ML20206B817

Forwards Insp Rept 50-346/99-05 on 990405-09.No Violations Noted.Purpose of Insp Was to Examine on-line Maint Risk Assessment Program Recently Implemented in Response to Maint Work Control Weaknesses

ML20206B817
Person / Time
Site:	Davis Besse
Issue date:	04/27/1999
From:	Reynolds S NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
To:	Campbell G CENTERIOR ENERGY
Shared Package
ML20206B820	List: IR 05000346/1999005 ML20206B817
References
50-346-99-05, 50-346-99-5, NUDOCS 9904300090
Download: ML20206B817 (2)

See also: IR 05000346/1999005

Text

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April 27, 1999

Mr. Guy G. Campbell '

Vice President- Nuclear

Davis-Besse Nuclear Power Station

Centerior Service Company

5501 North State Route 2

Oak Harbor, OH 43449

SUBJECT: DAVIS-BESSE INSPECTION REPORT 50-346/99005(DRS)

Dear Mr. Campbell;

i

On April 9,1999, the NRC completed a routine on-line maintenance risk assessment

inspection at your Davis-Besse Nuclear Power Station. The enclosed report summarizes the

inspection results.

In November 1998, Davis-Besse experienced a manual reactor trip that was due, in part, to

authorized maintenance activities on components associated with a protected train during

plant operation. As a result of that reactor trip, we questioned the effectiveness of your work

control processes and the risk maintenance matrix that you used when evaluating and

approving on-line maintenance work activities. The purpose of this inspection was to examine

your on-line maintenance risk assessment program recently implemented in response to some

of these maintenance work control weaknesses. The inspection also evaluated risk

assessments performed to support engineering issues, such as, performing system outages

- during a plant shutdown versus on-line, temporary modifications; and planned outages. ,

Although still in the initial implementation stages, the new on-line maintenance risk program

was a significant improvement from wb-0 the plant had used in the past and appeared to be

working well. The process had the necessary steps to demonstrate that emergent activities

were adequately planned and controlled to avoid causing initiating events to occur or affect the

functional capability of mitigating systems. In particular, we noted risk assessments that were

thorough, of good quality, and resulted in keeping the plant's aggregate risk at a minimum.

The risk categorization of surveillance tests and increasing the initiating evert frequencies to ;

account for surveillance testing in your analyses were considered strengths. No violations of i

NRC requirements were identified during this inspection.

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9904300090 990427 "

gDR ADOCK 05000346 I

PDR y

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G. Campbell -2-

In accordance with 10 CFR 2.760 of the WRC's " Rules of Practice," a copy of this letter and its

enclosure will be placed in the NRC Public Document Room.

.

Sincerely,

Original /s/ S. Reynolds

Steven A. Reynolds, Deputy Director

Division of Reactor Safety

Docket No. 50-346

License No. NPF-3

Enclosure: Inspection Report 50-346/99005(DRS)

cc w/ encl: J. Stetz, Senior Vice President - Nuclear

J. Lash, Plant Manager

J. Freels, Manager, Regulatory Affairs

M. O'Reilly, FirstEnergy

State Liaison Officer, State of Ohio

R. Owen, Ohio Department of Health

C. Glazer, Chairman, Ohio Public

Utilities Commission

Distribution:

RPC (E-Mail)

Project Mgr., NRR w/enci

J. Caldwell, Rill w/enci

B. Clayton, Rlil w/ enc!

SRI Davis-Besse w/enci

DRP w/enci /)

DRS w/enci - /

Rlli PRR w/enci /

PUBLIC IE-01 w/ encl

Docket File w/enci '

GREENS

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DATE 04/r2/99 04hf/99 04/z799

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