ML20215N276
| ML20215N276 | |
| 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: |
| References | |
| NUDOCS 8611050163 | |
| Download: ML20215N276 (3) | |
See also: IR 05000327/1986045
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UNITED STATES
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NUCLEAR REGULATORY COMMISSION
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WASHINGTON, D. C. 20555
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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
frorr the Office of Inspection and Enforcement, the Office of Nuclear Reactor
Regulation, consultants,' and the Region II Office.
.
The team concentrated lon 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, subiect 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
cri teria.
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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8611050163 861031
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ADOCK 05000327
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Mr. C. C. Mason
-2-
OCT 311!56
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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
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 y or, Director
o
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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OCT 3 1 se6
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cc w/ encl:
Tennessee Department of Public
Regional Administrator, Region II
Health
U.S. Nuclear Regulatory Commission.
ATTNi 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
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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
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R. L. Gridley
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Tennessee Valley Authority
5N 157B Lookout Place
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Chattanooga, Tennessee 37402-2801
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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
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H. L. Abercrombie
Tennessee Valley Authority
Sequoyah Nuclear Plant
P.O. Box 2000
Soddy Daisy, Tennessee 37379
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