ML19345A325
| ML19345A325 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 02/01/1962 |
| From: | YANKEE ATOMIC ELECTRIC CO. |
| To: | |
| Shared Package | |
| ML19345A323 | List: |
| References | |
| NUDOCS 8011190092 | |
| Download: ML19345A325 (18) | |
Text
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- 7 50hA1:1 OPERATIN3 'NSTRUCTION NO. 50hAl FLANT STARTUP FRIMARY PLANT STARTUP FROM COLD CONDITION I.
Objective To provide a safe and efficient method of bringirg the prirary plant fros the cold shutdown condition to the hot standby condition.
II.
Conditions 1.
The main coolant system is filled with primary grade borated water and venting is being accomplished. Refer to 0.I. No. 50hD1, MAIN COOLANT SYSTEM - FILLING AND VENTING OF COMPLETE SYSTEM.
2.
The low pressure surge tank is filled to the normal operating level with primary grade borated water and is covered with a hydrogen gas blanket to a pressure of 1$ psig. The feed and bleed lines have been filled and vented.
3.
The pressurizer is filled with primary grade borated water, and the pressurizer vent valve is open, b.
The shell side of the steam generators are filled to normal startup level. The steam line non-returns are open, the drain and traps are closed and the steam generator vents are open.
5.
The pressurizer wide range and narrow range water level indicator is set for mindr a pressure compensation.
6.
Electrical power is available for all pressure control and relief system electrical equipment.
7.
All pressurizer heaters are de-energized and the surge spray and relief systen valves are closed.
8.
The pressurizer circalation spray control valve had been positioned such that the required circulation spray flow rate will be estab-main coolant flow.
e lished with occurrence c 9.
The following valves are open:
a.
Charging pump suction and discharge valves b.
Meter operated valve between the charging pump suction header and the low pressure surge tank.
c.
Pressurizer low level control valve in the bleed line.
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All valves in the feed line
- 10. A proper water balance is established to insure that adequate water for makeup and storage volume for waste water is available.
- 11. The critical control rod position has been determined, as firmly as possible, based on all available information and calculations.
- 12. Pertinent auxilary systems are in the following status L
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g+g Status Shutdown Cooling System In operation, if required (Refer to 0.I. No. 50hM)
Component Cooling System In service, as required (Refer to 0.I. No. 50hI) l _
Control System maintained on low pressure Primary Plant Corrosion 15 psig hydrogen gas blanket l
(Refer to 0.I. No. 50hJ) surge tank r
Chemical Shutdown
. Normal standby (Refer to 0.I. No. 50kG)
Purification System Ion exchangers isolated and (Refer to 0.I. No. 50hH) operating as required Reactor Control System Ready standby on Manual (Refer to 0.I. No. 50hN)
Unclear Instrumentation Normal operation System (Refer to 0.I. No. 50ho)
Radiation Monitoring System Normal operation (Refer to 0.I. No. 50hP)
Safety Injection System Ready standby l
(Refer to E.I. No. 505B10)
LPST Cooling System Ready standby
.III.
Precautions
- 1. - Two main coolant-system loops must be cut in at all times to the reactor l
vessel or the shutdown cooling system must be in operation when the reactor is shut down.
2.
The shutdown cooling system must be valved off and locked,. completely l
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50hA1:3 9
4 isolating the system before the main coolant system pressure ex-ceeds 300 psig.
3.
Tne main coolant system pressure must not exceed 500 psig until the temperature of the main coolant is at least 90oF.
Pressures in excess of this at low temperatures may be injurious to the reactor vessel.
h.
The main coolant system heatup rate must not exceed 500F/hr. As the normal operating temperature is, approached in the system, tha charging and bleed rate should be adjusted so as to normally main-tain a temperatum of the main coolant bleed downstream of the re-4 generative heat exchanger to less than an indicated temperature of 2h00F.
5 In order to protect the main coolant pump stator cans from damage due to negative pressure loadings while shut down, the pressures acti g on the pump must be controlled as follows:
a.
When the loops are isolated from the reactor vessel, the pressure in those loops must be maintained in the minimum range of 50 to 200 psi gage by periodic manual operation of the charging pumps.
N0E: Tnis does not apply to loops which are vented or open to atmosphere.
b.
During startup of the plant, the pressure in the reactor vessel and non-isolated loops is initially maintained by the pressurizer water level and atmospheric pressure acting through the open pressurizer vent. When the water in the pressurizer attains a temperature of 2200F, the system pressure is main-tained and controlled by the pressurizer steam conditions.
c.
Pressurizer steam temperature must comply with the requirements on curve P-MC-1 in the data reference bock.
6.
The pressurizer should not be hea'ed at a rate exceeding 200 F/hr.
0 7.
If the prassurizer NR low level alarm sounds, check to see that pressurizer heaters have been shut off automatically.
8.
If main coolant pump lower bearing temperatures exceed 2000F, the affected pump should be shut down and the malfunction investigated.
9.
No steam withdrawal from the secondary system is allowed until the nain coolant system has attained a temperature level of h850F,
- 10. The suction and discharge valves of the " ready standby" chargira pu.ps must be open during normal plant operation.
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I 50hA1:h
- 11. Criticality should be anticipated any time when control rods are being withdrawn or when boron is being removed from the main coolant system.
- 12. During a reacter startup in which core reactivity or control rod worths are not reasonably firm, a plot of inverse multiplication rate (or count rate) versus rod position should be made.
- 13. Any plant changes which might produce a sudden lowering of reactor water temperature (of the order of 100F) nust be avoided while the reactor is critical or approaching criticality.
Ih. During normal approach to power level, a flux multiplication rate of 1 decade / minute or less is acceptable. Flux multiplication rates greater than 1 decade / minute should be avoided.
- 15. Ihring normal a' proach to criticality, control rod withdrawal should p
1 be stopped for 1 minute whenever the count rate is doubled.
IV.
Check Off Lists i
Prior to initiation of this 0.I. pre-startup check off lists P1, 50hE-A and 50hF-C must be completed.
V.
Instructions 1.
Start component cooling water flowing to the main coolant pumps, -
primary system sample cooler, and neutron shield tank. Refer to 0.I. No. 50hI, CoMPCNENT C00LIN3 SYSTEM.
4 2.
Place the low pressure surge tank high water level control, high pressure and high temperature alar.,s in service.
3.
Check that the purification system is prepared to receive borated water from the low pressure surge tank. All ion exchangers are l
isolated.
h.
Line up and operate the purification cooling and drain pumps as required for LPST cooling.
NOTE: For abnormally high heat removal requirements, use the low pressure surge tank cooling pump.
5.
0;en the motor operated valve in the bleed line between the main coolant piping and the regenerative heat exchanger.
6 Turn on an pressurizer heater groups.
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- 7. ' At a pressurizer tenperature of 1800F, close the pressurizer ver6
d 50hAl':5
. valve, open the hot leg nain coolant loop 20" gate valve in loops which are to be placed in service. Open all of the loop bypass valves which are closed in loops which are to be placed in service.
8.
Maintain main coolant pressure between 50 and 200 psig by intermittent bleed or feed as required.
9.
Vnen pressurizer temperature reaches 250 F, open the isolation and bleed orifice valves in the bleed line to the low pressure sur' tank in order to drain the pressurizer, thereby flashing hot wat,er to form a steam bubble. Close the bleed orifice valves when the water level drains to 120 inches above the bottom of the pressurizer.
HOE: Pressure control of the primary system is now accomplished by manually cycling of the pressurizer heaters after the steam bubble has been forped.
- 10. Check open the motor operated pressure relief isolation valve at a pressurizer temperature of 2500F. Switch the solenoid relief valve control to " Auto" position.
- 11. If the-rod breakers are closed for the heatup, check that group 6 control rods are in the safety group position and that all other control rod groups are withdrawn 3 inches to provide for differential expansion.
12.
Start main coolant pumps when the indicated pressurizer steam temperature is 3900F by closing the switches on the main control' board. Run pumps for 2 minutes with cold leg valve closed and byptss valve open, then open cold leg and close bypass valve. Pump operation will result in heating up the main coolant system. Refer to curve P-MC-2 for anticipated heatup rate.
NOTE: Observe the indicated nain coolant flow in the individual loops. Vent the main coolant pu=ps. Refer to 0.I. No.
50hD1 - MAIN COOLANT - FILLIIG AND VENTIID COMPLETE SYSTEM.
- 13. Maintain pressurizer water level between 100 and 120 inches above the bottom of the pressurizer by manual intermittent operation of the bleed valves or at 120 + 5 inches by automatic level control.
0 Ih. Prior to attaining an indicated steam temperature of h10 F in the pressurizer (300 psig in the main coolant system), stop the shutdown cooling sp tem if operating, and isolate it from the main coolant system.
- 15. After approximately 5 minutes of coolant circulation with all main coolant pumps operating, sample the coolant to determine 02 and H BO.
3
- 16.. Add Hydrazine to the main coolant system as required. Refer to 0.I.
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b 50hA1:6 No. 50hJ2 - PRIMARY PLANT CORROSION CONTROL SYSTE.
0
- 17. Prior to obtaining a main coolant temperature of 200 F, perform final ventirg operation on the main coolant pumps, control rod mechanisms, instrunentation, etc. Refer to 0.I.~ No. 50hD1 - MAIN COOLANT SYSTEM -
FILLIN3 AND VENTIIG OF COMPLETE SYSTEM.
J
- 18. When the main coolant temperature reaches 2500F, shut down the main coolant pumps and maintain an essentially constant coolant temper-ature condition for a period of 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />. This will permit estab-lishing water-metal equilibrium temperature conditions in main I
coolant system components. During isothermal wait, the reactor may be taken critical at low power level, to aid in plant heat up or i
for special physics tests. Operate main coolant pumps as required to maintain the essentially constant main coolant temperature. Refer to 0.I. 50hD8 - MAIN COOLANT SYSTEM - Shutdown of Individual Loop,Section V, for the main coolant pump shutdown procedure.
- 19. Observe that appropriate rod position lights go on as the control rods are being withdrawn.
20 Durir(each control rod group withdrawal, observe neutron level
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instruments. Continue intermittent rod withdrawal until ciriticality is achieved.
Samals the pressurizer,s water circulation and decrease the pressurizer water and, as required,. operate the pressurizer 21.
surge spray to increas water boron content.
- 22. Start one low pressure surge tank make up punp, after associated i
valves f:em the primary water storage tank cr denineralized water storage tank have been opened.
- 23.. Open associated valves from the low pressure surge tank nake up pumps to the charging punp suction header.
NOTE: Since one LPST pump is a spare its discharge valve should be in the open position.
j 2h. Immediately close the motor operated valve between the LPST and the charging pump suction header.
NOTFa The feed and bleed operation should continue as outlined above.
- 25. When 0 concentration is less than.1 ppm, and system has been at
~2500F for at least two hours, start up the main coolant pumps and continue with the system heat up to 51h F.
'Use reactor heat as well as punp heat if desired.-
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- 26. Operate the pressurizer heater groups as required to comply with the operatirg conditions indicated on curvo P-MC-1 in the data reference book for safe operation of the main coolant pumps.
Pressurizer temperature should not exceed main coolant system tenperature by more than 200 F, unless necessary for nain coolant pump operation when the surge spray is operating.
- 27. When the plant has reached tho 5000F range and the integrity of the Primary Plant has been checket, initiate boric acid removal. Refer to 0.I. No. 50hG3 - Ch2MICAL SHUTDOWN CfSTEM - BORIC ACID REMOVAL.
- 28. For conpletion of the borated water removal through the purification syste=, open the notor operated valve between the LPST and the charging pump suction header.
- 29. Close the valve in the individual loop demineralized water fill line at the charging pump suction header and stop LPST make up pump.
30 When the boron concentration reaches 80 ppm, start chemical shut-down system operation by putting the chemical shutdown ion ex-changers in line. Refer to 0.I. No. 50hG3, CHEMICAL SHUTD0dN SYSTEM - BORIC ACID REM 07AL.
- 31. Place the purification ion exchangers into operation when boron concentration reaches 3 ppm or less. Refer to 0.I. No. 50hH, PURIFICATION SYSTEM.
NOTE: Additional main coolant purification may be accomplished by increasirg the flow to the ion exchargers and through the feed and bleed system.
- 32. Enen the r.ain coolant pmssure reaches 2000 psig, switch one pressur-icer heater group to cycling control and the other groups to 1cw pressure backup control.
- 33. Change the pressurizer wide range and KR water level channels pressure compensation to 2000 psig.
3h. Operate surge spray intermittently until the pressurizer water boron concentration corresponds to that of the main coolant water.
- 33. Switch the solenoid operated surge spray valve controls from "off" to " Automatic".
VI.
Final Condition The 41n coolant system is at temperature of 51h F, and a pressure of 2W sig.
e The reactor is critical f or low power tests, or is suberitical with the P-imary Plant in the hot standby condition.
.s 50hA2:1 OPE:tATIIG INSTRIICTION NO. 50hA2 FIA':T STARTUP AND SH:iTDOWN aIARTUP FROM HOT STAEBY CONDITION, SHUTDOWN TO THE HOT STANDBY CONDITION, AUD CFJdGIIU REACTOR IDAD.
I.
Objective To provide a safe and efficient method of:
a.
Starting up the reactor from the hot standby condition b.
Increasing reactor load c.
Decreasing reactor load and shutting down the plant to the hot standby condition.
II.
Conditions 1.
The Main Coolant System is at 2000 psig and 51h F, and the reactor is in power generation or hot standby operation.
2.
The normal feed and bleed rate has been established.
3.
The charging pump suction is from the low pressure surge tank.
h.
One group of pressurizer heaters is on cycling control, the remaining groups are on backup.
5.
Pressurizer surge spray and relief valve controls are set for auto-matic operation.
6.
A critical control rod position has been determined as firmly as possible based on all availableinformation and calculations.
7.
Boron conditions are as follows:
a.
During normal startups or low power physics testing boron concen-tration will be according to written procedures.
b.
If the boron concentration in the Main Coolant System is greater than 220 ppm, the plant shall not be operated above 5 Kdt.
c.
If the boron concentration in the Main Coolant System is greater that 80 ppm, the load on the plant shall not exceed 15 Nde.
8.
The. turbine generator is being prepared for operation according to 0.I. No~. 50hA5 - TURBINE GENERATOR STARTUP FROM HOT CONDITION, or is operating at some reduced load.
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L 50hA2:2 3
9.
Pertinent auxiliary systems are in the following conditions System Status Chmical Shutdown System Normal Standby or-
)
(Rt fer to 0.I. No. 50hG)
Nomal Operation Pur.fication System Normal Operation or
-(Refar to 0.I. No. 50kN)
Hot Standby Component Cooling System Normal Operation i
(Refer to 0 I. ib 50hI) l Primary Plant Corrosion Control System, Normal Standby (Refer.to 0.I. No. 50hJ)
Primary Plant Sampling ystem Normal Standby (Refer to 0.I-No. 50hK i
Reactor C6ntrol System Nomal Operation or (Refer to 0.I. No. 50hN)
Manual Control Nuclear Instrumentation System Nomal Operation (Refer to 0.I. No. 50ho)
Radiation Monitoring System Normal Operation 4
(Refer to 0.I. No. 50hP)
Vapor Container Atmosphere Control Systems Nomal Operation (Refer-to 0.I. No. 50hQ) j Electrical System Normal Operation (Refer to 0.I. No. 50hR)
Safety Injection System Ready Standby (Refer to E.I. No. 505B10)
III. Precautions
- 1.. Criticality should be anticipated when control rods are being with-drawn or when boron is being removed frce the main coolant system.
2.
During a reactor startup in Wich core reactivity or control rod worths are not reasonably fim, a plot of inverse multiplication rate (or counting rate) versus rod position should be made.
3.
Any plant changes which produce a sudden lowering of reactor water temperature (of the order of 100F) must be avoided while the reactor is critical or approaching criticality.
l
50hA2:3 h.
Durirg a normal approach to power level, a flux multiplication rate of 1 decade / minute or less is acceptable. Flux multiplication rates greater than 1 decade / minute should be avoided. Refer to 0.I. No.
50hN - REACTOR CONTROL SYSTEM.
- 5. During a normal approach to criticality, rod with'rawal should stop d
whenever the count rate is doubled.
6.
A proper plant water balance shoul,d be established in the water storage and waste collection tanks to ensure that adequate make up water is available and to receive water rejected from the primary plant.
7.
Power level charges in excess of 10% of full power per minute must be avoided.
8.
Enenever there is a sustained otutage of one of the 115 KV lines because of maintenance or fault condition, the three 2,h00 V buses will be tied together through the normally open circuit breakers to provide electrical power supply to both safety injection pumps.
IV.
Instractions A.
Taking the Reactor Critical and Phasirg the Turbine 1.
Prestartup check off list P-2 Reactor and Turbine Startup from a Hot Condition has been completed.
2.
Establish a firm critical rod position or start an inverse nultiplication plot.
3 Commence an intermittent prograr:med rod withdrawal.
NOTE: Cease rod motion for at least one minute for successive count rate doubling increments, h.
Anticipate criticality whenever control rods are being with-drawn.
5.
Continue programmed rod withdrawal following the steps out-lined in the operational check off list P-2.
6.
Wnen reactor is critical, establish vacuum and prepare to roll and phase the turbine following the detailed steps outlined in the operational check off list P-2.
B.
Increasirg Reactor Load 1.
As the load demand on the plant increased, increase the reactor power level using control rods if required. The reactor control i
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50hA2:h may be placed on "AUT0" if the plant power level is equal to or
-greater than 10% of full power. For power levels less than 10% " MANUAL" control must be used. Refer to 0.I. No. 50hN, REACTOR CONTROL SYSTD!.
2.
Observe the neutron flux level instruments as the station load increases. Refer to Che.ck off List No. 50ho-Al,Section III, NUCLEAR INSTRUMENTATION SYSTEM.
3.
After establishing the required reactor load, the reactor control may be placed on automatic T control; continue to observe nuclear panel instrumentation.g av NOTE: After attaining the required reactor power level, the reactor control system, when in "AUT0" control, will automatically compensate for reactivity changes due to fueldepletionand/orXenonlevelchanges,andstation load will be automatically maintained.
C.
Decreasing Reactor Load 1.
As'the'lohd on the plant decreases, decrease the reactor power level using~ control. rods as required. The reactor control may be placed on "AUT0" if the plant power level is equal to or greater than 10% of full powdr. For power levels less than 10%, " MANUAL" control must be used. Refer to 0.I. No. 50hN, REACTOR CONTROL SYSTEM.
2.
Observe the neutron flux level instruments as the station load decreases. Refer to Check off List No. 50ho-A1,Section III, NUCLEAR INSTRUMENTATION SYSTD1; 3.
Check that the turbine permissive relay tripout interlock indicating light goes out when the turbine generator load is reduced to approximately 15,000 m.
h.
When it is required to reduce the reactor power level to a critical-zero power level'or equivalent condition, shut down the turbine, refer' to 0.I. No. 50hc3, SCHEDULED TURBINE GENHLATOR SHUTDOWN.' Maintain T at 51h F with turbine steam bypass avg controller to bypass steam to condenser, 5.
To place reactor in the hot standby condition, insert rods to the all in position, with the exception of the safety group which will be left in the safety position.
D.
Charging and' Volume Contrcl Operation During Above Operating Conditions l.
During nor al feed and bleed operation, the following operating
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50hA2:5 l
limits and conditions should be maintained and periodically checked:-
a.
Low pressure surge tank ~ temperature and pressure -
Between 120 and 130 F and 15 psi gage (pressure re-0 quired to maintain desired hydrogen concentration in 7
the main coolant).respectively.
b.
Feed and. bleed flows - 25 gpm.
'f 2.
If the flow from the purification cooling and drain pu=ps is insufficient to maintain the water temperature in the low 0
pressure drain tank at 120 F, the low pressure surge tank cooling pump should be put into operation.
)
. NOTE: This high temperature condition may be due to the following conditions:
i Increased feed and bleed flow-Higher bleed than feed flow Pressurizer relief or safety valve effluent-into the low pressure surge tank.
t E.
Pressurizer and Relief System During Above Operating Conditions
(
1.
When pressurizer automatic level control is shut down, maintain pressurizer water level between 115 and 125_in. (above the bottom of the vessel) by manual control of the charging and vol;me control system.
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2.
Maintain-heater cycling duty on one specific heater bundle in order to fully expend all heaters in that heater bundle and to reduce the - possibility of more than one bundle failing durf ng any operating period.
If one heater element burns out, swir.ch i
the cycling duty to the other heater group in the same heater bundle.
3 Check pressurizer safety and relief valve discharge pipe temper-atures periodically to determine if the valves are leaking. Refer to E.I. No. 505B1h, FRERRY PIANT - MALFUNCTION OF PRESSURE RELIEF
' AND SAFETY VALVES.
I
- h. Checs pressurizer heater cycling and compare the heat load with the masured insulation heat losses, or check pressurizer surge pipe temperatum periodically to deternine if the circulation spray-is operating satisfactorily. If the surge pipe temperature.
drops below 530 F, _operat( the surge spray periodically as
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i 50hA2:6 required to induce a flow in the surge pipe and maintain the surge pipe temperature at or above 530 F.
Clean or repair the circulation sprey valve during the next shutdown period.
5.
If automatic pressure control of pressurizer heaters is not
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operating, manually control one pressurizer heater group to maintain main coolant system pressure at 2,000 psi gage.
1 6.
Sample the pressurize: water periodically to determine the degree of impurity buildup. If necessary, operate the pressurizer surge spray and heaters intermittently to increase the water flow through the pressurizer. Refer to 0.I. No. 50hK2, PRIMARY PIJJT SAMPLIN3 SYSTEM - AUXILIARY SYSTEMS.
V.
Final Conditions 1.
The reactor is critical at zero power.
2.
The nuclear steam generators are in operation at the required power level.
3.
The reactor is in the hot standby condition.
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$0hC2:1 1
0FERATIN3 INSTRUCTIONS 50hC2 PLA'iT SHUTDCfdN REACTOR AND PRIMARY PLANT C00LDOT!
I.
Objective To provide a safe and efficient method of cooling down and depressurizing the primary plant from the hot standby condition.
II. Conditions 1.
The primary plant is in the hot standby condition.
2.
Reactor decay heat is being dissipated by steam bypass to the condenser.
3.
The pressurizer water level, pressure, and temperature are at normal operating conditions, and heater, spray and pressure relief controls set for automatic operation.
h.
The pressurizer water level indicators are set for 2000 psig pressure compensation.
3.
Pertinent auxiliary systems are in the following status:
System Status Chemical Shutdown System Boric acid mixing and storage (Refer to 0.I. No. 50h3) tank is filled; boric acid solution is ready for addition to the main coolant system.
Purification System Normal Operation (Rafer to 0.I. No. 50hN)
Component Cooling System Normal Operation (Refer to 0.I. No. 50hl)
Primary Plant Corrosion-Normal Operation Control-System
.(Refer to 0.I. No. 50hJ)
Primary Plant Sarpling System Normal Operation (Refer to 0.I. No. 50hK)
Shutdown Cooling System Normal Operation (Refer to 0.I. No. 50hM) l V. C.~ Atmospheric Control Systems Normal operation
{
.(Refer to 0.I. No. 50hQ)
Safety Injection System Ready Standby
-(Refer to E.I. No. 505310) 3 1
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50hC2:2 III. Precautions 1.
Pressurizer water temperature must comply with the requirements indicated on curve P-MC-1 pressurizer temperature versus main coolant temperature located in the data reference book.
2.
The shutdown cooling system must'not be place'd in operation until, the main coolant pressure has reached 300 psig.
3.
The safety control rod group must be withdrawn to the safety position or the reactor held critical, until the main coolant system has reached essentially ambient temperature.
i h.
Routine checks of neutrcn level instruments should be made during the i
cooldown period.
5.
The primary plant cooldown rate must not exceed 500 per hour.
6 Maintain at least two main coolant loops tied into the reactor vessel (pain coolant p'mps may be off), or the shutdown cooling system in operation at all times when fuel is in the reactor.
7.
Do not shut off component cooling water to the main coolant pumps when the punps are shut down until main coolant temperature reaches 2000F.
IV. Check Off Lists Check off List Reactor Shutdown P3 and pre-cooldown check off list Ph have been completed. Operational check off list Ph is being completed es the Primary Plant cooldown progresses.
V.
Instructions CASE I.
PRIMARY PLANT C00LDOW'N FOR REACTOR P2FUELIN3 1.
Borate the main coolant system while at 51hoF to the full shutdown boron concentration (1150 ppm).
NOTE:
The boron centration may be varied to meet the requirements of spacial physics tests during the cooldown period.
2.
Operate purification at full capacity on cation resin or bleed and feed until the main coolant crud level is reduced to '.ess than 2
. ppm and the rate of crud removal.has slowed noticeably, and the main coolant specific activity is less than.58;2e/cc.
3.
Follow the steps outlined in Case II, omitting steps 2 and 12.
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L 50hC2:3 CASE II FRIMARY PLANT C00LDOWN FOR MAINTENANCE OF FRIMARY PLANT PP.ESSURIZED EQUIPMENT 1.
If a. main coolant loop has been previously isolated, check to assure that it contains water equal to or greater than the proper shutdown boron concentration.
If concentra. tion is below the proper level, establish the proper concentration by addition of 12% boric acid solution to the isolated loop.
2.
Initiate primary plant cooldown by shutting down the main coolant system. Borate to shutdown concentration (1150 ppm).
NOTE: When main coolant pressure reaches 1000 psig place safety injection system on manual control.
3.
Leaving one main coolant pump in operation, shut down all remaininE coolant pumps.
b By operation of the secondary plant anviliary systems and bypassing
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steam to the condenser reduce main coolant temperature.
5.
Maintain pressurizer level by use of charging pumps taking suction frcm the safety. injection shield tank cavity water storage tank con-taining 1.0% boric a~cid solution, as main coolant 2ter contracts c.ue to temperature reduction.
6.
Turn off all pressurizer heaters.
7.
Switch solenoid operated spray and relief contro2s from automatic to 0FF.
8.
Decrease pressurizer temperature and pressure by manual control of the pressurizer surge spray valve during main coolent system coolirg when one or more main coolant pumps are -operating. Pressurizer water terperature must comply with the operating conditions indicated on curve P-MC-1 in the data reference book for safe operation of the main coolant pumps.
CAUTION: The pressurizer must not be cooled at a rate exceeding 2000F per hour.
UOTE:
Cooling of the pressurizer free normal operating conditions' to 385-h100F should be acco=plished only by spray induced by main coolant pump operation, rather than by spray induced by I
charging pump flow through the auxiliary spray line, in order to reduce the thermal stresses impor.sd on the pressurizer f
l spray line connection. Main coolant pumps Nos. 1 or 2 will provide the maximum spray flow during one pump operation.
Running additional pumps will increase the spray flow if more j
l flow is required.
1
50hC2th 9.
Maintain normal pressurizer water level by manual or automatic control of a charging pump.
- 10. Shutdown remaining main coolant pump just prior to placing the shutdown coolirg system in operation.
- 11. hten main coolant system reaches 330 F and 300 psig, place shutdown cooling system in operation.
- 12. Sample main coolant system to determine boron concentration.
- 13. Insert all rods to the full in position with the exception of Group 6 which will be maintained at the safety position.
Ih. After all main coolant pumps are shutdown, further pressurizer temper-ature and pressure reduction ~1s performed by charging pump flow through the auxiliary spray line to the pressurizer spray, or by raising and lowering the pressurizer level by using maximum feed and bleed.
Pressurizer water temperature should be maintained 200F greater than main coolant, temperature measured by the shutdown cooling system inlet temperature detector until main coolant temperature reaches approxir_.tely 200 F.
NOTE: hten initiating auxiliary spray to the pressurizer, a variable speed charging pump, set for minimum flow, should be ured to decrease the thermal shock on the pressurizer vessel spray connection. If possible, a bleed flow should be initiated to p:eheat the spray water. Do not use more than the capacity of one charging pump for the auxiliary spray flow.
15 Change the pressurizer wide rarge and narrow range water level pressure compensation to the minimm value.
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- 16. hten the main coolant system temperature reaches 200 F, increase charging rate to the main coolant system in order to fill the pressurizer, and vent the pressurizer steam and gas volume through the solenoid relief valve to the low pressure surge tank.
- 17. kten the pressurizer water level reaches the upper limit of the vide range level detector operate one charging pump at full flow for 3 minutes.to assure water has reached the motor operated relief isolation valve.
- 18. Remove the blind flanges from the pressurizer vent valve discharge line and the 3/h" vent line to the vent header.
- 19. Connect plastic hose to the uncovered flanges.
- 20. Check that the primary vent stack is discharging dilution air and that the stack monitors are on.
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- 21. Line up the vent header to discharge to the primary vent stack in-stead of the primary drain collecting tank.
- 22. Line up the pressurizer vent line to discharge via the plastic hose to the vent header.
- 23. Close the motor operated relief isolation valve.
2h. -De-energize the solenoid operated relief valve.
- 25. When the main coolant temperature approaches lho F, shut off the com-ponent cooling water to all main coolant pumps.
- 26. If maintenance is to be limited to loops only, then isolate only those loops required, by closing their motor operated stop valves after main coolant temperature has been reduced to approximately 1h00F.
- 27. If maintenance requiring pressurizer draining is to be accomplished isolate all four loops prior to drMMng the pressurizer.
- 28. Maintain the isolated loops at a pressure of 50 psig by intermittent use of a charging pump through the loop fill lines.
- 29. The shutdown cooling system is continued in ope. ration maintaining main coolant temperature below lh00F.
- 30. If vapor container gross air borne activity is greater than 3 x 10-9
):c/ce, start activity dilution operation.
- 31. Check meteorological conditions to ascertain whether or not purging of the vapor container is permissible.
Start the vapor container air purgirg operating at full capacitg /cc) 32.
(15,000 cfm),'when an rir-borne radioactivity level of (3 x 10 91c or less is reached.
UCTE: The vapor container air purging operation should be continued during reactor shutdown, giving one complete air change per hour.
- 33. If reactor vessel head removal is anticipatad; sample the main coolant system for assurance that coolant activity level has not, increased beyond allowable lirit. Refer to 0.I. No. 50hn, PP.IMARY PLANT SAMPLINT SYSTEM - MAIN COOLANT SYSTM.
VI. Final Condition The primary plant is cooled down and depressurized.
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