ML17325B607
| ML17325B607 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 05/26/1999 |
| From: | Grobe J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Powers R AMERICAN ELECTRIC POWER CO., INC. |
| Shared Package | |
| ML17325B608 | List: |
| References | |
| 50-315-99-11, 50-316-99-11, NUDOCS 9906020114 | |
| Download: ML17325B607 (5) | |
See also: IR 05000315/1999011
Text
CATEGORY 2
REGULATORY INFORMATION DISTRIBUTION SYSTEM
(RXDS)
ACCESSXON NBR:9906020114
DOC.DATE: 99/05/26
NOTARIZED: NO
DOCKET
FACIL:50-315 Donald C.
Cook Nuclear Power Plant, Unit 1, Indiana
M
Q50Q0315
50-316 Donald C.
Cook Nuclear Power Plant, Unit 2, Indiana
M
05000316
AUTH.NAME
AUTHOR AFFILIATION
GROBE,J.A.
Region
3
(Post
820201)
RECZP.NAME
RECIPXENT AFFILIATION
POWERSFR.P.
American Electric Power Co., Inc.
SUBJECT: Forwards insp repts
50-315/99-11
6c 50-316/99-11
on 990426-
30.No violations noted. Circumstances
surrounding
two
electrical faults associated
with motor control centers
2-AN-B & 12-TSC-S which occurred
on 990419
S
24 reviewed.
DISTRIBUTION CODE: IEOIF
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15
ENCL
15
1y,
Hay 26,
1999
Mr. R. P. Powers
Senior Vice President
Nuclear Generation Group
American Electric Power Company
500 Circle Drive
Buchanan, Ml 49107-1395
SUBJECT:
NRC INSPECTION REPORT 50-315/99011(DRS); 50-316/99011(DRS)
Dear Mr. Powers:
On April30, 1999,.the NRC completed a special inspection at your D. C. Cook facility. The
enclosed report presents the results of that inspection.
The purpose of the inspection was to review the circumstances surrounding two electrical faults
associated with motor control centers 2-AM-8 and 12-TSC-S which occurred on April 19, and
April 24, 1999, respectively.
To evaluate the engineering implications associated
with these
events, the inspector focused on the licensee's root cause investigation of the failures, the
operability of the electrical distribution systems required to support the current cold shutdown
plant condition, and the licensee's engineering-related
corrective actions.
Following a review of these events, the NRC determined that the root cause investigations for
the electrical faults were promptly initiated. The findings indicated that a contributing cause for
the electrical fault in motor control center 2-AM-Bwas excessive dirt and dust in the breaker
cubicle due to inadequate cleaning; and that the electrical fault in motor control center 12-TSC-S
was caused by a random age-related failure of the control power transformer.
In addition, the NRC concluded that planned long-term corrective actions to address the motor
control center failures, which included extensive breaker refurbishments and motor control
center cleaning activities prior to plant restart, were thorough and comprehensive.
However, the
NRC identified a number of nonsafety-related
breakers important for the current plant condition
which had not been prioritized for refurbishment and cleaning.
Finally, since the simultaneous failure of circuit breakers due to faults in redundant divisions was
remote, and previous surveillance testing results were acceptable,
the NRC concluded that
there was reasonable
assurance
that the electrical distribution systems required for cold
shutdown plant operation were capable of performing their function.
'P'706020ii4
9'70526
ADOCK 050003i5
8
R. Powers
-2-
In accordance with 10 CFR 2.790 of the NRC's "Rules of Practice," a copy of this letter and its
enclosure willbe placed in the NRC Public Document Room.
Sincerely,
Docket Nos. 50-315; 50-316
Original /s/ J.
A. Grobe
John A. Grobe, Director
Division of Reactor Safety
Enclosure:
cc w/encl:
Inspection Report 50-315/99011(DRS);
50-316/99011(DRS)
A. C. Bakken III, Site Vice President
M. Rencheck, Vice President, Nuclear Engineering
D. Cooper, Plant Manager
R. Whale, Michigan Public Service Commission
Michigan Department of Environmental Quality
Emergency Management
Division
Ml Department of State Police
D. Lochbaum, Union of Concerned Scientists
Distribution:
RRB1 (E-Mail)
RPC (E-Mail)
Project Mgr., NRR w/encl
J. Caldwell, Rill w/encl
B. Clayton, Rill w/encl
SRI D.C. Cook w/encl
DRP w/encl
DRS w/encl
Rill PRR w/encl
PUBLIC IE-01 w/encl
Docket File w/encl
GREENS
IEO (E-Mail)
DOCDESK (E-Mail)
DOCUMENT NAME: G:ADRS>DCC99011.WPD
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