ML20012B509

Forwards Brief Description of Objectives of Peer Group Study & Preliminary Groupings of GE NSSS Units.Meeting W/Bwr Owners Group Scram Frequency Reduction Subcommittee on Topic Scheduled for 900308

ML20012B509
Person / Time
Issue date:	02/28/1990
From:	Hickman D NRC OFFICE FOR ANALYSIS & EVALUATION OF OPERATIONAL DATA (AEOD)
To:	Floyd S CAROLINA POWER & LIGHT CO.
Shared Package
ML20012B508	List: ML20012B507 ML20012B509
References
NUDOCS 9003150150
Download: ML20012B509 (10)

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Mr.: Steve Floyd-Carolina Power and Light Co.

P.O. Box 1551 OHS 7 Raleigh, NC 27602

Dear. Mr. Floyd:

1The enclosure provides a brief description of the objective of the peer group study and our preliminary groupings of General Electric NSSS units. We have.

reserved Thursday, March-8,'1990, to meet with the BWROG scram frequency reduction subcomittee on this topic. Thank you for your assistance in this matter.

Sine rel,

E Donald E. Hickman, Chief Performance Indicator Section Division of Safety Programs Office for Analysis and Evaluation of Operational Data Distribution:

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Table 4.4 General Electric Units with BWR/2, BWR/3 and BWR/4 NSSSs Operating CommercW kohltest furtnne BWR 3gg Mt. jffg.lf,fg JJstenp Operation Ennineer Gene'ator 2np Ma$

D'S Rock Point 166 240 78 08/30/62 03/29/63 BECH GE 0

trewns Ferry 1 260 3293 1006 12/20#3 06/0104 TVA GE 4

i erowns Ferry 2 200 3293 1W4 06/02#4 03/0105 TVA GE 4

l trowns Ferry 3 Ret 3293 1Du$

08/14R6 03/0187 TVA GE 4

i arunew.ok t sa6 243s att 11/12ns 03/14#7 UE&C GE 4

1 trunewick 2 324 2438 tri 12/27 # 4 11/03#6 UE&C OE 4

i Cooper Station 298 tatt 774 01/18#4 07/01#4 B&R WE 4

1 Dresden 2 237 2627 794 12/22/00 06/09/70 S&L GE 3

1 Dreseen 3 249 2627 794 03/02B1 11/16R1 S&L GE 3

1 Duane knoid 331 1964 Sat 02/2204 0t/01#5 DECH OE 4

I Enrico Fermi 2 M1 Satt 1003 07/16/06 01/23/88 DEC GEC 4

I l'Itapatrick 333 2438 ett 10/17F4 07/26#5 S&W OE 4

i Hatch 1 321 2436 776 10/13#4 it/31R6 SSI/SECH QE 4

i Holoh 2 388 2438 TM 06/13F4 09/06/79 BECH OE 4

i Hope Creek 1 364 3293 1067 07/26/86 12/20/06 BECH GE 4

I (Jmerick 1 362 3293 1086 06/08/86 02/01/06 BECH GE 4

I Umorick 2 363 3293 1086 01/08/90 BECH GE 4

N Millstone Pt, int 1 246 2011 000 10/26#0 03/01#1 EBASCO GE 3

i Montloello 263 1670 646 01/09/81 06/30#1 BECH GE 3

i Nine Mile Point 1 22 0 1890 620 12/26#4 12/01/00 NMP GE a

i Oyster Creek.

219 1930 000 08/01/09 12/C1/00 S&R/GE GE 2

l Peach Bottom 2 277 3293 1005 12/14#3 07/06#4 BECH GE 4

i Peach Bottom 3 278 3293 1006 07/02R4 it/23R4 BECH GE 4

i PIL9 tim 1 293 1906 686 09/16#2 12/01#2 BECH GE 3

I Quad Cities 1 264 allt 700 12/14F2 02/18F3 S&L GE 3

i Ouad Oties 2 266 2611 700 12/14F2 03/10#3 S&L GE 3

i Shoreham 322 2436 819 07/03/66 S&W GE 4

R Susquehanna 1 387 3293 1006 11/12/42 06/04/63 BECH GE 4

g Susquehanna 2 384 3293 1086 06/27/M 02/12/06 isECH GE 4

N Vermont Yankee 271 1693 514 02/28R3 11/30#2 EBASCO GE 4

I Yable4.5 General Electric Units with BWR/S and BWR/6 NSSSs Operating Commercial kohltest Turbine BWR ganj j)gghg jg jgp M

Operation Enninner Generatgf 9333, Wag Qinton 1 461 tem 933 04/17/47 11/24/07 S&L GE 4

m Orand Gulf 1 416 3033 1880 11/01/M 07/01/86 SECH AC 8

m La Salle 1 373 3333 1078 08/1VSR 01/01/M S&L OE e

La Salle 2 374 3323 1078 03/23/M 10/19/M S&L OE g

Nine Mile Point t 410 3323 1000 07/02/87 S&W OE 5

I Perry 1 440 3679 titt 11/13/06 11/14/87 GIL GE S

e fever tend 1 ans se9e 93s 11/20/s6 06/16/es S&W OE e

a Weehington NP t 307 3323 1100 04/13/64 12/13/84 B&R WE 5

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i APPENDlX A Design Information used to Establish Preliminary Peer Groups t

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aluceder UNIT Unit Number MWT Reted thermal CRC _ TYPE

' Type d dre weser MWE Electical Rosing ousput asmur Soweedomeweser LOWPOWDATE Date low power CPC UWees dgleaf Core mahoup Boones was loomed Protection CRC _GPM Clem weser saw same i

FUt.POWDATE Deee fue power Sooneeweeisewed ICS LA$res inespeted i.

Central System CRC _UT Circuleeing water syseem esemnetet FIRST_ELEC Dete of fitat tenweemse elecericalgenesuelon OTSG Utilizes Once Through Steem l

CODATE Com mercIeI Generosers TOWERS Mundser of eessug towers opesaden date OLDATE Date operating

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Numiser of W PWR LOOPS Isops SHMED Munter of easts shedng towere sooneew MMWC BWR containment TYPE Type of essens j

OL_EXPWIE Date operating type towere l

liconee epipes CLASS SWR dass ST_0MP_ CAP Steem d a se p CPDATE Does consswegen empoolir pomdt teamed RK_ PRES Rescsor pmeewe TYPE Type ef MSSS HEAT _FLUK Heat tet 8VPRSS_ CAP Steem bypeos capsedly NSSS NSSSvender MAX KWFT Meenum tumr hem genoegen sene F_8UfGL Munter of Guel temens l

DoCMET Dodet nunter ENRICHRENT Fust enrichment j

C_ ROOS Munter of conto RGN NRC reglen sode SURNUP Fuel Sumuy COND_COOUt UC Ucensee U_WT Uranium weight CITY Car U02 WT Utenium Ontdo

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Background

On March 15, 1989, the Nuclear Regulatory Commission approved the adoption of cause codes extracted from Licensee Event Report (LER) data as a new s

performanceindicator(PI). The staff subsequently proposed displays for the i

cause code data that included a graph showing cause code data compared with the average cause codes for units having the same Nuclear Steam Supply System (NSSS) vendor (industry average). The Consnission, prior to approval of this display, directed the staff to address the comparability of LER data I

between licensees.

i This project addresses the comissioners' concern regarding the desirability oc

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appropriateness of comparing cause code data derived from LERs between licensees on a global basis, recognizing that substantial differences may i

exist in plants even of the same NSSS design. The issue is to determine if t

groups of similar plants (peer groups) can be established so that direct i

comparisons of plant performance can be made based upon sound technical considerations.

E The objective of this aroject is to construct groupings of plants based upon design similarities.

Seer plant groupings based upon design considerations t

will be used to present PI data for each plant compared with similar plants.

-Such groupings should support evaluations of individual plants relative to others in their peer groups and of peer groups relative to each other, Based on our statistical analysis considering the intended use of the " peer group" data, we have determined that peer groups with six or more plants will have relatively equal length confidence intervals. Therefore, peer groups should have six or more plants. This assumes that all the plants in a peer group are. consistent in terms of averages and standard deviations.

Inconsistencies among the plants in a peer group would dictate larger peer group sizes. How much larger is dependent upon the inconsistencies.

Design Factors A detailed study of every design parameter for each operating reactor would conclude that no two plants are identical, and therefore any effort to group them at this level would ultimately result in only one plant per peer group, I

i Design parameters used to define peer groups for this study were of a more general or broad-based level so that several plants would satisfy the group i

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I criteria. Examples of broad-based design characteristics conanon to multiple r

plants include:

(1) NSS vendor. The NSSSs for all operating units are su) plied by either Babcock and Wilcox, Combustion Engineering, General

lectric or Westinghouse.

Each vendor has employed varying design concepts resulting in four distinct types of nuclear plants. Each has its own operational characteristics.

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(2) Product line. For a particular NSS$ vendor, different generic designs (or product lines or vintages) have evolved over the years.

These product lines represent changes in major design parameters j

such as rated thermal output, number of coolant loops, contain'nent design, and control or protection system technology. The changes from one product line to the next were generally of a significant l

enough magnitude that an effect on operational characteristics would be expected.

(3) Age-Another measure of plant design relates to the age of the plant l

as measured in years of commercial operation, year ordered, date of construction permit, date of operating license, year of intended operation. date of initial critcality, etc. This measure, also closely tied with product line or vintage, is not as technically based as those mentioned previously; however, it is an indicator of overall plant complexity which can have a significant impact on plant operational characteristics.

Peer Groups (Preliminary)

All of the nuclear units in the United States which are currently licensed or expected to operate have been assigned to one of eight preliminary peer groups. The preliminary groups were constructed after careful consideration of design related information, minimum acceptable peer group sizes from a statistical perspective, and the unique features of several plants. The General Electric grouping is discussed in this section. The design information which formed the basis for many of the peer group assignments is given in Appendix A.

General Electric Peer Groups,

-Thereare38GeneralElectric(GE)NSSSunitswithoperatinglicenseslocated at 27 different sites. Three major design characteristics of the GE NSSS offer valid consideration for peer group definition. These are: l} reactor class, 2) containment class, and 3) type of recirculation control.

[ Preliminary breakdowns of the BWRs focused on the BWR type or model as an indicatorofmajordesignfeaturesandvintage.) Two issues complicated these initial breakdowns.

First, there are only two BWR/2s and only four each of the BWR/5s and BWR/6s.

Peer groups of this size do not permit analyses of data to be performed at desired confidence limits.

Second, the implementation of major design changes, such as those affecting containment type, emergency core cooling systems, and method of power control (recirculation flow control), did not occur coincident with model changes.

A second approach was then attempted based upon containment type. The number of plants with a Mark I containment was relatively large (24). The number with a Mark Il containment was sufficient (9). The number of plants with a Mark Ill containment was not sufficient (4).

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' j A third approach was based upon the method of power control (recirculation i

flowcontrol). The BWR/2s, BWR/35, and BWR/4s use motor generator sets i

driving variable speed recirculation purrps while the BWR/5s and BWR/6s control recirculation flow through the use of flow control valves. There are 30 plants which use the variable speed recirculation pumps and 8 plants which use the flow control valves. The size of both of these groupings is adequate.

The actual construction of the peer groups for the BWRs was based on the design features of the various BWR models. The groups which were deter-mined to best satisfy the various considerations were (1) the BWR/2s, BWR/3s, i

and BWR/4s and (2) the BWR/5s and BWR/65. Each of these groupings is dis-cussed below.

BWR/2, BWR/3. and BWR/4 NSSS. This group contains the 30 plants shown in Table 4.4 Several plants have been included in this group that differ from the majority. Big Rock Point, Oyster Creek and Nine Mile Point 1 l

are very early vintage BWRs with significant design differences from the remainder of the group.

It is recognized that these three plants are better suited in a separate group, however this would result in one group of three plants - smaller than the minimum group size recommended for maintaining high confidence limits on group data.

BWR/5 and BWR/6 NSSS. This group contains the 8 plants shown in Table 1.5.

The BWR/5 and 6 product lines were combined in this case in order to achieve.a peer group containing more than four plants.

No exceptions were made to this group.

Interview Objectives The objectives of'the interview are to (1) determine whether organizations have already addressed.the issue of comparing plants based upon design factors and (2) obtain their input on the proposed groupings based primarily on design factors. More specifically, (1) Would it be reasonable to assume that all GE plants would perform similarly, if all other factors were the same for each plant?

(2) Would product evolution, certain design features, complexity, etc.

j render such a grouping unreasonable?

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- If so, would structuring of peer groups based on design class or vintage satisfactorily address these concerns?

- If not, then what peer groupings would be most appropriate?

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l Table 4 4 General Electric Units with BWR/2, BWR/3 and BWR/4 NSSSs j

Operatine Commercial Achitect furtnne BWR Eggt Doc 6et M -IMe Utenes hf1!20 Ermineer

@ne'ater MM Sig Rock Point 166 240 73 08/30/62 03/29/63 BECH GE 0

Stowns Ferry 1 260 3293 1006 12/20#3 08/0t#4 TVA GE 4

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Browne Ferr/ 2 200 3293 1006 06/02/14 03/01/F5 TVA GE 4

I trowns Ferry 3 ISS 3203 1005 08/18/?$

03/01/77 TVA OE 4

i erunews t 326 2438 til 11/12/76 03/14/77 UE&C OE 4

1 Grunewook 2 324 3438 tri 12/27/14 11/03#6 UE&C OE 4

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Cooper Stat 6on as3 23s1 Tre 01/1804 07/01/r4 a&R WE 4

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Dresden 2 237 2627 794 12/22/00 06/09/70 S&L GE 3

1 Dresden 3 tot 2S27 794 03/02/71 11/16#1 S&L '

GE 3

i Duane knoid 331 1984 638 02/22/74 02/01/75 BECH OE 4

1 Enrico Fermi 2 M1 3292 1003 07/16/48 01/23/08 DEC GEC 4

i Fitspetrick 333 2436 St1 10/17#4 07/24#5 S&W OE 4

i Hetch 1 321 2434 TFS 10/13/74 12/31 # 5 SSI/8ECH OE 4

i Hatch a 308 2438 7M 06/13#8 09/06/79 BECH OE 4

i Hope Creek 1 3M 3293 1067 07/26/06 12/20/06 BECH GE 4

i Umerick 1 362 3293. 1086 ' 06/08/06 02/01/08 BECH GE 4

I Umerick 2 363 3293 1066 01/08/90 SECH GE 4

R Mihstone Point 1 246 2011 000 10/26/70 03/01#1 ESA800 GE 3

1 Montleehe 263 1670 M6 01/09/81 06/30/71 SECH GE 3

i Nine Mile Point 1 220 1850 620 12/26/74 12/01/00 Nh4P GE 3

l Oyster Creek 219 1930 000 06/01/69 12/01/09 B&R/GE GE 2

i Peach Bottom 2 277 3293 1085 12/14#3 07/06#4 BECH GE 4

i Peach Bottom 3 278 3293 1066 07/02#4 12/23#4 BECH GE 4

i Pilgrim 1 293 1998 666 09/16/72 12/01#2 BECH GE 3

1 Quad Oties 1 2H 2611 780 12/14#2 02/18#3 S&L GE 3

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Ouad Oties 2 266 2611 780 12/14#2 03/10#3 S&L GE 3

i Shoreham 322 2436 Bit 07/03/46 S&W GE 4

8 Susquehanna 1 387 3293 1066 11/12/42 06/06/63 BECH GE 4

g Svoquehanna 3 368 3293 1066 06/27/M 02/12/06 BECH GE 4

I Vermont Yankee 271 1603 814 02/28/73 11/30#2 E8ASCO GE 4

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Tabl9 4.5 General Electric Units with BWR/S and BWR/6 NSSSs Operatine Commercial kohttest furtaine BWR l

S&W AgehW M j69 Mggage Operaten Erminaar Generator

. gage jdag Ointon 1 461 2004 ~ 933 04/17/47 11/24/87 S&L GE 8

m Grand Gott 1 41s seas isso 11/01/H 07/01/06 BECH AC e

a La Salle 1 373 3323 1078 08/12/42 01/01/04 S&L GE 5

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. 314 3323 1078 03/23/M 10/19/M S&L GE 5

5 Nine Mile Point 2 410 3323 1000 07/02/87 S&W OE 5

I Perry 1 440 3679 1191 11/13/06 11/18/87 OIL GE 6

g River Bond 1 458 2694 938 11/20/88 06/16/06 S&W OE e

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- Woohington NP t 307 3323 1100 04/13/M 11/13/M B&R WE S

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i CODATE ComaercIeI ges,ess PWR_ LOOPS Number W cosient e,

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l OLDATE Dete operating k' ope one,q,,, is.e,e BAARK BWR conesinmem TYPE Type of esseng l

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CPDATE Dese constocdon Steem dump ST DasP CAP p.,,eiss ed RX_ PRES Reactor preneuse espedsy m

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