ML20236C733

Summary of 890307 Meeting W/Util in Rockville,Md Re Proposed Mods to Fletch Correlation for Use in LOCA Analysis. Attendance List Encl

ML20236C733
Person / Time
Site:	Yankee Rowe
Issue date:	03/14/1989
From:	Fairtile M Office of Nuclear Reactor Regulation
To:	Office of Nuclear Reactor Regulation
References
TAC-66993, NUDOCS 8903220293
Download: ML20236C733 (4)

Text

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onneog jo,, UNITED STATES 8( o NUCLEAR REGULATORY COMMISSION h WASHINGTON, D. C. 20665 March 14,1989 Docket No.50-029 LICENSEE: Yankee Atomic Electric Company FACILITY: Yankee Nuclear Power Station at Rowe

SUBJECT:

MEETING

SUMMARY

-(TAC N0.66993) g this meeting was held on March 7,1989 in Rc.:kvilla, Maryland to discuss the NRC concerns with the licensee's submittal of January 5,1988 regarding their proposed modification to the Flecht correlation, for use in the Yankee Rowe LOCA analyses.

E The licensee provided the information in the January 5th submittal, per his statement, to improve the LOCA reflood models and to attain an approximate 3%

increase in margin in his linear heat generation rate. The results would be, if the NRC ap.oroves the requested changes, used to provide more flexibility in core oparations.

In its currently approved LOCA model, the licensee used data available for 15x15 fuel bundles; however Yankee Rowe uses 17x17 fuel. The licensee appiled a 0.8 multiplier to the 15x15 data to make it applicable to their 5 17x17 fuel. The proposed modification is based on 17x17 data and will elivinate the need to apply a 0.8 multiplier. In addition a new steam cooling model was proposed.

The NRC has previously approved the licensee's new steam cooling model, for use in the LOCA analyses. However, in our current review of th.? Flecht correlation, the staff will prepare a new unified SER that will readdress steam cooling.

The staff expressed a concern th6t the data ranges in the submittal were very narrow and as a consequence gaestioned whether the correlation held for all values of the reflood rate, clad temperature and power. We also asked the licensee to demonstrate that the correlation has the_same trends as the data.

The data set represents only five points. We sucgested that more benchmarking may be required to verify the model; the licensee agreed to provide this additional benchmarking.

A second concern of the staff was that hydraulic diameter and rod size in the data are different from those actually used in the Yankee Rowe core and that the applicability of the available data must be demonstrated. The licensee agreed to provide this tiemcastration.

Lastly, we were concerned about height correlation of the data as the Rowe core is only 7.6-feet in height while the data is from 12-foot rods. The licensee stated that their model accounts for this effect and was considered in their new correlation.

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n' In summary, the licensee was requested to provide more benchmarking and what would be done if outside the band of data, and to provide the effects of hydraulic diameter. and rod size. Yankee Atomic promised a response to the-staff concerns by early~ May 1989 and would'need our SER by the end of June 1989L "

to accommodate the next core design.

A list of attendees is enclosed.

Original signed by: ,

Morton B. Fairtile, Project Manager Project Directorate I-3 ,

Division of Reactor Projects I/II Enclcsure:

As. stated cc w/ encl.:

See ner.t page DISTRIBUTION:xSee@WWile, NRC& Local PDRs, PDI-3 r/f, MFairtile, OGC, EJordan,

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OFFICIAL CORD COPY 1

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Mr. George Papattic, Jr.

Yankee Atomic Electric Company Yankee Nuclear Power Station.

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1 Dr. Andrew C. Kadak, President and Chief Operating Officer. Mr. George Papanic, Jr. l Yankee Atomic Electric Company Senior Project Engineer-Licensing 580 Main Street Yankee Atomir. Electric Company Bolton, Massachusetts 01740-1398 580 Main Street Bolton, Massachusetts 01740-1398 Thomas Dignan, Esquire P. opes and Gray .Mr. George Sterzinger 225 Franklin Street Commissioner Ooston, Massachusetts 0?l10 Vermont Department of Public Service Mr. N. N. St. Laurent 120 State Street, 3rd Floor Plant Superintendent Montpelier, Vermont 05602 Yankee Atomic Electric Company Star Route Rowe, Massachusetts 01367 Chairman Board of Selactmen Town of Rowe Rowe, Massachusetts 01367 Resident Inspector Yankee Nuclear Power Station c/o U.S. f;RC Post Office Box 28 Monroe Bridge, Massachusetts 01350 Regional Administrator, Region I U.S. Nuclear Regulatory Commission 475 Allendale Road King of Prussia, Pennsylvania 19406 Robert M. Hallisey, Director Radiation Control Program Massachusetts Department of Public Health 150 Tremont Street, 7th Floor Boston, Massachusetts 02111

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- ENCLOSURE' March'7, 1989-Yankee Rows Flecht Correlation Meett~ng 1

List of Attendees 1

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Name Organization j M. Fairtile NRR/PDI-3 G. Papanic, Jr. Yankee Rowe R. T. Jensen SRIC-Idaho. Falls R. C. Jones NRC/SRXB R. C. Harvey Yankee Rowe i

R. K. Sundaram Yankee Rowe i

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