e-4 days <br />0.00444 hours <br />2.645503e-5 weeks <br />6.088e-6 months <br /> operation may be accumulated with the AFD outside of t e aboveArequired target band during testing without penalty deviation. , //e,f,/,

tt I~n.rer-I' Y -

cud TH ERM Al- POWEA.

) No m

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CALLAWAY - UNIT 1 3/4 2-1 g

      • r a3 // A

P INSERT 3

a. +3%, -12% for Normal Operation

.b. +3% for RESTRICTED AFD OPEPATION INSERT 4

    • APLND is the minimum allowable power' level for RESTRICTED AFD OPERATION and will be provided in the Peaking Factor Limit Report per Specification 6.9.1.9.

A ,

t. .

[*"# A PL "# is ept *> +Le  % N, s- ,_ t' p1 axi mim 2.32

  • kce) k In wer E .m s

l % a3. wc% ,

y i

q and Ff(x) o-J

0.5 (max. over z of 2.32 x K(z) .. 6 p (z) x W(z)Noh )-1 x 100 for P < 0.5 (max. over z of/^2.32 x K(z) 3 i ND*~ J _ Either one of the following actions shall be taken: 2) . m v-v einranr equil!be -d4-+he Miece Jaci n ;cre r r r hr wnditien r r r r^***- m l ilmit " . 2. 2. 2. c is :tet. i; f i ed ;nd :::035""* ., ..A $ [ ' * .ef../OV ~~' d h-;C$mpl[ ith the requirements of specification 50: F3 ( z ) exceeding its limi* by the t t i/rj al M .2.2 :alk lated above, or ,:e::ent o Ver if y tha t the requirements of Specification f.rer g 4. 2. 2. 3 for RESTRICTED AFD OPERATION a ( I .? r 's 3/4 2- - - - - - - - _ _ _ _ _ _ _ _ _ Yg6

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' PCWER DIST?I3CT!ON LIMITS SURVEILLANCE REQUIREMENTS (Continued) 'c. Satisfying the following relationship: E Fg(z) f 2.32* x 'K(z) for P > APL .

  • kAFDO where: . The Fo limit is 2.32.

K(z) is ' Ff(z)~ given is in the Figure measured 3.2-2. g(z) F P . is the reIative THERMAL POW N(z) RAFDO is the cycle dependent function that accounts for limited power distribution ~ transients encountered during RAFDO. This function is given in' the Peaking Factor- Limit Report as per Specification 6.9.1.9.

d. Measuring F (z)' in conjunction with target flux difference determination according to the following schedule:
1. Prior to entering RAFDO af ter satisfying Section 4.2.2.3 unless a full core flux map has been taken in the pr.evious 31 EFPD with the relative for thermal the 24 power having been maintained above APLN3 hours. prior to mapping, and
2. At least once per 31 Effective Full Power Days.
e. With measurements indicating maximum over z bK(z) F5(z)] M has increased since the previous determination of Fd(z) either of.the following actions shall be taken: 1
1. Nj(z) shall be increased by 2 percent over that f 3

specified in 4.2.2.4.c, or

2. f o(z) shall be measured at least once per 7 EFPD j until 2 successive maps indicate that increasing.

maximum c ee: : {- h5(:)-is K(:) .. not

f. With the relatic i -

liied in 4.2.2.4.0 a'-,r' lEhall a no being satisfied -eithe; cf the following acti be taken: , f  : -M i : b . - . . .w

1. .; a ".: :::: :- : r .3 . 1. m --

...d s -gggj;i.,2.'.:-t:-:::i;fi:d, ._---e-._ O 3/4 2- ._ _______-___ ___ - _ __ _ , \ i POWER DISTRIBUTION LIMITS SURVEILLANCE REQUIREMENTS (Continued) ,r<'t - yh- Comply with the requirements of Specification 3.2.2 for Fn(z) exceeding its limit by the percent calcuIated with the following expression: ED h5(z) x W(z)RAppo ) -1 x 100 for P > APL (max. over z of 2. 3 2_ X K (z) - 2 g. The limits specified in 4.2.2. 4.c, 4.2.2. 4.e , and 4.2.2.4,f above are not applicable in the following core plane regions:

1. Lower core region from 0 to 15 percent, inclusive.

inclusive.

2. Upper core region from 85 to 100 percent, is measured for reasons other than meeting 4.2.2.5 When Eg (z)the requirements of Specification 4.2.2.2 or 4.2.2.4, an overall measured Eg (z) shall be obtained from a power distribution map and increased by 3% to account for manufacturing tolerances and further increased by 5% to accountfor,measurempntuncertainty.

INSERT 6 g Margin between the safety analysis DNER limits (1.42 and 1.45 for

  • the opti=ized fuel thimble and typical cells, respectively, and 1.61 and 1.69 for the VANTAGE 5 thimble and typical cells) and the design DN3R limits (1.32 and 1.34 fer the Cpti=ized fuel thimble and typical cells and 1.32 and 1.33 for the VANTAGE 5 thimble and typical cells, respectively) is maintained. A fraction of this =argin is utili:ed to acco==edate the transition core DN3R penalty (21 for Optisi ed fuel, lit for VANTAGE 5 f uel) and the appropriate fuel rod bev DNBR penalty (less than 1.5% per WCAP-8691, Fev. 1) . ':he margin between design and safety .

analysis DNER limits of 7% for Cptimized fuel and 18% for VANTAGE 5 fuel includes greater than 3% margin for optimized fuel and greater than 5% margin for VANTAGE 5 fuel for plant design l- flexibility. (z) is =casured periodically and The increased hot channel by a cycle f actor andI*] height dependent power factor appropriate to either Normal Operation or RESTRICTED AFD CPERATION, W(:)NO Cf WI )PAFDO, to provide assurance that the limit on the het channel factor, Fo ( s ) , is =et. W(:) no accounts for the effects of normal operation transients and was determined from exeected ccwer control maneuvers over .the full range of burnup 'conditiens in the core. W (2) narco accounts for the more restrictive ocerating limits required by RESTRIC ED AFD OPERATION which result in less severe transient values. The W ( z) functions are provided in the Peaking Factor Limit Report per Specification 6.9.1.9. yq, , y~ g - , gy , Prov>vc<r to accou,,+ for ile pcas;!aility o4 olec<wser) in m oroj n +o tLe Fa 0 ) /:n a dvriv e3 in +e r va h j b e km w r veiHoe c e s are p ro vided. A ny dec re a.se in & minim um ma ,3 ., i to 14e Fa M L i+ c o~ pared /) f' ic> the m i n i , , v i., mor3 in cle +e r m ; m e d from tL c. *> pre vious +/vx mop is de +erned y comp o % The ') b ra +io o4- < i 'T m o x, - ( F[(z) ) <) \ ) \ ove < z L K CE) ) . +o Ve n tron Me curre n 4 m ap io tie eme ro'io from , i il,e p reviov S m u P. & rahoS n te c m ,o a re d ( w %c l ) Lo fin m op a do r, o + h e ed +o be ca lc dated c& i ( ider+ico I z /c> co. No ns . I,,c easeu ? +hs rom o ind;cate l +k+ tie m in i.m u m mar 9 r, i +o & Fa (a.) lim + ha.s , decreased and St Gdcl>fionc.) p d n dirJ m.s+ he apfr) ! b de mec s ued Pa (d to occoun fo r h< der decres) i,, margin Hot covId occn be kre 14e n e >cr ' S V t' v c ilIG ,, rc , Note {r eq uen f s ur veiUo n cr* J mof olJo be kr ike owo/unp//~g S v b.s-liivitck eA ddI+io n p . na l Hy a _ -

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