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| issue date = 11/20/2009
| issue date = 11/20/2009
| title = 2009-11 - Post Examination Comments
| title = 2009-11 - Post Examination Comments
| author name = Weber T N
| author name = Weber T
| author affiliation = Arizona Public Service Co
| author affiliation = Arizona Public Service Co
| addressee name = Garchow S M
| addressee name = Garchow S
| addressee affiliation = NRC/RGN-IV
| addressee affiliation = NRC/RGN-IV
| docket = 05000528, 05000529, 05000530
| docket = 05000528, 05000529, 05000530
Line 16: Line 16:


=Text=
=Text=
{{#Wiki_filter:10 CFR 55.31 Thomas N. Weber Mail Station 7636 Palo Verde Nuclear Department Leader Tel. 623-393-5764 PO Box 52034 Generating Station Regulatory Affairs Fax 623-393-5442 Phoenix, Arizona 85072-2034 102-06097-TNW/RAS/FJO November 20, 2009 Mr. S. M. Garchow Chief Examiner, Region IV U.S. Nuclear Regulatory Commission 612 E. Lamar Blvd., Suite 400 Arlington, TX 76011-4125  
{{#Wiki_filter:10 CFR 55.31 Thomas N. Weber                                 Mail Station 7636 Palo Verde Nuclear           Department Leader   Tel. 623-393-5764           PO Box 52034 Generating Station           Regulatory Affairs Fax 623-393-5442             Phoenix, Arizona 85072-2034 102-06097-TNW/RAS/FJO November 20, 2009 Mr. S. M. Garchow Chief Examiner, Region IV U.S. Nuclear Regulatory Commission 612 E. Lamar Blvd., Suite 400 Arlington, TX 76011-4125


==Dear Mr. Garchow:==
==Dear Mr. Garchow:==


==Subject:==
==Subject:==
Palo Verde Nuclear Generating Station (PVNGS) Units 1,2 and 3 Docket Nos. STN 50*528/529/530 2009 Reactor Operator and Senior Reactor Operator Written Examination Results Arizona Public Service Company (APS) management has completed its review of the operator examination conducted November 6, 2009, thru November 13, 2009. The required examination documents referenced in NUREG 1021, Rev 9, Supplement 1, Section ES-501 (C.1.a) were hand-delivered or sent electronically to the chief examiner, with one exception.
Palo Verde Nuclear Generating Station (PVNGS)
APS will forward the original Form(s) ES-201-3, "Examination Security Agreement," with the appropriate pre-and post-examination signatures by December 15, 2009. This will allow time for APS to obtain signatures from the individuals who had detailed knowledge of any part of the operating tests or written examination.
Units 1,2 and 3 Docket Nos. STN 50*528/529/530 2009 Reactor Operator and Senior Reactor Operator Written Examination Results Arizona Public Service Company (APS) management has completed its review of the operator examination conducted November 6, 2009, thru November 13, 2009.
There are no commitments made to the NRC by this letter. Please call Mr. Warren Potter, Department Leader Nuclear Training, at (623) 393-6165, if you have questions or require additional information.
The required examination documents referenced in NUREG 1021, Rev 9, Supplement 1, Section ES-501 (C.1.a) were hand-delivered or sent electronically to the chief examiner, with one exception. APS will forward the original Form(s)
Sincerely, TNW/FJO/gat cc: E. E. Collins NRC Region IV Regional Administrator L. A. Hurley NRC Region IV, Licensing Assistant, Operations Branch J. R. Hall NRC NRR Project Manager (send electronic and paper) R. I. Treadway NRC Senior Resident Inspector for PVNGS A member of the STARS (Strategic Teaming and Resource Sharing)
ES-201-3, "Examination Security Agreement," with the appropriate pre- and post-examination signatures by December 15, 2009. This will allow time for APS to obtain signatures from the individuals who had detailed knowledge of any part of the operating tests or written examination.
Callaway
There are no commitments made to the NRC by this letter.
Please call Mr. Warren Potter, Department Leader Nuclear Training, at (623) 393-6165, if you have questions or require additional information.
Sincerely, TNW/FJO/gat cc:     E. E. Collins           NRC Region IV Regional Administrator L. A. Hurley           NRC Region IV, Licensing Assistant, Operations Branch J. R. Hall             NRC NRR Project Manager (send electronic and paper)
R. I. Treadway         NRC Senior Resident Inspector for PVNGS A member of the STARS (Strategic Teaming and Resource Sharing) Alliance Callaway
* Comanche Peak
* Comanche Peak
* Diablo Canyon
* Diablo Canyon
Line 31: Line 34:
* San Onofre
* San Onofre
* South Texas
* South Texas
* Wolf Exam Review SROQ2 SRO Q15 ROQl3 ROQ25 ROQ50 ROQ61 i Examinee many Question I would have picked the correct answer "c" if it had said go to the SPTAs rather than LOOP Aren't both answers A and B correct? If you take into account the allowed 3% blowdown then pressure could drop as low as 1212 psig. This would relate to 570 degrees, which is less than the 572 stated in the answer. If! had failed fuel wouldn't D I (high activity in the Letdown Heat Exchanger area) be true. Why is Battery breaker open a wrong answer? Per the LOCA SFSCs if all available All available Recombiners are in operation and H2 levels are < 4.5% then the safety Function is met. Given this I think that answer "C" (no action required unless hydrogen concentration approaches 4%) is also correct. Answer You have to go perform the SPT As prior to proceeding to an EOP. No change to the key. Recommendation:
* Wolf Creek
No Change We agree this is being submitted to the NRC for review. Recommendation:
 
Accept both A and B as correct With full MSSV blowdown there may be a short time when temperature is lower but the expected response would be temperatures close to the MSSV setpoint.
Exam Review Con1lllents Examinee                 Question                             Answer SROQ2                I would have picked the correct     You have to go perform the i            answer "c" if it had said go to the SPTAs prior to proceeding to an SPTAs rather than LOOP              EOP. No change to the key.
The SBCS comes back in manual with 0 output due to the given conditions, therefore without Operator action 564 degrees is wrong. Recommendation:
Recommendation: No Change SRO Q15  many      Aren't both answers A and B        We agree this is being submitted correct?                            to the NRC for review.
No Change Yes, but this is not the purpose on the this monitor. We will consider submitting this change. Recommendation:
Recommendation: Accept both A and B as correct ROQl3                If you take into account the        With full MSSV blowdown there allowed 3% blowdown then            may be a short time when pressure could drop as low as      temperature is lower but the 1212 psig. This would relate to    expected response would be 570 degrees, which is less than the temperatures close to the MSSV 572 stated in the answer.          setpoint. The SBCS comes back in manual with 0 output due to the given conditions, therefore without Operator action 564 degrees is wrong.
No Change It is not, this question is being submitted to the NRC for review. Recommendation:
Recommendation: No Change ROQ25                If! had failed fuel wouldn't D      Yes, but this is not the purpose on I (high activity in the Letdown Heat  the this monitor. We will consider Exchanger area) be true.            submitting this change.
Accept both A and B as correct The procedure requires actions to be taken if H2 is greater than 0.7%. No Recombiners available does not meet the requirement of all available Recombiners are operating.
Recommendation: No Change           I ROQ50                Why is Battery breaker open a      It is not, this question is being wrong answer?                        submitted to the NRC for review.
Recommendation:
Recommendation: Accept both A and B as correct ROQ61                Per the LOCA SFSCs if all            The procedure requires actions to available All available            be taken if H2 is greater than Recombiners are in operation and    0.7%. No Recombiners available H2 levels are < 4.5% then the        does not meet the requirement of safety Function is met. Given this  all available Recombiners are I think that answer "C" (no action  operating.
No Change I II SRO Question 15 deletion proposal Due to two answers containing conflicting information that the examinees were exposed to during the LOIT program, Palo Verde suggests that question 15 of the 2009 SRO Initial License exam be deleted from the exam per ES-403 D.1.c. The conflicting answers are: Answer "A" states; "only A02C is running " Answer "B" states; "A02B will start after a 120 second time delay...." This became apparent during the exam review process as well as interviews with the SRO examinees.
required unless hydrogen concentration approaches 4%) is Recommendation: No Change also correct.
Interviews with candidates showed that ofthe 8 SRO candidates, 4 chose answer "B", 3 chose answer "A", and one candidate chose "D". All 4 candidates that chose answer "B" stated the referenced alarm response as justification for there answer. The conflicting information is contained in the Alarm Response Procedure 9RK7A, Panel B07A Alarm Response Procedure, Window 9B). The Alarm Response states the following:
II
* The Standby CEDMAir Cooling Fan starts after a Reset Time Delay. This conflicts with the next sentence in the Alarm Response Procedure: Backdraft dampers have been installed to allow any single CEDM Cooling F an to provide sufficient cooling. . In addition to the above, the following statement is also include on the same page of the Alarm Response procedure: IF the loss of one CEDM Fan in a CEDM ACU causes DP to fall below the auto start set point, OR the loss of two CEDM Fans in one CEDM ACU causes DP to fall below the auto start set point, THEN the standby CEDM Air Cooling Unit should auto start:.... Engineering was consulted to determine the correct answer based on the question.
 
The initial response from the system engineers was also in conflict.
SRO Question 15 deletion proposal Due to two answers containing conflicting information that the examinees were exposed to during the LOIT program, Palo Verde suggests that question 15 of the 2009 SRO Initial License exam be deleted from the exam per ES-403 D.1.c.
The next step was to verify the response ofthe unit simulator.
The conflicting answers are:
It was verified that the simulator does not model the low DIP start function.
* Answer "A" states; "only A02C is running         "
Auto starts are triggered by other means.
* Answer "B" states; "A02B will start after a 120 second time delay...."
40AL-9RK7A Panel B07A Alarm Responses Rev. 4 7A09B Page 125 of 142 CEOM ACU COOL SYS TRBL Page 10 of 12 PT 10 HCYS49 HCYS50 RESPONSE SECTION GROUp E POSSIBLE CAUSE CEDM ACU A Fan A Elect Prot CEDM ACU A Fan C Elect Prot CEDM ACU B Fan B Elect Prot CEDM ACU B Fan D Elect Prot SETPOINT N/A N/A N/A N/A AUTO ACTION __ 1. The breaker for the affected CEDIVI ACU will trip and the fan will stop. NOTE The Standby CEDM Air Cooling Fan starts after a Reset Time Delay. Backdraft dampers have been installed to allow any single CEDM Cooling Fan to provide sufficient cooling. __ 2. IF the loss of one CEDM Fan in a CEDM ACU causes DP to fall below the auto start set point, OR the loss of two CEDM Fans in one CEDM ACU causes DP to fall below the auto start set point, THEN the standby CEDM Air Cooling Unit should auto start:
This became apparent during the exam review process as well as interviews with the SRO examinees.
Interviews with candidates showed that ofthe 8 SRO candidates, 4 chose answer "B", 3 chose answer "A", and one candidate chose "D". All 4 candidates that chose answer "B" stated the referenced alarm response as justification for there answer.
The conflicting information is contained in the Alarm Response Procedure (40AL 9RK7A, Panel B07A Alarm Response Procedure, Window 9B). The Alarm Response states the following:
* The Standby CEDMAir Cooling Fan starts after a Reset Time Delay.
This conflicts with the next sentence in the Alarm Response Procedure:
* Backdraft dampers have been installed to allow any single CEDM Cooling Fan to provide sufficient cooling.             .
In addition to the above, the following statement is also include on the same page of the Alarm Response procedure:
* IF the loss of one CEDM Fan in a CEDM ACU causes DP to fall below the auto start set point, OR the loss of two CEDM Fans in one CEDM ACU causes DP to fall below the auto start set point, THEN the standby CEDM Air Cooling Unit should auto start: ....
Engineering was consulted to determine the correct answer based on the question. The initial response from the system engineers was also in conflict.
The next step was to verify the response ofthe unit simulator. It was verified that the simulator does not model the low DIP start function. Auto starts are triggered by other means.
 
40AL-9RK7A     Panel B07A Alarm Responses           Rev. 4 7A09B CEOM ACU COOL SYS TRBL                     Page 10 of 12   Page 125 of 142 RESPONSE SECTION GROUp E PT 10                      POSSIBLE CAUSE                           SETPOINT HCYS49        CEDM   ACU A Fan A Elect Prot                         N/A CEDM   ACU A Fan C Elect Prot                         N/A HCYS50        CEDM   ACU B Fan B Elect Prot                         N/A CEDM   ACU B Fan D Elect Prot                         N/A AUTO ACTION
_ _ 1. The breaker for the affected CEDIVI ACU will trip and the fan will stop.
NOTE The Standby CEDM Air Cooling Fan starts after a Reset Time Delay. Backdraft dampers have been installed to allow any single CEDM Cooling Fan to provide sufficient cooling.
_ _ 2. IF the loss of one CEDM Fan in a CEDM ACU causes DP to fall below the auto start set point, OR the loss of two CEDM Fans in one CEDM ACU causes DP to fall below the auto start set point, THEN the standby CEDM Air Cooling Unit should auto start:
* HCA-HS-49, CEDM ACU FANS A/C A02A/A02C amber light on.
* HCA-HS-49, CEDM ACU FANS A/C A02A/A02C amber light on.
* HCB-HS-50, CEDM ACU FANS B/D A02B/A02D amber light on. (continued) 50 EXAMINATION ANSWER 2009 Reactor Operator Exam 10:Q19151 Points: 1.00 Given the following B01 indications:
* HCB-HS-50, CEDM ACU FANS B/D A02B/A02D amber light on.
(continued)
 
EXAMINATION ANSWER KEY 2009 Reactor Operator Exam 50                                        10:Q19151                       Points: 1.00 Given the following B01 indications:
Which one of the following conditions is indicated?
Which one of the following conditions is indicated?
A. The "A" PK train is in a normal alignment.
A.     The "A" PK train is in a normal alignment.
B. The "A" Battery output breaker has tripped. C. The "A" Battery charger output breaker has tripped. D. The "A" Battery charger AC supply voltage has been lost. Answer: A Page: 32 of 48 11/04/09
B.     The "A" Battery output breaker has tripped.
------
C.     The "A" Battery charger output breaker has tripped.
.---------------
D.     The "A" Battery charger AC supply voltage has been lost.
I &deg; I ALA I 1 00 T OVERRIDE -.--! ---CURRE _ -------------R--M-I TIME STATUS RUN I COMP REMOTES REMO ES..J - 00
Answer:         A Page: 32 of 48                       11/04/09
_' RS MAlFS MAlFS ----- 00 _ __ ._ ??F? c, PSIA SCENARIOS:
 
TRIGGE  0 pzr P"" " ME I RUN TIME  I aa I aa
                                                                                                    &deg;
__ XENON ?fiRS CLOCK TI : 0 1. __.tJ... . ; :,-Avg ')31 I Deg F 
                                                                    .----------------------------R--M-I I      I ALA       I------  00--------STAT*U-S---
TIME1STATUS          RUN CLOCK TI ME I RUN TIME
:            0    1.'-~__.tJ...
SCENARIOS:' TRIGGE RS I
                                              .MAlFS I
a a ;I  ~:,- _~___
COMP a a ----
MAlFS REMOTES Avg ')31 0-I
__~~ ~ -~
Deg F XENON          00
                                                                                              ?fiRS "-~;-M~__
REMO T ES..J OVERRIDE
                                                                                              -              -0.0--!
pzr P""
                                                                                                                      ~~~:~ " c,
                                                                                                                        ??F?    PSIA
                                                                                                                                      ~~CURRE  _ ~~ _
 
1----------------------------------------------------------------------------------
LOCK T ME I RUN TIME I SCENARIOS ~ TRIGGERS I MALFS    I ~~~~~ REMOTES I R~~~~ES. IOVE~~IDESI ~~6~ TIME STATUS    t                      STR'UTNUS I                                  I                                                                            100 08 17 08    i 21 25 02    0      I    0        00        0 a            0      I G    I   0 0      I 0 0      SNAP Ie          CURREfr Ie 20 Power  (In fl  Pet  Boron III t> FPM  T Cold bbU 0 Deg r    T r,vg tolJ ( I Deg f  X~NON  -nnr; 7 I'LM  Prr Pre$s  ?~'f)? Cj PSIA


LOCK T ME I RUN TIME I SCENARIOS  TRIGGERS I MALFS I REMOTES I I
The only change between breaker closed and breaker open is that charger amps drop by 10 amps due to losing the trickle charge to the "A" battery.
TIME STATUS STR'UTNUS t I I 100 08 17 08 i 21 25 02 0 I 0 00 0 a 0 I G I 0 0 I 00 SNAP Ie CURREfr Ie 20 Power (In fl Pet Boron III t> FPM T Cold bbU 0 Deg r T r,vg tolJ ( I Deg f
-nnr; 7 I'LM Prr Pre$s Cj PSIA The only change between breaker closed and breaker open is that charger amps drop by 10 amps due to losing the trickle charge to the "A" battery.


The below table includes all of the control room indicators for this system in the left hand column. The right hand column provides the transmitters (with corresponding grid locations) that supply a signal to the indicators.
The below table includes all of the control room indicators for this system in the left hand column.
INDICATOR RANGE TRANSMITTER 125V DC BUSA 0-150 DC This meter indicates voltage on panel M41, PKA-EI-M41 VOLTS associated with the "A" Battery Bus. This indicator and associated voltmeter can be found on 01-E-PKA-002 at G-8. Each PK bus has the same indication, using separate meters. 125 V BATTERY A 1500-0-1500 This meter indicates current from the "A" PKA-II-M4102 DC AMPS Battery to/from PKA-M41. This indicator and associated transmitter can be found on PKA-002 at G-7. Each PK bus has the same indication, using separate meters. BA rrERY CHARGER A PKA-EI-M4104 0-150 DC VOLTS This meter indicates voltage coming from Battery Charger A. This indicator and associated voltmeter can be found on PKA-002 at G-7. Each PK Battery Charger has the same indication, using separate meters. BATTERY CHARGER A PKA-II-M4104 0-500 DC AMPS This meter indicates current coming from Battery Charger A. This indicator and associated ammeter can be found on PKA-002 at G-7. Each PK Battery Charger has the same indication, using separate meters. I CHGRAC OUTPUT TO PKA-M41 RED/GREEN light Single light that indicates which DC bus is being supplied by its associated swing charger. Light is located on B01 below its associated Class Battery meters. If light is RED, then the indicated Class bus is being supplied.
The right hand column provides the transmitters (with corresponding grid locations) that supply a signal to the indicators.
If the light is GREEN, the bus is not being supplied.}}
INDICATOR                 RANGE                         TRANSMITTER 125V DC BUSA               0- 150 DC     This meter indicates voltage on panel M41, PKA-EI-M41                 VOLTS       associated with the "A" Battery Bus. This indicator and associated voltmeter can be found on 01-E-PKA-002 at G-8.
Each PK bus has the same indication, using separate meters.
125 V BATTERY A             1500-0-1500 This meter indicates current from the "A" PKA-II-M4102               DC AMPS       Battery to/from PKA-M41. This indicator and associated transmitter can be found on 01-E PKA-002 at G-7.
Each PK bus has the same indication, using separate meters.
BArrERY CHARGER A               0-150 DC     This meter indicates voltage coming from PKA-EI-M4104                VOLTS        Battery Charger A. This indicator and associated voltmeter can be found on 01-E PKA-002 at G-7.
Each PK Battery Charger has the same indication, using separate meters.
BATTERY CHARGER A               0-500 DC     This meter indicates current coming from PKA-II-M4104                AMPS        Battery Charger A. This indicator and associated ammeter can be found on 01-E PKA-002 at G-7.
Each PK Battery Charger has the same indication, using separate meters.
CHGRAC                 RED/GREEN Single light that indicates which DC bus is OUTPUT TO                    light      being supplied by its associated swing PKA-M41                                charger. Light is located on B01 below its associated Class Battery meters.
If light is RED, then the indicated Class bus is being supplied. If the light is GREEN, the bus is not being supplied.
I}}

Latest revision as of 07:00, 12 March 2020

2009-11 - Post Examination Comments
ML093370156
Person / Time
Site: Palo Verde  Arizona Public Service icon.png
Issue date: 11/20/2009
From: Weber T
Arizona Public Service Co
To: Garchow S
NRC Region 4
References
102-06097-TNW/RAS/FJO
Download: ML093370156 (12)
v • d • e


Text

10 CFR 55.31 Thomas N. Weber Mail Station 7636 Palo Verde Nuclear Department Leader Tel. 623-393-5764 PO Box 52034 Generating Station Regulatory Affairs Fax 623-393-5442 Phoenix, Arizona 85072-2034 102-06097-TNW/RAS/FJO November 20, 2009 Mr. S. M. Garchow Chief Examiner, Region IV U.S. Nuclear Regulatory Commission 612 E. Lamar Blvd., Suite 400 Arlington, TX 76011-4125

Dear Mr. Garchow:

Subject:

Palo Verde Nuclear Generating Station (PVNGS)

Units 1,2 and 3 Docket Nos. STN 50*528/529/530 2009 Reactor Operator and Senior Reactor Operator Written Examination Results Arizona Public Service Company (APS) management has completed its review of the operator examination conducted November 6, 2009, thru November 13, 2009.

The required examination documents referenced in NUREG 1021, Rev 9, Supplement 1, Section ES-501 (C.1.a) were hand-delivered or sent electronically to the chief examiner, with one exception. APS will forward the original Form(s)

ES-201-3, "Examination Security Agreement," with the appropriate pre- and post-examination signatures by December 15, 2009. This will allow time for APS to obtain signatures from the individuals who had detailed knowledge of any part of the operating tests or written examination.

There are no commitments made to the NRC by this letter.

Please call Mr. Warren Potter, Department Leader Nuclear Training, at (623) 393-6165, if you have questions or require additional information.

Sincerely, TNW/FJO/gat cc: E. E. Collins NRC Region IV Regional Administrator L. A. Hurley NRC Region IV, Licensing Assistant, Operations Branch J. R. Hall NRC NRR Project Manager (send electronic and paper)

R. I. Treadway NRC Senior Resident Inspector for PVNGS A member of the STARS (Strategic Teaming and Resource Sharing) Alliance Callaway

  • Comanche Peak
  • Diablo Canyon
  • Palo Verde
  • San Onofre
  • Wolf Creek

Exam Review Con1lllents Examinee Question Answer SROQ2 I would have picked the correct You have to go perform the i answer "c" if it had said go to the SPTAs prior to proceeding to an SPTAs rather than LOOP EOP. No change to the key.

Recommendation: No Change SRO Q15 many Aren't both answers A and B We agree this is being submitted correct? to the NRC for review.

Recommendation: Accept both A and B as correct ROQl3 If you take into account the With full MSSV blowdown there allowed 3% blowdown then may be a short time when pressure could drop as low as temperature is lower but the 1212 psig. This would relate to expected response would be 570 degrees, which is less than the temperatures close to the MSSV 572 stated in the answer. setpoint. The SBCS comes back in manual with 0 output due to the given conditions, therefore without Operator action 564 degrees is wrong.

Recommendation: No Change ROQ25 If! had failed fuel wouldn't D Yes, but this is not the purpose on I (high activity in the Letdown Heat the this monitor. We will consider Exchanger area) be true. submitting this change.

Recommendation: No Change I ROQ50 Why is Battery breaker open a It is not, this question is being wrong answer? submitted to the NRC for review.

Recommendation: Accept both A and B as correct ROQ61 Per the LOCA SFSCs if all The procedure requires actions to available All available be taken if H2 is greater than Recombiners are in operation and 0.7%. No Recombiners available H2 levels are < 4.5% then the does not meet the requirement of safety Function is met. Given this all available Recombiners are I think that answer "C" (no action operating.

required unless hydrogen concentration approaches 4%) is Recommendation: No Change also correct.

II

SRO Question 15 deletion proposal Due to two answers containing conflicting information that the examinees were exposed to during the LOIT program, Palo Verde suggests that question 15 of the 2009 SRO Initial License exam be deleted from the exam per ES-403 D.1.c.

The conflicting answers are:

  • Answer "A" states; "only A02C is running "
  • Answer "B" states; "A02B will start after a 120 second time delay...."

This became apparent during the exam review process as well as interviews with the SRO examinees.

Interviews with candidates showed that ofthe 8 SRO candidates, 4 chose answer "B", 3 chose answer "A", and one candidate chose "D". All 4 candidates that chose answer "B" stated the referenced alarm response as justification for there answer.

The conflicting information is contained in the Alarm Response Procedure (40AL 9RK7A, Panel B07A Alarm Response Procedure, Window 9B). The Alarm Response states the following:

  • The Standby CEDMAir Cooling Fan starts after a Reset Time Delay.

This conflicts with the next sentence in the Alarm Response Procedure:

  • Backdraft dampers have been installed to allow any single CEDM Cooling Fan to provide sufficient cooling. .

In addition to the above, the following statement is also include on the same page of the Alarm Response procedure:

  • IF the loss of one CEDM Fan in a CEDM ACU causes DP to fall below the auto start set point, OR the loss of two CEDM Fans in one CEDM ACU causes DP to fall below the auto start set point, THEN the standby CEDM Air Cooling Unit should auto start: ....

Engineering was consulted to determine the correct answer based on the question. The initial response from the system engineers was also in conflict.

The next step was to verify the response ofthe unit simulator. It was verified that the simulator does not model the low DIP start function. Auto starts are triggered by other means.

40AL-9RK7A Panel B07A Alarm Responses Rev. 4 7A09B CEOM ACU COOL SYS TRBL Page 10 of 12 Page 125 of 142 RESPONSE SECTION GROUp E PT 10 POSSIBLE CAUSE SETPOINT HCYS49 CEDM ACU A Fan A Elect Prot N/A CEDM ACU A Fan C Elect Prot N/A HCYS50 CEDM ACU B Fan B Elect Prot N/A CEDM ACU B Fan D Elect Prot N/A AUTO ACTION

_ _ 1. The breaker for the affected CEDIVI ACU will trip and the fan will stop.

NOTE The Standby CEDM Air Cooling Fan starts after a Reset Time Delay. Backdraft dampers have been installed to allow any single CEDM Cooling Fan to provide sufficient cooling.

_ _ 2. IF the loss of one CEDM Fan in a CEDM ACU causes DP to fall below the auto start set point, OR the loss of two CEDM Fans in one CEDM ACU causes DP to fall below the auto start set point, THEN the standby CEDM Air Cooling Unit should auto start:

  • HCA-HS-49, CEDM ACU FANS A/C A02A/A02C amber light on.
  • HCB-HS-50, CEDM ACU FANS B/D A02B/A02D amber light on.

(continued)

EXAMINATION ANSWER KEY 2009 Reactor Operator Exam 50 10:Q19151 Points: 1.00 Given the following B01 indications:

Which one of the following conditions is indicated?

A. The "A" PK train is in a normal alignment.

B. The "A" Battery output breaker has tripped.

C. The "A" Battery charger output breaker has tripped.

D. The "A" Battery charger AC supply voltage has been lost.

Answer: A Page: 32 of 48 11/04/09

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The only change between breaker closed and breaker open is that charger amps drop by 10 amps due to losing the trickle charge to the "A" battery.

The below table includes all of the control room indicators for this system in the left hand column.

The right hand column provides the transmitters (with corresponding grid locations) that supply a signal to the indicators.

INDICATOR RANGE TRANSMITTER 125V DC BUSA 0- 150 DC This meter indicates voltage on panel M41, PKA-EI-M41 VOLTS associated with the "A" Battery Bus. This indicator and associated voltmeter can be found on 01-E-PKA-002 at G-8.

Each PK bus has the same indication, using separate meters.

125 V BATTERY A 1500-0-1500 This meter indicates current from the "A" PKA-II-M4102 DC AMPS Battery to/from PKA-M41. This indicator and associated transmitter can be found on 01-E PKA-002 at G-7.

Each PK bus has the same indication, using separate meters.

BArrERY CHARGER A 0-150 DC This meter indicates voltage coming from PKA-EI-M4104 VOLTS Battery Charger A. This indicator and associated voltmeter can be found on 01-E PKA-002 at G-7.

Each PK Battery Charger has the same indication, using separate meters.

BATTERY CHARGER A 0-500 DC This meter indicates current coming from PKA-II-M4104 AMPS Battery Charger A. This indicator and associated ammeter can be found on 01-E PKA-002 at G-7.

Each PK Battery Charger has the same indication, using separate meters.

CHGRAC RED/GREEN Single light that indicates which DC bus is OUTPUT TO light being supplied by its associated swing PKA-M41 charger. Light is located on B01 below its associated Class Battery meters.

If light is RED, then the indicated Class bus is being supplied. If the light is GREEN, the bus is not being supplied.

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