ML17174A753
| ML17174A753 | |
| Person / Time | |
|---|---|
| Site: | Dresden, Quad Cities  |
| Issue date: | 06/13/1991 |
| From: | Siegel B Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 9106180044 | |
| Download: ML17174A753 (29) | |
Text
'
l
/~
'\\,
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON. D.C. 20555 Docket Nos. 50-237, 50-249 and 50-254, 50-265
.LICENSEE:
Commonwealth Edison Company June 13, 1991 FACILITY:
Dresden, Units 2 and 3 and Quad Cities, Units 1 and 2
SUBJECT:
SUMMARY
OF MEETING WITH COMMONWEALTH EDISON COMPANY TO DISCUSS COMBUSTIBLE GAS CONTROL FOR DRESDEN AND QUAD CITIES A meeting was held with Commonwealth Edison Compa11y (CECo) on May 20, 1991, at the NRC's office located in Rockville, Maryland.
The objective of the meeting was for CECo to present its proposed pl~nt modifications, at Dresden and Quad Cities, that would result in a purge repressurization system, to control post-accident combustible gas concentrations inside containment, that would comply with the NRC staff's position related to the requirements ~f 10 CFR 50.44.
A list of meeting ~ttendees and handouts are provided as Enclosures 1 and 2, respectively.
J. Able, of CECo, des~ribed the existing combustible gas control systems currently installed at Dresden and Quad Cities and the areas of compliance and non-compliance with the applicable General Design Criteria (GDC).
These systems are currently ustd for containment venting during startup and for containment atmosphere control during normal operation.
CECo's conclusion was that since these systems do not fully comply with the GDC's in the areas of redundancy of controls and features, it would be easier and more economical to convert the existing air-containment atmosphere dilution (ACAD) system to a nitrogen-containment atmospheric dilution (NCAD) system.
The modifications proposed by CECo are very similar to the modifications performed at Cooper Nuclear Station.
This new NCAD system proposed by CECo would utilize the existing two train ACAD system and connect the existing on-site liquid nitrogen system and a new smaller liquid nitrogen system to each of the existing trains.
Two atmospheric vaporizers of sufficient capacity to maintain the oxygen concer1tration below 5 percent using Regulatory Guide 1.7 generation rates would also be installed in each train.
CECo has stated that the proposed ACAD system conversion will result in two redundant safety-grade nitrogen addition systems that meet the requirements of the applicable GDC's.
CECo also stated that the proposal presented represents their preliminary engineering evaluation and that detailed design and engineering will not proceed until the Boiling Water Reactor Owners Group (BWROG) emergency procedure guideline (EPG) concern, related to repressurization (EPG's currently do not address containment repressurization) is resolved with the staff.
CECo stated it would take about 40 weeks to complete the detailed design and about 2 years to procure and install the system.
I
~- -.,**~
J
. Commonwea 1th Edi son Company June 13, 1991 NAME :
The staff stated that additional design details would be required before the staff could write its Safety Evaluation on the design of the proposed NCAO system.
- CECo said the additional information could be provided within approximately 90 to 120 days, after the repressurization issue is resolved.
Although sufficient detail was not provided for the staff to approve the design proposed by CECo, enough information was provided for the staff to endorse, in principle, the approach proposed by CECo to resolve this issue.
Enclosures:
- 1. Meeting Attendees
- 2. Meeting Handouts cc w/enclosures:
See next page DISTRIBUTION Docket File NRC & Local PORs POI II-2 r /f T. Murley/F. Miraglia, 12G18 J. Partlow, 12G18 B. Boger, 13E4 J. Zwolinski, 13H24 B. Siegel L. Olshan A. Chaffee, EAB/llAl OGC, 15B18 E. Jordan, MNBB 3701 B. Grimes, 9A2 J. Kudrick, 801 Original Signed *er.
Byron L. Siegel, Project Manager Project Directorate III-2 Nuclear Reactor Projects - III/IV/V Office of Nuclear Reactor Regulation ACRS(lO), P-315 GPA/PA, 2G5 E. Tana, 12G18 P. O'Dell, 12E4 L. Pl1sco, 12G18 R. Lobel, 17G21 J. Strasma, RIII C. Moore A. Oromerick, 14C7 S. Brown, 11820
- D l~b~~;;h;~-----~
oArE-~a6/(s;/91----=----
- 06/ rz./91
- 06!/J-191
- 06//] /91 OFFICIAL RECORD COPY Document Name:
MEETING WITH CECO
Mr. Thomas J. Kovach Conunonwealth Edison Company cc:
Michael I. Miller, Esq.
Sidley and Austin One First National Plaza Chicago, Illinois 60690 Mr. J. Eenigenburg Plant.Superintendent Dresden Nucl~ar Power Station Rural Route #1 Morris, Illinois 60450 U. S. Nuclear Regulatory Commission
- Resident Inspectors Office Dresden Station Rural Route #1 Morris, Illinois 60450
- Chairman Board of Supervisors of Grundy County Grundy County Courthouse
- Morris, Illinois 60450 Regional Administrator Nuclear Regulatory Commission, Region III 799 Roosevelt Road, Bldg. #4 Glen Ellyn, Illinoi~ 60137 Illinois Department of Nuclear Safety
- Office of Nuclear Facility Safety 1035 Outer Park Drive Springfield, Illinois 62704 Robert Neumann Office of Public Counsel State of Illinois Center 100 W. Randolph Suite 11-300 Chicago, Illinois 60601 Dresden Nuclear Power Station
- Unit Nos. 2 and 3
Mr.. Thomas J. Kovach
- Commonwealth Edi son Company cc:
Mr. Stephen E. Shelton Vice President Iowa-Illinois Gas and Electric Company P. 0. Box 4350 Davenport, Iowa 52808 Michael I. Miller, Esq.
Sidley and Austin One First National Plaza Chicago, Illinois 60690 Mr. Richard Bax Station Manager Quad Cities Nu~lear Power Station 22710 206th Avenue North Cordova, Illinois 61242 Resident Inspector U. S. Nuclear Regulatory Commission 22712 206th Avenue North Cordova, Illinois 61242 Chairman Rock Island County Board
- of Supervisors 1504 3rd Avenue Rock Island County Office Bldg.
Rock Island, Illinois 61201 Illinois Department of Nuclear Safety Office of Nuclear Facility Safety 1035 Outer Park Drive Springfield, Illinois 62704 Regional Admini~trator, Region III U. S. Nuclear Regulatory Commission 799 Roosevelt Road, Bldg. #4 Glen Ellyn, Illinois 60137 Robert Neumann Office of Public Counsel State of Illinois Center 100 W. Randolph Suite 11-300 Chicago, Illinois 60601 Quad Cities Nuclear Power Station Unit Nos. 1 and 2
Name Ed Rowley J. S. Abel Kathleen Brennan Rita Stols Elaine White J. Knubel S. N. Tiwari Darius Depa A. Dromerick R. Barrett Rob Elliott L. N. Olshan B. Siegel John Hannon S. Brown A. Drozo J. Kudrick Conrad McCracken COMBUSTIBLE GAS CONTROL MEETING WITH COMMONWEATLH EDISON COMPANY Affiliation CtCo/BWR Systems Engineering CECo/Engineering and Construction CECo/Engineering and Construction CECo/Nuclear Licensing CECo/Reg Assurance GPUN GPUN IDNS/RxSS NRC/NRR/PDI-4 NRC/NRR/PO I II-2 NRC/NRR/POIII-2 NRC/NRR/POI I I-2 NRC/NRR/POIII-2 NRC/NRR/POIII-3 NRC/NRR/PONP NRC/NRR/SPLB NRC/NRR/SPLB NRC/NRR/SPLB
- e.
ENCLOSURE 1
/.
~
ENCLOSURE 2 COMBUSTIBLE GAS
- CONTROL COMMONWEALTH EDISON COMPANY
. DRESDEN & QUAD CITIES STATIONS
. MAY 20, 1991
I e
MEETING OBJECTIVES
- DESCRIBE OUR EXISTING CAPABILITY FOR COMBUSTIBLE GAS CONTROL.
e DESCRIBE PROPOSED MODIFICATIONS TO ENHANCE OUR ABILITY TO CONTROL CONTAINMENT GAS CONCENTRATIONS.
- OBTAIN NRG CONCURRENCE ON THE PLANNED MODIFICATIONS.
y AGENDA
- . REVIEW THE REGULATION AND LICENSING HISTORY.
- DESCRIBE THE STATUS AT.DRESDEN AND QUAD.
9 DESCRIBE. THE EXIST.ING NITROGEN INJECTION SYSTEMS..
- DISCUSS THE EXISTING SYSTEMS COMPLIANCE
.. WITH THE GENERAL DESIGN CRITERIA.
- DESCRIBE THE PROPOSED NCAD SYSTEM.
- DISCUSS THE NCAD SYSTEMS COMPLIANCE WITH THE GENERA.L DESIGN CRITERIA~
- PURGE SYSTEM IS ACCEPTABLE IF RADIATION DOSE LIMITS ARE MET
- AND DESIGNED IN CONFORMANCE WITH GDC. 41, 42, AND 43.
.
- OTHERWISE, ANOTHER TYPE OF COMBUSTIBL*E GAS CONTROL SYSTEM IN CONFORMANCE WITH G'DC 41, 42, *AND 43 SHALL BE PROVIDED.
GENERAL DESIGN CRITERIA GDC-41 CONTAINMENT ATMOSPHERE CLEANUP CONTROL OF HYDROGEN AND OXYGEN CONCENTRATIONS REDUNDANCY IN COMPONENTS AND FEATURES LEAK DETECTION ISOLATION AND CONTAINMENT CAPABILITIES ACCOMPLISH SAFETY FUNCTION WITH LOSS OF. ONSITE OR OFFSITE POWER ASSUMING A SINGLE FAILURE GDC-42 INSPECTION OF CONTAINMENT ATMOSPHERIC CLEANUP SYSTEM DESIGNED TO PERMIT INSPECTION GDC-43 TESTING OF CONTAINMENT ATMOSPHERIC CLEANUP SYSTEMS.
DESIGNED TO PERMIT PERIODIC TESTING
LICENSING HISTORY 1978 1 OCFR50.44(g) WAS ISSUED.
1981 1 OCFR50.44(c)(3)(ii) WAS ISSUED.
REQUIRED RECOMBINER CAPABILITY FOR UNITS WHICH RELY ON PURGE AND/OR REPRESSURIZATION SYSTEMS AS THE
.PRIMARY MEANS FOR COMBUSTIBLE GAS CON.TROL.
(
1982 NED0-22155 "GENERATION AND MITIGATION OF COMBUSTIBLE GAS. MIXTURES IN INERTED BWR MARK I CONTAINMENTS" WAS PREPARED.
CONCLUSIONS PEAK OXYGEN CONCENTRATIONS ARE LOWER THAN PREDICTED IN REGULATORY GUIDE 1.7.
THE INERTED MARK I CONTAINMENT DESIGN IS *.SUFFICIENT TO MAINTAIN COMBUSTIBLE GAS CONCENTRATIONS BELOW THE LIMITS.
1984 GENERIC LETTER 84-09 WAS ISSUED.
ESTABLISHED CRITERIA FOR ACCEPTANCE OF AN INERTED CONTAINMENT STRUCTURE AS THE PRIMARY METHOD OF COMBUSTIBLE.
GAS CONTROL.
~L".::~~_.!-----~~--::..":'."""_::=--"~~-.:-~~--~-::-::--_-=~~~---"'..:_"='=-~-_:~-'-"---::--**~ =--,=~*~~~-~----~~~=-~ -:.~--~:..~=:::.":.....~-=._-_ ** -.::~~--
LICENSING HISTORY 1984 CECO RESPONDED TO GENERIC LETTER 84-09, INDICATING THAT DRESDEN AND QUAD MET THE CRITERIA ESTABLISHED FOR. ACCEPTANCE OF AN INERTED CONTAINMENT AS THE PRIMARY METHOD OF COMBUSTIBLE GAS CONTROL.
. 1989 THE NRC. ISSUED *A SAFETY EVALUATION OF GE'S METHODOLOGY FOR DETERMINING RATES OF GENERATION OF OXYGEN BY RADIOLYTIC DECOMPOSITION (NED0-22155).
1990 THE NRC* REQUESTED A MEETING WITH CECO TO DISCUSS THE EXISTING CAPABILITY FOR COMBUSTIBLE GAS CONTROL AT DRESDEN AND QUAD CITIES *STATIONS.
e e
- .DRESDEN & QUAD CITIES STATUS COMBUSTIBLE GAS CONTROL SYSTEM*
- COMPLIANCE WITH 10CFR50.44g IS BASED ON AN INERTED CONTAINMENT AND THE GE REPORT (NED0-22155).
.* IN ADDITION, OUR EXISTING NITROGEN
- INJECTION SYSTEMS CAN BE USED FOR
. BEYOND DESIGN BASIS ACCIDENTS, WH.ICH REQUIRE REPRESSURIZATION.
- HOWEVER THESE SYSTEMS ARE NOT FULLY REDUNDANT AND THEREFORE DO NOT COMPLY WITH THE REDUNDANCY
. REQUIREMENT IN GDC 41.
EXISTING NITROGEN INJECTION SYSTEMS
- THE INERTING SYSTEM IS USED FOR INITIAL
. DRYWELL INERTING FOLLOWING EACH OUTAGE.
- THE MAKEUP 'SYSTEM IS USED TO PROVIDE NITROGEN MAKEUP DUE TO LEAKAGE. THIS SYSTEM IS USED THROUGHOUT THE OP.ERATING CYCLE...
- TOGETHER THESE SYSTEMS PROVIDE TWO.
SEPARATE NITROGEN INJECTION PATHS.
l'
lj f;,,
Ii i'I
- J
'I I'
,*I r'
- /
i',,
,ij 11 ii ii Ii I'
I',,
DRVWELL UNIT J.
INERTING
,.. ------6--------~ -----------.---,
I I
I I
I I
I I
I AD I
I
~
I I
I I -e 18" 11/2" NZ VAPORIZER N2 VAPORIZER TANK TRUCK CONNECTIOM Si TANK TRUCK t--C;llQ-..a.,piar--.r-.pi;t-..---------..-.._----C:::CONNECTION UNIT J MAKEUP EXISTING COMBUSTIBLE GAS CONTROL SYSTEMS
- 1
'I r1
/;
ii
'I
- 1
- I
- /
- i
.I if 11
- 1 ii ii I,
!i
'I ii
\\1 il i
I!
i EXISTING INERTING AND MAKEUP SYSTEMS COMPLIANCE WITH THE GENERAL DESIGN CRITERIA GENERAL DESIGN CRITERIA 41 CONTROL OF HYDROGEN AND OXYGEN CONCENTRATIONS REDUNDANCY IN COMPONENTS AND FEATURES
- LEAK DETECTION CAPABILITY ISOLATION AND CONTAINMENT CAPABILITY ACCOMPLISH SAFETY FUNCTION WITH LOSS OF ONSITE OR OFFSITE POWER GENERAL DESIGN CRITERIA 42 DESIGNED TO PERMIT INSPECTION GENERAL DESIGN CRITERIA 43 DESIGNED TO PERMIT PERIODIC TESTING
- POWER IS AVAILABLE FROM EITHER ONSITE OR OFFSITE SOURCES, HOWEVER, THESE SYSTEMS ARE VULNERABLE TO SINGLE ELECTRICAL COMPONENT FAILURES STATUS YES NO NIA YES YES*
YES YES
e e
. EXISTING NITROGEN INJECTION SYSTEMS DESIGN INFORMATION PIPING
>281 F DESIGN TEMPERATURE COMPONENT 125 LBS.
DESIGN
.PRESSURE SEISMIC NO, BUT THE SYSTEM WAS BUILT TO PIPING CODE B31.1.
WE BELIEVE THE SYSTEM COULD BE SEISMICALLY QUALIFIED AS-BUILT..
QUALITY THE CONTAINMENT ISOLATION GROUP VALVES.AND PRESSURE SENSOR ARE SAFETY-RELATED THE OTHER COMPONENTS ARE NON-SAFETY RELATED. THE SYSTEMS ARE ROUTINELY
- OPERATED AND HAVE FEW ACTIVE COMPONENTS.
- EXISTING NITROGEN INJECTION SYSTEMS
. NITROGEN SUPPLY
- A NITROGEN FLOW OF 25 SCFM IS REQUIRED TO MAINTAIN THE OXYGEN CONCENTRATION BELOW 5°/o USING REG. GUIDE.1.7 GENERATION RATES.
SYSTEM MAKEUP INERTING NOMINAL 1 SCFM 2500 SCFM CAPACITY
- PRESSURE...
- ADMINISTRATIVE PROCEDURES REQUIRE_A MINIMUM TANK VOLUME ABOVE THE 2 DAY SUPPLY VOLUME.
- OFFSITE SUPPLY AVAILABLE WITHIN 8 HOURS.
- THERE ARE TANK TRUCK CONNECTIONS AVAILABLE IN THE EVENT OF STORAGE TANK TANK FAILURES.
Ct, e
e EXISTING NITROGEN INJECTION SYSTEM POST LOCA SYSTEM OPERATION
- CONTAINMENT INTEGRITY IS MONITORED BY PRESSURE AND VALVE POSITION INDICATION.
- NO OPERATOR ACTION IS REQUIRED
- SAFETY-RELATED POWER SUPPLY
- CONTAINMENT ATMOSPHERE IS MONITORED BY THE SAFETY RELATED MONITORING SYSTEM (CAM).
- MONITORS HYDROGEN, OXYGEN, AND RADIOACTIVITY
- NO OPERATOR ACTION IS REQUIRED
- SAFETY-RELATED POWER SUP.PLY
- THE NITROGEN INERTING SYSTEM IS AVAILABLE AND MONITORED USING THE CAM SENSORS AND PRESSURE INDICATION.
. - THE OPERATOR INITIATES THE SYSTEM FROM THE CONTROL ROOM
- OPERABLE WITH ONSITE OR OFFSITE POWER, EXCEPT THE HEATING BOILERS WHICH RE.QUIRE ONSITE POWER.
- THE OPERATOR INITIATES THE SYSTEM FROM THE CONTROL ROOM.
- OPERABLE USING ONSITE OR OFFSITE POWER,
. EXCEPT THE VAPORIZERS AT QUAD CITIES.
- a.
e
- e EXISTING NITROGEN INJECTION SYSTEMS.
SUMMARY
- THE EXISTING NITROGEN INJECTION SYSTEMS PROVIDE A METHOD FOR COMBUSTIBLE GAS CONTROL BY NITROGEN INJECTION.
- ALTHOUGH THE SYSTEMS DO NOT FULLY COMPLY WITH THE DESIGN CRITERIA, THEY.
PROVIDE REASONABLE ASSURANCE THAT
C*.
e e
PROPOSED NCAD SYSTEM
,.PROPOSED MODIFICATION
- THE PROPOSED NCAD SYSTEM WILL FULLY
. COMPLY WITH GDC 41, 42, AND 43.
- WE PROPOSE TO CONVERT THE EXISTING AIR-CAD(NOT. IN SERVICE) SYSTEM TO A NITROGEN-CAD SYSTEM BY:
- CONNECTING IT TO OUR EXISTING NITROGEN
- SUPPLY SYSTEM.
- INSTALLING A REDUNDANT-NITROGEN SUPPLY SYSTEM
- INSTALLING ACCUMULATORS ON THE AIR.
OPERATED CONTAINMENT ISOLATION VALVES TO ENSURE VALVE OPERATION IN THE EVENT
- OF A LOSS OF INSTRUMENT IAR.
. - CONVERTING THE FLOW CONTROL VALVES TO ISOLATION VALVES.
. - ELIMINATING THE ACAD COMPRESSORS, AIR RECEIVERS, WITH THE ASSOCIATED PIPING AND INSTRUMENTATION.
- THIS IS EQUIVALENT TO THE MODIFICATION PERFORMED AT COOPER STATION.
1;
!I "
If 11 11 ii ii I,,
- i ii J.,
11 r!
- i I
'j ll
- I,,,,
PROPOSED NCAD SYSTEM * -
COMPLIANCE WITH THE GENERAL DESIGN CRITERIA GENERAL DESIGN CRITERIA 41 STATUS CONTROL OF HYDROGEN AND OXYGEN CONCENTRATIONS YES REDUNDANCY IN COMPONENTS AND FEATURES YES LEAK DETECTION CAPABILITY NIA ISOLATION AND.CONTAINMENT CAPABILITY YES ACCOMPLISH SAFETY FUNCTION WITH LOSS OF ONSITE OR OFFSITE POWER YES GENERAL DESIGN CRITERIA 42 DESIGNED TO PERMIT INSPECTION YES GENERAL DESIGN CRITERIA 43 DESIGNED TO PERMIT PERIODIC TESTING YES
Ct.
.. e
- "PROPOSED NCAD SYSTEM NITROGEN SUPPLY
- TO MAINTAIN THE OXYGEN CONCENTRATION
. BELOW 5°/o USING REG. GUIDE 1.7 GENERATION RATES.
- A 48 HOUR*SUPPLY WILL BE MAINTAINED IN THE EXIS.TING NITROGEN TANK.
- A 24 HOUR REDUNDANT SUPPLY WILL BE MAINTAINED ONSITE.
- OFFSITE SUPPLY IS AVAILABLE WITHIN 8 HOURS.
- THE SYSTEM WILL BE OPERABLE FROM OUTSIDE THE REACTOR BUILDING
If
/;
/!
I i/
TIWNA NNM FROMN2 SUPPlY PROPOSED NCAD SYSTEM TIWNB fCV ti fRQMNZ A
SUPPlY W
(t.
e e
PROPOSED NCAD SYSTEM POST LOCA SYSTEM OPERATION
- CONTAINMENT INTEGRITY IS MONITORED BY PRESSURE AND VALVE POSITION INDICATION.
- NO OPERATOR ACTION IS REQUIRED
- SAFETY-RELATED POWER SUPPLY
- CONTAINMENT ATMOSPHERE IS MONITORED BY THE
. SAFETY RELATED MONITORING SYSTEM (CAM).
- MONITORS.HYDROGEN, OXYGEN, AND RADIOACTIVITY
- NO OPERATOR ACTION IS REQUIRED
- SAFETY-RELATED POWER SUPPLY
'.
- THE NCAD SYSTEM IS AVAILABLE AND MONITORED..
USING THE CAM SENSORS AND PRESSURE INDICATION.
- THE OPERATOR INITIATES THE SYSTEM FROM THE CONTROL ROOM
- THE INJECTION RATE IS CONTROLLED AT THE NCAD CONTROL STATION
- SAFETY-RELATED POWER SUPPLY.
~
. e.
(i t:
- CONCLUSIONS
- WE BELIEVE THAT THE INERTED I
CONTAINMENT SATISFIES THE
- REQUIREMENTS OF 10CFR50.44g AS DOCUMENTED BY THE GE REPORT (NEDO-22155).
- ADDITIONAL CAPABILITY FOR COMBUSTIBLE GAS CONTROL CAN BE PROVIDED BY* THE NITROGEN INJECTION *SYSTEMS.
- WHE*N THE CURRENT *ISSUES ON
- RE.PRESSURIZATION ARE RESOLVED,
- AND THE NRC HAS APPROVED OUR DESIGN, CECO WILL CONVERT THE
- EXISTING ACAD SYSTEM TO AN NCAD SYSTEM.
J *'
UNRESOLVED ISSUE
- THE CURRENT BWROG EMERGENCY PROCEDURE GUIDELINES ARE NOT WRITTEN TO ADDRESS CONTAINMENT REPRESSURIZATION.
- THE BWROG IS CONCERNED THAT PRESSURIZING CONTAINMENT MAY INCREASE THE SEVERITY OF
. OF AN ACCIDENT.
- IN OUR JUDGEMENT, IT IS PRUDENT TO DEFER DETAILED DESIGN UNTIL THIS ISSUE IS RESOLVED.
.e NCAD
SUMMARY
- THE PROPOSED ACAD SYSTEM CONVERSION WILL RESULT IN A SAFETY-GRADE NITROGEN ADDITION SYSTEM MEETING GENERAL DESIGN CRITERIA 41, 42, AND 43.
- WE HAVE COMPLETED PRELIMINARY ENGINEERING TO DETERMINE THE SCOPE OF THE MODIFICATION.
- DETAILED DESIGN AND ENGINEERING WILL PROCEED AFTER RESOLUTION OF BWROG EPG CONCERN WITH REPRESSURIZATION AND NRC CONCURRENCE ON THE SYSTEM DESIGN.
'* ii ii i*
'j,,
ii,,
I Ii 11 IJ II
- 1
- I ii I
I 1j
- 1 I
rj ii ii
'i I
I' !
!I
- I,,
- I "
ii ii
!/
ii
'I
[.
ii
'i ii
'I
,i ii II 1!
COMBUSTIBLE GAS CONTROL PROPOSED 'NCAD
. COOPER STATION N2 SUPPLY 2 TANKS TANK/BOTTLES PIPING SEISMIC SEISMIC VAPORIZER ATMOSPHERIC ELECTRIC W /WATER BATH VALVES AO (WITH ACCUMULATORS)
MOVS POWER SUPPLY SAFETY RELATED SAFETY RELATED
~
.,.