ML20010F843

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Provides Info as Suppl to Util 810122 Ltr Re Implementation of NUREG-0619,per NRC 810715 Ltr.Info Addresses Feedwater Low Flow Controllers & Control Rod Drive Sys
ML20010F843
Person / Time
Site: Hatch  Southern Nuclear icon.png
Issue date: 09/01/1981
From: Widner W
GEORGIA POWER CO.
To:
Office of Nuclear Reactor Regulation
References
RTR-NUREG-0619, RTR-NUREG-619 TAC-46706, TAC-46707, NUDOCS 8109110438
Download: ML20010F843 (2)


Text

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Georgia '

Power September 1, 1981 W. A. Widner

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- :n Director of Nuclear Reactor Regulation D U. S. Nuclear Regulatory Commission c'/

Washington, D. C. 20555 .,

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EDWIN I. HATCH NUCLEAR PLANT UNITS 1, 2 /. / ,.('

NUREG-0619 IMPLEMENTATION - SUPPLEMENTAL INFORMATsIh,j . p' ,,e k

Gentlemen:

Pursuant to your letter dated July 15, 1981, Georgia Power Company hereby submits the following information as a supplement to our January 22, 1981 letter regardine implementation of NUREG-0619, "BWR Feedwacer Nozzle and Control Rod Drive Return Line Nozzle Cracking":

Feedwater It has been determined that the existing feedwater low flow centrollers for Haten 1 and 2 do not meet the six characteristics spacified in section 1.4.4.3 of General Electric (GE) report NEDE-21821-1.. Although these present low flow controllers do not meet the characceristics as described in the GE Report as required by the NRC, .tey can be considered acceptable provided a plant-specific frac ure mechanics analysis as described in NRC Generic Letter 81-11 is pr formed.

Analysis of the Hatch 1 and 2 Feedwater nozzles will be rmed by June 30, 1983 and the results reported to NR" in i~ .ic e with NUREG-0619 requirements.

Control Rod Drive As noted in our January 22, 1981 response, the CRD return line on both units is capped at the RPV nozzle and the return line rerouted to RWCU.

The return line is valved open thus maintaining continuous return flow to the RPV through RWCU. Therefore, the installation of pressure equalizing valves is not required.

The pressure control station required by section 8.1-(5) of the NUREG is installed on both units.

A system performance test was performed on Hatch 1 after capping and rerouting the CRD return line during the 1977 refueling outage. Post modification CRD system operability was adequately demonstrated.

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Geogia Power d Director of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Page Two September 1, 1981 The CRD return line was capped and rerouted on Hatch 2 during plant construction. System operability and performance has been demonstrated during pre-op testing of the CRD system.

General Electric letter MFN-285-79, dated November 27, 1979, addressed minimum makeup flow required of the CRD system. There have not been any site terts conducted on either Hatch unit which would demonstrate the CRD systera's ability to perform this makeup flow injection. Additional testing to demonstrate makeup flow capability of 135 gpm (minimum makeup flow to keep core covered) will be required to meet NUREG-0619 requirements. Georgia Power commits to performing the necessary flow-tests during the next refueling outages currently scheduled for January 1982 for Hatch 2 and May 1982 for Hatch 1. Upon completion of these tests, Hatch 1 and 2 will be in full compliance with the CRD system-related portion of NUREG-0619.

If you have any questions in this regard, please contact my office.

W. A. Widner states that he is Vice President of Georgia Power Company and is authorized to execute this oath on behalf of Georgia Power Company, and that to the best of his knowledge and belief the facts set forth in this letter are true.

GEORGIA POWER COMPANY By: MM W. A. Widner Sworn t and subscribed before me this 1st day of September, 1981.

Notary Public, Georgia, State at Large

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JAE/mb xc: M. Manry R. F. Rogers, III