ML13323A260
| ML13323A260 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 10/31/1981 |
| From: | KINEMETRICS, INC. |
| To: | |
| Shared Package | |
| ML13323A259 | List: |
| References | |
| PROC-811031, NUDOCS 8204050310 | |
| Download: ML13323A260 (13) | |
Text
OPERATING INSTRUCTIONS FOR SSH-3/FBA-13 SEISMIC SCRAM AND TRIP SYSTEM IMPORTANT If the price or schedule is affected by this document approval, Bechtel must be notified prior to-fabrication or such claims are waived.
Approval of documents involving calculation, analysis or test report is only an acceptance of the method used by the supplier. Supplier retains full responsibility for design.
Approval of this document does not relieve the supplier from full responsibility for contract or purchase order requirements including, but not limited to, adequacy and suitability of. materials and/or equipment represented thereon for the int ded funct DOC STATUS 9Y TOUE Tus DATE
] APPROVED - MANUFACTURER MAY PROCEED
/
3 APPROVED EXCEPT AS NOTED. MAKE CHANGES AND RESUBMIT. MANUFACTURER MAY PROCEED AS APPROVED.
I NOT APPROVED - CORRECT AND RESUBMIT 7
INFORMATIONONLY
[~]DISTRIBUTION REOUIRED o
to ISSUED:
OCTOBER 1981 OFI KINEMETRICS, INC.
222 Vista Avenue Pasadena, California 91107 (213)795-2220 8204050310 820401-'
PDR ADOCK 05000361 P
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1.0 GENERAL DESCRIPTION Each seismic scram instrument is comprised of two packages:
a model FBA-13 triaxial accelerometer and a model SSH-3 electronics package. The two items are interconnected by an electrical cable.
The FBA-13 accelerometer senses accelerations, in three mutually perpendicular axes, caused by earthquake motions; and produces electrical voltages proportional to these accelerations. In the SSH-3, these output voltages are compared to reference voltages proportional to the scram acceleration set points. When the acceleration for any axis reaches or exceeds the scram set point, an output relay is actuated. Each of these three relays has double pole, single throw, normally closed contacts.
The contacts open and stay open as long as the accele ration exceeds the set point plus an additional ten seconds.
2.0 INSTALLATION & MOUNTING 2.1 For the FBA-13 The steps for unpacking and installing the FBA-13 are as follows:
- 1. Remove the accelerometer from its shipping container.
- 2. Open the accelerometer package by means of the latches at each end. Examine the various com ponents for obvious damage, such as loose screws, etc., since long distance shipments occasionally do cause this sort of damage.
1r permanent installation, the accelerometer package must be bolted to the floor or other structural member.
It has a.single hole in the base for a
" bolt.
The accessory kit includes a concrete anchor, a k-20 stud, washer, and nut, and a seal-type washer to attach the package to the.floor. Details of the installation are shown in Figure 1.
- 4. Under normal conditions, the floor will be sufficiently level so that leveling will not be required.
However, if required, one or more common washers can be inserted.under the appropriate base casting pad to achieve the desired degree of levelinq which need not be more accurate than 10 to 2
- 5. The accelerometer package must be oriented so that the longitudinal, L, axis is parallel to the plant North-South axis which was assumed in the seismic analysis.
/
ANCHOR* HOLE WALL 6" MINIMUM A
A 12" PREFERRED SEAL WASHER NUT, 1/4-201N&
STUD,1/4-20 X 3" ACCELEROMETER 6"
MINIMUM 12" PREFERRED Washe SMA-3 BASE FLOOR PHILLIPS "RED HEAD" a so NOTE:
STUD ANCHOR e
PARTS SUPPLIED WITH FBA-13 o
TORQUE NUT TO 30 TO 70 IN LBS.
SECTION A-A INSTALL ANCHOR. AS SHOWN BELOW Insert Red Hecd In end Rotate driver as you Take out and I ghtly of driver, top light, rapid blows.
top red expander plug In cutting end. Clean out hole.
To remove colr" wbdedo In driver,
-takeotithansdleand insert apered and In lower hole of driver. With sharp blow. "collr" pops Put back and strike Break off "collar" of insert bolt In exposed out. Put handle I a beck In to p hole hard until face of driver Red Head with blow on threaded end.
tio ole almost touches surface.
side of driver.
tornorrect side).
FIGURE 1 INSTALLATION OF FBA-13
2.2 For the SSH-3 The steps for unpacking and installing the SSH-3 are as follows:
- 1. Remove the electronics package from its shipping container.
- 2. Unscrew the four screws in the lid and remove the lid.
Examine the various components.for any obvious damage. Particularly, assure that both batteries are properly clamped and that all four circuit boards are fully inserted.
Reinstall the lid.
- 3. For permanent installation, the electronics package must be bolted to the floor or a convenient pedestal. Use four V"-20 bolts to attach this package to the mounting surface.
Torque the bolts to 30 to 70 in.- lbs.
(Note:
the levelness and orientation of the electronics package are of no importance.)
3.0 ELECTRICAL CONNECTIONS All of the electrical connections are shown in Figure 2.
3.1 Interconnection of FBA-13 & SSH-3 The two packages are to be interconnected by a cable assembly in accordance with drawing 101165.
3.2 AC Connections Connect 120Vac power to the AC POWER connector, as shown in Figure 2.
3.3 Output Connect from the OUTPUT connector to the plant protection system as required. Ordinarily only the contacts brought out to pins I & J are used for connection to the plant protection system.
Pins A thru F are normally used only for test purposes.
OUTPUT (SEE DETAIL A)
SSH-3 ELECTRONICS FBA-13 PACKAGE TRIAXIAL (ACCEL.
CABLE ASSY. 101165 AC POWER (SEE DETAIL B)
L A4 DH A
EN L
H DETAIL B DETAIL A ELECTRICAL CONNECTIONS FIGURE 2 REVISIONS ZONEpno
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4.0 ADJUSTMENTS & OPERATION See Figure 3 for general arrangement of the FBA-13 and SSH-3.
4.1 Battery Voltage At the SSH-3, check the battery voltages as follows:
Push the BATT switch toward + BATT.; the BATTERY VOLTAGE meter should read at least 12 Vdc.
Push the BATT switch toward -
BATT.; the BATTERY VOLTAGE meter should read at least 12 Vdc.
Note:
At installation, the battery voltages may be lower than 12 Vdc until the AC power has been connected for 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.
If either battery is less than 12 Vdc after AC power has been connected for 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />, the battery should be replaced.
4.2 Accelerometer Adjustment At the FBA-13, after the accelerometer package is installed and the accelerometer connected to the electronics package, it is necessary to balance the output of each accelerometer:
Measure the "zero" output voltage with a digital voltmeter. Connect the DVM as shown in Figure 4 to the accelerometer circuit board (E-Z hook leads are highly recommended for connecting to the circuit board).
The voltage so measured must be less than 25 mV.
If it is more than 25 mV, adjust the centering of the goldplated capacitor plates as shown until the voltage is less than 25 mV. The adjustment should be made very carefully; a slight touch on the screwdriver will change the output a few tens of millivolts.
4.3 Full Operation The seismic scram instruments are now operational and ready to respond to an earthquake.
ARRANGEMENT OF FBA3T CASE MOION FOR
+ACCELERATION 3L LL FOR V, UP Is +
T CONNECTOR ARRANGEMENT OF SSH-3 TEST cpm
-BATT
+BATT
+
+0
-12V
+12V GC1245 GC1245 REGULATOR BATTERY VOLTAGE BATTERY BATTERY COMPARATOR V
COMPARATOR COMPARATOR 3
I FIGURE 32
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07 o
K 0000 B
L
~F v
-EE
/0A BALANC ING THE ACCELEROMETER OUTPUT FI GUREA4 e-9o
5.0 TESTS AND CALIBRATION The seismic scram instruments can be tested by means of switches and jacks inside the SSH-3 Electronics Package.
5.1 Functional Test To verify proper connections and general operation of the seismic scram instruments, the following test should be conducted:
- 1. Using an ohmmeter, verify that, at the OUTPUT connector:
pin A to pin B is closed, pin C to pin D is closed, pin E to pin F is closed, and pin I to pin J is closed.
2a. Momentarily depress TEST switch L.
Verify that:
pin A to pin B is open, pin C to pin D is closed, pin E to pin F is closed, and pin I to pin J is open.
2b. Wait 15 seconds, then verify:
pin A to pin B is closed, and pin I to pin J is closed.
3a.
Momentarily depress TEST switch V.
Verify that:
pin A to pin B is closed, pin C to pin D is open, pin E to pin F is closed.
and pin I to pin J is open.
3b. Wait 15 seconds, then verify:
pin C to pin D is closed, and pin I to pin J is closed.
4a. Momentarily depress TEST switch T Verify that:
pin A to pin B is closed, pin C to pin D is closed, pin E to pin F is open, and pin I to pin J is open.
4b. Wait 15 seconds, then verify:
pin E to pin F is closed, and pin I to pin J is closed.
5.3 Calibration It is possible to measure the set points of the SSH-3 by using an FC-1 Field Calibrator.
- 1. For the FC-1, turn switch to ON, and measure its BATT voltage, Eb.
- 3. Connect the black plug of the FC-1 into the COM jack of the SSH-3; and connect the red plug of the FC-1 into the L jack of the SSH-3.
- 4. Connect an ohmmeter to the SSH-3 OUTPUT connector pins A and B.
- 5.
Gradually increase the FC-1' ACCELERATION dial until the ohmmeter indicates that the connection between pins A and B opens; record the dial reading, A, with a decimal point after the number in the window.
- 6. Calculate the set point:
(A)(E (10.00)(S)
Where S.P. = set point in g's.
A
= reading of FC-1 ACCELERATION dial (eg. 3.54)
Eb = FC-1 battery voltage (eg. 6.27v)
S
- acceleration sensitivity of FBA-13 accelerometer (eg. 2..50v/g)
- 7. Repeat steps 2 thru 6, for V using pins C & D, and for T using pins E & F.
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6.0 SERVICE AND MAINTENANCE The Seismic Scram Instruments require essentially no maintenance. The SSH-3 has rechargeable batteries, and the built-in battery charger will keep the batteries from discharging.
Once a month, the battery voltages, both plus and minus should be checked.
If either battery is less than 12 Vac, the battery should be replaced.
Once every six months, the seismic scram instruments should have a functional test as described in paragraph 5.1.
Every eighteen months, or whenever there is a convenient outage or refueling, the balance of three accelerometers in the FBA-13 should be measured and adjusted if greater than 25 mV, as described in paragraph 4.2.
Also at this time, the cali bration of the set points should be checked as described in paragraph 5.3.
Every three years, both batteries should be replaced.
7.0 PARTS LISTS
- 7. 1 Accessory Parts The following parts are furnished as accessories:
For the FBA-13:
Connector, MS3106F-20-29P Stud, P/N 700018-24 Stud Anchor, Phillips S14 Thred Seal, Parker 7500 Washer, Flat, & inch Hex Nut, -20 Desiccant, P/N 700049 For the SSH-3:
Connector, MS3106F-20-29P Connector, MS3106F-20-3S Connector, MS3106F-18-1S Desiccant, P/N 700049 7.2 Service and Maintainance Parts The following parts may be ordered for service and maintainance:
Batteries, P/N GC1245-1, 2 required Lf 2
Model FC-1 Field Calibrator