ML17261A991
| ML17261A991 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 02/23/1990 |
| From: | Widay J ROCHESTER GAS & ELECTRIC CORP. |
| To: | |
| Shared Package | |
| ML17261A978 | List: |
| References | |
| AP-TURB.2, NUDOCS 9003080371 | |
| Download: ML17261A991 (20) | |
Text
EOP:
AP-TURB.2 TITLE:
AUTOMATIC TURBINE RUNBACK REV:
8 PAGE 1 of 10 ROCHESTER GAS AND ELECTRIC CORPORATION GINNA STATION CONTROLLED COPY NUMBER TECHNICAL REVIEW PORC REVIEW DATE PLANT SUPE NT NDENT 8
cled 0
EFFECTIVE DATE QA NON-QA CATEGORY 1. 0 REVIEWED BY:
GINNASTATION START:
DATE TIME COMPLETED:
DATE TIME:
900308037'00g27, DR ADDCK 0500020 PNu
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AP-TURB.2 TITLE:
AUTOMATIC TURBINE RUNBACK REV:
8 PAGE 2 of 10 A.
PURPOSE This procedure provides the steps necessary to control the plant during an automatic turbine runback.
B.
ENTRY CONDITIONS/SYMPTOMS 1.
SYMPTOMS The symptoms of AUTOMATIC TURBINE RUNBACK are; a.
Annunciator E-28, POWER RANGE ROD DROP STOP -54/5 sec alarm, or b.
Annunciator C-14, ROD BOTTOM ROD STOP alarm, or c.
MRPI Indicated Rod on Bottom d.
Annunciator F-30, OPaT TURBINE RUNBACK, or e.
Annunciator F-31, OTaT TURBINE RUNBACK.
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AP-TURB. 2 TITLE:
AUTOMATIC TURBINE RUNBACK REV 8
PAGE 3 of 10.
STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED CAUTION IF, AT ANY TIME DURING THIS PROCEDURE, A REACTOR TRIP OCCURS, E>>O, REACTOR TRIP OR SAFETY INJECTION, SHALL BE PERFORMED.
NOTE:
o Step 1 and 2 are IMMEDIATE ACTION steps.
o Any runback signal will block auto out motion of rod control system.
O 1
Check Rod Control:
o Rod control bank selector switch
- IN AUTO Place rod control bank selector switch in manual and drive rods. in as required.
o Control rods - STEPPING IN AS REQUIRED O
2 Check Turbine Load DECREASING Place EH in manual and decrease turbine load as necessary.
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AP-TURB. 2 TITLE:
AUTOMATIC TURBINE RUNBACK REV:
8 PAGE 4 of 10 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED NOTE:
Vith a PR lover detector failed low, the plant could experience both a dropped rod turbine runback with continuing aT runbacks.
3 Establish Cause Of Turbine Runback:
a.
Check for dropped rod runback:
o Annunciator AR-E28, power range rod drop rod stop-5X/5 sec alarm - LIT
-OR-o Any PR channel
- INDICATING SIGNIFICANTLY LESS THAN THE OTHER 3 CHANNELS a.
Check for delta T runback:
o Annunciator AR-F30, OPAT TURBINE RUNBACK alarm - LIT.
-OR-o Annunciator AR-F31, OTaT TURBINE RUNBACK alarm - LIT.
-OR-
-OR-o Annunciator AR-C14, ROD BOTTOM ROD STOP alarm (AR-C14) - LIT
-OR-o Any delta T within 1.71 F of OP or OP setpoint.
Go to Step 8.
o MRPI Indicates - ROD ON BOTTOM 4 Verify Turbine Load Reduction AT LEAST 204 Place EH in manual and reduce load by 20X.
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AP-TURB.2 AUTOMATIC TURBINE RUNBACK REV 8
PAGE 5 of 10 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 5 Verify Steam Dump Armed And Operating If Required:
o Annunciator G-15, steam dump alarm - LIT o
Steam dump valves operating as necessary
- TO CONTROL TAVG WITHIN +6'F OF TREF Operate steam dump'anually:
- a. Place steam dump mode selector to MANUAL.
- b. Place S/G cond stm dump HCV-484 controller to MANUAL.
c.
Open steam dump valves as required to stabilize Tavg within +6'F of Tref.
6 Establish That Stable Plant Conditions Are Being Achieved:
- a. Tavg - TRENDING TO TREF b.
PRZR pressure
- TRENDING TO 2235 PSIG c.
PRZR level - TRENDING TO PROGRAM
- a. Insert control rods or, if necessary, decrease turbine load to match Tavg to Tref.
- b. Verify proper operation of PRZR heaters and spray or take manual control of PC-431K.
- c. Verify proper operation of charging pump speed controllers or take manual control of speed controllers to control PRZR level.
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AP-TURB. 2 TIILE:
AUTOMATIC TURBINE RUNBACK REV 8
PAGE 6 of 10 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 7
Check NIS PR Indication Normal And No Control Or Shutdown Rods Dropped:
a.
PR detectors total output - NOT FAILED LOW b.
PR lover detector
- NOT FAILED LOW
- a. Refer to ER-NIS.3, PR MALFUNCTION.
- b. IF PR lower detector has failed lov, THEN:
- 1) Allov runback to reduce reactor pover to 75X.
- 2) Place EH in manual to terminate the runback.
- 3) Refer to ER-NIS.3, PR MALFUNCTION.
c.
PR upper detector
- NOT FAILED LOW
- c. Refer to ER-NIS.3, PR MALFUNCTION.
- d. Annunciator AR-C14, ROD BOTTOM ROD STOP alarm - EXTINGUISHED e.
Go to Step 12 d.
Go to AP-RCC.2, RCC/RPI MALFUNCTION.
NOTE:
Tavg will indicate high or lov for some instrument failures affecting steam dump control, rod control, and PRZR level control.
8 Verify Adequate Turbine Load Reduction:
o EH setter and turbine load-DECREASING Place EH control in manual and reduce turbine load until high delta T condition clears.
-OR-o Turbine runback signal - CLEARED
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AP-TURB.2 AUTOMATIC TURBINE RUNBACK REV:
8 PAGE 7 of 10 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 9 Verify Steam Dump Armed And Operating:
o Annunciator G-15, steam dump alarm - LIT o
Steam dump valves operating as necessary
- TO CONTROL TAVG VITHIN +6'f OF TREF Perform the following:
- a. Place steam dump mode selector to MANUAL.
- b. Place'S/G cond stm dump HCV-484 controller to MANUAL c.
Open steam dump valves as required to stabilize Tavg within +6'F of Tref.
10 Check NIS PR Indication Normal:
o PR upper detector
- NOT FAILED HIGH IF NIS PR upper detector has failed
- high, THEN:
- a. Allow runback to reduce reactor power to 75X.
- b. Place EH in manual to terminate runback.
- c. Defeat failed PR channel (Refer to ER-NIS.3, PR MALFUNCTION).
d.
Go to Step 12.
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AP-TURB.2 TITLE:
AUTOMATIC TURBINE RUNBACK REV:
8 PAGE 8 of 10 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED NOTE:
aT vill indicate high for some instrument failures affecting the rod insertion limit (RIL) calculation and give RIL alarms when none are warranted.
11 Check And Compare All Delta T Channels:
o All 4 delta T channels actual aT and hT setpoint
- INDICATING APPROXIMATELY THE SAME VALUE o All 4 delta T channels-RESPONDING TO THE TURBINE RUNBACKS Perform the folloving:
a.
Check for instrument failure:
r o
1 delta T channel indicating significantly different than other 3 and not responding to turbine runback.
o Any PRZR pressure or Tavg channel malfunction.
- b. IF 1 channel is failed, THEN:
'-')
Allov runback to reduce reactor pover to 75X.
- 2) Place EH in manual to terminate runback.
- 3) Defeat failed channel (Refer to ER-INST.l, REACTOR PROTECTION BISTABLE DEFEAT AFTER INSTRUMENTATION LOOP FAILURE).
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AP,TURB. 2 TITLE:
AUTOMATIC TURBINE RUNBACK REV:
8 PAGE 9 of 10 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED CAUTION IF STEAM DUMP CONTINUES FOR A SIGNIFICANT LENGTH OF TIME, CONDENSATE TEMPERATURE AND CONDENSER BACK PRESSURE SHOULD BE MONITORED.
NOTE:
Tavg will indicate high or low for some instrument failures affecting steam dump control, rod control, and PRZR level control.
12 Establish Stable Plant Conditions:
Perform the following:
- a. Tavg - TRENDING TO TREF b.
PRZR pressure
- TRENDING TO 2235 PSIG c.
PRZR level - TRENDING TO PROGRAM d.
Steam dump valves - CLOSED e.
Rod insertion limit alarms-EXTINGUISHED
- a. Insert control rods or, if necessary decrease turbine load to match Tavg to Tref.
- b. Verify proper operation of PRZR heaters and spray or take manual control of PRZR press controller 431K.
- c. Verify proper operation of charging pump speed controllers OR take manual control of speed controllers to control PRZR level.
- e. Verify proper operation of rod control system.
Refer to AP-CVCS.2, IMMEDIATE BORATION.
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AP-TURB.2 TITLE:
AUTOMATIC TURBINE RUNBACK REV 8
PAGE 10 of 10 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 13 Check For Guidance After Runback Has Terminated REFER TO 0 5g LOAD VARIATIONS 14 Check With Higher Supervision TO OBTAIN APPROVAL PRIOR TO INCREASING TURBINE LOAD
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