ML20151P127
| ML20151P127 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 12/26/1985 |
| From: | Walker R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Kingsley O MISSISSIPPI POWER & LIGHT CO. |
| References | |
| NUDOCS 8601030308 | |
| Download: ML20151P127 (22) | |
Text
mk l1 gEt 2 ^ G%
dississippiPowerandLightCompany
?!
ATTN: Mr. O. D. Kingsley, Jr.
Vice President, Nuclear Operations P. O. Box 23054 Jackson, MS 39205 Gentlemen:
SUBJECT:
MEETING
SUMMARY
- GRAND GULF, DOCKET N0. 50-416 This refers-to the management meeting conducted at your request in the NRC Region II Office on December 13n 1989.
The meeting was held to discuss the November 6,1985, Emergency Diesel Generator overspeed event at Grand Gulf.
A sumary of the meeting topics is provide 6'in Enclosure 1.
A list of attendees at the meeting is shown in Enclosure 2.
It is our opinion that this meeting was beneficiaT in that it provided us with a better understanding of the circumstances contributing to the event and corrective actions taken/ lessons learned.
Should you have any ouestions concerning. these matters, we will be pleased to discuss them.
Sincerely, r
CI W Vir $ i Roger D. Walker, Director Division of Reactor Proiects
Enclosures:
1.
Meeting Summary 2.
Meeting Attendees 3.
Meeting Outline Submitted by Mississippi Power and Light Company jcw/encls:
T. H. Cloninger, Vice President, Nuclear Eng. & Support
..E. Cross, General Manager
. F. Dale, Director, Nuclear Licensing
/'.andSafety p
R T. Lally, Manager of Quality Assurance a
' fr j Middle South Services, Inc.
vR. B. McGehee, Esquire Wise, Carter, Child, Steen and Caraway cc w/encls: (cont'd on page 2) g.
/
B60103030s 851226
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DEC 2 61985 Mississippi Power and Light Company P.
c w/encls:
. S. Reynolds, Esquire Bishop Liberman, Cook, Purcell
& Reynolds W. Jackson, Project Engineer
. R. Hutchinson,'GGNS, General Manager c w/encls:
RC Resident Inspector Document Control Desk State of Mississippi
't RI RII j RII RII b
- RCarroll:bhg VPangiera VBrownlee AGibson 12//f/85 12/jp/85 12/p>/85 12/33/85 c>tt> $rY p+"
DEC 2 C F ENCLOSURE 1 MEETING
SUMMARY
On December 13, 1985, representatives of Mississippi Power and Light Company (MP&L) met with the NRC at MP&L's request, in the Regional office in Atlanta, Georgia.
The topic of discussion was the November 6,1985, Emergency Diesel Generator overspeed event at Grand Gulf with respect to the contributing cir-cumstances and corrective actions taken/ lessons learned.
MP&L commenced their presentation by confirming that the Division 1 Emergency Diesel Generator was being tested per a Special Instruction following preventive maintenance which had required draining the oil from the governor.
After a successful start, the engine surged to over.600 RPM causing extensive engine damage before it could be shutdown.
From their investigation, the licensee concluded that the cause of the overspeed was the governor not being properly filled with oil and inadequate overspeed protection for this type event. Conse-quently, the licensee has taken the following corrective actions:
(1) Revised the governor fill and vent procedure to include air rolling the diesel and refilling the governor until no level decrease is observed after air rolling.
(2) Revised the existing operating instruction to require: checking of the governor oil level prior to manual' starts; the performance of an overspeed timing check within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of starting the diesel; stationing of an operator at the manual push-pull shutdown switch; and reducing the hydraulic governor load limit to 40% in order to limit acceleration after governor maintenance.
(3) Conducted training of diesel mechanics and operators to make them aware of the potential for an overspeed event such as this and the precautions /
actions to be taken in order to prevent it.
Additionally, the licensee indicated that the diesel manufacturer, Transamerica DeLeval Incorporated (TDI), has proposed modifications to reduce fuel rack and air strangulation valve shutoff times from 4-6 seconds to 1.0 second. Pending final MP&L " technical review and acceptance, these modifications will be implemented.
Although not considered as contributing factors to the overspeed event, MP&L also identified the use of Special Instructions and maintaining vendor manuals c
up-to-date as areas requiring improvement.
Unlike the Standard Operating Instruction, the Special Instruction being used during this event did not require the governor speed control to be reduced before starting the diesel. Accordingly, the licensee stated that this Special Instruction, which was written by a foreman, received an inadequate enaineering review.
Consequently, Special Instructions for major rotating equipment will now require a maintenance engineering signoff and an operations management review and signoff.
Also, where possible, Special Instructions will reference /make use of applicable Standard Operating Instructions.
DEC 2 01985 Meeting Sunnary 2
Regarding vendor manual updating, MP&L agreed that their Woodward Governor technical manual did not reflect the latest revision. However, they stated that even the latest revision inadeauately addressed the filling of the governor, and would not have prevented the overspeed event.
MP&L contacted all appropriate subvendors to TDI in order to obtain updated information, and is working with the TDI owners group and INP0 to ensure the industry is aware of the event and associated findings.
. s e
o
DEC 2 61985 ENCLOSURE 2 MEETING ATTENDEES U. S. Nuclear Regulatory Commission A. F. Gibson, Director, Division of Reactor Safety (DRS)
V. L. Brownlee, Chief, Reactor Projects Branch 2, Division of Reactor Projects (DRP)
V. W. Panciera, Chief, Reactor Projects Section 28, DRP H. C. Dance, Chief, Reactor Projects Section 2A, DRP T. E. Conlon, Chief, Plant Systems Section (PSS), DRS R. C. Butcher, Grand Gulf Senior Resident Inspector R. E. Carroll, Jr., Project Engineer, Reactor Projects Section 2B, DRP T. F. McElhinney, Reactor Engineer, PSS, DRS T. D. Gibbons, Electrical Engineer, PSS, DRS C. H. Berlinger, Chief, TDI Project Group, Reactor Systems Branch, NRR L. L. Kintner, Project Manager, Licensing Branch 1, Division of Licensing, NRR J. C. Stone, Chief, Program Coordinator Section, Vendor Program Branch (VPB), IE W. P. Haass, Senior Vendor Inspector, VPB, IE E. H. Trottier, Inspector, VPB, IE J. C. Higgins, Consultant, Brookhaven National Laboratory Mississippi Power and Light Company
- 0. D. Kingsley, Vice President, Nuclear Operations J. E. Cross, Site Director L. F. Dale, Director, Nuclear Licensing and Safety J. Cesare, Manager, Nuclear Licensing C. W.. Angle, Principal Engineer R. S. Lewis, Material Science Engineer R. Moomaw, I&C Superintendent C
C
ENCLOSUmE 3 DIESEL GENERATOR MEETING MP&L/NRC ATLANTA GA.
DECEMBER 13, 1985 INTRODUCTION OLIVER KINGSLEY OPERATIONAL AND MAINTENANCE ASPECTS OF EVENT JIM CROSS PREVENTIVE MAINTENANCE PERFORMED DIESEL RETEST SEQUENCE DIESEL CONDITION IMMEDIATELY AFTER OVERSPEED CAUSE OF OVERSPEED PREVENTION OF RECURRENCE-0THER AREAS FOR IMPROVEMENT DESIGN AND OWNERS GROUP INITIATIVES BILL ANGLE TDI DESIGN CHANGE INTERFACE WITH OWNERS GROUP GENERIC LETTER 83-28 AND VENDOR INTERFACE LARRY DALE J19 MISC 850601 - 1
F DIESEL GENERATOR OVERSPEED OCCURRENCE TASK FORCE FORMED TO INVESTIGATE THE FOLLOWING:
ACTIVITIES AND CONDITIONS LEADING TO EVENT DESCRIPTION OF EVENT INSPECTION AND ANALYSIS FINDINGS ALL CAUSES AND CONTRIBUTING FACTORS REPAIR REASSEMBLY REQUALIFICATION NEEDED DESIGN CHANGES ACTIONS TO PREVENT RECURRENCE VENDOR INTERFACE MEETING REQUESTED BY MP8L WITH THE NRC (18E AND NRR) TO ADDRESS THE FOLLOWING:
OPERATIONAL AND MAINTENANCE ASPECTS OF EVENT AND CORRECTIVE ACTION (SPECIFIC AND GENERIC)
DESIGN AND OWNERS GROUP INITIATIVES GENERIC LETTER 83-28 AND VENDOR INTERFACE J13 MISC 85121101 - 1
[.
DIVISION I DIESEL GENERATOR OVERSPEED I.
PREVENTIVE MAINTENANCE AND DR OR A.
INSPECT CAMS, IAPPETS AND PUSHRODS B.
INSPECT TURBOCHARGER ROTO FLOAT AND RING BOLTS C.
INSPECT CONNECTING RODS AND BOLTS D.
TEST FUEL INJECTOR N0ZZLES E.
REPLACE GOVERNOR DRIVE ELEMENT AND CHANGE OIL i
F.
INSPECT. CRANKCASE INTERIOR G.
INSPECT GEARBOX GEARS AND LUBE OIL JET SPRAY H.
INSPECT AND ADJUST HYDRAULIC LIFTERS I.
CHECK GEAR BACKLASH J.
ITEMS A, B, C, AND D ARE DR QR REQUIRED J16 MISC 85121201 - 1
m II.
DIESEL RESTART SEQUENCE A.
DC BREAKER OPENED B.
DIESEL AIR ROLLED AND PRELUBRICATED C.
DIESEL STARTED, CAME TO 495-525 RPM'S D.
SHUTDOWN ACTIONS 1.
OPERATOR PUSHED EMERGENCY ELECTRICAL SHUTDOWN BUTTON 2.
PUSHED MANUAL RUN/ SHUTDOWN BUTTON 3.
UNLOCKED FUEL OIL VALVE 4.
PUSHED-PULL SHUTDOWN BUTTON - PUSHED FOR TRIP III. DIESEL CONDITION AFTER OVERSPEED l
A.
DC OUTPUT BREAKER OPENED B.
OVERSPEED DEVICE TRIPPED C.
RUN/ SHUTDOWN BUTTON IN SHUTDOWN D.
MECHANICAL GOVERNOR SPEED SETTING - 470 RPM E.
NO OIL IN GOVERNOR SIGHT GLASS F.
GOVERN 0R BOOSTER CYLINDER FULL OF OIL G.
OvERSPEED TRIP TIME RESPONSE 35 5 SEC.
J16 MISC 85121201 - 2
IV.
CAUSE OF OVERSPEED e
A.
GOVERNOR NOT PROPERLY FILLED 1.
OIL LEVEL NOT CHECKED AFTER AIR ROLL 2.
GUIDANCE INADEQUATE TO MECHANICS AND OPERATORS ON FILL AND VENT OF GOVERNOR 3.
FUEL RACKS NOT RESTRAINED AFTER GOVERN 0R MAINTENANCE TO LIMIT ACCELERATION B.
ENGINE OVERSPEED PROTECTION 1.
OVERSPEED 5 SEC. TO FULLY CLOSE FUEL RACKS 2.
' DIESEL ACCELERATION AT TRIP SPEED 50- 98 RPM /SEC 3.
OVERSPEED PROTECTION NOT ADEQUATE TO PROTECT ENGINE FOR THIS EVENT J16 MISC 85121201 - 3
A NORMAL UtEXCITED START GOVERNOR SET 6 300 RPM soo 700 600 500 ATING 400 300 200 100 i
i 5
10 15 20 25 30 TIME, see FIGURE I o
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NOVEMBER 6,1985 OVERSPEED EVENT 4 '
GOVERNOR SET G470 RPM UNEXCITED, LOW OL LEVEL 800 700 I
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500 N
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m OPER ATING AUTO TRIP F RACKS N
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V.
ACTIONS TO PREVENT OVERSPEED A.
VENTING PROCEDURE REVISION 1.
FILL GOVERNOR TO PROPER LEVEL 2.
f.!R ROLL DIESEL - 15 SEC.
3.
CHECK AND REFILL GOVERNOR AS NEEDED 4.
GOVERNOR FILLED PROPERLY - NO LEVEL DECREASE AFTER AIR ROLL B.
SYSTEM OPERATING INSTRUCTION REVISION 1.
CHECK GOVERNOR OIL PRIOR TO MANUAL STARTS 2.
OVERSPEED TIMING CHECK PERFORMED WITHIN 24 HOURS PRIOR TO STARTING DIESEL 3.
STATION OPERATOR AT MANUAL PUSH-PULL SHUTDOWN SWITCH 4.
HYDRAULIC GOVERNOR LOAD LIMIT REDUCED TO 40% TO LIMIT ACCELERATION AFTER GOVERNOR MAINTENANCE C.
TRAINING 1.
DIESEL MECHANICS 2.
OPERATORS J16 MISC 85121201 - 4
VI.
OTHER AREAS FOR IMPROVEMENT A.
IDENTIFICATION 1.
FOREMAN WROTE SPECIAL INSTRUCTION 2.
MAINTENANCE ENGINEERS REVIEW INADEQUATE 3.
GOVERNOR SPEED CONTROL NOT REDUCED 4.
SPECIAL INSTRUCTION SHOULD USE S0I WHERE POSSIBLE 5.
VENDOR MANUAL UPDATES B.
RESOLUTION 1.
TRAINING ON SPECIAL INSTRUCTION RESPONSIBILITIES 2.
REMOVE GOVERNOR SPEED CONTROL FROM MAINTENANCE PROCEDURE - PLACE IN S01 i'
3.
SPECIAL INSTRUCTIONS FOR MAJOR ROTATING EQUIPMENT -
WILL REQUIRE MAINTENANCE ENGINEERING SIGNOFF AND AN OPERATIONS MANAGEMENT REVIEW AND SIGNOFF i
J16 MISC 85121201 - 5
TDI EC0ftENDED P0DIFICATION PbDIFICATIONS WERE PROPOSED TO REDUCE FUEL RACK AND AIR STRANGLLATION VALVE SHUT 0FF TIES FROM 4-6 SECONDS TO 41.0 SECOND I
~
PbDIFICATION PROVIDES AIR DIRECTLY TO VALVE SFUTOFF CYLINDERS PROVIDES FOR DEDICATED INDEPENDENT H.P. 250 PSI AIR SOURCE REGlfJTED TO 60 PSI PROVIDES SHORTER AIR PAE TO SHUT 0FF VALVES PbDIFICATION INCREASES AIR LINE SUPPLY TUBING SIZE TO REDUCE RESISTANCE LARGER AIR OPERATED 3-VALVES RECortENDED TO FURTHER DECREASE RESPONSE TIME W SLI 02 ZFM
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CONClljSIONS OF PROPOSED DESIGN K0 PROTOTYPE WAS SUCCESSFULLY DEMONSTRATED IN IDI SHOP ON V-16 ENGINE RESPONSE TIME FOR FULL CLOSURE OF FUEL RACKS AND AIR VALVES WAS <.1.0 SECONDS SYSTEM HAS BEEN RECENTLY ADDED TO A COMERCIAL UNIT BY TDI DESIGN WILL REDUCE PROBABILITY OF OCCURRENCE OF A DAMAGING OVERSPEED EVENT IMPLEMENTATION ON GGNS ENGINES SCHEDULED FOR OUTAGE OF SUFFICIENT DUPATION PENDING FINAL PPal TECiti! CAL REVIEW AND ACCEPTANCE e
J16NDASLI 02 - 24
GGNS VAINTENANCE/SURVEILLANE PROGRAM OWERS GROUP KT IN lOEPBER 1985 AND APPROVED FORPATION OF M/S EVALUATION TASK FORE TO REVIEW EACH UTILITIES PROGRAM TASK FORE COMPRISED OF EXPERIENED PERS0h7EL FROM UTILITIES PLUS TDI REP PROGRAM TO INCLUDE:
- PROGRAM EXCEPTIONS REVIEW
- TECH BASIS EVALUATION
- DEVELOP GENERIC M/S DOCUKhT FOR EACH ENGINE TYPE
- STANDARDIZE M/S INTERVAL SCHEDULES WITH ElHiASIS ON OlffAGES
- PROVIDE UTILITIES WITH DRAFT REFORT
- ifTILITY E MBERS WILL REVIEW AND DISPOSITION FINAL DRAFT
- F NAL DOCUE NT WILL BE PROVIDED TO UTILITIES PROGRAM PROVIDES THE BENEFITS OF t0RE RECENT UTILITY EXPERIENE, VENDOR ANDTECHNICAL-INPUT NOASLI 02 zrM
OWNERS GROUP INTERFACE OVERSPEED EVENT REPORTED To OG EVALUATION TASK FORCE VIA LETTER SEQUENCE OF EVENTS DESCRIBED SUGGESTED UTILITIES REVIEW:
PROCEDURES AND REVISE AS APPROPRIATE VENDOR MANUALS TDI SIM #347 SUGGESTED GOVERNOR MAINTENANCE BE ADDRESSED BY OG TASK FORCE, AND REVISION BE MADE TO THE GENERIC M/S DOCUMENT ADDITIONAL NOTIFICATIONS WERE ALSO MADE TO EACH OF 12 TDI D/G OWNERS f
J16 MISC 85121201 - 6
GENERIC LETTER 83-28 AND VENDOR INTERFACE RESPONSE TO GENERIC LETTER 83-28 COMMITTED IN AECM-84/508 AND -85/157 TO UTILIZE INP0 VETIP RECOMMENDATIONS AS BEST, MOST RELIABLE METHOD OF DISSEMINATING TECHNICAL INFORMATION.
CONSISTENT WITH INDUSTRY PARTICIPANT IN NPRDS AND SUBMITS REQUIRED COMPONENT ENGINEERING AND FAILURE DATA.
PARTICIPATION IN SEE-IN PROGRAM.
RECEIPT AND PROCEDURALLY CONTROLLED EVALUATION OF SER'S AND S0ER's.
VENDOR REPORTING UNDER 10CFR21 AND PROCEDURALLY CONTROLLED EVALUATION OF INFORMATION.
MAINTENANCE OF SAFETY-RELATED EQUIPMENT PERFORMED USING APPROVED PROCEDURES BASED ON VENDOR RECOMMENDATIONS.
PROCEDURAL CONTROLS FOR RECEIPT, ENGINEERING REVIEW, DISTRIBUTION, MAINTENANCE AND USE OF VENDOR MANUALS.
JUNE 1984 WROTE 273 LETTERS TO ESTABLISH INTERFACE WITH SAFETY-RELATED EQUIPMENT VENDORS.
RECEIVED 33%
RESPONSE.
MANPOWER TO MAINTAIN DIRECT VENDOR INTERFACE PROGRAM PROHIBITIVE.
BETTER EFFICIENCY USING IhP0 VETIP.
SUMMARY
PROGRAMS ALREADY IN PLACE MEET INTENT OF NRC PROPOSED VENDOR INTERFACE PROGRAM.
f J13 MISC 85120501 - 4
l TDI INTERFACE TDI SERVICE INFORMATION MEMOS (SIM'S)
RECENT OVERSPEED EVENT MP8L HAS CONTACT :D ALL APPROPRI ATE SUBVENDORS TO TDI TO OBTAIN UPDATED INFORMATION MP8L HAS INFORMED THE TDI OWNERS GROUP (0G) 0F THE OVERSPEED EVENT.
MPal HAS ADVISED ALL 12 TDI UTILITIES THROUGH NUCLEAR NETWORK MEMOS ADDRESSING THE OVERSPEED EVENT.
MP8L IS REPORTING TO ALL OTHER UTILITIES THROUGH INP0 NUCLEAR NETWORK.
UPDATED WOODWARD MANUAL WOULD NOT HAVE PREVENTED THE OVERSPEED EVENT.
J13 MISC 85120501 - 5