ML20151X988

PNO-77-183:during Routine Insp in Aug 1977,licensee Discovered Cracks in Reinforced Concrete Svc Water Intake Tunnel.Licensee Evaluation in Progress.Media Interest Not Expected.State of Sc Notified

ML20151X988
Person / Time
Site:	Summer
Issue date:	10/14/1977
From:	Dreher F, Moseley N, Reinmuth W NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
To:
References
PNO-77-183, NUDOCS 9809180046
Download: ML20151X988 (1)

Text

f()(L Q),GnvMA fag (2W $ /LAWW ' "' ~

l PRELIMINARY NOTIFICATION October 14, 1977 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PN-77-183 l This preliminary notification constitutes EARLY notice of an event of POSSIBLE safety or public interest significance. The information

, presented is as initially received without verification or evaluation and is basically all that is known by IE staff as of this date.

FACILITY: South Carolina Electric and Gas Company Virgil C. Summer Nuclear Station Docket No. 50-395 ~

Fairfield County, South Carolina 4

SUBJECT:

INTAKE ,TRUCTURE SETTLEMENT During routine inspection in August 1977, the licensee discovered I cracks in the reinforced concrete service water intake tunnel. Followup examination of the pump house structure and the intake tunnel showed l i

settlement of 8-1/2 inches. The net settlement predicted by the designer I was 6-7 inches after credit for 2 inches of rebound when the reservoir is filled. Current indications are that final settlement could be on the order of 18 inches. The licensee reports that this value would not cause unacceptable structural damage or operational problems. The 36 inch dis- 1 i charge pipe from the pump house to the reactor building, and the 36 inch I i

make up supply pipe from the main cooling water pump house to the service '

_;_ _ water reservoir pump house have not been installed. Installation will be . .

mi$e deferred. j

~

! The licensee's evaluation is in progress. At present, the licensee does , I not believe that extensive repairs will be required nor that the core loading date will be affected. Construction of the plant is approxi-  !

mately 50 percent completed. l Media interest in not expected. The State of South Carolina has been notified. 8 A news release is not planned by the licensee or NRC. -IE inspectors are A at the site. O Region II (Atlanta) received original notification of this occurrence by 7 telephone from the licensee quality assurance manager on August -30,1977 - " "i and has been periodically advised of further settlements. This information l is current as of 2:00 p.m. on October 13, 1977. l

Contact:

FADreher, IE x27551 WReinmuth, IE x27551 NCMoseley, IE x28484 a

i

( Distribution:

Chairman Hendrie Transmitted H St ?! N ;

Comissioner Bradford 5

$ Commissioner Kennedy S. J. Chilk, SECY C. C. Kamerer, CA 8$@y Comissioner Gilinsky i (For Distribution) i co-N Transmitted: MNBB i: ou P Bldg T o E. Volgenau IE Ei L. V. Gossick, ED0 E. G. Case, NRR Region .3T 3to

@@ S. H. Hanauer, EDO l o@AL Q J. J. Fouchard, PA SS Bldg I! O g (MAIL)

W. G. Mcdonald, MIPC C. V. Smith, NMSS R. J. McTiernan, OIA R. G. Ryan, OSP R. Minogue, SD H. K. Shapar, ELD 1

PRELIMINARY NOTIFICATION l