ML20210A731

Forwards Insp Repts 50-327/86-38 & 50-328/86-38 on 860609-20.Weaknesses in Implementation of Design Baseline & Verification Program,Including Inconsistencies Between Units 1 & 2 Walkdowns,Listed

ML20210A731
Person / Time
Site:	Sequoyah
Issue date:	09/15/1986
From:	Taylor J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
To:	White S TENNESSEE VALLEY AUTHORITY
Shared Package
ML20210A737	List: IR 05000327/1986038 ML20210A731
References
NUDOCS 8609170325
Download: ML20210A731 (5)

See also: IR 05000327/1986038

Text

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• NUCLEAR REGULATORY COMMISSION

UNITED STATES

'j WASHINGTON, D. C. 20555

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Mr. S. A. White

Manager of Nuclear Power

Tennessee Valley Authority

'

6N, 38A Lookout Place

1101 Market Street

Chattanooga, TN 37402-2801

Dear Mr. White:

SUBJECT: REPORT NOS. 50-327/86-38 AND 50-328/86-38

'

On June 9'- 20, 1986, the NRC staff conducted a special inspection to examine

the Design Baseline and Verification Program (DBVP), including independent

oversight by TVA Engineering Assurance, for the Sequoyah Nuclear Power Plant.

, The NRC inspection comprised a multi-discipline team of personnel from the

Office of Inspection and Enforcement, consultants, and the Region II Office.

l The team concentrated its inspection on (1) the overall DBVP plan and scope;

(2) the implementing procedures for both the project and the associated

independent Engineerin (3) conduct and results of

j the walkdowns; and (4)g Assuranceassessment

a preliminary (EA) oversight;

of the preparation of design

criteria.

I

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 DBVP

plan, subject to the items contained in the enclosed inspection report. These

items were provided to TVA in an exit meeting on June 20, 1986. We expect these

~

f tems will be addressed in your ongoing DBVP. We intend to review your actions

>

in response to these items in future inspections.

~

The following summarizes the major concerns identified by the inspection team

with respect to the DBVP.

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(1) Several weaknesses in implementation of the DBVP were pointed out to TVA.

Examples include:

Inconsistencies between Units' I and 2 walkdowns, stemming from

excessive latitude given to syst+ms engineers on attributes to be

included.

Lack of verification of portions of system drawings where t portions of

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the system appeared on more than one drawing.

, Failure to document decisions regarding walkdown limits being

less inclusive than program boundaries.

2

' 8609170325 860915

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Mr. S. 'A. White -2-

(2) The scope of the walkdowns does not include physical verification of

instrumentation and electrical aspects, such as conformance of system

functionality to single-line diagrams, cable separation, etc. TVA intends to

assess the adequacy of these aspects by review of test or surveillance

documentation or other controlled documentation which is available. The

rationale to support TVA's position needs to be documented.

(3) TVA is developing procedures and criteria as the program progresses, which

may result in accommodation of the procedures to the actual work performed.

(4) The Engineering Assurance (EA) group's review of the DBVP lacks guidance in

determining which review products should be sampled. The EA review should

be focused towards (1) dominant safety systems, (2) complex Engineering

Change Notices (ECNs), and (3) areas where there is a known history of

industry problems.

TVA has decided' that the scope of the DBVP required to be completed prior to

restart will include those systems, or portions of systems, needed to mitigate

those accidents described in FSAR Chapter 15 or needed to achieve safe shutdown.

Although the team identified several specific comments relating to the program's

scope, the adequacy-of the program's scope is still undergoing staff review.

This letter also documents (report attachment B) several meetings which were

held prior to the inspection during which TVA discussed the DBVP in general

and information necessary for inspection planning was obtained.

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,

J es M. Tay1 , D rector

ffice of In ection and Enforcement

Enclosure:

Inspection Report 50-327/86-38 and 50-328/86-38

cc w/ enclosure: See next page

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Mr. S. A. White -

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Cc:

Herbert S. Sanger, Jr. , Esq. Tennessee Department of Public Health

General Counsel ATTN: Director, Bureau of Environmental

Tennessee Valley Authority Health Services

400 West Summit Hill Drive, E 118 33 Cordell Hull Building

Knoxville, TN 37902 Nashville, TN 37219

Mr. K. W. Whitt Mr. Michael H. Mobley, Director

' Tennessee Valley Authority Division of Radiological Health

400 West Summit Hill Drive, E3A8 T.E.R.R.A. Building

Knoxville,'TN 37902 150 9th Avenue North

Nashville, TN 37203

Mr. Bob Faas

Westinghouse Electric Corp. County Judge

P.O.. Box 355 Hamilton County Courthouse

Pittsburgh, PA 15230 Chattanooga, TN 37402

Mr. Jerry Wills

Tennessee, Valley Authority

SN 133 Lookout Place

'

Chattenooga, TN 37402-2801

,

Mr. Donald L. Williams, Jr.

Tennessee Valley Authority

400 West Summit Hill Drive, W10885

,

Knoxville,.TN 37902

Resident Inspector /Sequoyah NPS

c/o U.S. Nuclear' Regulatory Commission

2600 Igou Ferry Road

Soddy Daisy,.TN 37379

Regiorial Administrator, Region II

U.S. Nuclear Regulatory Commission

101 Marietta Street, N.W., Suite 2900

Atlanta, GA 30323

'

Mr. Everett Whitaker

Tennessee Valley Authority

SN 1288 Lookout Place

Chattanooga, TN 37402-2801

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Mr. S. A. Whit:J -4-

Distribution:

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GZech, RII

BBHayes, 0I

SPWeiss, RII

SRConnelly, 0IA

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JYoungblood, NRR

HThompson, NRR

DMuller, NRR

Inspection Team (8)

ABelisle, RII

JHolonich, NRR

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TMNovak, NRR

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HRDenton, NRR

GZech, RII

BBHayes, 0I

SPWeiss, RII

SRConnelly, 0IA

ELJordan, IE

JYoungblood, NRR

HThompson, NRR

DMuller, NRR

Inspection Team (8) -

ABelisle, RII

JHolonich, NRR

Resident Inspector

NSIC

Regional Administrator, II

CRStable, NRR

TMNovak, NRR

NTIS

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