ML20154P260

Summary of 880907 Meeting W/Util Re Thermal Stratification in Pressurizer Surge Line.Attendance List & Collection of Slides Used in Presentation Encl

ML20154P260
Person / Time
Site:	Beaver Valley
Issue date:	09/20/1988
From:	Tam P Office of Nuclear Reactor Regulation
To:	Office of Nuclear Reactor Regulation
References
TAC-69219, NUDOCS 8809300176
Download: ML20154P260 (19)

Text

SEP 2 0 1988 Docket No. 50 112 PLANT: Beaver Valley Unit 2 LICENSEE: Duquesne Light Company

SUBJECT:

MEETING

SUMMARY

- THERMAL STRATIFICATION IN THE PRESSURIZER SURGE LINE (TAC 69219)

A meeting was originally called to address the subject issue at Comanche Peak. Mcwever, the scope of that meeting was expanded to include Peaver Valley Unit 2 (see meeting notice, P. Tam to J. Stolz dated Septembe? 1, 1988). This suntnary therefore only covers the part of the meeting when Duquesne Light Company (DLC) personnel made the presentation and held discussion with the steff. is the treeting attendee list showing only DLC and NRC personnel. is the collection of slides used by DLC in the presentation; this enclosure is self-explanatnry and serves as a record of what was said by licensee personnel.

The staff asked questions to clarify various points, and indicated that the licensee appears to be on the right track to address the subject issue. No additional licensee actions were requested by the staff in the meeting but there niay be future requests, original signed by Peter S. Tam, Senior Project Manager Project Directorate I-4 Divisien of Reactor Projects I/II

Enclosures:

As stated cc w/ enclosures See next page L(:" 'y PM:PDI-t D:PDI-4 JStolz

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Docket No. 50-412 PLANT: Beaver Valley Unit 2 LICENSEE: Duquesne Light Company

SUBJECT:

MEETING

SUMMARY

- THERMAL STRATIFICATION IN THE PRESSURIZER SURGELINE(TAC 69219)

A meeting was originally called to address the subject issue at Comanche Peak. However, the scope of that meeting was expanded to include Beaver Valley L' nit 2 (see meeting notice, P. Tam to J. Stolz dated September 1, i

1988). This sumary therefore only covers the part of the meeting when Duquesne Light Company (DLC) personnel made the presentation and held discussion with the staff. is the meeting attendee list showing only DLC and NRC personnel. is the collection of slides used by DLC in the presentation; this enclosure is self-explanatory and serves a: a record of what was said by licensee personnel. The staff asked questions to clarify various points, and indicated that the licensee appears to be on the right track to address the subject issue. No additional licensee actions were requested by the staff in the meeting but there may be future requests.

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Peter S. Tam, Senior Project Manager Project Directorate I-4 Division of Reactor Projects I/II Enclos.ures:

As stcted cc w/ enclosures See next page l

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Fr. J. Sieber Duquesne Light Conipany Beaver Valley Power Station Units 1 8 ?

CC:

Bureau of Radiation Protectior-Jay E. Silberg, Esquire Pennsylvania Department of Environtrental Shaw, Pittman, Potts and Trowbridge Rescurces 7300 N Street, N.W.

AT7N:

R. Janati Washington, DC 70037 Post Office Box 2063 Harrisburg, Pennsylvania 17120 Kenny Grada, Manager Mayor of the Borrough of Nuclear Safety Shippingport Duquesne Light Company Post Office Box 3 P. O. Boy 4 Shippingport, Pennsylvania 15077 Shippingport, Pennsylvania 15077 William Lacey, Manager Ashley C. Schannauer Nuclear Operations Department Assistant City Solicitor Post Office Box 4 City of Pittsburgh Duquesne Light Company 313 City-County Building Shippingport, Pennsylvania 15077 Pittsburgh, Pennsylvania 15219 John A. Lee, Esquire Regional Administrator, Region I Duquesne Light Cortpany U.S. Nuclear Regulatory Comission One Oxford Centre 475 Allendale Road 301 Grant Street King of Prussia, Pennsylvania 19406 Pittsburgh, Pennsylvania 15279 W.F. Carmichael, Comissioner Resident Inspector 1

Cepartment of Labor U.S. Nuclear Regulatory Comissien 1800 Vashington Street East Post Office Box 181 Charlesten West Virginia 25305 Shippingport, Pennsylvania 15077 John D. Borrows Director, Pennsylvania Emergency Director, Utilities Departrrent Panagerent Agency Public Utilities Comission Post Office Box 3321 1EJ East Broad Street Harrisburg, Pennsylvania 17105-3321 Columbus, Ohio 43266-0573

G e.Iosure{

MEETING WITH DUQUESNE LIGHT COMPANY SEPTEMBER 7, 1988 ATTENDEES Name A_f fi_11ation T.II.Nilson CPPD/OSP/NRC P.F.McKee CPPD/OSP/NRC J.S.Wiebe CPPD/OSP/NRC P.T.Kuo NRC/NRR/EMEB George Dick NRC/NRR/PD-4 Peter Tam NRC/NRR/PDI-4 S.K.Mu khe rjee Duquesne Light Co.

Steve Greer Stone and Webster Michael Testa Duquesne Light Greg Kamerdeiner Duquesne Light Nelson Tonet Duquesne Light James E. Lyons NRC/OSP/CPPD C.Y.Cheng NRC/ DEST /EMTB L.B. Marsh NRC/ DEST /EMEB S.Hou NRC/ DEST /EMEB S. Lee NRC/ DEST /EMTB G.DeGrassi NRC/BNL T.Chan NRC/PDS

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DUQUESNE LIGHT COMPANY BEAVER VALLEY UNIT 2 PRESSURIZER SURGE LINE STRATIFICATION S. K. MUKHERJEE NUCLEAR ENGINEERING DEPARTMENT

i BACKGROUND e

ORIGINAL CONFIGURATION OF SURGE LINE (PRE RFT)

TANDEM 6 KIP MECH. SNUBBERS INSTALLED WHIP RESTRAINTS REMOVED PER IPJET PROGRAM t

S<.e. % verth(ley Uni x

56R Sqf eme t 4, l

n 2 VARIABLE SPRING HANGERS INSTALLED } section 3 1 PERMANENT RTD INSTALLED 0

OPERATING LIMITS - MAX TEMP. DIFF. 300 F BGCAME l

e STRATIFICATION FIRST 6 APPARENT DURING Qoi _Lctica l Test )

HFT 1

- UNUSUAL MOVEMENT OF SNUBBERS NOTED

- ADDITIONAL INSTRUMENTATION INSTALLED TO REMOTELY MONITOR DISPLACEMENT DURING FUTURE TESTING e

DURING PREOP AND POWER ASCENSION TESTING FURTHER DISPLACEMENT OF A CYCLIC NATURE WERE OBSERVED

- MAX. RECORDED DISPLACEMENT MAS ~ 3.O INCRES VERSUS.4 IN. CALCULATED DISPLACEMENT

- MAX. DIS?LACEMENT OCCURRED DURING REAT UP AND COOL DONN i

t

- FROM EVALUATION OF DATA CONCLUDED THAT HIGH DISPLACEMENTS NERE A RESULT OF FLUID THERMAL STRATIFICATION DATA COLLECTION e

- PIPING DISPLACEMENTS APPEARED TO VARY AS A FUNCTION OF TEMkERATURE DIFFERENTIAL BETWEEN THE PRESSURIZER AND THE RCS HOT LEG e

- ADDITIONAL INSTRUMENTATION INSTALLED TO REMOTELY MONITOR TEMPERATURE e

- CONTINUED PLANT TESTING WITH CONTINUOUS MONITORING OF DISPLACEMENTS AND TEMPERATURE ACTIONS e

- IMPOSED HEAT UP/ COOL DOWN LIMITATION OF AT.6 200 F BETWEEN PRESSURIZER AND,RCS 0

HOT LEG e

- REMOVED SNUBBER TRAPEZE ON SURGE LINE UTILIZING gfaved fo r u.5c by thH l;

ASME CODE CASE N-411 N Ac. feifer 10 MC > Y#[8 7 e

- ANALYSIS CONDUCTED TO QUANTIFY EFFECTS OF STRATIFICATION

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4

.._,__._,.._m

SPECIFIC ANALYSIS e

- SIMPLIFIED 'ANSYS' MODEL OF SURGE LINE GENERATED

- MODEL COMPRISED OF ELASTIC BEAM ELEMENTS

- FIRST BENCE MARKED 'ANSYS' MODEL TO ORIGINAL

'NUPIPE' MODEL

- ALL THERMAL CONDITIONS APPLICABLE TO SURGE LINE NERE REVIEWED TO DETERMINE THE PRESENCE OF THERMAL STRATIFICATION AND POTENTIAL EFFECTS ON THE EXISTING PIPING ANALYSIS

- THESE THERMAL CONDITIONS INCLUDED e

NORMAL PONER OPERATION e

HEAT UP AND COOL DONN e

MAXIMUM STRATIFICATION FOLLOWING PLANT EXCURSION / TRIP

I

'ANSYS' MODEL INCORPORATED ACTUAL RECORDED e

IN-PLANT TEMPERATURE DATA DURING THE ABOVE THERMAL CONDITIONS TO QUANTIFY THERMAL STRATIFICATION EFFECTS e

- RESULTS OF 'ANSYS' MODEL (FORCES, MOMENTS) FOR EACH APPLICABLE THERMAL CONDITION MAS RE-EVALUATED BY THE ORIGINAL 'NUPIPE' MODEL e

- NUPIPE MODEL THEREFORE COMBINED THE EFFECTS OF THERMAL STRATIFICATION WITH ALL OTHER LOADING CONDITIONS 9

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WHIPJET REVIEW e

EFFECT OF REVISED ANALYSIS ON SURGE LINE EVALUATED LEAKAGE SIZE FLAW RECALCULATED STABILITY EVALUATION CONDUCTED FATIGUE CRACK GROWTH RATE ANALYSIS REVIEWED e

MAINTAINED MARGINS PER NUREG 1061 VOL. 3

BV-1 SURGE LINE REVIEN e

GEOMETRY CLOSELY APPROXIMATES BV-2 THIS INCLUDES PIPE ROUTING, SIZE, ENTRANCE INTO HOT LEG AND SLOPE e

SUPPORTING ARRANGEMENT SIMILAR TO BV-2 NO RUPTURE RESTRAINTS ON SURGE LINE PIPING SUPPORTED BY TWO VARIABLE SPRING HANGERS OPERATIONAL RESTRICTIONS IMPOSED DURING HEATUP/

e COOLDOWN SIMILAR TO BV-2 o

PIPING LOADE DUE TO STRATIFICATION FROM BV-2 ANALYSIS BEING EVALUATED l

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_m_______,~-._,_._-v_-___,______.__--m.,.

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CONCLUSIONS e

STRATIFICATION EFFECTS WERE QUALIFIED AND INCORPORATED INTO THE ANALYSIS e

ANALYSIS SHOMS THAT CODE ACCEPTABILITY MAINTAINED UNDER ALL CASES e

WHIPJET REANALYSIS OF SURGE LINE DEMONSTRATES PIPE LBB CAPABILITY UNDER REVISED LOADING luk- $

• fore-b realg e

OPERATIONAL RESTRICTIONS OF dT $ 200 F IMPOSED 0

DURING HEATUP AND COOLDOWN ON BOTH BV-1 AND BV-2 SIMILARITY OF BOTH UNITS SHOMS BV-2 STRATIFICATION e

EFFECTS / LOADS CAN BE APPLIED TO BV-1

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DISTRIBUTION i.

. M ew NRC & Local PDRs PDI-4 JStolz PTam OGC-Rockyllle EJordan B. Grimes NRC Participants J.H. Wilson P.F.McKee

'J.S.Wiebe P.T.Kuo George Dick James E.Lyons C Y.Cheng L.B.Ma rsh S.Hou S. Lee G.DeGrassi T.Chan ACRS(10) gfd

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