ML19312D866
| ML19312D866 | |
| Person / Time | |
|---|---|
| Site: | Haddam Neck, Millstone File:Connecticut Yankee Atomic Power Co icon.png |
| Issue date: | 04/29/1980 |
| From: | Counsil W CONNECTICUT YANKEE ATOMIC POWER CO., NORTHEAST NUCLEAR ENERGY CO. |
| To: | Ziemann D Office of Nuclear Reactor Regulation |
| References | |
| TASK-03-12, TASK-3-12, TASK-RR NUDOCS 8005050286 | |
| Download: ML19312D866 (9) | |
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s005050 2 8 5 NORTHEAST IFFILFFIES 3
12'!CZZIUT'"
Nafro*[ CONNECTICUT 06101 T)2.00,0ll.207"~
(203) 666-6911 L
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April 29,1980 Docket Nos. 50-213 50-Ph5 Director of Nuclear Reactor Regulation Attn:
Mr. D. L. Ziemann, Chief Operating Reactors Branch #2 U. S. Nuclear Regulatory Commission Washington, D. C.
20555
References:
(1)
D. L. Ziemann letter to W. G. Counsil dated February 15, 1980.
(2)
D. L. Ziemann letter to W. G. Counsil dated March 28, 1980.
(3)
W. G. Counsil letter to D. L. Ziemann dated March 11, 1980.
Gentlemen:
Haddam. ek Plant Millstone Nuclear Power Station, Unit No.1 SEP Topic III-12 Electrical Equipment Environmental Qualification In Reference (1), the NRC Staff transmitted guidance for performing an evaluation of the environmental qualification of Class 1E electrical equip-ment.
In Appendix A to Enclosure 1 of Reference (1), the Staff identified typical systems utilized to perform the necessary functions of emergency reactor shutdown, containment isolation, reactor core cooling, containment and reactor heat removal, and prevention of significant releases of radio-active material to the environment.
Connecticut Yankee Atomic Power Company (CYAPCO) and Northeast Nuclear Energy ComI1ny (NNECO) have reviewed the guidance provided in Reference (1) and have developed Attachments 1 and 2 for the Haddam Neck Plant and Millstone Unit No.1, respectively, to identify plant-specific equipment / functions necessary to achieve the above-identified objectives, during accident a, well as normal conditions.
Although Reference (1) does not require the attached information to be provided until June,1980, it is being documented at this time in tha interest of minimizing questions regarding tl.e determination of what equipment must be envirormentally qualified.
Staff review of the Haddam Neck Plant and Millstone Unit No.1 vill be facilitated by review of the attached material rather than a review of the emergency procedures provided in Reference (3).
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During recent meetings and telephone discussions, the Staff has requested CYAPCO and NNECO to distinguish qualified equipment from unqualified equip.nent in e:nergency procedures. Please be advised that it is not our intention to modify procedures as a result of this review.
It is our intention to color-code or otherwise modify instrumentation on the main control boards to distinguish between environmentally qualified and unqualified instrumentation. We anticipate discussing this point as well as, justifying the adequacy of the attached listir6s during the upcoming j
eite audit.
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Very truly yours, i
CONNECTICUT YANKEE ATOMIC POW 3R COMPANY NORTHEAST NUCLEAR ENERGY COMPANY bf/fL&t)
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W. d.' Counsil Vice President l
Attachment I
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O DOCKE1 NO. 50-213 ATTACHMENT 1 HADDAM NECK PLANf SEP 'IOPIC III-12 ELECTRICAL EQUIPMENT ENVIRONMENTAL QUALIFICATION APRIL,1980
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RESPONSE TO APPENDIX A Typical Equipment / Functions Plant Specific (CY)
From Appendix A Equipment / Functions Engineered Safeguards Actuation Pressurizer pressure transmitters, containment pressure switches and associated 4A/4B lockout relays.
Reactor Protection Reactor Protection System Containment Isolation CY has 39 automatic containment isolation valves which are:
1.
Air Operated Valves 2.
Trip Valves 3.
Flow Control Valves 4.
Motor Operated Valves 5.
Solenoidal Operated Valves 6.
Hand Indicating Control Valve Main Steamline Isolation Main Steamline Isolation System Main Feedwater Shutdown and Isolation The main feedwater shutdown and isolation is performed by:
1.
Main Feedwater Regulation Valves 2.
Back-Up Motor Operated Valves Emergency Power Diesel generators, 4160 V and 480 V switchgear, 125 volt DC system, 120 V vital and semi-vital AC systems, and their associated switchgear, raceway, and cable, i
Raspunne to App:ndix A Pega 2 Emergency Core Cooling Emergency Core Cooling is performed by:
1.
High Pressure Safety Injection 2.
Low Pressure Safety Injection 3.
Charging Pumps 4.
Residual Heat Removal System 5.
Heat Trace System Containment Heat Removal Containment heat removal consists of the following systems:
1.
Air Recirculation System 2.
Adams Filter 3.
Spray System (Back-Up)
Containment Fission Product Removal Filtration System Containment Combustible Gas Control Hydrogen Purge System (Manual System)
Auxiliary Feedwater Auxiliary Feedwater System Containment Ventilation Air Recirculation System, Purge System Containment Radiation Monitoring Containment radiation monitoring consists of the following:
1.
Reactor Containment Air Particulate Monitor 2.
Reactor Containment Gas Monitor C'.ntrol Room Habitability System The control room ventilation and smoke ejection systems.
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Resp nte to Apprndix A Page 3 Ventilation for Areas Containing Safety Equipment Ventilation System Component Cooling Component Cooling System Service Water Service Water System Emergency Shutdown Emergency shutdown is achieved by:
1.
Pressure Control System 2.
Chemical & Volume Control System 4.
Main Steam System 5.
Primary Water Storage System 6.
Nuclear Instrumentation System 7.
Auxiliary Feedwater System 8.
Residual Heat Removal System 9.
Component Cooling System 10.
Service Water System Post Accident Sampling & Monitoring Sampling System Radiation Monitoring Radiation Monitoring System Safety Related Display Instrumentation All instrumentation which displays information used by operators for essential decision making.
JSN/etp 3/12/80 i
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DOCKET NO. 50-245 ATTACINENT 2 MILLSTONE NUCLEAR POWER STATION, UNIT NO.1 SEP TOPIC III-12 ELECTRICAL EQUIPMENT ENVIRONMENTAL QUALIFICATION I
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APRIL, 1980 l
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RESPONSE TO APPENDIX A Typical Equipment / Functions Plant Specific (MP1)
From Appendix A Equipment / Functions t
Engineered Safeguards Actuation The following engineered safeguards systems are considered Category I and are actuated by independent Category I controls which are part of that system:
1.
Emergency core cooling system 2.
Standby liquid control system, manually initiated 3.
Steam flow restrictors (passive system, instrumentation is Category I)
Reactor Protection Reactor protection system Containment Isolation Primary containment isolation system Steamline Isolation Part of primary containment isolation system Main Feedwater Shutdown and MPl utilizes Categozy I check valves to Isolation provide this function Emrgency Power Gas turbine generator, diesel generator, 4,160 and 480 volt switchgear,120 volt vital and instrumnt AC systems,125 volt DC system, and their associated switchgear, raceway and cable Emergency Core Cooling Core spray system Low pressure coolant injection /CTMT cooling system Automatic depressurization system Feedwater coolant injection system Isolation condenser system Containmnt Heat Removal LPCI/ containment cooling system Emrgency service water system Containment Fission Pzoduct Remval Atmospheric control system Standby gas treatment system Containment Combustible Gas Contzol Atmospheric control system (inerting of containment)
Auxiliary Feedwater MP1 does not have an auxiliary feedwater system.
The condensate storage and transfer system provides alternate water for the WCI system l
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2 Containment Ventilation The containment ventilation system is not Categon I at MP1.
It is not required to mitigate the consequences of a wCA or MSLB accident.
(There is nothing in the drywell that requires ventilation for the above.)
Containnent Radiation Monitoring Process radiction monitoring system Control Room Habitability The contzol room heating and ventilation system.
1 Ventilation for Areas Containing The turbine building heating and ventila- ~
Safety Equipment tion system at MP1 is not Category I.
The environments will be determined assuming its failure.
Component Cooling The reactor building closed cooling water system, Rx fuel pool cooling and filter system, secondan) cooling water system Service Water Service water system Emergency Shutdown Shutdown cooling system Isolation condenser system Post Accident Sampling and Area radiation monitoring system.
Moni toring Process radiation monitoring system.
The sample system is not Category I at MPl.
It is isolated by the primary containment isolation system, which is Category I.
Radiation Monitoring Process radiation monitoring system Area radiation monitoring system Safety-Related Display All instrumentation which displays informa-Ins trumentation tion used by operators for essential deci-sion making (as called out in the emergency operating procedures for the LOCA, INP, and MSLB accidents; i.e., level, pressure, tenperature flow indication valve and breaker a
a position, etc.)
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