ML20104A936

Forwards Reactor Vessel Cavity Seal Test Results, in Response to IE Bulletin 84-03.Operating Units Meet Min Acceptance Criteria for Seal Capacity.No Mods Required

ML20104A936
Person / Time
Site:	Mcguire, Catawba, McGuire, 05000000
Issue date:	01/18/1985
From:	Tucker H DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20104A941	List: ML20104A936 ML20104A960
References
IEB-84-03, IEB-84-3, NUDOCS 8502010581
Download: ML20104A936 (2)

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..'.t DUKE POWER GOMPANY P.O. BOX 03180 CHARLOTTE,N. g8242 HALB. TUCKER

.... vdh g Pg,. Teternown poy amsa January 18, 1985 Mr. James'P. O'Reilly, Regional Administrator U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323

Subject:

McGuire Nuclear Station Catawba Nuclear Station Docket Nos. 50-369 and 50-370; 50-413 and 50-414 NRC/0IE Bulletin 84-03

Dear Mr. O'Reilly:

Mr. R. C. DeYoung's (NRC/01E) letter dated August 24, 1984 transmitted NRC/0IE Bulletin 84-03 which concerned an incident in which the refueling cavity water seal failed and rapidly drained the refueling cavity, and requested certain actions to assure that fuel uncovery during refueling remains an unlikely event.

My letter of November 21, 1984 submitted Duke Power Company's response to this bulletin for the McGuire and Catawba Nuclear Power Stations which provided a summary of our evaluation of the potential for and consequences of a refueling cavity water seal failure for the McGuire and Catawba Nuclear Stations. Although the original seal was designed and tested by the manufacturer establishing the adequacy of the seal configuration, our response indicated that a reevaluation of the seal integrity would be conducted via subjecting the seal configuration used at McGuire and Catawba to a series of tests designed to determine the ultimate capacity of the seals (if the minimum acceptance criteria is not met on any test the seal was to be modified as necessary to obtain the required capacity). The response stated that the testing was scheduled to start (at

.McGuire) the week of November 26, 1984 and to be completed the week of December 3, 1984, with the results along with a description of any planned modifications (if necessary) to be provided by December 31, 1984. However, since this testing was not actually performed until December 17-21, 1984 (as documented in my December 31, 1984 letter), the submittal date for the test results was revised to January 31, 1985 or prior to the McGuire Unit 2/ Cycle 2 refueling outage, whichever was earlier.

Please find attached the test results report. Based on an evaluation of the test results, it is concluded that McGuire Unit 1 and Catawba Unit 1 meet the minimum acceptance criteria with regard to seal capacity, and seal modifications are not required. McGuire Unit 2 as-built dimensions are scheduled to be recorded during the upcoming Cycle 2 refueling outage (currently scheduled to begin January 25, 1985). This will be evaluated against the test results and compared to the min-imum acceptance criteria. Catawba Unit 2 is under construction. The test report will be revised and resubmitted when the remaining as-built data is recorded and subsequent evaluations completed (to determine the adequacy of the seals or if of a Ph $$//

s modifications, and Catawba Unitand2. therefore further testing, is required) for McGuire Unit 2 of a seal capacity to withstand twice the normal static head of wate .

Please advise if there are any questions or if further information is required.

I declare under penalty of perjury that the statements set forth herein are true and correct to the best of my knowledge.

Very truly yours.

C' cd a-Hal B. Tucker N' PBN/glb Attachment cc: Mr. R. C. DeYoung, Director Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission Washington, D. C. 20555 Document Control Desk U. S. Nuclear Regulatory Commission Washington, D. C. 20555 Mr. W. T. Orders NRC Resident Inspector McGuire Nuclear Station P. K. VanDoorn NRC Resident Inspector Catawba Nuclear Station

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