ML20132C652

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Responds to Encl Re Constituent Mh Schwartz on Resumption of Concrete Work at Site
ML20132C652
Person / Time
Site: 05000000, Marble Hill
Issue date: 06/25/1981
From: Dircks W
NRC OFFICE OF THE EXECUTIVE DIRECTOR FOR OPERATIONS (EDO)
To: Snyder G
HOUSE OF REP.
Shared Package
ML20132B505 List:
References
FOIA-84-293 NUDOCS 8108170195
Download: ML20132C652 (8)
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Text

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The Honorable Gene M. Snyder D '. . . O a .3317.- $

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Dear Congressman Snyder-

/Ch I am pleased to respond to your letter dated May 22, 1981 in which you for-

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warded a letter from one of your constituents concerning resumption of con-crete work at the Marble Hill Nuclear Power Station construction site.

I can assure you that the decision to authorize concrete placement was made only after a thorough review of the improvements made i.n the construction quality assurance the existing program and after verification of the structural adequacy of concrete.

The verification program consisted of extensive testing and examination of the concrete by Public Service of Indiana and its consultants, review of test findings made during the actual concrete placement, and a review of previous NRC inspection findings.

tion from Save the Vallay, an area environmental group, that outside con-In addit sultants review the concrete work to provide additional assurance to area residents.

NRC reviewretained the work. two civil engineering experts, Alfred Parme and Rolland Hamm, to In addition, Save the Valley's consultant, Professor Michael Cassaro, was permitted to accompany the NRC consultants and to have access to the same information as the consultants. It was never the intent that the decision on resumption of concrete work would depend on submittal of a final report from the two NRC consultants. NRC planned to, and in fact did confer with the work.

concrete NRC consultants prior to permitting resumption of safety related the existing concrete was structurally sound.The consultants verbally reported This finding will be documented in a final report, which will also include a review of the repairs of surface defects that could not be undertaken until work resumed at the site.

Professor Cassaro questioned the adequacy of one portion of the construction verification program, the " ultrasonic" testing of sample areas of concrete.

His view is that the number of sample areas did not meet the NRC's previously established statistical criteria for the testing. Our review of the testing I program, however, determined that the sample testing did meet the criteria and was sufficient to determine that there are no significant internal defects in the concrete.

of concrete were cut out of various locations in the plant The and tested.In test results further confirmed the adequacy of the concrete.

In conclusion, :

can assure you that the U.S. Nuclear Regulatory Commission is most concerned appropriate that standards the Marble and Hill When ations. clant significan be built in accordance with the k lems were found MgroWMk CF T.L6tD6LY")(V Y*' ~'W 6

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The Honorable Gene M Snyder with the utility's construction and quality assurance programs in 1979, we did not hesitate to stop all safety-related construction work. Only after major revamping of the construction management and quality assurance systems was some work permitted to resume in December 1980, and concrete work was not permitted to resume until March 1981, 19 months after work was stopped.

It is not correct, as your constituent suggests, that NRC failed to keep its word on the resumption of concrete work. The views of the consultants were to be one portion of the information assessed in permitting work to resume, but it was not expected that the consultants' final report would be a prerequisite to making the decision. The decision to permit resumption of concrete work at Marble Hill was made only after extensive inspection of work at the site and review and evaluation of the upgraded management and quality assurance programs, as well as soliciting the findings of the consultants.

When the consultants' report is completed, within about one month, it will be publicly available. NRC documents on Marble Hill are available for inspection and copying at the Madison-Jefferson County Public Library in Madison, Indiana.

Included in the documents available are Professor Cassaro's letters to NRC on the sampling program and NRC's replies.

I trust this information satisfies your concerns and those of your constituents.

Sincerely ~,

(Q::e1)Wiii r.J. Dircks William J. Dircks Executive Director for Operations Distribution:

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with tha utility's construction and quality assurance programs in 1979, we did not hegitate to stop all safety-related construction work. Only after major rev ' g of the construction management and quality assurance systems was some work ermitted to resume in December 1980, and concrete work was not permitted to rehsme until March 1981, 19 months after work was stopped.

It is not correct, a our constituent suggests, that NRC failed to keep its word on the resumption f concrete work. The views of the consultants were to be one portion of the in mation assessed in permitting work to resume, but it was not expected that th onsultants' final report would be a prerequisite to making the decision. The C staff permitted concrete work to resume at Marble Hill only after extensiveq inspections and review of work at the site and the upgraded management and qbality assurance programs, as well as soliciting the findings of the consultants.

When the consultants' report is complet , within about one month, it will be publicly available. NRC documents on Mar e Hill are available for inspection and copying at the Madison-Jefferson County ublic Library in Madison,' Indiana.

Included in the documents available are Profe or Cassaro's letters to NRC on the sampling program and NRC's replies.

I trust this information satisfies your concerns an those of your constituents.

Sincerely, N

's William J. Dircks N Executive Director for Opevations Distribution: '

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i 80 M N ..,,,n, o. . 5/27/81 NRC SECRETARIAT TO: O comm. on., o. .

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To: Hendrie o.t. 5/22/81 son,.ct. ennenened about the confusionaround u m ,- mee nn the nivality nf the enn<:tr of the Marble u411 'f a r-Oe sv vor n u,.or:

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