ML20204C696

Trip Rept:Plant Visit & Meeting W/Applicant on 780905 to Discuss Remaining Open Issues Re Subj Facil.W/Summary of Remaining Unresolved Issues

ML20204C696
Person / Time
Site:	Diablo Canyon
Issue date:	10/06/1978
From:	Kuo P Office of Nuclear Reactor Regulation
To:	Hofmayer C Office of Nuclear Reactor Regulation
References
NUDOCS 7811290294
Download: ML20204C696 (4)

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• • • '007 6 1978 MEMORANDUM FOR: C. Hofmayer, Acting Branch Chief  ;

Structural Engineering Branch Division of Systems Safety N ~ g7f 32.3 ,

THRU: D. C. Jeng, Section A Leader 9k  ;

Structural Engineering Branch Division of Systems Safety i FROM: P.T. Kuo Structural Engineering Branch Division of Systems Safety

SUBJECT:

TRIP REPORT - PLANT VISIT AND MEETING WITH THE APPLICANT REGARDING THE REMAINING OPEN ISSUES ON DIABLO CANYON NUCLEAR PLANTS (SEB: 1111)

. I was given a tour of the Diablo Canyon Plant site by Mr. D. Landes and Mr. C. Li of PG and E and Mr. D. Lang of John A. Blume and Associates on September 5,1978. We walked through all major structures as wcll as sites of outdoor storage tanks. The following major modifications were in progress:

1. Addition of buttresses to the turbine builcing. _

2. Widening of the turbine pedestal gap in the E-W direction.

3. Modificatons of the foundations and additions of reinforced concrete shell to the outdoor water storage tanks.

Modification of the turbine pedestal has not yet started. I indicated to Messrs. Landes,1.1, and Lang, and they agreed, that the Dywidag coupler assemblies should not be installed until the test data is made avaliable to and reviewed by us.

On September 6 through September 8,1978, meetings were held to discuss the applicant's informal submittals in response to our previous concerns regarding the turbine building and outdoor storage tanks. The status of the submittals for the containment structure and the intake structure was also reviewed. A summary of the remaining unresolved items as of September 9,1978 is provided in the enclosure.

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. T. Kuo Structural Engineering Branch 7gg cpl Division of Systems Safety

Enclosure:

as stated

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cc: J. Knight J. Stolz D. Jeng D. Allison R. Lipinski l

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REMAINING UNRESOLVED ITEMS _ l AS OF SEPTEMBER _9, 1978 l

CONTAINMENT STRUCTURE

1. Justification for decoupling (A-3):

The applicant is to establish equivalency of the Diablo Canyon l Plant and the plant on which their conclusion was based.

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2. Calculations for overturning moment and stability of the l containment structure (A-5): l This item is currently under review.  !

3. Analysis for containment foundation mat (A-7): i The applicant is to provide a complete analysis for foundation '

I mat by 9/15/78.

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4. Stress anlaysis for diagonal rebars:

This item is currently under review.

5. Containment structural integrity test:

This item is currently under review.

INTAKE STRUCTURE

1. Analysis for ductility required for the piers (A-3 ): '

This item is currently under review. ,

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2. Foundationmatanalysis(A-4): -

This item is currently under review.

3. Analysis of overall stability (A-5):

This item is currently under review. l TU_RBINE BUILDING

1. Computatiori on ductility reauirement for nonlinear members (A-4):

The applicant originally proposed to exercise administrative control on parking locations of the crane so that the end bents would not undergo inelastic deformation. This control effectively eliminates the need for reviewing this item. However, during the subject meetings, the applicant requested that this calculation be reviewed by the staff on a low priority basis. The administrative control will not be discontinued until the review is completed.

2. Verification of computer codes used in the Analysis (A-7): l The applicant is to provide further verification for the program "MATRAN".

3. Assessment of the adequacy of turbine pedestal modifications and of the use of Dywidag couplers: .

The applicant is to provide further information regarding turbine  !

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2-pedestal modifications and description of procedures to be used for qualification of Dywidag coupler assemblies by 9/15/78.

The applicant will not install Dywidag coupler assemblies until its mechanical properties are provided and the review of these

• properties is completed by the staff.

4. Description of turbine building modifications:

This item is currently under review.

OUTDOOR WATER STORAGE TANKS The applicant is to provide a complete analysis of the outdoor water storage tanks containing mathematical models, shell stress analysis, stability analysis, and foundation analysis by September 15, 1978.

CRANES The applicant is to provide a complete analysis for cranes by September 15, 1978.  ;

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