ML20215N278

Forwards Special Insp Repts 50-327/86-45 & 50-328/86-45 on 860721-25.Preparations & Approach for Design Baseline & Verification Program in Accordance W/Program Plan,Subj to Listed Comments

ML20215N278
Person / Time
Site:	Sequoyah
Issue date:	10/31/1986
From:	Taylor J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
To:	Mason C TENNESSEE VALLEY AUTHORITY
Shared Package
ML20215N277	List: IR 05000327/1986045 ML20215N276 ML20215N278 ML20215N282
References
NUDOCS 8611050163
Download: ML20215N278 (3)

See also: IR 05000327/1986045

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UNITED STATES

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NUCLEAR REGULATORY COMMISSION

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OCT 31 iB86

Mr. C. C. Mason

Acting Manager of Nuclear Power

Tennessee Valley Authority

6N, 38A Lookout Place

1101 Market Street

Chattanooga, TN 37402-2801

Gentlemen:

SUBJECT:

REPORT NOS. 50-327/86-45 AND 50-328/86-45

On July 21-25, 1986, the NRC staff conducted a special inspection to examine

TVA's Design Baseline and Verification Program (DBVP) for the Sequoyah Nuclear

Power Plant at the Division of Nuclear Engineering offices in Knoxville,.

Tennessee.

The NRC inspection comprised a multi-discipline team of personnel

from the Office of Inspection and Enforcement, the Office of Nuclear Reactor

Regulation, consultants, and the Region II Office.

The team concentrated on the various design basis documents to be used in the

DBVP, including the commitment / requirement data base and both system and

general design criteria.

The team also reviewed program procedures and plans

and the action items resulting from independent oversight of this program by

TVA's Engineering Assurance group.

As a result of the inspection, the NRC team concluded that the preparations and

approach for the program were in most cases in accordance with the program

plan, subject to the following general-comments.

The Engineering Assurance oversight was not as thorough or as technically

oriented as anticipated by the inspection team.

Increased Engineering Assur-

ance oversight is needed to verify the accuracy of the commitment / require-

ment data base and inclusion of commitments and requirements in the design

criteria.

The team identified several cases where commitments and requirements applicable

to selected design criteria were not captured.

Environmental Qualification

requirements were found to be incorporated in an inconsistent manner among

various design criteria.

The team also identified missing requirements in the

design criteria for the neutron monitoring system, apparently at the interface

between the NSSS and TVA.

These findings, collectively, raise a concern

regarding the comprehensiveness of the design criteria.

The computerized list of licensing commitments and design requirements called

the " Commitment / Requirement Data Base," developed by TVA/Impell, was not

independently verified.

Although Quality Assurance controls were not applied

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Mr._C. C. Mason

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OCT 31 m

to the information retrieval process, the Engineering Assurance group had

conducted reviews in this area on a sampling basis which we consider to be

inadequate. This data base forms a large portion of the basis for the newly

issued design criteria documents which in turn will be used by TVA to evaluate

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the technical adequacy of design changes in the scope of the DBVP. Therefore,-

TVA should clearly define their basis for concluding that the commitment /

requirement data base have accurately captured all licensing commitments,

regulatory requirements and other pertinent design information as applicable,

e.g., NSSS/ vendor interface requirements, and that the appropriate commitments

and requirements have been incorporated in the applicable design criteria.

Although no written response is requested from you addressing the observations

identified in the enclosed report, the NRC intends to follow your. actions to

resolve these items during future inspections. The findings addressed in the

. enclosure were discussed by the team in a meeting with TVA management at the

conclusion of the inspection.

In accordance with 10 CFR 2.790(a), a copy of

this letter and the enclosure will be placed in the NRC Public Document Room.

Should you have any questions concerning this inspection, please contact me or

Mr. Gene Imbro ((301) 492-9671) of this office.

Sincerely, /

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.T

or, Director

Of ice of nspection and Enforcement

Enclosure:

Inspection Report 50-327/86-45

and 50-328/86-45

cc w/ encl:

See Page 3

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Mr. C. C. Mason

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cc w/ enc 1:

Tennessee Department of Public

Regional Administrator, Region II

Health

U.S. Nuclear Regulatory Commission,

ATTN:

Director, Bureau of

101'Marietta Street, N.W., Suite 2900

Environmental Health Services

Atlanta, Georgia 30323

Cordell Hull Building

Nashville, Tennessee 37219

J. A. Kirkebo

ATTN:

D.L. Williams

Mr. Michael H. Mobley, Director

Tennessee Valley Authority

Division of Radiological' Health

400 West Summit Hill Drive, W12 A12

T.E.R.R.A. Building

Knoxville, Tennessee 37902

150 9th Avenue North

Nashville, Tennessee 37203

Mr. Bob Faas

Westinghouse Electric Corp.

County Judge

P.O. Box 355

Hamilton County Courthouse

Pittsburgh, Pennsylvania 15230

Chattanooga, Tennessee 37402

R. L. Gridley

Tennessee Valley Authority

SN 1578 Lookout Place

Chattanooga, Tennessee 37402-2801

M. R. Harding

Tennessee Valley Authority

Sequoyah Nuclear Plant

P.O. Box 2000

Soddy Daisy, Tennessee 37379

Resident Inspector /Sequoyah NPS

c/o U.S. Nuclear Regulatory Commission

2600 Igou Ferry Road

Soddy Daisy, Tennessee 37379

H. L. Abercrombie

.

Tennessee Valley Authority

Sequoyah Nuclear Plant

P.O. Box 2000

Soddy Daisy, Tennessee 37379

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