ML20046A243
| ML20046A243 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 07/21/1993 |
| From: | Martin T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Schnell D UNION ELECTRIC CO. |
| Shared Package | |
| ML20046A244 | List: |
| References | |
| NUDOCS 9307270137 | |
| Download: ML20046A243 (3) | |
See also: IR 05000483/1993009
Text
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UNITED STATES
NUCLEAR REGULATORY COMMISSION
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JUL 211993
Docket No. 50-483
Union Electric Company
ATTN: Mr. Donald F. Schnell
Senior Vice President
Nuclear
Post Office Box 149-Mail Code 400
St. Louis, M0 63166
Dear Mr. Schnell:
This refers to the special electrical distribution system functional
inspection (EDSFI) conducted by Mrs. Sonia D. Burgess and others of this
office on June 14 through July 2,1993. The inspection evaluated activities
at Callaway Nuclear Power Plant authorized by NRC Operating License No.
NPF-30. We discussed our inspection findings with Mr. W. Campbell and members
of your staff at the exit interview on July 2,1993.
Areas examined during the inspection are identified in the report. The team
assessed the design, implementation, and engineering technical support
relative to the electrical distribution system (EDS).
The inspection
consisted of a selective review of design calculations, relevant procedures,
representative records, installed equipment, and interviews with engineering
and technical support staff.
The purpose of the inspection was to determine
whether activities authorized by the license were conducted safely and in
accordance with NRC requirements. This inspection was abbreviated due to a
previous EDSFI at a similar Standardized Nuclear Unit Power Plant System
(SNUPPS) plant, and concentrated on features unique to Callaway.
The team concluded that Callaway's electrical distribution system was
designed, operated, and maintained in an effective manner and engineering and
technical support was good. However, the team identified several weaknesses.
Most significant were the lack of an analysis to justify the degraded voltage
bistable reset value, an emergency diesel generator low resistance neutral
grounding scheme that would not provide opti,1um ground fault protection, and a
battery ground detection system that could compromise the advantages of an
ungrounded system.
Several strengths were also identified. Most significant was the engineering
staff's. knowledge and experience levels and the minimal reliance on architect
engineering support.
The EDS and related support equipment materiel condition
was good and your internal Electrical Distribution System Functional
Assessment (EDSFA) was thorough in identifying weaknesses and deficiencies in
the EDS.
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Union Electric Company
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JUL 211993
No violations of NRC requirements were identified during the course of this
inspection.
In accordance with 10 CFR 2.790 of the Commission's regulations, a copy of
this letter and the enclosed inspection report will be placed in the NRC
Public Document Room.
We will gladly discuss any questions you have concerning'this inspection.
Sincerely,
,
"
T. O. Martin, Acting Director
Division of Reactor Safety
-
Enclosures:
1.
Inspection Report No.
50-483/93009(DRS)
2.
Appendix A - Personnel
Contacted
,
3.
Appendix B - Requests
for Information
See Attached Distribution
.
..
Union Electric Company
3
JU
211993
Distribution
cc w/ enclosures:
G. L. Randolph, Vice President,
Nuclear Operations
J. V. Laux, Manager, Quality
Assurance
S. E. Sampson, Supervising
Engineer, Site Licensing
OC/LFDCB
Licensing Project Manager, NRR
E. Imbro, NRR
Resident Inspector, RIII
Region IV
Resident Inspector, Wolf Creek
-
K. Drey
C. John Renken, Engineer,
Policy & Federal Dept.
Gerald Charnoff, Esq.
R. A. Kucera, Deputy Director,
Department of Natural Resources
Dr. J. O. Cermac
Chairman, Illinois Commerce
Commission
M. W. Hodges, RI
A. F. Gibson, RII
S. J. Collins, RIV
K. E. Perkins, RV
..
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