ML20006F456

Responds to Request for Addl Info Re Generic Ltr 88-11, NRC Position on Radiation Embrittlement of Reactor Vessel Matl & Impact on Plant Operations. RTNDT Value for Unit 2 Closure Flange Region Addressed

ML20006F456
Person / Time
Site:	Hatch
Issue date:	02/20/1990
From:	Hairston W GEORGIA POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
GL-88-11, HL-952, NUDOCS 9002280050
Download: ML20006F456 (3)

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, ,l U.S. Nuclear Regulatory Commission ATTN: Document Control D3sk i Washington, D.C. 20555 PLANT HATCH - UNITS 1, 2 NRC DOCKETS 50-321, 50-366 OPERATING LICENSES DPR-57, NPF-5 REQUEST FOR ADDITIONAL INFORMATION:

PRESSURE-TEMPERATURE LIMITS PERTAINING TO GENERIC LETTER 88-11 Gentlemen:

. . On November 22, 1988, Guargia Power Company (GPC) provided its response

'to Generic Letter 88-11 "NRC Position on Radiation Embrittlement of.. Reactor Vessel Material and its' Impact on Plant Operations" for Plant Hatch. The Materials- and Chemical Engineering Branch of Nuclear Reactor Regulation (NRR) -requested additional information to complete their review of Georgia

.c Power ' Company'.s (GPC) response. The enclosure contains -the requested A -

information..

Please contact this office if you have questions.

Sincerely,

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Enclosure:

Request for Additional Information:

Pressure-Temperature Limits Pertaining L, to Generic Letter 88-11 c: (See next page.)

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Mr. H.- C. Nix, General Manager - Nuclear Plant Mr. J. D, Heidt,. Manager Engineering and Licensing - Hatch 9

GO-NORMS U.S. Nuclear Reaulatory Commission. Washinaton. D.C.

Mr. L. P. Crocker, Licensing Project Manager - Hatch  ;

U.S. Nuclear Reaulatory Commission. Reaion II Mr. S. D.- Ebneter, Regional Administrator '

Mr. J. E. Menning, Senior Resident Inspector - Hatch x

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, J ENCLOSURE  ;

PLANT HATCH - UNITS 1, 2 NRC DOCKETS 50-321, 50-366 OPERATING LICENSES DPR-57, NPF-5  ;

REQUEST TOR ADDITIONAL INFORMATION:  ;

PRESSURE-TEMPERATURE LIMITS J PERTAINING TO GENERIC LETTER 88-11 i- _

The - following information is provided in response to a verbal request from -

the- Materials and Chemical Engineering Branch of NRR. The information pertains to GPC's response to Generic letter (GL) 88-11 for Plant Hatch.

1. Provide the RTNDT value for the Hatch 2 closure flange region.

RESPONSE: The closure flange region RTNDT for Hr.tch 2 is currently assumed to ba 400F, based on the vessel purchase specification requirement that all vessel materials meet ASME Code (at date of -

construction) requirements for toughness at 400F or less. The actual RTNDT for the closure flange region has been determined as ,

part of the surveillance capsule test work currently in progress at GE. Based on Charpy data taken at the time of fabrication, and using a GE correlation to estimate the RTNDT, as it would be measured by current ASME requirements, the closure flange region has a RTNDT of 300F,

2. Is 78 ft-lb upper shelf energy (USE) given in the FSAR for Hatch I beltline plates a typical value, or the lowest value?

RESPONSE: The USE value of 78 ft-lb is the lowest value for.the Hatch I beltline plates. This value is the equivalent transverse

.USE, estimated from longitudinal USE data by the methods of Branch Technical Position MTEB 5-2. This is also expected to be the lowest USE of any beltline material in Hatch 1, although data ,

appropriate for determining USE are not available for the beltline welds.-

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