ML18003A588

Confirms Exposure of Site Fault in West Auxiliary Dam Foundation.Schedules Mapping Documentation During Routine Mapping Sequence

ML18003A588
Person / Time
Site:	Harris
Issue date:	06/15/1979
From:	Mcduffie M CAROLINA POWER & LIGHT CO.
To:	Harold Denton Office of Nuclear Reactor Regulation
References
NUDOCS 7906150249
Download: ML18003A588 (3)

Text

REGULATORY NFORMATION DISTRIBUTION SYSTEM (RIDS) f ACCESSIOil NER:7900150249; OC,DATE; 79/00/15 NOTARIZED:

NO FACIL;bO"400 Shearon Har ris Nuclear Power Pl anti Unit li Carolina 50-401 Shearon Harris Nuclear Power Plant~

Unit 2p Carolina 50-402 Shearon Harris Nuclear Power Plantg Unit 3g Carolina AUTH,NAME AUTHOR AFFILIATION MCDUFFIE<M,A, Carolina Power 8 Light Co, RECIP, NAME RECIPIENT AFFILIATION DENTONEHRR9 Office of Nuclear Reactor Regulation

SUBJECT:

Confirms exposure of site fault in Hest auxiliary dam foundation. Schedules mapping documentation during routine mapping sequence, DISTRIBUTION CODE:

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09 GEOSCIEN BR 11 MECH ENG BR 13 MATL FNG BR 16 ANALYSIS BR 18 AUX SYS BR 20 I IC C

SYS BR 22 AD SITE TECH 27 EFFL TRT SYS 29 KIRKHOOD AD PLANT SYS AD SITE ANLYS IS MPA EXTERNAL: 03 LPDR 30 ACRS 1

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CRT Carolina Power & Light Company Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.

C.

20555 SHEARON HARRIS NUCLEAR POWER PLANT UNIT NOS. 1, 2, 3, AND 4 DOCKET NOS. 50-400, 50-401, 50-402, AND 50-403 EXPOSURE OF SITE FAULT IN WEST AUXILIARYDAM FOUNDATION

Dear Mr. Denton:

A fault was discovered in the plant excavation area on July 3, 1974, and traced by a series of fault exploration trenches to the auxiliary dam spill-way area.

At that time the fault was traced to trench FET 22W-74 which is at the top and northeast side of the auxiliary dam core trench.

Results of this fault investigation were reported by Carolina Power 6 Light Company to the NRC in a report entitled "Fault Investigation Shearon Harris Nuclear Power Plant Units 1, 2, 3, 4" dated February, 1975.

Based on that investigation and subsequent

hearings, the NRC concluded that this fault was not capable as defined in Appendix A to 10CFR 100.

As anticipated, excavation of the auxiliary dam core trench near the spillway has exposed this fault at Station 4+20.

This was verbally re-ported to your staff on May 8, 1979.

Because this fault was previously in-vestigated and concluded to be not capable, Carolina Power 6 Light Company does not intend to investigate this fault further.

The new exposure of the fault will be documented by mapping during the routine mapping sequence for that area of the auxiliary dam core trench.

Yours very truly, M. A. McDuf ie Senior Vice President Engineering and Construction MAM/tl cc:

Mr. James P. O'Reilly

~gg I/O 411 Fayetteville Street o P. O. Box 1551 o Raleigh, N. C. 27602 7 9061 50~'I9