ML20198M824

Summary of 970930 Meeting W/Siemens Power Corp in Rockville, MD Re Statistical Setpoint & Transient Methodologies Issues. List of Attendees & Presentation Matl,Encl

ML20198M824
Person / Time
Site:	Framatome ANP Richland
Issue date:	10/21/1997
From:	Wang E NRC (Affiliation Not Assigned)
To:	Essig T NRC (Affiliation Not Assigned)
References
NUDOCS 9710300029
Download: ML20198M824 (35)

Text

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• October-21, 19_97.. ,

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, MEMORANDUM TO: : Thomas H. Essig, Actinq Chief Generic issues and Eqvii inmental Projects Branch Division of Reactor Program Management, NRR FROM: Egan Wang, Reactor Engineer Original Signed By:

Generic Issecs and Environmental Projects Branch Division of Reactor Program Management, NRR

SUMMARY

OF MEETING HELD ON SEPTEMBER 30,1997, WITH SIEMENS TO DISCUSS ISSUES RELATED TO SETPOINT METHODOLOGIES On September 30,1997, the staff held a public meeting with Siemens Power Corporation -

(SPC) at NRC headquaters in Rockville, Maryland to discuss issues related to statistical setpoint and transient methodologies. The purpose of this meeting was to inform the statt of the status of statistical setpoint and transient metnodologies for Westinghouse plants p and Combustion Engineering plants. Attachment 1 lists of meeting participants.

Attachment 2 provides a set of non proprietary slides presented by SPC during the meeting.

As background information, SPC stated that EMF-507 and Supplement 1 and 2 " ENC Setpoint Methodolog for C.E. Reactors: Statistical Setpoint Methodology," was approved by NRC on September 16,1986; and EMF 92 081, and Supplement 1, " Statistical Setpoint/ Transient Methodology for Westinghouse Type Reactors," was approved by NRC in February .994. The purpose of this meeting is for SPC to inform the staff of SPC's effort to (1) automate the setpoint methodology, (2) consolidate setpoint methdologies, and (3) implement attemative solution methods, and unique methodology solution techniques.

SPC presented an implementation outline, implementation basis, and implementation goals.

The goals of implementation are : (1) to develop a complete, formal scheme comforming to approved methodologies; (2) make treatment of Westinghouse and C.E. Plants more similar to allow analysts to use experience with cne plant type on the other; and (3) make the

-process as automated as possible. Most of the material presented at the meeting by SPC was proprietary.

' Attachm' ents: As stated cc: Mr. H. Donald Curet, Manager Product Licensing Siemens Power Corporation 2101 Horn Rapid Road P.O.~ Box 130 Richland, Washington 99352-0130 DISTRIBUTION: See attach page Document name: 970930MT. SUM 'See Previous Concurrences s

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f WASHINGTON. o.C. 2055H001 October 21, 1997 MEMORANDUM TO: Thomas H. Essig, Acting Chief Generic issues and Environmental Projects Branch Division of Reactor Program Management, NRR FROM: Egan Wang, Reactor Engineer M [

Generic issues and Environmental Projects Branch Division of Reactor Program Management, NRR

SUMMARY

OF MEE rlNG HELD ON SEPTEMBER 30,1997, WITH SIEMENS TO DISCUSS ISSUES RELATED TO SETPOINT METHODOLOGIES On September 30,1997, the staff held a public meeting with Siemens Power Corporation (SPC) at NRC headquaters in Rockville, Maryland to discuss issues related to statistical setpoint and transient methodologies. The purpose of this meeting was to inform the staff of the status of statistical setpoint and transient methodologies for Westinghouse plants and Combustion Engineering plants. Attachment 1 lists of meeting participants.

Attachment 2 provides a set of non-proprietary slides presented by SPC during the meeting.

As background information, SPC stated that EMF 507 and Supplement 1 and 2,

• ENC--

Setpoint Methodolog for C.E. Reactors: Statistical Setpoint Methodology," was approved by NRC on September 16,1986; and EMF-92-081, and Supplement 1, " Statistical Setpoint/ Transient Methodology for Westinghoue Type Reactors," was approved by NRC in February 1994. The purpose of this meeting is for SPC to inform the staff of SPC's effort to (1) automate the setpoint methodology, (2) consolidate setpoint methdologies, and (3) implement alternative solution methods, and unique methodology solution techniques.

SPC presented an implementation outline, implementation basis, and implementation goals.

The goals of implementation are : (1) to develop a complete, formal scheme comforming to approved methodologies; (2) make treatment of Westinghouse and C.E. Plants more similar to allow analysts to use experience with one plant type on the other; and (3) make the process as automated as possible. Most of the material presented at the meeting by SPC was proprietary.

Attachments: As stated cc: Mr. H. Donald Curet, Manager Product Licensing Siemens Power Corporation 2101 Horn Rapid Road P.O. Box 130 Richland, Washington 99352 0130 I

List of Attendees Name Organization Phone Number -

C. Doutt USNRC 301-415 2847 ,

- E, Wang - USNRC - 301 415 1076 D. Curet - SPC- - 509 375 8563 B. Nutt SPC 509 375 8325-S. V. Athavale (partial)- USNRC' 301 415 2976-

- M. Shualbi (partial) USNRC 301 415 2850

- L. Kopp (partial) - USNRC 301 415 2879 A. Attard (partial)' USNRC 1

e Attachment 1

SIEMENS S

Siemens Power Corporation's 7 Statistical Setpoint 4l and Transient Methodology b

H. D. Curet W--

Dr. W. T. Nutt k i Attachment 2

[ ] mv

SIEMENS Setpoint Methodology Agenda

. Purpose of the meeting - Don Curet

. Review of methodology - Bill Nutt

. Summary - Don Curet

SIEMENS Setpoint Methodology

. Purpose of meeting Inform the NRC of:

. SPC efforts to automate the setpoint methodology

. Consolidation of setpoint methodologies

!mplementation of alternative solution methods

. Unique methodology solution techniques Determine if changes to implement methodology automation remain consistent with the previously approved topicals r , ,

SIEMENS Implementation Outline General Description of Approved Methodologies

. Fuel Centerline Melt Calculations

. -Setpoints for a Combustion Engineering Plant

. Setpoints for a Westinghouse Plant

. Core Safety Limit Lines

. Transient Analysis - MDNBR Transient Analysis - FCM r i .

. =y

]>

t SIEMENS l SPC's Methodologies

[

C-E Plant Methodology 4

ENC Setpoint Methodology for C.E. Reactors: Statistical Setpoint I

Methodology, EMF-507(P)(A) and Supplements 1 and 2, September 16, 1986.

- Westinghouse Plant Methodology i

- Statistical Setpoint/ Transient Methodology for Westinghouse Type Reactors, EMF 92-081 (P)(A) and Supplement 1, February 1994 i

- Submittals cover current implementation at SPC

~

l Descriptions are diffuse and often not in great detail t j

i r i .

. _ __ ~ ,7

SIEMENS Implementation Basis Fuel Centerline Melt Calculations . . . . . . . . . . . Westinghouse Plant Methodology Combustion En jineering Setpoints . . . . . . . . . . . . . . . . . . C-E Plant Methodology Westinghouse Setpoints . . . . . . . . . . . Westinghouse and C-E Plant Methodolog;es Core Safety Limit Lines . . . . . Westinghouse and C-E Plant Methodologies (Implied) a l .

Transient Analysis - MDNBR . . . . . . . . . . . Westinghouse Plant Methodology and  !

DNB LCO Confirmation in C-E Plant Methodology  !

Transient Analysis - FCM . . . . . . . . . . . . . . . . Westinghouse Plant Methodology 4

l 6 i 1 e *** '

SIEMENS Implementation Goals

. Develop a complete, formal scheme conforming to af proved methodologies

. Make treatment of Westinghouse and C-E plants more similar

. Allows analysts to use experience with one plant type on the other Make process as automated as possible

. Eliminate data manipulation errors

. Eliminate oversights

. Increase uniformity of results i r i ,

N_. .

SIEMENS Implementation Summary SPC confirms existing or proposed setpoints 'on a cycle-specific basis

- Confirmations protect fuel centerline m elt (FCM), DNB and hot-leg saturation Core Safety Limit Lines (t ;LLs) are confirmed when plant conditions change

[- ]

[- ]

[- ]

[- ]

. Margin from DNB calculated statistically for transients Margin from FCM calculated statistically for transients t , . n ,,

L. .. .

SIEMENS Comparison to Sample Cases j -

DNB confirmations

-[ ]

[ ]

[ ]

[ ]

.[ ]

- [ .

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.[ j l -

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-[ ]

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t SIEMENS

, 1 Confirmation for Westinghouse Plants i

- Confirmation for Westinghouse Plants Not described in scmple cases .

-[ ]

. Statistical transients I!

.[ .

] .!

t

.[  ;

1  !

n l

'I ] t

- Core safety limit lines i

. Not discussed in sample cases

-[ ]

I j m er i

.SIEMENS LSSS and LCO Setpoints

. The basis of the trips for both plant types is the slow transient

. A slow transient is any transient which takes a long time to reach the trip setting compared to the loop transit time and the RTD response time

. For each reactor type, there is a trip to protect against fuel centerline melt (FCM) and one to protect against DNB and hot-leg saturation

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mi.9-..... _ , , .

SIEMENS Fuel Centerline Melt

. For UO 2 fuel, [ ] kW/ft is conservative

. The UO 2 limit is reduced [

]

[ ] is caiculated

. First cycle of operation

[ ]

. RODEX2 used for calculation

[ ]

- [ ]

. Process is deterministic 1

SIEMENS Flow of FCM Calculations t

Data Base [

]

Data Base Processing Code RODEX2 Calculations

[ [ [ [ [  ;

} }

1 1 1 Combine [ ] curves from RODEX2 with l 1 to get FCM LHGR Fuel Centerline Melt 1

l

[ } is *nst

_ - .re

SIEMENS Confirmation of DNB orotection

. Uses a large collection of cycle-specific axial power shapes  ;

- MDNBR calculations by XCOBRA-IllC Coriverts axial power shapes to inputs for XCOBRA-IllC

-[ ] -

. Calculates MDNBR at [ ]

-f ]

Calculates [ ] for [ -

] 1 Calculates [ ] for [ ]

. Finds [ ] l l Calculates [ ~

]

' l Fits [ ]

. Calculates probability distribution [ ]

. Combines uncertainties [ ] to confirm margin i ,.

t t i

! SIEMENS r ,

Combustion Engineering Plants f i

i i

. LSSS ' Protection

. LPD LSSS - Fuel Centerline Melt (FCM)

. TM/LP - DNB and hot-leg saturation 4

LCO Protection t

L

. LPD LCO - LOCA limit on LHGR

. DNB LCO - Transient DNB for Control Element Assembly

! Drop (CEAD) and Loss of Coolant Flow (LOCF) i j

i

[ ] included j j . Bounding allowance for [ l included

! l g- j is me

SIEMENS Typical Barn for C-E Plant 238 . ... . ... . .. .

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I SIEMENS I TM/LP Trip Trip variable is pressurizer pressure

. P = oc x Qong + 3xT CAL Y7

. Qong a QR, x QA i

.T CAL inlet Y c XB .

TM/LP has minimum pressure (Prioor;l

. Power maximum i

. Excore (neutron) detectors ,

. Calorimetric (thermal) calculation i

Ih

[  ; 17 s 2**r )

~SIEMENS Flow of LPD LSSS Confirmation Data Base [ Axial Power shape

files i i Data Base Processing Code Calculate FCM Limit on LHGR - OPTIONAL Confirm the LPD LSSS using [

]

Trip Margine g j w sa $r 1rfT*e 97001

SIEMENS Flow of TM/LP Confirmation Data Base Base XCOBRA-IIIC 4xia! Power Shape input Deck Files i I Data Base Processing Code i

Convert Axial Power Shapes to XCOBRA-!!iC input shapes I

Scan Axial Power Shapes to get the [ J Axial Power Shapes i

Get [ ]- power to get DNBR = [

_ 1 I

Get I ] - pressure to get DNBR = [

_ 1 I

[ I l

Calculate points for [ ] with XCOBRA-II!C I

Calculate margen between the TM/LP trip and DNB points ! j l

l Trin Margins l I I a * " '

SIEMENS Flow of DNB LCO Confirmation Data Base Base XCOBRA-lilC Axial Power Shape input Deck Files 1 I ijata Base Processing Code 1

i Convert Axial Power Shapes into XCOBRA-IllC input shapes i

Scan Axial Power Shapes l 1

Get i J Cases and i JCases 1

[ ]-[ . J difference between powers for [ ]

and [ ] Cases 1

Calculate 1 J with XCOBRA-IllC 1

Calculate margin between the DNB LCO and the DNB points [ J l

LCO Margins

. SIEMENS l Westinghouse Plants

! . OPAT

. Protects against FCM for slow transients.  !

t Based on measured AT and Al AT = A To [K4 -

Ks(T,.c -

Tm.c.o) - F( AI)]

1

[ T,y, = average of hot and cold leg RTD readings l

L F(AI) = reset function r  :

l

. Not all Westinghouse plants have a reset function i

.OTAT i

ji Protects against DNB and Hot Leg saturation

. Based on measured AT, P and AI L 4

AT = A To [K1 - K2 (T,.c -

T c.o) + K3 (P - Po) - F( AI)]

i i 1 n ==*r

! , .. , . _ _. . . _ . . . _ _ _ _ _ . - . ._ . . . , .. _ _ _ . . _ , - _ . . . _ . , _ _ . - . . _ . _ . .__ .._. .._.__t

SIEMENS Flow of OTAT Confirmation Data Base Base XCOBRA-IllC Axial Power Input Deck Shape Files i I Data Base Processing Code I

Convert Axial Power Shapes to XCOBRA-IllC input shapes I

Scan Axial Power Shapes to get the i j Axial Power Shapes I

l 1 1

l i I

i 1 1

Calculate i 1 with XCOBRA-IliC 1

Calculate margin between OTAT trip and DN8 points f j i

l Trip Margins l

} 22 , 3,,

SIEMENS s

Flow of OPAT Confirmation '

Data Base [ Axial Power >

] shape files Data Base Processing Code Calculate FCM Umit on LHGR I

- OPTIONAL  :

L t

, Confirm OPAT [  !

]  !

i L

Trip Margins j i

i i

f f 23 SWTI -

SIEMENS Core Safety Limit Lines

. Appear in plant technical specifications

. A series of. isobars on power and temperature plot

. Lines of demarcation for regions in which DNB or hot-leg saturation occur

. Not generally useful in operating the plant

. Confirmation of CSLLs does not support operation at reduced power i i -

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SIEMENS '

Transient Analysis s

- Confirmation of trip setpoint based on-[ ]

[ ]

l 1

-[ ]

- Implementation treats [ ] deterministically Conservative treatment of [ ]

Consistent with approved methodology Subset of parameters treated [ ]

[ 1

- [ ] .

[ ]

-[ 1 I 1 " " " '

SIEMENS DNB Margin Confirmation Response surface points obtained using XCOBRA-IllC l

Variation in MDNBR with [ ]

[  : to points used to get [

]

[ ] combined to get [

] for MDNBR e

] for DNB margin calculated

.[ J calculated

.: ] calculated i I 2r ' ' " '

e m

l k

c e l o

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Cl ]

l I

A R

B s O C

n X i

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. SIEMENS FCM Margin Confirmation

. Calculate margin between [ ]for event Use [ ] power shapes

[ ]

- [ ]

. Margin to FCM

- t 1

[ ]

-[ 1

- Defined by [

} .

Calculated for [ -]

t , , ,n,,

.m . . _

SIEMENS -

Summary of Current implementation

. Confirms margin for existing setpoints for Westinghouse and C-E plants Treats [ ]

Uses special-purpose computer codes to replace

]

Coriverts [ ,

J

. Treats trip settings-[

] confirms [ ] power margin with a : -]

Confirms CSLLs [ ]

, - x- e . . . <

~

SIEMENS-4 Setpoint Methodology

. Summary NRC informed of:

. SPC efforts to automate the setpoint methodology

. Consolidation of setpoint methodologies

. Implementation of alternative solution methods

. Unique methodology solution techniques Changes to implement methodology automation.and alternative solutions methods are consistent with the previously approved topicals l

I } 3' 2m

- - - - _