ML15118A212
| ML15118A212 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 05/30/1997 |
| From: | Reyes L NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Hampton J DUKE POWER CO. |
| Shared Package | |
| ML15118A213 | List: |
| References | |
| 50-269-97-06, 50-269-97-6, 50-270-97-06, 50-270-97-6, 50-287-97-06, 50-287-97-6, FACA, NUDOCS 9706090180 | |
| Download: ML15118A212 (6) | |
See also: IR 05000269/1997006
Text
CATEGORY 2'
REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)
ESSION NBR:9706090180
DOC.DATE: 97/05/30
NOTARIZED: NO
DOCKET #
FACIL:50-269 Oconee Nuclear Station, Unit 1, Duke Power Co.
05000269
50-270 Oconee Nuclear Station, ,Unit 2, Duke Power Co.
05000270
50-287 Oconee Nuclear Station, Unit 3, Duke Power Co.
.05000287
TH.NAME
AUTHOR AFFILIATION
YES,L.A.
Region 2 (Post 820201)
RECIP.NAME
RECIPIENT AFFILIATION
HAMPTONJ.W.
Duke Power Co.
SUBJECT: Forwards AIT insp repts 50-269/97-06,50-270/97-06 &
c
50-287/97-06 on 970503-09.
DISTRIBUTION CODE: IE10F COPIES RECEIVED:LTR
/ENCL
I SIZE:
A
TITLE: 50 Dkt Augmented Inspection Team (AIT) Reports/Correspondence
T
NOTES:
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RECIPIENT
COPIES
RECIPIENT
COPIES
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ID CODE/NAME
LTTR ENCL
ID CODE/NAME
LTTR ENCL
PD2-2 PD
1
1
LABARGE,D
1
1
0
INTERNAL: ACRS
1
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1
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1
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1
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NRR/DRPW
1
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2
NRR/DSSA/DIR
1
1
NUDOCS-ABSTRACT
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OE/DIR
1
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FILE 01
1
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NRC PDR
1
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NUDOCS FULLTEXT
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LOADED FROM
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NOTE TO ALL "RIDS" RECIPIENTS:
PLEASE HELP US TO REDUCE WASTE! CONTACT THE DOCUMENT CONTROL DESK,
ROOM OWFN 5D-5(EXT. 415-2083) TO ELIMINATE YOUR.NAME FROM
DISTRIBUTION LISTS FOR DOCUMENTS YOU DON'T NEED!
TOTAL NUMBER OF COPIES REQUIRED: LTTR
28
ENCL
28
May 30, 1997
Duke Power Company
ATTN: Mr. J. W. Hampton
Vice President
Oconee Nuclear Station
P. 0. Box 1439
Seneca, SC 29679
SUBJECT:
NRC AUGMENTED TEAM INSPECTION REPORT 50-269/97-06,
50-270/97-06, 50-287/97-06
Dear Mr. Hampton:
This inspection report documents the Nuclear Regulatory Commission's (NRC) response to
an event that occurred at Oconee Nuclear Station (ONS), Unit 3, on May 3, 1997, resulting in
degradation of the high pressure injection system during unit cooldown. The NRC chartered
an Augmented Inspection Team (AIT) to evaluate the event and the ONS' response to it.
The AIT completed its onsite inspection on May 9, 1997.
The AIT conducted an independent inspection of the event and circumstances surrounding it,
monitored the licensee's investigations into the incident, and reviewed other related
.
data/events. The AIT concluded that the event causes included: (1) lack of redundancy in
design of the letdown storage tank level instrumentation system; and, (2) loss of reference
leg inventory resulting in non-conservative and non-responsive level indication for both
letdown storage tank level instruments. These causes resulted in ONS being operated
outside its design basis during the period that the level instrumentation error caused letdown
storage tank levels to be lower than allowed. With a low letdown storage tank level, the
ability of the high pressure injection system to perform its safety function of mitigating a
design basis accident was not assured.
Also, during the Unit 3 cooldown on May 3, 1997, operators did not properly perform the
fundamental activities of monitoring and balancing reactor coolant inventory, and therefore,
they did not question the non-responsive letdown storage tank level indication, resulting in
the letdown storage tank being emptied of water to the point that degradation occurred on
two of the three high pressure injection pumps.
In addition to the causes discussed above, the AIT determined the root cause of the event
was inappropriate use of plant and industry operating experience to assure that plant design,
maintenance, and operation were focused on reliable operation of the High Pressure Injection
System/Components involved in this event.
090035
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9706090180 970530
0 3 2
4
D
PDR ADOCK 05000269
G
2
.
The AIT found the licensee's response to the event after pump degradation occurred was
conservative, with the emergency plan being used to help staff and manage the high
pressure injection system recovery efforts in order to continue with the cooldown.
The AIT charter did not include the determination of compliance with NRC rules and
regulations or to recommend enforcement actions. These aspects will be addressed in a
subsequent inspection.
In accordance with 10 CFR 2.790 of the NRC's "Rules of Practice," a copy of this letter and
its enclosures will be placed in the NRC Public Document Room (PDR).
Should you have any questions regarding this letter, please contact us.
Sincerely,
ORIGINAL SIGNED BY:1
LUIS A. REYES
Luis A. Reyes
Regional Administrator
Docket Nos.: 50-269, 50-270, 50-287
License Nos.: DPR-38, DPR-47, DPR-55
Enclosure:
NRC Augmented Team Inspection
Report 50-269/97-06, 50-270/97-06,
50-287/97-06
cc w/encl:
Mr. J. E. Burchfield
Compliance
Duke Power Company
P. 0. Box 1439
Seneca, SC 29679
Mr. Paul R. Newton
Legal Department (PB05E)
Duke Power Company
422 South Church Street
Charlotte, NC 28242-0001
Mr. Robert P. Gruber
Executive Director
Public Staff - NCUC
0. Box 29520
Raleigh, NC 27626-0520
(cc w/encl cont'd - See page 3)
3
(cc w/encl cont'd)
Mr. Robert B. Borsum
Framatome Technologies
1700 Rockville Pike, Suite 525
Rockville, MD 20852
Mr. J. Michael McGarry, Ill, Esq.
Winston and Strawn
1400 L Street, NW
Washington, D. C. 20005
Mr. Dayne H. Brown, Director
Division of Radiation Protection
N. C. Department of Environmental
Health & Natural Resources
P. 0. Box 27687
Raleigh, NC 27611-7687
Mr. Max Batavia, Chief
Bureau of Radiological Health
South Carolina Department of Health
and Environmental Control
2600 Bull Street
Columbia, SC 29201
County Supervisor of
Oconee County
Walhalla, SC 29621
Manager, LIS
NUS Corporation
2650 McCormick Drive
Clearwater, FL 34619-1035
Mr. G. A. Copp
Licensing - EC050
Duke Power Company
P. 0. Box 1006
Charlotte, NC 28201-1006
Ms. Karen E. Long
Assistant Attomey General
N. C. Department of Justice
P. 0. Box 629
Raleigh, NC 27602
Distribution w/encl: (See page 4)
4
Distribution w/encl:
Chairman Jackson
Commissioner Rogers
Commissioner Dicus
Commissioner Diaz
Commissioner McGaffigan
J. Callan, EDO
E. Jordan, AEOD
P. Norry, DEDM
H. Thompson, DEDE
S. Collins, NRR
T. Kress, ACRS
K. Cyr, OGC
A. Chaffee, NRR/AEGB
C. Paperiello, NMSS
Docket Control Desk, IRM
J. Lieberman, OE
G. Tracy, OEDO
D. LaBarge, NRR
R. Carroll, RII
C. Casto, RII
N. Economos, RII
C. Payne, RII
D. Forbes, RIl
PUBLIC
NRC Resident Inspector
U.S. Nuclear Regulatory Commission
78128 Rochester Highway
Seneca, SC 29672
- SEE PREVIOUS CONCURRENCE
SEND TO PUBLIC DOCUMENT ROOM?
YES
NO
OFFICE
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DATE
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YES
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YES
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OFFIL RECURD CUPY
UOCUMEN
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Distribution w/encl:
Chairman S. A. Jackson
Commissioner Rogers
Commissioner Dicus
Commissioner Diaz
Commissioner McGaffigan
J. Callan, EDO
P.-Norry,
E. Jordan, AEOD
H. Thompson,
T. Kress, ACRS
F. Miraglia, NRR
K. Cyr, OGC
A. Chaffee, NRR/AEGB
C. Paperillo, NMSS
Docket Control Desk, IRM
J. Lieberman, OE
D. LaBarge, OE
R. Carroll, RII
C. Casto, RII
N. Economos, RII
.R.
Baldwin, RII
PUBLIC
NRC Resident Inspector
U.S. Nuclear Regulatory Commission
78128 Rochester Highway
Seneca, SC 29672
SEND TO PUBLIC DOCUMENT ROOM?
YES
NO
,
OFFICE
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SIGNATURE
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DATE
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NAME:
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