ML16148A512
| ML16148A512 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 05/15/1991 |
| From: | Reyes L NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Tuckman M DUKE POWER CO. |
| References | |
| EA-91-049, EA-91-49, NUDOCS 9105210229 | |
| Download: ML16148A512 (18) | |
See also: IR 05000269/1991008
Text
MAY 15 1991
Docket Nos. 50-269, 50-270,.50-287
License Nos. DPR-38, DPR-47, DPR-55
EA 91- 049
Duke Power Company
ATTN:
Mr. M. S. Tuckman, Vice President
Nuclear Operations
P. 0. Box 1007
Charlotte, NC 28201-1007
Gentlemen:
SUBJECT:
ENFORCEMENT CONFERENCE SUMMARY
NRC INSPECTION REPORT NOS. 50-269/91-08, 50-270/91-08 AND
50-287/91-08
This letter refers to the Enforcement Conference held at our request on May 7,
1991.
This meeting concerned activities authorized for your Oconee facility.
The issues discussed at this conference related to the March 8, 1991, event at
Oconee in which decay heat removal capability and reactor coolant inventory
were temporarily lost for Unit 3 while this unit was in a cold shutdown
condition. A list of attendees, a summary, and a copy of your handouts are
enclosed.
We are continuing our review of these issues to determine the
appropriate enforcement action.
In accordance with Section 2.790 of the NRC's "Rules of Practice," Part 2,
Title 10, Code of Federal Regulations, a copy of this. letter and its enclosures
will be placed in the'NRC Public Document Room.
Should you have any questions concerning this matter, please contact us.
Sincerely,
Original Signed by
Luis A. Reyes
Luis A. Reyes, Director
Division of Reactor Projects
Enclosures:
1. List of Attendees
2. Enforcement Conference Summary
3. Enforcement Conference Handout
cc w/encls:
H. B. Barron
Station Manager
Oconee Nuclear Station
P. 0. Box 1439
Seneca, SC 29679
(cc w/encls cont'd -
see page 2)
9105210229 910515
ADOCK 05000269
Q
Duke Power Company
2
MAY 15 1991
cc w/encls:
(Continued)
A. V. Carr, Esq
Duke Power Company
422 South Church Street
Charlotte, NC 28242-0001
County Supervisor of Oconee County
Walhalla, SC 29621
Robert B. Borsum
Babcock and Wilcox Company
Nuclear Power Generation Division
Suite 525, 1700 Rockville Pike
Rockville, MD 20852
J. Michael McGarry, III, Esq.
Bishop, Cook, Purcell and. Reynolds
1400 L Street, NW
Washington, D. C. -20005
Office of Intergovernmental Relations
116 West Jones Street
Raleigh, NC 27603
Heyward G. Shealy, Chief
Bureau of Radiological Health
South Carolina Department of Health
and Environmental Control
2600 Bull Street
Columbia, SC 29201
Manager, LIS
NUS Corporation
2650 McCormick Drive
Clearwater, FL
34619-1035
Stephen Benesole
Duke Power Company
P. 0. Box 1007
Charlotte, NC 28201-1007
R. L. Gill
Nuclear Production Department
Duke Power Company
P. 0. Box 1007
Charlotte, NC 28201-1007
Karen E. Long
Assistant Attorney General
N. C. Department of Justice
P. 0. Box 629
Raleigh, NC
27602
(cc w/encls cont'd -
see page 3)
Duke Power Company
3
MAY 15 1991
cc w/encls:
(Continued)
H. B. Tucker
Senior Vice President-Nuclear
Duke Power Company
P. 0. Box 1007
Charlotte, NC 28201-1007
bcc w/encls:
L. Wiens, NRR
W. H. Miller, RII
G. A. Belisle, RH
A. R. Herdt, RII
Document Control Desk
NRC Resident Inspector
U.S. Nuclear Regulatory Commission
Route 2, Box 610
Seneca, SC 29678
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ENCLOSURE 1
LIST OF ATTENDEES
Duke Power Company
M. S. Tuckman, Vice President, Nuclear Operations
H. B. Barron, Station Manager, Oconee Nuclear Station (ONS)
R. L. Swiegart, Superintendent of Operations, ONS
0. C. Kohler, Licensing Coordinator, ONS
Nuclear Regulatory Commission
J. L. Milhoan, Deputy Regional Administrator, Region II (RII)
L. A. Reyes, Director, Division of Reactor Projects (DRP), RII
G. R. Jenkins, Director, Enforcement and Investigations Coordination
Staff (EICS), RII
B. Uryc, Senior Enforcement Coordinator, EICS, RH
A. R. Herdt, Chief, Reactor Projects Branch 3, DRP, RII
T. A. Peebles, Chief, Operations Branch, Division of Reactor Safety (DRS), Ru
G. A. Belisle, Chief, Reactor Projects Section 3A, DRP, RII
P. H. Skinner, Chief, Reactor Projects Section 3B, DRP, RH
S. Q. Ninh, Project Engineer, DRP, RII
W. H. Miller, .Project Engineer, DRP, RII.
W. M. Troskoski, Enforcement Coordinator, Office of Enforcement
T. A. Reed, Project Manager, Nuclear Reactor Regulation
F. Jape, Chief, Test Program Section, DRS, RH
ENCLOSURE 2
ENFORCEMENT CONFERENCE SUMMARY
On May 7, 1991, representatives from Duke Power Company (DPC) met with the NRC
in the Region II office in Atlanta, Georgia to discuss issues associated with
the March 8, 1991, event at Oconee in which decay heat removal capability and
reactor coolant inventory were temporarily lost for Unit 3 while this unit was
in a cold shutdown condition.
Following opening remarks by Mr. J. L. Milhoan, Deputy Regional Administrator,
Region II (RII),
Mr. L. A. Reyes, Director Division of Reactor Projects, RH,
and Mr. W. M. Troskoski, NRC Enforcement Coordinator, DPC gave a presentation
(Enclosure 3) on the issues.
An introduction to DPC's presentation was given by Mr. M. S. Tuckman, Vice
President,
Nuclear Production,
with the formal
presentation given by
Mr. H. B. Barron, Oconee Station Manager. The items associated with this event
which were discussed included:
description of the high pressure injection
system; work sequence and operational activities prior to the event; safety
significance; identified deficiencies and corrective actions implemented;
radiation monitor modification program;
and,
shutdown
risk management
practices in effect at Oconee and other DPC nuclear sites.
NRC closed the meeting by thanking DPC for their presentation and stating that
the presentation had served to enhance the NRC's understanding of the issues.
ENCLOSURE 3
LOSS OF SHUTDOWN COOLING
OCONEE NUCLEAR STATION
MARCH 8, 1991
OPENING REMARKS
EVENT REVIEW
SAFETY SIGNIFICANCE
CORRECTIVE ACTIONS
SHUTDOWN RISK MANAGEMENT
EVENT INVESTIGATION PROCESS
CLOSING REMARKS
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To either
LP19 or LP20
(Typical of two Lines)
3LP-19 WORK SEQUENCE
INSTALL FLANGE
- LEAK TEST PENETRATION
REMOVE MOTOR ACTUATOR
- PM VALVE REPACK (DEFUEL REQUIRED)
REPLACE MOTOR ACTUATOR
ADJUST LIMITS
VALVE ACTUATOR DIAGNOSTICS (MOVATS)
- VALVE STROKE TIMING
REMOVE FLANGE
SEQUENCE OF EVENTS
2/22/91
FLANGE INSTALLED ON PIPING TO 3LP-20
RATHER THAN 3LP-19
2/23/91
LEAK TEST PROCEDURE OF PENETRATION
2/25/91 PERFORMED
2/25/91
3LP-19 REPACKED AND MOTOR
3/5/91
RECONNECTED
3/8/91
3LP-19 RELEASED TO TECHNICIANS TO
07:30
ADJUST LIMITS, VESSEL LEVEL IS 76"
3/8/91
TECHNICIAN BEGINS MANUALLY OPENING
08:48
LEVEL
ALARMS
RECEIVED
IN
CONTROL ROOM
3/8/91
ABNORMAL PROCEDURE FOR LOSS OF
08:52
SHUTDOWN
COOLING
ENTERED,
OPERATING LPI PUMP STOPPED DUE TO
ABNORMAL MOTOR CURRENT
3/8/91
GRAVITY MAKEUP ATTEMPTED PER
08:56
PROCEDURE
3/8/91
3LP-19 RECLOSED
09:00
3/8/91
GRAVITY MAKEUP REINITIATED
09:02
3/8/91
LEVEL IS RESTORED TO 76"
09:05
3/8/91
3A LPI PUMP IS VENTED
09:09
3/8/91
3A LPI PUMP IS RESTARTED, FORCED
09:11
COOLING IS RE-ESTABLISHED
SAFETY SIGNIFICANCE
OPERATORS RESPONDED QUICKLY AND
DECISIVELY, EFFECTIVELY UTILIZING
PROCEDURES AND TRAINING TO RECOVER
COOLANT INVENTORY
MULTIPLE OPTIONS FOR CORE COOLING
WITHOUT CORE UNCOVERY WERE AVAILABLE
CONTAINMENT EQUIPMENT HATCH AND
PERSONNEL HATCH WERE CLOSED
NO SIGNIFICANT RADIOLOGICAL DOSE RECEIVED
NO RELEASE OF RADIOACTIVITY OCCURRED
DEFICIENCIES AND CORRECTIVE ACTIONS
FLANGE INSTALLATION PROCEDURE DEFICIENCY
IDENTIFY AND PROVIDE ENHANCED
PROCEDURES/WORK DIRECTION FOR ROUTINE
FLANGE INSTALLATIONS DURING SHUTDOWNS
REVISE TEST PROCEDURES ASSOCIATED WITH
LP-19 AND LP-20 TO SPECIFY AND FACILITATE
INDEPENDENT VERIFICATION OF FLANGE
LABELING DEFICIENCIES
CLEARLY COMMUNICATE TO ALL PERSONNEL
ACTIONS TO BE TAKEN UPON IDENTIFYING A
LABELING DISCREPANCY
COMMUNICATIONS DEFICIENCIES
RE-ENFORCE EXPECTATION FOR THE USE OF
REPEAT BACK PRACTICES DURING ALL
COMMUNICATIONS WITH CONTROL ROOM
PERSONNEL
CORRECTIVE ACTIONS
(CONTINUED)
REACTOR COOLANT BOUNDARY CONTROL
IDENTIFY AND SECURE INTER-SYSTEM
BOUNDRIES TO THE EXTENDED RCS DURING
DRAINDOWN CONDITIONS
IMPLEMENT ENHANCED ADMINISTRATIVE
CONTROLS TO GOVERN ANY CHANGES IN THE
EXTENDED BOUNDRY
RADIATION MONITOR MODIFICATIONS
CONSIDERATIONS
AIR MONITORS (GAS, IODINE, PARTICULATE)
ARE INTERDEPENDENT (COMMON SKID)
AREA MONITORS IN RB ARE INTERDEPENDENT
(COMMON WIRING IN C/R)
AREA MONITORS IN FUEL CANAL AREA WERE
BEING REPLACED DUE TO UNRELIABILITY
0
RADIATION MONITORING
COMPENSATORY MEASURES TAKEN
AIR SAMPLERS AT EACH ELEVATION
AND IN EACH CAVITY
REMOVED AND READ EACH 4-6 HOURS
CONTINUOUS AIR MONITOR
WITH LOCAL ALARM
IN THE FUEL CANAL AREA
CREWS WORKING IN THE CANAL AREA
EQUIPPED WITH ALARMING DOSE METERS
CONTINUOUS RP TECHNICIAN SUPPORT WITH
PORTABLE SURVEY INSTRUMENTS FOR ANY
WORKERS IN THE FUEL CANAL AREA
SHUTDOWN RISK MANAGEMENT
PRACTICES AT OCONEE
ALL REQUIREMENTS FROM GL 88-17 ARE APPLIED
WHEN LEVEL LOWER THAN 3 FEET BELOW VESSEL
FLANGE (REDUCED INVENTORY)
UPPER S/G HANDHOLE COVERS REMOVED FOR
EACH DRAINDOWN TO ASSURE VENT PATH,
GRAVITY MAKEUP ASSURED
TIME IN REDUCED INVENTORY STRICTLY
MINIMIZED (2.5 DAYS LAST OUTAGE)
MULTIPLE POWER SOURCES TO BOTH THE
SAFETY BUSSES AND NON-SAFETY BUSSES DURING
REDUCED INVENTORY OPERATIONS
SHUTDOWN RISK MANAGEMENT
MULTIPLE DHR TRAINS AND SERVICE WATER
SOURCES ARE AVAILABLE
IMPROVED RCS BOUNDARY CONFIGURATION
CONTROL WILL REDUCE RISK OF LOSS OF
INVENTORY
SSF ASSURES SOURCE OF S/G FEEDWATER
INDEPENDENT FROM NORMAL AND EMERGENCY
FEEDWATER SYSTEMS
ONE PERSONNEL AIR LOCK DOOR CLOSED
AT MOST TIMES
PORTABLE GENERATOR, ELECTRIC WRENCHES
AVAILABLE TO CLOSE EQUIPMENT HATCH