ML20214K681
| ML20214K681 | |
| Person / Time | |
|---|---|
| Site: | Trojan File:Portland General Electric icon.png |
| Issue date: | 03/31/1986 |
| From: | WESTINGHOUSE OPERATING PLANTS OWNERS GROUP |
| To: | |
| Shared Package | |
| ML20214K679 | List: |
| References | |
| PROC-860331, NUDOCS 8608220059 | |
| Download: ML20214K681 (56) | |
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WESTINGHOUSE OWNERS GROUP
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SAFETY-RELATED MOV PROGRAM 1
J MA).CH 1986 A
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J 8608220039 860015 PDR ADOCK 0S000344 G
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4 SAFETY-RELATED MOV PROGRAM s
TABLE OF CONTENTS M
I.
INTRODUCTION 1
II.
PROGRAM OBJECTIVE 2
III. METHODOLOGY 3
A.
HIGH PRESSURE COOLANT INJECTION DEFINITION 3
B.
GENERAL HPI VALVE SELECTION 4
C.
AUXILIARY FEEDWATER SYSTEM (AFW) DEFINITION 5
D.
GENERAL AFW VALVE SELECTION 5
E.
FLUID SYSTEMS EVALUATION 6
F.
FLUID SYSTEMS EVALUATION - GENERAL CONCLUSIONS 8
G.
ERG SURVEY 9
H.
NORMAL OPERATION 10 l
IV. APPLICATION TO SNUPPS 11 A.
HPI VALVE SELECTION APPLIED TO SNUPPS j) 8.
AFW VALVE SELECTION APPLIED TO SNUPPS 11 C.
FLUIO SYSTEMS EVALUATION APPLIED TO SNUPPS 11 l
D.
LICENSING BASES FOR SNUPPS 13 l
V.
GENERAL APPLICATION 14 i
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4 WOG SAFETY-RELATED MOV PROGRAM 1.
INTRODUCTION
-t On November 15, 1985, the NRC Office of Inspection and Enforcement issued IE Bulletin 85-03: " Motor-0perated' Valve Comon Mode Failures During Plant Transients Due to improper Switch Settings". The purpose of the bulletin was'to " request licensees to develop and implenent a program to ensure that switch settings on certain safety-related motor-operated valves are selected, set, and maintaine'd correctly to accommodate the maximum differential pressures expected!.on these valves during both normal and abnormal events within the design basis".
1 The bulletin originates, in part, from the Davis-Besse event of June 9, 1985 (described in NUREG-1154). During this event, normally open, auxiliary feedwater isolation MOVs failed to re-open on demand from the main control room after being closed during the event (as a result of an operator error to correctly actuate the Steam and Feed Rupture Control System). These isolation valves operated properly under low differential pressures,butfailedduringtheeventunderhighdifferentialpre$sures.
The root cause of the MOV failures was an improper setting of the torque bypass switch in each valve's control circuit. Hence,,the NRC's concern is that motor operator switches be set for the highest differential pressure condition consistent with the valve design basis. The failure occurred on both AFW isolation valves. As such, this failure was in itself enough to completely defeat the /.FW system (comon mode failure).
Bulletin 85-03 (IEB 85-03) focuses on the MOVs in two systems; the high pressure coolant injection system and emergency feedwater system.
IEB 85-03 contains six actions, brief1s/ summarized here:
(IEBBS-03 should be consulted for a more comprehensive description of the bulletin actions.)
(a) Determine the maximum differential pressure across the subject MOVs.
Document the valve design basis..
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(b) Using the differential pressures from (a), establish to motor operator switch settings.
(This requires other parameters in addition to maximum differential pressures.)
(c) Dem5nstrate the valve's operability by testing the valve at maximum differential conditions - if feasible or unless an alternative can be
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justified.
(d) Revise the switch setting procedures.
(e) Submit a written report documenting (a) and containing a program schedule to address (b) through (d).
(f) Submit a final report upon program completion.
II. PROGRAM OBJECTIVE The objective of this program is to provide a methodoloav to WOG utilities for determining maximum fluid dif ferential pressures across the bulletin specified MOVs. This corresponds only to part of action (a) of Bulletin 85-03. To complete action (a), WOG utilities must review and documer* the design basis for the bulletin specified MOVs, and use the methodology described herein (or some other means) to determine the maximum differential pressure for each MOV (part of the design basis).
Action (a) does not request licensees to determine the entire set of parameters necessary for correctly setting the motor-operator switches.
This is action (b) of IEB 85-03.
Before action (b) can be completed, additional parameters (to fluid maximum differential pressure) must be determined, such as:
Valve internal friction losses (packing, seat friction, etc.)
Valve supplied voltage (accident conditions may be 80% of normal conditions - this is significantly less available power) 2 of 28 1226n:3/ TAR /3-86
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Q Valve bonnet pressure Line static pressure All of these parameters will affect the thrust forces the valve,must develop to open and close, and therefore will impact the motor-operator
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switch settings. Note that the determination of these types of valve parameters will become more important for cases where it is not feasible to test at maximum differential pressure.
III.
METHODOLOGY A.
Hioh Pressure Coolant Iniection Definition Depending on plant design, high pressure coolant injection (HPI) may be accomplished using portions of the Chemical and Volume Control System (CVCS) and the High Head Safety Injection System (HHSI).
Consequently, it is necessary to clearly separate the HPI portions of these systems from the non-HPI portions.
For this program, "high pressure coolant" injection is defined as:
1.
Those portions of the Safety Injection System (or Emergency Core Ccoling System) down to/and not including the Accumulator Injection System.
In general, this includes portions of the CVCS and/or the HHSI (RHR is NOT included and accumulator injection is not included.)
2.
Those portions of the above defined HPI systems necessary to establish a flowpath(s) from the RWST to the RCS.
4 3.
Only those portions of the HPI (as defined above) required during the safety injection phase, up to/NOT INCLUDING the manual on partial auto transfer to recirculation from the containment sump after the RWST empties. Therefore, recirculation modes of operation (long term cold leg recirculation and hot leg recirculation) are not included in the definition of HPI since these modes of operation require the functioning of the RHR system, which has been excluded from the HPI definition (above).
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4 B.
General HPI Valve Selection The HPI motor-operated valves (MOVs) were selected based on their function within the HPI system (defined above).
In general, there gre three functions required to establish high pressure coolant flow to the RCS.
B.1. The normal CVCS flowpath to the RCS is isolated:
8.1.1 Isolate nornal CVCS suction from the VCT.
B.1.2 Isolate nornal CVCS discharge to the RCS.
B.2. The SI flowpath(s) is established from the RWST to the RCS.
There are two possible flowpaths.
B.2.1 RWST to centrifugal charging pumps (CCP) to RCS.
B.2.2 RWST to HHSI pumps to RCS.
B.3. Pump miniflow MOVs should be correctly positioned to assure proper pump operation and required design flow.
B.3.1 CCP miniflow.
B.3.2 HHSI pump miniflow.
Several plants do not use the CVCS/ centrifugal charging pumps as part of their high pressure coolant injection system. Therefore, references to CVCS/ centrifugal charging would not apply.
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C.
Auxiliary Feedwater System ( AFW) Definition In general, the AFW system (or Emergency Feedwater System for some plants) is a separate and independent system which therefore requires no special definition to establish the system bodndaries.
The AFW provides a reliable source of feedwater to the steam generators, in the event main feedwater is either lost or isolated.
However, for the purposes of this program, a " hybrid" AFW system is being defined. This " hybrid" AFW system is based on the SNUPPS AFW design, but is modified to include several " hypothetical"'MOV locations. The intent is to make AFW AP methodology genteically applicable to as many AFW designs as possible. By consifering these additional " hypothetical" locations, more possible situations (for MOV locations) are addressed.
D.
General AFW Valve Selection All MOVs within the AFW system should be included on the list of valves to be examined for maximum differential pressure. Generally, AFW MOVs function to:
0.1 Establish a flowpath(s) from the AFW safety grade water source (or its backup) to the steam generators.
l 0.2 Establish a steam delivery flowpath to the AFW turbine to enable the turbine-driven AFW pump to start.
4 D.3 Regulate (or isolate) AFW pump miniflow to assure proper pump performance and delivered design flow.
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. 4 E.
Fluid Systems Evaluation The fluid systems evaluation determined the maximum operating, open/close APs, for the selected MOVs given system configuration, equipment capability, and design operating modes.
It is important to note that the HPI system was defined based on the requirement of establishing a high pressure injection flowpath from the RWST to RCS for short term, high pressure, cold leg injection.
Subsequently, the HPI MOVs were selected based on their required functioning in establishing this high pressure injection flowpath.
However, once the HPI system was defined, and MOVs selected, a different set of criteria was used to perform the Fluid System evaluation.
For the HPI MOVs selected, all modes of operation were evaluated including recirculation modes. This was to ensure that for this given set of MOVs, the worst case operating AP was determined, since some of the HPI MOVs (in the suction to the HHSI pumps and centrifugal charging pumps) are exposed to more bounding fluid conditions for these recirculation modes.
Note that the AFW system can also operate in the long term mode.
Two different sets of single failure criteria were used for the fluid systems evaluation depending on whether short term operating l
modes or long term operating modes are being considered.
l 1.
Short-term operation - Single active failures were considered.
Passive failures were not assumed. This means that gross check valve backleakage was not assumed (requires a passive failure of the check valve).
2.
Lona-term operation - Both active and passive failures were considered credible. The analysis was based on a single failure which was found to be the worse of either the active or passive failures.
1226n:3/ TAR /3-86
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In general, the fluid systems evaluation was the detertnination of a maximum operating AP, for any system operating mode and design basis event. Hence, these maximum operating' APs are a relaxation of the conservative MOV equipment specification (E-Spec),aP.
(E-Spec AP > Max. Oper. AP). For testing purposes [IE8 85-03 action (c)], this maximum operating AP is more realistic and feasible.
The maximum operating AP represents the maximum pressure producing capability of the system equipment for the system operating modes.
Within the given system, the following equipment and system configuration information is important to the determination of maximum operating AP:
1.
Pumps-Operating /not operating, operation configuration (miniflow/no miniflow),
maximum discharge head.
2.
Relief Valves -
Setpoint limits system pressure.
3.
Piping Losses and Elevation Changes 4.
No gross backleakage.
5.
Tanks -
Elevation. head, design pressure
- 6..
Other MOVs -
Position (0 pen /close)
Outside the system, the following information is important to AP:
1.
RCS Pressure -
For HPI system 2.
S.G. Fressure -
For AFW system Given the above information, maximum operating MOV dif ferential pressures were developed for both open and close operations.
For each AP a justification is given based on system configuration and equipment constraints.
Finally, these maximum operating dif ferential pressures were compared against the valve design specification AP to verify adequate design.
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F.
Fluid Systems Evaluation - General Conclusions There are four general locations for a motor-operated valve within the HPI and AFW systems:
1.
Suction of AFW and HPI pumps 2.
Discharge of AFW and HPI pumps 3.
Miniflow line of AFW and HPI pumps 4.
Steam supply line to turbine-drivea AFW pump For MOVs in location 1 (suction of pumps), the maximum open and close APs are generally determined by:
1.
Supply tank static elevation head.
(Tank static elevation head upstream of MOV, 0 pressure downstream)
Supply pump maximum discharge head.
(Maximum supply pump discharge head upstream of MOV, 0 pressure downstream)
Example is service water p wps.
3.
HPI suction valves, (for long-term recirculation) - maximum discharge head of RHR purtps.
(Reverse flow - RHR pump maximum discharge head dowrstream of MOV, 0 pressure on upstream side
- normal flow is from RWST to RCS) j For MOVs in location 2 (discharge 'of pumps), the maximum open and close APs are generally determined by:
1.
Maximum discharge head of pump.
(Maximum pump discharge head upstream of MOV, O pressure downstream for either RCS or SG)
Examples are maximum head of charging pumps, maximum head of turbine-driven AFW pumps adjusted to account for maximum overspeed.
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For MOVs-in location 3 (miniflow of pumps), the maximum open and close APs are generally determined by:
t 1.
Pump maximum head at miniflow.
(Pump maximum head at miniflow upstream of MOV, O pressure downstream)
For MOVs in location 4 (steam supply to turbine of turbine-driven AFW pump), the maximum open and close APs are generally determined by:
2.
Maximum steam generator supply pressure - lowest steam generator safety valve setpoint plus 3% accumulation.
(SG steam pressure upstream of MOV, O pressure downstream)
The above conclusions are intended as general guidance only. The plant specific configuration and possible system operating modes s it_ be examined carefully to determine the applicability of these general conclusions.
G.
ERG Survey The ERG survey determined when the selected MOVs (HP1 MOVs - Table 1 and AFW MOVs - Table 2) are required to function for emergency j
operacion.
In addition, the survey identified other important characteristics of the system operation (pump on/off) which impact the MOVs capability to function. Therefore, the ERG survey provided a check of current ERG operations (involving these MOVs) against the original fluid systems design assumptions for MOV operating modes.
(The' ERG surveys are provided in Appendix A&B.)
For each MOV, the ERG survey generated a list of ERG steps where either the given MOV is moved, or its proper alignment verified.
Many of the steps on this list were repetitive, therefore, the list was consolidated to a few general cases for each valve.
Each general case gives the ERG operation (e.g., SI alignment), the required MOV operation (open or close), and the equipment operating (pumps) during the operation. Two general cases were important for confirmation of the fluid systems operating assumptions:
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'1.
Open/close MOV with pumps 2n.
2.
Open/close MOV with pumps off.
t The ERG operation general cases were checked against the' fluid systems assumptions.
If the ERGS and the fluid system assumptions are consistent. then a yes appears in the " ERG Confirmation" column of Tables 3 and 4.
It should be noted that Table 3 reveals two inconsistencies with the BIT isolation MOVs. These inconsistencies are further discussed in the footnote to Table 3.
H.
Norwal Operation The AFW and HPI systems generally function during off-normal situations where either auxiliary feedwater is needed (main feed is lost or tripped) or safety injection flow is required. However, these two systems also have nornal operative functions. Since part of the CVCS functions for HPI (in SNUPPS design), it is necessary to isolate the nornal charging path to the RCS, prior-to establishing the safety injection path. This is accomplished by isolating the nornal CVCS suction from the VCT and the normal CVCS discharge to i
the RCS. The maximum operating APs determined for the normal CVCS i
suction and discharge MOVs, bound any pressure differential condition which may be encountered during norral operation.
Specifically, l
The VCT suction MOVs have a maximum AP limited by VCT design pressure plus elevation head.
The nornal CVCS discharge MOVs have a maximum AP limited by the maximum discharge head of the centrifugal l
charging pumps (accounting for any suction boost from the VCT).
The AFW system has nornal operative functior.s during startup, shutdown and hot standby conditions. However, all these normal AFW system operations are bounded by off-normal accident scenarios.
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IV. APPLICATION TO SNUPPS A.
HPI Valve Selection ADD 11ed to SNUPPS t
Usi69 the selection criteria defined in III.B., the HPI valve list was generated for SNUPPS, and is shown in Table 1.
The table lists the MOVs by function and by SNUPPS valve number.
In addition, valve position information is given, and which functional selection criteria the valve meets to be included on the list (either B.1.1, 8.1.2, B.2.1, B.2.2, B.3.1, 8.3.2 as defined in the " General HPI Valve Selection" section III.B.).
To further illustrate how these valves meet the selection criteria, simplified line diagrams of the SNUPPS HPI system are shown in Fig.1-1 through 1-3.
The figures illustrate the valve locations within the SNUPPS HPI system (as defined for this program).
8.
AFW Valve Selection ADD 11ed to SNUPPS Using the selection criteria defined above, the AFW valve list was generated for the SNUPPS " Hybrid" AFW system and is shown in Tatie 2.
The table lists the actual SNUPPS MOVs as well as the hypothetical M07s.
In addition, valve position information is given i
and which function the MOV providas.
(0.1, D.2, or D.3 as given in i
" General AFW Valve Selection" section III.D.)
To further illustrate where these AFW MOVs are located, simplified line diagrams are shown in Figures 2-1 and 2-2 C.
Fluid Systems Evaluation Applied to SNUPPS f
The application of the fluid systems evaluation to the HPI and AFW systems is shown in Tables 3 and 4 respectively. The tables give the following information:
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SNUPPS valve nun.ber 2.
Valve function 3.
Valve location f
4, Design E-Spec AP (HPI only) 5.
' Maximum operating AP (HPI only) 6.
Justification for maximum operating AP 7.
ERG Confirmation of operating assumptions Following Tables 3 and 4 are the applicable justifications and footnotes.
The. maximum operating AP is a relaxation of the design (E-Spec)
AP, based on the justification provided (for AfW, APs could not be provided as explained in footnotes 1 & 2 to Table 4). The original fluid systems design makes operating mode assumptions in order to determine APs for each MOV. The ERG confirmation is a check that the current ERG guidelines are consistent with the fluid systems operating assumptions.
If a yes appears in the " ERG Confirmation" column, then the worst cases ERG operation is consistent with the fluid system design assumption (for AFW, Westinghouse did not design the system. The justifications provided for the AFW APs are conservative. The ERGS are consistent with these conservative criteria. See also footnotes 1, 2, & 3 to Table 4).
Table 3 reveals two inconsistencies between the ERGS and the fluid systems design. Footnote 1 to Table 3 contains an explanation for these two cases.
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Appendix C centains the SNUPPS FSAR drawings which can be consulted
.for a further understanding of the fluid systems justification.
D.
Licensina Bases for SNUPPS Chspters 15,'10 and 6 of the SNUPPS FSAR were reviewed to identify any licensing commitments pertinent to the MOV effort.
Specifically, the objective of the FSAR review was to identify what automatic MOV operations are required to establish auxiliary feedwater and safety injection flow.
For safety injection flow, the following motor-operated valves automatically move:
1.
LCV-1120&E open (RWST Suction Valves to Charging Pumps) 2.
LCV-1128&C close (CVCS Suction Valves from VCT) 3.
HV-8105/8106 close (CVCS Nornal Discharge Valves) 4.
HV-8803A&B Open (BIT Isolation Valves)
HV-8801A&B For auxiliary feedwater flow, the following motor-operated valves automatically move:
1.
To establish nornal AFW flow from motor-driven pumps, no valves are required to move.
2.
If the turbine-driven AFW flow is required, HV-312 (Mech. Trip and Throttle Valves) must open.
(Note: Steam admitting valves are air-operated.)
3.
If the CST water supply fails, HV-30, 31, 32, 33 automatically open (low suction pressure), and HV-34, 35, 36 automatically close.
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i V.
GENERAL APPLICATION To apply the methodology discussed in this report requires:
Select MOVs based on system definitions and MOV functions within those systems (sections III.A.,
B., C., D. and IV.A.
& B.)
Fluid Systems Evaluation review MOV design E-Specs to obtain limiting design APs.
examine plant specific system configuration and system operating modes, to determine the applicability of the general fluid system conclusions for relaxation of maximum design APs for operating conditions. Also, review application to SNUPPS (sections III.E., F. and IV.C.)
Review Plant Specific E0Ps ERG surveys are general examples of the type of information important to MOV APs (sections III.G.,
Appendix A & B)
Review System / Component Licensing Basis Identify pertinent licensing commitments relative to the selected MOVs (section IV.O. is an example)
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TABLE 1.
SNUPPS HPI VALVES SNUPPS VALVE POSITION OR (Required
_3py_
NUMBER RE-POSITION for CL Inj.)
- FUNCTION Safety Inj.
8806 A&B Normally Open B.2.2 Pump Suction (no auto signal req.)
from RWST Safety Inj.
8923 A&B Normally Open B.2.2 Pump Suction (no auto signal req.)
from RWST CVCS Pump LCV-112 D&E Nornelly Closed -
B.2.1 Suction from Opens on "S" signal 4
RWST CVCS Pump LCV-112 B&C Normally Open B.1.1 Suction from Closes on "S" signal if
- VCT LCV-112 D&E Open SI Pump 8821 A&B Norum11y Open B.2.2 Cross-Connect (no auto. signal req.)
SI Pump 8835 Normally Open B.2.2 Disch. Isol.
-power locked out (no auto, signal req.
CVCS Normal 8105 Nornelly Open B.l.2 Disch. 1501.
8106 Closes on "S" signal BIT Inlet-8803 A&B Normally Closed B.2.1 Isolation Opens on "S" signal Bit Outlet 8801 A&B Normally Closed B.2.1 Isolation Opens on "S" signal SI Pump 8813 Nornelly Open B.3.2 Mini Flow 8814 A&B (No auto, signal req.)
Charging Pump 8110 Normally Open B.3.1 Mini Flow 8111 Closes on SIS
- See " General HPI Valve Selection" section for an explanation of " function" 1226n:3/ TAR /3-86 15 of 28
TABLE 2.
AFW VALVES SNUPPS VALVE POSITION OR (Required MOV NUMBER RE-POSITION for CL Inj.)
- FUNCTION Motor-Driven" HV-5,7,9,11 Nornelly Open D.1 Pump Disch.
(auto. oper. to control M.D.
Flow Control Valves-pump runout)
Mech. Trip HV-312 Nornelly Closed 0.2 and Throttle Opens on Auto. Start-Signal Valve (2/4 10/10 levels in 2 SGs (Steam supply to or loss of offsite power) turbine-driven pump)
Suction from HV-34,35,36 Nornelly Open D.1 CST - All pumps (closes on low suct. press.)
Suction from HV-30,31,32,33 Normally Closed 0.1 Essential Service (0 pens on low suct. press.)
Water HYPOTHETICAL MOVs COMMENTS Turbine-Driven Pump
- These are air-operated valves on SNUPPS D.1 Disch. Flow Control Valves Discharge Isolation
- No equivalent, remotely operated D.1 Valves valve Steam Admitting Valve
- These are air-operated valves on SNUPPS D.1 Motor Driven Pump X-Connect - No equivalent remotely opertted valve 0.2 Pump Mini Flow
- No equivalent remotely operated valve D.3
l TABLE 3
Maximum ERG
)
Design Operating Justification %
Confimation.
SNUPPS LE-SPEC) AP aP for Max of Operating MOV Valve Number Close Open Close Open Operating _aP Assumptions Safety Injection 8806 A&B 200 200 200 50 Open - 2 Yes e
i Pump Suction Close - 1 4
from RWST l
Safety Injection 8923 A&B 200 200 200-50 Open - 2 Yes Pump Suction Close - 3 from RWST CVCS Pump Suction LCV-112 D&E 200 200 200 50 Open - 4 Yes from RWST Close - 4 CVCS Pump Suction LCV-112 B&C 100 200 100 100 Open - 5
'Yes from VCT Close - 5 t
j g
St Pump 8821 A&B 1500 1500 1500 1500-Open - 15 Yes I
Cross-Connect Close - 14 l
Ifoo SI Pump Discharge 8835 0
2750 0
-H59-Open - 7 Yes Isolation Close - 6 CVCS Normal 8105 2750 2750 2750 2750 Open Yes j
Discharge 8106 Close - 8 l
Isolation l
BIT Inlet 8803 A&B 0
2750 0
2750 Open - 9 No - Not Consistent l
Isolation Close - 6 for MOV Closure l
(See Table 3 Footnote 1) l BIT Outlet 8801 A&B 0
2750 0
2750 Open - 9 No - Not Consistent-Isolation Close - 6 for MOV Closure l
(See Table 3 Footnote.1)
SI Pump Miniflow 8813 2750 2750 1750 1750 Open - 11 Yes 8814 A&B Close ~10 CVCS Pump 8110 2750 2750 2750 2750 Open - 13 Yes Miniflow Bill Close
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FOOTNOTE TO TABLE 3 0
1.
TheERGguidelinestoterminatesafetyinjection(isolatetheBIT)ingand return to nornal charging are performed with the centrifugal charg pumps operating. This termination method reduces net RCS e.akeup in a controlled manner and maintains continuous reactor coolant pump seal injection. Since the charging pumps are operating, the BIT isolation valves must close against a AP.
This AP could be large for some SI termination scenarios (RCS could be as low as 200 psi - AP could be as high as 2500 psi). Utilities should check their BIT isolation valve E-Specs to determine the valve closure capability. In addition, utilities should check their E0Ps to determine if the valve closure capability is consistent with the intended operation of the valves.
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.1USTIFICATION FOR TABLE 3 i
1.
This valve must be able to close to isolate the RWST from the discharge of the RHR p6mps during the recirculation mode of operation, as a,
precautionary measure in the event of backleakage through check' valve 8926A (gr B).
For this scenario, the AP across 8806A (or 8) could be as high as the RHR pump discharge head ~200 psig.
2.
This valve is normally open, and is closed only for stroke testing and/or pump isolation for maintenance. The valve must be able to open against a full RWST head of water. For SNUPPS, this is ~50 psig.
3.
This valve must be capable of isolating (closing) one high head safety injection pump, given a passive failure in that train of ECCS. Fcr this scenario, the AP across 8923A, 8 could be as high as the RHR pump discharge head ~200 psig.
4.
Same as 8806A, B (for both close and open), except-these valves are in the suction of the centrifugal charging numps and not the high head safety injection pumps.
5.
These valves must close on an
'S' signal; the maximum AP across the valve is defined by the volume control tank at its design pressure (relief valve setpoint) of 75 psig plus elevation head of the VCT above the velves. This is estimated to be ~100 psig.
6.
Valve is only closed when pump is not operating; no flow - no AP, 7.
Pump testing on miniflow circuit, AP is determined by the miniflow head of high head safety injection pump ~1750 psig.
8.
These valves must be able to isolate the RCS frcm the CVCS, with a maximum possible AP of - the shutoff head of the centrifugal charging pumps.
9.
Given a miniflow test of the centrifugal charging pumps, the BIT isolation valves must t,e able to open with a AP ~ equal to the charging pump shutoff head.
- 10. Valves must close to isolate miniflow so that high pressure injection switchover to recirculation may proceed.
In the worst case, the AP will be equal to the pump developed head on miniflow ~1750 psig.
- 11. Similar to 10, except valve must be able to open during miniflow testing of the high head safety injection pump.
- 12. Valves must close to ensure adequate high pressure injection flow (on "S" signal) against miniflow AP - 2750 psig.
- 13. Similar to 12, except valve must be able to open during miniflow testing.
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- 14. Must be able to move to allow realignment of ECCS to recirculation mode, and for ECCS train separation. Delta-P could be as high as 1500 psig -
equal to miniflow head of high head safety injection pump.
- 15. Must be able to open to allow train separation during the recirculation phase of ECCS operation.
Delta-P same as closing.
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TABLE 4 AFW VALVE APs Maximum ERG Design Operating Justification Confirmation SMUPPS (E-SPEC) AP AP for Max of Operating MOV Valve Number Close Open Close Open Operating AP Assumptions Motor-Driven HV-5, 7, g, 11 (See Table 4 (See Table 4 open - 1 Yes - (See Table 4* Footnote 3 Pump Discharge Footnote 1)
Footnote 2)
Close - 1 for all cases)
Flow Controi Mechanical Trip HV-312 Open - 2 Yes and Throttle Close - 2 Suction from HV-34, 35, 36 Open - 3
'Yes CST - All Pumps Close - 3 4
j m Suction from HV-30, 31, 32, 33 Open - 4 Yes
~ Essential Close - 4.
R Ssrvice Water
" Turbine-Driven Hypothetical Open - 5 Yes l
(
Pump Discharge Close - 5 Flow Control Discharge Hypothetical Open - 1 or 5 Yes l
Isolation Close - 1 or 5 Steam Admitting Hypothetical Open - 2 Yes l
Valve Close - 2 Motor-Driven Pump Hypothetical Open - 1 Yes Cross-Connect Close - 1 Pump Miniflow Hypothetical Open - 1 or 5 Yes Close 1 or 5 l
4 1
l
FOOTNOTES TO TABLE 4 1.
Design E-Spec information for SNUPPS AFW system was not available to Westinghouse. Utilities should consult their AFW system valve E-Specs for this infornation.
,t 2.
A relaxation from the E-Spec AP to determine maximum operating AP could not be performed by Westinghouse. Utilities should consult the system designer (Architect Engineer) to determine these APs.
3.
The ERGS are consistent with the conservative criteria specified for determining maximum operating AP.
However, the system designer (Architect Engineer) could relax the criteria for specifying maximum operating AP.
In this case, the ERGS (or plant specific EDPs) should be consulted to verify these fluid system assumptions (on which the criteria are based).
l l
1167n:78/ TAR /3-86 22 of 28
JUSTIFICATIONS FOR TABLE 4 1.
Motor driven pump discharge head at miniflow.
2.
Lowest steam generator safety valve set pressure plus 3 percenD accumulption.
3.
Static elevation head of the condensate storage tank.
4.
Discharge head of the service water pumps at miniflow.
5.
Discharge head of the turbine-driven pump at miniflow, adjusted to account for the maximum pump overspeed condition during startup.
1167n:78/ TAR /3-86 23 or 28
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./
ERG SURVEY"'
o SAFETY RELATED MOV PROGRAM H.P.I. VALVES
?
APPENDIX A l
t i
l l
1167n:78/ TAR /3-86 l
i
8806 A&B S1 Pump Suction Valves from RWST 8923 A&B t
E-0. Step 18 ECA-0.2, Stip 2 ECA-1.1, Step 11 Case 1:
Verify SI alignment FR-C.1, Step 1 FR-C.2, Step 1 FR-M.1, Step 11 ES-1.3 Case 2:
Cold leg recirculation 4
Conditions Case 1:
Open valves against RWST tank conditions Case 2:
Close valves with pumps running I
1167n:18/ TAR /3-86 l
l'
LCV-112 D&E CVCS Suction Valves from RWST LCV-112 B&C CVCS Suction Valves from VCT
~
ES-0.1, Step 4 ES-1.1, Step 15 E-3, Step 28 ECA-0.1, Step 3 ECA-2.1, Step 26 ECA-3.3, Step 14 Case 1:
Align charging /SI pump suction to VCT FR-S.1, Step 4 FR-H.1, Step 11 FR-P.1 Step 19 ES-1.3 Case 2:
Cold leg recirculation (112 D&E only)
Conditions Case 1:
Close and open valves against tank conditions (RWST & VCT)
Case,2:
Close valves (112 D&E) against RWST conditions l
1167n:78/ TAR /3-86
8105, 8106 CVCS Discharge Isolation Valves b
E-0. Step 18
~
FR-C.1, Stop 1 Case 1:
Verify SI alignment FA-C.2, Step 1 ES-1.1, Step 6 ES-1.2, Step 16 E-3, Step 22 ECA-0.1, Step 4 ECA-2.1, Step 15 ECA-3.1, Step 20 ECA-3.2, Step 9 Case 2:
Establish charging flow FR-S.1, Step 4 FR-H.1, Step 25 FR-P.1, Step 10 FR-1.1, Step 2 FR-I.2, Step 3 FR-I.3, Step 2 Conditions Case 1:
Close valves with charging pumps running Case 2:
Open valves with charging pumps running l
l l
1167n:78/ TAR /3-86
i 8835 SI Pump to Cold Leg Isolation Valve E-0, Step la FR-C.1, Step 1 Case 1:
Verify SI alignment Fi-C.2 Step 1 ES-1.4 Case 2:
Hot leg recirculation Condition Case 1:
Open valves with SI pumps running Case 2:
Close valves (pump off) i I
(
-7 l
i i
1167n:78/ TAR /3-86 t
i
l 8803 A&G BIT Suction Isolation Valves 8801 A&B BIT Discharge Isolation Valves
- t FS-1.1, Step 7 E5-1.2, Step 9 E5-1.2, Step 17 E-3, Step 23 ECA-2.1, Step 16 ECA-3.1, Step 21 Case 1:
Isolate SIT ECA-3.2, Step 15 ECA-3.3, Step 4 ECA-3.3, Step 10 FR-H.1, Step 26 FR-P.1, Step 11 E-0. Step 18 FR-C.1, Step 1 Case 2:
SI alignment - Open val.ves FR-C.2, Step 1 Conditions J
Case 1:
Close valves with charging pump running Case 2:
Open valves with charging pump running I
i l
1167n:78/ TAR /3-86 c
8813, 8814 A&B $1 Pump Miniflow Valves E-0. Step it
-,. t FS-C.1, Step 1 Case 1:
Verify SI alignment FS-C.2, Step 1
$-1.3 Case 2:
-Cold leg recirculation Conditions Case 1:
Open valves with SI pump running Case 2:
Close valves with SI pump running 1167n:18/ TAR /3-86
9 8821 A&B SI Pump Cross Connect Valves E-0, Step 18
{'
FR-C.1, Step 1 Case 1:
Verify SI alignment FR-C.2, Step 1 E5-1.4 Case 2:
Hot leg recirculation Conditions Case 1:
Open valves with pumps running Case 2:
Close valves with pumps running (SI pumps off) l l
l l
i 1167n:78/ TAR /3-86 l
- - - - - ~ '
~
^~-
~~
~~
8110, 8111 Charging Pump Miniflow Isolation Valves
.:s Valves are not repositioned in ERGS.
l FErplantswithminiflowisolationonSI,valveswouldhavetoclosewith pDmps running.
1167n:78/ TAR /3-86
.,- t I
ERG SURVEY s
SAFETY RELATED MOV PROGRAM AFW VALVES APPENDIX B 1167n:18/ TAR /3-86
^
5, 7, 9, 11 M0 AFW Pump Discharge Valves o
Hypothetical Motor Operated Discharge Isolation Valves.
Hypothetical Motor Operated Cross Connect Valves E-2, Step 4 i
ECA-0.0, Step 11 FR-5.1, Step 11 FI-H.2, Step 6 Case 1:
Isolate AFW flow FA-H.3, Step 3 FR-2.1, Step 6 E-0, Step 17 ECA-0.0, Step 4 Case 2:
Verify AFW valve alignment FR-S.1, Step 6 ES-0.2, Step 6 4
E-1, Step 3 ES-1.1, Step 20 ES-1.2 Step 6 E-3, Step 7 ES-3.1, Step 4 ES-3.2, Step 4 ES-3.3, Step 4 Case 3:
Control AFW flow ECA-0.1, Step 7 ECA-0.2, Step 6 ECA-3.1, Step 9 ECA-3.3, Step 5 FR-C.1, Step 9 FR-C.2, Step 9 FR-H.3, Step 4 Conditions Case 1:
Close valves with pumps running l
Case 2:
Open valves with pumps running Case 3:
Maximum AP experienced at full open or full closed position with pumps running 1167n:78/ TAR /3-86 l
l
f 34, 35, 36 AFW Suction Valves from CST
.t E-0, Step 17 ECA-0.0, Stip 4 Case 1:
Valve alignment a
FA-S.1, Step 6 E'b-0.2 Step 6 Caution E-1. Step 3 Caution ES-1.1, Step 20 Caution ES-1.2, Step 6 Caution E-3, Step 7 Caution ES-3.1, Step 4 Caution ES-3.2, Step 4 Caution ES-3.3, Step 4 Caution Case 2:
Switchover to alternate sources Foldout pages ECA-0.1, Step 7 Caution ECA-0.2, Step 6 Caution ECA-3.1, Step 9 Caution ECA-3.3, Step 5 Caution FR-C.1, Step 9 Caution FR-C.2, Step 9 Caution Conditions Case 1:
Open valves against CST conditions Case 2:
Close valves against CST conditions i
i i
1167n:78/ TAR /3-86
30, 31, 32 AFW Suction Valves from ESW
=t EdD, Step 17 ECA-0.0, Step 4 Case 1:
Verify AFW valve alignment FR-5.1, Step 6 ES-0.2. Step 6 Caution E-1. Step 3 Caution ES-1.1, Step 20 Caution ES-1.2, Step 6 Caution E-3, Step 7 Caution ES-3.1, Step 4 Caution ES-3.2, Step 4 Caution ES-3.3, Step 4 Caution Case 2:
Alternate water sources Foldout pages ECA-0.1, Step 7 Caution ECA-0.2 Step 6 Caution ECA-3.1, Step 9 Caution ECA-3.3, Step 5 Caution FR-C.1, Step 9 Caution FR-C.2, Step 9 Caution Conditions Case 1:
Close valves against ESW source Case 2:
Open valves against ESW source I
i 1
1167n:78/ TAR /3-86
\\
i 6, 8, 10, 12 TDAFW discharge Isolation Valves
.t
~
E-0, Step 17 EGA-0.0, Step 4 Case 1:
AFW valve alignment I
FR-s.1, Step 6 I
E 2, Step 4 ECA-0.0, Step 11 FR-S.1, Step 11 FR-H.2, Step 6 Case 2:
Isolate AFW flow FR-H.3, Step 3 FR-2.1, Step 6 ECA-0.0, Step 13 ECA.1, Step 7 Conditions Case 1:
Open valves with pumps running Case 2:
Close valves with pumps running i
5 t
. 1167n:78/ TAR /3-86 i
312 - Turbine Trip and Throttle Valve
.t ES-0.2, Step,6 Ell, Step 3 ES-1.1, Step 20 ES-1.2 Step 6 E-3, Step 7 ES-3.1, Step 4 ES-3.2, Step 4 ES-3.3, Step 4 Case 1:
Control TO AFW flow ECA-0.6. Step 7 ECA-0.2 Step 6 ECA-3.1, Step 9 ECA-3.3, Step 5 FR-C.1, Step 9 FR-C.2, Step 9 FR-H.3, Step 4 Conditions t
Case 1:
Open and close4 valves against steam pressure.
(Lowest safety valve setpoint + 35 accumulation) 1167n:78/ TAR /3-86
5, 6, 48, 49 - Steam Supply Valves to TDAFW Pump E-2, Step 4 -
ECA-0.0, Step 11 FR-S.1, Step 11 FR-H.2, Step 6 Case 1:
Isolate AFW flow FR-H.3, Step 3 FR-Z.1,' Step 6 ECA-0.0, Step 13 ECA-0.1, Step 7 E.0, Step 5 FR-H.2, Step 4 Case 2:
Establish AFW flow Conditions Case 1:
Close valves against steam pressure Case 2:
Open valves against steam pressure 4
I 1
l 1167n:*/8/ TAR /3-86 L
9 Hypothetical Motor Operated Miniflow Valves t
Valves would be required to open or close with pumps running.
4 I
i i
1167n:18/ TAR /3-86
. '9
- t I
SNUPPS FSAR ORAWINGS FOR HPI SYSTEM APPENDIX C 1167n:18/ TAR /3-86
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