ML17250A562
| ML17250A562 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 03/17/1979 |
| From: | Schuler T, Snow B ROCHESTER GAS & ELECTRIC CORP. |
| To: | |
| Shared Package | |
| ML17250A560 | List: |
| References | |
| RSSP-1.5, NUDOCS 8009160562 | |
| Download: ML17250A562 (8) | |
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RSSP-1.5:1 RSSP-1.5 VALVE INTERLOCK VERIFICATION " FEEDWATER ISOLATION
1.0 PURPOSE
To describe the steps necessary to perform the valve interlock verification for feedwater isolation.
2.0 TEST REQUIREHENTS:
2.1 To verify interlocks associated with high steam generator levels, system Tavg..and turbine trip.
3.0 3.1
REFERENCE:
Foxboro Instrument Block Diagrams BD18 and BD19 4.0 4 ~ 1 INITIAL CONDITIONS:
Plant in either hot or cold shutdown PRECAUTIONS:
.5. 1 If secondary side condensate system is pressurized, the guard valves before the Steam Generator flow control, main and bypass (I,oop A 6 B) valves must be maintained closed.
5.2 If test is conducted during hot shutdown, the Steam Dump Proportional Unit (steam dump cabinet) must be placed on manual.
5.3 If test is performed when plant maintenance is being performed verify that conductance of test will not conflict with maintenance work or comprimise safety of maintenance people.
5.4 If plant is in hot shutdown, any feedwater make up to steam generators is to be supplied by Auxiliary Feedwater system.
6.0 INSTRUCTIONS
6.1 Prior to checking F.W. valve interlocks, check the valves for operability as follows:
6.1.1 Verify that Hain Feedwater valves have been manually cranked to the neutral position.
6.1.2 Verify that air supply is turned on to valve positioner.
6.1.3 Verify feedwater isolation reset at Control Board.
6.2
-Ensure that the following RC system level control bistables are energized.
RSSP-1.5:2 6.2.1 6.2.2 6.2.3 6.2.4 6.2.5 6.2.6 LC-461 A/B bistable (Loop A steam generator)
LC-462 B/C bistable (Loop A steam generator)
LC-463 C/D bistable (Loop A steam generator)
LC-471 A/B bistable (Loop B steam generator)
LC-472 B/C bistable (Loop B steam generator)
LC-473 C/D bistable (Loop B steam generator)
Note:
To be energized, the water level in S/G's must be less than 70%. If level is high (greater 70'/) than a
DC current generator must be utilized at the test jacks of the concerned channels and a simulated input injected.
6.3 Place C.B. Hand-automatic transfer station for the following main feedwater controllers on manual.
6.3.1 6.3.2 6.4 HC-466 Loop "A" LCV HC-476 I,oop "B" LCV Place CB Hand-automatic transfer station for the following by-pass Controllers on manual.
6.4.1 HC-480 Loop "A" by-pass' 6.4..2..
HC-. 481. Loop "B" by-pass 6.5 Stroke the following main and by-pass feedwater valves for Loop A 6 B through full cycle and then leave in open position.
Note:
Valve action should be verified by visual observation.
6.5.1 6.5.2 6.5.3 6.5.4 FCV-466 Loop A FCV-480 FCV-476 Loop B FCV-481 cycled left open 6.6 To verify action Hi level override, establish a 2/3 logic by placing the following bistables in the trip mode (proving switch in protection racks).
6.6.1 6.6.2 6.6.3 6.6.4 LC-461A Loop A LC-462B LC-471A Loop B
LC-472B tripped 6.7 Verify visually that all FCV's have automatically stroked to their closed positions.
6'.1 FCV-466 FCV-480 FCV-476 FCV-481 closed NOTE:
Verification of remaining logic combination need not be done at this.time as a subsequent test (at safeguard test panel) will prove out this capability.
RSSP-1.5:3 6.8 Return the bistable proving switches for the following bistables to'ormal position and verify that the valves open automatically.
Reset by-pass valves if necessary.
valve open 6.8.1 LC-461A 1
FCV-466 6.8.2 LC-462B
)
FCV-480 6.8.3 LC"471A FCV-476 6.8.4 LC-472B
)
FCV-481 6.9 6.10 6.11 Disconnect field input terminals to temperature control bistable to TC 401F (Steam Dump rack at li.C.B.)
Connect DC current generator to input terminals of TC 401F bistable and inject a signal equivalent to that which corresponds to a T avg.
temperature greater than 554 F (approx.
556 F)
Place the following CB tfain F.W. Hand-automatic transfer stations in the auto position and verify that the valves are open:
6.11.1 HC-466 Loop A LCV 6.11.2 HC-476 Loop A LCV 6.12 By-pass valve controllers were left on hand control from previous step.
Verify that the following valves are open:
6.12.1 LCV-480 Loop A 6.12.2 LCV-481 Loop B
6.13 6.14 6.14.1 6.14.2 6.14.3 6.14.4 Decrease input signal, to TC 401F bistable equivalent to that which corresponds to a T avg.
temperature less than 554 F (approx.
552 F)
Verify that the following valves have stroked automatically to the closed position.
FCV-466 Loop A FCV-480 FCV-476 Loop B
FCV-481 6.15 6.16 Simulate turbine operation condition by blocking open two of the 63 AST auto stop oil pressure mercoids..
Verify that the following valves have stroked automatically to their open position:
RSSP"1.5:4 6.17.1 6.17.2 6.17.3 6.17.4 FCV-466 I,oop A
FCV-480 FCV-476 I,oop B
FCV-481 6.18 Unblock the two 63 AST.mercoids which were blocked in step 6.16 above.
- 6. 19 6.19.1 6.19.2 6.19.3 6.19.4 Verify that the following valves have stroked automatically to their closed positions:
LCV-466 Loop A LCV-480 LCV-476 Loop B
LCV-481 6.20 6.21 6.21.1 6.21.2 6.21.3 6.21.4 6.22 Increase input to,temperature control bistable TC 401F to that which corresgonds to a T avg.
temperature greater than 554 F
0 (approx.
556 F)
Verfiy that the following valves have stroked automatically to their open position:
LCV-466 Loop A I,CV-480 LCV-476 I,oop B
LCV-481 Jog switch on controllers HC-466 and HC-476 from Auto to manual several times to decrease controller output to 0% and verify that the following valves remain in the open position:
(Observe small indicators above controllers for Q 6.22.1 6.22.2 6.22.3 FCV-466 FCV-476 FCV-466) FCV-467 Valve open Valve open Auto 6.23 Vith by-pass valve controller HC-481 and HC-480 on manual position, adjust output to 0/ and verify the following valves rem'ain in the open position:
6.23.1 6.23.2 FCV-480 FCV-481 Valve open Valve open 6.24 Place the following Hand-automatic transfer controllers to the manual position (HCB) and reduce manual control setting to zero.
6.24.1 6.24.2 HC-466 Loop A,;
HC-476 Loop B
manual position manual position 6.25 Verify that the following valves have automatically stroked to their closed position:
RSSP-1.5:5 6.25.1 FCV-466 Loop A 6.25.2 FCV-480 6.25.3
FCV-476 Loop B
6.25.4 FCV-781 Valve closed 6.26 Remove DC current generator from temperature control bistable TC 401F and reconnect field wiring to input terminals; wire connected.
6.27 If DC current generators had been connected to test jacks at steam generator level channels remove from service to restore channel to normal.
6.27.1 6.27.2 6.27.3 6.27.4 6.27.5 6.27.6 LC-461 LC-462 LC-463 LC-471 LC-472 LC-473 restored restored restored restored restored restored to normal to normal to normal to normal to normal to normal 6.28 Realign system and valves as required for subsequent operation.
CO>iPLETED BY:
DATE COHPLETED:
SHIFT FOREHAN:
RESULTS 6 TEST REVIEW:
DATE: