ML20092F831
| ML20092F831 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 02/23/1990 |
| From: | GEORGIA POWER CO. |
| To: | |
| Shared Package | |
| ML20092F288 | List:
|
| References | |
| CON-IIT05-002-135-90, CON-IIT05-080-90, CON-IIT5-2-135-90, CON-IIT5-80-90, RTR-NUREG-1410 13005-1, NUDOCS 9202190522 | |
| Download: ML20092F831 (28) | |
Text
_, _._ _ __ _..__. _
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Approval Procedure No.
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Vogtla Electric Generating Plent y"
-13005-1
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NUCLEAR OPERATIONS L
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10-4 Unit 1
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REACTOR COOLANT SYSTEM DRAINING 3
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1.0 PURPOSE fu>i 4
This procedure provides the necessary instructions for i
partially draining the Reactor Coolant System (RCS).
i Procedure instructions include the following:
i 4.1 RCS Draining Via The RCDT e
4.2 RCS Draining Via The RHR System
)
4.3 Preparation For Opening The RCS Following_ Draining Via The RCDT 9
4 4.4 Opening The RCS To Atmosphere l
2.0 PRECAUTIONS AND LIMITATIONS j
2.1
,AECAUTIONS 4
2.1.1 During the early stages of an RCS drain operation, a nitrogen gas blanket should be provided in the pressurizer and Reactor Vessel Head to avoid a hydrogen hazard when air is initially admitted to the system l
through the vents.
2.1.2 The RCS level shall be maintained greater than or equal to an elevation of 188 feet whenever the Residual Heat l.
Removal (RHR) System is in service except for Steam Generator tube burping at which time level will be i
maintained at 187 feet 6 inches.
2.1.3 During draining-to one foot above mid-nozzle (188 l-feet), trend RHR. Pump parameters on ERF for early.
detection of possible RHR Pump degradation due to vortexing, s
2.1.4 Seal injection flow to the Reactor Coolant Pump-(RCP) seals shall be established if.the water level in the.
RCS is above the level of the-seals in the RCP. _This prevents crud-infiltration into the seal chamber.
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e PROCEDURE No.
REVISloN PAGE No-VEGP 13005-1 10 2 of 28
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2.1.5 The RCS should not be drained to the point where air will enter the RCS from the pressurizer surge line, s_
unless the proposed maintenance requires it.
This prevents draining of the SG tubes.
2.1.6 Observe all applicable Health Physics procedures when venting radioactive gases and vapor.
2.1.7 The Health Physics Department should be notified prior to performing evolutions which may significantly affect radiation levels.
2.1.8 If it is intended to drain down to perform maintenance on Reactor Head, Steam Generators (SG's) or RCP Seals, then the following RCS Level Controls should be placed into effect:
a.
If it is intended to operate at one foot above mid-nozzle level, the preferred RHR configuration is one train operating with a flow of 3000 gpm, b.
Tygon tube watch is required any time the RCS level is being changed while the RCS level is below 17% (approximately 207 feet elevation) pressurizer level,
()
c.
Periodic comparison checks should be made every 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> between the Control Room temporary RCS Level Monitors and the Tygon tube, d.
The Control Room Monitors should a gree within 7 l
percent of scale with the Tygon tube, e.
Two out of three Level Monitors must agree before draining RCS level below the top of the hot leg (188 feet 3 inches),
f.
If neither Control Room RCS Level Monitor is available, then a continuous Tygon tube watch should be established while RCS level is below 17%
pressurizer level, g.
While level is in the region of the hot legs, trend RHR Pump parameters on ERF for early detection of possible RHR Pump degradation due to vortexing.
2.1.9 If level indication is lost or becomes suspect, draining will be stopped and the problem with the indication resolved.
If necessary, raise RCS level to restore indications.
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Prod'EDURE No.
REVIS!oN PAGE No.
VEGP 13005-1 10 3 of 28 O,
2.1.10 Only one dra'in path shall be used at a time and operators shall be aware of the path being used.
Appropriate log entries shall be made to keep personnel aware of drain flow paths.
2.1.11 When draining via the Reactor Coolant Drain Tank (RCDT), do not drain from the same loop (s) that are being monitored for level.
2.2 LIMITATIONS 2.2.1 During Cold Shutdown (Mode 5) with the Reactor Coolant Loops filled, one RHR train shall be operable and in operation and either one additional train shall be operable or the secondary side water level of at least two Steam Generators shall be greater than 171 wide range.
(Technical Specification 3.4.1.4.1) 2.2.2 During Cold Shutdown (Mode 5) with Reactor Coolant Loops not filled, two RHR trains shall be operable with one train in operation.
(Technical Specification 3.4.1.4.2) 3.0 PREREQUISITES AND INITIAL CONDITIONS 3.1 The Recycle Holdup Tanks are capable of receiving drain O
effluent.
3.2 The Liquid Waste Processing System is capable of receiving drain effluent.
3.3 The Auxiliary Gas System - Nitrogen is operating.
3.4 The Pressurizer Relief Tank (PRT) is in service, with 3-5 psig N2 Pressure.
3.5 The RCDT is in service with discharge aligned to the Recycle Holdup Tank.
3.6 The RHR System is operating with RHR letdown in service.
3.7 The RCS has been prepared for system. draining per Section D of 12006-C, " Unit Cooldown To Cold Shutdown".
3.8 Communications have been established between the Control Room and. Containment to ensure adequate RCS level and pressure monitoring during the draining operation.
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t-PROCEDURE No.
REVISloN PAGE No.
VEGP 13005-1 10 4 of 28
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4.0 INSTRUCTIONS
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4.1 RCS DRAINING VIA THE RCDT 4.1.1 RACK OUT and TAG the applicable breakers per Table 1.
4.1.2 If the RCS is to be drained below 25% Pressurizer Cold Calibration Level 1-LI-0462, NOTIFY Maintenance to install the RCS level monitoring instrumentation per 54840-1, " Installation And Removal Instructions For The RCS Temporary Level Indication Tygon Tube And The Defeat Of The Residual Heat Removal Suction Valve Auto Closure Interlock".
4.1.3 NOTIFY Maintenance to install the spool piece in the common RCS Loop Drain Header upstream of Loop Drain Header Isolation 1-1901-U6-242.
4.1.4 VERIFY the Recycle Holdup Tanks have sufficient capacity to support draining operations.
4.1.5 ALIGN nitrogen from the PRT to the Pressurizer steam space as follows:
4.1.5.1 CONNECT temporary supply hose from the PRT Vent to the Pressurizer Spray Line Vent:
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a.
REMOVE Blind Flange at PRT Vent Valve 1-1201-U4-115 and INSTALL a Chicago fitting at
- flange, b.
ATTACH a hose to the Chicago fitting at valve 1-1201-U4-115, c.
REMOVE pipe cap at the Pressurizer Spray Line Vent Valve 1-1201-X4-084 and INSTALL a Chicago fitting, d.
ATTACH the other end of the hose installed in Step 4.1.5 lb to the Chicago fitting at Vent Valve 1-1201-X4-084.
O 703445
PROCEDURE No.
REYlSloN PAGE No.
VEGP 13005-1 10 5 of 28 NOTE Ensure that the hose connected in Step 4.1.5.1d slopes upward or vertical all the way from the PRT to the Pressurizer Spray Line Vent with no restricting kinks.
4.1.5.2 ALIGN nitrogen through the Pressurizer Safety Loop Seal Drain Header, a.
ENSURE CLOSED Reactor Head Vents To Pressurizer Relief Tank 1-HV-0442A and 1-HV-0442B, b.
ENSURE OPEN Pressurizer Relief Tank Nitrogen Supply Isolations 1-HV-8033 and 1-HV-8047,
,-PV-0455B and ENSUREOPENPressurizerSprays{i c.
1-PV-0455C, l1 Drain Header OPENPressurizerSafetyLoopSe(y d.
Isolation 1-1201-U4-105, e.
OPEN Pressurizer Safety 1-PSV-8010A Loop Seal Drain 1-1201-04-102.
4.1.5.3 ALIGN nitrogen through the temporary hose connection from PRT to Preusurizer Spray Line Vent:
a.
OPEN PRT Vent valve 1-1201-U4-115, b.
OPEN Pressurizer Spray Line Vent Valves 1-1201-X4-072 and 1-1201-X4-084.
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10M45
PROCEDURE No.
AEVISloN PAGE No.
VEGP 13005-1 10 6 of 28 Os 4.1.6 ALIGN the Reactor Coolant Drain Tank (RCDT) and pumps as follows:
NOTE All controls are located on local Panel PLPP unless otherwise noted, a.
ENSURE both RCDT Pumps are stopped (1)
RCDT Pump fl, 1-HS-1003A, (2)
RCDT Pump #2, 1-HS-1003B.
b.
CLOSE RCDT Recirculation 1-HV-7144, c.
CLOSE RCDT Outlet Isolation 1-HV-7127, d.
ENSURE RCDT To PRT Isolation 1-HV-7141 is closed, e.
UNLOCK and OPEN RCDT Level Control Bypass 1-1901-U6-038, f.
At Control Room Panel QMCB, ENSURE OPEN RCDT Pump Discharge Inside and Outside Containment O
Isolations 1-HV-7699 and 1-HV-7136.
4.1.7 UNLOCK and OPEN RCS Loop Drain Header Isolation 1-1901-U6-242.
CAUTION Do not drain from the same loop (s) that are being monitored for RCS level.
4.1.8 OPEN at least one pair of the following valves to allow draining of the RCS:
4.1.8.1 RC Loop 2 Drain Isolation 1-1201-U4-052 RC Loop 2 Drain To RCDT Isolation 1-1201-U4-208 4.1.8.2 RC Loop 3 Drain Isolation 1-1201-U4-030 RC Loop 3 Drain To RCDT Isolation 1-1201-U4-209 4.1.8.3 RC Loop 4 Drain Isolation 1-1201-U4-071 RC Loop 4 Drain To RCDT Isolation 1-1201-U4-206 l
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PROCEDURE No.
edviSiONY
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PAGE NO, VEGP 13005-1 10 7 of 28
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NOTE Draining the RCS-commences with the start of the RCDT-
' Pumps.
4.1,9 DRAIN _the RCS to 50% Pressurizer Level 1-LI-0462 as follows:
a.
START at least one RCDT Tump, (1)
RCDT Pump 11 using 1-HS-1003A, (2)
RCDT Pump 12 using 1-HS-1003B, CAUTION The.PRT Rupture Disks may fail if-a vacuum-is drawn in the'PRT.
b.
MONITOR PRT Pressure 1-PI-0469, e
c.
MONITOR RCS Pressure on the temporary gauge at-1-1201-U4-100, NOTES a.
If the activity level in the Waste Gas Decay Shutdown Tank-is sufficientlyzlow to conform to ALARA as determined by Health Physics and Chemistry, _
the Waste Gas System may be used to su) ply nitrogen for draining the RCS. -IfLWaste Gas System-is used, refer to-Step 4.1.2 of 13004-1,
" Pressurizer Relief. Tank-Operation",
b.
At the discretion of the Unit-Shift-Supervisor (USS),-
Nitrogen (N3) pressure may be raised abova normal pressure in the PRT to enhance maintenance of a' positive-pressure in the.RCS and the PRT.
d.
ADJUST PRT Nitrogen Supply Regulator 1-PCV-8034 ar O'
CYCLE RCDT Pumps as necessary-to maintain a positive PRT Pressure 1-PI-0469.
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i'RoCtDUitt NO HLvisigt;
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' fact No.
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VECP 13005-1 10 8 of 28 O
4.1.10 At 50% Pressurizer Level 1-LI-0462, ~STOP drair.'.ng as follows:
ENSURE poth RCD' Pumps are stopped:
a.
(1)
RCDT Pump #1, 1-HS-1003A, (2)
RCDT Pump l2, 1-HS-1003B.
b.
CLOSE RCDT Pump Discharge Inside Containment Isolation 1-HV-7699.
4.1.11 If it is desired to stop draining and open the RCS, PERFORM Step 4.3.
NOTE The Peactor Vessel Flan 6e is at an elevation of 194 reet.
4.1.12 To continue draining the RCS to the Reector Vessel Flange, PLACE the Tygon hose level indication in service as follows:
a.
Slowlv OPEN Pressurizer Steam Space '
le Vent I!T_207-U4-100, 11, b.
OPEN RCS Loop 1 Drain Isolation 1-20 e
c.
Slowly OPEN RCS Loop 1 Tygon Hose ll".uv Pf n luolation 1-1201-04-003.
4.1.13 NOTIFY IEC Department to install the remote RCS level monitoring instrumentation per 23985-1, "RCS Temporary Water Level System".
4..
14 If the Reactor Vessel Head has not been vented to to the Reactor atmosphere per Step 4.4, then SUPPLY N2 Vessel Head as follows:
a.
ENSURE CLOSED RCS Excess Letdown Heat Exchanger Inlet 1-HV-8098, b.
OPEN all Reactor Head Vent Isolations:
(1) 1-HV-8095A, (2) 1-HV-8096A, (3) 1-HV-8095B, (4) 1-HV-8096B.
c.
OPEN both Reactor Head Vents To Pressurizer Relief 7(
Tanks
(
(1) 1-HV-0442A, (2) 1-HV-0442B.
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Wor;;g-VEGP 13005-1 10 9 of 28 CAUTION
(}
Maintain a positive pressure in the RCS.
Do not drain the RCS at a rate faster than nitrogen can be fed into the RCS.
A negative pressure may collapse the Tygon hose, cause a false reading on Tygon tube vessel level indication and the pressurizer level indication.
4.1.15 DRAIN the RCS to an elevation of 194 feet as indicated by the Tygon hose as follows:
a.
OPEN RCDT Pump Discharge Inside Containment Isolation 1-HV-7699 by holding 1-HS-7699 in OPEN until the valvo is fully open, b.
START at least one RCDT Pumps (1) 1-HS-1003A for RCDT Pump fl, (2) 1-HS-1003B for RCDT Pump 12.
CAUTION The PRT Rupture Disks may fail if a vacuum is drawn in the PRT.
c.
MONITOR PRT Pressure 1-PI-0469, d.
MONITOR RCS Pressure on the temporary gauge at 1-1201-U4-100, NOTE If the activity level in the Waste Gas Decay Shutdown Tank is sufficiently low to conform to ALARA as determined by Health Physics and Chemistry, l
the Waste Gas System may be used to supply nitrogen.for draining the RCS.
If Waste Gas System is used, refer to Step 4.1.2 of 13004-1, " Pressurizer Relief Tank Operation".
e.
ADJUST PRT Nitrogen Supply Regulator 1-PCV-8034 or CYCLE RCDT Pumps as required to maintain a
[)
positive PRT Pressure 1-PI-0469.
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P4oCEDURE No-HEVilloN PAGE No.
VEGP 13005-1 10 10 of 28 4.1.16 At 194 feet,'STOP draining as folloos:
[}
a.
ENSURE both RCDT Pumps are stopped:
(1)
RCDT Pump #1, 1-HS-1003A, (2)
RCDT Pump 12, 1-HS-1003B.
b.
CLOSE RCDT Pump Discharge Inside Containment Isolation 1-HV-7699.
4.1.17 If it is desired to stop draining and open the RCS, PERFORM Step 4.3.
4.1.18 At the USS discretion, Steam Generator Tube bundles may be drained by the addition of nitrogen to the Steam Generator Channel Heads per Checklist 1.
CAUTIONS a.
If the Steam Generators were not drained per Step 4.1.18, then as the RCS water level reaches the Reactor Vessel Nozzleu, the coolant will begin to drain from the SG's in slugs causing erratic O
level indication.
b.
Upon approaching RCS hot leg region, trend RHR Pump parameters on ERF for early dete: tion of possible RHR Pump degradation due to vortexing.
NOTE The middle of the vessel nozzles is at an elevation of 187 feet.
4.1.19 To continue draining the RCS to the 188 feet - 0 inches elevation, PERFORM the following:
a.
OPEN RCDT Pump Discharge Inside Containment Isolacion 1-HV-7699 by holding 1-HS-7699 in OPEN until the valve is fully open, b.
START at least one RCDT Pumps (1)
RCDT Pump #1, 1-HS-1003A, (2)
RCDT Pump 12, 1-HS-1003B.
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P.XoctDUHE No.
ALvisioN PAbt(w VEGP 1300$-1 10 11 of 28
'( )
CAUTION The PRT Rupture Disks may fail if a vacuum is drawn in the PRT.
c.
MONITOR PRT Pressure 1-PI-0469, l
d.
MONITOR RCS Preasure on the temporary gauge at 1-1201-U4-100, c.
ADJUST PRT Nitrogen Supply Regulator 1-PCV-8034 or CYCLE RCDT Pumps as required to maintain a positive PRT Pressure 1-PI-0469.
NOTE If the Steam Generators were not drained per Step 4.1.18, then during burping of the SGs the level abould be lowered to elevation 187 feet 6 inches to facilitate SG draining.
Level will be erratic durin g
this operation, and should
">e closely monitored.
When SG draining is complete, raise O
and maintain level at 188 feet.
4.1.20 At 188 feet, STOP draining as follows:
a.
ENSURE both RCDT Pumps are stopped (1)
RCDT Pump fl.
1-HS-1003A, (2)
RCDT Pumo 12, 1-HS-1003B.
b.
CLOSE RCDT Pump Discharge Inside Containment Isolation 1-HV-7699.
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PHoCEDUHF No.
RgyssioN pao g Noi ""~ ~~~ ~ ~~~~
VEGP 13005-1 10 12 of 28 O.
4.1.21 If the SG Manways are to be opened, then DRAIN the SG Channel Head by opening the applicable SG Channel Head l
Drain Line Isolation and Root Valves:
a.
SG 1 1-1201-U4-202, 1-1201-04-247, b.
SG 2 1-1201-04-203, 1-1201-04-248, 1
c.
SG 3 1-1201-U4-204, 1-1201-U4-249, d.
SG 4 1-1201-U4-205, 1-1201-U4-250.
NOTE SG Channel Head Drain Valves will remain open while manways are off.
4.1.22 To open the RCS, PERFORM Step 4.3.
4.2 RCS DRAINING VIA THE RHR SYSTEM
()
4.2.1 RACK OUT and TAG the applicable breakers per Table 1.
4.2.2 If the RCS is to be drained below 25% Pressurizer Cold Calibration Level 1-LI-0462, NOTIFY Maintenance to install RCS level monitoring instrumentatian per 54840-1, " Installation And P.emoval Instructions For The RCS Temporary Level Indication Tygon Tube And The Defeat of The Residual Heat Removal Suction Valve Auto Closure Interlock".
4.2.3 VERIFY the Recycle Holdup Tanks have sufficient capacity to support draining operations.
O l
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PAOCEDURE NO REVISloN PAGE No.
VEGP 13005-1 10 13 of 28
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4.2.4 ALICNnitrofenfromthePRTtothePressurizersteam space as fo lows:
4.2.4.1 CONNECT nitrogen supply hose from the PRT Vent to the j
Pressurizer Spray Line Vents a.
REMOVE blind flange at PRT Vent Valve 1-1201.U4-115 and INSTALL a Chicago fitting at
- flange, b.
ATTACH a hose to the Chicago fitting at valve 1-1201-U4-115, REMOVE pipe cap at Pressurizer Spray Line Vent c.
velve 1-1201-X4-084 and INSTALL a Chicago fitting, d.
ATTACH the other end of the hose installed in Step 4.2.4.lb to the Chicago fitting at Vent Valve 1-1201-X4-084.
NOTE Ensure that the hose connected in Step 4.2.4.lb slopes upward or vertical all the way from O
the PRT to the Pressurizer Spray Line Vent with no restricting I
kinks.
4.2.4.2 ALIGN nitrogen through the Pressurizer Safety Loop Seal l
Drain Header, l
a.
ENSURE CLOSED Reactor Head Vents To Pressurizer l
Relief Tank 1-HV-0442A and 1-HV-0442B, b.
ENSURE OPEN Pressurizer Relief Tank Nitrogen Supply Isolations 1-HV-8033 and 1-HV-8047, c.
ENSURE OPEN Pressurizer Sprays 1-PV-0455B and l
1-PV-04550, d.
OPEN Pressurizer Safety Loop Seal Drain Header l
Isolation 1-1201-U4-105, I
I e.
OPEN Pressurizer Safety 1-PSV-8010A Loop Seal l
Drain 1-1201-U4-102, 4.2.4.3 ALIGN nitrogen through the temporary hose connection from PRT to the Pressurizer Spray Line Vent, f-a.
OPEN PRT Vent Valve 1-1201-U4-115, b]
b.
OPEN Pressurizer Spray Line Vent Valves 1-1201-X4-072 and 1-1201-X4-084.
?C344%
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PROCEDURE No HEVISloN PAGE No.
VEGP 13005-1 10 14 of 28
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4.2.5 ENSURE RHR letdown is in service.
4.2.6 INITIATE RCS draining as follows:
NOTE If chemistry conditions require draining through the CVCS mixed bed, 1-TV-0129 must be positioned to the CVCS mixed bed.
a.
PLACE Letdown To Demin/VCT, 1-TV-0129 to the VCT, b.
PLACE Letdown Divert 1-HV-0112A in the HUT
- position, NOTE Letdown flow should be limited to 120 gym to prevent exceeding design itow through the Mixed Bed Demineralizer and the Reactor Coc?. ant Filter.
c.
ADJUST Letdown Pressure Controller 1-PIC-0131 as required to obtain the desired Letdown Flow O
1-FI-0132A (RCS drain rate),
CAUTION I
The PRT Rupture Disks may fail-if a vacuum is drawn in the PRT.
d.
MONITOR PRT Pressure 1-PI-0469,
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m.
_.. - - _ =..
PROCEDURE No.
REVIStoN PAGE No.
VEGP 13005-1 10 15 of 28 NOTES 1
a.
If the activity level in the Waste Gas Decay Shutdown Tank is sufficiently low to conform to ALARA as determined by Health Physics and Chemistry, the Waste Gas System may be used to supply nitrogen for draining the RCS.
If Waste Gas System is used, refer to 13004-1, " Pressurizer Relief Tank Operation".
b.
At the discretion of the USS, No pressure may be raised above n6rmal pressure in the PRT to enhance maintenance of a positive pressure in the RCS and PRT.
ADJUST PRT Nitrogen Supply Regulator 1-PCV-8034 or e.
1-PIC-0131 as required to maintain a positive PRT Pressure 1-PI-0469.
4.2.7 MAINTAIN VCT Level 1-LI-0185 between 30% and 50% while O
draining as follows:
a.
When 1-LI-0185 falls-to 30%, PLACE Letdown Divert 1-HV-0112A in the VCT position, b.
When 1-LI-0185 rises to 50%, PLACE 1-HV-0112A in the HUT position.
i 4.2.8 MONITOR Pressurizer Level 1-LI-0462.
4.2.9 At 50% Pressurizer Level 1-LI-0462, STOP draining as follows:
a.
PLACE Letdown Divert 1-HV-0112A in the VCT
- position, b.
ADJUST Letdown Pressure Controller 1-PIC-0131 and/or charging and seal injection to maintain Pressurizer Level 1-LI-0462 between 40% and 50%.
4.2.10 If it is desired to stop draining and open the RCS, PERFORM Step 4.4.
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PRoCLDURE No.
REVISloN PAGE No.
VEGP 13005-1 10 16 of 28 O
"o=
The Reactor Vessel Flange is at an elevation of 194 feet.
4.2.11 To continue draining the RCS to the Reactor Vessel Flange, PLACE the Tygon hose level indication in service as follows:
a.
Slowly OPEN Pressurizer Steam Space Sample Vent 1-1201-U4-100, b.
OPEN RC Loop 1 Drain Isolation 1-1201-U4-001, c.
Slowly OPEN RC Loop 1 Tygon Hose Connection Isolation 1-1201-U4-003, 4.2.12 NOTIFY I&C Department to install the remote RCS level monitoring instrumentation per 23985-1, "RCS Temporary Water Level System".
4.2.13 If the Reactor Vessel Head has not been vented to to the Reactor atmosphere per Step 4.4, then SUPPLY N2 Vessel Head as follows:
a.
ENSURE CLOSED RCS Excess Letdown Heat Exchanger O
Inlet 1-HV-8098, b.
OPEN all Reactor Head Vent Isolations:
(1) 1-HV-8095A, (2) 1-HV-8096A, (3) 1-HV-8095B, (4) 1-HV-8096B.
c.
OPEN both Reactor Head Vents To Pressurizer Relief Tanks (1) 1-HV-0442A, (2) 1-HV-04428.
1 O
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PROCEDURE No REVi$loN PAGE No.
VEGP 13005-1 10 17 of 28 l
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CAUTION Maintain a positive pressure in the RCS.
Do not drain the RCS l
at a rate faster than nitrogen l
can be fed into the RCS.
A negative pressure may collapse the Tygon hose, cause a false reading on the Tygon tube and j
the pressurizer level indication.
l 4.2.14 DRAIN the RCS to an elevation of 194 feet as indicated by the Tygon hose as follows:
a.
PLACE Letdown Divert 1-HV-0112A in the HUT
- position, NOTE Letdown flow should be limited to 120 gpm to prevent exceeding design flow through the Mixed Bed Demineralizer and the Reactor Coolant Filter, r~T b.
ADJUST Letdown Pressure Controller 1-PIC-0131 as
(_)
required to obtain the desired Letdown Flow i
1-F1-0132A (RCS drain rate),
CAUTION l
The PRT Rupture Disks mrsy fail if a vacuum is drawn in the PRT.
l c.
MONITOR PRT Pressure 1-PI-0469, d.
MONITOR RCS Pressure on the temporary gauge at 1-1201-U4-100, l
O 10344%
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\\TCP 13005-1 10 18 of 28 NOTE If the activity level in the Waste Gas Decay Shutdown Tank is sufficiently low to conform to ALARA as determined by Health Physics and Chemistry, the Waste Gas System may be used to su? ply nitrogen for draining the RCS.
If Waste Gas System is used, refer to Step 4.1.2 of 13004-1,
" Pressurizer Relief Tank Operation".
If applicable, ADJUST PRT Nitrogen Supply e.
Regulator 1-PCV-8034 or 1-PIC-0131 as required to maintain a positive PRT Pressure 1-PI-0469.
4.2.15 MAINTAIN VCT Level 1-LI-0185 between 30% and 50% while draining as follows:
a.
When 1-LI-0185 falls to 301, PLACE Letdown Divert 1-HV-0112A in the VCT position, b.
When 1-LI-0185 rises to 50%, PLACE 1-HV-0112A in O
the HUT position.
4.2.16 At 194 feet, STOP draining as follows:
a.
PLACE Letdown Divert 1-HV-0112A in the VCT
- position, b.
ADJUST Letdown Pressure Controller 1-PIC-0131 and/or charging and seal injection to MAINTAIN RCS level at 194 feet.
4.2.17 If it is desired to stop draining and open the RCS, PERFORM Step 4.4.
4.2.18 At the USS discretion, Steam-Generator Tube bundles may be drained by addition of nitrogen to the Steam Generator Channel Heads per Checklist 1.
O 103441
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esoctpunt No.
~~~'TgsEon pAot uo.
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VEGP 13005-1 10 19 of 28
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()
CAUTIONS
~
a.
If the Steam Generators were not drained per Step 4.2.18, then as the RCS water level reaches the Reactor Vessel Nozzles, the coolant will begin to drain from the SG's in slugs causing erratic level indication b.
Upon approaching RCS hot leg region, closely monitor RHR Pump suction and discharge pressure as well as RHR flow rate to ensure early detection of RHR degradation due to vortexing at the RHR Pump suction.
NOTE The middle of the vessel nozzles is at an elevation of 187 feet.
4.2.19 To continue draining the RCS to 188 feet - 0 inches elevation, PERFORM the following
(
a.
PLACE Letdown Divert 1-HV-0112A in the HUT
- position, NOTE Letdown flow should be limited to 120 gpm to prevent exceeding design flow through the Mixed Bed Demineralizer and the Reactor Coolant Filter.
b.
ADJUST Letdown Pressure Controller 1-PIC-0131 as required to obtain the desired Letdown Flow 1-FI-0132A (RCS drain rate),
CAUTION The PRT Rupture Disks may fail if a vacuum is drawn in the PRT.
c.
MONITOR PRT Pressure 1-PI-0469, d.
MONITOR RCS Pressure on the temporary gauge at 1-1201-U4-100, O
If applicable, ADJUST PRT Nitrogen Supply e.
Regulator 1-PCV-8034 or 1-PIC-0131 as required to maintain a positive PRT Pressure 1-PI-0469.
703445
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PAoCLDURE No.
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PAGE No.
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VEGP 13005-1 10 20 of 28 4.2.20 MAINTAIN VCT' Level 1-LI-0185 between 30% and 50% while O
draining as follows:
a.
When 1-LI-0185 falls to 301, PLACE Letdown Divert 1-HV-0112A in the VCT position, b.
When 1-LI-0185 rises to 50%, PLACE 1-HV-0112A in the HUT position.
1;0TE If the Steam Generators were not drained per Step 4.2.18, then during burping of the SGs, the level should be lowered to elevation 187 feet 6 inches to facilitate SG draining.
Level will be erratic during this operation, and should be closely monitored.
When SG draining is complete, raise and maintain level at 188 feet.
4.2.21 At 188 feet STOP draining as follows:
a.
PLACE Letdown Divert 1-HV-0112A in the VCT O
- position, b.
ADJUST Letdown Pressure Controller 1-PIC-0131 and/or charging and seal injection to maintain RCS level at 188 feet.
4.2.22 If the SG Manways are to be opened, then DRAIN the SG Channel Head by opening the applicable SG Channel Head Drain Line Isolation and Root Valves:
a.
SG 1 1-1201-U4-202, 1-1201-U4-247, b.
SG 2 1-1201-U4-203, 1-1201-U4-248, c.
SG 3 1-1201-U4-204, 1-1201-U4-249, d.
SG 4 1-1201-U4-205, 1-1201-U4-250.
NOTE SG Channel Head Drain Valves O
will remain open while manways are off.
4.2.23 To open the RCS, PERFORM Step 4.4.
w.s l
L..
PAocEDUHE No.
HEVI5loN PAGE No, VEGP 13005-1 10 21 of 28 4.3 PREPARATION FOR OPENING THE RCS F0tt0 WING DRAINING VIA THE RCDT 4.3.1 RESTORE normal RCDT alignment as follows:
I a.
CLOSE and LOCK RCS Loop Drain Header Isolation 1-1901-U6-242, b.
CLOSE and LOCK RCDT Level Control Bypass 1-1901-U6-038, c.
OPEN RCDT Outlet Isolation 1-HV-7127, d.
OPEN RCDT Recirculation 1-HV-7144, OPed RCDT Pump Discharge Inside Containment c.
Isolation 1-HV-7699 by holding 1-HS-7699 in OPEN until 1-HV-7699 is fully open.
4.3.2 ENSURE CLOSED the following Loop Drain Valves:
a.
RC Loop 2 Drain Isolation 1-1201-U4-052, b.
RC Loop 2 Drain To RCDT Isolation 1-1201-U4-208, c.
RC Loop 3 Drain Isolation 1-1201-U4-030, d.
RC Loop 3 Drain To RCDT Isolation 1-1201-U4-209, e.
RC Loop 4 Drain Isolation 1-1201-U4-071, f.
RC Loop 4 Drain To RCDT Isolation 1-1201-U4-206.
4.3.3 CLOSE PRT Vent Valve 1-1201-U4-115.
4.3.4 CLOSE Pressurizer Spray Line Vent Valves 1-1201-X4-072 and 1-1201-X4-084.
4.3.5 ALIGN RCDT discharge to the Waste Holdup Tank as follows:
a.
OPEN RCDT To LWPS Isolation 1-1901-U6-040, b.
CLOSE Unit 1 RCDT Pump To Recycle Evaporator Feed Demineralizer Isolation 1-1901-U4-327.
4.3.6 START one RCDT Pumps a.
RCDT Pump fl.
1-HS-1003A, b.
RCDT Pump 12, 1-HS-1003B,
^~
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PRoCEDUHE No.
HEVIMoN PIobE~~~
VEGP 13005-1 10 22 of 28 O
4.3.7 ISOLATE the VCT from the Waste Gas Processing System as follows:
a.
ENSURE CLOSED 7 solation Valve Waste Gas Decay Shutdown Tank To VCT 1-1208-U4-352, b.
ENSURE CLOSED VCT TO GWPS ISO VLV 1-PV-0115, 4.3.8 VENT the RCS to atmosphere per Step 4.4.
4.4 OPENING THE RCS TO ATMOSPHERE NOTE l
The hoses used for venting should be routed to the l
Purge Ventilation System l
exhaust.
4.4.1 NOTIFY Maintenance to REMOVE the Blind Flange and install a venting hose at Pressurizer Safety Relief Header Vent 1-1201-U4-106, or to REMOVE p pe cap at Pressurizer Spray Line Vent Valve 1-1201-4-084 and j
INSTALL a Chicago Fitting and Venting Hose.
l 4.4.2 NOTIFY Maintenance to ramove the Blind Flange and l
install a venting hose at Reactor Vessel Head Vent l
System Vent Flow Gauge 1-FG-8099.
4.4.3 NOTIFY Maintenance to remove the Blind Flange and install a venting hose at Reactor Vessel Head Vent System Vent 1-1201-U4-086.
NOTE At the discretion of the USS, the Pressurizer (PRZR) Safety Loop Seal Drain Header Isolation 1-1201-U4-105 may be left open to vent the PRT until desired pressure in the PRT~is obtained, pcovided the N supply to the PRThasbeenr$turnedtonormal l
or isolated.
l 4.4.4 If Pressurizer Spray Line Vent Valve 1-1201-X4-084 is to be used for venting, CONTINUE with Step 4.4.5, otherwise, CLOSE Pressurizer Safety Loop Seal Drain Header Isolation 1-1201-U4-103, 4.4.5 OPEN Pressurizer Safety 1-PSV-8010A Loop Seal Drain
(
)
1-1201-U4-102.
l rw.s
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PROC [ DURE No.
RLVIStoN
' P A'0'L t f o.
VEGP 13005-1 10 23 of 28 t
O 4.4.6 To vent the pressurizer to atmosphere, OPEN Pressurizer Safety Relief Header Vent 1-1201-U4-106, or OPEN Pressurizer Spray Line Vent Valves 1-1201-X4-072 and 1-1201-X4-084.
4.4.7 VENT the Vessel Head to atmosphere as follows:
a.
ENSURE CLOSED Reactor Head Vents To Pressurizer Relief Tank 1-HV-0442A and 1-HV-0442B, b.
OPEN all Reactor Head Vent Isolations:
(1) 1-1208-U4-488, Isolation for 1-FG-8099, (2) 1-1208-U4-086, 2
e (3) 1-HV-8095A, (4) 1-HV-8096A, (5) 1-HV-8095B, (6) 1-HV-8096B.
5.0 REFERENCES
()
5.1 TECHNICAL SPECIFICATIONS 5.1.1 Technical Specification 3.4.1.4.1 5.1.2 Technical Specification 3.4.1.4.2 5.2 FSAR 5.2.1 Section 5.1 5.2.2 Section 5.2 5.2.3 Section 5.3 5.2.4 Section 5.4 5.3 PROCEDURES 5.3.1 13703-C,
" Boron Recycle System" 5.3.2 13214-1,
" Liquid Waste Processing System" l
5.3.3 13707-C,
" Auxiliary Gas System - Nitrogen" 5.3.4 13004-1
" Pressurizer Relief Tank Operation" O
5.3.5 13002-1,
" Reactor Coolant Drain Tank Operation" 103445
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l PHoCLDUHE Ho, REVISloN PAQ t N'o. ' ~
' ' ' ~
VECP 13005-1 10 24 of 28 5.3.6 13011-1
" Residual Heat Removal System"
()
i 5.3.7 12006-C,
" Unit Cooldown To cold shutdown" l
5.3.8 54840-1,
" Installation And Removal Instructions For The RCS Temporary Level Indication Tygon Tube And The Defeat Of The Residual Heat Removal Suction Valve Auto Closure Interlock" 5.3.9 23985-1, "RCS Temporary Water Level System" l
5.4 P&ID's 5.4.1 1X4DB111 Reactor Coolant System 5.4.2 1X4DB112 Reactor Coolant System 5.4.3 IX4DB114 Chemical And Volume Control System 5.4.4 1X4DB127 Waste Processing System - Liquid 5.5 ONE LINE DIAGRAMS 5.5.1 1X3D-AA-H01A 125V DC Class 1E Distribution l
Train A 5.5.2 1X3D-AA-H02A 125V DC Class 1E Distribution Train S 5.6 ELEMENTARY DIAGRAMS 5.6.1 1X3D-BD-B03F Reactor Coolant System 1-PV-0456A 5.6.2 1X3D-BD-B03H Reactor Coolant System 1-PV-0455A 5.6.3 1X3D-BD-B03R Reactor Coolant System 1-PV-0455B/04550 5.6.4 1X3D-BD-C05F CVCS 1-HV-8095B/8096B 5.6.5 1X3D-BD-C05G CVCS 1-HV-8095A/8096A 5,6.6 1X3D-BD-C65H CVCS-1-HV-0442A/0442B-END OF PROCEDURE TEXT O
4 701 4 %
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PHOCE DUHE NO.
F4EVISION PAGE NO.
VEGP 13005-1 10 25 Of 28 1
TABLE 1 COMPONENT NAME BKR NUMBER POSITION 11 RCP 1AAA RACKED OUT
- 4 RCP 1 DAD RACKED OUT PRESSURIZER HEATER PANEL INBPB1 1"b01-05 RACKED OUT PRESSURIZER HEATER PANEL INBPB2 INB10-05 RACKED OUT PRESSURIZER HEATER PANEL INBPB3 1NB09-12 RACKED OUT PRESSURIZER HEATER PANEL INBPC 1NB08-12 RACKED OUT O
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PHoCEDURE No-REVISloN PAGE No.
VEGP 13005-1 10 26 of 28 Sheet 1 of 3
(}
CHECKLIST 1
~
STEAM GENERATOR TUBE BUNDLE DRAINING INITIALS 1.0 Notify the Unit Shift Supervisor (USS) and install two 2000 psig nitrogen bottles with regulators to each Steam Generator Channel Head Drain Line Root Valve SG 1 1-1201-04-202 i
IV SG 2 1-1201-U4-203 IV SG 3 1-1201-04-204 SG 4 1-1201-U4-205 IV 2.0 Drain each Steam Generator one at a time by performing the following:
NOTE The order of draining Steam Generators and the decision for multiple draining is.at the USS discretion.
2.1 Cut in the nitrogen bottles and set the Nitrogen Regulator to approximately 15 psig.
O
PROCEDURE No REVISloN PAGE No.
VEGP 13005-1 10 27 of 28 Sheet 2 of 3
()
CHECKLIST 1
~
STEAM GENERATOR TUBE BUNDLE DRAINING INITIALS 2.2 Open the SG Channel Head Drain Isolation Root.
SG 1 1-1201-U4-202 SG 2 1-1201-04-203 SG 3 1-1201-U4-204 SG 4 1-1201-U4-205 2.3 Slowly open the SG Channel Head Drain Isolation.
SG 1 1-1201-U4-247 SG 2 1-1201-U4-248 SG 3 1-1201-U4-249 SG 4 1-1201-U4-250 NOTE Volume of the Steam Generator primary side is about 966 cubic feet.
2.4 When RCS level stops rising, isolate the nitrogen supply by closing the Channel i
Head Drain Isolation and Root Valves, i
2.5 Drain the RCS to restore level to l
Reactor Vessel Flange level (194 feet) per Step 4.1 of this procedure.
2.6 Repeat Steps 2.1 through 2.5 for the remaining Steam Generators.
O 70M45
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- +
enocEDURE No.
HEVISloN PAGE No.
VEGP 13005-1 10 28 of 28 i
Sheet 3 of 3
()
CHECKLIST 1 STEAM GENERATOR TUBE BUNDLE DRAINING NOTE If the SG Manways are to be opened, then leave hoses attached and route to floor drain.
INITIALS 3.0 Remove the nitrogen bottles and regulators from the Channel Head Drain Lines and notify the USS.
3.1 Verify Steam Generator Channel Head Drain Line Isolation-and-Root Valves closed, nitrogen bottles removed.
SG 1 1-1201-U4-202 1-1201-U4-247 SG 2 1-1201-04-203
/)
1-1201-U4-248 SG 3 1-1201-U4-204 1-1201-U4-249 SG 4 1-1201-U4-205 1-1201-U4-250 QU
-