ML20006F456
| 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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HL-952 000185 February 20, 1990
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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 Power ' Company'.s (GPC) response.
The enclosure contains -the requested
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- information..
A 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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. February.20,.1990 1
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Mr. H.- C. Nix, General Manager - Nuclear Plant Mr. J. D, Heidt,. Manager Engineering and Licensing - Hatch GO-NORMS 9
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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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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