ML20210K417
| ML20210K417 | |
| Person / Time | |
|---|---|
| Site: | Farley  |
| Issue date: | 08/31/1986 |
| From: | WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP. |
| To: | |
| Shared Package | |
| ML20210K387 | List: |
| References | |
| NUDOCS 8610010431 | |
| Download: ML20210K417 (22) | |
Text
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l JOSEPH M. FARLEY UNITS 1 AND 2 SAFETY-RELATED MOV APs FOR THE HIGH PRESSURE COOLANT INJECTION SYSTEM AUGUST 1986 WESTINGHOUSE ELECTRIC CORPORATION NUCLEAR ENERGY SYSTEMS P.O. BOX 355 PITTSBURGH, PENNSYLVANIA 15230 1579n:1/ TAR /9-86
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FARLEY HPI MOV AP TABLE OF CONTENTS PAGE I. INTRODUCTION 3 II. METHODOLOGY 3 A. HIGH PRESSURE COOLANT INJECTION DEFINITION 3 B. GENERAL HPI VALVE SELECTION 4 C. FLUID SYSTEMS EVALUATION 5 D. FARLEY E0P SURVEY 7 E. NORMAL OPERATION 8 III. APPLICATION TO FARLEY 8 A. HPI VALVE SELECTION APPLIED TO FARLEY 8 B. FLUID SYSTEMS EVALUATION APPLIED TO FARLEY 9 C. LICENSING BASES FOR FARLEY 9 D. REFERENCE 10 1579n:2/ TAR /9-86 1
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I. INTRODUCTION Provided herein is a detailed review and documentation of the design basis, differential pressures (AP) for the Farley high pressure coolant injection (HPI), motor-operated valves. The purpose of this review is to respond in part to Action Item (a) of I&E Bulletin 85-03. Specifically, this report provides "the maximum differential pressure during both opening and closing the valve for both normal and abnormal events to the extent that these valve operations and events are included in the existing, approved design basis." This review follows the methodology developed as part of the Westinghouse Owners Group Safety Related'MOV program.
There are two major sections in this report.Section II discusses the methodology used in selecting the HPI MOVs and in evaluating these MOVs to determine the maximum differential pressure.Section III is the application of this methodology to the Farley Station. Table 1 lists the HPI MOVs selected and Table 2 gives the maximum operating APs.
II. METHODOLOGY A. High Pressure Coolant Injection Definition High pressure coolant injection is 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.
"High pressure coolant" injection is defined as:
- 1. Those portions of the Safety Injection System (or Emergency Core Cooling System) not including the Accumulator Injection System or Residual Heat Removal (RHR) System. This includes portions of the CVCS and the HHSI.
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- 2. Those portions of the above defined HPI systems necessary to establish a flowpath(s) from the Refueling Water Storage Tank (RWST) to the Reactor Coolant System (RCS). ,
- 3. Only those portions of the HPI (as defined in 1 and 2 above) required during the safety injection phase, not including the
' manual / 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 (in 1 above).
B. General HPI Valve Selection The HPI MOVs were selected based on their function within the HPI system (defined above). In general, there are three functions required to establish high pressure coolant flow to the RCS.
B.l. The normal CVCS flowpath to the RCS is isolated:
B . l .1 Isolate normal CVCS suction from the Volume Control Tank (VCT).
B.1.2 Isolate normal CVCS discharge to the RCS.
B.2. The SI flowpath is established from the RWST to the centrifugal charging pumps (CCP) to the RCS.
8.3. CCP miniflow MOVs should be correctly positioned to assure proper pump operation and required design flow.
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a .
C. 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 centrifugal charging pumps) are exposed to more bounding fluid conditions for these recirculation modes.
Two different sets of single failure criteria were used for the fluid systems evaluation depending on whether short term operating modes or long term operating modes were being considered.
- 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). Short-term operation is the safety injection phase of operation, up to and not including the nanual/ partial auto transfer to recirculation.
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- 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. Long-term operation is the remainder of the recovery period following short-term safety injection.
Long-term operation involves bringing the plant to cold shutdown conditions.
In general, the fluid systems evaluation was the determination 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 equipn.ent specification (E-Spec) AP.
(E-Spec AP > Max. Oper. AP). For testing purposes [IEB 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 l 2. Relief Valves- Setpoint limits system pressure
- 3. Piping Losses and Elevation Changes
- 4. Check Valves- No gross backleakage i
- 5. Tanks - Elevation head, design pressure
- 6. Other MOVs - Position (0 pen /close)
Outside the system, the following information is important to AP:
e g o .
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 configJration and equipment constraints.
Finally, these maximum operating differential pressures were compared against the valve design specification AP to verify adequate design.
D. Farlev E0P Survey The Farley E0P survey determined when the selected MOVs (HPI MOVs -
Table 1) are required to function for emergency operation. In addition, the survey identified other important characteristics of the system operation (pump on/off) which impact the MOVs capability to function. Therefare, the E0P survey provided a check of current E0P operations (involving these MOVs) against the original fluid.
systems design assumptions for MOV operating modes. (The E0P survey is provided in Apnendix A.)
For each MOV, the E0P survey generated a list of E0P 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 E0P operation (e.g., SI alignment), the l required MOV operation (open or close), and the equipment operating (pumps) during the operation. The E0P operation general cases were checked against the fluid systems assumptions. If the E0Ps and the fluid system assumptions are consistent, then a yes appears in the "EOP Confirmation" column of Table 2.
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E. Normal Operation The HPI system generally functions during off-normal situations when safety injection flow is required. However, part of the system has normal operative functions. Since the CVCS functions for HPI, it i s necessary to isolate the normal charging path to the RCS, prior to establishing the safety injection path. This is accomplished by isolating the normal CVCS suction from the VCT and the normal CVCS discharge to the RCS. The maximum operating APs determined for the normal CVCS suction and discharge MOVs, bound any pressure
- - differential condition which may be encountered during normal operation. Specifically, I
The VCT suction MOVs have a maximum AP limited by VCT design pressure plus elevation head.
The normal CVCS discharge MOVs have a maximum AP limited by the maximum discharge head of the centrifugal charging pumps (accounting for any suction boost from the VCT).
III. APPLICATION TO FARLEY A. HPI Valve Selection Applied to Farlev Using the selection criteria defined in II.B., the HPI valve list was
, generated for Farley, and is shown in Table 1. The table lists the l
l MOVs by function and by Farley 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.l.1, B.1.2, B.2, B.3, as defined in the " General HPI Valve Selection" section II.B.).
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B. Fluid Systems Evaluation ADD 11ed to Farley The application of the fluid systems evaluation to the HPI system is shown in Table 2. The table gives the following information:
- 1. Farley valve number
- 2. Valve function
- 3. Valve location
- 4. Design E-Spec AP
- 5. Maximum operating AP
- 6. Justification for maximum operating AP
,7 . E0P Confirmation of operating assumptions Following Table 2 is the applicable justifications for maximum operating AP.
The maximum operating AP is a relaxation of the design (E-Spec)
AP, based on the justification provided. The original fluid systems design makes operating mode assumptions in order to determine APs for each MOV. The E0P confirmation is a check that the current Farley E0Ps are consistent with the fluid systems operating assumptions. If a yes appears in the "EOP Confirmation" column, then the worst case E0P operation is consistent'with the fluid system design assumption.
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! C. Licensino Bases for Farlev
- Chapters 15 and 6 of the Farley 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 safety injection flow.
For safety injection flow, the following motor-operated valves automatically move:
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- 1. 8803 A&B open (BIT Inlet Isolation Valves)
- 2. 8801 A&B open (BIT Outlet Isolation Valves)
- 3. LCV-ll5B&D open (RWST Suction Valves to Charging Pumps)
- 5. 8107/8108 close (CVCS Normal Discharge Valves) .
In addition to these automatic actions, the operator may open and close the CCP miniflow valves to ensure adequate miniflow protection and high pressure coolant injection flow respectively. Following an "S" signal, the operator is instructed to open the miniflow valve when RCS pressure exceeds 1900 psig and isolate miniflow when pressure f alls below 1300 psig.
D. Reference Farley E-Spec #G-677383 Rev. 2.
E-Spec #G-678852 Rev. 2.
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TABLE 1. FARLEY HPI VALVES FARLEY POSITION OR (Required MOV VALVE NUMBER RE-POSITION for CL Inj.)
- FUNCTION BIT Inlet 8803 A&B Normally Closed B.2 Isolation Opens on "S" signal BIT Discharge 8801 A&B Normally Closed 8.2 Isolation Opens on "S" signal CCP Pump LCV-115 B&D Normally Closed B.2 Suction from Opens on "S" signal RWST CCP Pump LCV-115 C&E Normally Open B. l .1 Suction from Closes on "S" signal if VCT LCV-115 B&D Open (Train Dependent)
CVCS Normal 8107 Normally Open B.1.2 Disch. Isol. 8108 Closes on "S" signal CLP Suction 8130 A&B Normally Open B.2 Cross Connect 9131 A&B CCP Discharge 8132 A&B Normally Open B.2 Cross Connect 8133 A&B Charging Pump 8106 Normally Open B.3 Mini Flow 8109 A,B&C Manually aligned as '
necessary
! *See " General HPI Valve Selection" (II.B.) section for an explanation of
" function".
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--. _- - - - m - - --& -- . _ - --a u a TABLE 2 .
Maximum E0P -
Design Operating Justification Confirmation Farley *(E-SPEC) AP AP .
for Max. of Operation MOV Valve Number Close Open Close Open Operating AP Assumptions BIT Inlet 8803 A&B 2750 2750 2750 2750 Open - 1 Yes Isolation Close - 2
- BIT Discharge 8801 A&B 2750 2750 2750 2750 Open - 1 Yes Isolation Close - 2 CCP Pump Suction LCV-115 C&E 200 200 100 100 Open - 3 Yes from VCT Close - 3 CCP Pump Suction LCV-ll5 B&D 200 200 200 50 Open - 5 Yes from RWST Close - 4 CVCS Normal 8107 2750 2750 2750 2750 Open - 7 Yes Discharge Isolation 8108 Close - 7 CCP Suction 8130 A&B 200 200 200 200 Open - 6 Yes Cross Connect 8131 A&B Close - 6 CCP Discharge 8132 A&8 2750 2750 2750 2750 Open - 7 Yes Cross Connect 8133 A&B Close - 7 CCP Pump 8106 2750 2750 2750 2750 Open - 9 Yes Miniflow 8109 A,B,C Close - 8 4
- Farley E-Spec G-677383 Rev. 2 E-Spec G-678852 Rev. 2 JUSTIFICATION FOR TABLE 2
- 1. The BIT isolation valves must be able to open with a AP -equal to the charging' pump maximum allowable shutoff head.
- 2. During switchover to recirculation, these valves are closed, with the charging pumps running. As such, the closure AP could be as high as 2750 psi.
- 3. 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 valves. This is estimated to be ~100 psig. For maximum opening AP, it can be assumed that valve may have to open given maximum VCT pressure plus elevation.
- 4. These valves must be able to close to isolate the RWST from the discharge of the RHR pumps during the recirculation mode of operation, as a precautionary measure in the event of backleakage through check valve 8926. For this scenario, the AP across the. valves could be as high as the RHR pump discharge head ~200 psig.
- 5. These valves are normally closed but are required to open following an "S" signal. The maximum AP results from the maximum VCT pressure
(~100 psig) on the downstream side of the MOV minus the RWST head
(~50 psig) on the upstream side..
- 6. These valves must be able to be moved while the RHR pumps are operating and lined up to the suction of the charging pumps. For this case, the AP across the valves could be as high as the RHR pump discharge head
~200 psig.
- 7. These valves must be able to be moved while the charging pumps are operating. For this case, the AP will equal the charging pumps maximum j shutoff head.
l t 8. Normally, these valves are only closed following an "S" signal when RCS pressure is less than 1300 psig. However, for this case we assume that the operator may have.to close these valves for test purposes against l charging pump maximum shutoff head.
- 9. An off-normal condition was assumed here in which the operator may have
! closed the valve for testing purposes, and then have to re-open valve against charging pump maximum shutoff head.
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JOSEPH M. FARLEY UNITS 1 AND 2 EMERGENCY OPERATING PROCEDURES SURVEY
. HIGH PRESSURE COOLANT INJECTION VALVES APPENDIX A
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- m BIT Outlet Isolation Valves (8801 A/8)
BIT Inlet Isolation Valves (8803A/8) -
ESP-1.1, Step 5.4 Case 1: Isolate BIT ESP-1.2, Step 10.6 ESP-1.4 Step 1.3 .
EEP-3, Step 17.5 FRP-C.1, Step 1.5 FRP-C.2, Step 1.4 FRP-H.1, Step 11.4 FRP-H.1, Step 19.6 -
FRP-I.1, Step 3.5 FRP-P.1, Step. 6.5 ECP-1.1, Step 12.3.4*
ECP-2.1, Step 11.4 ECP-3.1, Step 13.6 ECP-3.2, Step 10.6 -
ECP-3.3, Step 9.5
- ESP-1.1, Step 5.5 Case 2 SI alignment - open valves
'- ESP-1.2 Step 6.1.3 ESP-1.2, Step 6.3.2 EEP-0 Step 5.1 EEP-3, Step 18 FRP-C.1, Step 1.4 FRP-C.1, Step 1.6.1 -
FRP-C.2, Step 1.3 FRP-C.2, Step 1.5.1 FRP-C.3, Step 2.3 FRP-H.1, Step 11.3 FRP-H.1, Step 11.5.1 FRP-I.2, Step 4.5 FRP-P.1, Step 7.1 EEP-0 Step 18.3 ESP-1.1, Step 6.1 ECP-1.1, Step 12.3.4*
ECP-0.2, Step 4.6 ECP-1.1, Step 12.1.2 ECP-2.1, Step 12 ECP-3.1, Step 8.1.3 ECP-3.1, Step 8.3.2 ECP-3.2, Step 13.1.2 ECP-3.3, Step 10 ,
Case 1: Close valves ag'ainst charging pump discharge conditions Case 2: Open valves against charging pump discharge conditions
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- Valves 8803A/B only 8550S
e charging Pump Suction Valves from RWST (1158,D)
Chargihg Pump Suction Valves f rom VCT (115C E) l EEP-3, Step 21 Case 1: Align charging pump suction to VCT or RWST l FRP-S.1, Step 4.2 -
FRP-S.2, Step 3.1 EEP-0, Step 5.1 -
EEP-0 Step 18.3 -
ESP-0.1, Step 1.4.2 ESP-1.1, Step 9 ECP-0.1, Step 4.2.2 ECP-0.2, Step 4.2 ECP-1.1, Step 12.1.'1* -
ECP-2.1, Step 16 ECP-3.3, Step 13 .
FRP-C.1, Step 1.3*
FRP-P.1, Step 15 ESP-1.3, Step 5.6* Case 2: Transfer to cold leg recirculation-Conditions Case 1: Open/close valves against RWST or VCT conditions Case 2: Close valves with RHR pumps running
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- Valves 115B,D only l
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85505
Charging Pump to Regen. Nx. Iso.' Valves (8107, 8108) l l
ESP-1.1, Step 5.3 Case 1: Establish normal charging -
l ESP-1.2, Step 10.5 ,
EEP-3, Step 14.2 EEP-3, Step 11.4 .
FRP-H.1, Step 8.3.1 FRP-H.1, Step 1g.5 FRP-I.1, Step 3.4 FRP-I.2, St2p 4.4 FRP-I.3, Step 2.3
- FRP-P.1, Step 6.4 FRP-S.1, Step 4.5 FRP-S.2, Step 3.4.1 ESP-0.1, Step 1.4.1 ESP-0.1, Step 8.1.3 ESP-0.2, Step 5.2.2 -
ECP-0.1, Step 5.2 ECP-2.1, Step 11.3 ECP-3.1, Step 13.5 ECP-3.2, Step 10.5
- ECP-3.3, Step 5.2 ECP-3.3, Step 9.4 ESP-1.2. Step 6.1.3 Case 2: Isolate normal charging / verify SI alignment EEP-0. Step 5.1 FRP-I.1, Step 9.2.1 EEP-0 Step 18.3 ECP-0.1, Step 4.2.4 '
ECP-0.2, Step 4.4 ECP-1.2, Step 1.5 ECP-3.1, Step 8.1.3 Case 1: Open valves against charging pump discharge conditions Case 2: Close valves against charging pump discharge conditions i
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Charging Pump Suction Isolation Valves (8130A,8; 0131A,8)
ESP-1.3, Step 5.4 Case 1: Transfer to cold leg recircu1stion l EEP-3, Step 21 Case 2: Align charging pump suction to VCT or RWST EEP-0, Step 5.1 ,
EEP-0, Step 18.3 ~
ESP-1.1, Step 9 ECP-0.1, Step 4.2.2 ,
ECP-0.2, Step 4.2
- ECP-2.1, Step 16
- ECP-3.3, Step 13 FRP-P.1, Step 15 FRP-S.1, Step 4.5 .
Case 3: Align charging pump suction to BA system FRP-S.2, Step 3.4.1 ESP-0.1, Step 1.4.1 FRP-C.1, Step 1.6.2 Case 4: Align charging pump suction to RWST or RHR FRP-C.2 Step 1.5.2 discharge FRP-H.1, Step 11.5.2 Conditions Case 1: Open/close valves against RWST conditions Case 2: Open/close valves against RWST and VCT conditions Case 3: Open valves against BAT pump discharge conditions Case 4: Close valves against RWST or RHR pump discharge conditions 1
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85505
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4 Charging' Pump Discharge Isolation Valves (8132A,B; 8133A,B)
ESP-1.1, Step 5.3 Case 1: Establish normal charging ESP-1.2, Step 10.5 EEP-3, Step 17.4 FRP-H.1, Step 19.5 .
FRP-I.1, Step 3.4 FRP-I.2, Step 4.4 .
FRP-I.3, Step 2.3 FRP-P.1, Step 6.4 ECP-0.1, Step 5.2 ECP-2.1, Step 11.3
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ECP-3.1, Step 13.5 .
ECP-3.2. Step 10.5 ECP-3.3, Step 9.4 ESP-1.3, Step 5.8 Case 2: Transfer to cold leg recirculation .
ECP-0.2, Step 4.2 .
FRP-C.1, Step 1.2 Case 3: Align charging pump discharge to BIT FRP-C.2. Step 1.2
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FRP-C.3, Step 2.2 FRP-H.1, Step 11.2
- EEP-0 Step 5.1 EEP-0, Step 18.3 FRP-C.1, Step 1.6.2 FRP-C.2, Step 1.5.2 ~
FRP-H.1, Step 11.5.2 FRP-S.1, Step 4.5 Case 4: Establish emergency boration FRP-S.2, Step 3.4.1 ESP-0.1, Step 1.4.1 Conditions -
Case 1,2,3,4: Open/close valves against charging pump discharge conditions i
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', l Charging Pump Miniflow Valves (8109A,B C)
Charging Pump Miniflow Isolation Valve (8106)
ESP-1.1, Step 5.1 Case 1: Establish normal charging -
ESP-1.2, Step 10.5 EEP-3, Step 17.2 FRP-H.1, Step 19.5 .
FRP-I.1, . Step 3.2 FRP-I.2, Step 4.2 FRP-I.3, Step 2.4 FRP-P.1, Step 6.2 ECP-0.1, Step 4.2.3 -
ECP-2.1, Step 11.1 ECP-3.1, Step 13.5 ECP-3.2, Step 10.5 ECP-3.3, Step 9.2 Case 2: Verify SI alignment
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EEP-0 Step 23.1 ;-
EEP-0, Step 5.1, Foldout Page EEP-0, Step 5.2, Foldout Page EEP-1. Step 5.1, Foldout Page EEP-1. Step 5.2, Foldout Page EEP-3, Step 5.1, Foldout Page EEP-3, Step 5.2 Foldout Page ESP-0.0, Step 5.1, Foldout Page ESP-0.0, Step 5.2, Foldout Page ESP-0.1, Step 5.1, Foldout Page ESP-0.1, Step 5.2, Foldout Page ESP-0.2, Step 5.1 ESP-0.2, Step 5.2 ESP-0.4 Step 5.1 ESP-0.4, Step 5.2 ESP-1.1, Step 5.1 ESP-1.1,' Step 5.2 ESP-1.2. $tep 5.1 ESP-1.2, Step 5.2 ESP-1.3, Step 5.1 ESP-1.3, Step 5.2 ESP-1.4, Step 5.1 ESP-1.4 Step 5.2 ESP-3.1, Step 5.1 ESP-3.1, Step 5.2 ESP-3.2, Step 5.1 ESP-3.2, Step 5.2 .
ESP-3.3, Step 5.1 ESP-3.3, Step 5.2 V '
ECP-0.2, Step 4.3 ECP-0.2 Step 4.7.1 -
ECP-1.1, Step 12.3.3 -
ECP-2.1, Step 5.1, Foldout Page ECP-2.1, Step 5.2, Foldout Page 85505
Charging Pump Miniflow Valves (8109A,B,C) (Cont.)
Charging Pump Miniflow Isolation Valve (8106)
ECP-3.1, Step 5.1, Foldout Page ECP-3.1, Step 5.2 ECP-3.2, Step 5.1 -
ECP-3.2, Step 5.2 ECP-3.3, Step 5.1 ECP-3.3, Step 5.2 U Conditions Case 1: Open valves against charging pump discharge conditions (
Case 2: Open/close valves against charging pump discharge conditions '
Operators are instructed to open valves when RCS pressure exceeds l 1900 psig and isolate miniflow when the RCS pressure falls below 1300 psig. [
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W, W 8 5 ATTACHMENT 3
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