ML20198A074

Forwards Insp Rept 50-483/98-18 on 980914-1002 & Notice of Violation.Two Violations Identified Relative to Maintaining Sound Design Basis for Electrical Distribution Sys & Operating within Assumptions of Licensee Design

ML20198A074
Person / Time
Site:	Callaway
Issue date:	12/04/1998
From:	Stetka T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
To:	Randolph G UNION ELECTRIC CO.
Shared Package
ML20198A079	List: IR 05000483/1998018 ML20198A074 ML20198A123
References
50-483-98-18, NUDOCS 9812160149
Download: ML20198A074 (5)

See also: IR 05000483/1998018

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UNITED STATES

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December 4, 1998

Garry L. Randolph, Vice President and

Chief Nuclear Officer

Union Electric Company

- P.O. Box 620

Fulton, Missouri 65251

SUBJECT: NRC INSPECTION REPORT 50-483/98-18 AND NOTICE OF VIOLATION

Dear Mr. Randolph:

From Sept 7mber 14 through October 2,1998, a safety system engineering inspection and

inspection of your program to implement 10 CFR 50.59, " Changes, Tests and Experiments,"

wre conducted at your Callaway Plant reactor facility. Following the exit meeting, the results of

these inspections were discussed with Mr. Mark Reidmeyer of your staff. The enclosed report

presents the scope and results of these inspections.

The safety system engineering inspection included an assessment of the capability of the

essential service water system and supporting electrical systems. On the basis of the results of

our completed reviews, we concluded that the essential service water was capable of

performing its safety functions. We also concluded that your engineering program continued to

be good, although two violations were identified relative to maintaining a sound design basis for

your electrical distribution system and operating within the assumptions of your design, The

NRC has concluded that information regarding the reasons for the violations, the cocrective

actions taken and planned to correct the violations and prevent recurrence is already

adequately addressed on the docket in the enclosed report. Therefore, you are not required to

respond to this letter unless the description therein does not accurately reflect your corrective

actions or your position. In that case, or if you choose to provide additionalinformation, you

should follow the instructions specified in the enclosed Notice.

One unresolved item was also identified concerning design changes made to bypass torque

switches, originally installed in safety-related motor-operated valve control circuits to prevent

overtorque, during valve closure. This matter is discussed in Section E1.1.1 of the enclosed

inspection report. We are concerned that your weak link analysis was not performed with the

maximum expected voltage, and as a result, you may not have identified pressure boundary

parts that could be damaged. We are also concerned that you may not have fully evaluated

valves that had safety functions in both the closing and opening direction, particularly those that

are located in high temperature locations during accident conditions. As discussed, during the

exit, we understand that you have committed to perform additional review to confirm the

adequacy of your design in this area.

Appropriate procedural guidance was in place to implement the requirements of 10 CFR 50.59

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and the safety evaluations that were reviewed properly docurnented that no unreviewed safety

questions existed.

9812160149 981204

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PDR

ADOCK 05000483

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PDR

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Union Electric Company

-2-

In accordance with 10 CFR 2.790 of the NRC's " Rules of Practice," a copy of this letter, its

enclosure (s), and your response will be placed in the NRC Public Document Room (PDR).

Should you have any questions concerning this inspection, we will be pleased to discuss them

with you.

Sincerely,

/

M

Thomas F. Stetka

Acting Chief, Engineering Branch

Division of Reactor Safety

Docket No.:

50-483

License No.: NPF-30

Enclosures:

1. Notice of Violation

2. NRC Inspection Report

50-483/98-18

cc w/ enclosures:

Professional Nuclear Consulting, Inc.

19041 Raines Drive

Derwood, Maryland 20855

John O'Neill, Esq.

Shaw, Pittman, Potts & Trowbridge

2300 N. Street, N.W.

Washington, D.C. 20037

H. D. Bono, Supervising Engineer

Quality Assurance Regulatory Support

Union Electric Company

P.O. Box 620

Fulton, Missouri 65251

Manager - Electric Department

Missouri Public Service Commission

301 W. High

P.O. Box 360

Jefferson City, Missouri 65102

Ronald A. Kucera, Deputy Director

Department of Natural Resources

P.O. Box 176

Jefferson City, Missoun 65102

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Union Electric Company

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Otto L. Maynard, President and

Chief Executive Officer

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Wolf Creek Nuclear Operating Corporation

P.O. Box 411

Burlington, Kansas 66839

Dan 1. Bolef, President

Kay Drey, Representative

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Board of Directors Coalition

for the Environment

6267 Delmar Boulevard

Univetsity City, Missouri 63130

Lee Fritz, Presiding Commissioner

Callaway County Court House

10 East Fifth Street

Fulton, Missouri 65151

Alan C. Passwater, Manager

Licensing and Fuels

AmerenUE

One Ameren Plaza

1901 Chouteau Avenue

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P.O. Box 66149

St. Louis, Missouri 63166-6149

J. V. Laux, Manager

Quality Assurance

LUnion Electric Company

P.O. Box 620

Fulton, Missouri 65251 -

Jerry Uhlmann, Director

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State Emergency Management Agency

P.O. Box 116

Jefferson City, Missouri 65101

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