ML20205M968
| ML20205M968 | |
| Person / Time | |
|---|---|
| Site: | 05000131 |
| Issue date: | 04/05/1999 |
| From: | DEPT. OF VETERANS AFFAIRS MEDICAL CENTER, OMAHA |
| To: | |
| Shared Package | |
| ML20205M954 | List: |
| References | |
| NUDOCS 9904160112 | |
| Download: ML20205M968 (26) | |
Text
i O
ATTACHMENT #1 O
O gem =;;,c
AdditionalInformation Submitted for the Amendment C
of Facility License No. R-57
(
Omaha Department of Veterans Affairs Niedical Center 1.
Verification and validation plan for GA N1odel NNI 1000 Neutron N1onitoring System.
A.
The complete reactor control console will not be replaced, only the neutron monitoring l
system for the linear, log and period. The power supply and pre-amplified (A) and computer modules (B)are mounted on the wall behind the console (see Fig 1). The Burr-Brown TN176 Ntictoterminal C and the Period (D) and Power (E) Bargraphs are
]
located on the original console (Fig.1). When changeover occurs the new Westronic Recorder (F) will replace the old recorder presently installed in the console. Terminal Display items for the N1icroterminal are described in Attachment 1.
B.
Scram Verification " Item" notation refers to pressing key on microterminal(See Attachment I for Reference) 1.
Individually test the trip relays in the NNt 1000 with a meter while they are isolated from the TRIGA console to assure that they are operating properly while they are put through the tests outlined below. Relay connections shown in Fig.
- 2. Location of cards shown in Figures 3 & 4.
a.
Power Level Trip. Relay-Board A3, Pins 8&9.
(1) lli level - push " Power Scram Test" button on console.
(a) lli Level Trip.
(]j
/
(b)
Item 41, Press F8 key (this puts you in Data Entry N1 ode)
(c)
Enter 1.0E+02 and then press enter key. This sets scram j
at 100%.
(d)
Verity that A2 light is on.
(e)
Item 15 - Verify that read out shows 11 for liigh.
b.
Period Trip. Relay-Board A2, Pins 8&9.
(1)
Item 43, Press F8 key (this puts you into Data Entry Ntode).
(2)
Enter 7 for 7 seconds and then press enter key. Once this value is entered it should not be changed.
(3)
Item 50, Press F8 key, Enter 5 (Campbelling liigh Test).
(4)
The above should cause a momentary high positive period and activate the period trip.
(5)
Verify that light A2 is on and Item 15 show a read out of R for rate.
c.
liigh Voltage Trip. (Loss ofliigh Voltage) Relay Board A3, Pins 8&9.
(1)
Push "fligh Voltage Test" button on console.
(2)
Verify that A2 light is on.
(3)
Item 60, Verify that Burr-Brown readout shows 10/ CXillV.
(4)
Item 61-69 until readout shows empty (this assures that there are no other errors.
d.
Startup Channel (Low Level Trip) Relay Board A3, Pins 2&3.
(1)
Item 40, Press F8 key (this puts you into " Data Entry Ntode")
(2)
Enter 3.74E 07. This corresponds to 2 counts /sec (1.87E-7 = 1 sec).
5 (3)
Item 10.
4-1
e (4)
Remove neutron source, f
(5)
Verify that light A2 goes on when Burr-Brown readout shows
\\
3.7E-7 and item 15 shows a read out of L for low level trip.
Watchdog Timer Relay Board A3, Pins 8&9.
e.
(1)
Disconnect plug labeled A3 CTX (card in position 4 in microprocessor card box).
(2)
Green light on 10 and Memory Card (Card in position 9 in microprocessor card box) should go off and yellow light on.
(3)
Verify that light AI is on and item 60 shows 02 CXFAIL.
2.
When the operation of all scrams have been verilled with the unit disconnected from the existing system, connect the relays in the NNI 1000 microprocessor assembly to pug 3B in the TRIGA Console as show in Fig. 2 and raise control rod for each test.
Repeat the procedures outlined in Paragraph I.B.1 above without a.
voltmeter, since control rod will drop signifying operation of relay.
b.
Do not proceed with installation unless all scrams are operating properly.
C.
The NN1 1000 Neutron Ntonitoring System has been installed in parallel with our existing system since October 1989,(scram relays not connected and reactor completely controlled with our existing licensed system) and the only major problem that we have had was a noisy fission chamber resulting in too high of a count rate when the neutron I
source was removed. This problem was resolved by replacing the high voltage power supply and assuring that the system was adequately grounded. Critical calibration values as described in paragraph IV below have been recorded each time the reactor is operated since October 1989, and all values have varied less than 5% of the contigured values.
D.
Scram Response Time s'
l.
Since the scram relays in the NNI 1000 are connected te the original TRIGA Ntark I control console, the response time testing will utilize the same procedure as previously used.
2.
Raise a control rod and measure the scram time with a stop watch. Compare the scram time with the scram time previously determined befbre the NN11000 was connected.
3.
In accordance with Paragraph 3.3.1 of our Technical Specilications,"The maximum scram time for any fully withdrawn rod shall be 2 seconds from the time ofinitiation of scram signal to full insertion of the rod."
E.
Sensitivity of Detector (Calibration) 1.
Before replacing the neutron monitoring system in the old console the following procedure will be followed: (The complete procedure described below was done on August 13,1990, and all values have agreed since then. Ilowever, the procedure will be repeated prior to switching over systems with the exception that the thermal calibration will be done after we have removed the linear ion chamber from its aluminum tube guide that is attached to the ion chamber mounting ring and inserted the new fission counter).
a.
Place the new Reuter Stokes fission chamber as close to the original linear compensated ion chamber as possible.
b.
Align the fission chamber as outlined in Attachment 2.
c.
Thermally power calibrate the reactor as per existing SOP and axially move the linear, tog and per cent power ion chambers so that their output devices read the calibrated power (linear and log on old recorder).
4-2
d.
Axially move the new fission counter so that the new linear recorder reads the calibrated per cent power.
Verify that the new log recorder is also reading the calibrated value.
e.
f.
Verify that the ion chamber readings compare with the fission chamber readings.
11.
Loss of high voltage to neutron detector scram function.
A.
Original System - Per Cent Power Chamber 1.
The original per cent power ion chamber and scram circuit will be used as our second detector and consequently there has been no change made in the loss of high voltage scram function.
B.
New NM 1000 system.
1.
Loss ofIligh Voltage to the new fission counter activates Relay A3 in the NM 1000 assembly which is hard-wired to the per cent power scram in the TRIGA console (Fig. 2). The system then scrams as in the original system.
Ill.
Location and installation configuration for the new instrumentation and control system - See Fig.l.
A.
Specification of the temperature and humidity conditions of the system.
1.
The NM 1000 was tested to the following extreme conditions and found to operate satisfactorily.
a.
Tempecature: 0-600C.
b.
Relative humidity: 0-98%
2.
The Omaha V.A. TRIGA is installed in an air-conditioned humidity controlled room.
B.
Evaluation of enclosures, cabinets and connections to building structures for general ruggedness under potential dynamic conditions.
1.
System was tested to meet the requirements oflEEE 344-1975.
2.
Preamplifier and microprocessor assembly enclosures are mounted on basement cement wall (Fig. I, A & B) and hard wiring to TRIGA console is done through conduit (Fig.1, G).
C.
Evaluation of potential contact chatter during dynamic conditions.
1.
All relays are normally energized and do not chatter under postulated seismic acceleration.
2.
The system is designed to scram on potential contact chatter conditions.
D.
Evaluation of cable and component shielding, configuration and/or isolation to mitigate the consequences of electro-magnetic interference (EMI).
1.
Signal outputs are either OPTO or transformer isolated, inter-connection is via twisted shielded pairs.
2.
EMI levels sufficient to cause a response would cause a transient upscale response. If transient upscale response exceeded 100%, scram would occur.
E.
Evaluation of power supply buffers to mitigate power transient effects.
1.
Power supplies are electronically regulated and input power is buffered by a shielded passive line filter followed by a shielded active tracking filter. All are enclosed within a steel NEMA 1 enclosure.
2.
After a power loss the surveillance program described in paragraph 4 of this document will be repeated. This is the same program used each day before p
starting up the reactor.
(
F.
Evaluation of instrument isolation devices.
4-3
1.
For the analog outputs isolation is provided by an " Analog Devices" isolation converter. Analog Devices rates the input to output isolation at 1500 V RhtS.
The device meets the IEEE Standard for Transient Voltage Protection (472-1974: Surge Withstand Capability) and offers reliable operation over -250 to
+850C temperature range.
2.
Trip outputs are provided by relay contacts. The isolation ratings are not supplied by the manufacturer.
3.
Isolation for communication is provided by optical isolation. General Atomic has tested the isolation of these optical isolators to 120V A.C.
4.
hiechanical isolation is provided at the field termination points for all safety and non safety inputs and outputs l
IV.
hiaintenance and surveillance program.
A.
At the start of each working day or after each major interruption of operation, the reactor electrical and mechanical systems shall be checked out and certified to being proper l
working order, in accordance with the check list shown in our existing SOP.
B.
When the Nh11000 is installed the Chamber and Instrument Sensitivity section of the SOP will be replaced with the checks described in Attachment 3.
C.
hiaintenance will be performed on any of the items in the Daily Checklist which cannot l
te verified; so that the facility is in compliance with the cur-:nt Technical l
Specifications.
l V.
Operator training for the new system (outline listed below).
A.
Description and theory of fission counter.
I.
Discrete neutron counting techniques.
2.
Campbelling techniques.
B.
General Description of NN11000.
1.
Physical Description.
I 2.
Performance specifications.
3.
Amplifier Assembly.
4.
Signal Process Assembly.
5.
Installation and Setup - Calibration.
C.
Functional Description.
1.
General.
2.
Source Range Log Count Rate.
3.
Wide-Range Log Power.
4.
Power Range.
5.
hfultirange Linear Power.
D.
System Description.
1.
Hardware.
I 2.
Sot 1 ware.
E.
Nhl 1000 Software Description.
1.
Hardware / Software Description.
2.
NN11000 System Function.
3.
Software Organization:
a.
CPU Reset.
b.
Counterffransmitter hiessage Character Received, c.
Local Display Input Character Received.
d.
Local Display Output Character Sent.
4.
Database Organization.
4-4
f Database item Description.
a.
f b.
Error Description.
\\
c.
Daily Checklist.
VI.
Hardwiring of NN1 100 trip output to TRIGA Control Unit.
A.
The relay outputs of the NM 1000 as described in paragraph I B above are connected to plug 3B of the Contro! Unit of the TRIGA Console. Connections are shown in Fig. 2 and Fig. 7-2 attached. (Please substitute the enclosed Fig. 7-2 for our original submission.)
B.
Connection is through conduit G, Fig.1.
t l
Vll.
Figure 7.2 (see revised Fig. attached) Replace Fig. 7-2 submitted October 1989.
j A.
Connections of V/F out on J2AI to counter transmitter Ji A1 (drawing 0387 60820) to E3 to Ul-4 to UI-9 to UI-2 of counter I (drawing 0387 60820). Drawings are in GA Operations and Ntaintenance N1anual El17-1000.
l.
The connection between the V/F Convertor and Counter I has been made on revised Fig. 7-2.
B.
We do not have remote display unit so it has been deleted on the diagram.
I C.
The calibration generator uses the summation of the outputs of a multi-frequer.cy digital l
clock to produce a pseudo-square wave in the Campbelling region. The calibration values are adjustable and stability is determined by power supply and passive component drift. In count rate mode discrete frequencies are counted and stability is determined by the clock crystal. Function switching is performed by transistor switches controlled by the counter transmitter which is in turn software controlled. If a calibration function is selected w hen at power a rod withdrawal prohibit function operates, except in high g
Campbell calibration which causes a scram.
4 Vill.
Proposed Technical Specification Changes - Watchdog Timer.
A.
See revision to Table 3-1 (page 7) and page 8 (Attachment 4 & 5).
4 B.
See revision to page 7-6 (Table 7.1) of proposed Amendment No.1, SER (Attachment
{
6).
C.
Please substitute the enclosed Attachments 4,5 and 6 for the corresponding pages submitted in October 1990.
IX.
Niinimum count rate rod withdrawal interlock.
A.
The minimum count rate withdrawal interlock was set for 10 counts per second in our October 1990 request due to the fact that the noise level of the detector was high.
However, since the original request for change was submitted the noise has been eliminated. Consequently, we request that 10 counts per second be deleted and replaced with the original licensed limit of 2 counts per second (Attachments 4 and 6).
C i
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AdditionalInformation Submitted for the Amendment of Facility License No. R 57
(
Omaha Department of Veterans Affairs Medical Center 4-2
i i
I l.
Verification and validation plan for GA Niodel NM 1000 Neutron Ntonitoring System.
i
\\
A.
The complete reactor control console will not be replaced, only the neutron monitormg system for the linear, tog and period. Tha power supply and pre-amplilled (A) and computer modules (B) are mounted on the wall behind the console (see Fig 1). The Burr-Brown TN176 Niicroterminal 0 and the Period (D) and Power (E) Bargraphs are located on the original console (Fig.1). When changeover occurs the new Westronic Recorder (F) will replace the old recorder presently installed in the console. Terminal Display items for the Niicroterminal are described in Attachment 1.
B.
Scram Verification " Item" notation refers to pressing key on microterminal(See Attachr ent I for Reference)
{
l.
Individually test the trip relay; in the NN1 1000 with a meter while they are isolated from the TRIGA console to assure that they are operating properly while they are put through the tests outlined below. Relay connections shown in Fig.
- 2. Location of cards shown in Figures 3 & 4.
a.
Power Level Trip. Relay-Board A3, Pins 8&9.
(1)
Hi level - push " Power Scram Test" button on console.
(a)
Hi Level Trip.
i (b)
Item 41, Press F8 key (this puts you in Data Entry l
htode)
)
(c)
Enter 1.0E+02 and then press enter key. This sets scram 1
at 100%.
p (d)
Verity that A2 light is on.
\\
(e)
Item 15 - Verify that read out shows H for High.
b.
Period Trip. Relay-Board A2, Pins 8&9.
i (1)
Item 43, Press F8 key (this puts you into Data Entry N! ode).
(2)
Enter 7 for 7 seconds and then press enter key. Once this value is entered it should not be changed.
)
(3)
Item 50, Press F8 key, Enter 5 (Campbelling High Test).
1 (4)
The above should cause a momentary high positive period and activate the period trip.
(5)
Verify that light A2 is on and Item 15 show a read out of R for
)
rate.
c.
liigh Voltage Trip. (Loss of High Voltage) Relay Board A3, Pins S&9.
(1)
Push "High Voltage Test" button on console.
(2)
Verify that A2 light is on.
(3)
Item 60, Verify that Burr-Brown readout shows 10/ CXHIV.
(4)
Item 61-69 until readout shows empty (this assures that there are no other errors.
d.
Startup Channel (Low Level Trip) Relay Board A3, P. ins 2&3.
1 (1)
Item 40, Press F8 key (this puts you into " Data Entry Ntode")
(2)
Enter 3.74E-07. This corresponds to 2 counts /sec (1.87E-7 = 1 sec).
(3)
Item 10.
(4)
Remove neutron source.
i i
(5)
Verify that light A2 goes on when Burr-Brown readout shows 3.7E-7 and item 15 shows a read out of L for low level trip.
\\
e.
Watchdog Timer Relay Board A3, Pins 8&9.
4-3
i (1)
Disconnect plug labeled A3 CTX (card in position 4 m microprocessor card box).
(2)
Green light on 10 and Niemory Card (Card in position 9 in microprocessor card box) should go off and yellow light on.
(3)
Verify that light Al is on and Item 60 shows 02 CXFAIL.
2.
When the operation of all scrams have been verified with the unit disconnected from the existing system, connect the relays in the NN11000 microprocessor assembly h pug 3B in the TRIGA Console as show in Fig. 2 and raise control rod for eacn test.
Repeat the procedures outlined in Paragraph I.B.I above without a.
voltmeter, since control rod will drop signifying operation of relay.
b.
Do not proceed with installation unless all scrams are operating properly.
C.
The NN11000 Neutron N1onitoring System has been installed in parallel with our existing system since October 1989,(scram relays not connected and reactor completely controlled with our existing licensed system) and the only major problem that we have had was a noisy fission chamber resulting in too high of a count rate when the neutron source was removed. This problem was resolved by replacing the high voltage power supply and assuring that the system was adequately grounded. Critical calibration values as described in paragraph IV below have been recorded each time the reactor is operated since October 1989, an 1 all values have varied less than 5% of the configured values.
D.
Scram Response Time 1.
Since the scram relays in the NN11000 are connected to the original TRIGA Ntark I control console, the response time testing will utilize the same procedure
{(
as previously used.
2.
Raise a control rod and measure the scram time with a stop watch. Compare the scram time with the scram time previously determined before the NN11000 was connected.
3.
In accordance with Paragraph 3.3.1 of our Technical Speci6 cations,"The maximum scram time for any fully withdrawn rod shall be 2 seconds from the time ofinitiation of scram signal to full insertion of the rod."
E.
Sensitivity of Detector (Calibration) 1.
Before replacing the neutron monitoring system in the old console the following procedure will be followed: (The complete procedure described below was done on August 13,1990, and all values have agreed since then. Ilowever, the procedure will be repeated prior to switching over systems with the exception that the thermal calibration will be done after we have removed the linear ion chamber from its aluminum tube guide that is attached to the ion chamber mounting ring and inserted the new Gssion counter).
a.
Place the new Reuter Stokes fission chamber as cbse to the original linear compensated ion chamber as possible.
b.
Align the 6ssion chamber as outlined in Attachment 2.
c.
Thermally power calibrate the reactor as per existing SOP and axially move the linear, log and per cent power ion chambers so that their output devices read the calibrated power (linear and log on old recorder).
d.
Axially move the new fission counter so that the new linear recorder reads the calibrated per cent power.
e.
Verify that the new log recorder is also reading the calibrated value.
g%
4-4
f.
Verify that the ion chamber readings compare with the fission chamber readings.
11.
Loss of high voltage to neutron detector scram function.
( Original System Per Cent Power Chamber 1.
The original per cent power ion chamber and scram circuit will be used as our second detector and consequently there has been no change made in the loss of high voltage scram function.
B.
New NM 1000 system.
1.
Loss of fligh Voltage to the new fission counter activates Relay A3 in the NNI 1000 assembly which is hard-wired to the per cent power scram in the TRIGA console (Fig. 2). The system then scrams as in the original system.
111.
Location and installation configuration for the new instrumentation and control system - See Fig.l.
A.
Specification of the temperature and humidity conditions of the system.
1.
The NM 1000 was tested to the following extreme conditions and found to operate satisfactorily, a.
Temperature: 0 600C.
b.
Relative humidity: 0 98%
2.
The Omaha V.A. TRIGA is installed in an air-conditioned humidity controlled room.
l B.
Evaluation of enclosures, cabinets and connections to building structures for general ruggedness under potential dynamic conditions.
1.
System was tested to meet the requirements oflEEE 344-1975.
2.
Preamplifier and microprocessor assembly enclosures are mounted on basement cement wall (Fig. I, A & B) and hard wiring to TRIGA console is done through conduit (Fig.1, G).
C.
Evaluation of potential contact chatter during dynamic conditions.
1.
All relays are normally energized and do not chatter under postulated seismic acceleration.
2.
The system is designed to scram on potential contact chatter conditions.
D.
Evaluation of cable and component shielding, configuration and/or isolation to mitigate the consequences of electro-magnetic interference (EMI).
1.
Signal outputs are either OPTO or transfonner isolated, inter-connection is via twisted shielded pairs.
2.
EMI levels sufficient to cause a response would cause a transient upscale response, if transient upscale response exceeded 100%, scram would occur.
E.
Evaluation of power supply buffers to mitigate power transient effects.
1.
Power supplies are electronically regulated and input power is buffered by a shielded passive line filter followed by a shielded active tracking filter. All are enclosed within a steel NEMA I enclosure.
2.
After a power loss the surveillance program described in paragraph 4 of this document will be repeated. This is the same program used each day before starting up the reactor.
F.
Evaluation ofinstrument isolation devices.
1.
For the analog outputs isolation is provided i,y an " Analog Devices" isolation converter. Analog Devices rates the input to output isciation at 1500 V RMS.
The device meets the IEEE Standard for Transient Voltap Protection (472-4-5
1974: Surge Withstand Capability) and offers reliable operation over 25o to
+850C temperature range.
2.
Trip outputs are provided by relay contacts. The isolation ratings are not supplied by the manufacturer.
5.
Isolation for communication is provided by optical isolation. General Atomic has tested the isolation of these optical isolators to 120V A.C.
6.
Niechanical isolation is provided at the Geld termination points for all safety and non safety inputs and outputs IV.
N1aintenance and surveillance program.
A.
At the start of each working day or after each major interruption of operation, the reactor electrical and mechanical systems shall be checked out and certified to being proper working order, in accordance with the check list shown in our existing SOP.
D.
When the NN11000 is installed the Chamber and Instrument Sensitivity section of the SOP will be replaced with the checks described in Attachment 3.
E.
N1aintenance will be performed on any of the items in the Daily Checklist which cannot be verified; so that the facility is in compliance with the current Technical Specifications.
V.
Operator training for the new system (outline listed below).
A.
Description and theory of fission counter.
1.
Discrete neutron counting techniques.
2.
Campbelling techniques.
B.
General Description of NNI 1000.
1.
Physical Description.
2.
Performance specifications 3.
Amplifier Assembly.
4.
Signal Process Assembly.
5.
Installation and Setup - Calibration.
C.
Functional Description.
1.
General.
2.
Source-Range Log Count Rate.
3.
Wide-Range Log Power.
4.
Power Range.
5.
N1ultirange Linear Power.
L System Description.
1.
Hardware.
2.
Software.
E.
NNI 1000 Software Description.
1.
liardware/ Software Description.
2.
NN11000 System Function.
3.
Software Organization:
a.
CPU Reset.
b.
Counterffransmitter Niessage Character Received.
c.
I,ocal Display input Character Received.
d.
Local Display Output Character Sent.
4.
Database Organization, Database Item Description.
a.
b.
Error Description.
c.
Daily Checklist.
4-6
l VI.
liardwiring of NNI 100 trip output to TRIGA Control Unit.
A.
The relay outputs of the NN11000 as described in paragraph I B above are connected to plug 3B of the Control Unit of the TRIGA Console. Connections are shown in Fig. 2 and Fig. 7-2 attached. (Please substitute the enclosed Fig. 7 2 for our original submission.)
B.
Connection is through conduit G, Fig.1.
j Vll.
Fignre 7.2 (see revised Fig. attached) Replace Fig. 7-2 submitted October 1989.
A.
Connections of V/F out on J2Al to counter transmitter J1 A1 (drawing 0387 60820) to E3 to Ul-4 to UI-9 to UI-2 of counter 1 (drawing 0387 60820). Drawings are in GA Operations and Ntaintenance Ntanual El17-1000, l.
The connection between the V/F Convertor and Counter I has been made on revised Fig. 7-2.
B.
We do not have remote display unit so it has been deleted on the diagram.
C.
The calibration generator uses the summation of the outputs of a multi-frequency digital i
clock to produce a pseudo-square wave in the Campbelling region. The calibration j
values are adjustable and stability is determined by power supply and passive component drift. In count rate mode discrete frequencies are counted and stability is determined by the clock crystal. Function switching is performed by transistor switches controlled by the counter transmitter which is in turn software controlled. If a calibration function is selected when at power a rod withdrawal prohibit function operates, except in high j
Campbell calibration which causes a scram.
Vill.
Proposed Technical Specification Changes - Watchdog Timer.
A.
See revision to Table 3-1 (page 7) and page 8 (Attachment 4 & 5).
B.
See revision to page 7-6 (Table 7.1) of proposed Amendment No. I, SER ( Attachment 6).
C.
Please substitute the enclosed Attachments 4,5 and 6 for the corresponding pages submitted in October 1990.
IX.
Niinimum count rate rod withdrawal interlock.
A.
The minimum count rate withdrawal interlock was set for 10 counts per second in our October 1990 request due to the fact that the noise level of the detector was high.
Ilowever, since the original request for change was submitted the noise has been eliminated. Consequently, we request that 10 counts per second be deleted and replaced with the original licensed limit of 2 counts per second (Attachments 4 and 6).
s 4-7
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Fig 1 GA REACTOR CONSOLE
r%
1 NM 1000 NEUTRON MONITOR QUICK REFERENCE GUIDE i
1 l
TERMINAL DISPLAY ITEM GROUP 1 (FI KEY)
GROUP 2 (F2 KEY)
GROUP 3 (f3 KEY)
COMPUTER VALUEC SINGLE DETECTOR CAMPBELL DE I CTOR
.... l 10= PERCENT POWER (S) 20= DET COUNTS (S) 30= CMB COUNTS (S)
Il= PERCENT POWER (F) 21= ALPHA OFFSET (S) 31= NOISE OFFSET (S) 12= PERIOD (S)
@ 22= (20)-(21)
(S) @ 32= ((30)-(31))**2 (S) 13= PERIOD (F) 23=
33= CMB MULTIPLIER (S) 14= MODE (I) 24=
@ 34=(33) * (32)
(S)
@l5= RELAY STATUSES (I) 25= DET PPCONST (S) 35= CMB DET PPCONST(S) j 16=
26=
36=
(
@l7= 200MS MESSAGE (A) 27=
(S) 37=
18= %POWERL. MANTAS (S)
@ 28= DET XOVR VAL (S) @ 38= CMB XOVR VAL (S) 19= % POWER. EXPONT (S) 29= DET XOVR SETP (S) 39= CMB XOVR SETP (S)
GROUP 4 (F4 KEY)
GROUP 5 (F5 KEY)
GROUP 6 (F6 KEY) i TRIP SETPOINTS MODES OF OPERATION ERROR STACK 40= LOW LVL TRIP (S) 50= OPERATIO MODE (B) 60=.--.
41= HI LVL TRIP (S) 51= FLT TRIP MODE (B) 61= STK POSITION 1 (B) 42= FLOAT LVL TkiP (S)
- 52= M. LINEAR MODE (B) 62=STK POSITION 2 (B) i 43= RATE TRIP (S)
- 53= LOCKED EXP (1) 63= STK POSITION 3 (B) l 44=
- 54= PERIOD DAC HI (B) 64= STK POSITION 4 (B)
I 45=
55=
65= STK POSITION 5 (B) 46=
56=
66= S fK POSITION 6 (B) 47=
57= MEMORY ADDRESS (1) 67= STK POSITION 7 (B) l 48=
- 58= MEMORY VALUE (B) 68= STK POSITION 8 (B) 49=
59= VERSION NUMIW <
(A) 69= STK POSITION 9 (B) j i
Al LIGHT DEFINITIONS A2 LIGIIT DEFINITIONS ON EQUIPMENT FAILURE (ERR IN STACK)
ON RATE OF CHANGE TRIP, HIGil i
=
=
OFF NO EQUIPMENT FAILURES 1.VL TRIP, OR LOSS OF HIGH
)
=
VOLTAGE l
NONE Of THE ABOVE STATUSES OFF
=
v 1
4-9
STEPS TO READ OUT A TERMINAL DISPLAY ITEM:
1.
SELECT GROUP BY PRESSING Tile FOLLOWING:
F1 KEY = GROUP 1 (ITEM i WILL ALWAYS BE DISPLAYED)
F2 KEY = GROUP 2
.. ETC.....
2.
GO TO ANY ITEM IN GROUP BY PRESSING Tile NUMBER KEYS (0-9)
OR -----> PRESS "." TO STEP FORWARD TO NEXT ITEM OR -----> PRESS " " TO STEP BACKWARDS TO LAST ITEM.
TO CLEAR ALL ALARMS, PRESS F7 KEY, TIIEN ENTER CODE 90.
DATA ENTRY STEPS:
1.
SELECT TERMINAL DISPLAY ITEM TO BE CHANGED.
(*= LOCAL ONLY) 2.
PRESS F8 KEY (Tills PUTS YOU INTO DATA ENTRY MODE).
i l
(%= REMOTE ONLY) 3.
ENTER NEW VALUE FOR ITEM, TIIEN PRESS " ENTER" KEY.
(@= DISPLAY ONLY) in single range in campbelling range Power Equation:
POWER =
(ITEM 22)* ITEM 25 (ITEM 34)*lTEM35
=
I (A)= ASCII (B) = BYTE DATA (F) = FIXED (I) = INTEGER (S) = SCIENTIFIC 1
i i
l 1
4-10
OPERATING MODES DESCRIPTION (Control byte bits 765 4 3 2 1 0) 0 = NO~ MAL Normal Operation, No self test i 1 XXXX00 R
1 = CTR LOW Counter Low Test 1 0XXXX0 1 2 = CTR MID Counter Middle Test 1 0XXXX 1 0 3 = CTR HI Counar High Test 1 0XXXX 1 1 4 = CMB LOW Campbelling Low Test 0 1 XXXX0 1 5 = CMB III Campbelling High Test 00XXXX0 1 6 = SQUARE WAVE Square Wave
- Automatically
- 7 = PULSE Reactor Pulse
" *
- Cycled * * * *
(X means don't care)
Operation Mode 6 causes Rate of Change trip to be inhibited for 10 seconds. After 10 seconds, the NM-1000 automatically switches to Operation Mode 0.
Operation Mode 7 causes the NM-1000 to internally sequence through Operation Mode 4 for 10 seconds, Operation Mode 0 for 10 seconds, followed by a switch to Operation Mode 0. All trip statuses are latched upon entry to Operation Mod-
- ,d unlatched upon completion of the timed Operation Mode 0.
STACK ERRORS DESCRIPTION 00 = EMPTY Stack position is empty (i.e., no error) 01 = BADER BAD Error (posting procedure detected a bad error code) 02 = CXFAIL Ctr/Xmt Failure (No input to Micro from Ctr/Xmt Assembly) 03 = CXSYN1 Ctr/Xmt Out-of-Sync (detected by the SC AN program) 04 = CXSYN2 Ctr/Xmt Out-of-Sync (detected by the PROCES program) 05 = CXBUSY Ctr/Xmt Busy Error (Output Uart is not ready) 06 = CXCBE Ctr/Xmt Rev Uart Error (No Control Byte Received) 07 = CXCOMM Ctr/Xmt Rev Uart Error (Parity, Framing or Overrun) 08 = CX-15V Ctr/Xmt Assembly; Failure in -15V power supply 09 = CX+15V Ctr/Xmt Assembly; Failure in +15V power supply 10 = CMHIV Ctr/Xmt Assembly; Failure in High Voltage power supply 11 = CXHARD Ctr/Xmt Hardware Error (status bits 7,6 or 5 is low) 12 = MI-ISV Microprocessor Assembly-15V failure 13 = MV+15V Microprocessor Assembly +15V failure 14 = SDXOVR (Item 28 > ltem 29) and (Item 38 < Item 39) 15 = SOERR Single Detector Offset Err (Item 20 - Item 21) < 0 16 = COERR Camb Detector Offset Err (item 30 - Item 31) < 0 17 = BADRAM BAD RAM error (hardware error, replace RAM chips) 18 = BADROM BAD ROM error (hardware error, replace ROM board) 19 = CORUN Computing Task Overrun (TASK 1 took more than 0.184 seconds) 20 = EORUN Executive Overrun (all TASKS took longer than 1.5 seconds) 21 = lORUN Interrupt Ovenun (TASK 1 & 9 not run within 1.5 seconds) 22 = TIFAll TASK 1 FMLURE (took more than 20 milliseconds) 23 = DBCHG Data Base Change Error (change in battery bakced up RAM)
/~
(.
4-11
POWER LEVELS DESCRIPTION - ITEN114
.......
0 CAN11' Campbelling Operating Range (using only Camp. Signal)
=
1 SINGLE Single Detector Range (using Single Detector)
=
POWER RANGE SWITCH OVER POINTS 1)
SINGLE
- > CAN1P ITEM 28 > ITEM 29 CAMP
- > SINGLE ITEM 38 < ITEM 39 4-12
NM 1000 NEUTRON MONITOR COMPUTED VALUE EQUATIONS 1)
ITEM 10 & ITEM 11 - PERCENT POWER ITEM 14 1, SINGLE DETECTOR
=
ITEM 10 ITEM 22 (COUNTS PER SECOND) *
=
ITEM 25 (SDET PERCENT POWER CONSTANT)
ITEM 14 0, CAMPBELLING DETECTOR
=
ITEM 10 ITEM 34 (COUNTS PER SECOND) *
=
ITEM 35 (CDET PERCENT POWER CONSTANT) 2)
ITEM 12 & ITEM 13 - RATE OF CHANGE ITEM 12 LOG (ITEM 10 (CURRENT PERCENT POWE.R] -
=
ITEM 10 (PERCENT POWER 1 SECOND AGO])
- 60.0 / 26.05767 3)
ITEM 28 - SINGLE DETECTOR CROSSOVER V ALUE
\\.
ITEM 28 = ITEM 20 4)
ITEM 38 - CAMPBELLING CROSSOVER VALUE ITEM 38 = ITEM 30 4-13
I MULTI-LINEAR MODES DESCRIPTION
=......
0 = AUTO Continuous tracking over all decades.
1 = MANUAL Locked onto a specified decade.
Note: Use display item 52 to set the above multi-linear mode.
Also, display item 50 is used to set the operation modes.
)
l 1
RELAY DEFINIT!ON WHEN ACTIVE z.
1 FLOATING PERCENT POWER TRIP FOLLOWS CONDITION 2
RATE-OF-CHANGE TRIP FOLLOWS CONDITION 3
LOW LEVEL PERCENT POWER TRIP FOLLOWS CONDITION 4
HIGH LEVEL PERCENT POWER TRIP (OR) HIGH VOLTAGE FAILURE FOLLOWS EITHER CONDITION 5*
ANY PROCESS FAILURE PROCESS FAILURES ARE:
(TURN ON A2 LIGHT) 1.
RATE-OF-CHANGE 2.
LOW LEVEL PERCENT POWER 3.
HIGH LEVEL PERCENT POWER 6*
UNDEFINED NEVER
- NOTE: CURRENTLY, THE TRIGA HARDWARE DOES NOT SUPPORT THESE RELAYS.
THE Al LIGHT WILL REMAIN ON UNTIL A CLEAR CODE 90 IS ENTERED.
THE A2 LIGHT WILL REMAIN ON UNTIL THE F7 KEY IS PRESSED.
4-14
l Alignment of NM-1000 Neutron Monitors N
Theory:
The NM-1000 neutron monitor is capable of measuring ten decades of neutron flux with a single fission i
chamber. Alignment of channel requires a basic understanding of the software operation of the NM -
1000, which is detailed below.
The NM-1000 uses two techniques to calculate reactor power. For low power operation the channel calculates reactor power utilizing counting techniques where discrete neutron counts from the fission chamber are directly proportional to reactor power. For high power operation, the channel calculates reactor power utilizing Campbelling techniques where the reactor power is proportional to the square of the rms value of the a.c. 0 nal from the fission chamber. Combining these techniques, with sufficient 3
overlap, allows the NM-1000 to cover a full ten decades.
To calculate the reactor power, the following two equations are used by the NM-1000.
Count Rate Region:
(Equation 1)
Percent Power - [ Counts /Sec} * { Count Rate Power Constant}
ITEM 10 ITEM 20 ITEM 25 Campbell Region:
j t
i l
Campbell Lmearizing Campbell i
I I
O Percent power- [ Counts /Sec]2 * [ Factor) * [ Power Constant]
(v)
ITEM 10
[ ITEM 30]2 ITEM 33 ITEM 35 The following procedure details the complete calibration of the NM-1000 channel. For routine recalibration, follow steps 3.2,4.2,5.1 and 6.1 Method:
The first gep in the NM-1000 alignment is to properly position the fission chamber in the reactor core.
The detector is a standard General Atomics supplied RSN-314 Reuter Stokes fission chamber.
]
1.1)
The detector should be positioned to draw 1.0 mA from the high voltage power supply (800 volts nominal) at 100% power. Next, the PA-15 preamp discriminator should be adjusted. The number of shutdown counts (with the start-up source in a cold core) will depend on the reactors license power, and will be a function of the crossover from count rate to Campbell.
The cross over point from count rate to Campbell should be set about three decades down from the full power flux (about ^.1% power). This gives three full decades of Campbell signal with adequate hysteresis for the crossover from Campbell to count rate.
2.1)
To set the discriminator, change the count rate to Campbell crossover in the NM-1000 software to 8X106 (ITEM 29). Bring the reactor to 0.1% power. Adjust the discriminator (R304 in the PA-15) for 1.2X106 i
counts per second as displayed on the NM-1000 display terminal (ITEM 20). This setting will give 12 counts per second at IX10-6 percent power (typical shutdown power), and 1.2 counts per second at IX10-7 percent power (typical rod withdrawal permit point). Change the count rate percent power constant v
4-15
(ITEM 25) to 1.87X10-7 for a power indication of 0.1 percent power as read on the NM-1000 display terminal (ITEM 10).
3.1) Change the count rate to Campbell cross over to 1.2X106 (ITEM 29).
3.2) Increase reactor power to full power and allow the reactor to stabilize (several minutes).
3.3) Adjust the Campbell amplifier gain (R27 in the Campbell amp) for 8X104 counts per second as displayed on the NM-1000 terminal (ITEM 30).
4.1) Set the Campbell linearizing factor to 0.370 (ITEM 33), the Campbell to count rate crossover to 1950 (ITEM 39), and the Campbell noise constant (ITEM 31) to 65.
4.2) To set the Campbell percent power constant, take ten consecutive readings of the Campbell signal (ITEM
- 30) at full power, and find the average. Using equation (3), calculate the Campbell percent power constant and enter as ITEM 35.
ITEM 35 =
ITEM 10 (Equation 3)
[lTEM 30]2 * [lTEM 33]
]
1 Verify that the power indicated on the NM-1000 is 100% (ITEM 10).
5.1) To check the crossover alignment from Campbell to countrate, turn on the log chart recorder and scram the reactor from full power. Examine the trace in the crossover region (about 0.1 percent power) and note any discontinuity. If a discontinuity is evident, observe whether the Campbell signal is too high or too low at the crossover.
J
(
6.1) To precisely align the Campbell to countrate crossover if a discontinuity is evident, use the f illowing procedure.
Campbell signal too high at crossover:
Increase the Campbell detector noise constant (ITEM 31) by about five to ten percent of the current j
Campbell detector noise constant and repeat step 5.1 above. Note any discontinuity at the crossover, and make appropriate adjustments to the Campbell detector noise constant. Repeat steps 5.1 and 6.1 as necessary.
Campbell signal too low at crossover:
Decrease the Campbell detector noise constant (ITEM 31) by about five to ten percent of the current Campbell detector noise constant and repeat step 5.1 above. Note any discontinuity at the crossover, and make appropriate adjustments to the Campbell detector noise constant. Repeat steps 5.1 and 6.1 as necessary.
4-16
ADDENDUM TO DAILY CHECKLIST CilAMBER AND INSTRUMENT SENSITIVITY I.
NM-1000 Calibration Constants A.
Verify that all calibration constants entered into the NM 1000 agree with the values posted on the control console (see sample label below).
NM-1000 Calibration Constants 21
=
25
=
29
=
31
=
33
=
35
=
39
=
40
=
41
=
42
=
43
=
51
=
52
=
53
=
PA-15 DISC
=
DATE:
BY:
II.
Calibration modes 1,3,4 &5 are sequentially tested for correct power level outputs. Item 50 of the NM-1000 is programmed to the appropriate mode and the corresponding power level is read from item 10. The power level is then compared with the configured test levels and is deemed OK ifit falls between 95% and 105% of the configured vales.
A.
The configured values are stored in the following configuration channels. (Attachment 1, Page 2) 1.
Ite m 1 Counter Low Test 2.24E-5 % Power 2.
Item 3 Counter High Test 5.74E-2 % Power 3.
Item 4 Campb. Low Test 1.08E+1 % Power 4.
Item 5 Campb. High Test 1.09E+2 % Power 4-17
l i
I
)
i B.
The procedure is as follows:(Item refers to pressir.g key on Burr-Brown Microterminal).
l.
Item F5, Item F8, Item 1, Enter,(Readir.g=CTR LOW) 2.
Item F1, Read % Power and linear recorder and record in log 3.
Item F5, Item F8, Item 3, Enter,(Reading =CTR HI) 4.
Item F1, Read % Power and linear recorder and record in log 5.
Item F5, item F8, Item 4, Enter,(Reading =CMB LOW) 6.
Item FI, Read % Power and linear recorder and record in log l
7.
Item F5, Item F8, item 5, Enter,(Reading =CMB HI) 8.
Item F1, Read % Power and linear recorder and record in log 9.
At the end of the calibration test reset the NM-1000 to the normal mode. Item F5, item F8, item 0, Enter (Reading = Normal) 1 111.
High Power Level Trip A.
Raise control rod.
B.
Push " Power Scram Test" button on console.
C.
Verify that control rod scrams.
D.
Verify that A2 on Burr-Brown is on.
E.
Item F1, Item 5, Verify that read out shows H for High.
i IV.
Period Trip A.
Raise control rod (do not use same rod used for 111 above).
B.
Item F5, item F8, Item 5, Enter (Reading =CMB HI).
Q C.
The above should cause a momentary high positive period and activate the period trip.
D.
Verify that control rod scrams.
E.
Verify that A2 light is on.
F.
Verify that Item F1, Iten 1 Aows a read out of R for rate.
V.
Loss of High Voltage Trip A.
Raise control rod.
B.
Push "High Voltage Test" button on console.
C.
Verify that control rod scrams.
D.
Verify that A2 light is on.
E.
Verify that item F15 shows a read out of 32/V.
VI.
Startup Channel (Low Level Trip)
F.
Remove Neutron Source.
G.
Allow enough time for the NM-1000 power to drop below the source trip limit.
H.
Verify that light A2 goes on with Burr-Brown readout shows 3.7E-7.
I.
Verify that item FI, Item 5 shows a readout of"L" for low level trip.
J.
Try to raise control rod.
VII.
Watchdog Timer (Do first run day of each month)
A.
Raise control rod.
B.
Disconnect plug labeled A3 CTX (card in position 4 in microprocessor card box).
C.
Green light on 10 & Memory Card (card in position 9 in microprocessor card box) should go off and yellow on.
v/
i 4-18
D.
Verify that light Al is on.
E.
Verify that Item F6(60) shows CXFAIL.
F.
Go through item F6,1-9 until read out shows empty.
G.
Verify that control rod scrams.
4-l9
O ATTACHMENT #2 O
O