ML20246L198
| ML20246L198 | |
| Person / Time | |
|---|---|
| Site: | Brunswick  |
| Issue date: | 06/12/1978 |
| From: | Quirk J GENERAL ELECTRIC CO. |
| To: | Parr O Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20246L184 | List: |
| References | |
| JFQ-44-78, MFN-231-78, NUDOCS 8903230313 | |
| Download: ML20246L198 (38) | |
Text
-v NEDC-21617-A l p-uuctsaa susnOy G E N E R A L q,i E L E CT R I C
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PROJsCTS DIVISION GENERAL ELECTRIC COMPANY.175 CURTNER AVE., SAN JOSE. CAUFORNIA 95125 MC 682, (408) 925-2606 l
MFN 231-78 l JFQ 44-78 )
June 12,1978 I 1
l U. S. Nuclear Regulatory Commission '
Division of Project Management Office of Nuclear Reactor Regulation Washington, D.C. 20555 .
Attention: Mr. Olan'O. Parr, Chief Light Water Reactors Branch No.'3 Gentlemen:
1
SUBJECT:
GENERAL ELECTRIC COMPANY LICENSING TOPICAL REPORT NE00-21617, " ANALOG TRANSMITTER / TRIP UNIT SYSTEM FOR ENGINEERED SAFEGUARD SENSOR TRIP INPUT" .
O- As a result of recent telephone conversations with members of the MC staff I am writing to respond to the request for additional informa- ;
tion on the subject report, transmitted with your letter of April 27,
'978. A copy of the two requests is attached. The consensus was that l l
the requests were general in nature and did not lend themselves to i specific replies in support of the report; however, we are pro-viding general responses for use as appropriate.
Request 32.21 asked for information regarding the implementation of desiga Natures which are a part of plant design beyond the scope of the re, sort NEDv 21617. The analog transmitter / trip unit system interfaces with existing designs, and each application will be con-sidered on a case-by-case basis to assure conformance to all appropri-ate required criteria, guides, and regulations. As indicated in the response to your previous request. 032.15, interface data will be supplied, including specific plant interconnections. ,
' Request 32.22 asked for information on qualification of the analog transmitter / trip unit system. Similarly, this information, too, will be Although the equipment will be quali-supplied on a case-by-case fied to IEEE-323-1974, basis.the environmental requirements for each ap tion will be reviewed, and the appropriate required qualification informa-tion will be provided.
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8903230313 890316 PDR ADOCK 05000324 l P PDC
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NEDO-21617-A GENER AL Q ELECTRIC' U. S. Nuclear Regulatory Comission ' ') i Attention: Olan D 'Parr Page 2 June 12,1978 )
I In the previous response to Request 032.20, an incorrect IEEE standard was referenced in regard to. Regulatory Guide 1.118. The hardware as designed and defined in NE00-21617 will meet all the provisions that apply to the instrument sensor by IEEE-338-1975 and Regulatory Guide 1.118, ,
Revision 1. l i
With regard to GESSAR, Chapter 7 contains a description of a Solid-State l
' Safety System. The analog transmitter / trip unit described in the report - ')
I NE00-21617, except for a slight modification (the relay switching devices i will be replaced with integrated circuit switching devices), are utilized The industry standards and the NRC ;
by this Solid-State Safety System. '
regulatory guides, regulations,_and requirements imposed on the instrumen- !
tation and control Class 1 electrical _ safety systems are also imposed on j the analog transmitter / trip unit described by the report NE00-21617.'
j I hope that these assurances will alleviate any concerns which existed ,
j regarding the adequacy of the analog transmitter / trip unit system. 1 l
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VerytrulyyourI.
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(64.J. F. Quirk, Manager l BWR Standardization Safety and Licensing Operation i JFQ: pat /1090,1091 Attachment ,
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' bec: C. L. Hil f J. W. Cleveland L. H. Youngborg S & L Staff
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4 This amendment to the General Electric Company Licensing Topical Report NEDO-21617, " Analog Transmitter / Trip Unit System for Engineered Safeguard Sensor Trip Inputs," is in response to requests for additional information
, enclosed with a letter dated November 8,1977 from Mr. Olan D. Parr, Division of Project Management, USNRC, to the attention to Dr. G. G. Sherwood,
'rianager of Safety and Licensing, General Electric Company, h
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I REQUEST 032.1 -
Verify the correct date for referenced standard IEEE-344. On page 1-2, the 1971 version is referenced and on page 7-3 the 1975 version is referenced.
J Correct this discrepancy.
RESPONSE
f The report will be corrected to indicate IEEE-344-1975. Seismic tests were con- i l
ducted according to IEEE-344-1975 to acceleration levels in excess of the magnitudes The three axes were tested indepen-expected at the hardware mounting locations.
Since dently at low levels to determine if the hardware had any resonances.
All no resonant frequencies were .found, all testing was performed at 33 Hz. * '
the components that are mounted in the logic cabinets (trip units, card files, trip relays, and power supplies) will be retested when seismic tests are per-formed on the assembled cabinet. The tests will also be conducted as per IEEE-344-1975
' REQUEST 032.2A In the section on " General Requirements", provide the system requirements regarding i response time testing, including the sensors.
RESPONSE A Response time testing for the sensors is outside of the scope of) this report.
Response time testing capability is integral to the trip unit calibration system.
The " General Requirements" Section 1.2.2 will be augmented with the following statement: .
The trip unit calibration system shall be capable of introducing a
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positive or negative step of variable amplitude which is used to per-form response time testing of the trip unit and downstream logic
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REQUEST 032.2B In addition, provide the detailed method for periodically determining the response
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time of the trip unit with the transient current source as stated in Section 6.2.2.
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RESPONSE B Figure 1 shws an acceptable connection scheme of an oscilloscope to the trip The following procedure can be used unit in test and the calibration unit.
in response time testing of the trip unit:
- 1. Connect the calibration unit and trip unit to an oscilloscope as shown l in Figure 1.
- 2. Place the trip unit which is to be response time tested into calibration.
3 Set the time base of the oscilloscope to 0.2 millisecond / division.
l 18 . Adjust the stable current pot to full counter-clockwise.
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5 Adjust the transient current so it makes the trip unit trip when it is ~ I I initiated.
Press in the transient current knob. This will initiate the transient s
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7 The oscilloscope trace for preamp number 3 should reach 90% of full scale within 0.1 milliseconds. This verifies the response of the transient test hardware.
- 8. The time delay of the trip unit is the amount of time it takes the signal into preamp number 2 to change state. This time will be about 2 milliseconds.
1 REQUEST 032.2C l
' Describe the method of periodically verifying the response time of the trip relay.
RESPONSE C g;
Refer to Response B. The procedure to test the response of the trip relay is a continuation of the preceding procedure discussed in Response B for A-2 l
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this request:
The positive lead of the trip relay contact is connected to 1.
oscilloscope preamp 4.
- 2. Set the time base of the oscilloscope to 2.0 milliseconds / division.
3 Press the transient test knob. l
- 4. The time delay of the trip unit and trip relay is the amount of time it takes for the signal into preamp number 4 to change state. This= ,
time will be dependent on the contact configuration used as per l
Figure 3-9 of the to'pical' report. The time for the trip. relay to l
change state is the differenoe in time between the change of state of the signals into oscilloscope preamp 2 and 4.
REQUEST 033 3A_
With respect to the master trip units (see Section 1.3.2),, it is stated that there is an " isolated" panel meter. Provide the criteria for when the panel
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meter is required.
l RESPONSE A The meter on the front of the master trip unit monitors the output of the transmitter. The scale readings correspond to the zero and span calibration of the transmitter. Several scale ranges are shown in Figure 1. The process' loops that monitor the same variable such -as vessel pressure for scram may be visually compared and any significant deviations resolved by recalibrating the devices in the instrument loop to eliminate the deviation. The meter is also used during trip unit calibration testing to verify actuation of the calibration relay. Also, when the trip unit is returned to service, the meter verifies that the trip unit is reconnected to the transmitter.
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' REQUEST 033.3B Also describe the isolation provided and whether or not the meter is considered qualified as part of the safety system channel.
RESPONSE B The meter is not considered an integral part of the safety system channel, as it is not in series with the current loop. The meter monitors the normalized voltage at the output of the input buffer amplifier. The normalized voltage varies from 1 to 5 volts for a corresponding transmitter span of 4 to 20 milliamps.
The meter is isolated from the normalized voltage by approximately 4K ohns, which provides isolation from -potential meter failures. Meter failures will .
be detected when the channel visual comparisons are made.
l, REQUEST 032.4 Regarding the trip relays, it is stated that contacts froa these- relays provide f
' the necessary logic function for the process variable input. Verify whether or not relay coil to contact isolation is relied upon at this interface point l
' such that the output of trip relays of one input channel can be sent to other logic divisions. If so, provide the justification for using these devices as " qualified" isolation devices.
RESPONSE
The trip relay provides input into only one division, so it is not considered an interdivision isolation device. The statement that " contacts from these relays provide the necessary. logic function for the process variable input" is interpreted as follows:
Some system inputs require a contact to transfer from open to .
close to provide a trip input. to the logic, while other systems inputs require the opposite configuration (i.e. , close to open contact transfer). The trip relays used have four form C contacts, ;
so the relay will provide any contact logic function that the system requires.
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NEDO-21617-A REQUE3r 032.5A Are the " Calibration Unit" and " Readout Assembly" qualified as part of the .
safety channel equipment?
RESPONSE A The," Calibration Unit" and " Readout Assembly" are not qualified as part of the safety channel equipment as it relates to the trip input to the safety l
logic. However, they were installed into the card file during seismic testing to verify that they would not fail in a manner to make the trip channel inoper-They were also qualified'to operate at elevated able in a seismic event. -
temperature, power supply voltage variation and electromagnetic interference in order to demonstrate that the calibration of the. trip point would be Refer to Tables accurately set under the expected environmental conditions.
4-2, 4-3, and 4-4.
o REQUEST 032.5B_
Does the " Readout Assembly" remain in a channel after the calibration is l
pertorined?
RESPONSE B The " Readout Assembly" will normally be stored in the plant instrument shop.
It is not intended that it is stored in the calibration unit after surveillance testing of the trip units are completed.
1 .
REQUEST 032.6 j
Section 13 7 states that, "In essential safety systems incorporating multichannel logic design, cards can be configured within the files such that it is only Describe the mechanism (s),
possible to calibrate or test ene channel at a time."
interlocks and/or procedures which prevent simultaneous calibration or test.
R ESPONSE The rotary switch on the front of the calibration unit has one position for
-It is not possible each of the 12' card file locations plus an off position. '
to address more than one trip unit at any one time for testing. Access to t A-6 1
l the rotary switch is administrative 1y controlled. The card files for an ECCS ,
system can be configured in such a way as to house all the trips that will. f I
initiate the . system. - It takes the combination of two water level trips and two drywell trips. to initiate an ECCS system, and, since these trip -units for !
these variables sre housed in the same card file, inadvertent initiation of ECCS due to trip unit testing is not possible when the norinal routine test procedures are used.
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REQUEST 032.7_
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With respect to the " Application"'section, provide a list of all plants in ~
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each category which are known. to date. i l
l i, RESPONSE- .I Plants in Phase A Name h ;
Hope Creek 1RfR 4 l Limerick BWR 4 I k~32 Bailly BWR 5 Nine Mile Point 2 BWR 5 j
All except Kuosheng BWR 6
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Plants in Phase B BWR 4 Fermi 2 Plants in Phase C Notes 1
BWR 3 Monticelle .
BWR 4 2 FitzPatrick BWR 4 3 Peachbottom 2 and 3 Notes:
- 1. The hardware application is for vessel pressure and vessel level trips This that provide inputs to the new ATWS recirculation pump trip logic.
system is expected to be installed and operational after the 1978 summer refueling outage.
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- 2. The hardware application is for vessel pressure that provides inputs to the Reactor Protection System. The system is installed and will be placed in operation during a short outage after mid-December 1977.
3 Philadelphia Electric used the hardware discussed in this report for appli-cation of trips into Peachbottom Units 2 and 3 They did their own appli-cation design and installation. The hardware has successfully operated since the restart of the units from their last refueling outages.
REQUEST 032.8 It is not clear from Section 2.1 and 6.1 if the transmitter (or RTD) portion Therefore, if the transmitters of the system is part of the top'ical report scope.
(or RTD) which can be utilized are to be determined for each individual case, then they need to be qualified on a case-by-case basis and the trip system requirements (for the transmitter) should be listed as " interface" information in a separate interface section.
If, however, the transmitter (or RTD's) are to be part of the topical report, then additional specific information is required in the topical report (or in referenced information). The information should include, as a minimum, the manufacture, model number, and qualification information. (See also Q12)
Indicate the intent of the topical report in this area and provide the associated appropriate information.
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RESPONSE
The transmitters which were qualified for essential use are the Rosemount Model 1151 of the following types, gage pressure, absolute pressure and differential pressure. Each transmitter type can be obtained in several different ranges.
Transmitter qualification data are shown in Tables 4-2, 4-3, 4-4, and 4-5 Resistance Temperature Detectors (RTD) sensors have been manufactured for several years. However, a specific model number has not been qualified to When a customer of a BWR purchases operate with a trip unit as of this date.
an analog sensor modification package which includes ambient temperature trips, A-8 i
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NgDO-21617-A r') ;
an RTD will be qualified to operate with the trip unit. i The intent of this topical report is to identify that generically transmitters will be used with the trip units. However, specific interface data such as transmitter type, calibration range and process connections will be shown as l
interface information of appropriate General Electric documents. ;
REQUEST 032.9 Reference is made in the topical report to the " Operations Manual - Trip / Calibration '
System Model 510D4, Rosemount Inc., copyyisht 1976 Instruction Manual 4247-1"
.Therefore, provide copies of this reference materiaf, for additional information.
! RESPONSE lt l' Four copies of the vendor Operations Manual are being provided.
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O REauEST 032.,0-Clarify whether the inverter (125 VDC to 115 VAC) is intended to be part of th'e topical report for all " phase" plants. In addition, provide a uomplete I
list of the loads supplied by the inverter for each design, including any loads 1 outside the topical report scope.
RESPONSE
However, The inverter is part of the topical report for all " phase" plants.
the loads will vary from plant to plant. The plant-unique documentation will show all the loads connected to the inverter.
REQUE.Tf 032.11_
Section 313 considers a " single panel failure" criterion as a basis for not placing " logic A and C" in ene panel (because such a failure could destroy i
A and C, causing a potential failure to scram).
('- With respect to the ECCS cabinet, explain why a similar criterion is not con-s./,
sidered for ADS " logics A and E." It appears that the arrangement of A and A-9
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i E in one panel could result in a " single panel failure", inadvertently actuating !
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ADS or pressure relief. .l i
RESPONSE 032_._11 Section 3 1.3 is in error. RPS separation is dictated by separation requirements. I RPS employs a four-division separation scheme (i.e., four redundant and separate f
Separation requirements necessitate either power supplies and logic channels).
EccS employs a two-division barriered panels per IEEE-384 or separated panels.
separation scheme.
A and E (or, conversely, B and D) are of the same division; therefore, they may be located within the same enclosure.
REQUEST 032.12 Section 3 3 2 on Response time refers to laboratory tests of "the transmit.ters."
l Specifically, state which transmitters (including manufactures, etc.) are included in this statement. (Also see Question No. 8).
RESPONSE
The response time is for a Rosemount transmitter model 1151.
1 ..
l REQUEST 032.13 Indicate the present plans regarding the " turbine control valve fast closure" input (i.e., for all phases indicate if it is to remain a pressure switch, or if it is to be changed to a transmitter trip unit and therefore be part of the topical report scope). .
RESPONSE
The " turbine control valve f ast closure" input will remain a pressure switch for all phase plants. This is because transmitters are not directly adaptable to all turbine manuf acturers for this purpose.
f REQUEST 032.14 With respect to the new selid-state 2-out-of-4 logic systems proposed for recent BWR/6 designs, provide the following information:
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' REQUEST A Address the area of the interface between the trip units and the 2/4 logic.
Is the same type mechanical' trip relay proposed?
RESPONSE A No. Since the output of the trip unit is compatible with the digital logic
~by design, no interface is required. The trip units are connected directly to the solid-state logic.
'/
REQUEST B .
Table 3-1 shows Division 1 panel (H13-P629) for the ECCS trip unit card file
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assignments. Since the other ECCS divisions (2, 3 and 4) are not all identical, I l provide this information for each division.
1 RESPONSE B The table showed Division 1 only for brevity. However, attached are each of the three divisions having card file assignments. Division 1 is updated'from n ~
that of NEDO-21617. Division 4 BWR/6 card files for ECCS exist only in solid-state plants and tables are not yet available. These tables are included in documents unique to each plant.
REQUEST C The logic expression for component availability is given as S (A1 + A2) + (B1 + B2)
(Section 3.4.1). Is this expression correct for plants with the input channels having solid-state 2/4 logic? Provide this information for this group of plants.
RESPONSE C However, l The expression S = ( A1 + A2).(B1 + B2) is not correct for 2/4 logic.
2/4 is more reliable than (1/2) X 2, so the availability analysis of NEDO-21617 need only be concerned with the least reliable of the two logic expressions.
This is consistent with the philosophy of addressing only " worst case" conditions.
See Table 2 on page 29 of IEEE-352-1975 A-11
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REQUEST D
]
General Electric has proposed a pulse test scheme for the solid-state system. -
Describe how this system interfaces with the analog transmitter trip unit system.
RESPONSE D.
Note the following quotation from GE purchase Spec 21A3541 (Rev. 2) Section 4 3 1.8:
"4.3.1.8 Trip Units requiring pulse test option. I 4.3.1.8.1 The trigger for the pulse test will input the printed circuit card
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at pin 13 The trigger input will be a solid-state switch which is closed The width of the pulse will be 0.82 millisecond for application of the test pulse.
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4.3 1.8.2 The pulse test shall make the trip input output change state independent of the analog input and the state of the main trip. .(The gross failure detectors shall not be activated by the pulse test.)
4.3 1.8.3 The time the output is in the changed state shall be equal to the input pulse width. The leading edge of the change of state of the output from the pulse test shall be less than 0.1 millisecond after the leading edge of the trigger pulse."
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NED0-21617-A i
- I R EUEst 032.15
) l In order to provide the effective use of the topical report in the licensing j
reviews of plants referencing the topical report, GE should provide a section which lists the areas (interfees) which must be addressed by- each individual opplicant. As part of this section, the following information, as a minimum, should be indicated in the report as required to be provided by each referencing applicant:
Add (a) The infor9sation of Table 5-1 for the specific plant as implemented.
information regarding the vendor and model of the transmitter utilized and the divisions involved.
(b) The contents of each trip unit cabinet assembly and the associated location of the component parts. l (c) The specific location of each component and a comparison to the data on environmental and seismic qualification presented in the topical. report. . 1 (Note: If the " preferred" location of Section 5.1.4 is not chosen, provide justification for the alternate selection.)
(d) The specific plant information for Figures 5-3, 5-4 and/or 5-5 as applicable.
(e) The plans regarding the " Field Calibration Rack," including design information for this optional item if applicable. ,
RESPONSE
l l
The topical report will be augmented with the following paragraphs which will identify the interf aces between the analog hardware and the specific plant.
5.4 Interfaces Each applicant that uses this topical report as licensing basis must provide application detail of the analog transmitter and trip unit hardware into his '
plant. The following information must be provided by the applicant to the NRC.
s A-26 1
L__--____.___.___
% S.4.1 Specific Instrument Loops Supply information for each instrument loop that will be converted to the analog sensor system as identified below:
(1) Variable name (2) Part number of device being deleted (3) System involved (4) The engineered safeguards division (5) Model number and vendor of the transmitter or RTD.
5.4.2 Trip Unit cabinet l
(
Supply information for each trip un'it cabinet as identified below: ,
<) I (1.4 Cabinet layout showing location areas of the power supplies, trip relays, and trip units.
(2) Division to which the cabinet is assigned.
(3) Layout of each card file in the trip unit cabinet showing the trip variable for each card file slot.,
1 5.4.3 Environmental Interface The environment at each location where the retrofit hardware will be located must be compared to the maximum environment as stated in the topical report for the following factors:
(1) Normal operation and post-accident temperature and humidity.
f 's.
A-27
~
. , _ . - . - . - - - . . - --e.-----~~~---- --
y . - . . .
NEDO-21617-A (2) Comparison of the floor seismic response spectra of the cabinet mounting location for the specific plant to seismic test envelope that the cabinet was tested to.
(3) If the trip unit cabinets are not located in the preferred location as per paragraph 5.1.4, provide justification for the alternate selected Iocation.
5.4.4 Specific Plant Interconnections An interconnection diagram which shows the interconnections between the existing l logic cabinets and instrument cabinets and the new trip unit cabinets is to
' be provided the NRC. The content of the information is to be similar to the The detail of information shown on Figures 5-3, 5-4 and 5-5 as applicable.
interconnection shown on the retrofit elementary and interconnection block diagram should be sufficient.
l 5.4.5 Field Calibration Rack The design and operational information on the " Field Calibration Rack" is to be supplied to the NRC if such a device is purchased and used for transmitter calibration.
l REQUEST 032.16 It is stated in Section 5.1 that, the " retrofit package suggest" changing out Therefore, provide the bases for l a minimum of 90 of the mechanical switches. )
determining those switches which are to be changed out and those which are not recommended for change in each phase plant.
RESPONSE
In Table 5.1 a suggested list of sensors was recommended for retrofit applica- !
tions for the' phase B and C plants. The list may be made shorter or longer based on the customers' experience of the performance of each instrument' type. f The priority of retrofit to the analog system for each sensor should be based on the following considerations: i 1
i A-26 l
l
.j
NEDO-21617-A (1) The likelihood that the calibration of the sensor has a high probability of causing scram if a valving procedure is not performed properly.
(2) History of excessive setpoint drift that generate Licensee Event Reports (LER) due to sensor drif t.
'(3) Is the sensor in a high radiation area?
(4) Is it cot.ginnient to change out the sensor because it is adjacent to a sensor that will be changed out for the new hardware?
(5) Available space in the card file and trip unit cabinet.
(6) Is the installation cost for the sensor worth the benefit that would be obtained from using the new hardware?
l 1
The bases for changing out sensors in the Phase A plants are:
( ) any sensor that is essential and the transient performance requirement (1) is longer than 350 milliseconds, and (2) any sensor that perforus nonessential monitoring functions where high accuracy is desired.
REQUEST 032.17A Section 5.1.1 on the trip unit cabinet assembly describes the separation of the divisional and nondivisional wiring for " Phase C" plants.
Indicate if this separation is adequate to satisfy the separation requirements ' for this
" phase" plant.
i RESPONSE A f
l The separation identified in Section 5.1.1 is considered adequate for plants not committed to Regulatory Guide 1 75. The non-IE wiring is separated from ;
the IE wiring as shown in Figure 5-2. Contact coil isolation plus separate
. l
')
'# fuses in each wire exiting the cabinet will insure that no failure outside A-29 J j
1
- - - - - - - - - - - - - - - _ - _ - _ _ o
NEDO-21617-A the cabinet will propagate into the IE wiring. The contact to coil method of isolation is typically used for IE to non-IE wiring isolation where Regula-tory Guide 1.75 is not applied.
REQUEST 032.17B Also indicate if the same separation is to be utilized to satisfy the separation requirements for other phase plants including those which are to satisfy Regula-tory Guide-1.75 1
. I RESPONSE B Those plants where Regulatory Guide 1.75 is applied will use optical isolation devices that meet the requirements of Regulatory Guide 1.75 II to non-IE isolation and for interdivision isolation.
REQUEST 032.17c ,
In addition, Section 5.1.2 states that two channels may be housed in a single cabinet if suitable barriers are provided. Indicate who specifies the barriers and how they are determined to be " suitable" (i.e. ,- qualified).
RESPONSE C The two channels referenced in Section 5.1.2 are the reactor protection channels \<
l As an example, A1 and B1 may be placed in the same of the same division.
The reactor protection system is housed ccbinet which has two independent bays.
The barrier for the trip unit cabinet may be a in such barriered cabinets.
horizontal barriered cabinet where the Al channel is in the upper half and the B1 channel is in the lower half. The horizontal barrier will be designed similar to the existing barriers used in the current double bay RPS cabinets.
Therefore, the barrier will provide suitable physical separation.
REQUEST 032.18 l
With respect to the equipment qualification, provide. responses to the following items:
I n.
I i
A-30
'.l
j.O a . .e REQUEST A For each component, supply the portion of the specific equipment design specifi-l;.
cation which outlines qualification requirements, the acceptability criteria and requirements, the test plan, test setup, test procedure and test results.
l\
P RESPONSE A Each component within the analog transmitter and trip unit system is required The to ocsply with requirements on General Electric purchase specifications.
following table shows associated reference documents for each component which are auditable from company or vendor files. However, because of the sizable *
- volume of information and the. fact that we desire to maintain 'some control of GE purchased test data, we prefer not to publish this .information in NEDO-21617 The purchase part drawing is the base document which describes all design requirements for the hardware, defines part numbers and references all associated specifications, etc. The general specifications for all essential-However, the transmitter class 1E equipment are documents 225A6634 and 225A6635
' and trip units have additional unique requirements defined by their own individual purchase specifications. i Scme of the reports are quite lengthy. For example, we requested qualification
' summary report 3768A from Rosemount for microfilming in lieu of the formal test report (#127531), which is in excess of 800 pages. '
1
' Qualification data for the transmitters and trip relays in essential application l were already in existence, since these devices are being used in operating plants.
We do not deviate our use of these two devices in NEDO-21617, so further
', review of their qualification should not be necessary as far as the topical report is concerned.
l Although the information you require is voluminous, it can be made available
- As a at your specific request. Please refer to the attached document list.
suggestion, you could transmit your concems and GE would respond by trans-mitting the applicable sections of the documents which address those concerns. f l
l .
1 i A-31 l f 1 i
1
~~p _ ,
L-
v -
NEDO-21617-A Trip Power Trip l Supply Relay j Transmitter Units Inverter Rosemount Topaz Elma Agastat Vendor: Rosemount l
GE Purchase 164c5243 164c5261 164c5258 l Part Drawing: 169C8393 164c5150 l GE Purchase 225A6635 225A6635 225A6635 Specification: 249A1945 21A3541 GE Qualification 21A3541 225A6634 225A6634 225A6634 Specification: 225A6634 GE Environmental 22A3093 22A3093 22A3093 22A3074 Specification: 22A3093 9
Environmental 30592 4037-FETP QIP-GP2 Test Plan: 117415 '6753c Environmental 30592 4037-TDS QTR-GP 2 Test Results: 117415 3768A l
GE Seisnic 164c5243 164c5261 164c5258 Specification: 249A1945 21A3541 Seismic 751296-1 grP-GP1 117415 6753c 30592 Test Plan: .
Seismic 30592 58059 QTR-GP1 Test Results: 117415 3768A GE EMI 249A1238 None 249A1238 249A1238 Specification: 249A1238 EMI 4037-EST None 249A1238 6753c 30592-1 Test Plan:
DiI None Test Results: 330482 3768A 30592 4037y
't
^
- REQUEST B It is stated that the electromagnetic interf ace susceptibility tests for the equipment were established as a result of worst-case transient and radio Therefore, provide the f requency conditions measurted in actual field tests.
basis for utilizing this approach in lieu of established industry standards (M/L Std 461 A and 462).
RESPONSE B The EMI tests for NEDO-21617 equipment were based on GE spech cation 249A1238 as indicated in the pravious table. This specification was originally issued in 1973 following extensive research in identifying transients generated within '
nuclear power plants. It has been considered an acceptable test basis for EMI qualification of esscatial nuclear control and instrumentation equipment since 1973 Mil-Std-461A and 462 were originally reviewed as part of this research effort, j
and it was felt inappropriate to nuclear application for the following reasons: '
As implied in Section 4.1 3 3 and Table 1 of 461 A, the standard appears 1.
EMI l to be oriented toward aircraft and other tactical military vehicles.
measured within the nuclear plant environment exhibited different character- l For example, 461A exhibits unipolar
- istics from that identified within 461 A.
pulses, but those found in nuclear plant studies were bipolar.
. 2. Voltage impedance levels are not adequately specified in 461A.
3 IEEE' recognizes inadequacy of 461 A to power plant systems as indicated, for example, by their adoption of ANSI Standard C37-90s,1974, for use However, this standard with protective relaying equipment in substations.
- was not issued in 1973 l
. REQUEST C For al'. qualifications tests, including the EMI tests, clearly define the accep-tance criteria for the equipment needed.
} ,
- i. U A-33
NEDO-21617-A RESPONSE C Each of the specifications listed in Table 1 require that no malfunction, undesired response, degradation of performance or permanent damage to the instrument shall occur when it is subjected to the conditions defined by said These conditions specifications as appropriate to the module being tested.
are identified throughout Section 4 of NEDO-21617 t
REQUEST 032.19_
For conformance to Section 4.9 of IEEE-279-1971 " Sensor Checks," it is stated -
that this requirement is met by channel crosschecking and surveillance testing.
With respect to crosschecking,. define the specific time interval associated with "once per operating cycle." Also, describe the specific tests (i.e. ,
calibration, response time transmitter seal integrity, etc.) performed as part of the surveillance test.
RESPONSE
Each transmitter trip unit sensor loop has a meter counted on the front of Most the master trip unit that monitors the output of the transmitter.
process trip inputs to the safety systems are monitored by more than one inde-In systems where the same pendent reactcr vessel pressure trip channel.
i variable is monitored by more than one independent channel, the meter readings are recorded and are compared to each other. The frequency that this task is peiformed is consistent with all light water reactors using similar trip system design.
The transmitters are calibrated once per operating cycle when the reactor is out of service for refueling. The operating cycle time is dependent on the reload fuel design, which can be between 12 and 18 months.
This calibration frequency is typical for light water reactors that use similar analog trip l
systems with the capability of interchannel comparison using meter indication.
The following tests are perfonned on each transmitter when it is removed from service for calibration:
(1) zero and span are set; A-34 I
NEDO-21617-A 4 I
. i L
1 (2) linearity of output current to input pressure is measured;
[
(3) high and low gross failure trip points on the master trip unit are set; f
. (4) transmitter seal integrity are observed when the transmitter is pressurized i
\ ,
for adjustments of zero and span; and 1
\
(5) response time verification will be conducted according to the procedures of the EPRI report NP-267, " Sensor Response Time Verification."
's REQUEST 032.20_
In Section 7 2 for "NRC Regulatory Guides", provide your conformance to the l 1.100, applicable portions of the following additional Regulatory Guides:
f 1.105 and 1.118.
l j
. RESPONSE R.G.1.100 - Refer to Response to Request 032.1 and Section 7.1.6.
R.G. 1.105 - Intrinsically, after random failures, electronic modules will f
not drift at the rate of mechanical devices (such as blind pressure switches), and significant abnormalities are indicated by the The l I gross failure alarm as indicated in Sections 3 2.2 and 3 2.3 trip units are designed to receive a 4-20 mA transmitter signal and The l provide an output at a specific (+ tolerance) input signal.
/ The setpoint
/ modoles are selected such that that requirement is met.
3 I ;
recommendation of R.G.1.105 is not considered applicable to these devices, i
R.G. 1.118 - IEEE-338-1975 will be applied at the system level since the units ~
Com-described herein are simply elements of the total system.
pliance will be discussed at the system level in each applicant's
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A-35/A-36 i; .
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