ML20215B746
| ML20215B746 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 06/04/1987 |
| From: | Ebneter S NRC OFFICE OF SPECIAL PROJECTS |
| To: | White S TENNESSEE VALLEY AUTHORITY |
| Shared Package | |
| ML20215B748 | List: |
| References | |
| NUDOCS 8706170433 | |
| Download: ML20215B746 (4) | |
See also: IR 05000327/1987014
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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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June 4,_1987'
Docket Nos. 50-327
and 50-328
' Tennessee Valley Authority-
ATTN: 'Mr. S. A. White
Manager of Nuclear Power
6N 38A Lookout. Place
1101 Market Street
Chattanooga, TN - 37402-2801
Gentlemen:
I
SUBJECT:
REPORT NOS. 50-327/87-14 AND 50-328/87-14
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This letter forwards the results of a special inspection of TVA's Design Baseline
and Verification Program (DBVP) for the Sequoyah Nuclear Power Plant, conducted
at the plant site on March 2-13. 1987. The NRC inspection was comprised of a
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multi-discipline team of personnel from the Office of Inspection and Enforcement,-
consultants, and.the Region II Office. The team concentrated on the. System
-Evaluation Reports, documenting the conclusions of the DBVP. _The team.also
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reviewed DBVP program procedures and plans and the action items resulting from
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-independent oversight of_this program by TVA's Engineering Assurance group.
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The inspection team also evaluated TVA's actions in response to previous NRC
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design control and DBVP' inspection reports.
In this evaluation, the'NRC
assessed TVA's corrective and preventive measures detailed in your letters
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dated December 31,'1986 (revised response'to Inspection Report 86-27),
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February.3,.1987(response _toinspectionreports86-38and86-45),and
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April 22, 1987 (response to inspection report 86-55 and revised responses for
items remaining open from other design control related inspection reports).
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As a result'of the inspection, the NRC team concluded that the DBVP was generally
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conducted in accordance with the program plan.
Implementation by both the DBVP
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project and Engineering Assurance groups appears to be adequate in most instsnces
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sampled.by the inspection team within the scope of the program areas insperced
to.date.
Results of the inspection are presented in the enclosure. Most significant
among the inspection. team's observations are the following:
(1) A potential common'cause failure exists in the design of Sequoyah HVAC
equipment in that air handling units are' designed to trip off on high
temperature (85F). The temperature sensors for fans cooling redundant
480 volt electrical board rooms are located close to each other. There-
fore, a temperature above 85'F may result in loss of HVAC to redundant
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480V shutdown boards.
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8706170433 870604
PDR .ADOCK 05000327
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Tennessee Valley Authority
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June 4, 1987
(2) TVA-has not established and implemented periodic surveillance. tests which
will verify automatic standby features of the diesel building exhaust
ventilation fans and various fans associated with safety-related auxiliary
building air handling units.
(3) Walkdown drawing discrepancies have been directly incorporated into the
drawings, without performing engineering evaluations of the discrepancies.
(4) The DBVP had determined that component labeling errors did not constitute
restart items and that certain inadeauately performed post modification-
tests did not need to be completed prior to restart. These determinations
were questioned by the team.
During a review of the preliminary DBVP report following the inspection, the
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team noted that in certain cases the report did not identify interdisciplinary
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technical problems and large groups of items appear to be mischaracterized as
random occurrences.
A written response is rMuested from TVA addressing the observations identified
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in Appendix A of the enclosed report. The NRC intends to follow your actions
to' resolve' these items.
An inspection to evaluate TVA's corrective actions for items identified by the
- 1BVP and by the various NRC design control inspections. is planned for June
1987, but will depend on the state of completion of TVA's corrective actions.
This inspection will include an assessment of restart decision makirg.by eval-
uating on a sampling basis the corrective actions TVA intends to defer until
after restart. The inspection will also assess the adequacy of both proposed
.and completed corrective actions.
Intaccordance with 10 CFR 2.790(a), a copy of this letter and the enclosure will
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be placed in the NRC Public Document Room.
Should you have any questions concerning this inspection, please contact me or
Mr. Gene Imbro (301) 492-9664.
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Sincerely,
k b l N [@,
tewart D. Ebneter, Director
TVA Projects Staff
Office of Special Projects
Enclosure:
Inspection Report 50-327/87-14
and 50-328/87-14
cc w/ enclosure:
See next page
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LTennessee Valley Authority
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June 4, 1987
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cc w/ enclosure:
Tennessee Department of.Public Health-
ATTN: Director, Bureau of Environmental
. Health Services-
LCordell Hull-Building.-
Nashville,-Tennessee 37219
'J. Kirkebo . .
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Tennessee Valley' Authority
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.400 West Summit Hill Drive W12, A12
Knoxville, Tennessee ~ 37902
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.Mr. Bob;Faas.
Westinghouse' Electric . Corp. -
P.O.: Box 355
Pittsburgh, Pennsylvania .15230
R. L. Gridley
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Tennessee Valley Authority.
SN 157B L'ookout Place
Chattanooga,. Tennessee 37402-2801
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'N.'.R. Harding .
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Tennessee Valley Authority
Sequoyah Nuclear Plant
,
P.O. Box:2000
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. Soddy Daisy,7 Tennessee' 37379
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Resident Inspector /Sequoyah NPS
c/o U.S. Nuclear. Regulatory Commission-
2600 Igou-Ferry Road
Soddy Daisy, Tennessee; 37379
Regional Administrator, Region II
U.S. Nuclear Regulatory Commission
101 Marietta Street, N.W., Suite 2900
Atlanta, Georgia 30323.
Mr. Michael H. Mobley, Director
Division'of Radiological Health
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T.E.R.R.A. Building
150 9th Avenue North
Nashville, Tennessee. 37203
County Judge
Hamilton, County Courthouse
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Chattanooga, Tennessee 37402
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Tennessee Valley.' Authority
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' June 4 -1987
Distribution:-(w/ encl)
DCS (Docket No._50-327/328)
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DRIS' Reading.
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' SIB' Reading
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'EVImbro, NRR'
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BKGrimes, NRR
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JGPartlow,~NRR
REArchitzel, NRR
JGKeppler, OSP
'JAxelrad, OSP
SRichardson, OSP
GZech, OSP-
BDLiaw,.OSP
. R4cCoy, RII
KBarr, RII
BBHayes. 01
SRConnelly, OIA
ELJordan, AE0D
InspectionTeam'(8)
'JFair, OSP
Resident Inspector'
.NSIC'
WCline, RII
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Ebneter
.NAME :REArchitzel
- EVImbro
[es?CJHaughney
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.....:......... __..:___________ .: __ ... ____:..___ .... _,
=DATE :04/h/87
- 04/.!>/87
- 04/JP/87
- 047f/87
- 0 ( /87
Ts/87
- 4/F/87
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