ML20138K303
| ML20138K303 | |
| Person / Time | |
|---|---|
| Site: | Point Beach  |
| Issue date: | 01/31/1997 |
| From: | WISCONSIN ELECTRIC POWER CO. |
| To: | |
| Shared Package | |
| ML20138K159 | List:
|
| References | |
| NUDOCS 9702180145 | |
| Download: ML20138K303 (31) | |
Text
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NUCLEAR POWER BUSINESS UNIT OP 4D PART 5 OPERATING PROCEDURES MAJOR IPTE DRAINING THE REACTOR COOLANT SYSTEM TO Revision 1 -
A CVCS HUT WITHOUT ENTERING REDUCED January 31,1997 O
INVENTORY AND WITHOUT DRAINING STEAM GENERATOR TUBES Unit RECORD Date PROCEDURE VERFIED CURRENT AND CHECKED FOR TEMPORARY CHANGES IF FIELD COPIES REQUIRED, USE PBF4J0261AW NP !J 4 AND DO ERI COMPLETE TEC5 BLOCK BY:
DATE:
DISCUSSION This procedure provides the direction for draining the RCS without entering reduced inventory and without draining steam generator tubes. Ifit is necessary to enter reduced inventory, OP-4D Part 2 should be used.
This procedure details the required action to drain the RCS from a solid depressurized condition to a partially drained condition (>55% RV level). In this procedure, reactor coolant is pumped via the RHR system and the letdown divert portion of the CVCS to a CVCS HUT. A nitrogen backfill of the RCS is employed to fill the vdded areas in the RCS eliminating 0 contact. This section is in concert with, and a 2
sequel to, OP-3C.
l Q
A. DRAINING THE RCS TO A CVCS HUT
- V 1.0 PURPOSE 1
This procedure provides operator guidance in:
j 1.1 Draining the RCS via the RHR and letdown divert system to a CVCS HUT
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1.2 Nitrogen backfilling of the RCS to maintain a slightly positive pressure in the RCS.
1.3 Preparing the RCS for a containment integrated leak rate test.
4 1.4 Inventorying the amount of reactor coolant drained at a check on reactor vessel water levelindication.
4 1.5 Purging and isolating the RCDT from the vent header and the gas analyzer.
t 1.6 Aligning the letdown, purification, and charging system from RHR for a drained down operating mode with S/G tubes not drained.
2.0 REFERENCES
IR 96-006, NRC Inspection Report; NRC Commitment for Operations procedures PMT/QC reviews.
9702180145 970210 m Page1of31 REFERENCE USE PDR ADOCK 0500030E P
PDRgj
-9,
NUCLEAR POWER BUSINESS UNIT OP 4D PART 5 OPERATING PROCEDURES MAJOR IPTE DRAINING THE REACTOR COOLANT SYSTEM TO Revision 1 A CVCS HUT WITHOUT ENTERING REDUCED January 31,1997 INVENTORY AND WITHOUT DRAIh7NG STEAM GENERATOR TUBES 3.0 PRECAUTIONS AND LIMITATIONS i
NOTE:
Asterisk (*) indicates a TechnicalSpecification requirement.
- 3. l
may be temporarily out of service for surveillance requirements.
NOTE:
The RCS is open to the atmosphere when any one ofthefollomng conditionsis satisfied:
- a. At least oneprimary manway is removed
- b. One PORVis maintained open.
c.
The reactor vesselheadis unholted d Onepressurizersafety valve is removed 3.2
- When the RCS is <360*F and not open to the atmosphere, the LTOP system must be operable and enabled.
3.3
- When the RCS is not open to the atmosphere and either cold leg temperature is s275"F, no more than one high head SI pump shall be operable. The inoperable pump shall have its associated 4160 volt breaker racked out or its discharge valve shut and operator pow removed.
3.4 Observe the applicable Health Physics procedures for handling radioactive liquids and fo venting vapors and gases. Special precautions are required when the VNPSE system not operating as in the preparation of the RCS for a containment ILRT by purging the PRT to a lower acceptable level ofH and radgas concentration.
2 3.5 Reactor vessel level must be maintained 23/4 pipe corresponding to 222% on LI-447/LI-447A to ensure reliable operation of the RHR system. Reactor vessel level s29% may allow SG tubes to burp.
3.6 This procedure does not govern the placing of a unit in a reduced inventory cond
~
3.7 Reactor vessellevelinstruments, LT-447/LT-447A, are pressure sensitive. Ensure each transmitter is thoroughly purged ofliquid in the reference leg and air in the va leg prior to placing it in service.
Page 2 of 31 REFERENCE USE e
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I NUCLEAR POWER BUSINESS UNIT OP 4D PART 5 OPERATING PROCEDURES MAJOR IPTE DRAINING THE REACTOR COOLANT SYSTEM TO Revision 1 A CVCS HUT WITHOUT ENTERING REDUCED January 31,1997 INVENTORY AND WITHOUT DRAINING STEAM GENERATOR TUBES 3.8 When the local level indicator, LI-447B, is used to indicate reactor vessel level, the RCS must be depressurized to containment atmospheric pressure to obtain an accurate level indication. Iflevelis below 55%, sealinjection must be secured to the B RCP-Unit 1 (A i
RCP-Unit 2).
{
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3.9 The RVLIS must not be used for definitive reactor vessel level indication. It should be used to verify level trends en the associated recorder especially when level is in the blind spot from off scale low on pressurizer level to on scale high on LI-447/LI-447A.
3.10 Implement OP-4F prior to commencing the draining of the reactor coolant system (except for verification of single train decay heat removal which is contained within the body of this procedure). OP-4F is required to be in effect prior to draining the RCS to <55% as indicated on LI-447/447A This level is ~3' below the reactor vessel flange.
3.11 Prior to opening or allowing maintenance on the RCS, verify single train RHR decay heat removal capability to maintain the RCS at s the desired temp at s the specified RHR flow rate. When performing the demonstration, CCW flow shall be established through only one RHR heat exchanger. The CCW flow rate through the RHR heat exchanger selected may be increased to the design flow rate (per local plaque) and the service water flow through the CCW heat exchanger (s) should be set at ~4 psid.
3.11.1 For a refueling shutdown, demonstrate the ability of one train ofRHR to j
maintain the RCS at sl40 F at sl500 gpm RHR flow.
i 3.11.2 For a cold shutdown, demonstrate the ability of one train of RHR to maintain 4
the RCS at $160 F at sl500 gpm RHR flow.
3.12 If, during the performance of this procedure RHR cooling becomes impaired or lost, reduce RHR flow to 1000 gpm 2100 gpm, secure draining and proceed to SEP-1 degraded RHR system capability.
INITIALS 4.0 INITIAL CONDfrIONS 4.1 The RCS boron concentration is 2 required (for refueling shutdowns 22100 ppm).
1 l
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. REFERENCE USE j
NUCLEAR POWER BUSINESS UNIT OP 4D PART 5 OPERATING PROCEDURES MAJOR IPTE DRAINING THE REACTOR COOLANT SYSTEM TO Revision 1 A CVCS HUT WITHOUT ENTERING REDUCED January 31,1997 INVENTORY AND WITHOUT DRAINING STEAM GENERATOR TUBES INITIALS 4.2 The RCS is solid and depressurized.
4.3 The reactor has been shutdown for >65 hours or the decay heat load has been demonstrated to be within the heat removal capability of a single train ofRHR to maintain the unit at cold shutdown (<200'F). For demonstrating single train capability, RHR flow should be sl500 gpm and CCW flow through only one RHR HX.
4.4 RCS temperature is being maintained:
For a cold shutdown sl60*F, or For a refueling shutdown <140 F, or For a containment ILPT 100-110 F 4.5 1 Train of RHR is in operation and with flow set at 1500 gpm t 100.
O 4.6 The letdown gas stripperis offline.
4.7 Letdown alignment is in the degas mode bypassing the VCT inlet.
i 4.8 The equivalent of one empty CVCS HUT is available to store the reactor coolant.
4.9 An equivalent of lH GDTs gas storage space is available.
)
4.10 The waste gas system is operable.
4.11 The nitrogen supply system is available.
4.12 The containment purge supply and exhaust system is operating, except when a containment ILRT is planned.
4.13 i
A one-inch hose is installed between the PRT at RC-590 and the purge exhaust fan suction as in Figure 1. (Figure I A) 4.14 Isotopic chemical analysis of the RCS indicates that the concentration of radioisotopes is within an acceptable level for draindown.
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NUCLEAR POWER BUSINESS UNIT OP 4D PART 5 t
OPERATING PROCEDURES MAJOR IPTE DRAINING THE REACTOR COOLANT SYSTEM TO Revision 1 A CVCS HUT WITHOUT ENTERING REDUCED January 31,1997 INVENTORY AND WITHOUT DRAINING STEAM 1
GENERATOR TUBES INITIALS 4.15 The PRT gas space is:
1 4.15.1 s10% H2 for a normal RCS draindown.
OR l
4.15.2 s4% H and six10E"3pc/cc Xe-133 for draindown prior to an 4
2 ILRT.
4.16 Any restrictions on the number of operable charging pumps per REI 19.0 is met.
NOTE:
As a good operatingpractice, OP4Fis to be implementedprior to commencing draindown. OP4Fis required to be implementedprior to entering reducedinventory.
4.17 Implement OP-4F, " Reactor Coolant System Reduced Inventory Requirements" except for single train decay heat removal capability at 1500 gpm which will be performed in this procedure.
4 5.0 PROCEDURE 51 Verify pressurizer spray valves, RC-431 A&B, are open 4
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Page 5 of 31 REFERENCE USE.
NUCLEAR POWER BUSINESS UNIT OP 4D PART 5 OPERATING PROCEDURES MAJOR IPTE DRAINING THE REACTOR COOLANT SYSTEM TO Revision 1 A CVCS HUT WITHOUT ENTERING REDUCED January 31,1997 INVENTORY AND WITHOUT DRAINING STEAM GENERATOR TUBES INITIALS NOTE 1: El. 66'for Unit 1; Pressurizer compartmentfor Unit 2.
NOTE 2: N/A when ILRTisplanned. Leave valve open.
NOTE 3: Valveis normallylockedshut.
5.2 Position the following:
RC-545C A SG cold leg vent to PRT Danger Tagged Shut RC-546C B SG hot leg vent to PRT Danger Tagged Shut RC-547C A SG hot leg vent to PRT Danger Tagged Shut RC-548C B SG cold leg vent to PRT Danger Tagged Shut RC-526A A SG channel head drain Danger Tagged Shut RC-526B B SG chmnel head drain Danger Tagged Shut RC-545A A sa cold leg vent isolation Danger Tagged Shut 1
RC-547A A SG hot leg vent isolation Danger Tagged Shut RC-546A B SG hot leg vent isolation Danger Tagged Shut gl RC-548A B SG cold leg vent isolation Danger Tagged Shut W
RC-571 Reactor head vent orifice bypass Open RC-572 Reactor head vent orifice bypass Open RC-576 Pressurizer vent orifice bypass (Note 1) Open RC-577 Pressurizer vent orifice bypass (Note 1) Open RC-575C Manualisolation ofRC-575B (Note 2) Shut RC-584 Gas vent to low pressure fill & vent (Note 3) Open i
RC-583 Gas Vent to PRT relief header isolation Shut RC-585 Low pressure fill and vent PRT isolation-Open i
RC-595 Nitrogen to PRT isolation Open RC-441(PCV)
PRT nitrogen regulator 3-4 psi MOB No. 372 (482) RC-570A DC Breaker in 1C-20 (2C-20)
Close MOB No. 374 (484) RC-580A DC Breaker in 1C-20 (2C-20)
Close MOB No. 376 (486) RC-575A DC Breaker in 1C-20 (2C-20)
Close MOB No. 387 (497) RC-570B DC Breaker in 1C-20 (2C-20)
Close MOB No. 389 (499) RC-580B DC Breaker in 1C-20 (2C-20)
Close MOB No. 391 (501) RC-575B DC Breaker in IC-20 (2C-20)
Close 5.2.1 Verify RC-589 shut.
Shut Then shut RC-532.
Shut.
Page 6 of 31 REFERENCE USE
NUCLEAR POWER BUSINESS UNIT OP 4D PART 5 OPERATING PROCEDURES MAJOR IPTE DRAINING THE REACTOR COOLANT SYSTEM TO Revision 1 A CVCS HUT WITHOUT ENTERING REDUCED January 31,1997 INVENTORY AND WITHOUT DRAINING STEAM GENERATOR TUBES INITIALS 5.2.2 Verify the PRT N supply line is free ofliquid by:
2
- a. Drain at RC-1420A, the low point drain down stream of RC-528.
- b. When line is dry and N flow is verified, shut and cap 2
RC-1420A.
5.2.3 Open RC-532, N supply to PRT.
Open 2
5.2.4 Shut and danger tag the PRT to gas analyzer isolation valves:
RC-538 Danger Tag Shut RC-539 Danger Tag Shut i
5.2.5 Rack out and danger tag all pressurizer heater breakers.
5.3 Align letdown divert to the dedred HUT Record: T8A, B, or C level at (Circle one) 1 5.4 Verify CV-112A, letdown divert valve, control switch in " AUTO."
NOTE:
PI-493 willindicate a 275" reference leg water column ~10psig when the RCS is at atmosphericpressure.
aCAUTION*
AN INDICATION OF <IO PSIG ON PI-493 IS AN
)
INDICATION OF A VACUUM IN THE RCS. VERIFY N2 BACKFILL ALIGNMENT OR DECREASE THE DRAIN RATE. A NEGATIVE RCS PRESSURE WILL DISTORT THE CALIBRATION OF PRESSURIZER LEVEL INSTRUMENTATION.
5.5 Adjust letdown and/or charging flow until RCS pressure on PI-493 is 10-13 psig.
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NUCLEAR POWER BUSINESS UNIT OP 4D PART 5 OPERATING PROCEDURES MAJOR 4
IPTE DRAINING THE REACTOR COOLANT SYSTEM TO Revision 1 A CVCS HUT WITHOUT ENTERING REDUCED January 31,1997 g
INVENTORY AND WITHOUT DRAINING STEAM W
GENERATOR TUBES INITIALS 5.6 Open RCGVS valves to establish N backfill path.
2 1
RC-580A RCGVS pressurizer SOV Open RC-580B RCGVS pressurizer SOV Open RC-575A RCGVS PRT SOV Open 5.7 To commence drain ofRCS:
5.7.1 Reduce charging to 1 pump at minimum speed.
5.7.2 Shut CV-142 to maintain normal RCP seal injection flow.
aCAUTIONa DO NOT EXCEED 40 GPM THROUGH THE CATION BED DEMINERALIZER. THROTTLE OPEN THE CATION BYPASS AS REQUIRED.
5.7.3 Adjust letdown flow to achieve desired drain rate by opening CV-135.
5.7.4 Verify CV-112A auto diverts as VCT level increases to the modulating level of-56%
NOTE:
Steps S.8 through S.11 are N/A unless a containment ILRTis scheduled at the beginning ofa refueling outage.
5.8 PZR Level for ILRT Secure RCS draindown when pressurizer level approaches 60% and stabilize level at 55-65% per LI-433, the pressurizer cold calibrated level indicator.
i 5.9 LTOP for ILRT 5.9.1 Mechanically block open RC-430 (or 431C) PORV.
5.9.2 Verify RC-516 (or 515), the associated PORV block valve for the blocked open PORV, is maintained open.
O' i
Page 8 of 31 REFERENCE USE
NUCLEAR POWER BUSINESS UNIT OP 4D PART 5 OPERATING PROCEDURES MAJOR IPTE DRAINING THE REACTOR COOLANT SYSTEM TO Revision 1 A CVCS HUT WITHOUT ENTERING REDUCED January 31,1997
/
INVENTORY AND WITHOUT DRAINING STEAM GENERATOR TUBES INITIALS 5.9.3 Install danger tags on the selected PORV and the selected PORV block valve control switches on C04.
i 5.10 Alignment of RCS. PRT and RCDT for an ILRT 5.10.1 Shut RC-595, PRT N2 supply isolation.
5.10.2 Fill the RCDT from the PRT to a level of 95% while venting the RCDT to the VH Adjust VH pressure to <2.0 psig.
5.10.3 Shut and danger tag:
4 WG-1786 Containment VH isolation Danger Tag Shut WG-1787 Containment VH isolation Danger Tag Shut
{
WG-1788 RCDT/GA isolation Danger Tag Shut WG-1789 RCDT/GA isolation Danger Tag Shut 5.10.4 Open RC-527, PRT to VH AOV, and slowly pump the RCDT to a level of s30% while observing a positive pressure in the PRT and RCDT during the pumpdown.
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NUCLEAR POWER BUSINESS UNIT OP 4D PART 5 OPERATING PROCEDURES MAJOR IPTE DRAINING THE REACTOR COOLANT SYSTEM TO Revision 1 A CVCS HUT WITHOUT ENTERING REDUCED January 31,1997 i
INVENTORY AND WITHOUT DRAINING STEAM GENERATOR TUBES INITIALS 5.10.5 Depressurize RCDT, PRT and pressurizer to containment pressure by opening:
i RC-586 Low pressure fill & vent PRT isolation Open RC-589 Low pressura fill & vent N supply Open 2
RC-590 Low pressu.. 'l & vent PRT exhaust Open 5.10.6 When the system is depressurized; a.
Shut RC-527 PRT to VH AOV Shut
- b. Then open WG-1609 RCDT local vent Open 5.10.7 Verify open RC-575C, RCGVS standpipe manual isolation, to pennit remote venting ofRCS during ILRT.
5.10.8 Continue with the preparation for the ILRT per ORT 9, then gl the ILRT per ORT 17.
5.11 Pfal-JLRT RCS. RCDT. and PRT Alienment to Resume Draindown 5.11.1 When N cylinders for RC-430 and 431C PORVs are 2
reconnected per ORT 10, then verify that the PORV N backup 2
system is aligned for LTOP service per CL-4C.
5.11.2 Verify the LTOP system is in service per the requirements of OP-3C. (Place the LTOP System in service.)
5.11.3 Remove the mechanical block open device on RC-430 (431C)
PORV installed in Step 5.9. (LTOP for ILRT)
PMT 5.11.4 Stroke RC-430(431C) to verify valve strokes without binding.
No timing is required since mechanically blocking valve should not affect operability.
5.11.5 Shut RC-575C, RCGVS standpipe manualisolation.
Shut Page 10 of 31 REFERENCE USE e
NUCLEAR POWER BUSINESS UNIT OP 4D PART 5 OPERATING PROCEDURES MAJOR IPTE DRAINING THE REACTOR COOLANT SYSTEM TO Revision 1 A CVCS HUT WITHOUT ENTERING REDUCED January 31,1997 O
TNVENTORY AND WITHOUT DRAINING STEAM GENERATOR TUBES INITIALS 5.11.6 Shut the following valves at the PRT:
RC-586 Low pressure fill & vent PRT isolation Shut RC-589 Low pressure fill & vent N2 supply Shut RC-590 Low pressure fill & vent PRT exhaust Shut 5.11.7 Verify open the following valves at the PRT:
RC-532 N supply to PRT Open 2
RC-585 Low pressure fill & vent PRT isolation Open RC-584 Gas vent to low pressure fill & vent Open 5.11.8 Reconnect the vent hose at RC-590.
5.!1.9 Reinstall the pressure gauge at RC-441 N regulator.
2 5.11.10 Open NG-1662, N supply to containment.
Open 2
5.11.11 Vent the RCDT to the PRT:
a.
Shut WG-1609 RCDT local vent.
Shut
Open i
5.11.12 To resume RCS draindown:
- a. Verify open:
l RC-575A RCGVS PRT SOV Open RC-580A RCGVS pressurizer SOV Open RC-580B RCGVS pressurizer SOV Open
- b. Adjust RC-441, PRT N regulator, for a delivery pressure 2
of 3-4 psig.
O Page11 of31 REFERENCE USE e
NUCLEAR POWER BUSINESS UNIT OP 4D PART 5 k
OPERATING PROCEDURES MAJOR IPTE DRAINING THE REACTOR COOLANT SYSTEM TO Revision 1 A CVCS HUT WITHOUT ENTERING REDUCED January 31,1997 INVENTORY AND WITHOUT DRAINING STEAM GENERATOR TUBES INITIALS Open RC-595 PRT N supply isolation.
Open c.
2
- d. When PRT and pressurizer indicate a N overpressure of 2
3-4 psig, reduce charging flow to minimum to maintain normal RCP seal injection flow with CV-142 and maximize letdown flow by opening CV-135 as in previous steps of this procedure.
5.12 Purce of VCT Gas Soace 5.12.1 Adjust CV-114, VCT N regulator, to ~30 psig.
2 5.12.2 Purge the VCT gas space to the VH by allowing the VCT level to rise to 90-95%, then lower the level while backfilling with N.
2 5.12.3 Return CV-112A, letdown divert valve, control switch to I
" AUTO" and verify that VCT level returns and controls at the auto divert setpoint of-56%.
5.12.4 Adjust CV-114, VCT N regulator to 20 psig 2
5.13 When pressurizer levelis <50% on LI-433A, ppgn the following valves to provide N backfill to the RV head:
2 RC-570A Open RC-570B Open 5.14 When the pressurizer level indication is ~5% on LI-433A, stop the draindown by reducing letdown flow to equal charging / seal injection flow.
5.15 Perform IT-700(705), " Inservice Test of RCGVS Valves," ifrequired.
5.16 Assign an SRO to oversee the remainder of the draindown operation until levelis stabilized @ the desired level (but not s55%). The draindown operation will be his primary responsibility.
g Page 12 of 31 REFERENCE USE
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NUCLEAR POWERBUSINESS UNIT OP 4D PART 5 OPERATING PROCEDURES MAJOR IPTE DRAINING THE REACTOR COOLANT SYSTEM TO Revision 1 i
i A CVCS HUT WITHOUT ENTERING REDUCED January 31,1997 i
INVENTORY AND WITHOUT DRAINING STEAM GENERATOR TUBES i
INITIALS 5.17 A senior line manager shall conduct a briefing for the Operations personnel involved in the draindown. It shall be given to each shift involved in the draindown until the draindown is complete and a stable level is achieved.
i 5.18 Place the reactor vessel level transmitters (LT-447/447A) in service as follows:
l 4
NOTE:
Narrow range RVLIS indication and recorder traces should be used to support the response ofRVlevelindicators, LI-447/LI-447A.
l NOTE:
Reference Figure 1for Unit 1 and Figure 1Afor Unit 2.
i NOTE:
Reference HP 2.5.2for venting / draining ofsystems in
}
contact with RCS b
NOTE:
RC-500B is not danger tagged open due to its location in the keynwy with limited access.
\\
NOTE:
RC-500N, RC-500P, RC-525C, and RC-525D are not danger tagged to allowfor operationalflexibility to vent / purge transmitter and/or I& C resting (as required).
4 1
5.18.1 AT C-20 Danger Tan Onen the following valves:
J RC-530A PZR ver.t isolation valve Danger Tag Open
}
RC-580B PZR vent isolation valve Danger Tag Open 4
RC-570A Rx vessel head vent Danger Tag Open RC-570B Rx vessel head vent Danger Tag Open 5.18.2 At C-04 shut the following Do Not Danoer Tar RC-597 RV flangeleakoff SOV Shut
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NUCLEAR POWER BUSINESS UNIT OP 4D PART 5 OPERATING PROCEDURES MAJOR IPTE DRAINING THE REACTOR COOLANT SYSTEM TO Revision 1 A CVCS HUT WITHOUT ENTERING REDUCED January 31,1997 g
INVENTORY AND WITHOUT DRAINING STEAM W
GENERATOR TUBES INITIALS 5.18.3 At 21' Containment shut the following Do Not Dancer Tag:
RC-522 RV flange leakoff to drain tank Shut RC-525C LT-447 variable IJg ivalation Shut RC-525D LT-447 referenceTeg isolation Shut RC-500N LT-447A variable leg isolation Shut RC-500P LT-447A reference leg isolation Shut 5.18.4 At 21' Containment Danger Tan Shut:
RC-525 Reactor vessel level cross-connect isolation Danger Tag Shut 5.18.5 At the PRT shut the following Do Not Danger Tag:
RC-587 LT-477 reference leg isolation to PRT Shut O
5.18.6 At the PZR shut the following Do Not Dancer Tag:
SC-950B PZR steam space sample Shut 5.18.7 At the PZR Danger Tan Onen the following:
RC-500Q LT-447A reference leg isolation Danger Tag Open SC-950 PZR steam space sample isolation
. Danger Tag Open RC-535 PZR to gas vent system isolation Danger Tag Open 5.18.8 At the 66' U1 (PZR U2) Danner Tae Open the following:
RC-576 PZR vent orifice bypass Danger Tag Open RC-577 PZR vent orifice bypass Danger Tag Open O
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i NUCLEAR POWER BUSINESS UNIT OP 4D PART 5 i
OPERATING PROCEDURES MAJOR IPTE DRAINING THE REACTOR COOLANT SYSTEM TO Revision 1 A CVCS HUT WITHOUT ENTERING REDUCED January 31,1997 7-INVENTORY AND WITHOUT DRAINING STEAM GENERATOR TUBES INITIALS 5.18.9 At the 66' Danner Tag Ooen the following:
RC-573 Reactor head vent isolation Danger Tag Open RC-572 Reactor head vent orifice bypass Danger Tag Open RC-571 Reactor head vent orifice bypass Danger Tag Open RC-587A LT-447 reference leg isolation Danger Tag Open RC-579 LT-447 reference leg isolation Danger Tag Open l
RC-578 PZR vent isolation Danger Tag Open 5.18.10 At the Reactor Head Danner Tau O.ps the following:
RC-500 Reactor head vent isolation Danger Tag Open i
i i
J i
1 0
Page 15 of 31 REFERENCE USE
NUCLEAR POWER BUSINESS UNIT OP 4D PART 5 OPERATING PROCEDURES MAJOR IPTE DRAINING THE REACTOR COOLANT SYSTEM TO Revision 1 A CVCS HUT WITHOUT ENTERING REDUCED January 31,1997 INVENTORY AND WITHOUT DRAINING STEAM GENERATOR TUBES INITIALS j
5.18.11 At the 8' Danner Tan Onen the following:
RC-500D Reactor vessellevel variable leg l
isolation Danger Tag Open RC-500J LT-447/447A variable leg isolation Danger Tag Open RC-500K LT-447/447A variable leg isolation Danger Tag Open 5.18.12 Place LT-447/447A in service as follows:
Drain LT-447 N side of all liquid via RC-525B and 2
Drained verify a positive outflow ofN2 Vent LT-447 liquid side of all gas via RC-525A and verify solid stream ofliquid.
Vented O
Verify LT-447 body vent and drain valves are shut.
Vent Shut Drain Shut Drain LT-447A N side of all liquid via RC-500M 2
Drained and verify a positive outflow of N2 Vent LT-447A liquid side of all gas via RC-500L and verify solid stream ofliquid.
Vented Verify LT-447A body vent and drain valves are shut.
Vent Shut Drain Shut RC-525D LT-447 reference leg isolation Open RC-525C LT-447 variable leg isolation Open 0
Page 16 of 31 REFERENCE USE 9
NUCLEAR POWER BUSINESS UNIT OP 4D PART 5 OPERATING PROCEDURES MAJOR IPTE DRAINING THE REACTOR COOLANT SYSTEM TO Revision 1 A CVCS HUT WITHOUT ENTERING REDUCED January 31,1997 INVENTORY AND WITHOUT DRAINING STEAM GENERATOR TUBES INITIALS NOTE:
Abruptly starting / stopping the venting / draining can adversely affect LT-447 calibration.
1 Complete the purge of LT-447 by carefully venting / draining the DP cell with the valves provided at the cell.
RC-500P LT-447A reference leg isolation Open RC-500N LT-447A variable leg isolation Open NOTE:
Abruptly starting / stopping the venting / draining can adversely affect LT-447A calibration.
Complete the purge of LT-447A by carefully venting / draining the DP cell with the valves provided at the cell.
I 5.18.13 Set the low level alarm setpoint for LC-447/447A @ 67%:
LC-447 @ 67%
LC-447A @ 67%
5.18.14 Set the high level alarm setpoint for LC-447/447A @ 100%:
LC-447 @ 100% '
I LC-447A @ 100%
5.18.15 Place the reactor vessel low level alarm bypass switch to ENABLE for LC-447/447A:
LC-447 Enable LC-447A Enable i
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NUCLEAR POWER BUSINESS UNIT OP 4D PART 5 OPERATING PROCEDURES MAJOR IPTE DRAINING THE REACTOR COOLANT SYSTEM TO Revision 1 A CVCS HUT WITHOUT ENTERING REDUCED January 31,1997 INVENTORY AND WITHOUT DRAINING STEAM g
w GENERATOR TUBES INITIALS NOTE:
Volume between pressurizer level off-scale low and RVLIS
\\
indicating a decreasing reactor vessellevelis approximately 1200 gallons.
NOTE:
Volume between pressurizer level off-scale low and refueling level instrument (L1-447/L1-447A) on-scale high is apprarimately 2000 Rallons.
aCAUTIONa DO NOT DRAIN MORE THAN 3000 GALLONS FROM THE TIME PRESSURIZER LEVEL IS OFF-SCALE
~
UNTIL LT-447/LT-447A IS ON-SCALE WITHOUT INVESTIGATING FOR THE DISCREPANCY.
~
aCAUTIONa IF DURING THE PERFORMANCE OF THIS EVOLUTION, RHR COOLING BECOMES IMPAIRED OR LOST, REDUCE RHR FLOW TO 1000 100 GPM, SECURE DRAINING AND PROCEED TO SEP-1,
" DEGRADED RHR SYSTEM CAPABILITY."
5.19 Drain the RCS from just on scale on the pressurizer level instruments to on scale on the reactor vessel level instruments per the following steps:
5.19.1 Record the level in the HUT lined up to receive letdown:
T8A,B,C (Circle One)
NOTE:
To maintain a constant charging and sealinjectionflow rate, 1 chargingpump operating at minimum speedis recommended 5.19.2 Establish the desired drainage rate by increasing letdown / reducing charging flow.
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NUCLEAR POWERBUSINESS UNIT OP 4D PART 5 OPERATING PROCEDURES MAJOR IPTE DRAINING THE REACTOR COOLANT SYSTEM TO Revision 1 A CVCS HUT WITHOUT ENTERING REDUCED January 31,1997 INVENTORY AND WITHOUT DRAINING STEAM GENERATOR TUBES INITIALS 5.19.3 Calculate when RVLIS should start trending down, when the reactor vessel level transmitters (LT-447/447A) should come on scale, and when 3000 gallons would be drained.
Record time when LI 433A goes off scale:
Letdown flow rate - (charging and seal injection) = drain rate in
[
bpm 1200 + Drain Rate =
minutes for RVLIS to start trending i
2000 + Drain Rate =
minutes for LT-447/447A to come on scale 3000 + Drain Rate =
minutes (max allowed per caution) 5.19.4 During the draindown, monitor for expected response from RVLIS and reactor vessellevel transmitters. Use the HUT level change as a backup to the calculated drainage time.
5.19.5 Perform a channel check of reactor vessel level instruments @
-90% reactor vessel level by comparing the 2 channels. Use computer addresses LT-447 and YXLT-447A, if available. If deviation between LI-447/447A is <3%, then indications are satisfactory.
If deviation between LI-447/447A is >3%, then perform another vent and purge ofL1-447/447A air and liquid sides.
If, after venting and purging LI-447/447A, they still do not agree within 3%, then notify I&C to perform a calibration check ofLI-447/447A before proceeding.
- CAUTIONa REACTOR VESSEL LEVEL s29% MAY ALLOW SG TUBES TO BURP.
5.20 Continue draining to a level of 70% which corresponds to approximately 19" below the RV flange, then:
l O
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9
NUCLEAR POWER BUSINESS UNIT OP 4D PART 5 i
OPERATING PROCEDURES MAJOR IPTE DRAINING THE REACTOR COOLANT SYSTEM TO Revision 1 A CVCS HUT WITHOUT ENTERING REDUCED January 31,1997 INVENTORY AND WITHOUT DRAINING STEAM GENERATOR TUBES INITIALS NOTE:
Thefollowing step will minimize RCP sealinjectionflow.
Ensure the CVCS system stabilizes without VCT divert.
5.20.1 Secure the operating charging pump.
5.20.2 Place the VCT divert valve control switch to the VCT position.
5,20.3 Decrease letdown flow to equal total charging flow.
5.20.4 Isolate the RCGVS from the PRT by shutting the following valves-RC-585 Shut RC-589 Shut
- CAUTIONa THE FOLLOWING STEP WILL HAVE A DYNAMIC EFFECT ON THE INDICATED REACTOR VESSEL LEVEL (LT-447/447A). THE
~
GREATER THE N PRESSUP2 IN THE RCS, 2
THE GREATER THE EFFECT. AS GAS IS BEING VENTED, LT-447 WILL INDICATE A LEVELINCREASE AND LT-447A WILL INDICATE A LEVEL DECREASE. IFITIS NECESSARY TO CHECK REACTOR VESSEL LEVEL PRIOR TO COMPLETING Tite VENTING OF THE RCS, THEN SHUT RC-586 l
OR RC-590, RCS PRESSURE SHOULD QUICKLY EQUALIZE, AND LT-447/447A l
SHOULD REFLECT ACTUAL LEVEL.
5.20.5 Vent the RCS via the RCGVS to the purge exhaust duct by opening the following valves:
RC-586 Open RC-590 Open O
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NUCLEAR POWER BUSINESS UNIT OP 4D PART 5 OPERATING PROCEDURES MAJOR IPTE DRAINING THE REACTOR COOLANT SYSTEM TO Revision 1 q
A CVCS HUT WITHOUT ENTERING REDUCED January 31,1997
{
ig INVENTORY AND WITHOUT DRAINING STEAM GENERATOR TL7BES INITIALS 5.21 Reduce PRT N supply regulator pressure to 1 psig.
2 5.22 RCDT Alignment NOTE:
This section is N/A if the RCDT waspreviously alignedfor an ILRTperSection 5.10.
5.22.1 Fill the RCDT to approximately 95% level while venting to the vent header.
5.22.2 Danger Tag RCDT to vent header valves:
WG-1786 Danger tag shut WG-1787 Danger tag shut 5.22.3 Danger tag shut RCDT to gas analyzer valves:
WG-1788 Danger tag shut WG-1789 Danger tag shut 5.22.4 Vent the RCDT to the PRT by opening and maintaining open RC-527.
5.22.5 Pump the RCDT to a normal operating level.
5.23 Secure RCP seal injection by shutting:
CV-300A "A" RCP seal injection throttle valve Shut CV-300B "B" RCP seal injection throttle valve Shut 5.24 Vent the PRT to containment atmospheric pressure.
5.24.1 Shut the PRT N supply valve RC-595.
Shut 2
(3 V
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NUCLEAR POWER JUSINESS UNIT OP 4D PART 5 OPERATING PROCEDURES MAJOR IPTE DRAINING THE REACTOR COOLANT SYSTEM TO Revision I A CVCS HUT WITHOUT ENTERING REDUCED January 31,1997 g
INVENTORY AND WITHOUT DRAINING STEAM W
GENERATOR TUBES INITIALS NOTE:
Thepresence of water in the vent line may inhibit venting.
Checkfor waterin the Tygon hose downstream ofRC-590.
Drain as necessary.
5.24.2 Vent the PRT to the purge exhaust by opening RC-585.
Open 5.24.3 Ifit is desired to speed up the venting process, perform the following. If not required, N/A steps a-e.
Open RC-589 to vent the PRT to the purge exhaust system.
a.
- b. Verify the head vent standpipe is drained via RC-588.
- c. Open RC-575C standpipe manual isolation valve.
- d. Open RC-575B standpipe solenoid valve at C-20.
When venting is complete, shut the following:
e.
RC-589 Shut RC-575C Shut RC-575B Shut NOTE:
Venfication ofredundant decay heat removal capability is required on only the initialdrain down after shutdown. If venfication was previously completed at the specifiedflow rate and temperature, then N/A allofStep 5.25.
5.25 Prior to opening or allowing maintenance on the RCS, verify single train (redundant) decay heat removal capability.
Verify redundant decay heat removal capability to maintain the RCS at s the desired temperature at s the specified RHR flow. Reference Precaution and Limitations 3.11.
O Page 22 of 31 REFERENCE USE
NUCLEAR POWER BUSINESS UNIT OP 4D PART 5 OPERATING PROCEDURES MAJOR IPTE DRAINING THE REACTOR COOLANT SYSTEM TO Revision 1 A CVCS HUT WITHOUT ENTERING REDUCED January 31,1997 INVENTORY AND WITHOUT DRAINING STEAM GENERATOR TUBES INITIALS
{
5.25.1 For a refueling shutdown, demonstrate the abihty to mamtam i
the RCS temperature s 140 F at s1,500 gpm RHR flow as follows.
OR 5.25.2 For a cold shutdown, demonstrate the ability to maintain the RCS temperature s 160 F at s 1,500 gpm RHR flow as follows.
If not previously done, reduce RHR trains to only one m a.
1 operation.
- b. Shut the RHR EX bypass valve, RH-626.
Shut the idle RHR train's HX outlet valve, RH-624 or c.
RH-625.
d..
Set RHR flow to 1,500 gpm.
Shut the idle train's RHR HX CCW inlet valve CC-738A or e.
CC-738B.
f.
If required, set the active train's RHR HX CCW throttle valve CC 824A or CC-824B at design flow (40* open).
l 4
- g. Ifrequired, set the CCW HX service water flow @ -4 psid for the CCW HXs lined up to the unit shutdown.
+
l 4
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NUCLEAR POWER EUSINESS UNIT OP 4D PART 5 OPERATING PROCEDURES MAJOR IPTE DRAINING THE REACTOR COOLANT SYSTEM TO Revision 1 A CVCS HUT WITHOUT ENTERING REDUCED January 31,1997 gl INVENTORY AND WITHOUT DRAINING STEAM w
GENERATOR TUBES INITIALS NOTE:
Ifleakby is suspected on RH-626, the valve may be manually isolatedfor this test by shutting RH-714A or RX-714B, the inlet or outlet isolation
\\
for RH-626.
NOTE:
Ifleakby is suspected on the idle RHR loop HX
\\
flow control valve (RH-624 or RH-62S), the idle train may be manually isolated by shutting RH-716A or RH-716B. A designated operatoris required to open this valve in the event offailure
\\
ofthe active RHR train.
- h. Verify that one train ofRHR is able to maintain the RCS at s 140*F for a refueling shutdown (s 160 F for a cold shutdown).
5.25.3 Realign the RHR system.
a.
Verify both RHR HX CCW throttle valves CC-824 A and CC-824B set at 30 open.
t c.
Verify open the idle RHR train's HX flow control valve manual isolation RH-716A or RH-716B.
- d. Verify open the manual isolation valves for RH-626, RH-714A, and RH-714B.
e.
Set RHR flow to 1,500 100 gpm and adjust RH-624, RH-625, and RH-626 as required to maintain the desired temperature.
f.
If required, reduce service water flow through the CCW Hxs to maintain the desired CCW/RHR temp.
5.26 Maintain RHR flow at 1000-1500 gpm.
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NUCLEAR POWER BUSINESS UNIT OP 4D PART 5 OPERATING PROCEDURES MAJOR IPTE DRAINING THE REACTOR COOLANT SYSTEM TO Revision 1 A CVCS HUT WITHOUT ENTERING REDUCED January 31,1997 INVENTORY AND WITHOUT DRAINING STEAM i
GENERATOR TUBES INITIALS NOTE:
The locallevelindicator, LI-447B, should only be valvedin when taking a reading. After taking a reading it should be valved out by j
shuning RC-522A.
i NOTE:
There is a 31/2" offset between the indicator on L1-447B and actual level. The scale on LI-447B is set to accountfor this so level can be read directlyfrom the scale. Ifa Tygon tube is used to measure level, you must use the tape on the wall r subtract 31/2" ifyou use 9
the scale anached to L1-447B.
NOTE:
RC-524 should have been opened during the performance of CL-4D or CL-4D Appendix A and sealinjection to RCPs should have been securedin previous Step S.23.
5.27 Place the reactor vessel level local indicator LI-447B in service by securing seal injection to B RCP Unit 1 (A RCP Unit 2) and opemng RC-524, RC-523, and RC-522A.
NOTE:
Abrupt starting / stopping the venting / draining ofLT-447/LT-447A can adversely affect their calibration.
5.28 With RCS at atmospheric pressure, compare LI-447/447A indicated level to local level. Reference attached Table I for level cross reference values.
Use computer addresses LT-447 and YXLT-447A if available.
5.28.1 IfLI-447B agrees with LI-447/447A within 3% (3"), then indications are satisfactory.
5.28.2 If LI-447B does not agree with LI-447/447A within 3% (3"),
then vent and purge the air and liquid sides ofLI-447/447A.
5.28.3 If, after venting and purging LI-447/447A, they still do not agree with LI-447B, with 3% (3"), then request I&C to perform a calibration check ofLI-447/447A.
5.29 Valve out LI-447B by shutting RC-522A.
Shut O
Page 25 of 31 REFERENCE USE
NUCLEAR POWER BUSINESS UNIT OP 4D PART 5 OPERATING PROCEDURES MAJOR IPTE DRAINING THE REACTOR COOLANT SYSTEM TO Revision 1 A CVCS HUT WITHOUT ENTERING REDUCED January 31,1997 INVENTORY AND WITHOUT DRAINING STEAM GENERATOR TUBES INITIALS 5.30 RHR Letdown and Chareing Valve Alienment NOTE:
Letdownflow controlshouldbe with CV-135. RHRletdown isolation valves, RH-715Cand CV-369A shouldbe wide open andnot used as throttle valves.
NOTE:
A normalchargingpath through atleast one chargingpump should be maintained when the charging pumps are secured 5.30.1 Verify letdown flow is bypassing the VCT as follows:
CV-110B Open CV-11OC Open CV-256A VCT Inlet Isolation Shut 4
i 5.30.2 Position the letdown diven valve, CV-112A, to the "VCT" position.
5.30.3 Shut CV-256B, divert manualisolation valve.
Shut 5.30.4 Disable the VCT auto makeup feature with the " Reactor Makeup" switch.
5.30.5 Fully open charging flow control valve, CV-142.
5.30.6 Secure any operating charging pumps.
NOTE:
Interlock between CV-112B&Cprevents the closure ofthe VCToutlet, CV-112C, unless the emergency makeup, CV-112B, is notfully closed 5.30.7 Shut the VCT outlet MOV CV-ll2C as follows:
Momentarily open CV-112B.
a.
- b. Shut CV-112C.
- c. Shut CV-112B.
l Page 26 of 31 REFERENCE USE e
NUCLEAR POWER BUSINESS UNIT OP 4D PART 5 OPERATING PROCEDURES MAJOR I
IPTE DRAINING THE REACTOR COOLANT SYSTEM TO Revision 1 A CVCS HUT WITHOUT ENTERING REDUCED January 31,1997 INVENTORY AND WITHOUT DRAINING STEAM GENERATOR TUBES INITIALS 5.30.8 Adjust CV-135 for the desired purification flow rate.
l 3
a 5.30.9 Verify that letdown flow equals charging flow by control board i
indication.
i 5.31 Verify reactor vessel level stable and set the reactor vessel level high and low alarms at i 3% from actuaUdesired level for LC-447/447A.
5.31.1 LC-447 3% above actualleveUdesired level i
)i 5.31.2 LC-447A 3% above actual leveUdesired level 5.31.3 LC-447 3% below actualleveUdesired level 1
5.31.4 LC-447A 3% below actual leveUdesired level l
4 5.32 Shut / check shut boric acid flow control valve CV-Il0A by placing the j
control switch on C04 in the close position.
5.33 After Maintenance has removed:
i i
Reactor head vent system spoolpiece 3
AND 1
Blank flange between RC-576 and RC-577 j
Then clear the danger tags and shut the following valves:
RC-570A Reactor vessel head vent solenoid valve Shut l
RC-570B Reactor vessel head vent solenoid valve Shut RC-580A Pressurizer vent isolation valve Shut j
RC-580B Pressurizer vent isolation valve Shut l
RC-575A Combine gas vent to PRT SOV Shut 1
1 O
Page 27 of 31
, REFERENCE USE t
i
NUCLEAR POWER BUSINESS UNIT OP 4D PART 5 OPERATING PROCEDURES MAJOR IPTE DRAININO THE REACTOR COOLANT SYSTEM TO Revision 1 A CVCS HUT WITHOUT ENTERING REDUCED January 31,1997 INVENTORY AND WITHOUT DRAINING STEAM GENERATOR TUBES 5.34 Further reactor vessel level adjustments should be per OP-5A, Section B.
Recovery from a condition that has caused or could lead to inadequate core cooling must be per SEP-1 Degraded RHR System Capability.
5.35 As soon as practical, start processing the drain down water in the CVCS HUT to increase the boron concentration to ~2000 ppm so it can be used to refill the RWST/ cavity.
O O
Page 28 of 31 REFERENCE USE
1 NUCLEAR POWER BUSINESS UNIT OP 4D PART 5 OPERATING PROCEDURES MAJOR IPTE DRAINING THE REACTOR COOLANT SYSTEM TO Revision 1 A CVCS HUT WITHOUT ENTERING REDUCED January 31,1997 4
INVENTORY AND WITHOUT DRAINING STEAM GENERATOR TUBES TABLEI REACTOR VESSEL LEVEL COMPARISON TABLE LI-447B or Elevation LI-447/447A Tygon NIS top hats 41'3" 96.1 %
96 1/8" Incore seal table 41'2" 95.1 %
95 1/8" i
Steam generator tubesheet bottom 41'1 1/2"
>94.6%
94 5/8" Reactor vessel flange 40'8" 89.1 %
89 1/8" RCP volute flange 38'3" 60.1 %
60 1/8" Steam generator channel head 36'2 1/2" 35.6 %
35 5/8" Reactor vessel Th nozzle top 35'7 3/8" 29.0 %
29" Reactor vessel Th nozzle 3/4 35'5/8" 22.0 %
22" Reactor vessel Th nozzle centerline 34'5 3/8" 14.5 %
14 1/2" Reactor vessel Th nozzle bottom 33'2 7/8" 0%
0" O
Page 29 of 31 REFERENCE USE.
NUCLEAR POWER BUSINESS UNIT OP 4D PART 5 OPERATING PROCEDURES MAJOR IPTE DRAINING THE REACTOR COOLANT SYSTEM TO Revision 1 A CVCS HUT WITHOUT ENTERING REDUCED January 31,1997 INVENTORY AND WITHOUT DRAINING STEAM g
GENERATOR TUBES FIGURE 1 il
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g Page 30 of 31 REFERENCE USE
l NUCLEAR POWER BUSINESS UNIT OP 4D PART 5 OPERATING PROCEDURES MAJOR IPTE DRAINING THE REACTOR COOLANT SYSTEM TO Revision 1 m
A CVCS HUT WITHOUT ENTERING REDUCED January 31,1997 tj INVENTORY AND WITHOUT DRAINING STEAM GENERATOR TUBES FIGURE I A g
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Page 31 of 31 REFERENCE USE