ML20127A837

Highlights Status of Base Mat Crack Allegations

ML20127A837
Person / Time
Site:	Waterford
Issue date:	08/12/1983
From:	Jeng D Office of Nuclear Reactor Regulation
To:	Lear G Office of Nuclear Reactor Regulation
Shared Package
ML19263A633	List: IA-84-455, Forwards Evaluation of Concrete in Basemat,Waterford Unit Number 3. Despite Violations of Spec Requirements During Initial Concrete Pouring,Const Adequate to Ensure Structural Safety ML20127A144 ML20127A168 ML20127A834 ML20127A837 ML20127B613 ML20127C060 ML20128G376 ML20128G592 ML20128G691 ML20128G710 ML20128G767 ML20128G773 ML20128G790 ML20128G826 ML20128G847 ML20128G873 ML20128G899 ML20128G920
References
FOIA-84-455, FOIA-84-A-56 NUDOCS 8308180633
Download: ML20127A837 (2)

Text

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UNITED STATES u g NUCLEAR REGULATORY COMMISSION M > a WASHINGTON. D. C. 20555 4 ,o s *... .

K A\)G 1 2 1933 q MEMORANDUM FOR: George Lear Chief J Structural and Geotechnical Engineering Branch

% Division of Engineering a .

h. FROM: David C. Jeng, Leader

5 Structural Engineering Section A Structural and Geotechnical Engineering Branch Division of Engineering k

SUBJECT:

WATERFORD 3 BASE MAT CRACK ALLEGATIONS Based on information obtained from the Waterford 3 project manager James Wilson and the enclosed documents, the status of the subject issue is hibh11ghted below: ,

s

~

~1. The alleged containment basemat cracking at Waterford 3 was reported in May 1983. The cracks were identified by the observation of a 9 s} - small amount of water percolating through the top of the mat at several locations. The cracks are not visible to the naked eyes.

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2. Engineering studies were conducted by Ebasco, the A/E for the plant, to assess the potential impact of the alleged cracking on the structural

' integrity of the base mat.

3

3. NRC inspectors are monitoring the mat leakages and reviewing the results d

of the Ebasco studies. Furthennore, both NRC/I&E and Lousiana Power

& Light have separately initiated independent assessment of the potential

} 1mpact of the mat cracking and leakage upon its structural integrity.

s Reports from these independent reviews are scheduled to be issued on

s. September 1,1983.

> 4.

> Both Senator J. Bennett Johnston and Representative Gillis long have officially inquired about the allegatjon and requested NRC response on the .

issue. RIV has prepared a draft response to Rep. G. Long's inquiry on i

i behalf of Mr. W. J. Dircks (see enclosure).

I l Fo / A 45C l -

E /8.10 Casphepm @ W- .

.; } * ' . , -

I George Lear . .

5. It is our understanding that, presently, RIY and I&E have the lead responsibility on the issue. Pertinent DE technical branches have-not been officially requested to participate in the resolution of

~

' the issue. We (SGEB) are prepared and will be able to offer timely assistance to RIV and I&E-on the matter if and when such assistance .

is requested.

$w%a c- .,

David Jeng, Lead .

Structural Engineering Se ion A Structural and Geotechnica Engineering Branch i Division of Engineering 4_

Enclosure:

As stated \

, ' cc: R. Vollmer J. Knight J. Wilson P. Kuo F. Rinaldi ,

L. Heller e

L. ... . ,.

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