ML20149C482
| ML20149C482 | |
| Person / Time | |
|---|---|
| Site: | 05000000, Sequoyah |
| Issue date: | 08/24/1987 |
| From: | Ebneter S NRC OFFICE OF SPECIAL PROJECTS |
| To: | White S TENNESSEE VALLEY AUTHORITY |
| Shared Package | |
| ML082310326 | List: |
| References | |
| FOIA-87-726 NUDOCS 8709030167 | |
| Download: ML20149C482 (4) | |
See also: IR 05000327/1987027
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UNITED STATESe
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NUCt. EAR REGULATORY COMMISSION
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.. 24, 1987
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August
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Docket Nos. 50-327
and 50-328
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Tennessee' Valley Authority
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ATTN: Mr. S. A. White
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Manager of Nuclear Power
6N 38A Lookout Place
1101 Market Street.
Chattanooga, Tennessee 37402-2801
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Gentlemen:
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SUBJECT: SEQUOYAH DESIGN CALCULATION REVIEW:' REPORT NOS. 50-327/87-27
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AND 50-328/87-27
This letter forwards the inspection report associated with the Sequoy6l design
calculation review inspection perfonned at: ypurf Knoxville, Tennessee offf res
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from June.1-5, 1987. This inspection report addresses the adeouacy of!
corrective actions resulting from the design calculation revie(program
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includi.ng NRC's previous inspection of this; program.
Prior to the performance of this irspectMh it was recognized by the hRC;
staff that a complete inspection could n2t be conducted in the civil / structural
area for two reasons:
(1) TVA had not sutnitted their updated calculation
review program description, requested by tne NRC during the exit meeting of
the previous calculation inspection on Rbruary 13, 1987 and again
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in writing in a March 5,1987 letter frog 2mes M. Taylor, then Director of
the Office of Inspection and Enfc. :ement .td Steven A. White, TVA Manager of
Nuclear Power and (2) there was additional work in process in TVA's~ Civd
Engineering Branch (CEB) that would not be completed prior'to the inspedtion.
The updated description of the calculation review program, recently submitted to
the NRC by letter from R. L. Gridley, Director, Nuclear Safety and Licensing
dated July 31, 1987, was necessary in the evaluation of'CEB because the staff
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had and still has concerns about the lack of a current review of Sequoyah
calculations previously performe1 by the CEB.
Further TVA efforts in this area
may be necessary dependinglon the results of the staff review of the TVA
submittal and insights gs,fned during the ongoing Integrated Design Inspection.
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During this calculatiori review inspection the team reviewed four-prograes
undertaken by CEB to determine theitechnical adequacy of the Sequoyah design:
(1) Miscel?aneous Structural Steel (SQN CEB,87-02); (2) Conduit and HVAC
Supports (SQN CEB 87-03); (3) Embeded Plates (SON CEB 87-04); and -(4) Civil /
Structural Regenerated Calculations (SQN,CEB 87-06). The TVA/CEB reviews
highlighted above' indicate that a signtf.icant number of problems exist with
,
newly regenerated calculations, many of ahich have been prepared by contract
personnel.
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August 24, 1987
Tennessee Valley Authority
One of the more significant open items in this inspection report is MEB-3
The team
which relates to the main feedwater system water hammer analysis.
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found that TVA had, in consideraticn of ' main feedwater line water hamer,
only evaluated the main feedwater check valves to assure that they would
maintain their function and integrity following the most severe feedwater
line break postulated. The TVA evaluation did not assess the main feedwater
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piping integrity and the increased loads transmitted to pipe snubbers.
TVA analysis performed on the Watts Bar main feedwater piping yielded snubber
water hamrur loads that were approximately 10 times greater than the snubber
seismic loads.
The team also noted ineffective implementation of a procedure to track unverified
assumptions made in calculations and also a lack of coordination between the
Mechanical, Electrical, and Nuclear Engineering Branches regarding responsibility
for determination of instrument setpoints.
A written response is requested from TVA addressing the observations identified
The NRC intends to follow your actions to resolve
in the enclosed report.
these items, therefore your response should be provided sufficiently in advance
The findings
of ;lanned restart of Sequoyah Unit 2 to allow for NRC inspection.
addressed in the enclosure were discussed by the teun in a mceting with TVA'
management at the conclusion of the inspection on Ane 5,1987.
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. Steven D. Richardson at (301) 492-9044 of this office.
Sincerely,
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Stewart D. Ebneter, Director
TVA Projects Division
Office of Special Projects
Enclosure:
Inspection Report 50-327/87-27
and 50-328/87-27
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cc w/ enclosure:
See n3xt page
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Mr. S. A. White
Sequoyah Nuclear Plant
Tennessca Valley Authority
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f.egional Administrator, Region II
Genera 1' Counsel
U.S. -Nuclear P,c;ulatory Connission
Tonnessea Valley Authority
101 Marietta Street, N.W.'
400 West Sunnit Hill Drive
Atlanta, Georgia 30323
E11 833
Knoxville, Tennessee 37902
Resident Inspecter/Sequoyah-NP
c/o U.S. Nuclear Pegulatory Connission
Mr. R. L. Gridley
2600 Igou Ferry Rcad
Tennessee Valley Authority
SN 157B Lookout Place
Soddy Daisy, Tennessec 37379
Chattanooga, Tennessee 37402-2801
Mr. Richard King
Mr. H. L. Abercrombie
c/o U.S. GA0
Tennessee Valley Authority
1111 North Shore Drive
Suite 225, Box 194
Sequoyah . Nuclear Plant
Knoxville, Tennessee 37919
P.O. Box 2000
Soddy Daisy, Tennessee 37379
Tennessee Department of
Public Health
Mr. M. R. Harding
Tennessee Valley Authority
ATTN: Director, Bureau of
Environmental Health Services
Sequoyah Nuclear Plant
Cordell Hull Building
P.O. Box 2000
Soddy Daisy, Tenc'
- s 37379
Nashville, Tennessee 37219
Mr. Michael h. Mobley, Director
Mr. D. L. Williams
Tennessee Valley Authority
Division of Radiological Health
400 West Sunnit Hill Drive
T.E.R.R.A. Building
150 9th Avenue North
W10 885
Knoxville, Tennessee 37902
Nashville, Tennessee 37203
County Judge
Familton County Courthouse
Chattanooga, Tennessee 37402
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Tennessee Valley Authority
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DISTRIBUTION
Docket File
DRIS R/F
RSIB R/F
SDEbneter, OSP
RWParkhill, NRR
EVImbro, NRR
CHaughney, NRR
8 Grimes, NRR
JPartlow, NRR
RArchitzel, NRR
JZwolinski, OSP
BLiaw, OSP
SRichardson, OSP
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JFair, OSP
RHerman, OSP
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- 8/ 7 /87
- 8/i //87
- 8/ N 87
IATE :8/ 7/87
- 8/ 7 /87
- 8/ 7 /87
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