ML15260A197

Provides Summary of Meeting at Region 2 in Atlanta,Ga on 910321 Re Details of Investigation on 910308 Event at Facility Concerning Loss of DHR Capability & Reactor Coolant Inventory

ML15260A197
Person / Time
Site:	Oconee
Issue date:	03/27/1991
From:	Reyes L NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
To:	Tuckman M DUKE POWER CO.
References
NUDOCS 9104230273
Download: ML15260A197 (19)

Text

MAR 2 7 1991 Docket Nos. 50-269, 50-270, 50-287 License Nis. DPR-38, DPR-47, DPR-55 Duke Power Company ATTN:

MrL M. S. Tuckman, Vice President Nuclear Operations P. 0. Box 1007 Charlotte, NC 28201-1007 Gentlemen:

SUBJECT:

MEETING

SUMMARY

OCONEE NUCLEAR STATION -

DOCKET NO. 50-287 This letter refers to the meeting conducted at the NRC Region II office in Atlanta on March 21, 1991.

The purpose of the meeting was for your staff to present details of your investigation on 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.

Enclosed is,a list of the meeting attendees and a copy of Duke's presentation.

It is our opinion that this meeting was beneficial and provided the NRC staff with a clear understanding of the circumstances associated with this event.

Should you have any questions concerning this letter, please let us know.

Sincerely, Luis A. Reyes, Director Division of Reactor Projects

Enclosures:

1. List of Attendees

2. Presentation Summary cc w/encls:

H. B. Barron Station Manager Oconee Nuclear Station P. 0. Box 1439 Seneca, SC 29679 A. V. Carr,.Esq Duke Power Company 422 South Church Street Charlotte, NC 28242-0001 (cc w/encls cont'd -

see page 2) 9104230273 910327 PDR ADOCK 05000269 S

PDR

Duke Power Company 2

MAR 27 1991 cc w/encls:

(Continued)

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 Sireet, NW.

Washington, D. C. 20005 Office of Interqovernmental 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 Columbial SC 29201 Manager, LIS NUS Corporation 2650 McCbrmick 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

MAR 71 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. Miller, RII G. A. Belisle, RII

/A. R. Herdt, RH Document Control Desk NRC Resident Inspector U.S. Nuclear RegulatoryCommission Route 2, Box 610 Seneca, SC 29678 Rn:

RII:DRP RII:QRP Wl 1er ABelisle AHerdt 3/,'91 3/; */91 3/' /91

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 G. F. Rothenberger, Superintendent of Integrated Scheduling, ONS H. R. Lowery, Chairman, Oconee Station Review Group

0. C. Kohler, Licensing Coordinator, ONS T. E. Wehrman, Nuclear Production Engineer, ONS Nuclear Regulatory Commission J. L. Milhoan, Deputy Regional Administrator, Region II (RII)

L. A. Reyes, Director, Division of Reactor Projects (DRP), RH E. W. Merschoff, Deputy Director, DRP, RII G. C. Lainas, Assistant Director for Region II Projects, Office of Nuclear Reactor Regulation (NRR)

T. A. Peeblles, Chief, Operations Branch, Division of Reactor Safety (DRS), RI G. A. Belisle, Chief, Reactor Projects Section 3A, DRP, RII W. H. Miller, Project Engineer, DRP, RH P. H. Skinner, Senior Resident Inspector, ONS, RII L. S. Mell en, Operational Programs Inspector, DRS, RII T. A. Reed, Project Manager, NRR C. P. Goodman, Human Factors Specialist, NRR W. C. Lyon, Senior Reactor Engineer, NRR F. Jape, Chief., Test Program Section, DRS, RII

ENCLOSURE 2 LOSS OF SHUTDOWN COOLING OCONEE NUCLEAR STATION MARCH 8, 1991 SYSTEM OVERVIEW VALVE 3LP-19 OUTAGE SEQUENCE SEQUENCE OF EVENTS INVESTIGATION AND REPORTING PROCESS OUTAGE PLANNING PROCESS USE OF GL 88-17, VOGTLE EXPERIENCE CORRECTIVE ACTIONS LESSONS LEARNED

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RB AB To either LP19 or LP20 (Typical of two Unes)

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 INITIATED 2/25/91 LEAK TEST COMPLETE 2/25/91 3LP-19 REPACKED AND MOTOR 3/5/91 RECONNECTED 3/8/91 VESSEL LEVEL IS APPROXIMATELY 76" 3/8/91 3LP-19 RELEASED TO TECHNICIANS 07:30 TO ADJUST LIMITS 3/8/91 OPERATORS CLEARED TAGS ON 07:54 3LP-19 HANDWHEEL AND BREAKER

3/8/91 TECHNICIAN BEGINS MANUALLY 08:48 OPENING 3LP-19 3/8/91 LEVEL ALARMS RECEIVED ON 08:48:37 REACTOR BUILDING NORMAL AND EMERGENCY

SUMPS, RO OBSERVES VESSEL LEVEL AT 20" 3/8/91 RX VESSEL ULTRASONIC LEVEL SENSOR 8:50:57 ALARM RECEIVED 3/8/91 ABNORMAL PROCEDURE FOR LOSS OF 08:52 SHUTDOWN COOLING

ENTERED, RP PERSONNEL AT HATCH NOTIFIED OF LEAKAGE INTO REACTOR BUILDING 3/8/91 OPERATING LPI PUMP STOPPED DUE 08:52:32 TO ABNORMAL MOTOR AMPERES

3/8/91 3LP-21 AND 3LP-22 OPENED FOR 08:56:30 VESSEL MAKEUP PER PROCEDURE 3/8/91 3LP-21 AND 3LP-22

CLOSED, 08:57:21 OPERATOR DISPATCHED TO CLOSE 3LP-19 BREAKER 3/8/91 TECHNICIAN OBSERVES OPERATORS 09:00 APPROACHING AND CLOSES 3LP-19 3/8/91 3LP-21 AND 3LP-22 OPENED TO 09:02:52 REFILL REACTOR VESSEL 3/8/91 VESSEL LEVEL AT 76", 3LP-21 AND 3LP-22 09:05:32 CLOSED 3/8/91 LPI PUMP 3A IS VENTED 09:09 3/8/91 LPI PUMP 3A IS STARTED, FORCED COOLING 09:11:02 IS RE-ESTABLISHED

COOLING OPTIONS AVAILABLE RECLOSE 3LP-19 AND RECOVER FORCED COOLING (ACTUAL)

CLOSE 3LP-6 OR 3LP-7 AND MAINTAIN LEVEL AT THE HOT LEG NOZZLE FROM THE BWST CLOSE 3LP-1 OR 3LP-2 OR 3LP-3 AND REFLOOD THE VESSEL (AND CANAL IF NEEDED) FROM THE BWST

RADIOLOGICAL CONSEQUENCES EQUIPMENT HATCH AND PERSONNEL HATCHES WERE CLOSED ONE REACTOR BUILDING PURGE PENETRATION WAS OPEN (FILTERED),

WITH ISOLATION CAPABILITY FROM THE CONTROL ROOM REACTOR BUILDING DOSE RATES ABOVE THE VESSEL INCREASED DUE TO LOSS OF SHIELDING RADIATION MONITORS (DESIGNED FOR FUEL HANDLING EVENT) HAD BEEN REMOVED FROM SERVICE FOR REPLACEMENT REACTOR BUILDING EVACUATION WAS PROCEDURALLY TIED TO INITIATION OF CONTAINMENT CLOSURE MAXIMUM DOSE TO AN INDIVIDUAL IN THE BUILDING DURING THE EVENT WAS 40 mr

EVENT NOTIFICATIONS OCONEE SAFETY REVIEW GROUP CORPORATE DUTY OFFICER REGION II (PIERCE SKINNER)

ONRR (LEN WEINS)

NRC OPERATIONS CENTER (RED PHONE)

INPO EVENT ANALYSIS SECTION

INVESTIGATION PROCESS INVESTIGATION ASSISTANCE PROVIDED BY:

OCONEE SAFETY REVIEW GROUP STATION LINE MANAGEMENT DESIGN ENGINEERING - SAFETY ANALYSIS INVESTIGATION ASSISTANCE OFFERED BY:

CORPORATE NUCLEAR SAFETY ASSURANCE B&W OWNERS GROUP HUMAN PERFORMANCE EXCELLENCE TEAM DEPARTMENT MANAGEMENT

OUTAGE PLANNING PROCESS MAINTENANCE PLANNING OUTAGE MANAGER OPERATIONS STAFF (SRO)

(SRO)

MAINTENANCE SCHEDULING OPERATIONS STAFF (SRO)

MAINTENANCE CRAFT UNIT SUPERVISOR (SRO)

WORK RELEASE

USE OF GL 88-17, VOGTLE EXPERIENCE REDUCED INVENTORY DEFINED AS <50" STATION WIDE TRAINING WAS CONDUCTED IN THE IMPORTANCE OF MAINTAINING SHUTDOWN COOLING OUTAGES PLANNED TO ABSOLUTELY MINIMIZE TIME WHILE IN REDUCED INVENTORY CONDITION ALL ACTIVITIES WHICH IMPACT INVENTORY OR COOLING ARE AVOIDED ELECTRICAL SYSTEM DESIGN ALLOWS THE AVAILABILITY OF MULTIPLE POWER SOURCES INDEPENDENT FROM THE SWITCH YARD REQUIREMENTS ARE DOCUMENTED IN A SELECTED LICENSEE COMMITMENT (SLC),

OPERATING PROCEDURES, AND THE OUTAGE NETWORK

CORRECTIVE ACTIONS IMMEDIATE ROOT CAUSE FLANGE INSTALLATION PROCESS LABELING IMPROVEMENT PROCEDURE IMPROVEMENT PHYSICAL BARRIERS WORK PRACTICES AND TRAINING NEEDS COMMUNICATIONS LABELING USE DRAWING USE

SHUTDOWN RISK CONSIDERATIONS LESSONS LEARNED PREVIOUS ASSESSMENTS HAD NOT ADDRESSED ALL ACTIVITIES WHICH COULD RAPIDLY PLACE THE UNIT IN A

REDUCED INVENTORY CONDITION THE ASSOCIATION BETWEEN DOSE RATES AND VESSEL WATER LEVEL WAS NOT CONNECTED THROUGH PLANNING AND PROCEDURES TO LOSS OF INVENTORY CONCERNS CORRECTIVE ACTIONS ANALYZE FOR EVENTS OR FAILURES WHICH COULD LEAD TO UNPLANNED ENTRY INTO REDUCED INVENTORY CONDITIONS, AND IMPLEMENT CONTROLS TO MINIMIZE THEIR POTENTIAL BY ESTABLISHING MULTIPLE BARRIERS WHERE POSSIBLE THROUGH PROCEDURES.

AND

PLANNING, ADDRESS THE NEED FOR CONTINUOUS MONITORING OF CANAL DOSE RATES DURING REDUCED INVENTORY CONDITIONS