ML18067A462

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Summary of 960925 Meeting W/Util in Rockville,Md Re Proposed Rev to Pidal in-core Monitoring Code.List of Attendees Encl
ML18067A462
Person / Time
Site: Palisades 
Issue date: 04/01/1997
From: Robert Schaaf
NRC (Affiliation Not Assigned)
To:
NRC (Affiliation Not Assigned)
References
NUDOCS 9704030087
Download: ML18067A462 (26)
v • d • e


Text

LICENSEE:

  • Consumers Power Company FACILITY-: -

Palisades Nuclear Plant April 1, 1997 *

SUBJECT:

MEETING WITH CONSUMERS POWER COMPANY TO DISCUSS PIDAL_IN-CORE MONITORING CODE A meeting was held at NRC Headquarters on September 25, 1996, between Consumers Power Company and the NRC to discuss the licensee's proposed revision to the PIDAL in-core monitoring code used at the Palisades plant.

A list of attendees is provided in-.Attach~entl.

The PIDAL code was originally approved by the NRC for licensee use on April 3, -

1992.

The licensee indicated in its August 6, 1996~ submittal that the revised code will improve modeling accuracy for the low leakage core designs currently used at Palisades and will provide a tool for monitoring large quadrant power tilts. The licensee presented an overview of the proposed changes, and discussed related tethnical specification surveillance requirements, uncertainty analyses chariges, and c6mparisons of the revised code to the currently accepted code to demonstrate the* accuracy of the revised methodology. - The licensee's presentation materials are provided in.

During the meeting, the staff reviewer requested that the licensee provide information showing the change in predicted rhodium depletion rates from the existing to the proposed methodologies.

Th~ licensee provi~ed the requested information in a letter dated October 9, 1996:

Completion of this meeting documentation was delayed due to project management resource impacts associ~ted with higher priority licensing actions and activities~ such as licensee performance assessment activities and completion of refueling outage related license amendments.

If there are any questions regarding the information presented in this meetjng. summary, please contact Robert Schaaf at (301) 415-1312.

Docket No. 50-255 Attachments:

As.stated (2) cc w/att: See next page Original signed by Robert Schaaf, Project Manager Project Directorate 111-1 Division of Reactor Projects - 111/IV Office of *Nuclear Reacfor Regul at i o-n ----

DOCUMENT NAME: G:\\WPDOCS\\PALISADE\\PA960925.MTS To receive a* copy of this doc1.111ent, indicate in the box C=C y w/o attachment/enclosure E=Copy with attachment/enclosure N =

No co y OFFICE LA:PD31 -

NAME DATE I 030014 -

' 9704030087 970401

- - ---~DR ADOCK. osoo~g~s j

Consumers Po~er Company.

\\

. cc:.

Mr. Thomas J. Palmisano Plant General. Manager Palisades Plant 27780 Blue Star Memorial Highway Covert, Michigan 49043 Mr. R.obert A. -*Fenech

  • Vice President, Nuclear Operations Palisades Plant 27780 Blue Star Memorial Hi~hway Covert,- Michigan* 49043 M. I. Miller~ E~quire Sidley & Austin 54th Floor

-One *ftrst National Plaza

Chicago, lllinoi~ 60603 Mr. Thomas A. McNish
  • Vice President & Secretary

-Consumers Power Company*

. 212*west Michigan Avenue

  • Jackson, Michigan_

~9201 Judd L.

Baco~, fsquire Consumers Power Company 212 W~st Michig~n:Avenu~

Jackson, Mi~higan 492bl

-: Regional Admini$tr*tor, Regio~ III.

  • U.S.. Nuclear*'Regulatory Commission 801 W~rrenville.Road Lisle, Illinois 60532-4351

. *Jerry Sarno

~ Tow_ns_hjp_ Supervisor

  • . Covert Township

'36197 M-140 Hi*ghway*

Covert, Michigan 49043.

Office of the Governor

  • Room 1 - Capitol Building Lansing, Michig~n _48913 *
  • U.S. Nuclear Regulatory Commission Resident Inspector's Office Palisades Plant
  • 27782 Blue Star Memorial Highway Covert, Michigan 49043 Palisades Plant Drinking Water and Radiological Protection Division
  • Michigan Department of Environmental Quality 3423 N. Martin Luther King Jr Blvd P. 0. Box 30630.CPH Mailroom Lansing, Michigan 48909-8130 Gerald Charnoff, Esquire*

Shaw, Pittman, Potts and Trowbridge

  • 2300 N Street;N. W.

Washington DC 20037 Michigan Department of Attorney General-Special Litigation Division*

630 Law Building P.O. Box 30212 Lansing, Michigan *48909 Mr. *.rhomas C. *sardine*

Manager Licensing Palisades Plant

-27780 Blue Star Memori a 1 Hwy.

Covert,.Michigan 49043 Febtuary 1997

y MEETING ATTENDANCE MEETING WITH CONSUMERS POWER COMPANY TO DISCUSS* ucENSING ISSUES September 25, 1996 NAME Thomas Berdine Robert Vincent Al Williams Tim Altenau Ross Snuggerud Linh Tran

. George Schwenck AFFILIATION CPCo CPCo CPCo CPCo CPCo NRC NRR ATTACHMENT 1

r s-e*

PIDAL-3 1 ~

sumers Power Company - Palisades

  • Summa~ze PIDAL-3 Methodology Summarize the PIDAL-~ l.!ncertainty An.alysis
  • Explain* Differences Between the
  • p10AL-2 and PIDAL.:.3 versions *
  • Pro.vide *comparisons Between the.

PIDAL-2 and PIDAL-3 vers;ons ATTACHMENT 2 1

B CKGROUND Palisades is an ABBCE 2-Loop PWR

  • 2530MWTh 204 Fuel Assem/;Jlies (Siemens)
  • 45 Cruciform Control Blades
  • 43 Rhodium IC/s with 5 Detectors per instrument (Reuter - Stokes) umers PcTwer cOmpany
  • Palisades IAL EVOLUTION Eighth Core INCA (ABBCE)
  • Utilized during the firSt 9 cycles

.___ Full Core PIDAL

  • Licensed and Implemented in Cycle* 1 o.
  • Utilizes Quarter Core PDQIXTG
  • Allows for Low Leakage Core Patterns with

. Increased C}'cle Length 2

y,

~L EVOLUTION Full Core PIDAL-2

  • Implemented in Cycle 12 under 50. 59
  • . :Modified PIDAL to Interface with the New
  • plant Process.Computer (PPC).
  • Increased XTG. Model from 12 to 25 Axial Nodes to allow for 5. *21~ Axial Blankets *.
  • Ufr!9'S Power company* Palisades

~L EVOLUTION..

rzt~rzue4)....

Full Core PIDAL-3

  • Proposed Implementation in Cycle. 13

.**Replaces PD(;11XTG with s*IMU~*TE-3.

Rhodium Reaction Rates, Pin~to-Box

    • Factors & Nodal Powers* *. ** *.
  • .
  • Provides Accurate lncore *Monitoring for
  • .Quadrant Power Tilts up to 5%
  • ..
  • No Tech Spec Changes are Required
  • 3 l
  • T

- t Data Collection Theoretical Detector Power Calculation

  • Measured Detector Power Calculation
  • Radial.Power Distribution Calculation.
  • Axial Power Distribution Calculation
  • Technical Specification Surveillance.

umers Prmer Company* Palisades D" t"TA COLLECTION I PPC Responsibilities:

  • Supplies All Plant Data.
  • *. C~rrects Background and Converts.
  • Detector Signal from amps to nv
  • . Updates Detector Sensitivities using

~

5_ta.rJdard ABBCE Linear Depletion La.w :

  • SIMULA TE-3 Rep~nsibilities:
  • Supplies the 3D Rhodium Reaction Rates, Pin-to-Box Factors & Nodal Powers Power Company. Pellsades 4

PIDAL-2 imports Quarter Core 2D PDQ W-primes and Pin-to;..Box *Factors, an(J 3D XTG Nodal Powers.

  • PIDAL-3 imports Full Core 3D SIMULATE-3 Rhodium Reaction Rates, Pin-to-Box Factors & Nodal Powers.

U"l8fS ~

eompany

  • Pal/sades 7: EORETlCAL*'DETECTOR

.P WERCALC J

~~-:

  • .*.. 'pe(form Least Squares Fit' oi

.... SIMULATE-3 Nodal Powers '(204x25):

~

,..__,..... ~ Five Mode Fourier Series.

  • Iterate on Increasing Apparent *core 'Height
  • *until ~he lowest Square Sum !:"or is found
  • Save Theoretical Boundary-Conditions for.
  • Axial Power Distribution Calculation
  • Integrate over each Detector Level to yield Theoretical Detector Powers 5

T C

NGES TO THEORETICAL D TECTOR-POWER CALC PIDAL-2 uses Quarter Core XTG Nodal Powers

'-------=' PIDAL uses Full Core SIMULA TE-3 Nodal Powers umers Pow8r Company* Palisades

-'ASURED DETECTOR * -

WER-CALC,

Depleting. Detector signal must be -

correcteq for Rhodiµm Depletion* and Self-Shielding b

  • CASM0~3/SIMULATE~3 assurhes*a Non-depleting R~odium Detector Mode/,_ therefore, Self-Shielding must be corrected external to SIMULA TE-3 6

ASURED DETECTOR WER CALC (Continued)

Correct for Rhodium Depletion with the PPG Detector Sensitivity Updates

~

Correct for Self Shielding with Methodology Developed by Southern California Edison

  • Self-Shielding Factors are ratios of Depleted to Non-Depleted Rhodium Reaction Rates umers Power Company
  • Palisades ASURED DETECTOR WER CALC (Continued) 7

C NGES TO MEASURED D TECTOR POWER CALC PIDAL-2 uses Pre-Determined Quarter Core 2D PDQ W-prime Library with no temperature feedback for ARO and Group 4 Inserted

  • PIDAL-3 Uses On-Demand Full Core 3D SIMULA TE-3 Rhodium Reaction Rates Available at Any Power Level and Control Rod Configuration umers Power Cofr¥>any - Palisades DIAL POWER D TRIBUTIONCALC Based on ABBCE CECOR Methodology CECOR uses Pre-Determined Coupling Coefficients Based on Theoretical Detector Powers Only
  • PIDAL Calculates Theoretical Coupling Coefficients, Incorporates Measured Detector Powers, and Recalculates Measured/Inferred Coupling Coefficients B

y

~.,

I.

4.

NGES TO RADIAL POWER.

TRIBUTIONCALC.

PIDAL-2* uses Quarter Core )CTG

  • Detector Powers L----...=' PIDAL-3 uses Full.Core $1MULATE-3
  • Detector Powers

~mers Power.Company-P_a/lsades.

L:POWER

  • TR/BUT/ON CALC*.

_ Apply a Five Mode *Fourier Fit to the 5 l

Detector Powers and Theoretical BCs.

  • Use Gauss Elimination to solve the 5 equations for the 5 unkn.own coefficient~

.. that* represent the.Axial Power Distnbution

  • Generate 51 ~ial Point Powers
  • Collapse to 25 Axial Nodal Powef-s
  • Collapse to 2D Radial and 1 D AXial Power Distributions 9

NGES TO AXIAL.POWER TRIBUTION CALC PIDAL-2 uses Measured/Inferred Detector Powers and Theoretical BCs fromXTG

  • PlbAL-3 uses Mei1sured/lnferred Detector Powers and Theoretical BCs

.from SIMULATE-3 umers Power Company* Palisades

  • r: CHNICAL SPECIFICATION S RVEILLANCE.

Axial Offset

  • Allowable Power Level **

Quadrant Power Tilt ii LHGR and Radial Peaking.Factors*

  • lncore Alarm Setpoints

~* lncore Operability*

  • Excore Calibration

. 10

y

  • _T. CHNICAL SPECIFICATION S RVEILLANCE.(Continued)

Two Different Radial Peaking Factors:

I

  • F,t -Assembly Radial Peaking Factor

- Max ratio of the individual fuel assembly power

. to the core average ass_embly power integrated over the total core height, including tilt

  • .FR7 *-Total Radial peakin_g Fabtor _ "*

~Max ratio ofthe individual fuel pin power to the c0re 'a'verage pin powerintegr~'ted over the

.. total c6re height; including tilt*

umers PcYNer Company - Pa/lsBdes C

NGES TO TECl!.:SP EC

-S RVEILLANCE:..-_.

PIDAL-3_/ncorpora.te*s a:Pinratio into1 *.

the FR r Equation FRT = RPD x LPF FRT = FRA.~ A"I Nu1J1b1rofpin1 in us11J1b/y x LPF Nu1J1b1r ofpini in ou11J1b/y FRT =

Au1Mbly Pow1r x AYI N11Mb1r'o/pin1 in ourn1biy x LPF

,,.., AUllflbly Pow1r Nulflblr ofpini in OUllflb/y FR T = Avr Pin Pow1r in ou11J1b/y x P1ok Pin Pow1r Av1 Pin Pow1r in corr Av1 Pin Pow1r in IUUlflbly FR T "

Puk Pin Pow*r Avr Pin Pow1r in corr 11

T e

e SlJMMARY OF P IDAL-3 CERTAIN'I'Y ANALYSIS Siemens Methodology Three TS Uncertainties:

  • FRA = FSA* FR'
  • F_RT= FsA* FR* FL*

. F - F *F *F *F Q -

. S R

z*

L

  • FL Uncertainty Component represents *
the. Pin.~to-Box Uncertainty calculated with the B&W Critical Experiments
  • umers Power Company - Palisades

~LYSIS (Continued)

Effects on Final Uncertainties

  • Low' Leakage *cores
  • *. Poolability and.Normality of Data
  • Failing ~arge Numbers of lncore. Detectors * *
  • Radial Power Tilts

.* Large Axial Offsets torbumens Power COlr¥>BnY

  • PalJsad8s I

12

y W LEAKAGE COJ[f:S**

, Produce Higher,Percent Deviations Due to Assemblies with RPFs.<< 1.0 *

~TS Only Concerned with RPFs >, 1.0, therefore, eliminating RPFs < 1. 0.from Uncertainty-Analysis* produces a repr~sentative *uncertainty that is*.

conservative for Pe~k As~emblies

  • Foll9~s OPPD Methodology umers Pawer Company-Palisades

. P - OlABILIIT & NOiwA:LIIT.

BARTLETT Test used for Pao/ability

  • and W Test us_~d-for Norrnality--check-Conservatively used data every 1000
  • MWDs to Improve. Independence and Lower Degrees, of Freedom
  • Data Shows Normal Distribution about**;*.

. Mean and Pao/ability within each Cycle but

    • hot Across Cycles

,

  • Follows OPPD Methodology *

~Ir.

13

y F /LING LARGE NUMBERS 0 'DETECTORS Current Technical Specifications Require 75% Operability with 2 Detectors per Level per Quadrant

  • Analysis Randomly Fails 11 Detector Strings (25%) in addition to RPFs < 1. 0
  • Much smaller Effect on Uncertainties since the assemblies with the Lowest Power (Highest Percent.Deviations) are eliminated due to RPFs < 1 :o umers Power Company - Pa/kiades RGE RAD/AL. POWER TIL.TS Current Tf!c.hnical Specifications

. Require Increased Uncertainties for QPTs Between 2.8 & 5.0%

  • . ~ This is due to. Quarter Core PbQIXTG Models
  • PIDAL-3 uses Full Core SIMULA TE-3 Model which *shows no effect on Uncertainties with QPTs up to 5%

'~

14

J *

. RGE AXIAL OFFSETS PIDAL-3 when lmple_mented on the P.PC has the Ability to Closely Monitor Transients (15 Minute Intervals)

    • SIMULA TE-3 has* the Ability* to Handle**
  • Small Time -'Steps to Accurately.Mode/.

Transients

~18tll Power Conflany

  • PBl/sades B W. CRITICAL.

I'ERIMENTS*..

Performed SIMULATE-3 Benchmarking

  • . Against Industry Standard Critical Experiments
  • 6 Cores (3 Gad and 3 Non-Gad) *
  • . Good agreement aroqnd -water holes
  • 1 Node perAssembly Yields Higher Uncertainty than 2x2 Calculation
  • **Gad Cores Show.Higher Uncertainty than
  • Non-Gad 15

T WCRITICAL ERIMENTS (Continued)

Therefore, PIDAL-3 FL Uncertainty (0.0163) is Higher than PDQ (0.01.35) and Higher than* other industry.

SIMULATE:.3 methodologies which use

. 2x2 calculation 4otPU1illefS Prtwer eon.>any

  • Pal/sades C MPARISONS PIDAL-2 ITO.. PIDAL4 '"* A*u*blr ****** **** c, ****

ewD*TU 16

C MP ARISONS (Continued) l I Umetll ~Company* Palisades

. C MP ARISONS (Con(inuec!)

PIOAL-1 no ~* P.IDAL-1 i-1. *-* ~ hdlal **** Crclt 11 J

  • I.

10 u

GWIMITU 17

T PIDAL*2 XTO YI PIDAL..'I 14 YI l..'I. &*ill OllMI, Cyclt 1*

'o 01

  • o O*.
  • O 02
  • D 04....
  • -0*01
  • O i -------------------------1

.I OWOIMTU C 'MP ARISONS (Continued)

PiD&L-1 XTO YI PID&L4 14 YI I~. A*l1I OllMI, Cyclt 11

-0 02

  • O O*

. *O.DI

PS&O OWD*TU 18

T C *~ARISONS (Continued)

PIDAl.-1 ITO *L PIDAL*..a.1-i *L 14,, *** Cycle.

t'tl,,...

J,.

I 0

OWDIM TU-umers Power eompany

  • Pallsades C. MP A~S(JNS (Co.ntinued).

J.,,

I

.PIDAL-ll.ITQ *L PIDAL..J I.a *LI.a,**&, Cpla II 10 u

. ~\\

19

T C WARISONS (Continued)

I,

I I, "

IU l'IDAL-1.ITO n. l'IDAL-ll 14 oo. 14, PIT, Cycle 11

........ ~~~~~~~~~~~~~~~~~~~~~

umers Power ~ny

  • Palisades

. I OWOlllTU c MP AR/SONS (COlJlinued)

. l'IDAL4 ITO... l'IDAL4 14... l*J, PIT, Cycle 11 20

C 'MPARJSONS (Continued)

  • ~IOAL..a H llMULATl..a, AO, Crcle tt loon Tranolonl OU----------------.

.o ~

0 OS

  • DJS....__ ___________

4 0

  • t*

10 ti *

20.

JS ID '

U

'° 4S

.* 7 Tl*e(Me*U)

  • r mers Power 90fJ'!pany
  • PaJJsades

... rm:::::::::::=============================i

,Methodol~gy Changes; *...

  • .Use SIMULATE.. 3:Rhodiutn Reaction.
  • .**Rates, Pin7trrBox.Factors, a.nd Nodal
  • Power.s instead.ofPDQIXT~,
  • Added.Pin Ratio to fRT Calculation *
  • *
  • instead *of Quarter Core XTG
  • _*)

21

T ruMARY (Continued)

Uncertainty Analysis Changes

  • Increased lfJdependence of Data arid Decrease Degrees of Freedom
  • Eliminated assemblies with RPFs.< 1. o *
  • Pert.armed ln~house Uncertainty Analysis of SIMULA TE-3 Pin R~construction..

umers Power Company* Palisades C~ WCLUSION 1 PIDAL-3 Has Been Validated to Palisades Cycles 9* 11..

  • Direct. Comparisons of-key Parameters *,.

show Good Agreement Between PIDAL-3

,. and PIDAL-2 *

  • SIMl)LA TE-3 Can Accurately.Model Plant Transients and QPTs up to 5. 0%
  • Completed Uncertainty Anaiysis Show$

PIDAL-3 Uncertainties are Bounded by Current Technical Specification

~a"S-Power CotrJ>any. Pallaades

  • )

22

Di stri but ion for Meeting Summary dated: April 1, 1997 HARD COPY Docket' File PUBLIC PD3:--l Readi_ng OGC ACRS E-MAIL S. ~Collins/F. Mi~aglia

.R; Zimmerman J. Roe L Adensam D. Ross (e-mail.to SAM}

L. Tran*

G*. Schwenck B. *McCabe B. Burgess; -RI II

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