ML20080G921

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Informs That Redundant,Remote Valve Position Indication for Four Encapsulated Containment Sump Isolation Valves Verified,In Response to 830908 Request
ML20080G921
Person / Time
Site: Farley  Southern Nuclear icon.png
Issue date: 09/13/1983
From: Clayton F
ALABAMA POWER CO.
To: Varga S
Office of Nuclear Reactor Regulation
References
NUDOCS 8309200391
Download: ML20080G921 (5)
v • d • e


Text

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Melling Address s ALbama Power Company 600 North 18th Street Post Offica Box 2641 Birmingham, Alabama 35291 A

Telephone 205 783-6081 F. L. Clayton, Jr.

Senior Vice President Mabama NWCf Flintridge Building Docket Nos. 50-348 thesouthem electre system 50-364 September 13, 1983 Director, Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. C. 20555 Attention:

Mr. S. A. Varga Joseph M. Farley Nuclear Plant - Units 1 and 2 Supplementary Information on the Inservice Testing of Containment Sump Isolation Valves

Dear Mr. Varga:

In discussions held with Messrs. Ed Reeves and Frank Chierney of your staff on September 8, 1983, Alabama Power Company was asked to verify that redundant, remote valve position indi, cation was provided for the four encapsulated containment sump isolation (RHR and Containment Spray Pump Suction) valves in each unit. In response to this request, Alabama Power Company has verified that redundant, remote valve position indication for these valves is provided at the following three locations on the main control board as described below:

1.

Main control board valve switch - Red and green position indication lights are located on the main control board adjacent to the valve switch. An illuminated red light indicates a fully open valve and an illuminated green light indicates a fully closed valve. If both lights are illuminated, the valve is partially open and is moving from the open-to-closed or closed-to-open position.

2.

Monitor light box No. 2 - An illuminated white indicating light on the monitor light box No. 2, which is located on the main control board, indicates that the valve is fully open.

3.

Monitor light alarm - An illuminated white indicating light alarm, which is located on the annunciator panel of the main control board, indicates that the valve is fully open.-

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Docket Nos. 50-348 & 50-364 Joseph M. Farley Nuclear Plant - Units 1 and 2 Supplementary Information on.the Inservice Testing of Containment Sump Isolation Valves September 13, 1983 Page 2 These indications are received ' rom one four-rotor type, four-train,

- geared limit switch which is an integral component of the Limitorque motor operator utilized on each of these valves. A technical description of this switch, including setting procedures, is provided in Attachment 1.

The limit switch has four rotors, which each have four sets of contacts. A listing of the rotors and contacts which are connected to each of the lights is presented in Attachment 2.

Diverse power supplies are utilized to energize the indicating lights from the limit switch. The main control board indicating lights (red and green) are energized through the main 600 volt motor control center supplying the motor operator. The monitor light box and monitor light alarm lights (white) are energized from an inverter.

The technical description provided herein is typical of all four encapsulated containment sump isolation valves in each unft, and describes how valve position indication is taken from physical actuator movement. One valve (Q2E11V025A) in Unit 2 presently takes indication froa a rotor which has been determined to be out of calibration. During the second refueling outage of Unit 2, scheduled to begin September 17, 1983, a modification will be made to this valve operator so that its position indication will be derived from a calibrated rotor. With completion of this modification, this valve will function as described above.

Yours truly, F. L. Clayton, Jr.

STB:kc/D-302 Attachments cc:

Mr. R. A. Thomas Mr. G. F. Trowbridge Mr. J. P. O'Reilly Mr. E. A. Reeves Mr. W. H. Bradford l

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ATTACHMENT 1, PAGE 1

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PROCEDURE FOR SETTING FOUR TRAIN The four train geared limit switch (Rotor type) employs GEARED LIMIT SWITCH-ROTOR TYPE four rotary drum switches, each having four contacts.

When the rotor is properly set to trip at the desired po-sition, two of these contacts open and two close electric circuits. Generally, one rotor is set to trip at full open U

position of the valve and one rotor is set to trip at full 1

- t J h close position of the valve. The ogher two rotors are set W

at some intermediate position, depending on the require-i ments of the project.

l' To sc t the switches of a four train rotor type switch, T],

follow the same procedure as described for the two train rotor type switch. The upper setting rod, pc. #48, allows adjustment of the two adjacent upper rotors, and lower setting rod, pc. #48, allows adjustment of the two adja-cent lower rotors.

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  1. % t 8 x %" FILL. HD. CAP 55 2

GASKET. GEAR FRAME SCREW & L.W. 22 2 OILITE BUSHING 41 2 GEAR F%ME 56 16 INSERT (ROTOR) 23 1 DRIVE SH AFT 42 4 INTER. GEAR SHAFT 57 2 "O" RING. # 1820 5 24 1 DRIVE PINsON (INTERN AL) 43 4 INTER. PINION SHAFT 58 2 GROOVE PIN % c x l' LG. 25 1 HELICAL PINION 44 4 G.L. FR AME CO vER 61 2 FINGER BASE 26 2 GROOVE PIN % @ x 1* LG. 45 16 INTERMITTENT GEAR 62 16 R H. FINGER ASS'Y 27 2 DRIVE SLEEVE & GEAR 46 12 (NTERMITTENT PINION 63 16 L.H FINGER ASS *Y 28 2 DECLUTCH SPRING 47 4 STEM SPUR PINION 64 32

  1. 10 32 x 1* LG. HEX. HD C. S.

29 2 DRIVE PINION SPUR 48 2 SET ROD 65 32

  1. 10 LOCKWASHER 30 2

PIN % @ x % LG. 49 4 ROTOR 66 64

  1. 10 32 HEX NUT 31 1

CARTRIDGE GASKET 50 4 GROOVE PIN % @ x %* LG. 67 64

  1. 10 SW B D W ASHER 32 1

CARTRIDGE MTG. PLATE 51 4 COVER GASKET 68 4

  1. % 20 x % FILL. HD. C. S.

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  1. %.20 m % LG. SOC. HD. C. S.

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  1. 6 32 x % LG. FILL. HD. M. S.

69 4 %" INT. TOOTH LOCKWAsHER 34 3 '*O". RING. # 622711 53 2 "O" RING # 1820 3 35 1

  • O"-RING. #6227-21 54 2

SETTING ROD BUSHING

ATTACHMENT,1. PAGE 2 PROCEDURE FOR SE'ITING TWO TRAIN GEARED LIMIT SWITCH-ROTOR TYPE r The two train geared limit switch (rotor type) employs mittent Gear Shaft, over the rotor to be set. When two rotary drum switches, each having four contacts. the valve is full open, close the valve slightly to When the rotor is properly set to trip at the desired po-allow for coast of moving parts. sition, two of these contacts open electric circuits and two contacts close electric circuits. Generally, one rotor is set

3. Turn pc. #48 clockwise with a screwdriver, to trip at the full open position of the valve, and the other until it reaches a stop position.

rotor is set to trip at the full close position of the valve.

4. If the rotor to be set has not turned 900 to open E ch drum switch may be adjusted independently of the the contacts which are to trip open at this po-other.

sition, insert screwdriver on pc. #42 and turn One circuit on the one drum is used to open the in the same direction as noted previously until "open" holding coil circuit of the motor controller, and ac. #49 tarns and opens the contacts to be set. enother circuit of the drum is used to operate the "open" If the rotor, pc. #49, has turned so that the indicating light for the valve. contacts are already open, turn pc. #42 in the On die other drum, one circuit is used to control the opposite direction as previously noted until the " closed" indicating light, and another circuit may be used contacts close. Then, turn pc. #42 slightly in the to open the "close" holding coil circuit of the motor con-same direction as originally noted until the con-troller. Please refer to the wiring diagram assigned for tacts open. the actual application and circuitry to be used. The wiring dirgram may be furnished as part of the Limitorque valve

5. The rotor is now set at the correct position so control, or may be furnished by the contractor who sup-that the contacts open. Back off on pc. #48 plies the motor control and pushbutton station equipment.

until it stops. Again place screwdriver on pc. In order to set the geared limit switches to trip at any

  1. 42 to insure that it is tight and will not rotate, desired position, the following procedure should be ob-(Do not force.)

served:

6. The same procedure should be followed for the
1. Be certain all electric power is turned off.

other rotor adjustment by closing the valve com-

2. Use the handwheel to manually open the valve, pletely to set the tripping position of the other and note direction of rotation of pc. #42, Inter-rotor.

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