ML23251A013
| ML23251A013 | |
| Person / Time | |
|---|---|
| Issue date: | 08/31/2023 |
| From: | NRC/OCIO |
| To: | - No Known Affiliation |
| Shared Package | |
| ML23251A034 | List: |
| References | |
| FOIA-2023-000163 | |
| Download: ML23251A013 (1) | |
Text
REGULATORY MFORMATION DISTRIBUTION SY EM (RIDS)
'ACCESSION NBR)SSf0230149
DOC ~ DATES 85/10/17 NOTARIZEDS'O DOCKET FAJILi50 Oi0 Nine< Mile'oint Nuclear Station< Unit 2"i Niagara Moha 05000<10 AUTH'AME AUTHOR AFFILIATION MANGANgC~ V.
Niagara Mohawk Powe'r Corp; RECIP,NAMEi RECIPIENT AFFILIATION BUTL'ERg W ~
Licensing Branch 2
SUBJECT!- Forwards proposed rev toFSARtproviding matl in.response to Confirmatory I.tern 20 re'solation of circuits.Rev sh'ovid result-'n closure ofconfirmatory issue 8 will be'ncorporated into future. FSAR amend; DISTRISUTION CODE:
800 ID COPIES RECEIVED:LTR g" ENCL J SIZE:
TITLE", Licensing SUbmittal:
PSAR/FSARE Amdts 8, Related Correspondence NOTES'ECIPIENT ID: CODE'/NAME>>
NRR'/DL'/ADL" NRR LB2'A, INTERNAl: ACRS Of KlO/HDS3 IE'/DEPER/EPB 36'RR'OE'EMRL NRR/OE'/CEB
. ffi NRR/DE/EQB 13",
NRR'/DE/MEB 18 NRR/DE/SAB 2Q NRR/DHFS/HFEBOO.
NRR/DHFS/PSRB NRR/DSI'/AEB 26'RR/OS I/CPB.
10 NRR/DSI/ICSB 1
b'RR/DSI/PSB 19 NRR/DSI/RSB 23 RGNi EXTERNAL, 2AX OMB/OSS (AMDTS)
NRC PDR" 02'NL<
GRUEL'gR COPIFS" LTTR ENCL 1
~
0 1
0 6
6' 0
1' 1
1 1
1 2"
2 1
f>>
f f
1 1
1 1
1 1>>
f 1
1 1
1 1
3 1
1 f,
1>>
1 1<<1 RECIPIENT ID COOK/NAME" NRR'82'C>>
HAUGHEY'gM 01 ADM/LFMB>>
IE, FILE' E'/DQAVT/QA821>>
NRR/DF/AEAB NRR/DE/EHEB.
NRR/DE/GB 28 NRR/DE/MTEB 17 NRR/DK/SGKB 25 NRR/DHFS/LQB 32'RR/DL/SSPB NRR/DSI/ASB NRR/DSI/CSB 09 NRR/DSI/METB 12 NR I/RAB 22'g
/MIB BNL(AMDTS ONlY)
LPDR 03>>
NSIC" 05 COPIES LTTR'NCL>>
1 0.
1 1>>
1 0.
1 1
1 1
1=
0.'
1 2
2>>
1 1-1 1
1 1
1.
0 1
1 1-1 1
1 1
1>
1 1
1 0
1 1
1 1
1 1
TOTAL'UMBER OF 'OPIES REQUIRED!
LTTR 52'NCL
le) r
~I I I r
,I
~
I
~
II J
lf
<<Mruf r
r f f
li,l rf
'il I
CQ f
I'l f I I 1
'l r)r
<<<<)f I f IrllI II I
ruII M
I
<< 'I
~
J tf M
M lu
~
V HIIASAIRA U MQNIA%K
~ e NIAGARAMOHAWKPOWER CORPORATION/300 ERIE BOULEVARDWEST, SYRACUSE, N.Y. 13202/TELEPHONE (315) 474-1511 October 17, 1985 (NMP2L OSiS)
Or. Walter Butler, Chief Licensing Branch No.
2 U.S. Nuclear Regulatory Commission Washington, OC 20555
Dear Dr. Butler:
Re:
Nine Mile Point Unit 2 Docket No. 50-410 Attached is a
proposed revision to the Nine Mile Point Unit 2 Final Safety Analysis Report which provides material in response to Confirmatory Item 20 concerning isolation of circuits.
This material should result in the closure of the Confirmatory Issue.
This change will be incorporated in a future Final Safety Analysis Report amendment.
Very truly yours, TL/rla Attachment 1006G C. V. Manga Senior Vice Pres>dent xc:
R. A. Gramm, NRC Resident Inspector Project File (2) 8gg()P30i+9 8~()g()g10
- - --s~oi~:
R PDQQQ 0
@gal g.
u/
z/g
0 ~
n c
~ 0 Nine Mile Point Unit 2 FSAR QUESTION F421.13 (7.1, 7.2, 7.3, 7.4, 7.5, 7.6)
Various instrumentation and control system circuits in the plant rely on certain devices to provide electrical isolation capability in order to maintain the independence between redundant safety-related circuits and between safety-related circuits and nonsafety-related circuits.
Provide the following information:
(1)
Identify the types of isolation devices which are used as boundaries to isolate nonsafety-related circuits from the safety-related circuits or to isolate redundant safety-related circuits.
(2)
Provide a
summary of the performance characteristics from the purchase specifications for each isolation device identified in response to part (1) above.
(3)
Describe the type of testing that was conducted on the isolation devices to ensure adequate protection against the effects of electromagnetic interference, short-circuit fa'ilures (line to line to ground),
voltage
- faults, and/or surges.
RESPONSE
The following list identifies the types of isolation devices that are'sed to isolate nonsafety-related circuits from the safety-related circuits or to isolate redundant safety-related circuits.
1.
GE optical isolators 2.
Potter and Brumfield MDR relays 3.
Valedyne multiplexers (MC370AD-QZ)
Kam'ari Industries isolation devices a.
KESIMS (serial data line communication isolator) b.
KEI-D (digital isolation module) c.
KEI-A (analog isolation module)
QE(R F421. 13-1 E)RAFT
gl
~ ~
~ p
~ 0 Nine Mile Point Unit 2 FSAR The isolation devices nonessential and essential guidelines of IEEE 384.
devices are employed.
used to electrically separate circuits are designed to the Both relay and optical isolation The optical isolators use a
fiber-optic light pipe to electrically separate the input from the output.
For'xample, an essential logic signal activates a
light emitting diode; the light is transmitted through the light pipe to a
photo switch; and the switch changes state upon receipt of the light signal and-either blocks or transmits.
These are the same types of optical isolators used in other GE plants.
The relay isolation devices provide a
functionally equivalent degree of separation and are used typically for control voltage separation applications, i.e.,
120 V ac and 125 V dc essential to nonessential and redundant essential circuits.
The relays are designed and mounted so that a
metal barrier separates the coil from the contacts with a
minimum distance of 1 in. between the coil and barrier and between the contact and barrier.
The designs of isolation devices are responsive to the concerns regarding susceptibility to noise,
- shorts, surges, and faults.
Adverse conditions affecting the coil or the semiconductor device cannot propagate through the isolation barrier (i.e.,
metal enclosure or fiber-optic light pipe).
Conversely, adverse conditions affecting the contacts or receiving semiconductor cannot propagate through the isolating barrier and affect the coil or transmitting semiconductor.
Therefore, essential systems or circuits are electrically isolated from nonessential and/or redundant, systems or circuits.
QScR F421. 13-2 DRAFT
l~
OO
~ g oe Nine Mile Point Unit 2 FSAR
SUMMARY
OF PURCHASE SPECIFICATION A.
MDR Relay 1.
Design specification a.
MIL-R-19523 b.
Contract specification c.
Coil specification d.
Insulation specification e.
Design life f.
Reliability 2.
Class 1E safety function a.
Functional specification b.
Reliability 3.
Qualification Testing a.
Ambient and design environments b.
Normal mounting B.
Isolator l.
Application Data Specification 2.
Performance Specification 3.
Qualification Testing a.
Tested as a part of panel subassembly The documents listed above are available for review at the General Electric offices in San Jose, CA.
The optical isolator comprises semiconductors, resistors, and capacitors mounted on a
printed circuit board.
As
- designed, this device satisfies electrical isolation requirements.
The Unit 2 NSSS uses two generations of optical isolators to provide isolation/separation between two divisional or QEcR F421. 13-3 DRAFT
OO 0
j'
ine Mile Point Unit 2 POLAR divisional and nondivisional circuits.
The PGCC uses one generation of isolator cards, and the redundant reactivity control system uses a
later generation.
The basic difference is that the later generation has current-limiting resistors on its input circuits to protect the card more fully from damage due to excessive input signals.
Installation in the panels is the same for both generations.
Each is mounted in panel racks designed to hold the input and output cards separated by a 1-in. quartz rod through a
ceramic barrier.
Specifications control the type of testing and qualification required on the isolators.
The basic difference is that.
line-to-line voltage tests (140 V dc for 2 minutes and 400 V
pulse for 1 msec) were performed on the new generation isolators.
Instead of this
- test, an input circuit 5-kV line-to-ground test was performed on the older generation isolators.
In either case, subsequent to the test, it was confirmed that there was no degradation of the card on the other side of the barrier.
Additionally, the RRCS used isolated lamp drivers (card-mounted relays) to isolate Class 1E signals from certain non-Class 1E loads (e.g.,
indicators).
As part of its qualification, a 200 V dc line-to-line test across output contacts was performed to determine no degradation will be propagated back to the input circuit on the card.
Since the same kind of panel enclosures is used for both generations of isolators, running the 5-kV test on the'ld generation will be sufficient to confirm the barrier (dielectric) capability for both generations of isolator cards and their housing.
In addition, since the 5-kV test greatly exceeds, the voltage to be applied during the line-to-line test of the new generation cards, it can be considered equivalent to the test on the new generation cards, with respect to causing detriment to the cards on the other side of the barrier.
The isolator enclosures are designed to hold either four or eight isolator cards; only cards representing circuits from the same division are contained in the same enclosure.
A worse-case failure would only cause loss of function to one division; because of built-in redundancies in other divisions, safety functions would not be lost.
Copies of test plans, procedures, and results are on file at GE.
QE(R F421. 13-4 DRAFT
'f Ci,
Nine Mile Point Unit 2 FSAR A summary of the qualification test performed on the MOR relay and the optical isolators is given in Attachments 1
and 2.
An additional test of the optical isolators to verify that they can withstand the maximum credible fault current/voltage applied in the
'ransverse mode has been performed.
This test demonstrated tht the maximum credible voltage applied to the optical isolators in the transverse mode will not be propagated through the quartz barrier to the other side of the device.
A summary of the test performed on the optical isolator cards is given in Attachment 3.
A summary of the qualification tests performed on the Kaman Industries isolation devices is given in Attachments 4A, B
and C
to guestion 421.13.
Copies of test plans, procedures and results are on file at the NMP2 site.
The Valedyne multiplexer (MC370AO-gZ) is an IEEE-323/344 qualified multiplexing unit connected to a
non-qualified, nonsafety related receiving unit via lengths of 20 to several hundred feet of fiber-optic light pipe.
The fiber-optic light pipe electrically separates the input from the output.
Oue to the inherent design characteristics of fiber-optic light pipe and the physical distance between the multiplexing unit and the receiving unit, the guidelines of IEEE 384 have been met and no additional testing was performed.
O'ER F421.13-5
~l N
e U
ne Mile Point Unit 2 FS R
ATTACHMENT 1 TO QUESTION 421.13
SUMMARY
OF QUALIFICATION TEST PERFORMED ON MDR AUXILIARYRELAY I.
GENERAL Relay Manufacturer:
Relay Model:
GE Drawing:
GE Design Record File:
II.
FUNCTIONAL TEST Potter and Brumfield MDR-4130-1 169C9481 AOO-901-1 The following tests were performed in the sequence listed.
a.
Normal Operation Application of normal coil rating,voltage to coils terminals and observance of relay contact status change.
Repeat test with gradually removing applied voltage.
b.
Contact Current Rating Test Application of contact rated load and observance of contact status change while relay coil energization and deenergization.
c.
Dropout and Pickup Voltage Test Gradual decrease and increase of relay coil voltage application, observance of contact status change.
d.
Response
Time Test Energization and deenergization of relay coil and recording of cycle time.
e.
Dielectric Strength Test Application of appropriate voltage based on Mil Spec R-19523A (1,230 V
for 120 V.ac
- nominal, 2,375 V
for 125 V dc nominal, 1,265 V for 24 V dc nominal) for 1 minute between relay coil circuit and relay main frame.
Amendment 14 QSR F421. 13-6 October 1984 QPP gy
~ 0
/
Mile Point Unit 2 FS Acceptance Criteria - Relay shall not short out between coil circuit and contacts or frame during 1-minute exposure to applied voltage.
f.
Typical Test Setup (see Figure 421.13-1)
III. SEISMIC TEST Clutter and contact bounce monitoring in the energized and deenergized state at different times during seismic excitation.
Rela State NC Contact NO Contact Deenergized at 6.7g Energized at 17g 5 msec max.
No transfer of contact No transfer of contact 2 msec, max.
IV.
ENVIRONMENTAL TEST Exposure to temperature and humidity environment of each extreme and various conditions in between and demonstration of relay operation before,
- during, and after such exposure.
Environmental Exposure oF Relative Humidity 71 55 41 61 81 101 102 119 60 40 20 35 50 65 80 90 V.
CONCLUSION Test samples successfully demonstrated that the relay will function
- before, during, and after the test exposure environment.
The relay met all functional requirements as specified.
Amendment 14 QSR F421.13-7 October 1984
~
I r
ine Mile Point Unit, 2 FSAW ATTACHMENT 2 TO QUESTION 421.13
SUMMARY
OF QUALIFICATION TEST PERFORMED ON OPTICAL ISOLATORS DEVICE Field Contact 5
V Logic Input 12 V Logic Input 5 V Logic Input High Speed Input Analog Input Analog Input Floating Low Level Output High Level Output SV Logic Output High Speed Output Analog Output Isolator Power Supply Optical Isolator Optical Isolator FUNCTIONAL TEST 204B6186AAG004 204B6190AAG003 204B6190AAG004 204B6190AAG005 204B6198AAG002 204B6208AAG002 204B6208AAG003 198B6241AAG003 204B6188AAG002 204B6194AAG002 204B6196AAG002 204B6220AAG002 198B6203AAG004 133D9947G003 133D9947G004 III.
IV.
The optical isolators were tested to verify that they met the requirements as specified in 272A8638, Isolator Application Data Information Document.
SEISMIC TEST The optical isolators were tested using 22A4320 Seismic Qualification Procedure for Class 1E Electrical Equipment Test Specification.
ENVIRONMENTAL EXPOSURE Relative Duration hr 137 153 70+15 (Ambient) 40 80 80 50+15 (Ambient) 80 100 8
12 100 V.
HIGH VOLTAGE TEST A
5-kV hi-pot test was performed on the isolators to ensure that electrical isolation between the input or Amendment 14 QEcR F421. 13-8 October 1984
~ e II I
[
l'
ne Mile Point Unit 2 F
output will not impair the function of devices on the other side of the barrier.
For typical test setup, see Figure 421.13-2 and Figure 421.13-3.
6 VI.
DETERMINATION OF TEST VOLTAGE
'A generic review of the voltage sources present within the plants utilizing optical isolators indicated that 4, 160 volts is the maximum voltage that conceivably could be present.
Therefore, a test voltage source of 5,000 volts was chosen.
The actual voltages that could be present in a panel are determined by a specific plant analysis.
VIII.
CONCLUSION Test samples successfully demonstrated that the optical isolators will function before,
- during, and after the test exposure environment and meet the qualification requirements. of IEEE 323-1971 and IEEE 344-1975't also was demonstrated that electrical isolation is maintained, between input and output.
Amendment 14.
QE(R F421.13-9 October.1984
1 ~
0 ~
Ilf), Fiick,'Q)
I
ine Mile Point Unit 2 FSA&
a
~a ATTACHMENT 421. 13-3 MAXIMUMCREDIBLE VOLTAGE/CURRENT TESTING OF OPTICAL ISOLATOR CARDS 1.
Test Ob ective The purpose of this test was to confirm that, the maximum credible voltage/current can be applied to isolator cards without impairing the function of the cards on the other side of the barrier.
2.
Test Descri tion Eleven different, pairs of input/output isolator cards,
. as shown in Table 421.13-1, were subjected to the maximum credible voltage test.
The isolator assemblies in which the cards were mounted were a
bolted assembly (Figure 421.13-4) and a cast assembly (Figure 421.13-5).
The input values used in the test were as follows:
Source Voltacle'ource Current Ca abilit Branch Fuse Breaker 20 125 VAC 140 VDC 1965 amps
>1600 amps 30 amps 30 amps The testing consisted of applying the maximum ac/dc voltages to one side of the eleven pairs of cards under the following four conditions:
a.
140 VDC on the high side of all input power and signal lines with the isolator assembly grounded.
b.
140 VDC across all signal and power lines (connected in parallel).
c.
Same as Item a except 125 VAC.
d.
Same as Item b except 125 VAC.
The test configurations for each of the four conditions listed above are shown in Figures 421.13-6 through 421.13-9, respectively.
Amendment 20 1 of 2 July 1985
i" 'j", i t
e Mile Point Unit 2 FS ATTACHMENT 421.13-3 (Cont) 3.
Test Results The cards to which the maximum voltage was applied failed (i.e., resistors
- exploded, transistors
- popped, etc) when the maximum voltages were applied across all lines.
The cards did not fail when the voltages were applied relative to case ground.
20 The cards on the opposite side were removed after each test and checked for functional operability.
All cards were found to be operating satisfactorily.
In no case did the arcing, flame, or smoke penetrate the isolator assembly barrier or affect the optical isolator cards on the other side, thus confirming the adequacy of the isolator assemblies and cards.
Amendment 20 2 of 2 July 1985
l'[
a~
tJ X ~'4l
ATTACHMENT 4A TO QUESTION 421.13 Summary of Qualification Test Performed on KESIMS (Serial Data Line Communication Isolator)
I.
GENERAL:
Isolation is achieved by a
dual TTL compatible optical
- isolator, Hewlett-Packard part number HCPL-2630.
Optically coupled isolators allow direct circuit control with complete electrical isolation of input from output.
This isolator is qualified by similarity to the tested sample in Acton Test Report 816435-A.
II.
FUNCTIONAL"TEST:
Functional tests were performed to verify that the KESIMS performs its function as specified in Qualification Report No. 16435-A.
III. SEISMIC TEST:
The KESIMS is seismically qualified by analysis based on the similarity of its components to the components tested under separate reports from Kaman.
IV.
ENVIRONMENTAL EXPOSURE:
All Class lE components of the KESIMS have passed the environmental exposure specified below.
Temperature
('F)
Relative Humidity Duration (Hr) 80 33 33 130 130 78 V.
CONCLUSION:
50 95 15 15 95 50 The test sample successfully demonstrated that the KESIMS will function before,
- during, and after the test exposure environments and meet the qualification requirements of IEEE 323-1974 and IEEE 344-1975.
~
I
, ~
g I
N il ll ll Il 4
'I C
1 I
I L
P P
P il Il
ATTACHMENT 4B TO QUESTION 421.13 Summary of Qual ification Test performed on KEI-DM (Digital Isol ation Module)
I.
GENERAL:
Isolation between the input and output is provided by a relay.
Isolation is provided in that there is no electrical contact between the coil and the contacts of the relay.
The relay is an Aromat flat series relay for printed circuit board mounting with two sets of contacts and a 24 VOC coil.
II.
FUNCTIONAL'TEST:
The following tests were performed on the relay in the sequence listed.
a.
Insulation Resistance Test Test
Description:
The insulation resistance was measured with a
General Radio Megohm Bridge while being subjected to a test voltage of 500 VOC
+ 50 VOC.
The electrification time was one (1) minute prior to each measurement.
The insulation resistance was measured between the connected coil terminals and all connected contact terminals.
Acceptance Criteria:
Insulation resistance should be greater than 10 megohm.
b.
Pull-In Voltage Test Test
Description:
The gradual increase of relay coil voltage until the normally open contacts closed as indicated by the indicating light.
Acceptance Criteria:
Maximum pull-in voltage of 19.2 VOC.
c.
Drop-Out Voltage Test Test
Description:
The test is a gradual decrease of relay coil voltage until the normally closed contacts returned to the closed position as indicated by the indicating light.
lof2
I I
I f
II i
N
OO Acceptance Criteria:
Minimum drop-out voltage of 16.8 VDC.
d.
Contact Resistance Test Test
Description:
The contact resistance was measured using a 24 VDC power supply.
Acceptance Criteria:
The contact resistance should not reach a value where the power dissipated through the contacts impedes the operation of the unit.
A conservatively chosen value of 1
ohm was used.
III. SEISMIC TEST:
Relay chatter was monitored for any chatter which exceeded 2.0 millisecond dur ing the seismic test.
No chatter exceeded the 2.0 millisecond threshold.
IV.
ENVIRONMENTAL"TEST:
During the environmental test.
the relay was energized, and the normally open circuit was attached to a
24 VDC power source and an, indicator light.
The light remained on throughout the environmental test.
Tem erature ('F 80 33 33 130 130 78 Relative Humidity (X 50 95 15 15 95 50 Duration (Hr V.
CONCLUSION:
The tests have demonstrated that the relay will function
- before, during and after the test exposure environment and meet the qualification requirements of IEEE 323-1974 and IEEE 344-1975.
2of2
I I
- 1*I I
8,'
ATTACHMENT 4C TO QUESTION 421.13 OO Summary of Qual if ication Test performed on KEI-AM (Analog Isol ation Module)
I.
GENERAL:
Isolation is achieved by a Linear Isolation Amplifier (Intronics P/N lA184).
In this device, a Class lE D.C. signal is amplified by an integrated circuit operational amplifier, modulated at 25
- KHz, transformed across a
toroidal
- coil, demodulated, and filtered.
Electrical isolation is provided by the coil air gap.
II.
FUNCTIONAL TEST:
The Linear Isolation Amplifier was tested to verify that it performs its function as specified in Qualification Report No. K-84-99V(R).
III. SEISMIC'TEST:
KEI-AM is seismically qualified by analysis based on the similarity of its components to the components tested under different reports from Kaman.
IV.
ENVIRONMENTAL TEST:
All Class lE components of KEI-AM have passed the environmental exposure specified below:
Temperature
'F) 80 33 33 130 130 78 V.
HIGH VOLTAGE TEST:
Relative Humidity 50 95 15 15 95 50 Duration Hr)
A 1.5 KV hi-pot test was performed on the Linear Isolation Amplifier to ensure that electrical isolation between the input or output will not impair the function of the device on the other side of the barrier.
In this test, no isolation breakdown or loss of function was detected in the Intronic Isolation Amplifier.
Additionally, each Linear Isolation Amplifier is tested to 2,500VDC by the manufacturer.
lof2
~0
~a
,1 II l
1 l
VI.
DETERMINATION'F'EST'OLTAGE:
Kaman has reviewed the design of the Analog Isolation Module and concluded that the maximum voltage the isolator may have to withstand is 1500VDC Therefore, a test voltage source of 1500VDC was chosen.
VII. CONCLUSION:
The testing has successfully demonstrated that the Analog Isolation Module will function
- before, during and after the test exposure environment while meeting the qualification requirements of IEEE 323-1974 and IEEE 344-1975.
Additionally, the test demonstrated that electrical isolation is maintained between input and output.
20f2
Pl I
J I
~
r g
t
)It
~
It 4
~
t,
'I It I
t C
k I
I I'
t,llf I
0 e Nin Mile Point Unit 2 FSAR TABLE 421.13-1 ISOIATIOR COMBINATIONS 1.
Field Contact Input/High Level Output 2.
Field Contact Input/5-V Logic Output 3.
Field Contact Input/12-V Logic Output 4.
Field Contact Input/Floating Low Level Output 5.
High Speed Input/High Speed Output 6.
Analog Input/Analog Output 7.
5-V Logic Output/Field Contact Input 8.
12-V Logic Output/Logic Input 9
~
High Speed Output/High Speed Input
- 10. Analog Output/Analog Input ll. Power Supply/Power Supply 20 Amendment 20 1 of 1
July 1985
rl l
+ VOLTAGE
+ VOLTAGE CONTACT 1 MEG OHM COIL 1000 OHM RECORDER RECORDER TYPICALRECORDER CONNECTIONS
+ VOLTAGE RECORDER INITIATING DEVICE RECORDER LOGIC RELAY TYPICALTEST SET-UP FIGURE 421.13-1 TYPICALRECORDER CONNECTIONS AND TEST SET UP NIAGARA MOHAWK POWER CORPORATION NINE MILE POINT-UNIT 2 FINAL SAFETY ANALYSIS REPORT AMENDMENT14 OCTOBER 1984
0 0
ISOLATOR HOUSING WMWWWWMWWWWWWMM~
II II SIG IIIIl RET EWWWWWWMWMWWMWWJ CERAMIC BARRIER IIIII IIIIIII ISOLATOR CARDS
~mmmmm wmmmmmm P wwwwwwwwwww R HI-POT 5KV 2.5 ma FIGURE 421.13-2 TYPICALTEST CONFIGURATION FOR OPTICAL ISOLATORS NIAGARA MOHAWK POWER CORPORATION NINE MILE POINT-UNIT 2 FINAL SAFETY ANALYSIS REPORT OCTOBER 1984 AMENDMENT14
~ 0 0 D w
ISOLATOR HOUSING WWWWWW&WWW&WWWW~I I
I SIG I
IIII RET smmwmmmmmmmmmmm J CERAMIC BARRIER P &W&W&WWWWWW8 I
II ISOLATOR CARDS I
I mIII IIImmmmmmmmmwma FIGURE 421.13-3 TYPICALTEST CONFIGURATION FOR OPTICAL ISOLATORS NIAGARA MOHAWK POWER CORPORATION NINE MILE POINT-UNIT 2 FINAL SAFETY ANALYSIS REPORT AMENDMENT14 OCTOBER 1984
0
~lyQ Vpg kb
FIGURE 421.13-4 ISOLATOR ASSEMBLY (BOLTED)
NIAGARA MOHAWK POWER CORPORATION NINE MILE POINT-UNIT 2 FINAL SAFETY ANALYSIS REPORT AMENDMENT20 JULY 1985
I l i'
FIGURE 421.13-5 ISOLATOR ASSEMBLY (CASTING)
NIAGARA MOHAWK POWER CORPORATION NINE MILE POINT-UNIT 2 FINAL SAFETY ANALYSIS REPORT AMENDMENT20 JULY 1985
C 4
e I
ISOLATOR HOUSING FUSE TEST INPUT FUNCTIONAL OUTPUT SOURCE FIGURE 421.13-6 TYPICALCONFIGURATION NIAGARA MOHAWK POWER CORPORATION NINE MILE POINT-UNIT 2 FINAL SAFETY ANALYSIS REPORT AMENDMENT20 JULY 1985
~
ISOLATOR HOUSING FUSE TEST INPUT FUNCTIONAL OUTPUT SOURCE FIGURE 421.13-7 TYPICALCONFIGURATION NIAGARA MOHAWK POWER CORPORATION NINE MILE POINT-UNIT 2 FINAL SAFETY ANALYSIS REPORT AMENDMENT20 JULY 1985
~ 0
ISOLATOR HOUSING FUNCTIONAL INPUT TEST OUTPUT FUSE S
= STORAGE OSCILLOSCOPE SOURCE FIGURE 421.13-8 TYPICALCONFIGURATION NIAGARA MOHAWK POWER CORPORATION NlNE MILE PolNT-UNlT 2 FINAL SAFETY ANALYSIS REPORT AMENDMENT20 JULY 1985
y 0
~ 0'
ISOLATOR HOUSING FUNCTIONAL INPUT TEST OUTPUT FUSE S
= STORAGE OSCILLOSCOPE SOURCE FIGURE 421.13-9 TYPICALCONFIGURATION NIAGARA MOHAWK POWER CORPORATION NINE MlLE POINT-UNIT 2 FINAL SAFETY ANALYSIS REPORT AMENDMENT20 JULY 1985
E 4
,1 tq