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Forwards Insp Repts 50-327/87-14 & 50-328/87-14 on 870302-13.Results of Insp Concludes That Design Baseline & Verification Program Conducted within Scope of Program Areas Inspected to Date
	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: IR 05000327/1987014; ML20215B746;
References
	NUDOCS 8706170433
	Download: ML20215B746 (4)
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% UNITED STATES

No

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% :8" NUCLEAR REGULATORY COMMISSION

' WASHINGTON, D. C. 20555

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g*****f 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 !

'

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 ,

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 !

reviewed DBVP program procedures and plans and the action items resulting from l

-independent oversight of_this program by TVA's Engineering Assurance group.

]

. The inspection team also evaluated TVA's actions in response to previous NRC

design control and DBVP' inspection reports. In this evaluation, the'NRC

assessed TVA's corrective and preventive measures detailed in your letters 4

dated December 31,'1986 (revised response'to Inspection Report 86-27), j

February.3,.1987(response _toinspectionreports86-38and86-45),and i

April 22, 1987 (response to inspection report 86-55 and revised responses for

items remaining open from other design control related inspection reports).

J

As a result'of the inspection, the NRC team concluded that the DBVP was generally 1

conducted in accordance with the program plan. Implementation by both the DBVP j

project and Engineering Assurance groups appears to be adequate in most instsnces 'l

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 i

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 ,

480V shutdown boards. 1

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8706170433 870604

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PDR .ADOCK 05000327

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Tennessee Valley Authority -2- 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 ,

team noted that in certain cases the report did not identify interdisciplinary !

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 l

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 i

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. l

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

' ' * ,i

-

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'

LTennessee Valley Authority -3- June 4, 1987

~

cc w/ enclosure:

Tennessee Department of.Public Health-

ATTN: Director, Bureau of Environmental

. Health Services-

LCordell Hull-Building.-

Nashville,-Tennessee 37219

'J. Kirkebo . . .

.

Tennessee Valley' Authority .

.400 West Summit Hill Drive W12, A12

.

jl

Knoxville, Tennessee ~ 37902

.

.Mr. Bob;Faas.

Westinghouse' Electric . Corp. -

P.O.: Box 355

Pittsburgh, Pennsylvania .15230

R. L. Gridley .

Tennessee Valley Authority.

SN 157B L'ookout Place

Chattanooga,. Tennessee 37402-2801 :j

-

'N.'.R. Harding .

.

Tennessee Valley Authority

Sequoyah Nuclear Plant ,

P.O. Box:2000 !

i

.,. . Soddy Daisy,7 Tennessee' 37379

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 !

T.E.R.R.A. Building

150 9th Avenue North

Nashville, Tennessee. 37203

County Judge

Hamilton, County Courthouse l

Chattanooga, Tennessee 37402

!

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Tennessee Valley.' Authority - 4 -- ' June 4 -1987

Distribution:-(w/ encl)

DCS (Docket No._50-327/328) ,

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' SIB' Reading '

'EVImbro, NRR' ,

BKGrimes, NRR l

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SRichardson, OSP

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BDLiaw,.OSP

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KBarr, RII

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ELJordan, AE0D

InspectionTeam'(8)

'JFair, OSP

Resident Inspector'

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_ _ _ _ _ : _ _ . . . _ _ _ _ _ _ _ _ : _ . . . . . _ _ _ _ _ _ : _ &_ . _ _ :

__ .:. _ _.....

[es?CJHaughney : es low :GGZe h Ebneter

.NAME :REArchitzel :EVImbro j_ _____.:.__ ....

.....:......... __..:___________ .: __ ... ____:..___ .... _, ____________:_ _

04/.!>/87 :04/JP/87 :047f/87 :0 ( /87 : Ts/87 :4/F/87

=DATE :04/h/87

_________ _ __

ML20215B746

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