ML20043G014
| ML20043G014 | |
| Person / Time | |
|---|---|
| Site: | Maine Yankee |
| Issue date: | 06/11/1990 |
| From: | Leeds E Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 9006180421 | |
| Download: ML20043G014 (19) | |
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June 11, 1990
-Docket No. 50-309 I
LICENSEE:
Maine Yankee Atomic Power Company FACILITY:
Maine Yankee Atomic Power Station l
SUBJECT:
MEET 1HG
SUMMARY
ON STAR CORE RELOAD CODE l
On June 5, 1990, the NRC staff met with representatives of Maine Yankee and
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Yankee Atomic Electric Company to discuss the Space and Time Analysis of l
Reactors (STAR) core reload code. The need for the new code is due to the.
-l eroding of the main steam line break (MSLB) shutdown margin based on the i
presently applied codes. The-licensee presented an outline of the STAR code as-well as a potential schedule for submittal to the NRC so that staff review could be complete in time to apply the code for the Cycle 13 reload (November j
1991).
The staff indicated that the licensee's schedule was realistic and that staff review could be completed in time to apply the STAR code for the Cycle 13 reload provided adequate funding was available for the review. Confirmation of funding for the. review will not be available until the budget for FY 1991 is approved.
l 1
A copy of the licensee's briefing material and a list of meeting attendees is enclosed.
i
/5 Eric J. Leeds, Project Manager Project Directorate 1-3 Division of Reactor Projects 1/11
Enclosures:
As stated cc: See next page DISTRIBUTION:
Docket 211e2502309' J. Johnson NRC & Local PDRs E.McCabe F.Miralia R.Freudenberger PDI-3 Reading L.Phillips
-R.Wessman R. Jones E. Leeds H.Richings OGC D.Fieno E. Jordan ACRS(10)
J. Dyer TP(1
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SUMMARY
OF 6/5/90 l
9006180421 900611 1
PDR ADOCK 05000309 l
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' Mr. C. D.: Frizzle cc:
Mr. Charles B. Brinkman Mr. G. D. Whittier, Manager Manager - Washington Nuclear:
Nuclear Engineering and Licensing Operations Maine Yankee Atomic Power Company Combustion Engineering, Inc.
- 83 Edison Drive
-12300 Twinbrook Parkway, Suite 330 Augusta, Maine 04336
- Rockville, Maryland ?0852 T
Mr. Robert W. Blackmore, John A. Ritsher, Esquire Plant Manager Ropes & Gray Maine Yankee Atomic Power Company 225 Franklin Street P.O. Box 408-Boston, Massachusetts 02110 Wiscasset, Maine 04578 State Planning Officer Executive Department 189 State Street Augusta, Maine 04330 Dr. E. T. Boulette, Vice President Operations
~ Maine Yankee Atomic Power Company P. O. Box 408 Wiscasset, Maine 04578 Nr. J. H. Garrity, Vice President Licensing and Engineering Maine Yankee Atomic Power Company 83 Edison Drive
-Augusta, Maine 04336 Regional Administrator, Region 1 U.S. Puclear Regulatory Comission 475 Allendale Road King of Prussia, Pennsylvania 19406 FirstSElectmanofWiscasset Municipal Building U.S. Route 1 Wiscasset, Maine 04578 Mr.~Cornelius F. Holden Resident Inspector Maine Yankee Atomic Power Station U.S. Nuclear Regulatory Comission
- P. O. Box E -
Wiscasset, Maine 04578 Mr. P. L. Anderson, Project Manager Yankee Atomic Electric Company 580 Main Street Bolton, Massachusetts 01740-1398
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l METHODOLOGY t
APPLICATION
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CONTENTS Introduction Need l
Schedule STAR L
History 4
Neutronics i
Cross. Sections Hydraulics n
l Benchmarks L
Applications h
ll Rod Ejection Main Steam Line Break t
. Report Contents Summary 1
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Space and Time Analysis of Reactors (STAR)
QUANDRY VIPRE STAR Methodology for PWR's Applied to i
Main Steam Line Break Control Rod Ejection
. Seeking Generic PWR Approval Methods Applied Very Similar to Those Already Approved by the NRC i
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NEED FOR STAR MSLB Shutdown Margin has Been Degrading l
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I Shutdown Margin % Ap Cycle 1,43 10 1
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.41 12-0 or Less Projected For 13 a
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SCHEDULE l
- Completion of STAR Report 10/31/90.
-1 Submittal to NRC 10/31/90 Approval From NRC Required 10/31/91
'r Cycle 13 Startup 11/30/91 I
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STAR CODE HISTORY Developed Jointly by NUS and YAEC From Early 1980's Through May 1987 Development Continued.Since May 1987 by YAEC z
Thermal-Hydraulic Methods Added SIMULATE-3 Cross Section Processing
& Editing Changes Made e
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i STAR Uses Analytic Nodal Method of
.QUANDRY Adds Assembly Discontinuity Factors Alters Solution Method to Use Non-Linear Iteration Retains (As in Original QUANDRY)
Wielandt Fractional Iteration Method For Fission Source Iteration H
Cyclic Chebyshev Semi-Iterative Method for Flux Iteration u
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STAR CODE CROSS SECTIONS 1
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STAR Can Use Cross Sections &
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Assembly Discontinuity Factors o
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Entered-Directly by Composition 2.
Evaluated From SIMULATE-YA or SIMULATE-3 Cross Section Libraries t
a YAEC Production applications will use-SIMULATE-3 for Consistency.with Methods' Approved by NRC a
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.;v STARLCODE HYDRAULICS STAR Thermal-Hydraulic Options include:
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Coupled VIPER-01 Calculation n
L Used for Calculations Where Cross L
Flow is Significant (Steam Line Breaks) i Can be Used With No Gap i
Connections Between Bundles for Closed Channel Calculations 2.
Original QUANDRY Models-L WIGL3 Lumped Heat Capacity Model l,
Used for. Closed Channel Calculations ~(Rod Ejections)
LRA Feedback Model(For Benchmarks Only)
.e STAR CODE BENCHMARKS Classic Numeric Cases lAEA'2D & 3D PWR Benchmarks LRA 2D & 3D Quarter Core Transients n
LRA 2D Quarter Core Static " Rods In" l
l TWIGL Step & Ramp Perturbation
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Transients LMW 3D PWR Transient With & Without Feedback-u l'
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.n STAR CODE BENCHMARKS i,
i Yankee Rowe. Rod Drop 2/18/87 STAR was Used to Model Dropped Rod Event That Occurred Near End of Cycle 18 EPRI HERMITE Comparison EPRI Commissioned-CE to Duplicate HZP Rod Ejection From Westinghouse PWR Using Their Licensed Method HERMITE This Calculation was Repeated With STAR a
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CONTROL ROD EJECTION L
APPLICATION l
Method Same as in YAEC 1464 I'
Point Kinetics With Doppler Weighting D
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Only Difference STAR Replaces HERMITE l
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MAIN STEAM LINE BREAK l
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Approach Will Use RETRAN Point Kinetics to Predict Power Response-1 STAR / SIMULATE Will be Used to Account For Spatial Effects on Moderator Feedback Weighting Factors For Use in RETRAN Will Be Generated By Comparison with STAR DNB Correlation for Low Flow Will Be Proposed No Mixing Credit Acceptance Criteria As in SRP
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OUTLINE OF REPORTCONTENTS x
STAR Code Description History L
' Theory.
Benchmarks Classic Numeric Cases Yankee Rowe Rod Drop 2/18/87
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EPRI HERMITE Comparison Main Steam Line Break Application Current Licensing Method STAR Application for MSLB Demonstration Analysis (Seabrook MSLB)
Control Rod Ejection Application Current Licensing Method STAR Application For Rod Ejection Demonstration Analysis (Maine Yankee Rod Ejection) l y
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SUMMARY
Maine Yankee Needs STAR for Cycle 13
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- Yankee Topical Submittal Oct. 31,1990 i
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-NRC Approval Requested Oct. 31,1991-I e
STAR Uses Codes Familiar to NRC c
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Applied to Rod Ejection & MSLB L
L Methods Application Similar to Those i
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