IR 05000245/1985021
| ML20138P862 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 12/02/1985 |
| From: | Crescenzo F, Keller R, Kister H, Lange D NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | |
| Shared Package | |
| ML20138P850 | List: |
| References | |
| 50-245-85-21, NUDOCS 8512260308 | |
| Download: ML20138P862 (63) | |
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U. S. NUCLEAR REGULATORY COMMISSION REGION I OPERATOR LICENSING EXAMINATION REPORT EXAMINATION REPORT NO. 85-21 (0L) FACILITY DOCKET NO. 50-245 FACILITY LICENSE NO. DPR-21 LICENSEE: Northeast Utilities' Service Company P. O. Box 270 Hartford, Connecticut 06141-0270 FACILITY: Millstone Unit I EXAMINATION DATES: August 12 - 15, 1985 CHIEF EXAMINER: h @S U Frank Crescenzo a r Engineer (Examiner) 'Date REVIEWED BY:
(vid Lange, Lea EL/ ,
eactor Engineer (Examiner) M[EDate[[ [ REVIEWED BY: Y Robert M. Keller, Chief
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Date Projects Section 1C APPROVED BY: 2 ML //h /8f hr rry B. Kister, Chief oject Branch No. 1 Date SUMMARY: Written and ora: examinations were administered at Millstone Unit I the week of August 12, 1985. Six Reactor Operator and four Senior Reactor Operator candidates were examined. One Reactor operator candidate and one Senior Reactor Operator candidate failed both the written and oral examination DR ADOCK 050
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REPORT DETAILS-TYPE OF EXAMS: Replacement X EXAM RESULTS: l RO l SRO l l Pass / Fail l Pass / Fail l l 1 1 I I I I l Written Exam l 5/1 l 3/1 l l l l l l l l 1 l . Oral Exam l 5/1 l 3/1 l 1 I I I I- 1 I i l Overall l 5/1 l 3/1 l l l l l CHIEF EXAMINER AT SITE: Frank Crescenzo 2. OTHER EXAMINERS: Brian Hajek, Tom Morgan Summary of generic strengths or deficiencies noted on oral exams: Overall, the candidates performed well on the walkthrough; however, weaknesses were noted in knowledge of control systems i.e., MPR/EPR Turbine Control, Recirc Flow Contro . Personnel Present at Exit Interview: NRC Personnel Frank Crescenzo NRC Contractor Personnel Tom Morgan (EG&G, Idaho)
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1 Facility Personnel ] W..Romberg, Station Superintendent R.--Test, Director, Nuclear Training R. Palmeri, Operations Supervisor, Unit I j M. Jensen, Training Supervisor, Unit I G. Sturgeon, Training Instructor, Unit I D. Meekhoff, Training Instructor, Unit I , Summary of NRC Comments made at exit interview: The preliminary results of the oral exams as noted in paragraph 3 were Jiscusse The plant staff and training staff were cooperative during the ex-amination perio * . 1-
1 . i i Attachments: ' 1. Written Examination and Answer Key (SR0/R0) ! 2. . Written Examination and Answer Key (RO) 3. Facility Comments on Written Examinations made after Exam Review 4. NRC resolutions to facility comments on Written Examinations !
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U. S. NUCLEAR REGULATORY COMMISSION SENIOR REACTOR OPERATOR LICENSE EXAMINATION FACILITY: MILLSTONE 1
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REACTOR TYPE: BHR-GE3 _____----______---------- DATE ADMINISTERED: 85/08/13
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EXAMTNER: CRESCENZOr APPLICANT: e_ _ _ __ ___ INSTRUCTIONS TO APPLICANT: _-----------____---------- .- Use separate paper for the answers. Write answers on one side onl Staple question sheet on top of the answer sheet Points for each question'are indicated in parentheses after the question. The passing grade requires at least 70% in each category and a final grade of at least 80%. Examination papers will be picked up six (6) hours after the examination start % OF CATEGORY % OF APPLICANT'S CATEGORY
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VALUE TOTAL SCORE VALUE CATEGORY
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25 0 25 0 ___1_0___ ___1_0 _ ___________ ________ THEORY OF NUCLEAR POWER PLANT OPERATION, FLUIDS, AND THERMODYNAMICS 25.00 25.00 ________ ______ ___________ ________ PLANT SYSTEMS DESIGN, CONTROL, AND INSTRUMENTATION 25.00 25.00 PROCEDURES - NORMAL, ABNORMAL,
-______- ---___ -__________ -------- EMERGENCY AND RADIOLOGICAL CONTROL 25.00 25.00 ADMINISTRATIVE PROCEDURES, -_-____- __---- _---_------ -------- CONDITIONS, AND LIMITATIONS 100.00 100.00 TOTALS --_---_- _----- ----------- --------
FINAL GRADE _________________% All work done on this examination is my own. I have neither
;siven nor received ai dPPL5EdUTI5~5IGUdTURE~~~~~~~~~~~~~~
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. THEORY OF NUCLEAR POWER PLANT OPERATION, FLUIDS, AND PAGE 2 --_- - -------------------------------------- -_______-_____
QUESTION 5.01 (1.00) During a rapid power increase, very short periods can be maintained, yet for rapid power decreases, the period quickly becomes -80 se Explai (1.00) QUESTION- 5.02 (3.00) Whsn the reactor is at full power and a feedwater controller mal-functinn results in the closure of both feedwater regulating valves, a reactor scram is expected to occur within approximately 8 second During that time. period, is the reactor power level expected to INCREASE, DECREASE, or REMAIN CONSTANT? Give two (2) reasons for your answe (3.00) QUESTION 5.03 (3.00) , , . , , Rosarding the xenon transient following a significant DECREASE in
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rosetor power from high power operation: . a. HOW will peripheral control rod worth be affected (INCREASE, DECREASE, REMAIN THE SAME) during the xenon peak? BRIEFLY EXPLAIN your answe (1.50) b. If the decrease in reactor power was from 100% to 50%, would the new (50% power) equilibrium xenon reactivity be HORE THAN, LESS THAN or EQUAL TO one half the 100% equilibrium value? Briefly, JUSTIFY your answe (1.50)
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. . . THEORY OF NUCLEAR POWER PLANT OPERATION, FLUIDS, AND PAGE 3 ---- -------------------------------------- --------------
'0UESTION 5.04 (2.50) With' regard to the MAPLHGR thermal limitt a. Briefly, WHAT is the reason, or bases for having a MAPLHGR thermal limit? (1.00) WHICH TWO of the following four parameters affect the MAPLHGR LIMIT? (0.50) Moderator Temperature Type of fuel Fuel exposure Reactor pressure If an P-1 is selected on the Process Computer, the pro 3 ram provides, among other things, MAPRAT. WHAT is the relation-ship between MAPRAT and MAPLHGR? (1.00) QUESTION 5.05 (3.00) * The figure below represents six fuel assemblies within a critical reacto Why would an operator expect a higher than normal rod worth associated with control rod B- (3.00) X= control rod fully inserted 0= control rod fully withdrawn X 0 X X 0 X 0 X (***** CATEGORY 05 CONTINUED ON NEXT PAGE *****) _-
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QUESTION 5.06 (2.00) Indicated reactor water level at 100% power differs from the actual water level above the core (that which is present in the steam separators or within the dryer skirt).
. Which level (actual or indicated) is higher and by how many inches? (1.00) Explain why the $bove difference occur (1.00) -
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QUESTION 5.07 (2.00) The plant is operating at 90% power. Extraction steam to the HP feed water heaters is shut off. A visitor, observing that turbine load has increased by 20 MWE after extraction steam wis' shut off, concludes that this action has improved the plant's thermodynamic efficienc Do you agree or disagree? Explain usins relevant plant indications to support your positio (2.00) GUESTION 5.08 (3.00) For the centifusal pump characteristic curve attached to this exam, show how the system operating curve will change and explain why the change occurs if a valve in the discharge of the pump is throttled one-half closed such as might be the case in the feedwater control system. Be sure to label all points and line (1.50) b. The recirculation system uses changes in pump speed to control flow rate. Using the same figure, explain which flow control system is more efficien (1.50) NOTE: You may detach the figure for use in your answe (***** CATEGORY 05 CONTINUED ON NEXT PAGE *****)
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' . . THEORY OF NUCLEAR POWER PLANT OPERATION, FLUIDS, AND PAGE 5 ---- -------------------------------------- ---------_---_
QUESTION 5.09 (2.50) During a reactor startup, the neutron count rate measured on the SRM's has increased to 500 eps at which point the Reactor Engineer states that Keff is 0.99. The reactor operator withdraws eight control rods an additional two notches each. The count rate increases to 4000 ep Is the reactor critical? Justify your answer with at least two arguments or method (2.50)
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W 4-GUESTION 5.10 (3.00) a. A relief valve is stuck open resulting in a flow of steam to the suppression pool. The suppression chamber initially contains 120,000 ft**3 of water at 70 degrees F. How much heat must be added by the relief valve to raise the suppression pool water tem to 100 degrees F if the specific heat of water is 1 BTU /lbm-F? (1.50) b. What would be the temperature of the piping downstream of the relief valve if reactor pressure were 1000 psis and the suppression chamber at 1 psis.? (1.50)
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______________________________________________________ GUESTION 6.01 (2.00) I0 mediately following a reactor scram all the green full-in lights on panel 905 will be illuminated but there will be no rod position readout displayed. Assuming NO operator action is taken to reset the scram signal, it will take a period of time before the '00" position readout is obtained. BRIEFLY EXPLAIN the reason for this observed response; address BOTH the source (s) of the observed indications (green light,*00') and the reason for the delayed '00' readou (2.00)
QUESTION 6.02 (3.00) Answer the followins for tha F.W.C.I. system a. For a F.W.C.I. auto initiation during a L.O.C.%. the flow in the F.W. header for the operating pump combination reaches 105% of maximum normal flow. What affect will this have on the F.W. regulating valves initially, and as pressure decreases? (1.00) b. In the above condition, with the flo.w.at 105%, why would you not want to press the F.W. flow control reset button on panel 905? (1.00) c. During a F.W.C.I. system initiation, the block valves associated with the F.W. string selected were in the closed position. Will the system inject? (yes or no and why) (1.00) QUESTION: 6.03 (3.00) Concerning the recirculation pump seal assembly, describe what indications / alarms would be seen in the control given the following system failures.
' a. Failure of no. 1 seal onl (1.00) b. Failure of no. 2 seal onl (1.00) c. Failure of both seal (1.00)
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. PLANT SYSTEMS DESIGN, CONTROL, AND INSTRUMENTATION PAGE 7 ------------------------------------------------------
GUESTION 6.04 (2.00) Concernins startup of a recirculation pump c. When do the 'A' contacts within the voltase regulatins circuitry shift from the 120 VAC system to the self excitation mode? (0.50) 6. When does the field breaker close and why is there a delay in closing? (0.50) c. What conditions will cause the senerator lockout relay to trip on incomplete start sequence and what breaker (s) will trip? (1.00)
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QUESTION 6.05 (1.50) Temperature indication for the CRD mechanisms is monitored by thermocouP l es in the RPIS probe c. Where does this temperature indication readout and at what temperature will an alarm be received? (0.50) b. Why is it necessary to monitor this temperature? (2 reasons) (1.00) QUESTION 6.06 (2.50) Assume a valid Group 4 isolation exists to answer the followins: e. What signals will cause a group 4 isolation? (0.50) b. Could valve IC-3 be opened? could it be throttled open? Include in your answer why it could or could not be throttle (1.00) c. How can the operator reset the isolation ? (assuming a valid signal no longer exists) (1.00) QUESTION 6.07 (1.00) Why is it necessary to maintain the ESH system pressurized via SW whsn ESW is not in use? (1.00)
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______________________________________________________ QLIESTION 6 08 (3.00) Dascribe the response of the vital AC system subsequent to the followin3 malfunctions. Include in your answer whether vital equipment coy be lost and why. (Do not list equipment lost) a. Loss of 480 volt bus E- (1.00) b. Loss of 480 volt bus E-5 for an extended period of time,( > 8 hrs), with no operator actio (1.00) c. Subsequent to malfunction "b" above, 480 volt bus E-5 is re-energized... (1.00) GUESTION 6.09 (2.00) Concerning a scram on low air pressure in the scram pilot valve air heade a.~What is the purpose of this scram? (1.00) b. When is this scram bypassed? (1.00)
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QUESTION 6.10 (1.00)
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A standby power supply for the gas turbine auxilliaries is from MCC F-4 however, this source should not normally be used. Why is this? (1.00) GUESTION 6.11 (2.00) Choose the correct statement (s) concerning the APR system. If any part of the statement is incorrect, consider the entire statement incorrec (2.00) a. Assuming APR has initiated, the valves may be closed by opening ekt. bkr. DC 11A-2 421 (125 VDC power supply to APR logic and solenoids).
b. There are 4 APR trip logic channels. Channels A-1 and A-2 work as a pair and function identically in a two out of two once logi c. Assuming APR has initiated, the valves will not auto close when reactor reactor water level increases to above - 48 inche d. For each SRV remote manual switch (RMS) there is a green and red lam The red lamp will only illuminate when the RMS is in the OPEN position or if an auto blowdown signal is recieve (xxxxx CATEGORY 06 CONTINUED ON NEXT PAGE xxxxx) _,
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QUESTION 6.12 (2.00) According to OP 336, Core Spray System, the ' Core Spray Header A (B) Hi Dif Pressure' alarm windows are normally in an alarmed state at
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gold shutdown or as cold conditions are approached as the reactor is beins shutdow a.' Durins normal reactor power operations, what is indicated if one of these windows alarms? (1.00) i b. Why are the windows normally showins alarmed status when the reactor is cold? (1.00) _
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. . PROCEDURES - NORMAL, ABNORMAL, EMERGENCY AND PAGE 10 ~~~~ ~
RA65ULUU5UAL CUNTRUL'~~~~~'~~~~~~~~~~~~~~~~~ ____________________ GUESTION 7.01 (3.00) a. Using the attached copies of figures 2 and 8 from procedure E0P-580, Containment Control, determine the minimum suppression pool water level allowable given the following plant condition . RPV pressure = 500 psig 2. Suppresion pool temperature = 170 deg. NOTE: show all calculations (2.00) b. If suppression pool water level cannot be maintained above the curve on figure 2, the procedure directs the operator to commence emergency RPV depressurization. What is the basis for this procedural step? (1.00) DUESTION 7.02 (2.00)
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Operators are cautioned against bypassing of feedwater heaters other than the HP heaters. Why is this? (2.00)
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QUESTION 7.03 (3.00) Regarding the CRD System Operating Procedure (OP-302): a. During operation at RATED power, the rod position indicator gives evidence of rod drive DRIFT OUT followins a withdraw si3na WHAT THREE (3) immediate operator actions are required? (1.50) . WHEN must the CRD hydraulic system be in operation? (0.75) 2. WHEN should the CRD hydraulic pumps NOT take a suction from the Hotwell Reject Line? (0.75) GUESTION 7.04 (3.00) Concerning Procedure OP-201 (Approach to Criticality) WHAT checkoffs must be performed prior to Unit Startup? (1.0) b. WHO'S permission is required to take the reactor critical? (1.0)
(3 REGUIRED)
c. WHAT information is recorded in the Shift Supervisors Log WHEN criticality is achieved? (7 REQUIRED) (1.0)
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. PROCEDURES - NORMAL, ABNORMAL, EMERGENCY AND PAGE 11 -~~--------------------- ~~~~Rd6 ULUU5EdL'UEUTR5t
____________________ GUESTION 7.05 (1.50) With the Reactor operating above 5 % thermal power during a plant heat-up OP-202 (Plant Heatup) cautions the operator to remove the Mechanical Vacuum Punp from service once condenser vacuum reaches 23' Hg . a. Explain the reason for this step including any adverse consequences resulting from leaving the pump in service . (1.50) GUESTION 7.06 (3.00) OP-206, Plant Cooldown to Cold Shutdown, cautions that when both rocctor recirculation pumps are off, reactor vessel level must be ocintained above + 50 inches, a. What is the reason for this Precaution? *
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b. What additional precautions must be taken if level cannot be' maintained above +50 inches? (2.00) QUESTION 7.07 (1.75) Procedure OP-207, Scram Recovery, requires a check to be performed followin3 a scram to ensure a Limiting Safety System Setting was not exceeded. How can this be checked? (1.75) GUESTION 7.08 (1.50) a. State the temperature range within which the RBCCW heat exchanger outlet temperature should be maintaine (0.50) b. When is it perr.issible to use the RBCCW heat exchanger Service Water outlet butterfly valves 1-SW-6Ar 68, 6C, to regulate RBCCW heat exchanger outlet temperature? (1.00)
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l- PROCEDURES - NORMAL, ABNORMAL, EMERGENCY AND PAGE 12 l --- RA5i5E55iEAE ____________________ E5siE5E------------------------ -f f GUESTION 7.09 (2.00)
OP-329, Standby Gas Treatment, section 7.4.3, (establishing a cooling air flow path to remove decay heat from SGTS filter train), cautions that the non-operating SGTS train must be manually placed into service i ' PRIOR TO opening the cooling air damper 1-SG-7A(1-SG-78). What is the-reason for this caution? (2.00) GUESTION 7.10 (1.50)
Using the attached copy of Unit l's Emergency Action Levels, classify the following events. Consider each event independently.
- a. LOCA inside drywell with rapid depressurization.. Core Spray pump 'A'
fails to star (0.25) l b. Threat of multiple bombs on site, one bomb has been located in turbine building, currently bein3 disarme (0.25) c. Thunderstorm on site wind speed burst of 82 MP (0.25) d. Malfunction in radwaste facility resulting in release rate which corresponds to 2 REM .B. at max. offsite locatio (0.25) j e. ARM on refueling floor indicates 1200 mr/hr, fuel handling in progres J t . (0.25) f. Injured man on refuel floo .!DA/ H I "O" t W" (0.25) , GUESTION 7.11 (1.25) l List the immediate actions upon a loss of all station A.C. powe (1.25) ! QUESTION 7.12 (1.50) Regarding procedure ONP 511, Plant Shutdown From Outside The Control , Room.
i- a. Following an evacuation of the control room, where should the ' SS'and SCO report to? (0.50) b. If the reactor was not scrammed prior to evacuation, how should
- the operator scram the reactor from outside the control room?
! (Assume Main Condenser and feedwater are available) (0.50) c. How is a scram from outside the control room verified? (0.50) ! lruxxx END OF CATEGORY 07 *****) i ! !
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80 ADMINISTRATIVE PROCEDURES, CONDITIONS, AND LIMITATIONS PAGE 13 __________________________________________________________ QUESTION 8.01 (2.25) With the plant in cold shutdown, during your shift, the Chief Maintenance Engineer requests that a Vital Area be re-classified to a Non-Vital status to expedite personnel access performing maintenance activit a. What operational criteria must be met prior to your approval ? (1.00) b. When must the area be re-classified back to a Vital Status once maint-enance work is completed and what must be done prior to this re-class-ification ? (1.25) DUESTION 8.02 (3.00) Concerning ACP-GA-9.02 (Station Surveillance Program); During your shift an LCO. occurs that requires pump and valve operabil-ity surveillance requirements be met for the FWCI sys. Can these sub-systems be assumed to be operable ? If not, why. If so, under what con-dition (1.00) bo What is the specified allowable time interval for the followins test-frequency . Daily Surveillance Tests (0.33) 2. Monthly Surveillance Tests (0.33) 3. Guarterly Surveillance Tests (0.34) c. What is the maximum allowable extension period for surveillance test intervals ? (1.00) GUESTION 8.03 (3.00) With the mode selector switch in 'RUN', the MSIV's 90 shut at 825 psi a. WHAT does this isolation Provide protection against? (1.00) bo WHAT undesirable plant operations (i.e., parameters / conditions) does the resulting scram prevent? (2.00) GUESTION 8.04 (1.25) Is en SRO required to be present on the refuel floor for the change out of an LPRM detector? WHY OR WHY NOT? (1.25)
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__________________________________________________________ GUESTION 8.05 (3.00) During refueling operations, on the 4.00pm to 12.00 midnight shift, the I & C Engineer informs you that the (A) S.G.T.S. failed to meet the flow operability requirements (according to procedure) during surveillance testins. Using the attached copy of Technical Specifications can refueling operations continue? If not, WHY. If so under WHAT CONDITIONS? (3.00) 00ESTION 8.06 (2.00) The reactor is operating at 100% reactor power and 100% recirculation flow with the two recirculation pump speeds within 10% of each othe During a routine surveillance, it is found that indicated total core flow is 12% greater than previously established power-core flow relationship Using the attached technical specifications, can the plant continue to operate under these conditions? Reference any sections of the T.S. used in your answe (2.00)
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QUESTION 8.07 (2.50) List the shift manning requirements (per tech specs) for the following situation Shutdown Condition with core alterations in progres (1.25) Shutdown with average coolant temperature greater than 212 (1.25) DUESTION 8.08 (1.25) TRUE OR FALSE: It is allowable to lift tags from equipment and temporarily operate that equipment without clearing the tags from the tas lo (0.25) b. Blue tags are placed on electrical equipment onl (0.25) c. Only operations department personnel are allowed to place or clear safety tag (0.25) d. The on-shift SS/SCO are the only persons authorized to issue safety tas (0.25) e. More than one job order may be used for a tasout, provided the SS/SCO is aware of its us (0.25)
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QUESTION 8.09 (2.00) Using the attached Tech. Specs, and given the following Plant conditions, determine the allowable time that the reactor may continue operating: a. It is discovered that the 'B' LPCI heat exchanger inlet valve is shut and cannot be opene (1.00) b. Within the next few minutes, it is discovered, (in addition to the conditions of part a above), that the 'A' LPCI pump is
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inoperabl (1.00) DUESTION 8.10 (1.00) According to Tech Spees-section 6.9, which of the following events requires prompt notification of the NRC with a written followup report. (More than one answer may be required) (1.00) Abnormal degradation discovered in the reactor coolant pressure '9-
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boundar b. A calculated reactivity balance indicating a shutdown margin less conservative khan specified in the teghnical spec c. Conditions leading to operation in a degraded mode permitted by a limiting condition for operatio d. Plant shutdown required by a limiting condition for operatio QUESTION 8.11 (3.00) The reactor is operating at high powe A TURBINE TRIP occurs causing a scram on HIGH FLUX: HAS a violation of the Technical Specifications occured? WHY OR WHY NOT? (1.50) b. WHAT action (s) are you as the Shift Supervisor required to take? (1.50) QUESTION 8.12 ( .75) An ' Alert" status has been declared during a refueling outage. Are the EPIP functions of the STA required? If sor who will perform these functions? (0.75)
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ANSWERS -- MILLSTONE 1 -85/08/13-CRESCENZO, ANSWER 5.01 (1.00) The period during power increases is governed by how quickly the nsutron population can increase. The sara holds true on a power decrease however, the neutron population is dominated by the longest lived dolayed neutron precursor. This decays with -80 sec. perio (1.00) REFERENCE Millstone Reactor Theory pg. 3-45 FJC 67 ANSWER 5.02 (3.00) DECREASE.EO.53 REASONS: Immediately the loss of feedwater flow causes a decrease in moderator subcooling which introduces negative dk/k into the core.[1.03 When feedwater flow drops below 20% (~3 see into trans.)
the recirc pumps auto runback to 28%. The decrease in core flow causes an increase in voiding which also adds neg. dk/k into core.[1.53
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REFERENCE Millstone Rx Theory & Recire Flow Cont. FJC 77
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. . . THEORY OF NUCLEAR POWER PLANT OPERATION, FLUIDS, AND PAGE 17 ---- -------------------------------------- -----___----__
ANSWERS -- MILLSTONE 1 -85/08/13-CRESCENZO, ANSWER 5.03 (3.00) Peripheral rod worth will increase E0.33 because the highest ' xenon concentration will be in the center of the core CO.33 where the highest flux existed previously E0.3 This will suppress the flux in the center of the core E0.33 and increase the flux in the area of the peripheral rods, thereby, increasing their worth E0.3 More than one half the value at 100% power E0.5 The Xenon production rate is directly proportional to power
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. ,3 level, but removal rate is proportional to Xenon concentration and it contains a power dependant term, thermal neutron flux.CO.503 Since flux is directly proportional to power level the burnout term becomes less significant. This results in an equilibrium Xenon value which is lower than the original equilibrium value but greater than one half the original concentration.EO.503 REFERENCE -
Millstone Rx Theory pps. 6-7, **~ 6-1 FJC 78 ANSWER 5.04 (2.50) Minimize fuel damage during a D8A LOCA by limiting the peak clad temperature (to < 2200 F) -OR- limiting bundle stored energ (1.0) and (0.5) MAPRAT = MAPLHGR/LIMLHGR -or- = MAPLHGR/MAPLHGR limit (1.0)
-or- = (MAPLHGR) actual / (MAPLHGR) LCO max REFERENCE Millstone Therm pg. 8-25 to 8-28 FJC 79
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_____ _ _ __ ______________________________________ ______________ ANSWERS -- HILLSTONE 1 -85/08/13-CRESCENZO, F.
ANSWER 5.05 (3.00) With control rods A-1, B-1, B-3, and C-2 withdrawn, and B-2 still fully inserted, the ' effective" core consists of four small four-bundle reactors. Each is essentially uncoupled because neutrons from one can't pass through the inserted control rod. By withdrawing the control rod, 16 bundles are immediptely coupled into one 20 bundle reacto Thus the size of the control rod is effectively much larger than its actual physical size would suggest, and its rod worth is larg (3.00) REFERENCE Millstone Rx Theory pg. 5-17 FJC 80 ANSWER 5.06 (2.00) e. Indicated is highe (0.5) 7-10 inches higher -
(0.5)
b. Indicated level is sensed outside the dryer skir (0.5) Steam flow through the steam separator / dryer at 100% causes a backpressure of 7-10 inches H2 (0.5) REFERENCE Millstone Vessel Instrumention LP pg. 15 FJC 81 ANSWER 5.07- (2.00) Disagre (0.5) Thormodynamic efficiency compares energy in to versus energy out. The increase in generator output resulted from decreasing the amount of entraction steam diverted to the HP FW heaters (0.5) This condition requires additional energy output from the reactor to raise feedwater temperature to the same saturation temp as before. (0.5) This is evidenced by a decrease in feedwater temperature and an increase in reactor power or HW (0.5) REFERENCE Hillstone Thermodynamics chap. 4 FJC 82
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is THEORY OF NUCLEAR POWER PLANT OPERATION, FLUIDS, AND PAGE 19
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ANSWERS .l- MILLSTCHE"i: -85/08/13-CRESCENZ0, ANSWER 5.08 (3.00) Throttling the valve causes more friction losses in the system and the system curve moves to the lef (1.00) b. Chansins pump speed is more efficient since a lower flow rate can be achieved without increasing the pump head. Increasins pump head, as with throttlins, requires more powe (1.00)
(correct drawins required) . (1.00)
may also S n u s j s fe m eE@[u-ecf , Oermo, " "ck o fe m **dal eTTJ<,.. ..
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REFERENC Millstene:' Thermodynamics chap. 12 FJC 84
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Head g Lt b am of'U"4 P*
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. Figure Pump Charact. eristic. Curve
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. . . - THEORY OF NUCLEAR POWER PLANT OPERATION, FLUIDS, AND PAGE 20
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- ANSWERS -- MILLSTONE 1 -85/08/13-CRESCENZO, F.
' ANSWER 5.09 (2.50)
:
N (0.50) If the count rate has leveled off, that is, it is not continuins to , t increase at a steady rate without additional control rod motion, the
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reactor is not critica (1.00) )
2. From the equation CR1/CR2 = (1-K2)/(1-K1), it can be shown that K2=0.99875. OR using the gpunt rate doubling technique, -- the same result can be show (1.00) .
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ressure, ut the EHC sedhes this and o ens the TCV'; to maintain p essure d\ increase turbine output./A point 4 the rise in ppwer in t e r actor i terminated by' negative reg'eti ity inserti ns from t1e void an fuel emp) coefficients At oin 5,thereactorpow\
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not e tivity \assip/at .=er e stabili: Q a new (O.alue,for wi h e e e no. 2-4) . REFERENCE , ,' Millstone Reactor Theory, pps. 3-5 thru 3-15 FJC 85 i ANSWER 5.10 (3.00) a. Q= (120,000 ft**3)(62.3 lbm/ft**3)(100-70)(1 BTU /lbm-F) Q=224,280,000 BTU (1.50) i b. 300 F +,- 10 F (Isenthalpic expansion across SRV answer from Hollier~ diagram) (1.50) REFERENCE , Millstone Thermo pg. 1-50 and chap 2 . FJC 86 f
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h PLANT SYSTEMS DESIGN, CONTROL, AND INSYRUMENTATION * PAGE 21 ___________________________________..__________________ ANSWERS -- MILLSTONE 1 -85/08/13-CRESCENZO, ANSWER 6.01 (2.00) Bafore the SDV is full the rods will be held in an overtravel position due to a large d/p across the drive piston, and the overtravel reed switch will illumimate the green full-in light C1.03. When the SDV is full there will no longer be a d/p, , across the piston and the rod will settle and close the '00' position reed switch.[1.03
' REFERENCE Millstone L.P. CRD HYD. SYS, Rev 1, pg. 29 FJC 87
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ANSWER 6.02 (3.00) The F.W. res valves will shift from level control to flow control. (0.5)- Flow control will limit flow to 105%. As reactor pressure decreases, the F.W. res valves will modulate closed (0.5) b. Pressing the F.W. flow control reset button with flow at 105% wil reet ailuw reset Lu thc il u w me..Lrvi moor u.d set up ac to cause pump-eunout.' W"c a res e.t b (".( odre t a.s A ondition (1,oo) Yes. The block valves open (ifclosed)(within43 second (1 00) REFERENCE Millstone L.P. # 1334, pg. 4-5,and 0 P. 4334 pg. 8 FJC 89 ANSWER 6.03 (3.00) No. 2 seal pressure would approach no. 1 seei t' essure. Leakage through no. 2 orifice will go to 1.1 spm e3G f i. A will alarm at 0.9 spm (1.00) b. No. 2 seal pressure would drop upon magnitude of the failur Leakage thru FS B would exceed 0.25.spm and alarm hig (1.00) c.' Total leakage out of the seal system would approach 60 spm as
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limited by the breakdown bushing. Both FS A and B would alarm high. Pressure in both seals would drop dependent on the magnitude of the failur (1.00) REFERENCE Millstone L.P. 1301A Rev. 2 Figure 3 FJC 90
* . . PLANT SYSTEMS DESIGNr CONTROL, AND INSTRUMENTATION PAGE 22
______________________________________________________ , ANSWERS -- MILLSTONE 1 -85/08/13-CRESCENZ0, ' ANSWFR 6.04 (2.00) a. 8 seconds after closing of the drive motor breake (0.50) seconds after closing of the drive motor breaker. This is to allow speed to increase to 80% for breakauay torqu (0.50) i c. 32 seconds after closing of the drive motor breaker if < 2.5 psid sensed across the pump. This will trip both the drive motor (0.50) breaker and the field breake (0.50)
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REFERENCE Millstone L.P. 41301B Rev 3 pg. 12 and 16 FJC 91 ANSWER 6.05 (1.50) Indigation reads out in the control room on a multipoint indicator. Alarms at 250 F (0.50) b. Warns of high temperature which can damage internal CRD seals and gives indication of leaky scram outlet valve (1.00) REFERENCE Millstone L.P. 13028 Rev. 1 pg. 18 FJC 92 ANSWER 6.06 (2.50) % steam or condensate flow within the IC system (0.50) Yes, Norwill not throttle if auto initiation or isolation signal exist (1.00) Take the operators for the valves which isolated (IC-1,2,3,4) to close and reset at CRP 90 (1.00) REFERENCE Millstone L.P. 1307 Rev. 2 pg. 6-7 FJC 93
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. PLANT SYSTEMS DESIGNr CONTROL, AND INSTRUMENTATION PAGE 23
______________________________________________________ ANSWERS -- MILLSTONE 1 -85/08/13-CRESCENZO, ANSWER 6.07 (1.00) To prevent an unmonitored radioactive release from the LPCI HX (1.00) REFERENCE Millstone L.P. 1309 Rev. 2 ps. 23 FJC 94 ANSWER 6.08 (3.00) e. Upon loss of bus E-5, the AC motor will be lost and power for the generator will shift to the DC motor. Vital loads should not be lost due to the flywheel assembly which will maintain voltage and freq during the transfe (1.00) b. When the battery which is supplying the DC motor depletes after approx. 8 hrs., the generator will eventually shutdown causing an ABT shift to the alternate AC powered from IV-1(f-5).
Loads may be lost due to the non sync break before make. Also the generator output breaker will open on undervoltag (1.00)
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c. When power is restored, the MG set will re-energize via the DC supply. In 15 minutes it will transfer to the AC supply however the output breaker must be closed manuall (1.00) REFERENCE Millstone L.P. Vital AC pg. 2-3 and 0.P.-343 rev 5, pg. 8 FJC 95 ANSWER 6.09 (2.00) To eliminate the consequence of a slow scram ( random rod insertion ) upon loss of air header pressure to the scram valves . (1.00) Mode switch in shutdown / refuel and the S.D.V. bypass switch in bypas (1.00) REFERENCE Millstone L.P. 1408 Rev. 2, R.P.S., pg. 18 FJC 99
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* . . , PLANT SYSTEMS DESIGN, CONTROL, AND INSTRUMENTATION PAGE 24
______________________________________________________ ANSWERS -- MILLSTONE 1 -85/08/13-CRESCENZO, ANSWER 6.10 (1.00) HCC F-4 is shed during LNP thus the G.T. auxs. would be powered from the battery which would eventually deplete and shutdown the gas turbin (1.00) REFERENCE Mil.lstone L.P. 480 VAC d(st. pg. 10 FJC 100 ANSWER 6.11 (2.00) a. Incorrect (There are two supply breakers) (0.50) b. Incorrect (A-1, A-2 do not function identically) (0.50) c. Correct (0.50) d. Correct (0.50)
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' REFERENCE Millstone L.P. 1337 Rev~'2.pg. 8-11 and 0.P. 344A Rev 7 pg. 3 FJC 101 ANSWER 6.12 (2.00)
c. The alarm indicates a possible loss of integrity of the header between.the shroud and the vessel wal (1.00) 6. The dP sensors are calibrated for hot conditions. Sensed pressure - will decrease with decreasing temperature of the reacto (Normal reading is 4 pside and the alarm point is 2 psid.) (1.00) - REFERENCE OP 336, section 8.3 and 8.4, LP 4 1336, pps. 10-11, and fig. FJC 128
- - - . _ . _ . . . PROCEDURES - NORMAL, ABNORMAL, EMERGENCY AND PAGE 25 - ---------------~~~------ ~~~~R55 UL55iCAL 55ATR5L
____________________ ANSWERS -- MILLSTONE 1 -85/08/13-CRESCENZO, ANSWER 7.01 (3.00) a. From figure 8, maximum suppression pool temperature for RPV pressure of 500 psis is approximately 178 de3rees F. Subtracting 170 from 178 sives a delta temp. of 8 degrees F. From figure 2, minimum suppression pooljwater level corresponding to 8 degrees F is approximately 19, feet. 11 (2.00) b. Delta T (heat capacity) is compared to pool level to determine if sufficient water is available to assure complete steam condensation on a RPV depressurizatio (1.00)
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REFERENCE Millstone E0P 580 Re , Containment Control FJC 40 ANSWER 7.02 (2.00) i 1. An unbalanced axial thrust will develop on the turbine shaft if a HIP or..IP is removed from.. servic ~
- . (1.00)
2. Excessive steam flows in other in-service heaters will cause tube vibration or excessive condensate flow (1.00) REFERENCE Millstone L.P. 1346/1348 Rev 1 ps. 13 FJC 102 ANSWER 7.03 (3.00) a. Actions on abnormal rod motion: 1. Attempt to stop the motion with an insert si3nal, (0.5) if motion continues, scram the ro (0.5) 2. Reduce recire flow to maintain rated power at <2011 MWT (0.5) b. 1. It must be in operation whenever the reactor is critical and whenever the vessel is ho (0.75) " 2. When the possibility of high condensate conductivity exists, includins, but not limited to, unit startup (0.75) REFERENCE Millstone OP-302, rev. 15, ps 3, 5 a 46 FJC 104 l l i i l l
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.; PROCEDURES - NORMAL, ABNORMAL, EMERGENCY AND PAGE 26
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R 5iBL55iEAL E5NTR5L ____________________ ANSWERS -- MILLSTONE 1 -85/08/13-CRESCENZO, ANSWER 7.04
: (3.00) Prerequisite Chechoffs:
1. Pre-critical Sys. Status _ Checkoff OR (OPS Form 201-3) (0.33)
.2. Pre-critical checkoff OR (OPS Form 201-1) (0.33)
3. Panel 905 Pre-critical Checkoff OR (OPS Form 201-2) (0.34) The Station Superintendent or, (0.33) Unit Superintendent (0.33)
. Operations Supervisor (0.34)
c. Record the time, period, rod, group, notch, Rx water temperature and the critical number in the SS Lo (1.00) REFERENCE Millstone OP-201, Rev.13, pg. 2 &,5 and ACP 6.01 Rev. 13, sect. 6. FJC 105 ANSWER 7.05 (1.50) a._ Reactor power operation above 5 % thermal power causes significant am-ounts of Hydrogen and Oxygen in the main condenser. ( O.50 ) Operation of the Mechanical Vacuum Pump under these conditions could result in a detonable concentration of hydrogen and oxygen at atmospheric pressure in the pump or its associated water separator. ( Personnel and Equip-ment hazzard ). ( 1.00 ) REFERENCE
. Millstone OP. # 202, Rev. 13, pg. FJC 108 ANSWER 7.06 (3.00) Maintain level > +50 inches to enhance natural circulation and thus prevent thermal stratification and heatup/ pressurizatio (1.00) (The operator must assume that thermal stratification, heatup, and pressurization may occur). Primary and secondary containment must be maintained and tech specs for above 212 F operation must not be violated. Personnel workin3 on primary components must be advised of'possible pressurization. Monitor vessel parameters for prompt indication of heatup. Run shutdown cooling in max. flow, 2 pumps. (2.00)
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.. , * . * . PROCEDURES - NORMAL, ABNORMAL, EMERGENCY AND PA9E 27 ~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~
R 656L66565L"66UTE6L ____________________ ANSWERS -- MILLSTONE 1 -85/08/13-CRESCENZO, F.
. REFERENCE
~0P-206, Re , pg. FJC 114 ANSWER 7.07 (1.75)
Chsek that the reactor scrammed on its primary source signal by reviewing the printouts of the sequence of events typer, the computer typers, and the
. charts of applicable recorded parameter (1.75)
REFERENCE - OP-207, Re , p . FJC 115 ANSWER 7.08 (1.50) a. 75 F +, , 10 F (0.50) b. If it necessary to cover heat exchanger tubes (when three heat exchangers are needed for plantcooldown) (1.00) REFERENCE ..r OP-309C, Re , pg. FJC 116 ANSWER 7.09 (2.00) This action prevents the steam tunnel isolation dampers from opening while the SBGT system is operating. Opening of the steam tunnel isolation dcapers during SBGT operation would allow a path for a potential uncontrolled radioactive releas (2.00) REFERENCE OP-329,-Rev. 11, pg. FJC 117 _- . . _ _ = - - - . . . - . . _ . _ . _ _ _ _ _ _ . _ _ _ _ _ _ _ ._ _ _ .,. _ *
. * . * . , PROCEDURES - NORMAL, ABNORMAL, EMERGENCY AND PAGE 28 , - ------------------------ ~~~~R A5 5t55i5AL 55nTR5L
____________________ ANSWERS -- MILLSTONE 1 -85/08/13-CRESCENZO, . ANSWER 7.10 (1.50) a. General Emergency (0.25) Alert (0.25) c.-None required however candidate may elect to classify as an unusual even (0.25) General Emergency (0.25) e. Site Area ' Emergency ov- aked 3 m. f.L oc$de6h ac'I s h k='k (0.25) f. None require (0.25) REFERENCE Millstone EAL's Re FJC 130 ANSWER 7.11 (1.25) 1. Verify Reactor Scra (0.25) 2. Close all MSIV's from CRP 903 and place the Isolation Condenser in servic (0.50) 3. After automatic start of diesel generator and/or G.T.G., start one RBCCW pump and one CRD pum (0.50) REFERENCE , Millstone ONP 503B Rev. 1 p . FJC 131
. ANSWER 7.12 (1.50) SS- shutdown communications area by make demineralize (0.25)
SCO- Main steam line 8254 pressure switche (0.25) By isolating and venting scram air header low pressure pressure switches on rack 2251 (0.50) Check all scram valves ope (0.50) REFERENCE Millstone ONP 511 Re . pps. 1-3 FJC 133
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'. ADMINISTRATIVE PROCEDURES, CONDITIONS, AND LIMITATIONS PAGE 29
__________________________________________________________ ANSWERS -- MILLSTONE 1 -85/08/13-CRESCENZO, ANSWER 8.01 (2.25) a. All equipment is out of service ( for maintenance ) and not required by Technical Specifications for the existing mode of operation. ( 1.00 ) b. Prior to proceeding to the operating moderaccording to Tech. Spec.s, re-quirin3 operability of the Vital equipment.(0.50) A plant operator and a security rep, must inspect the area for explosives and/or abnormal conditions.( 0.50 ) Update the Shift Supv. and Security Loss as to the time /date and results of the inspection. ( 0.25 ) REFERENCE Adain. Procedure ACP. 7.05 Access Contro FJC 109 ANSWER 8.02 (3.00) Yes . A system or component can be assumed operable if the associated surveillance requirement.s have been satisfactorily' performed within the specified time interval, the system is not having maintenance being performed and is in an operable statu (1.00) b. 1. Any hour of the day plus or minus six hours, not less than once/ da . The scheduled date plus or minus one week, not less than 12/ yea . The scheduled date plus or minus three wks., not less than 4/ yea (0.33 for each correct answer) An extension not to exceed 25 % of the test interval and a total maximum combined interval time for any three ( 3 ) consecutive tests not to ex-ceed 3.25 times the test interva (1.00) REFERENCE Millstone ACP.-GA-9.02-Station Surveillance Program . FJC 111
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l I l ADMINISTRATIVE PROCEDURES, CONDITIONS, AND-LIMITATIONS PAGE 30 __________________________________________________________ ANSWERS -- MILLSTONE 1 -85/08/13-CRESCENZO, * ANSWER 8.03 (3.00) a. This was provided to give protection against fast reactor l depressurization and,the re u ting rapid cooldowo of the al<e> c conh k vdve.)
' vessel.E1.03 re o p n.%3 as pressn r4 AboeSE p oron r <. h p% u io n fre.w Bypus
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i b. It prevents high p wer operation at low reactor pressure from occurins,[1.03 thus providing Protection for the fuel cladding safety limit.[1.03 REFEdENCE Millstone T/S Bases 2.1.2.G & H FJC 118 l . ANSWER 8.04 (1.25) The SRO is required to be present as this is,, classified as an ALTERATION of the Rx Cor (1.25)
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REFERENCE . Millstone T/S Def. ALT of Rx Core
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FJC 119
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ANSWER 8.05 (3.00) The LCO. for the S.G.T.S in this condition as stated in Tech. Spec. se .7.b.3 and 3.7.b.4. allows for refuelins operations to continue for a period of seven (7) days provided that durins such'seven days,all active ! co:ponents of the other S.G.T.S. train (and associated circuitry), be oporabl (1.50) In addition there shall be operable either, , a. two sources of outside power (two 345kv or one 27.6kv and one 345kv) l and one emergency power source , OR b. one source of outside power and two (2) emergency power sources, for operation of the components'in the operable S.G.T.S. train.(1.50) PSFERENCE icchnical Specifications Sec. 3.7.B.3 and 3.7. FJC 120 ,
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8.' ADMINISTRATIVE PROCEDURES, CONDITIONSr AND LIMITATIONS PAGE 31
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ANSWERS -- MILLSTONE 1 -85/08/13-CRESCENZOr ANSWER 8.06 (2.00) Yos. As per T.S. 4.6.G.1, operation may continue since it can be ecsumed that indicated recirculation pump flow-to-speed mismatch is less than 10%, both indications of .6.G.1.a and b must bo seen to declare a jet pump inoperabl If candidate ASSUMES indication of recire pump flow 2t3-speed mismatch then plant must be in cold shutdown in 24 hrs. per ' 3.6. (2.00) REFERENCE Millstone T.S. 3.6.G. and 4. FJC 121 ANSWER 8.07 (2.50) c. 2 SOL's one dedicated to supervision of core alterations 1 OL ., 1 Non-licensed operator (1.25) b. 2 SOL's ., 2' OL 2 NLO 1 STA (1.25) REFERENCE Millstone T.S. table 6. FJC 122 ANSWER 8.08 (1.25) e. True (0.25) True (0.25) c..True (0.25) True (0.25) o. False (0.25) REFERENCE Millstone ACP 2.06A, Rev. O FJC 123
* . . . ., ADMINISTRATIVE PROCEDURES, CONDITIONS, AND LIMITATIONS PAGE 32
__________________________________________________________ ANSWERS -- MILLSTONE 1 -85/08/13-CRESCENZOr ANSWER 8.09 (2.00) a. Shutdown in 4 days per T.S. 3.5. (1.00) b.' Shutdown in 24 hrs. per T.S. 3.5. (1.00) REFERENCE Millstone T.S. 3.5.B.5,6 FJC 124
' . ANSWER 8.10 (1.00) *'
arb (1.00) REFERENCE Millstone T.S. section FJC 125 ANSWE .11 (3.00) a. YES, a T/S violation has occurred.[0.53 A Safety Limit is assumed to have_been exceeded if the scram is accomplished by a means other than the primary source signal.[1.03 b. Ensure the reactor is in at least hot shutdown within two hoursCO.53 notify the NRC Operations Center within one hourto.53 and start preparation of a Safety Limit Violation Report.CO.53 REFERENCE Millstone T.S. 2.1.1.C AND FJC 127 ANSWER 8.12 ( .75) Yes. A designated management representative will perform the functions of the ST (0.75) REFERENCE , Millstone EPIP Form 4102 Rev. 1 FJC 132 !
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TEST CROSS REFERENCE PAGE 1 QUESTION VALUE REFERENCE ________ ______ __________ 05.01 1.00 FJC0000067 05.02 3.00 FJC0000077 05.03 3.00 FJC0000078 05.04 2.50 FJC0000079 05.05 3.00 FJC0000080 05.06 2.00 FJC0000081 05.07 2.00 FJC0000082 05.08 3.00 FJC0000084 05.09 2.50 FJC0000005 05.10 3.00 FJC0000086 ______ 25.00 ,
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i 06.01 2.00 FJC0000087 06.02 3.00 FJC0000089 06.03 3.00 FJC0000090 06.04 2.00 FJC0000091 06.05 1.50 FJC0000092 06.06 2.50 FJC0000093 '- 06.07 1.00 FJC0000094 _ , . 06.08 3.00 FJC0000095 06.09 2.00 FJC0000099 . 06.10 1.00 FJC0000100 06.11 2.00 FJC0000101 06.12 2.00 FJC0000128 ______ 25.00 07.01 3.00 FJC0000040 07.02 2.00 FJC0000102 07.03 3.00 FJC0000104 07.04 3.00 FJC0000105 07.05 1.50 FJC0000100 07.06 3.00 FJC0000114 07.07 1.75 FJC0000115 07.08 1.50 FJC0000116 07.09 2.00 FJC0000117 07.10 1.50 FJC0000130 07.11 1.25 FJC0000131 07.12 1.50 FJC0000133 l ______ 25.00 08.01 2.25 FJC0000109 08.02 3.00 FJC0000111 08.03 3.00 FJC0000110 08.04 1.25 FJC0000119 08.05 3.00 FJC0000120 08.06 2.00 FJC0000121 08.07 2.50 FJC0000122 i , t
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TEST CROSS REFERENCE PAGE 2 GUESTION VALUE REFERENCE ________ ______ __________ 08.08 1.25 FJC0000123 08.09 2.00 FJC0000124 08.10 1.00 FJC0000125 08.11 3.00 FJC0000127 08.12 .75 FJC0000132 ______ 25.00 ______ ______ 100.00-e
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U.S. NUCLEAR REGULATORY COMISSION y REACTOR OPERA 10R LICENSE EXAMINATION Facility: a111 stone 1 Reactor Type: Boiling Water Reactor
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Date Administered: August 13 1985 Examiner: Brian K. Hajek Candidate: M A STErd - T lu A L
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INSTRUCTIONS TO CANDIDATE: Use separate paper for the answers. Write answers on one side onl Stapir question sheet on top of the answer sheets. Points for each question are indicated in parentheses after the question. The passing grade requires at least 70% in each category and a final grade of at least 80%. Examination papers will be picked up six (6) hours after the examination start % of ' Category % of Candid'te's a Category Value Total Score Value Category
. 25 25 Principles of Nuclear Power Plant Operation, Thermo- .- dynamics, Heat Transfer and Fluid Flow 25 25 Plant Design Including Safety and Eme'rgency Systems 25 25 Instruments and Controls 25 25 - Procedures - Normal, Abnormal, Emergency, and Radiological Control 100 TOTALS Final Grade %
All work done on this examination is my ow I have neither given nor received ai Candidate's Signature
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August, 1985 Millotona Unit 1
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1 PHINCIPLES OF NUCLEAR FOWER PLANI UPEHAILON, lHERMODYNAMICS, ,
' '
HEAL TRANSFEH, AND FLUlu FLOW (25)
, OP 201, Startup to Criticality, states "When neutron count rate has doubled four (4) times, the
{ reactor operator shall withdraw each rod in a group
, one notch and repeat this sequence until the group is at its designated position." Until this point in the procedure, it was r permissable to use notch override to w1thdraw j control rod When may notch override be usec ;
again with rod withdrawa1Y (U.b) - Explain the reason for requiring the single notch withdrawal method to be use Include j
. (1) the specific conditions that can cause l
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d1+ faculties 14 caution as not exercised,
, (2) how core position can affect the severity- i '
of the problem, and (d) what might occur 1+ this caution as not observe (2.0) Core ori+1cang is used to assure unif orm flow through all fuel element Briefly explain how t core oriftcing assures relatively unif orm flow independent of plant operating conditions,ang 4a. @ d M i 4 location in the cor (2.0) O N ,JD
'# ^ Power level is being maintained on the 1HMs to i maintain a heatup rate of about 70 F/hr in !
accordance with DP 202, Plant Heatup. Step I requires the reactor head vents to be closed prior r to reaching 200 F. As the reactor operator, you close the head vents at CHP 904, and note that the panel, indications switch to indicate proper closur However, a fault occurred at the valves, and the hgad vggts have Ogt cigsed. but you, , believing the valves have closed, continue the heatup procedur Considering (1) reactor power and reactivity,
' , (2) water temperature,
! (3) vessel pressure, and I (4) the resultant effect on the heatup rate, j briefly explain how the reactor system would respond to thi s malf unction, and what indications you would have that this fault had occurre (3.0) l
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l HD Examination Page 1 of 12
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- . -- -_ .- _ - _ _ - - - . - - - . . . . , * , August, 1986 M111etona Unit 1 . The Standby Liquid Control System provides an alternative to control rods for shutting down the reactor from full power at any time in core lif What are five of the six positive reactivity
' effects that may need to be overcome by the injected solution? (2.b) lhe Reactor Water Cleanup System continuously circulates water through Filter /Demineralizers to assure high water purit Give three reasons for maintain 1ng the water purit (1.b) Why is any increase in the conductivity of the water at the outlet of the Filter /Demineralizers as indicated in the control room considered to be a serious condition? (1.0) Moisture Separators are in the steam flow path between the high and low pressure turbine Their primar) purpose is to remove moisture from the steam to protect the turbine blade They may also increase cycle efficienc Briefly explain how the moisture separatort may increase cycle efficienc ,, A figure may help with your explanatio (1.b) he Rod Worth Minimizer is provided to protect against the consequences of a rod drop acciden When is the RWM not required? (0.b) Briefly explain from a reactor physics point of view why the RWM is not required in the power range you have indicated in Part Give at least two reason (2.0) The Reactor Water Cleanup System uses two types of heat exchanger These are known as the ret-nerative and the non-regenerative heat exchanger . What is the primary difference between these two types of heat exchangers? (1.b) What is the principle advantage of using a regenerative heat exchanger in the HWCU system? (1.0) Category Continued on Next Page NO Examination Page 2 of 12 L _. .
. _ . - - - . . . - - - _ ~ _ - -. _- . . _ _ - . - -. . .. . August, 1Yub Millotona Unit 1 . During a reactor startup, the neutron count rate measured on the SRMs has increased to 500 cps at which point the Reactor Engineer states that Keff ,
as 0.Y As the Reactor Uperator, you withdraw eight control rods an additional two notches eac The count rate increases to 4000 cp Is the ' reactor critical? Justify your answer with at least two arguments or method (2.6) 1.10 State how the channel quality will change (increcee, decrease, or remain the same) for the following instantaneous parameter changes. Assume a position in the channel about three feet from the core top, and the reactor operating at 80 percent
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powe Power increase (0.6) Channel flow increase (0. 6 )
. Decrease in inlet subcooling (0.b) Pressure increas (0.b)
1.11 lhe Doppler coefficient of reactivity is important in the limiting of transients during reactor operation.
J Briefly describe what is meant by Doppler broadenin (0.5) Why does the Doppler Defect continue to increase as fuel temperature increases while the Doppler Coefficient decreases as the fuel, temperature increases? (1.0)
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End of Category i RU Examination Page 3 of 12 _ . . _ . . _ ,_ _ _ - . _ _ _ _ _ _ _ _ _ _ _ _ ._ _ _ _ _ . _ _ _ . _ _ _ . _ - . . _ . _ ._
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, August, 1986 Milleton2 Unit 1
. PLANT DESIGN, INCLUDING SAFE TY AND EMERSENCY SYS TEMS (2S) The Isolation Condenser is a standby, high-pressure system for removal of decay heat following a reactor a reactor isolation scram, If the water level is normal at the time of IC automatic initiation, how much time do you have to provide makeup if 1-IC-10, the automatic fill valve, fails to open? 1 hat is, how long will the IC operate without shell makeup? (O.b) What is the normal standby valve lineup'? (l.S) How does the valve lineup change when the IC automatically initiates? (1.0) UP 206, Plant Cooldown to Cold Shutdown, requires that the Reactor Vessel Head Cooling System be placed in service to assist in even cooldown of the vesse Ihis system uses the backup Control Rod Drive pump to supply water to the spray nozzl If the operating CRD pump fails (the pump that is supplying water to the CRD system) during a cooldown, can operation of the Head Cooling System centinue? Explain your answe (2.0) The Instrument and Station Air Systems are crosstied to permit either system to be provided with air from the other system s compresso ~
How is the Instrument Air system protected from a failure in the Station Air System that causes Station Air pressure to drop? Include the
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setpoint and the action that will occu (1.0) If Instrument Air pressure drops, at what pressures and what actions will occur to maintain Instrument Air pressure? (1.6) Category Continued on Next Page RO Examination Page 4 of 12
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August, 198b M1110tona Unit 1
. lhe Feedwater Coolant Injection System uses normal components of the Feedwater and Condensate Systems to provide emergency water to the vessel under small break condition What signals will initiate FWCl? (1.0) How does FWCl cause vessel depressurization? (0. 5) lhe Feedwater Regulating Valves operate in either Flow Control or Level Control mode When FWCl is initiated after a loss of normal power (LNP), what mode will the FRVs be in when injection starts, and what will cause the FRVs to change between the two operating modes? (1.5) The Vital AC Bus is 4Whdesigned to receive an "uninterruptible" supply of powe Power is available from three sources, two of which may be considered normal, and the third alternat Briefly describe how the Vital AC Bus receives power from these three source (1.6) If the power source switches between the two normal supplies, no loads will be los However, if power switches to the alternate supply, some plant loads may be los Briefly explain why this occur (1.0) m Each Safety / Relief Valve Discharge Pipe has-t" r vacuum breakers installe ^ What condition would cause the vacuum breakers to openY (0.5)
. What two adverse effects could result if the vacuum breakers did not perform their intended function? (1.5) Category Continued on Next Page RO Examination Page b of 12
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. , August, 1985 Milletono Unit 1
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2./ The Turbine Building Secondary Closed Cooling Water
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System includes two 100 percent capacity pumps and two 100 percent capacity heat exchanger Why must SCCW flow be directed through both heat exchangers? (1.0) How is SCCW temperature controlled? (0.6) The SCCW pump discharge pressure must be maintained greater than 90 psi (1) Why is this necessary? (2) If the discharge header pressure falls below 90 psig, why should the second pump not be started? (3) What should be done to maintain pump discharge pressure? (1.5) The Low Pressure Coolant Ir.jection System includes two independent loops connected by a crosstie heade Explain the purpose of the crosstie lin What are the crosstie valve (1-LP-BA) positions during LPCI standby and operating conditions? (1.5) The Heactor Recirculation System contains two separate loop Each loop has either suction or return connections for several other plant system List these connections for each loo State whether each connection is a suction or a return pat (2.5) 2.10 The Core Spray System pumps may receive power from more than one sourc What are these power sources, and what will the start sequences be for the pumps if normal power is available, and if normal power is lost? ~ be sure to include the buses as well as the source of power to the buses. (3.0)
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End of Category A HO Examination Page 6 of 12
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, August, 1985 Milleton? Unit 1 . INSIRUMENIS AND CONIRULS (25) The 24 Volt D. C. Electrical System supplies power to the SRMs and other nuclear and process *
instrument . Will SRM operation be affected if the 120 V.A.C. power is temporarily lost to the battery chargers? Why or why not? (1.0) Upon receipt of the 24V Battery Charger 1A 1 rouble alarm, you determine that the voltage is zer How can you determine whether the Wattery Charger has shut down due to a low voltage or a high voltage condition? (1.0) During a reactor startup, power has been temporarily leveled on Range 7 of the IRM I+ the Range Switch is ogt changed, at what teading will each of the following alarms occur if power drifts either up or down? Include the automatic protective action that will be initiate IRM DOWNSCALE (1.0) IRM HIGH (1.0) IRM HI-HI (1.0) The Reactor Protectio. System receives signals from many plant systems to shut down the reactor when potentially unsafe conditions arise. One such
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event is the closure of the turbine stop valve What is the setpoint for receipt of a scram
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from stop valve closure? (0.6) When is this scram function bypassed? (0.5) With the reactor operating at 60 percent power, will partial closure of Stop Valves 1 and 4 result in a reactor scram? Explain your answe (1.5) Category' Continued on Next Page RO Examination Page 7 of 12
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August, 1985 Millstona Unit 1 The Rod Block Monitor System is designed to prevent local fuel damag Why are the preset limits on local power a function of flow rate? 1.0) Why is recirc loop flow used rather than core flow? (1.0) Accumulators in the Hydraulic Control Units assure that the control rods will fully insert on receipt of a scram signal at any reactor pressur Accumulator pressure normally floats at CHD pump discharge pressur What will happen to accumulator pressure if the running CRD pump trips? Why? (1.5) l After a reactor scram occurs, when the accumulators need to be recharged, what assures that the CRD pump does not go into runout? (0.b) According to OP 336, Core Spray System, the " Core Spray Header A (B) Hi Dif Pressure" alarm windows are normally in an alarmed state at cold shutdown or as cold conditions are approached as the reactor is being shutdow During normal reactor at power operations, what is indicated if one of these windows alarms? (1.0) ' Why are the windows normally showing alarmed status when the reactor is cold? (1.0)
. An Anticipated Transient Without Scram System provides a redundant safety grade control '
capabilit What two actions are taken by this system to assure insertion of negative reactivity? (1.0) What conditions will initiate the actions listed in Part a 7 Include any time delays 2nvolved, and the combinations of these , conditions that are necessar (2.0) l Category Continued on Next Page RO Examination Page 8 of 12
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, August, 1985 Milletone Unit 1
. Ihe reactor has been operating at 80 percent power for three days about three mor.ths into core lif The Master Controller has f ailed high, and so each loop is being operated in Loop Manual Contro Lxplain what will happen to the recirculation pump speed for each of the following independent, separate, and unrelated event The Discharge Valve in the A Loop begins to slowly drif t close The drifting stops at about a 70 percent open positio (1.0) The reactor operator inadvertently switches the A Loop M/A Transfer Station to Aut (1.0) The Speed Controller output f rom the A Loop Controller fails to zer (1.0) The reactor power level has been stabilized at about BO percen The Level Master Control Station is in Manual, and it is desired to switch to Automati Manual operation has not stabilized with the deviation pointer nulle Briefly outline two methods for nulling the pointer before switching to auto and stabilizing the water level. (2.3)
3.10 The Turbine Control System contains a pressure control unit that consists of two independent pressure regulators and a bypass valve opening Jac tit-F the reactor operating at full power, why 15 it preferable to control with the EPR rather than the MPR7~ (1.0) You are directed to switch operation to the MPH so maintenance can be done on the EP (1) As you adjust the MPR to take control, will its servo position increase or decrease? (2) What will the f3nal servo position be for the EPH after the MPR has taken control? (1.0) Why shouldn't the bypass valve opening Jack be operated while the turbine is on line? Where is it positioned during normal plant operation, and what could happen af it is taken from this posi ti on'? (1.0) End of Category RO Examination Page 9 of 12
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Augunt, 1985 Millstone Unit 1
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l PROCEDURES - NORMAL, ABNORMAL, EMERGENCY, AND RADIOLOGICAL ! CONTROL (25) 4.1 The Pre-Critical Checkoff, OPS Form 201-1, requires
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the Control Operator to verify in Step 19 that power sources are available and buses are energized in accordance with Tech Spec 3. What are the l five conditions that must be satisfied? (2.5) 4.2 You have been dispatched to the Reactor Feedpump area to investigate a decreasing lube oil pressure condition. Upcn arrival, you discover a small oil leak, and a fir According to ONP 505, Fire, what are your immediate reporting and action requirements? (2.5) l 4.3 Large motors may overheat if excessive starts are l attempted in too short a period of time. According ' to OP 301, Nuclear Steam Supply System, what are the limitations for repeated starts of the l Reactor Recirculation System G. Set Drive Motors with the moto either hot or cold? (2.0) 4.4 According to ONP 507, Loss of Vacuum, if a low vacuum alarm is received at 26 " Hg, you are to l attempt to stabilize the vacuum by correcting the l caus Checking the recorder, you note that vacuum , has been decreasing at a rate of about one inch per l hour, How much time do you have to find and correct the cause of the decrease in vacuum before a reactor scram may occur? (0. b) If after some time.of investigation, you have j not been able,to determine the cause, and ! vacuum is continuing to decrease, what specific , action could you take to slow down the rate of l change of vacuum? (0. b ) If vacuum continues to decrease, and the l reacter scrams, how long can the main condenser be used as a heat sink? (0.5) Category Continued on Next Page l l ,
RO Examination Page 10 of 12
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August, 1925 Millotona Unit 1 It is 6:40 a.m., and your shift is scheduled to start at 7:00 a.m. A small leak has occurred that' has not yet been identified, and reactor water level is fallin The reactor has shut down and the EOPs have just been entere According to ACP 6.12, Shift Relief Procedure, if all members of your shift crew have arrived in the Control Room, can the shift turnover process begin? Why or why not? (1.5) What are the five entry conditions f or the three Reactor Pressure Vessel Control procedures, EOPs 570, 571, and S72? (2.5) Water in the Reactor Building Closed Cooling Water System is cooled by the Service Water System in three heat exchangers. OP 309C, Reactor Building ' Closed Cooling Water System, contains several precautions and requirements concerning the interaction of these two water system _ The RBCCW heat exchanger outlet temperature is normally controlled by manipulating the heat exchanger bypass butterfly valve, and not the Service Water outlet butterflies, but.there is one significant exception to this cautio . sunder what conditions may the Service Water butterfly valves be throttled? (1.0) When the RBCCW System is being placed in service, should the RBCCW side of the heat exchangers be cut in first, or should the Service Water side b,e cut in first? Why? What about when the heat exchangers are secured? (1.5) Acco.rding to ONP 515B, High Conductivity After Condensate Demineralizers, What five indications (recorder readings and/or alarms) could you have that a failure to clean the water was occurring? (1.5) If these indications were verified, what five immediate actions are required? (1.5) Category Continued on Next Page RO Examination Page 11 of 12
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, August, 1985 , Milletony Unit 1
. According to OP 360, Stack Gas Monitoring System,
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i. .What recorders should be checked as part of.the
,, immediate operator actions to confirm a high or high high alarm condition? (1.5) . , What concurrent alarm condition.would lead to a .
reduction a n reactor power to reduce radiation levels in the stack gas? <
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4.10 You are operator in the Control Room when a leak
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occurs in the Reactor Clean-Up-Syste According to ONP 516, ' What indications would you have of this event in the Control Room? (1.5) What immediate actions would you be required to take? (1.0)
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4.11 Condenser vacuum-is. established initially by use of
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a mechanical Dacuum pump which, according to OP 324A, Condenser Air Removal System, may be used only at low reactor powe . By what' power level must the mechanical vacuum 1
.,! pump be taken off line7, (0.25) Why cant the mechanical vacuum pump mesa be used above this power level? (1.0) When the mechanical vacuum. pump is taken out of service, what action is required, includang the , action inside CRP 907, to assure the safety of the pump? (0./5) 'If the reactor was above this power level, how could you test the mechanical. vacuum pump? (O.S) ,
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End of Exa,mination ' .
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RO Examination Page 12 of 12 n _ . _ _ . _ . . . - - _ m, , , , - . , . . - _ . , _ . , , , , _ _ _ _ . _ . . _ _ ,_ , , _ . . , _ . _ _ _ _ _ . _ _ _ , _ _ . _ _ _ .
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.' f*= ma v = s/t Cycle efficiency.= (Network * ,
out)/(Energy in) w = mg . s = Vg t + 1/2 at 2 2_ E-= mc
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KE.= 1/2 my A = AN A=Aeg a = (Vf - Vg )/t PE =.m9h V7 = V, + a t w = 0/t A= tn2/t1/2 = 0.693/t1/2
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- t 1/2*If * E(elm)IE b)3
[(t1/2) * Ito))
aE = 931 am
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I=Ieg Q = mCpat Q = UAa T I = I_g e-"* Fwr' =' W an I=I g 10-x/TVL f TVL = 1.3/u
-P = Pg 10 "#(*) - HVL = -0.693/u p = pge /T t ,
SUR = 26.06/ SCR = S/(1 - Keff) CR x = S/(1 - Keffx) SUR = 26p/t* + (8 - p)T CRj (1 - Keffl) = CR2 ( -keff2)
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T=(t*/o)+[(a-o)/$o] M = 1/(1 - Keff) = CR /CR j g T = 1/(p - s) M = (1 - Keffo)/II - Keff1) T =.(a - o)/(lo) , SDM = (1 - Keff)/Keff a = (Keff-I)/Keff " #'eff/ eff t* = 10- seconds
. T = 0.1 seconds-I a = [(t*/(T Keff)) * E eff/(1 + T)] . Id j j=Id P =;(rov)/(3 x 1010) Id 2 ,2 gd
j j 22 I = oN 2 R/hr = (0.5 CE)/d (meters) Water Parameters Miscellaneous Conversions 1 gal. = 8.345 lb curie = 3.7 x 1010 dps 1 ga[. = 3.78 liters 1 kg = 2.21 10m 1 ft* = 7.48 ga I hp = 2.54 x 103 Btu /hr Density = 62.4 lbm/ft3 1 ms = 3.41 x 106 Btu /hr Density = 1 gm/cm3 lin = 2.54 cm Heat of vaporization = 970 Btu /lem 'F = 9/5'C + 32 Heat of fusion = 144 Btu /lbm *C = 5/9 (*F-32)
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1 Atm =.14.7 psi = 29.9 in. H . A
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Auguat, 1985 * Millstona Unit 1 . PRINCIPLES OF NUCLEAR POWER PLANT opt 1 RATION, THERMODYNAMICS, HEAT TRANSFER, AND FLUID FLOW (25) - ANSWERS Notch override may not be used again until the point of adding heat is achieved. LThis seems to be above 100 */. on Range 6. 3 (1) For startups f ollowing a reactor shutdown, either a planned shutdown or a reactor scram, conditions of high Xenon will
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exis (0. S)
(2) Xenon will be higher in areas of the core where the flux was highes This will tend to depress the flux in these areas and cause the flux in areas of the core where the flux was previously low to be highe This will cause the reactivity of the control rods to iscrease in the previously low flux region In particular, rods in the periphery of the core, and near the top, will tend to have higher reactivity worth (1.0)
(3) If caution is not observed, a short period may result Cleading to an IRM scram (0.5)
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REFERENCE: OP 201, Precaution 4.6, Steps and 5.5, Reactor Theory Manual, 6-11 - 6-1 .2 (1) Two regions are used for core orificing. The central region consists of all but the outermost ring of perimeter fue The outer region has smaller or fewer orifice (2) The orifices add a relatively large dP to the total dP across the cor The dP added by boiling is then insignificant compared to the ' dP of the orifices, and so the dP is nearly the same (as is flow) to all fuel cells under any condition of powe REFERENCE: Thermo & Fluid Flow, ppg. 12-21 - 12-22, Lesson Plan, Reactor Pressure Vessel and Internals,
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ppg. 29 - 30, Figures 15 and 1 I
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RO Examination Answers Page 1A of 16A l
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Augunt, 1985 Millstone Unit 1
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,V Q As the heatup continued, the water temperature would begin to steady out at the saturation temperature for the vented syste This wi11 l gp " [ y'f-y g*/ k*/'be higher than 212 ,
F since it wil1 track the
- . d" vessel pressur (0.75) /'A Yke .P Vessel pressure will continue to increase, but W , y/p(h) - .J wi11 be maintained slight 1y above atmospheric / due to the backpressure f rom the vent line f \v (0.75) *
W M A L semp vsJs k W b/A , b/N Psoows M *vt-n N}
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VY [(h) Since the pressure is not increasing, and the e
(, temperature increase has been slowed, the heatup rate will decreas * pp' % [&&g (0.5)
[p Y power will be maintained by the operator and should stay at steady statey n Le^tW Ad WE' * g ['f,/ (h,8,Reactor e . However, since the temperature is not Pd *'d'"- ".
^" h
/ g r- A[/[ 7g
increasing at the earlier rate (70 F), control rods will not need to be withdrawn as much to compensate for the moderator coefficient of d */*be gp)g.J. 9 # P r eacti vi ty. A' m b*i Ug ocW ksown , 6 3 (1.0) QV f f+-]gd' {, vuf a as ti .5q M oc.c m , 9 /v f REFERENCE: Thermo & Fluid Flow, ppg. 1-23f., Reactor Theory, ppg. 4-8 .4 (1) Elimination of steam voids .
(2) Moderator temperature shift from hot to 125 F (3) Reduced Doppler effect (4) Decreased control rod worth as moderator cools (boron in competition with control rods) (5) Xenon decay (6) Shutdown margin of 2. 6 */.
0.6 for each of any fiv REFERENCE: LP # 1304, p . Category Continued on Next Page
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RO Examination Answers Page 2A of 16A
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August, 1985 Millstona Unit 1
. (1) _ Reduce damage to components due to chemical and corrosive attac (2) Reduce foulino of heat transfer surfaces and mechanical part (3) Reduce impurities available in the water for activation by neutron flu (4) Maintain clarity for fuel handling (Not in Lesson Plans, but acceptable answer.). The demin beds operate with a low conductivity output for a long tim When the conductivity begins to 2ncrease, it increases very rapidl The reason is that ions break through, and the f2rst to break through are the worst for operation - namely the chloride REFERENCE: LP # 1303, ppg. 13, 14 and 2 .6 Cycle efficiency may be increased as shown on a T-s diagram by extending the turb2ne's ability to remove energy from the stea By removing moisture from the steam, the mixture becomes dryer, and the line moves closer to the saturation line at constant temperatur This enables'the turbine to operate with additional stages, and thus reduces the turbine exit temperatur This causes the area under the T-s curve that is subtracted as waste energy to become smalle T I
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I l i Moisture Removal, I
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h0 Q /// //f//) s REFERENCE: Thermo & Fluid Flow, pg. 4-19 and Figure 4-1 Category Continued on f4 ext Page RO Examination Answers Page 3A of 16A
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August, 1985 Milletona Unit 1 . a. The RWM is not required at power levels greater than 20 percen (1) At higher power levels, the voiding in the top of the core causes a flattening of the axial flux profil This reduces the peak to average flux profile surrounding the control rod, and reduces the reactivity that would be inserted if the rod droppe (2) At higher powers with more control rods withdrawn from the core, the effect of the rod drop would be distributed over a
., larger core region, resulting in lower heat generatio REFERENCE: LP # 1409, RWM, pg. .8 a. The regenerative heat exchanger uses the same fluid for the cooling side as is used on the cooled side of the coil The non-regenerative heat exchanger uses a ~~
different fluid (RBCCW) from the cooled flui %. b. The use of the regenerative heat exchanger reduces the heat loss from tge plant because it returns heat back to the clean-up wate REFERENCE: Thermo & Fluid Flow, pg. 5-3 and Figure 5- . Category Continued on Next Page
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RO Examination Answers Page 4A of 16A
. , August, 1985 Millotona Unit 1
. N (0.5) (1) If the count rate has leveled off, that is, it is not continuing to increase at a steady rate without additional control rod motion, the reactor is not critica (2) From the equation CR1/CR2 = (1 - K2)/(1 - K1),
it can be shown that K2 = .9987 or Using the count rate doubling technique technique, the same result can be shown:
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500 0.99 1000 0.995 2000 0.9975 4000 0.99875 . REFERENCE: Reactor Theory text, ppg. 3-5 - . .,.., 1.10 D:: r r --" 18% Decreases ,
~ Increases - Eless power required to cause
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boiling] 4, Decreases - EVoids collapse] REFERENCE: Thermo & Fluid Flow, ppg. 8-32 - 8-33, 8-58 0 #1 Category Continued on Next Page RO Examination Answers Page SA of 16A
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August, 1985 Milletons Unit 1 1.11 Doppler broadening is the broadening of the resonance peaks as temperature increase This causes the probability of absorbing a neutron to increas As the temperature increases, the peaks broade As temperature continues to increase, the peaks don't broaden as much per unit change in temperatur This causes the Doppler coefficient to decrease as temperature increase (0.75) However, the Doppler defect is the total amount of reactivity inserted by the Doppler effec It will always increase as f uel temperature increases, though at a sl owing rat (0.25) REFERENCE: Reactor Theory, ppg. 4-33 - 4-4 End of Category
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RO Examination Answers Page 6A of 16A .
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August, 198b Millstone Unst 1 PLANT DESIGN, INCLUDING SAFETY AND EMERGENCY SYSTEMS (25)
- ANSWERS minutes IC-1, 2, 4, 6, and 7 are ope IC-3 is close IC-3 opens, and -6 and -7 clos REFERENCE: LP # 1307, IC, p , and OP 30 .2 Yes (0.5)
If the operating CRD pump fails, the backup pump must be used to supply the CRD syste However, the valves may be manually positioned to provide a reduced flow to the Head Spray System by reducing the cooling water header flo REFERENCE: OP 206, Step 5.11, OP 306, Steps and .3 On low pressure in the Station Air header, at 80 psig, the Station Air header isolates Eby closing 1-SA-24 /(1) When In trument Ai pressure drops to 93
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p *4 gQf (
- psi g , St tion A' is supplied to Instrume . Air Lthrough 1-SA-213.
d g WgMy 7) r(2) If Instru Air, and Air is supplying Station pressure drops to 80 psig, 4 (gV'd ped the SA ad will isolate Et3y closing 1-g*#p- d SA-24 g i
, (3)- If I is supp ving SA, and IA Receiver -
g,% pr ssure drops to 90 psig, air flow to SA all cease Eby losing 1-IA-18 REFERENCE: LP # 1333, pg S, and Figure @ 90 pig L IA GAS % SA wp^assar6 sM2 Category Continued on Next Page IA (*)@ So psih b TA 44c5m, CIA-18) 910 carpla 4o SA dans (3) @ 85 f iig 6 IA hedn, SA compressss SM
% LP GE3A, pg 3-6 L? 1333 P,,, fj 7 6J Op $
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RO Examination Answers Page 7A of 16A
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August, 1983 Millstone Unit 1 High Drywell pressure (2.0 psig) and/or LoLo Reactor water level (-48 inches) By injection of cold water (not heated by extraction steam) ' rom the Hotwel The FRVs will be in Level Control [when the feed pump discharge pressure reaches 300 psig3 and F9 g y injection first start (0.5)
'N If the flow reaches 105 percent, the FRVs will (0.25)
Om*"E switch to Flow control Eto prevent pump runout 3m 1. k%* k *d * 3 7 ', until the level returns to 37 inches sw FgP DscL Pc (d 25) 2 .o r . A* MS 'd 4he-FftVs wH-1 -remain in-level--cw.tr ci-- w letti-- or ',
-*F- Ah*~+I C"'~ F*** * "S ~ bel ow--4 05, percent.- - , (C W t-3.b-e d;5dt ,? * n ,
f 3 o es , - o,27 REFERENCE:LP # 1334, ppg. 5, 10, and 1 LP 88 1314 j rrg . M-2A The first source of power is normal AC [from MCC-E53 to the AC powered generator drive moto (0.5) If the normal AC is lost, an automatic transfer to the DC supply Efrom 101 AB-33 occur This provides power to the generator DC drive motor.(0.5) If both normal supplies are unavailable, an automatic transfer occurs to the alternate supply [ IV-1 from MCC-F5 (0.5) Both auto transfers are break before mak (O.h) The transfer between the two normal supplies will take place without loss of loads
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because of the flywheel maintaining voltage during the transfe (O.8)
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REFERENCE: LP # 1343, pp , and Figure .6 Underpressure in the line (1) A water slug would be drawn up into the line, and when a valve operation occurred, the slug would be driven into the g suppressi on pool , causing excess stresses. (I.0 /
(2) Underpressure in the pipe would affect relief valve setpoin the(0T)
REFERENCE: LP # 1337, pg. Category Continued on Next Page RO. Examination Answers Page 8A of 16A
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, August, 1985 Millotone Unit 1 1 The maximum flow through each heat exchanger I4 d.ed4 should be kept below 900 gpm.K The pumps wi11 W ft, k each deliver 1800 psi Q %Q By use of a heat exchanger bypass valv kes w4 & .krw- (1) To prevent pump runou (. 0 .C} m g.4wo.Alta h 1
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Excessivesystemflodw will resul CAxe rob m Hx M (3) Throttleo the
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Iqq n g, REFERENCE: OP 3098, Sections 6.3 - 6.5, and dW * LP # 1309, pp(17 -- ; 7.- The crosstie line provides for the injection from all four LPCI pumps into either Recirc lin The 4*0 loop selection logic will determine which loop may be broken, and will direct LPCI flow from the LPCI system normally injecting into the broken loop into M_y ,, u I
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the other loop through the crosstie lin J1.0) .., The crosstie valve is open during standby and op er'JIt i on . (O.5) REFERENCE: LP # 1335, ppg. 6 - 2 .. System Loop A Loop B LPCI Return Return (0.5) RWCU Suction (0.5) S/D Cooling Suction Return (0.5) Sample System Suction (0.5) Iso Cond Return (0.5) REFERENCE: LP # 1301A, pg. 20 and Figure Category Continued on Next Page RO Examination Answers Page 9A of 16A
.. . - . , .. August, 1985 Millstone Unit 1
2.10 (1) Pump Bus Normal LNP Supply Supply A 14F NSST* DG (0.75) B 14E NSST* GT** (0.75)
*Dn a reactor trip, the power source will auto transfer from the NSST to the RSS Either answer is acceptabl **[Through a tie breaker from 14C.] (2) If normal power is available f rom either the NSST or the RSST, the two pumps will start si mul taneousl (0,5)
On an LNP, the B pump will start immediately, and the A pump will start with a 10 second time d71a (1.0) REFERENCE: LP # 1336, pg. 7, and LP W 1340/1341, ppg. 5-6, and Figures 1 and . e
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RO Examination Answers Page 10A of 16A
, , August, 1985 Millstone Unit 1 INSTRUMENTS AND CONTROLS (25) - ANSWERS The channel will not be lost until the associated battery is sufficiently discharge If the charger is returned to service in time, there will be no effect on SRM operatio An operator will need to check all breakers and fuse If they are all normal, then the charger has tripped on a high voltage condition
[at 32 volts REFERENCE: LP # 1344, p , and OP 344B, p . (3/125) * 40 = 0.96 (or 1)
Rod Block (108/125) * 40 = 34.56 Rod Block (120/125) * 40 = 38.40 Scram REFERENCE: LP # 1402, pg. 1 .3 Less than or equal to 10 percent full open This scram is bypassed at less than 45 percent power as sensed by turbine first stage , pressur N ,
(0,5)
The trip system is designed so that closure of any two valves will not result in a scram. Any third valve closing will then cause a scra This particular combination will not result in even a half scram (combinations of valve numbers that add up to five). Other combinations will give a half scra [ Note: This trip logic is the same as for the MSIVs.] REFERENCE: LP # 1400, ppg. 13 - 15, Figure Category Continued on Next Page RO Examination Answers Page 11A of 16A
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August, 1985 Millstone Unit 1 Because thermal limits (MCPR) are based on the ability of the coolant to remove hea Because recirc loop flow has less short ienn variation and therefore produces more stable trip level REFERENCE: LP # 1410, p . The pressure will stay constant for a while, then slowl leak off through eals.and +ho 17
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check val ve. . . . , _ . . . . Wh A &&2D (J.dr) d' check'~ Valve in the charging water line will mai ntain the pressure in the accumulator (9/5) .? I L -+ g A restricting orifice in the charging water M 1in [[ r REFERENCE: LP # 1302B, ppg. 14 - 1 +ff.fg, The alarm indicates a possible loss of
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integrity of the header between the shroud and [ 6 vessel wal ~'- '} The 'dP sensors are calibrated for hot - u{ condition Sensed pressure will decrease with gyg d,
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decreased temperature of the reacto .
' [ Normal reading is 4 psid, and the alarm point Tk nwe fbur is 2 psi d"N O N b Sq edhi kW REFERENCE: OP 336, Section 8.3 and 8.4, anu ga.puser LP # 1336, ppg. 10 - 11, and Figure p h . A c,4 ptd *
W n .As m ir .7 (1) Vents the scram valve pilot air header @ duas 4%
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theough two redundant ARI valve yos m thenw,; *
(2) Trips the recirc pump MG Set field 444 nhv . ov44-breaker (1) Hi reactor pressure C 1150 psig] (0.25) (2) LoLo water level E-48 "] with a 9 set TD (0.5) (3) Manual (0.25)
Each Division ( 1 and 2 ) has two subdivision Either Division can cause ARl/RPT initiation if any one of the above, or combination of the above, is sensed in each of its subdivision (1.0) REFERENCE: LP # 1408, Appendix A, and Figure B- Category Continued on Next Page RO Examination Answers Page 12A of 16A .
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August, 1985 Millstone Unit 1 a. -The pct.p ap :d .;ill go to 20 p r nt 2: "Ike 94m Y e c ce by u,m : . c sm m J; 4 A :. d g b ,r 7% f5 k q w 9 a qb thV. -trona l The pump speed will go to the high speed (Q 83 setting of the Master Controller Speed Limiter
- 102.5 % of rated speed (or 102.5 % of rated core flow with rated speed being 92 % to produce 100 % core flow with both pumps running).
.- The pump speed will stay the same as the Signal Failure Detector produces a scoop tube locku REFERENCE: LP # 1301B, ppg. 8, 9, and Figure ... (1) With the Master Controller in manual, raise the reactor water level with the manual pot until the deviation meter is nulle Then switch to aut (2) With the controller in manual, change the set point to null the deviation mete Then switch to auto, and return the set point to the desired settin REFERENCE: OP 316, Section . , 3.10 The MPR works as a backup to the EP With the MPR i n control , there is no backup controller should the MPR fai (1) The MPR servo position will increase to match that of the EP .
(2) The EPR servo position will slowly decrease to zer , The BPV opening Jack can override the pressure regulators and open the control and/or bypass valves further than the MPR or EPR calls fo This will lead to a pressure decrease, and a possible scram at 825 psi For this reason, the jack should be placed at its lowest position during normal reactor operatio REFERENCE: LP # 1314B, ppg. 2-3, and OP 314, Sections 7.8.4 and 7. End of Category RO Examination Answers Page 13A of 16A
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. August, 1985 Millstone Unit 1
. PROCEDURES - NORMAL, ABNORMAL, EMERGENCY, AND RADIOLOGICAL CONTROL (25) - ANSWERS . One 345 kv line and associated equipment capable of supplying aux. powe . Both emergency power sources operabl . An additional source capable of supplying power to the emergency buse EEither .6 kv line, switchgear, and transformer One 345 kv.1ine h - p,y y buse A5_and D nergized Cand the associated 480 buses eMerQTze . All Estation and switchyard 24 and 125 volt]
batteries and associated battery chargers are operabl REFERENCE: OP 201, Form 201-1, Station Procedure or Form Change, 201-1, Rev. 8, Change 1, and TS Section - 3. .2 (1) Report to the control room (0.3) location (0.3) type of fire (0.3) size of fire (0.3) components affecte *
(0.3) (2) Ensure there are no injured personne (0.5) (3) Fight the fire if a qualified fire fighte (0.5)
REFERENCE: ONP 505/AOP 2559, p . With the motor cold, two consecutive starts are allowed.( 9Following the secogd start, the motor must run for, t least 30 min 7ar must be idle for at least 60 mi6 efore another start is attempte Fr6+
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With the motor hot, do not attempt more than one (-breb start.(09Thensameasabov . REFERENCE: OP 301, Step 6.11 as revised sometime between 12-2-82 and 1-17-8 Old procedure and lesson plan still show old value " About two hours until 23 Hg is reached Decrease reactor power
.d h
lisled k h
M d Ac4 W ,
. Until 7 " Hg is reache ^ S M h bdd MMih REFERENCE: ONP 507, ppg. 1 - Category Continued on Next Page RO Examination Answers Page 14A of 16A
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, August, 1985 Milletona Unit 1
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ACP 6.12 states "The plant shall be in a controlled condition at the beginning of the shift turnover process." (1.0) oc vcs tt MgCP 6.12,e conSection REFERENCE: b ii d en dWk * (1) RPV water level less than +8 .
(2) RPV pressure greater than 1065 psi (3) Drywell pressure greater than 2.0 psi (4) An isolation condition exists which requires or initiates a reactor scra (5) A ctndition which requires a reactor scram and reactor power is above 3 percent or cannot be determine ,,
REFERENCE: EOP 569, pg. . fWhenthreeheatexchangersareneededduring plantcooldown,]it may be necessary to throttle the Service Water outlet butterfly valves to cover the heat exchanger tube (1) Establish the RBCCW flow before cutting in the Service Wate (2) When securing the RBCCW, secure the Service Water side firs (3) This is pref erred to minimize any leakage from the salt water side to the RBCCW and its load REFERENCE: OP,309C, ppg. 3 and .0 Increasing conductivity would be indicated on (1) Cond. Booster Pump discharge recordersL Sof ed 63b (2) Feedwater Conductivi ty recorders {rw 930 Alarms that might be received are (1) Booster Pump dischg cond. hiON1 g 939]
(2) Booster Pump dischg cond. hi h (3) Feedwater High Conductivity [0.2 umho)% 907) (1) Scram the reactor (2) Close hotwell reject to the CST [1-CN-67 and 69] (3) Trip all operating reactor feed pumps (4) Close FW Blocking valves [4A, B, & C3 (5) Close MSIVs and place the Iso Cond in servic REFERENCE: ONP 515B, ppg. 1 - Category Continued on Next Page RO Examination Answers Page 15A of 16A
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. * . , . August, 1985 Millstone Unit 1 . (1) Stack gas radiation recorder (2) Off Gas recorder (3) Flux tilt recorder High Off Gas REFERENCE: OP 350, pg. .10 (1) Erratic pressure control (2) Erratic flow control (3) Clean-up Retirc pump trip on low suction pressure [10 psig3 (4) Non-regen heat exchanger high temperature alarm (5) High area temperature (1) Isolate the leak .. (2) Scram the reactor if the leak cannot be isolate ,.
REFERENCE: ONP 516, ppg. 1 - ,, 4.11 Do not use above 5 percent powe #"
. There are significont amounts of hydrogen and , , oxygen present in the main condense Operation could result in combustion in the pum . The suction valve must be closed, (0.25) eNk and the Mechanical Vacuum Pump Ovarride Switch e, inside CRP 907 must be placed into the OVERRIDE p positio (0.5) 1 sh p [In this ponition, the valve will not operate.] # h,ek j g3 e It may be test run with the suction valve -) kk close s y#d 2, REFERENCE: OP 324A, pg. End of Examination RO Examination Answers Page 16A of 16A
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NORTHEAST UTILITIES d~
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August 15,1985 MP-S-T-755-85 TO: Frank Crescenzo h b w FROM: Michael C. Jensen Training Supervisor Millstone Unit 1 SUBJECT: Comments on NRC RO and SRO Examination (Written) Administered August 13, 198 please find attached comments on the written exams by question numbers. Questions that do not appear on the comment sheet have no comment All comments are not nesessarily points of issue, some are other plausible answer MCJ/gla cc: R. Z. Test R. J. Palmieri J. P. Stetz OS70 REV. 3-83
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A e 1.1 b (comment only) Operator will assume " cold, clean startup" by the stem of the question refering to OP-201 which covers the most complicated start-up. (i.e. cold, clean startup) b (1) Conditions resulting in high rod worth: Xe, Mod. Temp., Control Rod pattern, Control Rod location, et (2) Must know there la a significant Xe problem,
, which la not clear in the stem of the questio .2 (resolved)
Only need part (2) of answer key for full credi .3 (resolved) Answer key does not line up with question part number (1) Reactor power you would start to continously boil at 212 F but you could overcome this by pulling more rods and continue with startup and heatu (2) Water temperature will increase to 212 F, then you could continue to increase temperature with rod withdraw (3) Pressure would follow temperature as in part (2).
(4) H/U rate can be maintained Note: CRP-904 RMS operate head vent line are 1" valves to drywell equipment aum drain First indication may be higher than normal aump operatio pump (resolved) Moisture Separatora in our plant do not increase our plant efficiency,they and only preclude turbine bucket damag .10 (Resolved) As power increases by Control Rod withdrawal, quality increase N, C
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t 1.11 (Comment) We don't use the word Defect in our discussion of Doppler Coefficient or Reactivit .3 (resolved) 1-SA-21 no longer has any automatic featur Valve is failed open and tagged in that positio . (resolved) Conditions that cause FRV's to shift from flow control to level control 1) Rx Vessel level greater than or equal to +37".
2) Manual pushbutton depressed and held down 3) Feedpump discharge pressure drops to less than 300 psi . The last response in answer key (0.5 pts) is a repeat of statement (0.25) regarding FRV's remaining in Flow Control as long as feedflow remains less than 105 .7 (resolved) C (2) possible lifting of relief could also occur, with the potentional loss of inventory within the system and pump cavitatio .8 (resolved) First sentence in answer key answers first question aske Last sentence in answer key answers 2nd question asked. The 2nd sentence should not be required. Doesn't answer any question aske .6 (Comment) License canidates taught that redu-tion in core flow would cause the d/p alarm to be recieved, not reduction in moderator temperatur m,_ _ _ . _ _ _ _ _.._m
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e (resolved) The Recirc Mg Set drive motor breaker will trip if discharge valve leaves it open seat (provided 4 minutes has passed since the start signa .4 (resolved) Only action to reduce vacuum decrease that was accepted c was to reduce reactor power (Immediate Action).
Supplemental action steps also give actions to take to attempt to restore vacuum decreas . (resolved) Question asks for interpertation of the definition of -s
" Controlled Condition." The answer key should accept either yes or no provided the canidates Justifies the plant being or not being in a " Controlled Condition."
. (Comment) Requiring memorization of specific precautions in operating procedure .11 (resolved) parts C,D - Question requires memorization of operating procedure SRO Comments 5.03 (resolved) Equation as part of answer vice word answe .07 (Comment) Plant indications would be MWe increase, MWth increase causing cycle efflency to decreas h
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5.08 (resolved) b. We don't teach operators which Flow Control System (throttle valve or pump speed) is more efficient, that is a desigre engineering consideration W pump = UxPV efficiency could be: Thermodynamic, Operational, Design,
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Piping, et ., .
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6.02 (resolved) Pressing Flow Control reset button will force a reset to level Control, setting up a condition to cause pump rdnou * c.'-43 Seconds is not required informatio e 6.04 (resolved) Transfer to self-excitation occurs at 10 seconds, not at 8 second .06 (resolved) Question asks "Could valve be throttled with isolation signal present? Why or Why not? " Answer key requires, "No , valve will not throttle with isolation or Initiation sional present".
Question only asks if valve could be throttled with Isolation signal, does not ask if valve could be throttled with Initiation signa .11 (resolved) Indication of A and B as incorrect is not require .01 (resolved) Using delta The of BoF minimum level is closer to 12 fee L
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o , ,* e 7.03 (resolved) OP-302 7.15.4.2 and 8.19.4 both provide guidance to operator for action to take following continued rod out motion 7.08 (resolved) Service water outlet valves are normally throttled - not Just when 3 heat exchangers are needed for cooldow .10 (resolved) - Could be alert because question doesn't state
" Direct Observation of a Fuel Handling Accident."
8.03 (resolved) Correct answer is also "provided protection against pressure regulator malfunction which could cause control and/or bypass valves to open".
8.05 (resolved) Power Source requirements were in effect before LCO for SGTS resulting from failur Question asks " Continue under what Conditions." Power requirements assumed met prior to SGTS Inop and therefore, not require .08 (resolved) ACP.206 allows " Mechanical or Electrical equipment for Blue tags." Question could be true or false, depending on perception of questio # ,
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U ATTACHMENT 4 NRC RESOLUTIONS TO FACILITY COMMENTS The following represents the NRC resolution to those comments made by the facil-ity as a result of the current examination review polic Only those comments resulting in significant changes to the master answer key, or were "not accepted" by the NRC, are listed and explained below. Comments made that were insignificant in nature and resolved to the satisfaction of both the examiner and the Licensee during the post examination review are not listed f.e.: typographical errors, relative acceptable terms, minor set point change . Comment noted. However, the caution discussed in the question is in OP-201 and, as such, should not lead the candidate to assume " cold clean startup".
1.1.b.(2) The purpose of this question was to elicit this comment as an answe .2 This comment was not accepted. Both answers will be required for full credit based on examiners clarification of the question during the examinatio . 3 Comments accepted however, candidate will have to include a dis-cussion of drywell pressure and temperature change .6 This comment was not accepte Purpose of question was not to test the candidates knowledge of separator design but rather to elicit a thermodynamic discussion of steam properties in general. The question asks how "may" cycle efficiency be increased and the answer is dis-cussed in the lesson pla .3 Comment accepte Proper reference material provide .4 Comment accepte Proper reference material provide .7 Comment accepted. This is an acceptable alternate answe .8 Comment accepted. Second sentence in answer was not asked for in questio .6 Comment note However, examiners noted that when at minimum r:cfrc flow (as seen in control room) the alarm is not in. Calculation of temperature effect using steam tables indicates procedure is probably correc .07 Notaccepted, candidates should be aware for the reason (bases) for precautions. Specific word for word memorization not require y-- ,-,
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' Attachment 4 2 4.11' Comment considered during grading for system operation not memorizatio .03 _ Comment accepte This is an acceptable alternate answe .03 Comment accepted. Proper reference material provided. Candidates will be graded according to which section they select as answer.
. 8'. 03 ' . Comment accepted. Proper reference material provide .05 _ Comment accepted. Examiner misinterpreted applicable Tech. Spe .08 Comment accepte Proper reference material provide . }}