ML20055H410
| ML20055H410 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 07/18/1990 |
| From: | Reyes L NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Tucker H DUKE POWER CO. |
| References | |
| NUDOCS 9007260169 | |
| Download: ML20055H410 (23) | |
See also: IR 05000413/1990017
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Al.18-1990
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Docket Nos.- 50-413, 50-414--
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Duke Power Company
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ATTN: Mr. H. B. Tucker, Vice President
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Nuclear Production Department .
P. O. Box 1007
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Charlotte, NC- 28201-1007_.
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Gentlemen:
E
SUBJECT:
ENFORCEMENT CONFERENCE SUMMARY-
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(NRC INSPECTION REPORT NOS. 50-413/90-17AND50-414/90-17)1
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This letter refers to the Enforcement- Conference held at our request on-
3
July.12, 1990.
This meeting concerned. activities authorized for your Catawba :
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facility.
The issues discussed at this conference related to the Unit 1 event
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on June-11, 1990, involving inadvertent diversion of higher: pressure reactor -
coolant water to the Refueling Water Storage Tank.- A list of attendees ~.-'a-
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suninary, and a - copy of your handouts are enclosed. . We are continuing- our-
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review of these issues to determine the appropriate enforcementLaction..
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.
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Sincerely,
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Luis A. Reyes . Director
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Division of' Reactor Projects
Enclosures:
1 '. List of Attendees
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2.
Enforcement Conference' Summary
3.
Enforcement. Conference Handouts
-cc w/encls:
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.T. B. Owen, Station Manager
Catawba Nuclear Station
P. O. Box 256
4
Clover,.SC 29710
(cc w/encls cont'd - see page 2)
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9007260169 90071g
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{DR
ADOCK 05000413
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Duke Power Company
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. cc w/encls:' .(Cont' inued)
A. V. Carr, Esq.
Duke Power Company
P..O. Box 1007
Charlotte, NC 28201-1007
J. Michael McGarry, III,:Esq.
Bishop, Cook, Purcell and Reynolds
1400 L Street, NW .
Washington, D.
C._
20005
L)Q
North Carolina MPA-1
3100'Smoketree Ct., Suite 600
P. O. Box 29513-
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Raleigh 'NC 27626-0513
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Heyward G. Shealy, Chief
Bureau of Radiological Health
a
South Carolina' Department of Health
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and Environmental Control
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2600 Bull Street.
Columbia, SC 29201
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Richard P. Wilson Esq.
Assistant-Attorney General-
S. C. Attorney Ge'neral's Office-
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P. O. Box 11549
y
):
Columbia, SC: 29211
.
Michael.Hirsch
Federal Emergency Management Agency
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500 C Street, SW, Room 840-
Washington. D. C.
20472-
North Carolina Electric-
Membership Corporation
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3400 Sumner Boulevard
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P. O. Box 27306
Raleigh, NC27611
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Karen E. Long
Assistant Attorney General
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N. C. Department of-Justice
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P. 0. Box 629
Raleigh, NC 27602
Saluda River. Electric-
Cooperative, Inc.
P. O. Box 929
.Laurens, SC 29360
(cc w/encls cont'd - see page 3)
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Duke _Fower Company
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(Continued)
S. S..Kilborn, Area Manager
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Mid-South Area ESSD Projects-
-Westinghouse Electric Corporation
MNC West Tower
. Bay 239'
P. O. Box 335
.
Pittsburg, PA .15230
County Manager of York County-
'
York County Courthouse
->
York,'SC 29745
~ Piedmont Municipal 1 Power Agency
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121 Village-Drive
{
'Greer, SC -29651
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State of' South Carolina
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bec w/encls.
K. N. Jabbour, NRR
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B. R. Bonser, RII
M. B. Shymlock, RII
.A.-R. Herdt, RII
Document Control Desk
NRC Resident Inspector
U.S. Nuclear Regulatory Commission-
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Route 2, Box 179-N
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York..SC 29745
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J. Lieberman
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ENCLOSURE 1
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LIST OF ATTENDEES
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U.S. Nuclear Regulatory Commission
B. Breslau, Reactor Engineer
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L. A. Reyes, Director, Division of Reactor Projects
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E. W. Merschoff,~ Deputy Director, Division of Reactor Safety
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G. R. Jenkins, Director, Enforcement and Investigation Coordination ~ Staff
A.'R. Herdt,' Branch Chief, Division of. Reactor Projects
P. J. .Kellogg, Section Chief, DivisionLof Reactorf Safety
K. N. Jabbour, Project Manager 0ffice of Nuclear Reactor Regulation
W..T. Orders, Senior. Resident Inspector, Catawba
E. M. Kelly, Acting Section " Chief, Division uof Reactor Projects
D. B. Matthews, Assistant Director Projects .NRR
Duke Power Company
T. B. Owen, Station Manager, Catawba
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R. N. Casler,- Operations Superintendent,- Catawba
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A. S. Bhatnager,-Performance Engineer,. Catawba
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G. B. Swindlehurst, Design Engineer, Duke Power Company
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M. S. Tuckman, General Manager,. Duke Power Company
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A. Crisp, Reactor Operator, Duke Power Company '
14. Ravan, Shift Supervisor, Duke Potter Company
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P. R. Pappas, North Carolina Electric Membership Corporation'
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-ENCLOSlfRE 2
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ENFORCEMENT CONFERENCE SUMMARY
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On-July 12, 1990, representatives from Duke Power Company (DPC) met with the
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NRC in the Region II office in Atlanta, Georgia to discuss issues concerning
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the' June 11,'1990, residual; heat removal system design ands test ~ evolution,.
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operator response to the' event, root -cause, corrective action and safety
R
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significance of the event.
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Following opening remarks by Luis Reyes, Director, Division of Reactor Projects
(DRP)
DPC gave a presentation,(Enclosure 3) on the. issues.- T.; B. Owen, the
Catawba Station Manager. . introduced DPC'sL presentations.- . The presentation
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covered the sequence of events, system description, operator response, root
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cause and contributing causes, corrective actions, and the safety significance.-
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A. summary and concluding remarks were made by T
B.: 0 wen and M. S.:Tuckman.
The NRC closed the meeting by stating that. DPC's presentations had: served to
enhance Region II's understanding of the issues and DPC's corrective actions,
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ENCLOSURE-3-
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DUKE POWER COMPANY
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CATAWBA NUCLEAR STATION.
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ENFORCEMENTICONFERENCE
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JULY 12,1990
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AGENDA
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INTRODUCTION
TONY OWEN
SEQUENCE OF EVENTS
IRICH CASLER
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ROOT CAUSE
TONY OWEN
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CORRECTIVE ACTIONS
TONY OWEN
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SAFETY EVALUATION
opggg;SWINDLEMURST
SUMMARY
TONY OWEN
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PLANT STATUS PRIOR TO EVENT
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NC PRESSURE l335 PSIG
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'B' TRAIN RECIRC:TO FWST
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SEQUENCE OF EVENTSi
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'B' TRAIN:RHR CHECK VALVE TEST COMPLETION:
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FWST ISOLATED FROM;'B' TRAIN RHRi
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TWO OPERf TORS INSTRUCTED TO CLOSE ND-33
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STEP TO BE; COMPLETED:
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OPENED 'B' TRAIN RHR:ISOLATIONS TO
NC SYSTEM
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bPENED ND-32A
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TRANSFERRED 5,000 GALS FROM NC TO FWST
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MAJORITY WAS TRANSFERRED IN LESS
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NC' PRESS 80 PSIG
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NC TEMP 204 DEGREES F
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PRESSURIZER LEVEL 45% TO 0%
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MANUALLY TRIPPED NC PUMPS AT
200 # NO.1 SEAL DIP
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OPERATOR IMMEDIATELY CLOSED VALVES AND
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MONITORED FWST I OFFSITE RELEASE
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MONITORED RHR PUMP 1A PERFORMANCE
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RESTORED PRESSURIZER LEVEL WITHIN
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RETURNED THE UNIT TU MODE 5 WITHIN
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ROOT CAUSE
HUMAN ERROR
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OPERATOR BECAME CONFUSED.
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CORRECTIVE ACTIONS
ON-GOING CORRECTIVE ACTIONS -
HUMAN PERFORMANCE
(WASHINGTON PRESENTATION)
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ADDITIONAL CORRECTIVE ACTIONS -
HUMAN PERFORMANCE
flNITIATED BY THIS EVENT)
EQUIPMENT EVALUATION
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ON-GOING CORRECTIVE ACTIONS -
HUMAN PERFORMANCE
(WASHINGTON PRESENTATION)
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CONFIGURATION CONTROL
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EFFECTS OF ON-GOING CORRECTIVE ACTIONS
TAILGATE MEETING
ACTIVITY CONTROLLED BY PROCEDURE -
NOT COMPLEX
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NO OTHER ACTIVITIES IN PROGRESS
SUCCESSFUL COMPLETION OF TEST ON
'A' TRAIN
OPERATOR TESTIMONIAL
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ADDITIONAL CORRECTIVE ACTIONS
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PROCEDURES
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SUBSEQUENT ACTIONS
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NRC INVOLVEMENT - JUNE 11TH TO 14TH
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EXTENSIVE REVIEWS I ANALYSES COMPLETED
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REGION il I NRR BRIEFED -
JUNE 14TH
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SAFETY SIGNIFICANCE EVALUATION
REACTOR COOLANT DIVERSION TO FWST
SCENARIO
INITIAL CONDITIONS:
0
- 195 F
- 355 PSIG
- DECAY HEAT 7 MW
- NORMAL PRESSURIZER LEVEL
- TWO REACTOR COOLANT PUMPS ON
- STEAM GENER ATORS OPERABLE
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- RHR TRAIN A IN SERVICE
- RHR TRAIN B EXITING TEST
(PUMP OFF, SUCTION ISOLATED, DISCHARGE ALIGNED TO
FWST THROUGH VALVE ND-33)
- LOCAL CLOSURE OF VALVE ND-33 IN PROGRESS
INITIATING EVENTS:
- RHR TRAIN B SUCTION VALVES FROM RCS OPENED (ND36B k
4
ND37A): DIVERSION TO FWST FROM TRAIN. B
- RHR TRAIN A X-CONNECT VALVE (ND32A) TO TRAIN B
DISCHARGE OPENED: PUMPED DIVERSION TO FWST FROM
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OPERATOR ACTIONS REQUIRED FOR MITIGATION AND RECOVERY
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ISOLATE RCS LEAK PATHS
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TRAIN A:
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QR
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" - CLOSE ND 32A REMOTELY
- ND33 CLOSURE ALREADY. UNDERWAY
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- ISOLATION VIA OTHER REMOTE VALVES
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TRAIN B:
" e ISOLATE SUCTION- FROM RCS
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o ISOLATE DISCHARGE TO FWST OR LEAK
- CLOSE ND65 REMOTELY
- ND33 CLOSURE ALREADY UNDERWAY
- REMOTE ISOLATION VIA OTHER VALVES
2)
RESTORE RCS INVENTORY
e NV (CHARGINGISI PUMP) FROM FWST-
"
e ND (RHR PUMP) FROM FWST -
e COLD LEG' ACCUMULATORS - LOCAL RESTORATION TO
SERVICE
e NI (SI PUMP) - LOCAL RESTORATION TO SERVICE
3)
ESTABLISH A HEAT SINK
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4)
STABILIZE UNIT
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ACTIONS TAKEN (**'>
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1) CLOSE ND32A - 30 SECONDS
ISOLATE RHR TRAIN B SUCTION - 5 MINUTES -
2) ALIGNED NV PUMP TO FWST - 6 MINUTES
3) RESTORE ND TRAIN A RHR MODE - 30 SECONDS
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4) UNIT . ABILIZED - 15 MINUTES
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ALSO: RCPs TRIPPED ON LOW #1 SEAL
DELTA-P AND HIGH VIBRATION
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CONCLUSIONS
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OPERATOR ACTION WAS REQUIRED TO CORRECT A SITUATION
INITIATED BY OPERATOR ERROR
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OPERATOR RESPONSE WAS EXCELLENT
- OPTIMUM ACTIONS TAKEN
- RAPID RESPONSE
- UNIT WAS QUICKLY STABILIZED.
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CONSEQUENCES LIMITED TO A LOSS OF APPROXIMATED 5,000 GAL OF
PRIMARY COOLANT. THE PRESSURIZER DID NOT EMPTY.
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REVIEW OF POSFIBLE DAMAGE TO EQUIPMENT CONFIRMED THAT NONE ,
OCCURRED.
I
.
- PRESSUR12ER HEATUP AND COOLDOWN LIMITS WERE EXCEEDED.
.
VENDOR EVALUATION CONCLUDED NO OPERABILITY CONCERN
'
EXISTED.
- RCPs WERE NOT DAMAGED
- ND PUMP 'A' NOT DAMAGED DUE TO BRIEF HIGH FLOW SITUATION
- ND HEAT EXCHANGER 'A' NOT DAMAGED
- NO DA?,iAGE TO PIPING AND SUPPORTS
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'
'L RESULTING DOSE RATE (0.406 MREMlYR) IS 0.08% OF THE TECH
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,.
SPEC LIMITS
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BASED ON:
- MODE 5 INITIAL CONDITIONS
,
!
- LIMITED LOSS OF RCS INVENTORY
- NO EQUIPMENT DA'MGE
I
- VERY LOW DOSE CONSEQUENCE
,
- AVAILABILITY OF REDUNDANT MEANS OF MITIGATING AND
RECOVERING FROM THE EVENT
THE EVENT IS CONSIDERED TO BE LOW IN SAFETY SIGNIFICANCE
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