W3P84-3152, Forwards Suppl to Addl Info Re Basemat Hairline Cracks. Muenow & Assoc,Inc Performed Ultrasonic Testing of Interface Between Top of Basemat & Bottom Fill Concrete.Test Confirms Sonic Energy Not Penetrating Fill Concrete

Forwards Suppl to Addl Info Re Basemat Hairline Cracks. Muenow & Assoc,Inc Performed Ultrasonic Testing of Interface Between Top of Basemat & Bottom Fill Concrete.Test Confirms Sonic Energy Not Penetrating Fill Concrete

ML20204G968
Person / Time
Site:	Waterford
Issue date:	11/07/1984
From:	Cook K LOUISIANA POWER & LIGHT CO.
To:	Crutchfield D Office of Nuclear Reactor Regulation
References
W3P84-3152, NUDOCS 8411120110
Download: ML20204G968 (7)

Text

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( Y LOUISIANA 242 OaAnoN - sraeEr P O W E R & L I G H T! P. O. BOX 600NEW "

ORLEANS, LOUISIANA 70174 . (504) 366-2345 sus $SYS November 7, 1984 t

W3P84-3152 3-A1.16.07 3-A1.'01. 04 A4.05 Director Of Nuclear Reactor Regulation ATTN: Mr. Dennis M. Crutchfield, Asst. Director for Safety Assessment Division of Licensing U.S. Nuclear Regulatory Commission Washington, D.C. 20555

SUBJECT:

WATERFORD 3 SES ADDITIONAL INFORMATION ON BASEMAT HAIRLINE CRACKS

References:

1. Letter W3P84-3044, K.W. Cook to D.M. Crutchfield, dated October 26, 1984.

2. Letter W3P84-3142, K.W. Cook to D.M. Crutchfield, dated November 7, 1984.

3. Letter, D.M. Crutchfield to J.M. Cain dated October 19, 1984.

Dear Mr. Crutchfield:

The purpose of this letter is to supplement the additional information, provided in References 1 and 2, in response to the requests in your letter of October 19, 1984.

A report detailing the ultrasonic testing results on the hairline cracks in the basemat, performed by Meunow and Associates, was suomitted by Reference 1 for staff review. On November 2,1984, the NRC staff requested LP&L to provide confirmation that the locations internal discontinuities under the Reactor Containment Building can be related to the mat concrete and are not affected by the fill concrete above the mat. Muenow and Associates, Inc. has performed ultrasonic testing of the interface between the top of the basemat and the

- bottom of the fill concrete. These results are summarized in the attached supplement to the report issued via Reference ?.. The tests did indeed confirm the original assumption that sonic energy was not penetrating the fill concrete to a significant degree and that the internal reflectors identified are located in the haaamat concrete.

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? W3P84-3152 Page'2-If. .you.have. any quest' ions .regarding the transmittal please call.

Very truly yours,

. . Cook' khC.

Nuclear Support & Licensing Manager KWC:sms'

~ ATTACHMENT-cc: - E.L. - Blake (NRC) , G.L. Constable (NRC), W.M. Stevenson, J.T. Collins (NRC),

.J.H. Wils'on (NRC) -

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~, MATERIALS AND MONDESTRUCT!vE TESTING I f 3940 HUNTCUFF OR.

d. CHARLOTTE. NORTH CAROUNA 28211 (704) 377 4041 .(704) 542 2223 i

APPENDIX No.5' -

NONDESTRUCTIVE TEST EVALUATION OF BASEMAT CONCRETE UATERFORD No. 3 LOUISIANA: POWER AND LIGHT CO.

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^ _On November 7, 1984,~a series of NDT pulse echo ~ tests were conducted at the.Waterford.No. 3 plant-of thE Louisiana Power and Light Co. The purpose of four: additional investigation was based upon inquiries by the NRC and their

. consultant,.Brookhaven National Laboratories, as to adhesion or bonding 5etween fill concrete within the RCB and foundation mar concrete,

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c . In specific; the question was, "how can the location of internal

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, discontinuities.be pinpointed to the mar. concrete and not actually located in the fill concrete".

.Our answer, at the time of inquiry was, "that by ?ransducer test-

locations and manipulation, we felt-that the transmitted sonic energy never entered the-fill concrete because of a nonbond cendition at that interface".

(However,ithis assumption was based upen indirect test data and it was

--suggested, that a more direct test program be conducted. As a result, a

. series'of tests using 0* and 45* transducers, see drawing number 1, were Y A conducted from the top of fill concrete, around the annulus, down to the

- - mat-fill. concrete interface. See drawings numbered 2 for test locations.

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s Liest ~ criteria was set'at 50 feet of vertical time propagation for our O'

. , transducer;;and a false back reflector was set at 100 feet of time propagation w/

.for1 our 45' transducer. Both eine propagation limits allowed for sufficient travel. time to penetrate the mat-fill interface by at least 15 to 20 percent cf total travel distance. As a point'of interest, illustrating that rise pulse echousystem'was. operating within its estabitshed guidelines; noncontinuous internal discontinuities were identified at approximatelv 15 feet above the

' mat-fill' concrete interface. These reflectors were identified to be a " shelf Eof concrete'.' used during construction to support an "A" frame structure for containment vessel erection..

/ Test' data indicates that a nonbond condition exists at 20 of our 24 rest locations. This substantiates our original assumption; that sonic energy could.not be penetrating the fill' concrete, and that internal reflectors are i

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). located'in ths mr.t concrete.

At test locations 9, 17, 19 and 22 minor amounts of bond were apparent as

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evidenced by a reflection from the basemat botton. 1However, strong amplitude

. reflectors were' received from the mat-fill concrete interface, also. These strong amplitude reflectors would indicate that.only minor amounts of energy vere transmitted through the-interface, with a majority of the energy reflecting'from the mat-fill concrete interface.

.Itlvould be our opinion, based upon this test program-and prior test

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1 data, that sufficient nonbonding exists at the mat-fill concrete interface to (preclude' sonic. energy fron entering and reflecting from the fill concrete i~

interior. Furthernore, the intermittent character of the slight bond, that

- f~') 'does exist, . would not be capable of producing the positive and high amplitude LJ reflectors upon which'our original crack location data is based.

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