ML17263A259
| ML17263A259 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 04/21/1993 |
| From: | Marlow T ROCHESTER GAS & ELECTRIC CORP. |
| To: | |
| Shared Package | |
| ML17263A255 | List: |
| References | |
| AP-RCC.2, NUDOCS 9305140020 | |
| Download: ML17263A259 (16) | |
Text
EOP:
AP-RCC.2 TlTLE:
RCC/RPI MALFUNCTION REV:
5 PAGE 1 of 8 ROCHESTER GAS AND ELECTRIC CORPORATION GINNA STATION CONTROLLED COPY NUMBER TECHNICAL REVIEW PORC REVIEW DATE
(
W/l~
P T SUPERINTENDENT EFFECTIVE DATE CATEGORY 1.0 REVIEWED BY:
9305140020 930505 PDR ADGCK 05000244 F
EOP:
AP-RCC.2 RCC/RPI MALFUNCTION REV'
- PAGE, 2 of 8 A.
PURPOSE This procedure provides the steps necessary to continue plant operation while investigating an RCC/RPI malfunction.
B.
ENTRY CONDITIONS/SYMPTOMS 1.
SYMPTOMS The symptoms of RCC/RPI MALFUNCTION are; a.
Annunciator C-5, PPCS ROD SEQUENCE OR ROD DEVIATION lit, or b.
Power range NIS indicate a flux tilt, or c.
Group step counters for any individual bank are not within 1 step of each other, or d.
Incore flux map indicates abnormal flux tilt, or e.
Incore thermocouples indicate abnormal power tilt, or f.
Individual rods are not within +/- 12 steps of their respective step counters as indicated on MRPI, or g.
Annunciator F-29, PPCS AXIAL OR RADIAL OR QUADRANT POWER TILT, lit, or, h.
Annunciator C-29, MRPI SYSTEM FAILURE.
EOP:
AP-RCC.2 TITLE:
RCC/RPI MALFUNCTION REV:
5 PAGE 3 of 8 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED
- * * * * * * * * * * * *
- 4 * * * * * * * * * * * * * * * * * * * * * * * * *
- CAUTION IF AT ANY TIME DURING THIS PROCEDURE, A REACTOR TRIP OR SI OCCURS, E-O, REACTOR TRIP OR SAFETY INJECTION, SHALL BE PERFORMED.
1 Place Rod Control Bank Selector Switch TO MANUAL CAUTION o
BANK ROD WITHDRAWAL SHOULD NOT BE PERFORMED UNTIL THE MISALIGNED ROD IS RECOVERED.
o UNTIL THE MRPI SYSTEM IS KNOWN TO BE AT FAULT, A ROD INDICATING GREATER THAN 2 12 STEPS FROM ITS GROUP STEP COUNTER SHOULD BE CONSIDERED A MISALIGNED ROD.
2 Check Dropped Rod Indication:
o Annunciator E-28, POWER RANGE ROD DROP ROD STOP 5%/5 SECONDS EXTINGUISHED IF MRPI indicates a rod is on the
- bottom, THEN go to AP-RCC.3, DROPPED ROD RECOVERY.
o Annunciator C-14, ROD BOTTOM ROD STOP
- EXTINGUISHED
EOP:
AP-RCC.2 TITLE:
RCC/RPI MALFUNCTION REV:
5 PAGE 4 of 8 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 3
Check Control Rod Alignment:
- a. Verify all rods in affected group
- WITHINi 12 STEPS OF ASSOCIATED GROUP STEP COUNTER b.
Go to Step 6
,a. IF only one rod misaligned from associated group step counter, THEN go to Step 4
~
IF two or more rods misaligned from associated group step
- counters, THEN be in HSD within six hours (Refer to 0-2.1, NORMAL SHUTDOWN TO HOT SHUTDOWN).
NOTE:
Step 4 is an attempt to determine whether a rod is misaligned or whether the MRPI System is malfunctioning.
4 Check QPTR LESS THAN 1.02 IF QPTR greater than 1.02, THEN computer value should be verified using 0-6.4 to prevent action based on failed computer inputs.
NOTE:
The incore flux mapping system may aid in evaluating rod alignment depending on rod location.
5 Evaluate Control Rod Operability:
- a. Verify adequate shutdown margin (Refer to 0-3.2, SHUTDOWN MARGIN FOR AN OPERATING REACTOR)
- b. Direct I&C to locally investigate rod failure c.
Rod failure identified and corrected
- MISALIGNED ROD MOVEABLE d.'estore misaligned rod (Refer to ER-RCC.2, RESTORING A MISALIGNED ROD)
- a. Borate and reduce turbine load as necessary.
- c. Consult Reactor Engineer and Tech Spec 3.10 '.3 for operational concerns
EOP:
AP-Rcce2 RCC/RPI MALFUNCTION REV:
5 PAGE 5 of 8 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 6 Verify Affected Group Step Counters Operable:
- a. Affected bank group step counter movement
- CONSISTANT WITH MRPI TRANSITIONS (Evaluate affected bank using PT-1, ROD CONTROL SYSTEN)
IF both step counters in any individual bank are inoperable, THEN perform the following:
o,Restore step counters to operable within one hour
-OR-b.
Group step counters for affected bank
- WITHIN 1 STEP OF EACH OTHER o
Be in HSD within the following six hours IF only one group step counter per individual bank ia inoperable, THEN perform the following:
o Verify that MRPI for each rod of affected bank is operable and rods of the affected bank are at the same indicated position at least once per 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.
-OR-o Reduce power to less than 50% of rated power within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.
EOP:
AP-RCC.2 TITLE:
RCC/RPI MALFUNCTION REV:
5 PAGE 6 of 8 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED NOTE:
IF the MRPI CRT fails, THEN the PPCS can be used for rod position indication until the CRT is made operable.
Rod position indication can be retrieved from the PPCS using the blue CBAW key.
7 Verify All Individual Rod Position Indication Per Bank Operable:
o MRPI system NO MRPI SYSTEM ALARMS o
MRPI system NO KNOWN PROBLEMS WITH MRPI SYSTEM THAT COULD RENDER ROD POSITION INDICATION INOPERABLE IF two or more individual rod position indications per bank are inoperable, THEN perform the following:
o Restore inoperable individual rod position indications to operable within one hour.
-OR-o Be in HSD within the following six hours.
IF only one rod position indication per bank is inoperable, THEN perform the following:
o Once per 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />, determine the affected rod position using moveable incore detection system and after motion of the non-indicating rod exceeding 24 steps in one direction.
-OR-o Reduce power to less than 508 of rated power within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />,
s)
EOP:
AP-RCC.2 RCC/RPI MALFUNCTION REV' PAGE 7 of 8 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED 8
Establish Stable Plant Conditions:
a.
Tavg - TRENDING TO TREF b.
PRZR pressure
- TRENDING TO 2235 PSIG
- 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 pressure controller 431K.
IF pressure can NOT be controlled, THEN refer to AP-PRZR.1, ABNORMAL PRESSURIZER PRESSURE.
c.
PRZR level
- TRENDING TO PROGRAM
- c. Verify proper operation of charging pump speed controllers or take manual control of speed controllers to control PRZR level.
d.
Rod insertion limit alarms-EXTINGUISHED e.
NIS PR AI - WITHIN 2 5%
OF TARGET VALUE
- d. Borate as necessary and withdraw control rods to clear insertion limit alarms (refer to affected rod bank alarm response procedures if necessary).
- e. Borate/dilute to restore hl to within limits.
9 Evaluate Plant Conditions:
a.
Rod/MRPI malfunction - REPAIRED
- b. Verify, control rod operability-OPERABILITY RESTORED (Refer to PT-1, ROD CONTROL SYSTEM)
L
- a. Return to Step 4.
- b. Refer to Tech Spec section 3.10 and consult plant staff for further guidance.
EOP t AP-RCC.2 TITLE:
RCC/RPI MALFUNCTION REV:
5 PAGE 8 of 8 STEP ACTION/EXPECTED RESPONSE
RESPONSE
NOT OBTAINED NOTE:
Refer to 0-9.3, NRC IMMEDIATE NOTIFICATION, for reporting requirements.
10 Notify Higher Supervision 11 Return To Procedure Or Guidance In Effect
-END-
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