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Novenber 6, 1981

Mr. Darrell G. Eisenhut, DirectorDivision of LicensingOffice of Nuclear Reactor RegulationU. S. Nuclear Regulatory CanmissionWashington, D. C. 20555

Noyy ~ ~Re: Docket No. 50-275

Docket No. 50-323Diablo Canyon Units 1 and 2

Dear Mr. Eisenhut:

In accordance with the NRC Generic Letter 81-10 on Post 'IMIRequirenents for the Emergency Operations Facility (Section III.A.1.2,Upgrade Hnergency Support Facilities) and PGandE letter of April 8, 1981to you, enclosed are the Conceptual Design Descriptions for EmergencyResponse Facility Data Systens and Safety Parameter Display Systen andits associated two systen diagram sketches:

SK-YM1: Emergency Assessment and Response Systen

SK-YM2: Bnergency Response Facilities Data System.

This submittal is intended to essentially satisfy the documentationrequirement on Itens (2) through (6) of Section III.A.1.2.

(1) Task functions of the individuals required to report . ~oito the TSC and EOF upon activation and for each energencyclass. The documentation for this Item was submittedto Mr. Darrell G. Eisenhut (NRR) in a letter on April 8, 1981. /0

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(2) Descriptions of TSC instrumentation, instrument quality,instrument accuracy and reliability.

(3) Descriptions of TSC power supply systems, power supplyquality, reliability and availability, and consequenceof power supply interruption.

(4) Descriptions of the design of the TSC data displaysystems. The description of plant records and dataavailable and record management systems will be submittedlater as a separate submittal.

(5) Descriptions of the data trananission system to beinstalled between the TSC and control rocm.

(6) Description of data to be provided to the EOF.

E6andE will continue to maintain the interim emergency supportfacilities until the final facilities are completed in accordance withIten 2.C(8)p. of Diablo Canyon Unit 1 License.

Kindly acknowledge receipt of this material on the enclosedcopy of this letter and return it to me in the enclosed addressedenvelope.

Very truly yours,

Enclosures

cc(w/enc): Service List

0CONCEPTUAL DESIGN

DIABLO CANYON UNITS 1 AND 2

EMERGENCY RESPONSE FACILITY DATA SYSTEMS

AND~SAFETY PARAMETER DISPLAY SYSTEM

The Emergency Response Facilities (ERFs) are designed to improveresponse and assessment of accident conditions in a nuclear power plant.To perform these functions, the personnel in the ERFs must be supplied withaccurate and timely data on plant conditions.

The necessary plant data will be supplied by two systems: theEmer'gency Assessment. and Response System (EARS) and the Emergency Response

" Facilities Data System (ERFDS). The EARS System monitors and supplies dataspecified in Reg. Guide 1.23 and NUREG-0654 to the ERFs. Reg. Guide 1.23deals with meteorological conditions and is titled "Meteorological Programsin Suoport of Nuclear Power Plants." NUREG-0654, titled "Criteria forPreparation and Evaluation of Radiological Emergency Response Plans andPreparedness in Support of Nuclear Power Plant", deals with monitoringpotential radiation release points at a nuclear power plant. The list ofplant variables input:to the EARS System is«presented.in Table l.

The second system, the ERFDS, will monitor post accident monitoringvariables specified in Reg. Guide 1.97 titled, "Instrumentation for Light-Water-Cooled Nuclear Power Plants to Assess Plant and Environs ConditionsDuring and Following an Accident." The list of variables in this system is shownin Table 2.

Both of the above systems are high quality systems designed to meet the0.01 unavailability goal defined in NUHEG-0696. Both systems generally interfacewith the existing nuclear plant quality instrumentation. Provisions will be made

to allow the addition of new instrumentation as the plant is brought into fullcompliance with Reg. Guide 1.97.

EMERGENCY ASSESSMENT AND RESPONSE SYSTEM DESCRIPTION

The EARS has been designed and sized to address several requirements,including the radiation related portion of NUREG-0696.

EARS consists of three functional subsystems:

Zn ut Data Subs stem

The data acquisition subsystem provides real time radiological andmeteorological input data needed by the central computer for the radiation doseprojection models.

Central Computer Subs stem

This includes the computer, peripherals, and software needed tomanage input and output communications, maintain a data base, and to executethe dose projection models.

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Communications and Dis la Subsstem'his

subsystem includes communications modules, remote computer,color graphics display terminals, and software to support the remote emergencyresponse facilities.

Subs stem Functions

''n ut Data Subs stem

The input data subsystem provides information from fiveprimary sources; primary and backup met towezs, fixed plant radiation andprocess effluent monitois, offsite radiation dose rate monitors,mobile environmental monitoring laboratory, and other mobile instruments.A discussion of the type of data reauired from each source is given below.

Meteorolo ical Tower

Meteorological data of averaged wind speed and winddirection at two elevations, and temperature at the two elevationsare provided from the onsite meteorological tower. The dataaveraging period is fifteen minutes. A backup tower with similarinstrumentation is also accessible under software control to thecentraL computer.

Fixed Plant Monitors

Fifty (50) variables from both Units l and 2 inplantradiation monitoring and process instruments are available tothe Technical Support Center-Computation Center (TSC-CC) computer(see Table l). These signals are provided as isolated analog(4-20 ma) signals to a terminal strip in the cable spreading room.Analog-to-digital conversion and multiplexing will be performedby two independent sets of e~ipment in the cable spreading room.The digital outputs from the muLtiplexers are linked to theTSC-CC computer and the health physics computer. The computer-controlled digital links between the multiplexers and the computersprovide independent 9600-baud digital communications between theseunits.

The second identical multiplexer and communi.cation linkto the RAD Protection Office (RPO) computer provides redundancyof the monitor signals, since these signals are important foremergency radiation dose projections. The digital link from thesecond multiplexer is connected to the health physics computerin the RPO which is normally used for health physics records.Redundancy is enhanced by selection of the same type of computerfor the health physics and TSC-CC applications. Plant aenitordata stored in the health physics computer is also

accessible'y

a 9600-baud digital data link to the Effluent Systems computerin the counting room. Monitor and met data are re~ized to performroutine effluent release calculations.

Offsite Radiation Dose Rate Monitors

The offsite monitoring system consists of twelve low-level gamma dose-rate monitors installed at selected locations atdistances of approximately five to ten miles from the Diablo Canyon Plant.

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In addition, three other units witi'- r:;;smitters, will be

available in the mobile lab, and can e le.t in any desiredlocation. The fixed locations were chosen with a dual purposeof providing measurement stations at population centers, andof including the largest practical number of land based sectorsfrom the site.

The monitors in the system are digitally linked andcontrolled by the TSC-CC computer, and communicate five minuteaveraged readings at 300 baud to the central computer. Thefixed units will be land-line linked to the computer while theportable units are RF-linked.

The monitors have a range of 1~R/hour to 10 R/hourover an incident gamma ray energy range of 50 keV to 3 MeV.

Battery backup for at least ten hours of operation is providedto assure operation in case of loss of AC line power.

Mobile Laborator

The Mobile Lab is an integral part of the emergencyresponse system for Diablo Canyon.

In addition to the analysis capabilities found inexisting radiological environmental mobile labs, this lab hascomputing and color graphic systems, plus radio frequencycommunications capabilities for both technician voice contactand digital data transmission with the EARS comouters.The computer communication link allows the lab, the TSC, andEOF to display the same analytical results and maps withcalculated plume results for discussion by the voicecommunication link. If necessary> the onboard computer canfunction alone as a radioanalytical computation computer.

Other Mobile Monitors

Previous experience during accident airborne releaseshas established the value of data obtained by traversing theplume with various radiation measurement instruments. For theDCPP emergency assessment and response system, provisions areincluded for aircraft flights or ground traverses through theplume with voice communication to the TSC-CC'nd EOF.Measured radiation levels at selected locations can be obtainedas needed to confirm the dose projections of the computer sys'em.

Central Co uter Subs stem

The central computer subsystem is part of an integratedsystem for emergency assessment and response. For effective responseduring an emergency, the computer is configured in a manner to assurethat it will not become overloaded during a demanding emergency situation.Functional requirements for the EARS computer include the following:

1. The computer must have the computing capability in terms ofCPU capability, memory size, processing speed, multi-taskingability, and I/O features needed to execute meteorological modelsfor dose calculations.

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~2. The computer must support color graphics, offer a convenient

graphics language, and provide peripherals for CRT and hard copygraphics output.

-3; The computer must provide at least 40 I/O ports, with each I/O porthaving the capability to handle multiplexer inputs of at least 100analog signals.

4 The computer must offer a load-sharing capability with a similarcomputer. An absolutely redundant system is not xequired; however,the capability to operate the system from backup files and input/outputcircuits must be provided.

5. The computer must be supported by the manufacturex in terms of a formalsystems training program, formal system update procedures.

Communications and Dis la Subs tern

The communications and display systems provide display ofparameters and calculated results to the control xoom, TSC, and EOF.In addition, desk top computers at these locations provide redundancyfor radiation dose calculations should the central computer be unavailable.

Display formats include maps with plume projections, offsitemonitor readings, meteorological data, messages, etc.

The color display systems are raster scan CRT's, withresolution of 400 x 400 or greatex'. Hard copy graphics dumps are providedby dot matrix printers.

EMERGENCY RESPONSE FACILITIES DATA SYSTEM DESCRIPTION

The post-accident monitoring variables specified in Reg. Guide 1.97willbe handled by the Emergency Response Facilities Data System (ERFDS) ~

The system is micro-computer based with distributed processors dedicated tovarious functions.

The system is divided into four subsystems:

Hich S eed Data Ac 'sition Subs stem

Data Handler Subs stem

Data Stora e Subs stem

Dis la Subs stem

Hi h S eed Data Ac isition Subs stem

The data. acquisition subsystem is a high speed, remote multiplexing.system that interfaces with the plant instrumentation, converts the datato a digital form, and then transmits the data to other parts ef''the ERFDS.

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the remote multiplexers between the different Class IE instrument loops andalso between the Class IE instrument loops and the rest of the system. Remotemultiplexers will be located so as to minimize additional wire runs. Each remotemultiplexer has a 12 bi0 A/D converter for high accuracy. The remote multiplexerscan also interface with bi-level signals. The digital information from theremote multiplexers is trans:nitted to master control units which interface withthe data handler subsystem and. the data storage subsystem.

Data Handler Subsystem

The Data Handler Subsystem is made up of two redundant dedicatedprocessors that control data transfer between the data acquisition subsystemand the different processors making up the data display subsystem. The datahandler processors access and transmits only the data requested through the

---4isplay processors. Display data is updated at, one second intervals.

Data Stora e Subs stem

The data storage subsystem receives data from the data acquisitionsubsystem independent of the data handler subsystem. This independenceimproves reliability. This subsystem continuously records all plant variableslisted in Table 2 at one second interval on magnetic tape. The tapes can beused with the TSC or EOF display computers for transient analysis.

Dis la Subs stem

The display subsystem provides the system interface for the operatorsand emergency personnel. The subsystem has independent functional stations inthe TSC, EOF, and control room as described below.

The TSC display equipment includes a display computer dedicated tothe TSC. The computer receives data requests from the TSC personnel throughinteractive terminals, interfaces with the data handler subsystem for thenecessary data, and makes the data available in the TSC. The display computeralso interfaces with a tape recorder to play back data tapes generated by thedata storage system. The peripheral devices for actual data display includean alpha-numeric CRT, graphic plotting CRT with hard cooy output, and a. lineprinter. All of the variables listed in Table 2 will be accessible for displayin the TSC through the display subsystem. The displays will be humanengineered with functional groupings of variables. Available will beparameter magnitudes, trends and time history displays. The TSC will alsoinclude two video monitors slaved to the redundant control room SPDS displays.

The EOF portion of the display subsystem is identical to the TSCdisplay subsystem except for the SPDS. Because of the distance between theSPDS display generators and the EOF, the EOF will have its own redundant SPDSdisplay computers and display generators identical to the control room SPDS.Only data to update displays will be transmitted from the plant to the EOF.

The SPDS equipment includes redundant display computers, videogenerators, color video monitors, and display selector control panels.

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~Each redundant "train" functions independently, and receives data from theredundant data handler computers. The display computers and video generatorswill be located in the TSC. The color video monitors and the display selectorcontrol panels will be located in the control room. Each display computerwill communicate with its respective data handler computer through aRS-232-C serial data li&

The SPDS displays will integrate with the Diablo Canyon. operatingprocedures. Appropriate human factors considerations 'will be used in developingdisplays. Parameter magnitudes and trends willbe part of the displays.

The SPDS equipment in'.the EOF includes redundant display computers,video generators, video montiors, and display control panels. The SPDS

displays available in the EOF are identical to those in the control room.

Power Su 1 to the TSC and EOF

The EARS and ERFDS equipment is powered by a reliable power sourcedesigned so the systems will meet the 0.01 unavailability goal. The EARS

processors will have their own internal uninterruptible power supplies tomaintain programs in core memory during short power interruptions.Xnccming data wouM not be recorded during a power interruption, but thesystem would be able to resume full operation as soon as power was restored.

S stem Availabilit

The EARS and ERFDS will be designed so that the functionalunavailability of each system addresses the unavailability goal of 0.01.The functional unavailability is defined as follows: The system isfunctional and therefore available if all the functions of the system arecapable of being performed. An availability analysis will be performedon both the EARS and the ERFDS Systems.

Verification and Validation

Verification and validation will be performed on both the EARS andERFDS. This will include both hardware and software verification alongwith the necessary final system tests to validate the completed systems.

Radiolo ical Monitorina in the ERFs

Radiation monitoring is provided in the TSC and the EOF. TheTSC has a fixed monitor in each room with continuous indication andalarm capabilities. The ability to distinguish radioiodines at therequired low concentration is provided by a dedicated portable monitor.The EOF will have dedicated portable monitoring equipment. This eauipmentalso will have continuous indication, alarming capabilities, and be ableto detect radioiodines at the required concentrations.

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OOTABLE l

PLANT.VARIABLES TRANSMITTED TO THE EARS

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No. of Signals No. of Signals Common Signalsfor Unit l for Unit 2 for Both Units Si al Name

Containment Area Monitor

Oily Water Separator DischargeMonitor

Containment Air ParticulateMonitor

Containment Radio-Gas Monitor

Plant Vent Gas Monitor

Condenser Air Ejector GasMonitor

Waste System DischargeLiquid Monitor

Gas Decay Tank DischargeMonitor

Steam Generator BlowdownMonitor

Plant Vent Iodine Monitor

Plant Vent Air ParticulateMonitor

Plant Vent Gross Gamma

Monitor

Containment High Range AreaMonitor

Mid-Range Iodine Monitor

Mid-Range Noble Gas Monitor

Plant Vent Sampling AreaMonitor

Iodine Grab Sample AreaMonitor

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OOTABLE I (cont'd.)

PLAVZ VARXABLES TRANSMlTTED TO THE EARS

No. of Signalsfor Unit 1

No. of Signalsfor Unit 2

Common Signalsfor Both Units Si al Name

Plant Vent Flow Rate

Containment Purge Flow Rate

Liquid Waste Discharge FlowRate

Steam Generator BlowdownFlow Rate

Condenser Air Ejector FlowRate

Circulating Water Flow Rate

Oily Water Separator DischargeFlow Rate

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TABLE ZZ

PLANT VARZABLES'RANSMZTTED TO THE ERFDS

No. of SignalsPer Unit Sianal Names

65

RCS Cold Leg Water Temp.

RCS Hot Leg Water Temp.

RCS Pressure

Coze Exit Temperature

Coolant Level in Reactor

Degrees of Subcooling

Containment Sump Water Level

Containment Pressure

Containment Hydrogen Concentration

RHR System Flow

RHR Heat Exchange Outlet Temp.

16 Accumulator Tank Level and Pressure

Boric Acid Charging Flow

Flow in HPZ System

Refueling Water Storage Tank Level

Quench Tank Level

Quench Tank Temperature

Quench Tank Pressure

4

Steam Generator Level

Steam Generator Pressure

Main Steam Flow

Main Feedwater Flow

Auxiliary Feedwater Flow

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TABLE ZZ (cont'd.)

PLANT VARIABLES TRANSMITTED TO THE ERFDS

No. of SignalsPer Unit Si al Names

Condensate Storage Tank Water Level

Heat Removal by the Containment Fan Heat Removal System

Containment Atmosphere Temperature

Makeup Plow-In

Letdown Flow-Out

Volume Control Tank Level

Component Cooling Water Temp. to ESF System

Component Cooling Water Flow to ESF System

38 Status of Standby Power

Condenser Air Ejector Gas Monitor

Containment High Range Area Monitor

64 digitals

79 digitals

4 digitals-

8 digitals

6 digitals

4 digitals

71 diaitals

Plant Vent Zodine Monitor

Plant Vent Gas Monitor

Control Rod Position

Containment Isolation

Accumulator Isolation Valve Position

Reactor Coolant Pumo Status

Primary System Safety Relief Valve Position

Pressurizer Heater Status

Emergency Ventilation Damper Positions

Pressurizer Level

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