ELV-00615, Responds to NRC Bulletin 89-001, Failure of Westinghouse Steam Generator Tube Mechanical Plugs. Util Determined That No Tube Plugs Identified as Susceptible to Primary Water Stress Corrosion Cracking Installed in Steam Generators

Responds to NRC Bulletin 89-001, Failure of Westinghouse Steam Generator Tube Mechanical Plugs. Util Determined That No Tube Plugs Identified as Susceptible to Primary Water Stress Corrosion Cracking Installed in Steam Generators

ML20244E413
Person / Time
Site:	Vogtle
Issue date:	06/16/1989
From:	Hairston W GEORGIA POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
ELV-00615, ELV-615, IEB-89-001, IEB-89-1, NUDOCS 8906200329
Download: ML20244E413 (3)

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June 16, 1989 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D. C. 20555 PLANT V0GTLE - UNITS 1, 2 NRC DOCKETS 50-424, 50-425 OPERATING LICENSES NPF-68, NPF-81 NRC BULLETIN 89-01: FAILURE OF WESTINGHOUSE STEAM GENERATOR TUBE MECHANICAL PLUGS Gentlemen:

In the subject bulletin, the NRC requested that PWR licensees and construction permit holders determine whether certain mechanical plugs identified as susceptible to primary water stress corrosion cracking (PWSCC) are installed in their steam generators. If such plugs are installed, the NRC requested

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that an action plan be implemented to ensure that those plugs will continue to provide adequate assurance of reactor coolant system pressure boundary integrity under normal operating, transient, and postulated accident conditions.

Georgia Power Company (GPC) has determined that none of the tube plugs ,

identified as susceptible to PWSCC are installed in the Vogtle steam 1 generators. Actions 1, 2.d and 2.e are, therefore, the only actions requested in the bulletin which apply to Plant Vogtle. GPC's responses ~ to Actions 1, 2.d, and 2.e are provided in the following paragraphs.

Action Requested

1. " Addressees are requested to verify that information contained in References 1 and 2 relating specifically to their plants is correct for plugs supplied from heat numbers 3279, 3513, 3962, and 4523. The specific information to be verified is the number of Westinghouse mechanical plugs installed in the hot and cold legs broken down by steam generator number,

- heat number, and date of installation. If information from these references is incorrect, appropriate corrections should be identified.

Addressees are requested to so state if their plants have have not installed Westinghouse mechanical plugs from the subject heats."

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' U. S. Nuclear Regulatory Commission ELV-00615 - .

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. Response'

. References 1 and 2 of Bulletin 89-01_ indicate that plugs from heat numbers .  !

3279,"3513,-3962, and 4523 are not installed in any of the Vogtle steam  !

generators. ~ GPC has verified that this infOrmation is correct. GPC has installed a total of six Westinghouse mechanical tube plugs in Vogtle  !

steam generators (two plugs in Unit 1 and four plugs in Unit 2);-however,  ;

all of these plugs are from heat' number NX2387 and none are from the' heat -  ;

numbers referenced in Bulletin 89-01.  !

Action Requested 2.d " Installation of Westinghouse mechanical plugs from heats 3279, 3513,  ;

3962, and 4523 should be discontinued."

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, Response GPC will not install-any Westinghouse mechanical plugs from heat numbers

3279, 3513,- 3962, or 4523 in the Vogtle steam generators.

- Action Requested j

- 2.e " Westinghouse mechanical plugs removed from steam generators, regardless of heat number, should be examined for PWSCC on a sample basis for each heat. Addressees should' maintain a record of these examinations and the results should'be provided to Westinghouse to improve the' database concerning the susceptibility _ of plugs to PWSCC."

- Response.

GPC has not removed any Westinghouse mechanical plugs from the Vogtle steam generators at this time. GPC will ensure that Westinghouse mechanical plugs removed from the Yogtle steam generators, regardless of )

i heat number, will be examined- for PWSCC on a sample basis for each heat. I GPC will maintain a record of these examinations and the results will be provided to Westinghouse' to help improve the database concerning the susceptibility of plugs to PWSCC.

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Georgia Power A U. S. Nuclear Regulatory Commission ELV-00615 Page Three-This submittal completes the reporting requirements of NRC Bulletin 89-01 for l Vogtle Units 1 and 2. Please contact this office if you have any questions.

Mr. W. G. Hairston, III states that he is a Senior 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. I GEORGIA POWER COMPANY By: /tl. d. //.Y .E W. G. Hai rston, II; Sworn to and subscribed before me this /O day of June,1989.

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~ Notarf P~blic u  ;

hf CUEIRON EXPlRES DfC.15.10?2 WGH,III/1H/gm xc: Georgia Power Company Mr. C. K. McCoy  ;

Mr. G. Bockhold, Jr.  ;

Mr. J. P. Kane I NORMS I U. S. Nuclear Regulatory Commission Mr. S. D. Ebneter, Regional Administrator Mr. J. B. Hopkins, Licensing Project Manager, NRR Mr. J. F. Rogge, Senior Resident Inspector, Yogtle I i

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