ML20045E509
| ML20045E509 | |
| Person / Time | |
|---|---|
| Site: | Hatch  |
| Issue date: | 06/03/1993 |
| From: | Merschoff E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Hairston W GEORGIA POWER CO. |
| References | |
| NUDOCS 9307020157 | |
| Download: ML20045E509 (24) | |
Text
__
.7 5
JUN 0 31993 Docket Nos. 50-321, 50-366 License Nos. DPR-57, NPF-5 Georgia Power Company ATTN: Mr. W. G. Hairston, III Senior Vice President Nuclear Operations P. O. Box 1295 Birmingham, AL 35201 Gentlemen:
SUBJECT:
MEETING
SUMMARY
- HATCH UNITS 1 AND 2 This refers to the management meeting conducted in the Region II office on May 19, 1993. This meeting was held at our request to discuss operator performance and NRC's expectations involving the Unit I loss of shutdown cooling event on April 14, 1993 which is discussed in our Inspection Report No. 50-321 and 366/93-06. A brief summary, a list of attendees, and a copy of your handout is enclosed.
It is our opinion that the meeting was mutually beneficial. We will. evaluate the effectiveness of your corrective actions during future inspections.
In accordance with 10 CFR 2.790 of the NRC's " Rule of Practice," a copy of this letter and its enclosures will be placed in the NRC Public Document Room.
Should you have any questions concerning this letter, please contact us.
Sincerely, u.t)
$ bA Ellis W. Merschoff, Director Division of Reactor Projects l
Enclosures:
l 1.
Management Meeting l
Summary 2.
Management Meeting Presentation Material 3.
List of Attendees j
cc w/encls: See page 2 9307020157 930603 PDR ADOCK 05000321 1-S PDR S {}
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.r JUN 0 31993 Georgia Power Company 2
ccw/encls: ~ Continued J..T. Beckh'am i
Vice President, Plant' Hatch Georgia Power Company P. O.. Box 1295 Birmingham,' AL 35201 H. L. Sumner General Manager, Plant Hatch Georgia Power Company Route 1, Box 439 Baxley, GA 31513 S. J. Bethay Manager Licensing - Hatch Georgia Power Company P. O. Box 1295 Birmingham, AL 35201 Ernest L. Blake, Esq.
Shaw,.Pittman, Potts and Trowbridge 2300 N Street, NW Washington, D. C.
20037 Charles H. Badger Office of Planning and Budget Room 610 270 Washington Street, SW Atlanta, GA 30334 Harold Reheis, Director Department of Natural Resources 205 Butler Street, SE, Suite 1252 Atlanta, GA 30334
. Thomas Hill, Manager Radioactive Materials Program Department of Natural Resources 4244 International Parkway Suite 114 Atlanta, GA 30354 cc w/encls:
(Continued page 3)
4 JUN 0 31993
- Georgia-Power Company 3
cc w/encls: Continued
- Chairman Appling County Commissioners County Courthouse Baxley, GA 31513 Dan H. Smith Vice President
' Power Supply Operations Oglethorpe Power Corporation 2100 E. Exchange Place Tucker, GA 300B5-1349 Charles A. Patrizia, Esq.
- Paul, Hastings, Janofsky & Walker 12th Floor 1050 Connecticut Avenue, NW Washington, D. C.
20036 bec w/encls:
K. N. Jabbour, NRR D. A. Seymour, RII A. R. Herdt, RII P. H. Skinner, RII S. J. Vias, RII Document Control Desk NRC Resident Inspector U.S. Nuclear Regulatory Commission Route 1, Box 725-Baxley, GA 31513 FILE:
G:\\HATHMTMT.DAS
- FOR PREVIOUS CONCURRENCE SEE ATTACHED RII RII
- DSeymour
- PSkinner
/- /92
/ /92 i
9
~-
u-Georgia Power Company 3
cc w/encls: Continued n H. Smith'-
V1 e President Po r Supply Operations-Ogle horpe Power Corporation 1
2100-. Exchange Place Tucker, GA. 30085-1349 Charles
. Patrizia, Esq.
Paul, Has. ngs, Janofsky & Walker 12th Floor 1050 Connec icut Avenue, NW Washington, C.
20036 bec w/encls:
K. N. Jabbour, tSR D. A. Seymour, RI A. R. Herdt, RII-P. H. Skinner, RII S. J. Vias, RII Document Control Des NRC Resident Inspector U.S. Nuclear Regulatory Commission Route 1, Box 725 Baxley, GA 31513 FILE:
G:\\HATMMTMT.DAS P
')/2a/92 ID: /92 v
~ -
ENCLOSURE 1 MANAGEMENT MEETING
SUMMARY
On May 19, 1993, representatives from Georgia Power Company (GPC) met with the NRC in the Region II office in Atlanta, Georgia, to discuss operator performance involving the Unit 1 loss of shutdown cooling event on April 14, 1993.
Opening remarks were given by Mr. E W. Merschoff, Director, Division of Reactor Safety, Region II outlining the NRC's concerns and expectations about operator performance during this event.
GPC gave a presentation (Enclosure 2) on the issues. Mr. J. T. Beckham, Jr.,
Vice President, Hatch Project, provided opening remarks and introduced the presentation. The presentation was given by Mr. L. Sumner, General Manager, Hatch, and by Mr. J. D. Heidt, Manager, Nuclear Engineering 'and Licensing.
During the presentation issues were discussed in detail.
Following this,'the NRC closed the meeting.
A list of attendees at the meeting is contained in Enclosure-3.
ENCLOSURE 2 LOSS OF SHUTDOWN COOLING HATCH UNIT 1 MANAGEMENT PRESENTATION TO NRC STAFF H. L. Sumner, Jr General Manager, Plant Hatch l
i
~
4 OVERVIEW
- 1. INITIAL CONDITIONS.
- 2. SEQUENCE OF EVENTS i
- 3. PLANT RESPONSE
- 4. CORRECTIVE ACTIONS TAKEN i
LOSS OF SHUTDOWN COOLING HATCH UNIT l-
=
INITIAL CONDITIONS
- 1. DAY 30 0F 60 DAY OUTAGE.
- 2. CORE RELOAD IN PROGRESS,23 FUEL ASSEMBLIES LOADED, CAVITY FLOODED.
- 3. FUEL POOL COOLING IN SERVICE.
- 4. 'B' LOOP RHR IN SHUTDOWN COOLING.
1
-l LOSS OF SHIRDOWN COOLING HATCH UNIT 1
INITIAL CONDITIONS
- 7. ALTERNATE SYSTEMS AVAILABLE FOR SDC:.
'B' LOOP CORE SPRAY FPC SYSTEM (IN SERVICE)
PSW MAKEUP TO CAVITY DEMIN WATER 4
MAKEUP FROM CST.
CRD SYSTEM a-LOSS OF SHUTDOWN COOLING HATCH UNIT I
Refuelin
- - - - - -, - - - - _ _ _ _ _ _ g Wa t er Level, 52' 7" Above TA F Spent Fuel L)ryer/ Separator -
Pool sii f" REACTOR VESSEL "t*\\!
l sY>oel cnt CAVITY i
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RPV l
. Fuei Storage Racks v-l Natural Circulation Level-
/
l 17' 7" Above TAF Nortnal Level' l
IG' 3" Above TAP CORE l
v i
l Refueling Configuration on April 14,1993
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CONI AINMi.NT -
RHR SYSTEM.- SHUTDOWN COOL. MODE M "' E l
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SEQUENCE OF EVENTS TIME (CDT)
EVENT 0740 Operator confinns that lEll-F015B is open during performance of ECCS status check, and SDC was.
functioning properly.
0745 PCIS mimic board being removed for hardened vent design change. Panel wires inadvertently grounded during removal, fuse blows.
Some electrical arcing is observed by work crew and operator passing by.
The mimic board, being heavy, is quickly laid face down on a special stand provided for the work.
0745+
Valve 1El1-F015B automatically closes.
U RHR pump continues to run but flow decreases to zero (not observed).
0745 - 0910 Loss of SDC went undetected.
Procedure 34GO-OPS-015-IS requires checking SDC flow and other parameters every four hours.
0910 Operator checked SDC flow as required by 34GO-OPS-015-IS and found it to be zero.
i l
i LOSS OF SHUDOWN COOLING HATCH UNIT 1
]
SEQUENCE OF EVENTS TIME (CDT)
EVENT 0910+
Operator checked system alignment and found lEl1-F015B closed.
Operator attempted to open valve using control switch.
Valve cycled open and then closed.
RHR pump 1D was secured.
Fuel movement was stopped.
Loss of SDC procedure was~ entered.
0910-1015 Shift Supervisor initiated actions to get Maintenance to investigate and determme cause of valve closure.
1015 Fuse 1 A71-F22 was found to be blown and was replaced.
1043 Filling and venting of the RHR loop "B" was completed -
and SDC was placed in service.
i i
i LOSS OF SHUrDOWN COOLING HATCH UNIT 1
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PLANT RESPONSE
- 1. The bulk of the fuel remained in the Spent Fuel Pool, cooled by Fuel Pool Cooling.
- 2. The fuel in the vessel remained covered by approximately 52 feet of water.
- 3. There was no detectable increase in reactor coolant-temperature or Spent Fuel Pool temperature.
- 4. The operating RHR pump was not damaged.
LOSS OF S1WrDOWN COOLING HATCH UNTr 1
CORRECTIVE ACTIONS TAKEN An Operating Order was issued stating that the CBO will tour the control room front panels once every hour and will tour the back panels at-least every two hours. (4/16/93)
Training was conducted onLthe event for all Operations personnel on shift-addressing the needLto investigate abnormal occurrences. (4/23/93).
A letter was issued from the Manager of Operations to all Operations-personnel describing two specific plant events (including this event) and reminding personnel of the need to maintain a questioning attituc.e.
(5/3/93)
LOSS OF SHUTDOWN COOLING HATCH UNIT 1
CORRECTIVE ACTIONS TAKEN Placard added to the panel containing the mimic board that reads "When removing this panel to gain access to lights hidden by terminal strip bracket, care should be taken to avoid shorting the lower row oflights to the panel opening."
The operator had the core flow parameter displayed on the front panel that would show a change in core flow if the RHR flow to the i
vessel was isolated.
)
LOSS OF SHUTDOWN COOLING IIATCH UNIT I
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i LOSS OF SHUTDOWN
.)
COOLING l
TECHNICAL / LICENSING ISSUES
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J. D. Heldt Manager, Nuclear Engineering and Licensing i
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INDEPENDENT REVIEW 0F OUTAGE ACTIVITIES OUTAGE ASSES $ MENT OF; DECAY HEAT REMOVAL - WORST CASE CONDITIONS y
-i OUTAGE ASSESSMENT AT TIME OF EVENT CONSIDERATION OF POTENTIAL ACCIDENTS i
9 CONCLUSIONS 6
k y
I P
I 9
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INDEPENDENT REVIEW 0F UNIT 1 REFUELING OUTAGE PERFORMED IN ACCORDANCE WITH NUMARC 91-06
" GUIDELINES FOR INDUSTRY ACTIONS TO ASSESS SHUTDOWN MANAGEMENT" REVIEWS KEY SAFETY FUNCTIONS DURING OUTAGE
+
+
ECCS/ INVENTORY CONTROL
+
POWER AVAILABILITY / SWITCHYARD ACTIVITIES
+
CONTAINMENT
+
OPERATIONS WITH POTENTIAL 0F DRAINING VESSEL
+
REACTIVITY CONTROL REASSESSMENT AS OUTAGE PARAMETERS CHANGE DAILY ASSESSMENT OF SYSTEMS AVAILABILITY
t,
.t.
i INDEPENDENT REVIEW 0F UNIT 1 REFUELING OUTAGE:
(CONTINUED)
COLOR CODES ASSIGNED DURING OUTAGE ACTIVITIES
+ RED
- MINIMAL REDUNDANCY AVAILABLE.
NOT PERMITTED UNLESS THE CONDITION IS-PREVIOUSLY PLANNED AND ALL APPROPRIATE PERSONNEL, INCLUDING PLANT MANAGEMENT, j
ARE INFORMED.
+ YELLOW - ADEQUATE-REDUNDANCY'AVAILABLE...NO SPECIAL ACTIONS. REQUIRED.
LOSS OF REDUNDANCY WILL-GENERALLY PLACE PLANT IN CONDITION OF NO REDUNDANCY.
+ GREEN
- FULL SAFETY ~ SYSTEM AND CONDITION REDUNDANCE r
a
f l
I AVAILABILITY OF CRITICAL SYSTEMS I'
liNIT ONE 3
MAY 11.1993 SYSTEMS AVAILABLE FOR DECAYHEAT REMOVAL NORMAL:
RHR SDCLOOP 'A' CORE SPRAY 'A* & 'B'(ALT SDC)
SYSTEMS AVAILABLEFORINVENTORYCONI1tOL NORMAL:
CRD BACKUP:
RHRLPCI AAB l
CORE SPRAY AAB POWER AVAILABILTIY TO EMERGENCY BUSSES SUTDl; 4160 BUS 10: NORMAL BACK11P SVTCl ED01C 4160 BUS 1F: NORMAL SUID; BACKUP $UTCl IDG1B 4160 BUS IP: NORMAL 5VTD:
BACKUP StJT C ED01A SECONDARY CONTAINLIENT UNIT 1 SBUT A: OPERABLE UhTT 2 SBGT B OPERABLE UNIT 2 SBGT A: OPERABLE UNIT 2 SEGT B: OPERABG,
u,. w OUTAGE ASSESSMENT OF DECAY HEAT REMOVAL k
WORST CASE CONDITION RED l
+
+
RPV HEAD DETENSIONING IN PROGRESS.
+
CORE SPRAY AVAILABLEzFOR LEVEL RESTORATION t
+
RHR SERVICE WATER AVAILABLE (CROSSTIE),- IF.
NEEDED.
j INADVERTENT CLOSURE OF~RHR SHUTDOWNLCOOLING'
+
VALVES DOMINANT FAILURE MODE (99/1361 INDUSTRY-EVENTS)
COMPENSATORY. PRECAUTIONS
+
HEIGHTENED AWARENESS BYLOPERATORS (SPECIFIC ~
TRAINING ON SITUATION AND RECOVERY)
ABNORMAL OPERATING PROCEDURE IN PLACE-a
+
INSTRUMENTATION / ANNUNCIATION
+
NORMAL / ALTERNATE DECAY HEAT REMOVAL
+
DECAY HEAT CURVES l
y
+
AUTOMATIC SAFETY FUNCTIONS l
OUTAGE ASSESSMENT AT TIME OF EVENT CONDITION GREEN
+
REFUELING IN PROGRESS DECAY HEAT LOAD SMALL
+
+
FUEL POOL COOLING AVAILABLE
+
B CS AVAILABLE
+
PSW AVAILABLE
+
TIME TO BOILING APPR0XIMATELY 17 HOURS
+
TIME TO BOIL-0FF APPR0XIMATELY 93 HOURS (ASSUMES NO SDC OR SPENT FUEL P0OL COOLING AND NO MAKE-UP AVAILABLE) i
i
- 6 ENCLOSURE 3 t
LIST OF ATTENDEES o
V. S. NUCLEAR REGULATORY COMMISSION S. D. Ebneter, Regional Administrator, Region II (RII)
E. W. Merschoff, Directoi, Division of Reactor Projects (DRP), RII A. R. Herdt, Chief, Reactor Projects Branch 3, DRP, RII A. F. Gibson, Director, Division of Reactor Safety, RII L. D. Wert, Jr., Senior Resident Inspector, Hatch,-DRP, RII D. A. Seymour, Project Engineer, DRP, RII K. N. Jabbour, Senior Project Manager, Project Directorate II-3, NRR GEORGIA POWER COMPANY J. T. Beckham, Jr., Vice President, Hatch Project H. L. Sumner, General Manager, Hatch J. D. Heidt, Manager, Engineering and Licensing J. C. Lewis, Manager, Operations S. B. Tipps, Manager, Nuclear Safety and Compliance, Hatch E
R s
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s
.