ML17263A412
| ML17263A412 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 10/07/1993 |
| From: | Andrea Johnson Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| TAC-M86932, NUDOCS 9310140273 | |
| Download: ML17263A412 (15) | |
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 2055&0001 October
?,
1993 Docket No.
50-244 LICENSEE:
Rochester Gas and Electric Corporation FACILITY:
Ginna Nuclear Power Plant
SUBJECT:
SUMMARY
OF MEETING WITH ROCHESTER GAS AND ELECTRIC CORPORATION ON SEPTEMBER 14, 1993 INAPPROPRIATE ROD MOVEMENT EVENTS OF JUNE 29 AND JULY 5,
- 1993, AT GINNA (TAC NO. M86932)
On September 14, 1993, the NRC met with Rochester Gas and Electric Corporation concerning the inappropriate rod movement events of June 29 and July 5,
- 1993, at the Ginna Nuclear Power Plant (Ginna).
Both'vents, one in automatic and one in manual control, involved a problem with the rod control system where Bank D Group 1 rods moved in the "OUT" direction with an "IN" demand signal.
The licensee discussed the events, the troubleshooting and testing, the
- results, and their safety evaluation that bounds the events.
The licensee had agreed to stay in manual operation until after establishing root cause.
Troubleshooting subsequent to the anomalous rod control events was first performed by the licensee in concert with Westinghouse design and training personnel on June 30, 1993.
At that time the licensee evaluated the most probable cause of failure as the intermittent failure of the high threshold logic "Up" signal for which seven printed circuit (PC) cards were associated.
Of the seven, the A-109 Supervisory logic 2,Card was the highest suspect and was replaced and bench tested.
Testing could not reproduce the problem.
Subsequent to the July 5,
- 1993, anomalous rod control event, the licensee's 18C group performed diagnostic tests.
The results of the diagnostic tests changed focus to the A-105 Master Cycler Logic Card which was replaced and bench tested.
Again testing could not reproduce the problem.
All suspect PC cards were removed from Ginna and tested first at the Salem Training Test Facility and then by Westinghouse Design and Training Personnel at the Braidwood site.
It was observed that noise occurred on "Cycle" and "Hold" signals and the A-105 Master Cycler Logic Card ZllB gate output was abnormal.
However, the problem of inappropriate rod movement could not be duplicated.
Having exhausted all troubleshooting and testing of the suspect
- cards, the licensee sent the A-105 Master Cycler Logic Card to Motorola for failure analysis of the ZllB gate.
Results of this analysi's were not available at the time of the meeting.
The licensee's evaluation to the NRC staff of the events at Ginna concluded that (1) the licensee's troubleshooting had been exhausted, (2) the licensee was confident that the problem had been removed from the Ginna rod control
- system, and (3) the problem was most likely caused by a logic gate failure (Z118) on the A-105 Master Cycler Logic Card.
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October 7,1993 The licensee's evaluation also concluded that the Ginna events were unlike the Salem events because the slave cycler current orders were not corrupted, all rods in the group moved uniformly, and the urgent alarm halted automatic rod motion after one step.
The licensee would like to return the plant to automatic control at this time.
Although the licensee is confident that the problem has been removed from the Ginna rod control
- system, in that all suspect PC cards have been replaced, the root cause for PC card failure is still incomplete pending further testing and evaluation at Motorola.
The staff indicated that they would like a short period of time to review the material presented and that they would inform the licensee, through the Project Manager, of their concurrence or objection to the licensees resuming automatic operation.
Enclosure 1 is a list of meeting attendees.
A copy of the meeting agenda and discussion material is included in Enclosure 2.
Enclosures:
1.
List of Attendees 2.
Meeting Agenda and Discussion Material cc w/enclosures:
See next a e Original signed by Allen R. Johnson, Project Manager Project Directorate I-3 Division of R'eactor Projects I/II Office of Nuclear Reactor Regulation OFF1CE NAHE DATE OFF1CE NAKE DATE LA:P 3
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October 7,
1993 The licensee's evaluation also concluded that the Ginna events were unlike the Salem events because the slave cycler current orders were not corrupted, all rods in the group moved uniformly, and the urgent alarm halted automatic rod motion after one step.
The licensee would like to return the plant to automatic control at this time.
Although the licensee is confident that the problem has been removed from the Ginna rod control system, in that all suspect PC cards have been replaced, the root cause for PC card failure is still incomplete pending further testing and evaluation at Motorola.
The staff indicated that they would like a short period of time to review the material presented and that they would inform the licensee, through the Project Manager, of their concurrence or objection to the licensees resuming automatic operation.
Enclosure I is a list of meeting attendees.
A copy of the meeting agenda and discussion material is included in Enclosure 2.
Enclosures:
I.
List of Attendees 2.
Meeting Agenda and Discussion Material Allen R.
ohns
, Project Manager Project Dir orate I-3 Division of Reactor Projects I/II Office of Nuclear Reactor Regulation cc w/enclosures:
See next page
R.
E. Ginna Nuclear Power Plant CC:
Thomas A. Hoslak, Senior Resident Inspector R.E.
Ginna Plant U.S. Nuclear Regulatory Commission 1503 Lake Road
- Ontario, New York 14519 Regional Administrator, Region I U.S. Nuclear Regulatory Commission 475 Allendale Road King of Prussia, Pennsylvania 19406 Hs.
Donna Ross Division of Policy Analysis L Planning New York State Energy Office Agency Building 2 Empire State Plaza
- Albany, New York 12223 Charlie Donaldson, Esq.
Assistant Attorney General New York Department of Law 120 Broadway New York, New York 10271 Nicholas S.
Reynolds Winston 5 Strawn 1400 L St.
N.W.
Washington, DC 20005-3502 Hs. Thelma Wideman
- Director, Wayne County Emergency Management Office Wayne County Emergency Operations Center 7370 Route 31
- Lyons, New York 14489 Hs. Mary Louise Heisenzahl Administrator, Honroe County Office of Emergency Preparedness ill West Fall Road, Room ll Rochester, New York 14620 Dr. Robert C. Mecredy Vice President, Nuclear Production Rochester Gas and Electric Corporation 89 East Avenue Rochester, New York 14649
~OIBTRIBUTIO Docket. File NRC & Local PDRs PDI-3 Reading T. Hurley/F.Miragl i a J. Partlow S.
Varga J.
Calvo W. Butler A. Johnson S.Little OGC E. Jordan H. Chatterton T. Alexion R.
Perch A. Thadani H. Garg R. Jones ACRS (10)
V. McCree, EDO J. Linbille, RI J.
Rosenthal A. Chaffee D. Wheeler H. Boyle J.
Stone J.
Wermiel E. Harinos S.
Mazumdar J. Durr, RI W. Hodges, RI W. Lazarus, RI W. Ruland, RI G. Lazarowitz, RI
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Enclosure L
LIST OF ATTENDEES MEETING BETWEEN NRC AND ROCHESTER GAS AND ELECTRIC CORPORATION REGARDING INAPPROPRIATE ROD MOVEMENT EVENTS SEPTEMBER 14, 1993 M. 'Chatterton T. Alexion Geor e Wrobel Bob Eliasz Joe Wida Clair Ed ar Gre Rawa Ste hen Fowler Robert Perch Ashok Thadani Hukam Gar Walter Butler Allen Johnson Robert Jones NAME ORGANIZATION NRC SRXB NRC DRPW-IV-1 Rochester Gas
& Electric Rochester Gas
& Electric Rochester Gas
& Electric Rochester Gas
& Electric Rochester Gas
& Electric Westin house NRC DSSA NRC OSSA NRC HICB NRC DRPE-I-3 NRC DRPE-I-3 NRC SRXB
Enclosure 2
GINNA ROD CONTROL SYSTEM EVENT
SUMMARY
JUNE 29 1993 A-25.1 No.93-085 PLANT AT 97% POWER WITH AUTOMATIC ROD CONTROL CONTROL BANK D GROUP 1 AT 211, GROUP 2 AT 210 IN MOTION DEMAND CREATED CBD GROUP 1 STEPPED OUT, GROUP 2 STEPPED IN URGENT ALARM STOPPED ROD MOTION AFTER 1 STEP URGENT ALARMFROM LOGIC CABINET 1BD SLAVE CYCLER (CONTROLS CBD GROUP 1 RODS)
AIVIBIENT TEMPERATURE 87 F
AT TIME OF EVENT DECREASED TO 74 F BY INCREASED VENTILATION RESET URGENT ALARM ROD TEST WERE NORMAL ROD CURRENT TRACES NORMAL
JUNE 30 1993 JULY 4 1993 ROD CONTROL IN MANUAL ANALYZEDPROBLEM CONSULTED WESTINGHOUSE DESIGN AND TRAINING PERSONNEL MOST PROBABLE CAUSE WAS INTERMITTENT FAILURE OF "UP" SIGNAL
'l PRINTED CIRCUIT CARDS ASSOCIATED WITH "UP" SIGNAL
(
A-105 MASTER CYCLER LOGIC A-108 SUPERVISORY LOGIC 1
A-109 SUPERVISORY LOGIC 2
~ A-112 SUPERVISORY BUFFER MEMORY A-113 SUPERVISORY DATA LOGGING A-208 BANK OVERLAP LOGIC 1A
JUNE 30 1993 JULY 4 1993 Con inued A-109 - SUPERVISORY LOGIC 2
- HIGHEST SUSPECT SERVES BUFFER MEMORY AND CONTROL CIRCUIT INPUT TO MASTER CYCLER LOGIC CARD
~ ACCEPTS AND STORES INPUT COMMANDS INHIBITS SYSTEM WHILE MOTION IN PROGRESS FEEDS SLAVE CYCLERS, BANK OVERLAP CIRCUIT, AND DATA LOGGING REPLACED A-109 SUPERVISORY LOGIC 2 CARD CURRENT TRACES OBTAINED PRIOR TO AND AFTER A-109 SUPERVISORY LOGIC 2 REPLACEMENT BANK "D" ROD EXERCISE PERFORM DAILY A-109 SUPERVISORY LOGIC 2 CARD BENCH TESTED
JULY 5 1993 A-25.1 No.93-088 ROD CONTROL IN MANUAL OPERATOR PERFORMED ROD EXERCISE TEST FOR CONTROL BANK "D" IN BANK "D" SELECT ON "IN" DEMAND, GROUP 2 STEPPED IN, GROUP 1 STEPPED OUT OPERATOR REIVIOVED DEMAND AFTER 1 STEP-NO URGENT ALARM
. IRC PERFORMED DIAGNOSTIC TESTS PROBLEM *WOULD NOT RE-OCCUR REPLACED A-105 MASTER CYCLER LOGIC CARD PERFORMED ROD EXERCISE TEST BENCH TESTED A-105 MASTER CYCLER LOGIC CARD
JULY 6 1993
- PRESENT JULY 7 REPLACED REMAINING CARDS ASSOCIATED WITH DIRECTION SIGNAL JULY 8 TESTING OF CARDS AT SALEM TRAINING FACILITY COULD NOT REPEAT PROBLEM MASTER CYCLER LOGIC CARD LOGIC GATE Z11B OUTPUT AT 7V INTERMITTENT URGENT ALARM NOISE ON CYCLE AND HOLD SIGNALS ELEVATED TEMPERATURES HAD NO EFFECT JULY 14 CONTINUED TESTING AT SALEM TRAINING FACILITY COULD NOT REPEAT PROBLEM NOISE ON CYCLE AND HOLD SIGNALS TRACED TO MASTER CYCLER LOGIC CARD LOGIC GATE Z11B
-, ELEVATED TEMPERATURES HAD NO EFFECTS
JULY 30 SENT PRINTED CIRCUIT CARDS TO WESTINGHOUSE TRAINING PERSONNEL AT BRAIDWOOD SITE JULY 31 ROD EXERCISE REDUCED TO WEEKLY AUGUST 17 WESTINGHOUSE COULD NOT DUPLICATE ORIGINAL PROBLEM WESTINGHOUSE CONFIRMS Z11B LOGIC GATE FAILURE AND ITS EFFECTS LONG GO PULSE (30-300 mSEC VS NORMALLY3 mSEC)
RESULTS IN URGENT ALARM (GO WHILE CYCLE)
COULD HAVE CAUSED DIRECTION CHANGE SEPTEMBER 7 SENT MASTER CYCLER LOGIC CARD TO MOTOROLA FOR FAILURE ANALYSIS OF THE Z11B GATE.
COMPARISON TO SALEM EVENT:
SLAVE CYCLER CURRENT ORDERS WERE NOT CORRUPTED
- ALL RODS IN THE GROUP MOVED URGENT ALARM HALTED ROD MOTION AFTER ONE STEP CONCLUSION:
- TROUBLESHOOTING HAS BEEN EXHAUSTED CONFIDENT PROBLEM HAS BEEN REMOVED FROM THE SYSTEM MOST LIKELYCAUSED BY Z11B GATE ON MASTER CYCLER LOGIC CARD