ML20196A998
| ML20196A998 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 06/17/1999 |
| From: | SOUTHERN CALIFORNIA EDISON CO. |
| To: | |
| Shared Package | |
| ML20196A985 | List: |
| References | |
| PROC-990617, NUDOCS 9906230052 | |
| Download: ML20196A998 (76) | |
Text
ENCLOSURE 2 The Southern California Edison Company (SCE)
Risk-informed Inservice Testing Program Revised Program Pages
?!A'R88EE3188sa61 P
RIsx-INFORMED IST PROGRAM FOR SOUTHERN CAUFORMIA EolsoN ENGINEERwG AkALYSIS component failure history on the whole is consistent with failure data reported to NPRDS. Generic data (and indeed, most interpretations of plant-specific data) considers components in groups. But ranking was done on a component basis. Consequently, the Expert Panel considered whether or not plant-specific operational insights indicated component reliability problems that might affect the ranking of an individual component or small group of components. Components with operational concems were considered more l
I risk significant by the Expert Panel.
Finally, the completeness of the models, assumptions and input data was tested by sensitivity studies. The sensitivity studies performed for the SONGS RI-IST component categorization considered both the issues addressed by the ASME Code Case and the Comanche Peak RI-IST pilot project.
The sensitivity studies addressed specific attributes of four general topic areas:
e Operator actions e Common cause failure (CCF) e Maintenance unavailabilities Uncertainty in component failure probabilities e
Each of these issues was judged to be of sufficient significance to affect component categorization For operator actions, two general types of studies were performed, giving no credit to operators and increasing low human error probabilities (HEPs) to nominal values. For the first type, operator actions were considered in two groups, namely recovery actions and post-accident actions. Because there were so many post-accident operator actions, assuming no credit did not yield meaningful results frem the sensitivity case. However, assuming no credit for just recovery actions identified two valves (HV4714 and HV4731, AFW Discharge to Steam Generator Isolation Valves) with potentially unique importance. For the second type of HRA sensitivity study, increasing low HEPs, no new components became important.
The Expert Panel reviewed these results. The Panel concluded that no change in categorization was required for the two valves. While the Panel acknowledged the logic of the sensitivity study, the study also showed that the HEP would have to increase to a very large value for the risk ranking of the two valves to change. Significant time and adequate procedure guidance was deemed to be available to perform the action. Therefore, the Expert Panel concluded that the original PRA ranking was reasonable and that uncertainty in HEPs did not impact the component categorization of these two valves. Further, the sensitivity study gave the Panel additional confidence that the categorization of IST components was not l
subject to the effects of uncertainty in HEPs.
For cummon cause failures (CCF), the sensitivity study considered two aspects of the influence of CCF on component categorization. First, because CCF can sometimes dominate risk, its contribution can mask individual component failure modes. No masking was found.
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RISK INFORMED IST PROGRAM FOR SOUTHERN CAUFORNIA EolsON ENGINEERING ANALYSIS l
it exists). The codes utilized in this analysis are listed and described below in Table 2.4-1.
l l
Table 2.4-1: Corrective Maintenance Classification l
l FAILURE?
- ILEASON DESCRIPTION CODE F3 Problem with component function, function is " e. an IST safety function, not an IST functional failure F4 component performed as intended, satisfied IST objectives, not an IST functional fadure L1 Extemal leakaae (packing, bonnet, boric acid accumulation on punce part), not an IST functional failure L2 Leak by (usually by valve seat), not an IST functional failure M1 Post maintenance test (PMT) failure, prior to valve retum to service M2 Maintenance of valve or pump to prevent future functional fadure M3 Maintenance-inducedproblem (programmatic, test-related. ete ) not an IST functional fadure N1 Failure of component piece part maior component still operable NO N2 Procedural problem, not an IST functional failure N3 Other (often signifies that there was no work performed. no problem found) l P1 Problem with local position indication cauge, or with position limit switch R1 Component or component piece part replaced, or is scheduled for replacement, not an IST functional failure T1 IST test reference value revised or acceptance entena changed, IST failure negated T2 Improper test r..ethodology (test procedure might require revision), IST failure negated T3 Stroked outside reference range. not a functional failure (vahe stroked within Tech Scec limrts)
F1 IST failure (does not involve PMT. improper test method, or inaccurate test reference)
YEs F2 In-situ functional fadure PROSLEM WITH P2 Accurate position indication is not known in the control room PosmoN INDICATION According to the screening criteria in the table, if the corrective maintenance event concemed non-critical leaking (e.g., packing leakage or the valve is not leak tight in the absence of IST leakage criteria), the reviewer classified the event as a non-failure with an assigned reason codes (for this example, L1). This is a.1 acceptable disposition, as the corrective maintenance did not involve a functional failure (e.g., failure to close). However, if the corrective maintenance event concemed leaking past the valve seat, the reviewer investigated the description of the work performed to determine whether or not the leaking was severe j
enough to prevent the valve from performing its safety function to close. If not, it was classified as a non-
]
failure. If the corrective maintenance involved an IST failure related to the test procedure or test reference, one or both of which had been subsequently revised as part of the corrective maintenance, the maintenance-related event or precursor was classified as a nr n-failure. Additionally, if the component failed its IST fol lowing any type of maintenance (e.g., past-maintenance test) but before the component had i
l been formally returned to service, it was classified as a non-failure.
j i
Once the corrective maintenance history had been fully reviewed for a component, all failure events or 1
\\
particularly eventful corrective maintenance historie: were reported to the Expert Panel for their consideration during the risk categorization process. This was useful in facilitating the determination of a
contentious performers (i.e., those valves for which the LSSC categorization merits assigning either a i
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RISK INFORMED IST PROGRAM FOR SOUTHERN CAUFORNIA EDISON ENGWEERNG hNALYSIS l
compensatory measure, retaining the current test interval, or changing the ranking to HSSC). Based on l
consideration of this evaluation, the Panel changed the rankings of the following components:
U COMPONENT DESCRIPTION ORIGINAL REVISED RANKING OR DISPOSITION RANKING
- PCV6358, CCW SURGE TANK NITROGEN LSSC LSSC with assigned compensatory measure PCV6361 BACKPRESSURE REGULATOR Test interval not extended.
HV4714, HV4731 AFW DISCHARGE TO STEAM LSSC LSSC with assigned compensatory rneasure GENERATOR E/H ISOLATION VALVE-HV4762 HV4763 AFW PUMP TO DISCHARGE LSSC Test interval not extended. Retained LSSC BYPASS VALVE ranking because these valws can be isdated by manual block valws, isolation does not affect performance of key system safety function.
1201MU003, MAIN STEAM SUPPLY TO LSSC HSSC 1201MUOO5 AFWTD PUMP 1201MU976, PRESSURIZER SPRAY LINE LSSC LSSC. Test interval not extended because test 1201MU977 CHECKVALVES histoncally administered incorrecdy 1305MU496, AFW CHEMICAL ADDITION LSSC Test interval not extended. Retained LSSC j
1305MU497, VALVES ranking because these valves can be isolated by 1305MU496, manual block valws, isolation does not affect 130SMU499, peMormance of key system safety function.
1305MU539, 1305MU541 1413MUO13, EMERGENCY BEARING LSSC LSSC. Test interval not extended. These va!ws 1413MUO16, COOLING WATER CHECK exhibited a higher than expected failure rate in the 1413MUO21, VALVES past. Corrective actions were implemented, but 1413MUO24 insufficient history exists (after the corrections) to extend the interval.
1413MU0d7, BEARING COOUNG WATER LSSC LSSC. Test interval not extended. These vanes i
1413MUO48, CHECK VALVES exhibited a higher than expected failure rate in the 1413MUO49, past. Corrective actions were implemented, but i
1413MUO50 insufficient history exists (after the corrections) to extend the interval.
2.4.2 Additional Expert Panelinputs in addition to the component corrective maintenance evaluation, the Expert Panel considered relevant plant licensing commitments for IST, generic Combustion Engineering design issues, plant procedures, and inservice testing pefformance.
Furthermore, the Panel considered the results of sensitivity studies performed to evaluate whether PRA assumptions mask the true importance of IST components. The sensitivity studies demonstrated the quality of SCE's PRA, as components shifted slightly within the bounds of their ranking category, but did not, in general, shift enough to merit a ranking change. The one exception involved the sensitivity study pertaining to the modeling of human actions. If the PRA assumes a human error probability (HEP) of 1.0 for
" Atthough the test interval for these components will not be extended inrttally due to specific performance issues, the PRA analysis for cumulative nsk assumes the bounding values listed in the Table 3 21. The interval determined by the Integrated Decisionmaking Process can be no greater than this value for a given grouping without performing specific PRA analysis to support it.
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l RISK-INFORMED IST PROGRAM FOR SOUTHERN CAUFORNIA EDISON IMPLEMENTATIOM AMo MOMITORING PROGRAM 3
IMPLEMENTATION AND MONITORING PROGRAM 3.1 Mservice Tesnna Proaram Chances Testing for components in the current IST program classdied as HSSCs continues per the current IST program, which meets the requirements of the#1989 Edition of the ASME Boiler and Pressure Vessel Code,Section XI, except where specific written relief has been granted. The SCE RI-IST evaluation process concluded that the monitoring mandated by the current IST program for all components ranked as HSSCs is adequate. Where the ASME Section XI testing is practical, HSSC ranked valves or pumps not in the current ASME Section XI IST Program Plan will be tested in accordance with OM-1 for safety relief valves, OM-10 for active valves and OM-6 for pumps. Where the ASME Section XI testing is not practical, al'stnative methods will be developed to ensure operational readiness.
Note that there are two distinct subgroups based en RAW ranking. Those components with a high RAW
(>2) and a low Fussell-Vesely (< 0.001) are described as L-H (Iow Fussell-Vesely, high RAW) while those components with a low Fussell-Vesely and a low RAW (< 2) are described as LSSCs. For simplicity, the text in this section refers to both categories as LSSCs unless the topic refens to a specific subgroup.
As modified by the testing strategy described below, components in the current IST program which are determined to be LSSC will also be tested in accordance with the ASME Code,Section XI requirements, except that the test frequency will initially be edended from quarterly (or cold shutdan/ refueling as applicable) to a maximum of once every 6 years (except for the refueling water storage tank outlet check valves and the emergency sump check valves which will be extended to a maximum of 8 years) plus a 25%
margin, depending on the number of valves in the group and their design, service condition, risk insights and ranking, performance history, and any compensatory measures. The extended test frequency will be staggered up to 8 years as described in Section 3.2 below. All other Code testing methods, corrective actions, documentation, and other requirements will remain in effect. Note that a rank of LSSC is insufficient justification for removing a pump or valve from the ASME Code,Section XI IST program.
Therefore, all components tested in SCE's current IST program remain in the Rl-IST program. As is true with the current IST Program, RI-IST program selection criteria remains fundamentally based on the component safety function as defined in the applicable Code sections.
By using PRA methods, a maximum test interval was determined for LSSCs. This information was provided to the Expert Panel for their consideration during component categorization deliberations. During periodic reassessments, the maximum test interval will be verified or modified as dictated by the integrated decision-making process, SCE will continue to consider other test methods, such as non-intrusive testing and disassembly / inspection.
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RISK-INFORMED IST PROGRAM FOR SOUTHERN CAUFORNIA EolsOM IMPLEMEMTATION Amo MONITORING PROGRAM 3.1.1 Testing Strategy SCE's proposed RI-IST testing strategy for each component group will ensure to the extent practicable that adequate component capability margin exists above that required during design basis conditions. As such, component operating characteristics will not be allowed to degrade to a point ofinsufficient margin before the next scheduled test activity. On this basis,,the testing strategies were deemed acceptable.
SCE's proposed RI-IST program identifies components that are candidates for an improved test strategy (i.e., frequency, methods, or both) as well as components for which the test strategy may be relaxed. The information contained in and derived from the SONGS PRA was used to help construct the testing strategy for components. Components with high safety significance will be tested in ways that are at least as effective as the current Code-required test at detecting their risk-important failure modes and causes (e.g.,
at least as effective at detecting failure, detecting conditions that are precursors to failure, or predicting end of service life). Components categorized as L-Hs and LSSCs will generally be tested less rigorously than components categorized as HSSCs (e.'g., less frequent tests).
The proposed component IST test intervals have not been extended beyond once every 6 years (approximately 3 refueling outages, plus a 25% margin), except for the refueling v uter storage tank outlet check valves and the emergency sump outlet check valves, which have not been extended beyond once every 8 years plus a 25% margin. With the exception of relief valves and check valves,IST components are scheduled to be exercised or operated at least once every refueling cycle.
Test strategies were essentially augmented by leaving them as-is for all HSSCs in the IST program and adding diagnostic methods where porsible. In a number of cases, only one IST function was risk-significant; nevertheless, all component functions were conservatively maintained as HSSC although the PRA rar, king indicated some of the test intervals for LSSC functions were eligible for extension.
SCE considered component design, service condition, and performance history, as well as risk insights, in establishing the technical basis for the test strategy and interval assigned to each component as illustrated by the following examples:
1, A component was considered HSSC if the component had,in the opinion of the Expert Panel, a poor performance record. By categorizing the component as HSSC, the test strategies were left as-is and the test intervals were not extended. In the case of insufficient history (i.e., new component, either new to the program or new style), the component ranking considered PRA risk metrics, component safety function redundancy, and other relevant inputs from the Expert Panel, but for these cases the Expert Panel opted to retain the current test frequency until sufficient performance history has accumulated to justify a future test interval extension.
- 2. The SONGS Expert Panel also considered the impact of service condition on component performance.
If the service condition had no impact on performance, the PRA results were unchanged. In a few cases, such as the two steam supply check valves to the turbine driven AFW pump (1301MU00'3 and 3-2 i
r-
~ RIsx-NFOGMED IST PROGRAM FOR SOUTHERN CAUFORNIA EDISON IMPLEMENTATION Ahlo MONIYORING PROGRAM 1301MU005), the Expert Panel considered the component function critical to safety system performance. Due to severe service conditions, SCE decided to disassemble and inspect both steam Esupply check valves each refueling outage. Since the wear on these valves is significant, the Expert Panel decided to rank them HSSC and continue to disassemble and inspect these valves each refueling until their wear characteristics are fully resolved. Design changes to mitigate the effects of the i
service conditions are being reviewed.
SONGS has not submitted any Technical Specification amendments in conjunction with this risk-informed IST program submittal; therefore, all surveillance testing required by the technical specifications will continue to be conducted. Technical Specification surveillance testing is sometimes noted as a compensatory measure for the IST interval extensions associated with L-H and LSSC ranked components.
An example is the subgroup relay testing which is performed semi-annually and exercises numerous LSSC components. Although there are other compensatory measures, such as exercising during plant schedu;ed actuties such as circulating water system heat treatment, or periodic equipment rotation for equalizing run hours, SCE conservatively chose to use only compensatory measures with a regulatory basis (e.g.,
Technical Specification surveillances), such as the subgroup relay testing and MOV biennial strokes to support the calculation of cumulative risk.
Components that were the subject of a previously NRC-approved relief request are summarized in Section 2.1.2. As discussed therein, the current NRC-authorized relief (or alternative) remains appropriate and will continue in concert with this request. As Section 2.1.2 indicates, the two current program relief requests relate to pumps..There are no current relief requests for valves.
The following describes the proposed testing strategy for each group of components and is considered consistent with the existing NRC positions on component test strategies. The strategy also appears to agree with the general direction that the NRC is encouraging the ASME Code groups to take in defining test strategies for components categorized as being either high or low safety significant.
Motor-ooerated Valves (MOVs)
MOV testing will be in accordance with commitments to NRC Generic Letter (GL) 89-10, " Safety-Related Motor-Operated Valve Testing and Surveillance," and GL 96-05, " Periodic Verification of Design-Basis l
Capability of Safety-Related Motor-Operated Valves." Test frequency will be in accordance with the risk categorization defined below:
HSSC Testing will be performed in accordance with Code CaseOMN-1, and NRC Generic e
Letter 89-10 and 96-05 commitments. MOVs with a passive function will be tested per the Code of Record as defined in 10CFR50.55a.
L-H Testing will be performed in accordance with Code Case OMN-1 and NRC Generic Letter 89-10 and 96-05 commitments at an initial interval not to exceed 6 years until sufficient data exist to determine a more appropriate test frequency. MOVs with a passive function will be 3-3
Risx-INFORMEDi3T PROGRAM FOR SOUTHERN CALIFORNIA EotsOn IMPLEMENTATION AND MOf4fTORIi4G PROGRAM tested per the Code of Record, except at a test frequency not to exceed 6 years (with a 25%
margin) based on evaluation of design, service condition, performance history, a'nd compensatory actions. Seat leakage testing,if required, will be per the Code of record, except at a test frequency not to exceed 6 years (with a 25% margin).
LSSC Testing will be performed in accordance with Code Case OMN-1 and NRC Generic Letter 89-10 and 96-05 commitments. MOVs with a passive function will be tested per the Code of Record, except at a test frequency not to exceed 6 years (with a 25% margin). Seat leakage testing will per the Code of record, except at a test frequency not to exceed 6 years (with a 25% margin).
MOV performance will be verified in accordance with GL 96-05. The SONGS commitment for satisfying GL 96-05 is described in SCE's response to GL 96-05. Furthermore, SONGS MOV periodic verification testing will comply with the provisions of ASME Code Case OMN-1. This possbon is consistent with SCE's response to GL 96-05.
4 The motor-operated valve testing strategy described above is consistent with the guidance provided in Section 3.1 of RG1.175.
Relief Valves Testing of relief valves will continue to be conducted in accordance with the Code of record (OM-1) with no change in test interval. SCE believes that relief valve performance as a whole does not warrant interval extension. In the future, should performance history change, SCE will rank valves per the Integrated Decision-making Process (IDP) described in Section 2.4 and extend intervals accordingly.
Check Valves (CVs)
Check valves will be tested in accordance with the Code of Record (OM-10) with the exception that the test frequency will be in accordance with the component risk categorization defined below:
HSSC Testing will be performed in accordance with the ASME Code of Record as required by 10 CFR 50.55a.
. L-H Testing will be performed in accordance with the ASME Code of Record as required by 10 CFR 50.55a except based on evaluation of design, service condition, performance history, and compensatory actions, the test frequency may be extended not to exceed 6 years plus a 25%
)
margin, except for the refueling water starage tank outlet check valves and the emergency sump outlet check valves which may be extended not to exceed 8 years plus a 25% margin.
l LSSC Testing will be performed in accordance with the ASME Code of Record as required by 10 CFR 50.55a except based on evaluation of design, service condition, and performance history, the test frequency may be extended not to exceed 6 years plus a 25% margin.
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i Risx-INFORMED IS T PROGRAM FOR SOUTHERN CAUFORNIA EDIsoM IMPLEMENTATION AND MONITORii4G PaoGRhM The refueling water storage tank (RWST) and emergency sump outlet check valves currently comprise 2 cross unit valve groups,1) S2(3)1204MU001 and S2(3)1204MU002, and 2) S2(3)1204MU003, and S2(3)1204MU004. All eight valves are 24 inch lession Duo-Check split disk check valves. Testing is currently scheduled on a 6 year stagger test interval consisting of a disassembly, inspection, and hand stroke. Extending the test interval to 8 years on these 2 valve groups is reasonable given the valve history, t
and does not result in an interval which would allow degradation without prior detection. The results of the inspections indicate there is little, if any, wear over the initial 15 years of operation. These inspections validate the wear predictions calculated using the CVAP wear analysis software developed by Kalsi Engineering. The process of draining the 350 feet of 24 inch header piping (-8000 gallons) through % inch drain, removing the two valves (one from each group), and hand stroking requires several days. Once the header is re-filled, the venting operation requires multiple start-stop cycles on each of the high pressure I
injection, low pressure injection, and containment spray pumps on the particular train, and is extremely I
resource intensive. in addition, there is significant dose accumulation associated with disassembly, inspection and subsequent post maintenence test activities. To support a partial flow test of the sump check valves, the sump must be cleaned, then partially filled. The partial flow activity uses a low pressure injection pump for a short duration partial flow through the check valve. Due to the limited volume available in the sump, the pump run is very short in duration and requires exclusive attention in the control room during preparation and execution.
The RWST valves are partially opened for the quarterly pump inservice tests, and the sump valves are only exercised during the course of the hand stroke. A search of the NPRDS data archives shows there are no records of failures of this valve style (Mission check valves)in this application. The recorded NPRDS failures typically pertain to seat leakage increases, but do not involve failures to close. The NPRDS events primarily concern inservice water systems which have higher service duty than refueling water storage tank and emergency sump outlet check valves. Given this fact, coupled with the above discussion, extending the test interval to 8 years on these 2 valve groups is reasonable and does not result in an interval which would allow degradation without prior detection.
HSSC, L-H, and LSSC check valves at SONGS are candidates for inclusion in the Check Valve Program (CVP) which has been developed to provide confidence that check valves will perform as designed. Station procedure (s) establish testlexam frequencies, methods, and acceptance criteria and provide performance-monitoring requirements for check valves in the CVP. Check valves in the CVP include check valves that are in the IST program, check valves identrfied as susceptible to unusually high wear, fatigue, or corrosion, and special valves used for personnel safety such as those in the breathing air system. The CVP includes approaches for identification of existing and incipient check valve failures using non-intrusive (e.g.,
radiography, acoustic emission (AE), magnetic flux (MF), and/or ultrasonic examination (UE) testing methods) and disassembly examination. Test data will be used (e.g., trended as appropriate) to provide confidence that check valves in the CVP will be capable of performing their intended function until the next 3-5
RISK-NFORMED IST PROGRAM FOR SOUTHERM CAUFORNIA EolsoN IMPLEMENTATION AND MONITORING PROGRAM scheduled test activity. Check valves may be added to or deleted from the CVP based on non-intrusive testing, disassembly examination results, component replacement, or site maintenance history. Kalsi Engineering is nearing completion on a wear trending study for all check valves in the CVP. The results of this study will be factored in to the check valve test strategy using the Integrated Decision-making Process (IDP),
t CVP check valve groups are based on common characteristics (manufacturer, style, application, etc.) and the check valves in any group may have the testing staggered over an extended period (e.g., up to 6 years,
+25%) based on design, risk ranking, service condition, performance history, and compensatory actions.
Testing may be scheduled in regular intervals up to an 6-year period to ensure that all check valves in the group are tested at least once during the 6-year test interval and that not all components are tested at one time. Testing will be scheduled / planned such that there is no more than one cycle 'uetween tests of components in a group. Finally, the CVP is assess 4 on a biennial frequency, updated as appropriate with new design and operational information, and incorporates any applicable site or industry lessons leamed.
The check valve testing strategy described above is consistent with the guidance provided in Section 3.1 of RG1.175.
Air-Ooorsted Valves (AOVs)
AOVs will be tested in accordance with the Code of Record (OM-10) with the exception that the test frequency will be in accordance with the component risk categorization defined below:
HSSC Testing will be performed in accordance with the Code of Record as required by 10
)
CFR 50.55a.
L-H Testing will be performed in accordance with the Code of Record as required by 10 CFR 50.55a except based on evaluation of design, service condition, performance history, and compensatory actions, the test frequency may be extended not to exceed 6 years plus a 25%
margin. Additionally L-H AOVs will be stroked at least once during each operating cycle.
LSSC Testing will be performed in accordance with the Code of Record as required by 10 CFR 50.55a ) except based on evaluation of design, service condition, and performance, the test frequency may be extended not to exceed 6 years plus a 25% margin. Additionally, LSSC
' AOVs will be stroked at least once during each operating cycle.
In addition, all AOVs will be exercised at least once during each operating cycle.
SCE has committed to work with the Joint Owners Group for Air Operated Valves (JOG AOV) to develop an enhanced AOV testing program similar to the MOV test program established in response to GL 89-10 and GL 96-05 (described above). The intent of this program is to specify AOV Program requirements to provide
- assurance that AOVs are capable of performing their intended safety-significant or risk-significant functions.
Elements of the proposed program include establishing a scope of applicability, a categorization 3-6
Risk-INFORMED IST PROGRAM FOR SOUTHERN CAUFORNiA EDISON IMPLEMENTA TION AND MoetTORING PROGRAM methodology, validation of safety significant functions by performing design basis reviews, performing baseline testing, and identifying the types of periodic test 0g necessary to identify potential degradation in a
, timely manner. SCE's current testing program meets or exceeds the current JOG AOV testing requirements for components within the IST program. To date, the design basis evaluations of all AOVs have not been performed. These evaluations will check the availability capability margin versus the I
required design-bases conditions to ensure adequate margin does indeed exist.
The AOV program is assessed on a biennial frequency, updated as appropriate with new design and operational information, and incorporates any applicable site or industry lessons learned.
The proposed AOV testing program and planned test activities described above are consistent with the guidance provided in Sections 3.1 and 3.2 of RG1.175.
Hv&aulic Valves (EM Solenoid Valves. and 0.hers (Manual Valves. etc.)
SCE proposes to test these valves in accordance with the Code of Record (OM-10) with the exception that the test frequency will be in accordance with the component risk categorization defined below:
HSSC Testing will be performed in accordance with the Code of Record as required by 10 CFR 50.55a.
L-H Testing will be performed in accordance with the Code of Record as required by 10 CFR 50.55a except based on evaluation of design, service condition, performance history, and compensatory actions, the test frequency may be extended not to exceed 6 years plus a 25%
margin.
LSSC Testing will be performed in accordance with the Code of Record as required by 10 CFR 50.55a ) except based on evaluation of design, service condition, and performance history, the test frequency may be extended not to exceed 6 years plus a 25% margin.
Hydraulic valves will be exercised at least once during each operating cycle.
T?e proposed testing program described at ove is consistent with the guidance provided in Section 3.1 of RG1.175.
Pumos Pumps will be tested in accordance with the Code of Record (OM4i) with the exception that the test frequency may be in accordence with the component risk categorization defined below:
HSSC Testing will be performed in accordance with the Code of Record as required by 10 CFR 50.55a. Additionally, Code testing will be augmented with periodic oil analysis and thermography. A motor current monitoring program is in the development stage. Once implemented, HSSC pumps will be included in the scope of that program.
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Rtsx-INFORMED IST PROGRAM FOR SOUTHERN CAUFORNIA EotsoN IMPLEMEi4TATION Aito MONITORING PROGRAM L-H Testing will be performed in accordance with the Code of Record as required by 10 CFR e
50.55a except based on evaluation of design, service condition, performance history and compensatory actions, the test frequency may be extended not exceed 6 years plus a 25%
margin.
LSSC Testing will be performed in accordance with the Code of Record as required by 10 CFR 50.55a except the test frequency may be extended not to exceed 6 years plus a 25%
margin.
At this point no test interval extension for pumps is planned, regardless of Expert Panel categorization as
(
1 LSSCs for a few pumps in the RI-IST Program.
i All pumps will receive periodic thermography of their driver, lube oil analysis, alignment checks performed following major pump maintenance (using vibration analysis methods to confirm alignment), motor current j
testing (when the motor current testing program is implemented), vibration monitoring (required by the current Code), and flange loading checks of connected piping (note that this flange loading test is not periodic, but is performed after major maintenance / overhauls that required the disassembly of any flange in 28 a safety-related system). Additional tests (e.g., thermography of the driver, or motor current testing ) are predictive in nature and involve trending of parameters that need to be compared more frequently in order to provide meaningful results. This augmented testing program for pumps is consistent with the guidance provided in RG1.175, and provides reasonable assurance that adequate pump capacity margin exists such that pump operating characteristics over time do not degrade to a point of insufficient margin before the next scheduled test activity.
The above testing strategy is consistent with the guidance provided in Section 3.1 of RG1.175.
3.2 Pt&&iexiknolementatial implementation of SCE's RI-IST Program consists of grouping components and then staggering the testing of the group over the extended test interval for those components ranked L-H or LS30.
3.2.1 Grouping SCE performed a rigorous grouping analysis that involved several component attributes. The results of the i
grouping analysis are presented in Table 3.2-1, located at the end of Section 3. The groups share the following distinct characteristics:
System Component type (MOV, AOV, Check Valve, etc.)
e Manufacturer
" Both driver thermography and rnotor current testing are currently in the early stages of implementation at SCE.
3-8
1 RISK-INF03MED IST PROGRAM FOR SOUTHERN CAUFORNIA EatsoN IMPLEMEMTATION AND MONITORING PROGRAM sue Style (globe, gate, swing check, tilt disk, etc.)
- Application (pump discharge, flow path, orientation, etc).
i The grouping attributes selected and listed above satisfy NRC criteria provided in NUREG-1482. The required sampling techniques described in NUREG-1482/ Generic Letter 89-04, Position 2 are design, service condition, and valve orientation.
Groups have been populated and testing has been scheduled such that the entire group will be tested over a range of quarterly to 6 years (except for the refueling water storage tenk outlet check valves and the emergency sump check valves which will be extended to a maximum of 8 years) plus a 25% margin, l
depending on the size, safety and risk significance, and past performance of valves in the g oup. The population of the group proved to be dependent upon the total available population of the component, as well as consideration of the testing schedule that the program seeks to maintain.
The stagger test model allows trending and monitoring of the performance of components in the group to ensure that the selected test frequency is appropriate. Grouping components in %is manner and testing on l
a staggered basis over the test frequency will reduce the importance of common cause failure modes, as selected components in the same staggered failure mode group are periodically tested over the group's extended test interval, ensuring that component capability will be maintained over the test interval. The sequence of testing will be repeated to ensure the maximum amount of time between testing of a component does not exceed the 6 year test interval (except for the refueling water storage tank outlet check valves and the emergency sump check valves which will not exceed an 8 year test interval) plus a 25%
margin. Finally, SCE's RI-IST Program willincorporate the expansion criteria described in NUREG-1482, which states that if a potentially generic problem is identified during a test, all valves in the group in that unit must be inspected / tested during the refueling outage.
The valve group desianators are composed of the system, a sequential number and a unit identifier, as illustrated below.
Group Identifier 1204._032 l
WG rY J
/ \\und system sequence Note:
Consistent with plant convention, compo'1ents common to both units or grouped across units display a unit "0" group identifier l
3-9
RISK-NFORMED IST PROGRAM FOR SOUTHERN CAUFORNIA EDISON IMPLEMEi4TATIONAi4C Qv;T0% PROGRAM
' in several cases the grouping spans two systems. In these cases, the component functions meet the grouping criteria and the system designation break is arbitrary. For example, for valve groups 1208 012 l
l and 013, the charging system connects to the high pressure safety injection path through independent piping and manual isolation valves..The manual valves are identical in design and function, but they are j
l arbitrarily designated as different systems (Safety injection and Charging). Hence, combining these valves
)
as a group does not violate the grouping criteria.
In summary, the L-H or LSSC valves in any group may have the testing staggered over an extended period (e.g., up to 6-years, except for the refueling water storage tank outlet check valves and the emergency I
sump check valves which will be extended to a maximum of 8 years, plus 25% margin) based on design, service condition, performance history, risk ranking, compensatory actions (for L-H valves), and the number of valves in a group. Testing will be scheduled on a stagger test basis to ensure:
1 All valves in the group are tested at least once during the stagger test interval and, Not all components are tested at one time.
Generally, extensions for L-H and LSSC ranked components adhere to the following model (Table 3.2-1 cor,tains the stagger test interval):
VALVES PER GROUP FINAL TEST INTERVAL 1
2yr - 2A i
2 (or multiples of 2) 4yr - 4A(S) 3 (or multiples of 3) 6yr - 6A(S)
Note: The "(S)* Indicates a stagger test l
This submittal does not change the current IST program alternate testing justifications, in that testing previously identified as cold shutdown or refueling remains in a " test at shutdown" classification. The l
alternate testing justifications are available for review, if required.
The performance history of the E/H valves on the AFW pump flow path (HV4762 and HV4763) is such that this valve group did not meilt an increase in test frequency. In addition, some check valves were replaced I
with an improved design (1201MUO19 and 1201MU021), but since they have not yet accumulated adequate performance history, their test frequency will remain at the cold shutdown interval. When adequate performance history is obtained, these valves will be re-evaluated and the interval will be extended as appropriate.
3-10 L-
i RISX-INFORMEDIST P OGRAM FOR SOUTHERN CAUFORNIA EDISON IMPLEMENTATION ANO Moe4ITORING PROGRAM 3.3 Performance Monitorina ofIST Comconents in addition to the specific inservice testing proposed for each component group discussed in Section 3.1.1 l
above, the RI-IST program will perform the following additional monitoring for each component group. The additional performance monitoring actubes listed below by component type are applicable to all components within a given group regardless of individual ranking (HSSC, L-H, or LSSC).
The proposed monitoring plan is sufficient to detect component degradation in a timely manner. Further, the monitoring actMbes identified for each component group ensure that the following criteria are met:
Sufficient tests are conducted to provide meaningful data.
The inservice tests are conducted such that inc;pient degradation can reasonably be expected to be detected.
. Appropriate parameters are trended to provide reasonable assurance that the component will remain operable over the test interval.
The proposed performance monitoring plan is sufficient to ensure that degradation is not significant for components placed on an extended test interval, and that failure rates assumed for these components will not be significantly compromised. The proposed performance monitoring, when coupled with SCE's corrective action program (discussed in Section 2.4.1), ensures corrective actions are taken and timely adjustments are made to individual component test strategies where appropriate.
The SCE RI-IST Program will be reassessed at a frequency not to exceed once every other refueling outage, based on Unit 3, to reflect changes in plant configuration, component performance test results, industry experience, and other inputs to the process. Configuration changes will be assessed in concert with the current design change process. Therefore, the monitoring process for RNST is adequately coordinated with existing programs (e.g., Action Request program, Maintenance Rule monitoring, and design change process) for monitoring component performance and other operating experience on this site and, where appropriate, throughout the industry. Although the monitoring of reliability and unavailability goals for operating and standby systems / trains is required by the Maintenance Rule, it alone might not be sufficient to ensure operational readiness of components in the RI-IST program. The SONGS Action Request program requires timely operability assessment for component performance issues detected outside the auspices of the IST program. This process, coupled with the evaluations performed in
. Maintenance Rule space in concert with IST trending, ensures continued operational readiness of RHST components.
Motor-ODerated Valves (MOVs)
Actuator electricalinspections Umit switch assemblies 3-11
RIsx-INFORMED IS T PROGRAM FOR SOUTHERN CALIFORNIA EolsoM IMPLEMENTATION AND MONITORING PROGRAM Torque witch assemblies Leads, jumpers, lugs, caps, tape, space heaters, environmentally qualified (EQ) wire i
splices and cable ties Inspect terminal blocks, motor T-drains Assess motor overheating indication I
Perform motor megger Actuator lubrication inspection
)
Inspect for weeping, grease relief for function, grease level in main gear and clutch j
housing, and grease quality Add grease to stem reservoir Lubricate upper drive sleeve bearing i
1 Lubricate valve bushing via grease fitting, stem threads, and yoke legs / anti-rotation plate 1
on WKM globes Inspect stem nut for tightness and staking, actuator type SB compensator spring housing for cracks, and stem protective cover 1
Valve PM activities Other ac'ivities Perform handwheel operation l
l Visualinspection for gross irregularities, upper bearing housing cover for warping on SMB-i
- 000, Remove springpack/ worm to inspect spring pack, worm, worm gear, torque switch roller, L
grease in main housing j
Remove motor to inspect motor pinion, worm shaft gear, declutch mechanism, and grease in motor compartment Verify / tighten actuator mounting bolts, anti-lock rotation plat jam nuts Verify / adjust actuator stop nuts and monitor stem nut thread condition Relief Valves Test results trended New valves tested prior to installation
)
Valves set as close to nominal as practical Check Valves Combination of acoustic, magnetic, and/or ultrasonic testing methods are used as appropriate Data retrieved from these methods will be cc apared with previous results and the differences i
evaluated i
3-12
RISK-INFORMED IST PROGRAM FOR SOUTI4ERM CAUFORNIA EolsOM IMPLEMENTATION AMD MONITORING PROGRAM Open and close testing Check valve disassembly inspections are performed where other testing is not practicable Leak rate testing is performed by 10 CFR 50, Appendix J program Leak testing for check valve closed exercise testing where appropriate Air-Ooerated Valves (AOVs)
Static diagnostic testing performed following valve or actuator overhaul or corrective maintenance that could impact valve function or as requested
. Routine overhauls Disassembly, cleaning, inspection
]
Replacement of elastomers Re-assembly and testing e
Response time testing Valves exposed to extreme environmental conditions will have repetitive maintenance orders for actuator replacement Positioner PMs consist of the following:
Removal disassembly, cleaning, inspection Parts replacement as required Reassembly and test Dynamic testing (the following testing parameters as applicable)
Bench set, maximum pneumatic pressure, seat load, spring rate, stroke time, actual travel, total friction Setpoint of pressure switch (s) relief valve, regulator, etc.
Minimum pneumatic pressure to accomplish safety function of valve assembly Pneumatic pressure at appropriate point in operation Others as applicable e
Pumos Margin to safety limit deviations - head curves Lube oil analysis l
3-13 l
RIsx-INFORMED IST PROGRAM FOR SOUTHERM CALIFORMIA EDIsOM IMPLEMENTATION Ai40 MOe4ITORIi4G PROGRAM l
Alignment checks Motor curreni testing (recently initiated - program still developing)
Vibration monitoring Flange loading checks of connected piping - (not periodic - only performed after disassembly)
Thermography (recentlyinitiated) 3.4 Feedback and Corrective Action Procram
}
When a component with an extended test interval fails to meet established test criteria, corrective actions will be taken in accordance with the SONGS Action Request (AR) Program (the basic initiator for the corrective action program) as described below for the RI-IST program.
The SONGS AR program is initiated by component failures that are detected by the IST program, as well j
as by other mechanisms, such as normal plant operation, or inspections. For components not meeting any acceptance criteria, an AR is generated. This document initiates the corrective action process.
For example, during a " substantial flow" pump IST, the discharge check valve is effectively tested during the course of the pump test. Since the pump test can not be considered satisfactory if the check valve fails to perform its risk significant function (i.e., open), a test failure would be recorded and an AR would be initiated. The recorded information could then be used to assess whether a significant change in component reliability has occurred such that the component would merit a change in test interval.
Note, however, that the initiating AR event may be derived from causes other than an unacceptable IST test. In fact, the initiating event could be any other indication that the component is in a non-conforming condition. When an unsatisfactory condition occurs, it is evaluated to fulfill the following objectives:
(1)
Determine the impact on system operability and take appropriate action; i
(2)
Review the previous test data for the component and all components in the group, (3)
Perform a root cause analysis, as appropriate; j
(4)
Determine if the event is a generic failure. Ifit is a generic failure whose implications affect a group of components, initiate corrective action for all components in the affected group.;
(5)
Initiate corrective action for failed IST components; and I
(6)
Evaluate the adequacy of the test strategy. If a change is required, review the IST test I
l schedule and change as appropriate.
l
(
As is apparent from the AR process outlined above, the SONGS corrective action guidance and procedures achieve the following objectives:
The procedures comply with Criterion XVI," Corrective Action" as specified by Appendix B to 10 l
l l
3-14
l RISK-INFORMEO IST PROGRAM FOR SOUTHERN CALIFORMA EatsOn IMPLEMENTATIOM AND MOMITORING PROGRAM CFR Part 50.
The procedures institute a process that determines the impact of the failure or nonconforming condition on system / train operability. SCE refers to the appropriate Technical Specification when component capability cannot be demonstrated.
The procedures determine and correct the apparent or root cause of the failure or nonconforming condition (e.g., improve testing practices, repair or replace the component).
{
The procedures assess the applicability of the failure or nonconforming condition to other components in the IST program (including any test population expansion that may be required for grouped components such as relief valves).
The procedures correct other susceptible similar IST components as necessary.
The procedures consider the effectiveness of the component's test strategy (i.e., frequency and methods) in detecting the failure or nonconforming condition. They adjust the test frequency or methods or both, as appropriate, where the component (or group of components) experiences repeated or ape-related failures or nonconforming conditions.
SCE's corrective action e-ations will periodically be given to the SONGS PRA group so that any necessary model changes nd PRA component re-categorization will be incorporated as appropriate.
Performance history and r.uta, including the adequacy of compensatory measures, will be fed back through the site processes to the IST Coordinator and the RI-IST Expert Panel. In this way, any unacceptable performance will be detected early and can be factored into the program, if an ineffective test interval is detected,it will be evaluated through the corr 1ctive action programs and resolved through appropriate changes to the IST Program.
Additionally, as part of the corrective action process, the IST Coordinator will evaluate the necessity of increasing the test frequency (i.e., decreasing the time between tests) of a component (or group of components)if the cause of failure is determined to be age-related. Furthermore, the SONGS Inservice Testing Coordination and Trending Program procedure will be modified to require the evaluation of the effects of a component failure or degradation for common causes across other plant systems. Therefore, the RI-IST feedback and corrective action process is consistent with the acceptance guidelines contained in Section 3.4 of RG1.175.
- 3. 5 Periodic Reassessment As a living process, components will be reassessed at a frequency not to exceed every other refueling outage (initiated based on Unit 3 refueling outages) to reflect changes in plant configuration, component performance test results, industry experience, and other inputs to the process. The RI-IST reassessment will be conipleted within 9 months of completion of the cutage. Significant changes in plant configuration 3-15
' RISK-NFORMED IST PROGRAM FOR SOUTHERN CAUFORNIA EolsON IMPLEMEi4TATION Ar4D MONITORING PROGRAM may require a more expedient assessment. One or more such emergent modifications resulting in significant changes in the PRA model is an example that would require a more expedient assessment.
Part of this periodic reassessment will involve feedback to the PRA group. This includes information such as components tested since the last reassessment, number and type of tests, number of failures, corrective actions taken including generic implication and changed test frequencies. Once the PRA has been reassessed, risk information will be re-introduced to the Integrated Decision-making Process (IDP) for Expert Panel deliberation and confirmation of the existing lists of HSSCs, L-Hs, and L-LSSCs or modification of these lists based on the new data. As part of the IDP, confirmatory measures previously used to categorize components as L-Hs or LSSCs will be validated. Additionally, the maximum test interval will be verified or modified as dictated by the IDP.
The risk analysis performed for the initial Risk-informed IST Program will be updated every other refueling outage. As part of the update, plant-specific performance histories will be analyzed by the PRA analysts
- and incorporated into the PRA models, then component importance will be recalculated. The Expert Panel will then review the performance histories and PRA inputs and determine if any L-Hs or LSSCs should be l
re-categorized as HSSCs because of plant-specific performance, or vice versa. This approach is considered to be both prudent and conservative, since it ensures that any new IST components will be evaluated by the RI-IST process before its ASME Code test requirements are relaxed.
For each L-H (LSSCs that have a high RAW), the Expert Panel either selected a compensatory measure or I
provided justification, based on model and performance considerations, why a compensatory measure was not required. Compensatory measures are tests and other activities that could be credited to reduce the increase in core damage frequency associated with test interval changes (e.g., pump operability test or pump IST for pump discharge check valves, slave relay test for MOVs, normalinstrumentation monitoring, j
locked valve program, subgroup relay testing every 180 days per technical specifications). Compensatory measures which are used as part of the IDP process to qualitatively justify the extension of a test interval will t
be re-verified during the IDP process update.
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ENCLOSURE 3 l
The Southern California Edison Company (SCE)
Risk-Informed inservice Testing Program Description
l l
1 RISK-INFORMED INSERVICE TESTING PROGRAM DESCRIPTION The proposed alternative is a risk informed process to determine the safety significance and testing strategy of components in the ASME Section XI inservice Testing (IST)
Program, and identify non-ASME IST components (pumps & valves) modeled in the Probabilistic Risk Assessment (PRA) that are determined to be High Safety Significant j
Components (HSSCs). The process consists of the following elements.
- 1. Categorize components by Fussell-Vesely (FV) and Risk Achievement Worth (RAW) importance measures based on the San Onofre Nuclear Generating Station (SONGS) 2/3 Living PRA. (PRA Process) l l
- 2. Blend deterministic and probabilistic data to perform a final importance I
categorization of components as either Low Safety Significant Component (LSSC),
Potentially High (LH) or High Safety Significant Component (HSSC). (Integrated Decision Process - IDP)
- 3. Develop / Determine Test Frequencies and Test Methodologies for the ranked components. (Testing Philosophy)
- 4. Evaluate cumulative risk impact of new test frequencies and test methodologies to ensure risk reduction or risk neutrality. (Cumulative Risk impact)
- 5. Develop an implementation plan. (Implementation)
I
- 6. Develop a Corrective Action plan. (Corrective Action) 1
- 7. Perform periodic reassessments. (Periodic Reassessments)
J
- 8. Develop a methodology for making changes to the Risk Informed - Inservice Testing (RI-IST) program. (Changes to Rl-IST)
With these elements and their implementation, the key safety principle discussed in the Basis for Acceptance are maintained.
1 Page1of14
- 1. PRA Process PRA methodology facilitates determination of the risk significance of components based on end states of interest, such as core damage frequency (CDF) and release of radioactivity (e.g., large early release frequency (LERF)).
The full scope (internal and external events, and shutdown) PRA used to develop the importance measures is adequate for this application, and is complemented by the Integrated Decision Process (IDP). Evaluation of initiating events also includes loss of support systems and other special events such as Loss of Coolant Accident (LOCA),
Steam Generator Tube Rupture (STGR), station blackout, and Anticipated Transient without Scram (ATWS).
The PRA model used for the development of importance measures for the RI-IST was independently reviewed to ensure completeness and accuracy. Additionally, all changes to the model are formally tracked and reviewed to ensure the change is complete, accurate, appropriately implemented in the computer model, and documented.
The PRA will be periodically updated (See Section 7) to reflect the current plant design, procedures, and programs.
- 2. Component Ranking Two figures of merit will be used to initially categorize components: Fussell-Vesely (FV) and Risk Achievement Worth (RAW). For the RI-IST Program, the following criteria will be used to initially rank components for review by the Integrated Decision Process (IDP).
Category Criteria High (HSSC)
FV>0.001 Potentially High (LH)
FV < 0.001 and RAW > 2 Low (LSSC)
FV<0.001 and RAW <2 These CDF and LERF thresholds ensure that the cumulative risk impact due to changes in test frequencies are within the acceptance guidelines of Regulatory Guides 1.174.
Methodology / Decision Criteria for PRA The following describes a methodology that may be used to categorize components in the RI-IST when the program is reassessed. However, only those elements that are significantly affected by the model changes (e.g., design modifications or procedural changes) need to be reviewed in detail using this process. The scope of the review and the justification for it will be documented as part of the IDP. The following steps will be applied by the IDP:
Page 2 of 14 a) Review FV and RAW importance measures for pumps and valves considered in the PRA against the classification criteria.
b) Review component importance measures to ensure that their bases are well understood and are consistent with the SONGS specific levels of redundancy, diversity, and reliability.
PRA Limitations a) Address the sensitivity of the results to common cause failures (CCF), assuming all/none of the CCF importance is assigned to the associated component.
l b) Evaluate the sensitivity due to human action modeling. Identify / evaluate proceduralized operator recovery actions omitted by the PRA that can reduce the ranking of a component.
c) Consider industry history for particular IST components. Review such sources as NRC Generic Letters, Significant Operating Event Report (SOERs), and Technical Bulletins and rank accordingly.
d) For components with high RAW / low FV, ensure that other compensatory measures are available to maintain the reliability of the component.
e) Identify and evaluate components whose performance shows a history of causing entry into LCO conditions. To ensure that safety margins are maintained, consider retaining the ASME test frequency for these components.
LevelII(LERF)
Consider components / systems that are potential contributors to large, early release.
I Determine LERF FV and RAW for components and/or determine which would have the equivalent of a high FV or low FV /high RAW with respect to LERF and rank accordingly.
IST Components Not in PRA Review scenarios involving the "not-modeled" IST components to validate that the components are in fact low risk.
Page 3 of 14
l High-Risk PRA Components Not in the IST Program
. Identify, if any, other high risk pumps and valves in the PRA that are not in the IST program but should be tested commensurate with their importance.
Determine whether current plant testing is commensurate with the
- importance of these valves. If not, determine what test, e.g., the IST test, would be the most appropriate Other Considerations Review the PRA to determine that sensitivity studies for cumulative effects and defense in depth have been adequately addressed in the determination of component importance factors.
- 3. Integrated Decision Process The purpose of using the Integrated Decision Process (IDP) is to confirm or adjust the initial risk ranking developed from the PRA results, and to provide a qualitative assessment based on engineering judgement and expert experience. This qualitative assessment compensates for limitations of the PRA, including cases where adequate quantitative data is not available.
The IDP uses deterministic insights, engineering judgement, experience, and regulatory requirements as described above in Section 2. The IDP will review the
- initial PRA risk ranking, evaluate applicable deterministic information, and determine the final safety significance categories. The IDP considerations will be documented for each individual compcrient to allow for future repeatability and scrutiny of the categorization process.
The scope of the IDP includes both categorization and application. The IDP is to provide deterministic insights that might influence categorization. The IDP will identify components whose performance justifies a higher categorization.
The IDP will determine appropriate changes to testing strategies. The IDP will identify compensatory measures for potentially HCCSs or justify the final l-categorizat!on. The IDP will also concur on the test interval for components L
categorized as a Low Safety Significant Compenent (LSSC).
The end product of the IDP will be components categorized as LSSC, Potentially High Safety Significant (LH) or High Safety Significant Component (HSSC).
Page 4 of 14 4
L.
c l
in making these determinations, the Integrated Decision Process (IDP) ensures that key safety principles (namely defense-in-depth and safety margins), are maintained. It also ensures the changes in risk for both CDF and LERF are acceptable per the guidelines discussed in Section 2 above. The key safety principles are described below.
- Defense in Depth
. The SONGS RI-IST program ensures consistent defense in depth by maintaining i
strict adherence to seven objectives of the defense in depth philosophy described in Regulatory Guides 1.174 and 1.175. The review and documentation of these objectives are an integral feature of the IDP for future changes to the program.
Those objectives are:
- 1) A reasonable balance is preserved among prevention of core damage, prevention of containment failure, and consequence mitigation. Multiple risk metrics, including core damage frequency (CDF) and large early release frequency (LERF), will be used to ensure reasonable balance between risk end states (Objective 1).
- 2) No changes to the plant design or operations procedures will be made as part of the RI-IST program which either significantly reduces defense-in-depth, barrier independence or places strong reliance on any particular plant feature, human action, or programmatic activity (Objective 2, 5).
- 3) The methodology for component categorization, namely the selection of importance measures and how they are applied and understanding the basic reasons why components are categorized HSSC or LSSC, will be reviewed to ensure that redundancy and diversity are preserved as the more important principles. Component reliability can be used to categorize a component LSSC only when:
1) plant performance has been good, and 2) a compensatory measure or feedback mechanism is available to ensure adverse trends in equipment performance can be detected in a timely manner.
A review will ensure that test frequency relaxation in the RI-IST program occurs
. only when the level of redundancy or diversity in the plant design or operation i
supports it. In this regard, all components that have significant contributions to common cause failure will be reviewed to avoid relaxation of requirements on those components with the lowest level of diversity within the system (Objective 3,4).
Page 5 of 14
- 4) befenses against human errors are preserved by performing sensitivity studies.
Sensitivity studies will be performed for human actions to ensure that components which mitigate the spectrum of accidents are not ranked low solely because of the reliability of a human action (Objective 6).
- 5) The intent of the General Design Criteria in 10CFRPart 50, Appendix A will be maintained (Objective 7).
Other Considerations Related To Defense-In-Depth.
When the PRA does not explicitly model a component, function, or mode rf operation, a qualitative method may be used to classify the component HSSC, LH, or LSSC and to determine whether a compensatory measure is required. The qualitative method is consistent with the principles of defense in depth because it preserves the distinction between those components which have high relative redundancy and those which have only high relative reliability.
Maintain Sufficient Safety Margin The IDP will perform reviews consistent with Regulatory Guides 1.174 and 1.175 to ensure that sufficient safety margin is maintained when compared to the deterministic IST program. In performing this review, the IDP will consider such things as proposed changes to test intervals and, where appropriate, test methods.
The IDP will ensure that the proposed compensatory measures, when required by the program, are effective in maintaining adequate safety margin. To enhance the safety margin, the IDP will also review PRA important components not in the current IST program for potential inclusion in the RI-IST program.
Categorization Guidelines Modeled Components / Functions For modeled components / functions with a FV >0.001 the IDP either confirms the component categorization is HSSC or a justification of conservatism in the PRA model will be developed.
For modeled components / functions with a FV <0.001, but a RAW >2.0, the component will be categorized LH. The component may be considered LSSC provided a compensatory measure exists that ensures operational readiness and the component's performance is acceptable. If a compensatory measure is not available or the component has a history of poor performance, the component will not be considered for test interval extension and will be considered for potential test method enhancement.
s Page 6 of 14 For modeled components / functions with a FV <0.001 and a RAW <2.0, the component will be categorized as LSSC provided the component's performance has been acceptable. For those components with performance problems, a compensatory measure will be identified to ensure operational readiness or the component will be categorized as HSSC.
Non-Modeled Components / Functions For components not modeled or the safety function not modeled in the PRA, the categorization is as follows:
If the sister train is modeled then the component takes that final categorization.
If the component is implicitly modeled in the PRA, the FV and RAW are estimated and the deliberation is as discussed for modeled componentsftnctions.
If the component is not implicitly modeled, the component performance history will be reviewed. For acceptable performance history the component will be categorized as LSSC. For poor performance history, a compensatory measure will be identified to ensure operational readiness and the component categorized as LSSC, or if no compensatory measures are available, categorize the component as HSSC.
Documentation Documentation of the IDP will be available for review at the plant site. The basis for risk ranking and component grouping will be entered in the IST data system.
4, Testing Philosophy Motor Operated Valves (MOVs)
HSSC Testing will be performed in accordance with Code Case OMN-1, and NRC Generic Letter 89-10 and 96-05 commitments. MOV's with a passive function will be tested per the Code of Record as defined in 10CFR50.55a.
Seat leakage testing, if required, will be per the Code of record.
LH Testing will be performed in accordance with Code Case OMN-1 and NRC Generic Letter 89-10 and 96-05 commitments at an initial interval not to exceed 6 years until sufficient data exist to determine a more appropriate test frequency. MOV's with a passive function will be tested per the Code of Page 7 of 14 3
Record, except at a test frequency not to exceed 6 years (with a 25%
margin) based on evaluation of design, service condition, performance history, and compensatory actions Seat leakage testing, if required, will be per the Code of record, except at a test frequency not to exceed 6 years (with.a 25% margin).
LSSC Testing will be performed in accordance with Code Case OMN-1, and NRC Generic Letter 89-10 and 96-05 commitments at an initial interval not to exceed 6 years until sufficient data exist to determine a more appropriate test frequency. MOV's with a passive function will be tested per the Code of Record, except at a test frequency not to exceed 6 years (with a 25%
margin). Seat leakage testing, if required, will be per the Code of record, except at a test frequency not to exceed 6 years (with a 25% margin).
Relief Valves Testing of relief valves will continue to be conducted in accordance with the Code of record (OM-1) with no change in test interval. The Southern California Edison Company (SCE) believes that relief valve performance as a whole does not warrant interval extension. In the future, should performance history change, SCE will rank valves per the Integrated Decision-making Process (lDP) and extend intervals I
accordingly. The initial testing stcategy will be:
HSSC Testing will be performed in accordance with the Code of Record as defined in 10CFR50.55a.
LH Testing will be performed in accordance with the Code of Record as defined in 10CFR50.55a.
LSSC Testing will be performed in accordance with the Code of Record as defined in 10CFR50.55a Check Valves HSSC Testing will be performed in accordance with the ASME Code of Record as defined by 10CFR50.55a.
LH Testing will be performed in accordance with the ASME Code of Record as i
required by 10 CFR 50.55a except, based on evaluation of design, service condition, performance history, and compensatory actions, the test frequency may be extended not to exceed 6 years plus a 25% margin, Page 8 of 14 except for the refueling water storage tank outlet check valves and the emergency sump outlet check valves which may be extended not to exceed 8 years plus a 25% margin.'
LSSC Testing will be performed in accordance with the ASME Code of Record as defined by 10CFR50.55a except at a test frequency not to exceed 6 years (with 25% margin).
In addition, the interval for exercise testing for certain check valves with Appendix J local leak rate testing requirements will be assigned consistent with Appendix J, Option B criteria.
Air Operated Valves (AOVs)
HSSC Testing will be performed in accordance with the Code of Record as defined by 10CFR50.55a.
LH Testing will be performed in accordance with the Code of Record as required by 10CFR50.55a except based on evaluation of design, service condition, performance history, and compensatory actions, the test frequency may be extended not to exceed 6 years plus a 25% margin.
Additionally L-H AOVs will be stroked at least once during each operating cycle.
LSSC Testing will be performed in accordance with the Code of Record as defined by 10CFR50.55a except with a test frequency not to exceed 6 years (with 25% margin). Additionally, LSSC AOVs will be stroked once during the operating cycle.
Note: Currently certain AOVs are tested using diagnostic equipment. SONGS is participating in a Joint Owners Group effort to develop an AOV program similar to the MOV Program mandated by GL 89-10 and 96-05. This program will evaluate the valve / operator characteristics / capabilities and the design conditions under which the valve is expected to operate. Once this information is developed it will be evaluated and implemented as appropriate.
Hydraulic Valves (E/H), Solenoid Valves, and Others (Manual Valves, etc.)
SCE proposes to test these valves in accordance with the Code of Record (OM-10) with the exception that the test frequency will be in accordance with the component risk categorization defined below:
Page 9 of 14
HSSC Testing will be performed in accordance with the Code of Record as required by 10CFR50.55a.
LH Testing will be performed in accordance with the Code of Record as required by 10 CFR 50.55a except based on evaluation of design, service condition, performance history, and compensatory actions, the test frequency may be extended not to exceed 6 years plus a 25% margin.
LSSC Testing will be performed in accordance with the Code of Record as required by 10 CFR 50.55a except based on evaluation of design, service condition, and performance history, the test frequency may be extended not to exceed 6 years plus a 25% margin.
Pumps Pumps will be tested in accordance with the Code of Record (OM-6) with the exception that the test frequency may be in accordance with the component risk categorization defined below:
HSSC Testing will be performed in accordance with the Code of Record as required by 10 CFR 50.55a. Additionally, Code testing will be augmented with periodic oil analysis and thermography. A motor current monitoring program is in the development stage. Once implemented, HSSC pumps will be included in the scope of that program.
LH Testing will be performed in accordance with the Code of Record as required by 10 CFR 50.55a except based on evaluation of design, service condition, performance historv. and compensatory actions, the test frequency may be extended not exceed 6 years plus a 25% margin.
LSSC Testing will be performed in accordance with the Code of Record as required by 10 CFR 50.55a except the test frequency may be extended not to exceed 6 years plus a 25% margin.
- 5. Implementation Implementation of the Rl-IST to LSSC will consist of grouping components and then staggering the testing of the group over the test frequency.
Page 10 of14
Grouping:
Components will generally be grouped based on:
System Component type (MOV, AOV, Check Valve, etc.)
Manufacturer
. Size Style (globe, gate, swing check, tilt disk, etc.)
Application (pump discharge, flow path, orientation, etc).
The population of the group will be dependent on:
total population available e
maintaining current testing schedule e
Grouping components in this manner and testing on a staggered basis over the test interval reduces the importance of common cause failure modes since at least one valve in the group is tested during each cycle.
Testing of components within the defined group will be staggered over the test interval, typically 6 years. Testing will be scheduled on regular intervals over the test interval to ensure all components in the group are tested at least once during the interval, the same component is not tested repeatedly, while deferring others in the group, and not all components are tested at one time. The staggering allows the trending of wmponents in the group to ensure the test frequency selected is appropriate.
Testing will be scheduied / planned such that there is no more than one cycle between tests of components in a group.
- 6. Corrective Action When an LSSC (including L,H) on the extended test interval fails to meet established test criteria, corrective actions will be taken in accordance with the SONGS corrective action program as described below for the RI-IST.
For all components not meeting the acceptance criteria, an Action Request (AR) will be generated. This document initiates the corrective action process. An AR may Page11of14 i
result from activities other than IST that identify a degradation in performance.
The initiating event could be any other indications that the component is in a non-conforming condition. The unsatisfactory condition will be evaluated to:
a) Determine the impact on system operability since the previous test.
b) Review the previous test data for the component and all components in the group.
c) Perform a root cause analysis.
d) Determine if this is a generic failure. If it is a generic failure whose implications affect a group of components, initiate corrective action for all components in the affected group.
e) Initiate corrective action for failed IST components.
f) Evaluate the adequacy of the test interval. If a change is required, review the IST test schedule and change as appropriate.
The results of component testing will be provided to and reviewed by the PRA group for potential impact to a PRA model update. The PRA model will be updated as necessary with changes tracked and documented per the PRA Change Process Program.
For an emergent plant modification, any new IST component added will initially be included at the current Code of Record test frequency Only after evaluation of the component through the RI-IST Program (i.e., PRA model update if applicable and IDP review) will this be considered LSSC with an extended test interval..
- 7. Periodic Reassessment As a living process, components will be reassessed at a frequency not to exceed every other refueling outage (based on Unit 3 refueling outages) to reflect changes in plant configuration, component performance test results, industry experience, and other inputs to the process. The RI-IST reassessment will be completed within 9 months of completion of the outage.
Part of this periodic reassessment will be a feedback loop of information to the PRA.
This will include information such as components tested since the last reassessment, number and type of tests, number of failures, corrective actions Page 12 of14
q l
l taken including generic implication, and changed test frequencies. Once the PRA has been reassessed, the information will be brought back to the IDP for deliberation and confirmation of the existing lists of HSSCs and LCCSs or modification of these lists based on the new data, if required. As part of the IDP, f
confirmatory measures previously used to categorize components as LSSC as well 1
as compensatory measures used to justify the extension of LH components will be i
validated. Additionally, the maximum test interval will be verified or modified as dictated by the IDP.
I
- 8. Changes to RI-IST Changes to the process described above (such as acceptance guidelines used for the IDP) as well as changes in test methodology issues that involve deviation from NRC endorsed Code requirements, NRC endorsed Code Case, or published NRC j
guidance are subject to NRC review and approval prior to implementation. Other i
changes using the process detailed above (such as relative ranking, risk categorization, and grouping) are subject to site procedures and the associated change process pursuant to 10CFR50.59.
SONGS will periodically submit changes to the NRC for their information.
Notes:
1 The refueling water storage tank (RWST) and emergency sump outlet check valves currently comprise 2 cross unit valve groups: 1) S2(3)1204MU001 and S2(3)1204MU002, and 2) S2(3)1204MU003, and S2(3)1204MU004. All eight valves are 24 inch Mission Duo-Check split disk check valves. Testing is currently scheduled on a 6 year staggered test interval consisting of a disassembly, inspection, and hand stroke. Extending the test interval to 8 years on these 2 valve groups is reasonable given the valve history, and does not result in an interval w hich would allow degradation without prior detection. The results of the inspections indicate there is little, if any, wear over the initial 15 years of operation.
These inspections validate the wear predictions calculated using the CVAP wear analysis software developed by Kalsi Engineering. The process of draining the 350 feet of 24 inch header piping (~8000 gallons) through % inch drain, removing the two valves (one from each group), and hand stroking requires several days. Once the header is re-filled, I
the venting operation requires multiple start-stop cycles on each of the high pressure injection, low pressure injection, l
and containment spray pumps on the panicular train, and is extremely resource intensive. In addition, there is l
significant dose accumulation associated with disassembly, inspection, and subsequent post maintenance test activities.
)
To support a partial flow test of the sump check valves, the sump must be cleaned, then partially filled. The partial flow activity uses a low pressure injection pump for a shon duration partial flow through the check valve. Due to the limited volume available in the sump, the pump run is very short in duration and requires exclusive attention in the control room during preparation and execution.
The RWST valves are partially opened for the quarterly pump inservice tests, and the sump valves are only exercised during the course of the hand stroke. A search of the Nuclear Plant Reliability Data System (NPRDS) data archives show s there are no records of failures of this valve style (Mission check valves) in this application. The recorded Page 13 of 14 L
I L
l NPRDS failures typically pei1ain to seat leakage increases, but do not involve failures to close. The NPRDS crents primarily concern inservice water systerns which have higher service duty than refueling water storage tank and
- cinergency surup outlet check valves. Given this fact, coupled with the above discussion, extending the test interval to 8 years on these 2 valve groups is reasonable and does not result in an interval w hich would allow degradation without prior detection.
l l
l L
Page 14 of 14 L.
ENCLOSURE 4 l
The Southern California Edison Company (SCE)
Risk-informed Inservice Testing Program Valve Design Basis Margin Tables
ENCLOSURE 4 Table of Contents Table 1 A:
Thrust Ma'rgin Assessment for Unit 2 Gate Valves Table 2A:
Thrust Margin Assessment for Unit 3 Gate Valves Table 3A:
Thrust Margin Assessment for Unit 2 Globe Valves Table 4A:
Thrust Margin Assessment for Unit 3 Globe Valves Table SA:
Thrust Margin Assessment for Unit 2 & 3 Butterfly Valves Table 6A:
Thrust Margin Assessment for Unit 2 & 3 R/R Globe Valves Appendix 1: Definition of Terms I
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ENCLOSURE 4
' APPENDIX 1 Definition of Terms i
I i
GATE VALVE MARGIN ASSESSMENT SPREADSHEETDEFINITIONS i
Valve ID: This field in the margin assessment identifies tag numbers of each gate valve included in the GL 89-10 and 96-05 population.
GPA No: This field in the margin assessment identifies the group performance assessment (GPA) number for each valve. Group performance assessments were performed to summarize available test data for a population group in accordance with GL 89-10 Supplement 6. Test data was evaluated to provide confirmation of assumed design basis inputs such as valve factor, stem factor and rate of load.
Valve Size: This field in the margin assessment identifies the valve body ste.
Disc Type: This field in the margin assessment identifies the disc type of the valve. There are four different types of discs in the gate valve population. The disc types are split, solid, flex, and double disc.
Mfg: This field in the margin assessment identifies the manufacturer of the subject valve.
Design Basis Open Valve Factor (VFo): This field in the margin assessment identifies the bounding open valve factor as determined by the applicable GPA and utilized in the setpoint calculation for determination of the design basis thrust requirements. Actual in-situ valve factor may be significantly lower but no higher.
Design Basis Close Valve Factor (VFc): This field in the margin assessment identifies the bounding closing valve factor as determined by the applicable GPA and utilized in the setpoint calculation for determination of the design basis thrust requirements. Actual in-situ valve factor may be significantly lower but no higher.
I As-Left Stem Factor at CST (SF'al): This field in we margin assessment identifies the adjusted valve stem factor at control switch trip as determined from as-left static testing.
The stem factor is calculated from the as-left baseline static test and includes adjustments for instrument inaccuracy. If valve specific test data in unavailable, the bounding stem factor from the applicable GPA is specified.
Stem Factor Degradation Allowance (SFD): For the purpose of margin assessment, all valves have a stem factor degradation allowance of 5% specified. This margin is include to accommodate potential changes in stem factor between maintenance intervals. Periodic testing performed to date has shown this value to be conservative given the current 1 cycle PM interval for stem lubrication.
Rate of Loading Factor (ROL): This field in the margin assessment identifies the rate of loading factor assumed in the margin assessments. This factor was calculated in the GPA's and has been included as a multiplier to the required opening and closing thrust requirements of the margin assessments. As part of the GL 89-10 closecut inspection, when determining available margin, SONGS agreed to apply a ROL value no less than 10% for all gate valve regardless of in-situ test data which suggested a lower value was appropriate.
Page 1 of 17
)
GATE VALVE MARGIN ASSESSMENT SPREADSHEET DEFINITIONS (cont'd)
As-Left Packing Load (Fpi,al): This field in the margin assessment identifies the average valve packing load as determined by static in-situ testing. If valve specific test data in unavailable, the bounding packing load assumed in the MOV setpoint calculation is specifiedc Valve Seat Area (Ast): This, field in th,e margin assessment identifies the valve seat area as specified in the MOV setpoint calculation and used when evaluating dynamic test data in order to determine valve factors.
Valve Lower Stem Area (Asml): This field in the margin assessment identifies the valve lower stem area as specified in the MOV setpoint calculation and is used to calculate stem rejection forces.
Valve Stem and Disc Weight (Wsd): This field in the margin assessment identifies the combined weight of the valve stem and disc.
Maximum Expected Closing Line Pressure (MELPoc): This field in the margin assessment identifies the maximum expected closing line pressure as calculated by the GL 89-10 Operating Basis Calculations (CBC).
Maximum Expected Opening Line Pressure (MELPco): This field in the raargin assessment identifies the maximum expected opening line pressure as calculated by the GL 89-10 Operating Basis Calculations (OBC).
Maximum Expected Closing Differential Pressure (MEDPoc): This field in the margin assessment identifies the maximum expected closing differential pressure as calculated by the GL 8910 Operating Basis Calculations (OBC).
Maximum Expected Opening Differential Pressure (MEDPco): This field in the margin assessment identifies the maximum expected opening differential pressure as calculated by the GL 89-10 Operating Basis Calculations (OBC).
Closing Seat Cont:ol Logic: This field in the margin assessment identifies the closing seat control logic. A MOV will be either torque seated (TS), bypass seated (BS), or limit seated (LS).
Seismic Force (Fse): This field in the margin assessment identifies the seismic force value used in the MOV setpoint calc. Seismic force is calculated by multiplying the stem and disc weight by the maximum seismic acceleration anticipated for a given valve under a seismic event.. This load is conservatively included in determination of the minimum required opening and closing thrust.
Available Operator Opening Torque (Tavo): This field in the margin assessment identifies the design basis available opening output 'orque of the actuator at degraded voltage. This value is identified in the MOV setpoint calculation.
Page 2 of 17 i
l i
I
' GATE VALVE MARGIN ASSESSMENT SPREADSHEET DEFINITIONS (cont'd)
~ Available Operator Closing Torque (Tavc): This field in the margin assessment identifies the design basis available closing output torque of the actuator at degraded voltage. This value is identified in the MOV setpoint calculation.
As-Left Static Torque at CST (Tcst,al): This field in the margin assessment identifies the I
actuator output torque at control switch trip from the as-left static baseline test and does not include any adjustments for diagnostic accuracy.
As-Left Static Thrust at CST (Fest,al): This field in the margin assessment identifies the actuator output thrust at control switch trip from the as-left static baseline test and does not include any adjustments for diagnostic accuracy.
Torque Switch Repeatability (TSR): This field in the margin assessment identifies the actuator torque switch repeatability based on the actuator output torque and the close torque switch setting from the as-left static baseline test. The values of TSR are specified by Limitorque and range from 0.05 to 0.20. TSR is only applicable to torque seated valves.
Spring Pack Relaxation (SPR): This field in the margin assessment identifies the maximum expected spring pack relaxation which could affect actuator output. The maximum value of SPR is 3.2% or 0.032 based on review of Limitorque bulletins. SPR is only applicable to torque seated valves.
Max Strain Gage Error (Ef): This field in the margin asse.ssment identifies the strain gage error associated with the installed strain gage used to obtain actuator output thrust values.
Stum mounted strain gages have a specified error of 11% and yoke mounted gages have a specified error of 16%.
Torque Curve Error (Et): This field in the margin assessment identifies the calibrated springpack curve torque error specified by the springpack calibration equipment manufacturer (B&W). The error associated with determining actuator output torque from springpack displacement is a function of Et and the torque at control switch trip.
TMD Read Error (Etmd): This field in the margin assessment identifies the error associated with the measurement of the springpack displacement. A displacement monitoring transducer supplied by MOVATS is installed to measure springrack displacement. The error value is specified by MOVATS.
Data Acquisition Module Error (Edam): This field in the margin assessment identifies the error associated with the MOVATS data acquisition module. The error value is specified by MOVATS.
Page 3 of 17
GATE VALVE MARGIN ASSESSMENT SPREADSHEET DEFINITIONS (cont'd)
Adjusted As-Left Static Torque at CST (T' cst,al): This field in the margin assessment identifies the as-left actuator output torque at CST for the baseline static test with adjustments for inaccuracies. The applied inaccuracies include the square root sum of squares for torque switch repeatability, torque curve error, springpack relaxation, MOVATS DMT and DAM read inaccuracies. The T'est,al value is calculated within the spreadsheet and the equation is shown oripage 3 of the table.
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Adjusted As-Left Static Thrust at CST (F'est,al): This field in the margin assessment identifies the as-left actuator output thrust at CST for the baseline static test with adjustments for inaccuracies. The applied inaccuracies include the square root sum of squares for torque switch repeatability, strain gage error, and springpack relaxation.
Acquisition errors are included as part of the overall strain gage error and not included seperately. The F'est,al value is calculated within the spreadsheet and the equation is shown on page 3 of the table.
Minimum Required Design Basis Opening Thrust (Fmino(DB)): This field in the margin assessment identifies the calculated minimum required opening thrust at design basis condition based on as-left test and design basis data. The Fmino(DB) value is calculated within the spreadsheet and the equation is shown on page 3 of the table. Refer to the spreadsheet for equation details.
j Minimum Required Design Basis Closing Thrust (Fminc(DB)): This field in the margin assessment identifies the calculated minimum required closing thrust at design basis condition based on as-left test and design basis data. The Fminc(DB) value is calculated within the spreadsheet and the equation is shown on page 3 of the table. Refer to the spreadsheet for equation details.
Adjusted As-Left Available Design Basis Opening Thrust (F'avo(DB)): This field in the margin assessment identifies the calculated as-left available opening thrust based on the available opening torque (Tavo) divided by the adjusted as-left stem factor (SF'al) as shown on page 3 of the table. This value is calculated by the spreadsheet. Refer to the spreadsheet for equation details.
Adjusted As-Left Available Closing Thrust (F' ave,al): For torque seated valves, this field identifies the maximum available closing thrust at CST from the as-left static baseline test and is equal to F'est,al. For limit seated valves (LS and BS), F'avc,al is calculated from the as-left available closing torque (Tavc) divided by the adjusted as-left stem factor (SF'al). These equations are shown on page 3 of the table. This value is calculated by the spreadsheet. Refer to the spreadsheet for equation details.
Limiting Allowable Open Valve Factor (VFlimo): This field in the margin assessment identifies the limiting open valve factor. Based on available open thrust margin, a maximum allowable valve factor is calculated This field identifies the highest permissible valve factor which could be permitted without increasing the minimum required opening thrust beyond the available actuator opening thrust. This value is calculated by the spreadsheet. Refer to the spreadsheet for equation details.
Page 4 of 17
l GATE VALVE MARGIN ASSESSMENT SPREADSHEET DEFINITIONS (cont'd) l Limidng Allowable in-Situ Opening Valve Factor (VFlimo): This field in the margin assessment identifies the limiting open valve factor. Based on available close thrust margin, a maximum allowable valve factor is calculated. This field identifies the highest permissible valve factor which could be permitted without increasing the minimum required closing thrust beyond the available actuator closing thrust. This value is calculated by the spreadsheet. Refer to the page 3 of the spreadsheet for equation details, i
Limiting Allowable in-Situ Close Valve Factor (VFlimc): This field in the margin assessment identifies the I;miting close valve factor. Based on available close thrust margin, a maximum allowable valve factor is calculated. This field identifies the highest permissible valve factor which could be permitted without increasing the minimum required 1
closing thrust beyond the available actuator closing thrust. This value is calculated by the spreadsheet. Refer to page 3 of the spreadsheet for equation details.
Opening Design Basis Thrust Margin (Fmargo(DB)): This field in the margin assessment identifies the available as-left design basis opening thrust margin based on the calculated minimum required opening thrust (Fmino,(DB)) and the available opening 1
thrust (F'avo(DB)). This value is calculated by the spreadsheet. Refer to the spreadsheet for equation details.
I Closing Design Basis Thrust Margin (Fmargc(DB)): This field in the margin assessment identifies the available ashft design basis closing thrust margin based on the calculated minimum required closing thrust (Fminc,(DB)) and the available closing thrust (F'avc(DB)).
This value is calculated by the spreadsheet. Refer to the spreadsheet for equation details.
Page 5 of 17 w
GLOBE VALVE MARGIN ASSESSMENT SPREADSHEET DEFINITIONS Valve ID: This field in the margin assessment identifies tag numbers of each globe valve included in the GL 89-10 and 96-05 population.
Valve Size: This field in the margin assessment identifies the valve body size.
Disc Type: This field in the margin assessment identifies the disc type of the valve. Disc types include unbalanced (UNB), balanced (BAL), flow under seat (FUS), and flow over seat (FOS).
Mfg: This field in the margin assessment identifies the manufacturer of the subject valve.
Effective DP Dice Area (Aeff): This field in the margin assessment identifies the effective disc area subject to DP forces. This value is the bounding area as determined by in-situ dynamic testing. Multiplying the maximum differential pressure and the effective area will conservatively predict the maximum forces required to overcome differential pressure loads. Use of Aeff eliminates the need to include a typical valve factor type multiplier.
As-Left Stem Factor at CST (SF'al): This field in the margin assessment identifies the j
adjusted valve stem factor at control switch trip from as-left static testing. The stem factor is calculated from the as-left baseline static test and includes adjustments for instrument inaccuracy. If valve specific test data in unavailable, the bounding stem factor from the applicable GPA is specified.
Stem Factor Degradation Allowance (SFD): For the purpose of margin assessment, eell valves have a stem ft.ctor degradation allowance of 5% specified. This margiri is include to accommodate potential changes in stem factor between maintenance intervals. Periodic testing performed to date has shown this value to be conservative given the current 1 cycle PM interval for stam lubrication.
Rate of Loading Factor (ROL): This field in the margin assessment identifies the rate of loading factor assumed in the margin assessments. This factor was calculated in the GPA's and has been included as a multiplier to the required opening and closing thrust requirements of the margin assessments.
As-Left Average Packing Load (Fapl,al): This field in the margin assessment identifie>.
the average valve packing load as determined by static in-situ testing. If valve specific test data in unavailable, the bounding packing load assumed in the MOV setpoint calculation is specified.
Sealing Force (Fsf): This field in the margin assessment identifies the seat sealing force specified by the MOV setpoint calculation. This force is added to the minimum required closing thrust in order to assure that adequate sealing force is provided for valves with Category A seat leakage requirements.
Page 6 of 17
i GLOBE VALVE MARGIN ASSESSMENT SPREADSHEET DEFINITIONS (cont'd)
Valve Stem Weight (Wstem): This field in the margin assessment identifies the valve stem weight as specified in the MOV setpoint calculation.
Valve Disc Weight (Wdisc): This field in the margin assessment identifies the valve disc weight as specified in the MOV setpoint calculation.
Valve Lower Stem Area (Asmi): This. field in the margin assessment identifies the valve lower stem area as specified in the MOV setpoint calculation and is used to calculate stem rejection forces.
Maximum Expected Opening Line Pressure (MELPco): This field in the marD n i
assessment identifies the maximum apected opening line pressure as calculated by the GL 89-10 Operating Basis Calculations (OBC).
Maximum Expected Closing Line Pressure (MELPoc): This field in the margin assessment identifies the maximum expected closing line pressure as calculated by the GL 89-10 Operating Basis Calculations (OBC).
Maximum Expected Opening Differential Pressure (MEDPco): This field in the margin assessment identifies the maximum expected opening differential pressure as calculated by the GL 89-10 Operating Basis Calculations (OBC).
Maximum Expected Closing Differential Pressure (MEDPoc): This field in the margin assessment identifies the maximum expected closing differential pressure as calculated by the GL 8910 Operating Basis Calculations (OBC).
Required Opening Differential Pressure Force (Fdpo): This field in the margin assessment identifies the required opening stem thrust due to design basis differential pressure only. This value is obtained from the MOV setpoint calculation and, if applicable, is equal to the effective disk area (Aeff) times the opening differential pressure (MEDPeo).
NOTE: Fdpo is not applicable to all globe valve configurations. For example, if a globe valve teds to open with pressure (i.e. FUS), the value for Fdpo will be zero.
Required Closing Differential Pressure Force (Fdpc): This field in the margin assessment identifies the required closing stem thrust due to design basis differential pressure only. This value is obtained from the MOV setpoint calculation and, if applicable, is equal to the effective disk area (Aeff) times the closing differential pressure (MEDPoc).
NOTE: Fdpc is not applicable to all globe valve configurations. For example, if a globe valve tends to close with pressure (i.e. FOS), the value for Fdpc will be zero.
Seismic Force (Fse): This field in the margin assessment identifies the seismic force value used in the MOV setpoint calc. Seismic force is calculated by multiplying the stem and disc weight by the maximum seismic acceleration anticipated for a given valve under a seismic event. This load is conservatively included in determination of the minimum required opening and closing thrust.
Page 7 of 17
GLOBE VALVE MARGIN ASSESSMENT SPREADSHEET DEFINITIONS (cont'd)
Available Operator Opening Torque (Tavo): This field in the margin assessment identifies the design basis available opening output torque of the actuator at degraded voltage. This value is identified in the MOV setpoint calculation.
Available Operator Closing Torque (Tavc): This field in the margin assessment identifies the design basis available closing output torque of the actuator at degraded voltage. This value is identified in the MOV setpoint calculation.
As-Left Static Torque at CST (Tcst,al): This field in the margin assessment identifies the actuator output torque at control switch trip from the as-left static baseline test and does not include any adjustments for diagnostic accuracy.
As Left Static Thrust at CST (Fest,al): This field in the margin assessment identifies the actuator output thrust at control switch trip from the as-left static baseline test and does not include any adjustments for diagnostic accuracy.
Torque Switch Repeatability (TSR): This field in the margin assessment identifies the actuator torque switch repeatability based on the actuator output torque and the close torque switch setting from the as-left static baseline test. The values of TSR are specified by Lim; torque and range from 0.05 to 0.20. TSR is only applicable to torque seated valves.
Spring Pack Relaxation (SPR): This field in the margin assessment identifies the maximum expected spring pack relaxation which could affect actuator output. The maximum value of SPR is 3.2% or 0.032 based on review of Limitorque bulletins. SPR is only applicable to torque seated valves.
Max Strain Gage Error (Ef): This field in the margin assessment identifies the strain gage error associated with the installed strain gage used to obtain actuator output thrust values.
Stem mounted strain gages have a specified error of 11% and yoke mounted gages have a specified error of 16%.
Torque Curve Error (Et): This field in the margin assessment identifies the calibrated springpack curve torque error specified by the springpack calibration equipment manufacturer (B&W). The error associated with determining actuator output torque from springpack displacement is a function of Et and the torque at control switch trip.
TMD Read Error (Etmd): This field in the margin assessment identifies the error asacciated with the measuremen't of the springpack displacement. A displacement monitoring transducer supplied by MOVATS is installed to measure springpack displacement. The error value is specified by MOVATF Data Acquisition Module Error (Edam): This field in the margin assessment identifies the error associated with the MOVATS data acquisition module. The error value is specified by MOVATS.
Page 8 of 17
GLOBE VALVE MARGIN ASSESSMENT SPREADSHEET DEFINITIONS (cont'd)
Adjusted As-Left Static Torque at CST (T' cst,al): This field in the margin assessment identifies the as-left actuator output torque at CST for the baseline static test with adjustments for inaccuracies. The applied inaccurscies include the square root sum of squares for torque switch repeatability, torque curve error, springpack relaxation, MOVATS DMT and DAM read inaccuracies. The T'est,al value is calculated within the spreadsheet and the equation is shown on page 3 of the table.
Adjusted As Left Static Thrust at CST (F' cst,al): This field in the margin assessment identifies the as-left actuator output thrust at CST for the baseline static test with q
adjustments for inaccuracies. The applied inaccuracies include the square root sum of squares for torque switch repr stability, strain gage error, and springpack relaxation.
Acquisition errors are included as part of the overall strain gage error and not included seperately The F'est,al value is calculated within the spreadsheet and the equation is shown on page 3 of the table.
l Minimum Required Design Basis Opening Thrust (Fmino(DB)): This field in the margin assessment identifies the calculated minimum required opening thrust at design basis condition based on as-left test and design basis data. The Fmino(DB) value is calculated within the spread' sheet and the equation is shown on page 3 of the table. Refer to the spreadsheet for equation details.
Minimum Required Design Basis Closing Thrust (Fminc(DB)): This field in the margin assessment identifies the calculated minimum required closing thcust at design basis condition based on as-left test and design basis data. The Fminc(DB) value is calculated within the spreadsheet and the equation is shown on page 3 of the table. Refer to the spreadsheet for equation details.
Adjusted As-Left Available Design Basis Opening Thrust (F'avo(DB)): This field in the margin assessment identifies the calculated as-left available opening thrust based on the available opening torque (Tavo) divided by the adjusted as-left stem factor (SF'al) as shown on page 3 of the table. This value is calculated by the spreadsheet. Refer to the spreadsheet for equation details.
Adjusted As-Left Available Closing Thrust (F' ave,al): For torque seated valves, this field identifies the maximum available closing three et CST from the as-left static baseline test and is equal to F'est,al. The equation is shown on page 3 of the table. This value is calculated by the spreadsheet. Refer to the spreadsheet for equation details.
Opening Design Basis Thrust Margin (Fmargo(DB)): This field in the margin assessment identifies the available as-left design basis opening thrust margin based on the calculated minimum required opening thrust (Fmino,(DB)) and the available opening thrust (F'avo(DB)).
This value is calculated by the spreadsheet. Refer to tha spreadsheet for equation details.
Closing Design Basis Thrust Margin (Fmargc(DB)): This field in the margin assessment identifies the available as-left design basis closing thrust margin based on the calculated minimum required closing thrust (Fminc,(DB)) and the available closing thrust (F'avc(DB)).
This value is calculated by the spreadsheet. Refer to the spreadsheet for equation details.
Page 9 of 17
BUTTERFtY VALVE MARGIN ASSESSMENT SPREADSHEET DEFINITIONS Valve ID: This field in the margin assessment identifies tag numbers of each butterfly valve included in the GL 89-10 and GL 96-05 population.
Valve Size: This field in the margin assessment identifies the valve body size.
Disc Type: This field in the margin assessment identifies the disc type of the valve. There are two different types of discs in the butterfly valve population. The disc types include model 9220 which is a double offset disc and'a model 7600 which is a symmetrical disc.
Manufacturer: This field in the margin assessment identifies the manufacturer of the subject valve. For butterfly valves, Fisher is the only manufacturer.
Seat Control Logic: This field in the margin assessment identifies the closing seat control logic. A MOV will be either torque seated (TS), bypass seated (BS), or limit seated (LS).
Maximum Expected Line Pressure (MELP): This field in the margin assessment identifies the maximum expected line pressure as calculated by the GL 89-10 Operating Basis Calculations (OBC). For butterfly valves no differentiation between opening or closing pressure is made, the bounding value is always specified.
Maximum Expected Differential Pressure (MEDP): This field in the margin assessment identifies the maximum expected differential pressure as calculated by the GL 89-10 Operating Basis Calculations (OBC). For butterfly valves no differentiation between opening or closing is made, the bounding value is always specified.
Maximum Flow (Qobc): This field in the margin assessment identifies the maximum expected flowrate as calculated by the GL 89-10 Operating Basis Calculations (OBC).
Design Basis Static Running Torque (Trun(DB)): This field in the margin assessment identifies the static torque running load (in terms of stem output torque) assumed in the MOV setpoint calculation. The static torque load includes packing and bushing loads based on vendor guidelines.
l Design Basis Required Seating / Unseating Torque (Ts(DB)): This field in the margin I
assessment identifies the required stem torque to seat and unseat the butterfly valve under design basis conditions. This value is calculated in the MOV setpoint calculation.
i Design Basis Required Dynamic Torque (Td(DB)): This field la the marg;n assessment identifies the required stem torque to stroke the butterfly valve fully open or close under design basis conditions. The dynamic torque does not include the seating torque. This value i
I is calculated in the MOV setpoint calculation.
Design Basis Minimum Required Stem Torque (Tmin(DB)): This field in the margin assessment identifies the greater of the seating / unseating torque and the dynamic torque at design basis conditions. This value is obtained from the MOV setpoint calculation..
j Page 10 of 17
BUTTERFLY VALVE MARGIN ASSESSMENT SPREADSHEET DEFINITIONS (cont'd)
Maximum Allowable Opening Torque (Tmaxo): This field in the margin assessment identifies the design basis available opening output torque of the actuator at degraded voltage. This value is identified in tne MOV setpoint calculation.
Maximum Allowable Closing Torque (Tmaxc): This field in the margin assessment identifies the design basis available closing output torque of the actuator at degraded voltage. This value is identified in the MOV setpoint calculation.
t As-Left Static Stem Torque at CST (Test,al): This field in the margin assessment identifies the actuator output torque at control switch trip from the as-left static baseline test. This output torque is limited by the torque switch setting for TS valves only and does not include adjustment for instrument inaccuracy. As-left values specified for LS valves is for information only.
As-Left Average Static Running Torque (Trun,al): This fMd in the margin assessment identifies the average static running torque measured during basehne ::,tatic testing. The static torque load includes packing and bushing loads and is obtained from the static test data reconciliation. If in-situ test data is unavailable, the setpoint calc value is specified as the default.
Torque Switch Repeatability (TSR): This field in the margin assessment identifies the actuator torque switch repeatability based on the actuator output torque and the close torque switch setting from the as-left static baseline test. The values of TSR are specified by Limitorque and range from 0.05 to 0.20. TSR !c only applicable to torque seated valves.
Spring Pack Relaxation (SPR): This field iri the margin assessment identifies the maximum expected spring pack relaxation which could affect actuator output. The maximum value of SPR is 3.2% or 0.032 based on review of Limitorque bulletins. SPR is only applicable to torque seated valves.
Max Strain Gage Error (Ef): This field in the margin assessment identifies the strain gage error associated with the installed strain gage used to obtain actuator output thrust values.
Stem mounted strain gages have a specified error of 11%. All butterfly valves use stem mounted ' strain gages.
As-Left Minimum Required Opening Stem Torque (Tmino(DB)): This field in the margin assessment identifies the calculated minimum required opening torque at design basis condition based on as-left static and dynamic test data. This value is calculated by the spreadsheet. Refer to the spreadsheet for equation details.
As-Left Minimum Required Closing Stem Torque (Tminc,(DB)): This field in the margin assessment identifies the calculated minimum required closing torque at design basis conditions based on as-left static and dynamic test data. This value is calculated by the spreadsheet. Refer to the spreadsheet for equaSon details.
Page 11 of 17 m.
' BUTTERFLY VALVE MARGIN ASSESSMENT SPREADSHEET DEFINITIONS (cont'd)
Adjusted As-Left Available Opening Stem Torque (T'avo(DB)): This field in the margin assessment identifies the adjusted as-left available opening stem torque. For butterfly valves the value of T'avo(DB) is equal to the value of Tmaxo.
Adjusted As-Left Available Closing Stem Torque (T'avc(DB)): This field in the margin assessment identifies the adjusted as-left available closing stem torque. For LS valves this value is equal to the value of Tmaxc. For TS valves this value is equal to the torque at CST (Tcst,al) from the static baseline test with adjustments for inaccuracies. The app:ied inaccuracies include the sqc,'re root sum of squares for torque switch repeatability, spring pack relaxation, and strain gage inaccuracies. The T'avc(DB) value is calculated within the spreadsheet. Refer to sheet 3 of the table for equation details.
As-Left Opening Torque Margin (Tmargo): This field in the margin assessment identifies the available as-left opening torque margin based on the calculated minimum required opening torque (Tmino(DB)) and the as-left adjusted available opening torque (T'avo(DB))
This value is calculated by the spreadsheet. Refer to the spreadshes' for equation details.
As-Left Closing Torque Margin (Tmarge): This field in the margin assessment identifies the available as-left clesing torque margin based on the calculated minimum required closing torque (Tminc(DB)) and the as-left adjusted available closing torque (T'avc(DB)). This value is calculated by the spreadsheet. Refer to the r eadsheet for equation details.
Page 12 of 17
R/R GLOBE VALVE MARGIN ASSESSMENT SPREADSHEET DEFINITIONS Valve ID: This f; eld in the margin assessment identifies tag numbers of each globe valve included in the GL 89-10 and 96-05 population.
Valve Size: This field in the margin assessment identifies the valve body size.
Disc Type: This field in the margin assessment identifies the disc type of the valve. Disc types include unbalanced (UNB), balanced (BAL), flow under seat (FUS), and flow over seat (FOS).
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Mfg: This field in the margin assessment identifies the manufacturer of the subject valve.
Effective DP Disc Area (Aeff): This field in the margin assessment identifies the effective disc area subject to DP forces. This value is the bounding area as determined by in-situ dynamic testing. Multiplying the maximum differential pressure and the effective area will conservatively predict the maximum forces required to overcome differential pressure loads.
Use of Aeff eliminates the need to include a typical valve factor type multiplier.
Baseline Coefficient of Friction (COFbi): This field in the margin assessment identifies the baseline coefficient of friction utilized in the setpoint calculation. When adequately lubricated, a valve stem /stemnut COF is expected to approximate this value. For rising / rotating stem valves the setpoint calc assumed a COFbl equal to 0.20 for all valves. Because of the limitations of the diagnostic test system, no as-left COF or stem factor has been determined for these valves. The specified value of 0.20 for COF is considered conservative based on comparison to other valves in the GL 89-10 population.
Baseline Stem Factor (SFbl): This field in the margin assessment identifies the baseline stem factor utilized in the setpoint calculation at the baseline COF.
Stem Factor Degradation Allowance (SFD): For the purpose of margin assessment, all valves have a stem factor degradation allowance of 5% specified. This margin is include to accommodate potential changes in stem factor between maintenance intervals. Periodic testing performed to date has shown this value to be conservative given the current 1 cycle PM interval for stem lubrication.
Rate of Loading Factor (ROL): This field in the margin assessment identifies the rate of loading factor assumed in the margin assessments. This factor was calculated in the GPA's and has been included as a multiplier to the required opening and closing thrust requirements of the margin assessments.
As-Left Average Stem Packing Torque (Tapi,al): This field in the margin assessment identifies the average valve packing load as determined by static in-situ testing. If valve specific test data in unavailable, the bounding packing torque value assumed in the MOV setpoint calculation is specified.
Page 13 of 17 k
i R/R GLOBE VALVE MARGIN ASSESSMENT SPREADSHEET DEFINITIONS (cont'd)
Sealing Force (Fsf): This field in the margin assessment identifies the seat sealing force specified by the MOV setpoint calculation. This force is added to the minimum required closing thrust in order to assure that adequate sealing force is provided for valves with l
Category A seat leakage requirements.
Valve Stem and Disc Weight (Wsd): This field in the margin assessment identifies the valve stem and disc weight as specified in the MOV setpoint calculation.
Valve Lower Stem Area (Asml): This field in the margin assessment identifies the valve lower stem area as specified in the MOV setpoint calculation and is used to calculate stem rejection forces.
Maximum Expected Closing Line Pressure (MELPoc): This field in the margin assessment identifies the maximum expected closing line pressure as calculated by the GL 89-10 Operating Basis Calculations (OBC).
Maximum Expected Opening Line Pressure (MELPco): This field in the margin assessment identifies the maximum expected opening line pressure as calculated by the GL 89-10 Operating Basis Calculations (OBC).
Maximum Expected Closing Differential Pressure (MEDPoc): This field in the margin assessment identifies the maximum expected closing differential pressure as calculated by the GL 8910 Operating Basis Calculations (OBC).
Maximum Expected Opening Differential Pressure (MEDPco): This field in the margin assessment identifies the maximum expected opening differential pressure as calculated by the GL 89-10 Operating Basis Calculations (OBC).
Required Opening Differential Pressure Force (Fdpo): This field in the margin assessment identifies the required opening stem thrust due to design basis differential pressure only.
This value is obtained from the MOV setpoint calculation and, if applicable, is equal to the effective disk area (Aeff) times the opening differential pressure (MEOPco). NOTE: Fdpo is not applicable to all globe valve configurations. For example, if a globe valve tends to open with pressure (i.e. FUS), the value for Fdpo will be zero.
Required Closing Differential Pressure Force (Fdpc): This field in the margin assessment identifies the required closing stem thrust due to design basis differential pressure only. This value is obtained from the MOV setpoint calculation and, if applicable, is equal to the effective disk area (Aeff) times the closing differential pressure (MEDPoc). NOTE: Fdpc is not applicable to R/R globe valve configurations because all of the valves are FOS and flow tends to close the valves.
Seat Control Logic: This field in the margin assessment identifies the closing seat control logic. A MOV will be either torque seated (TS), bypass seate d (BS), or limit seated (LS).
Page 14 of 17
R/R GLOBE VALVE MARGIN ASSESSMENT SPREADSHEET DEFINITIONS (cont'd) i Seismic Force (Fse): This field in the margin assessment identifies the seismic force value used in the MOV setpoint calc. Seismic force is calculated by multiplying the stem and disc weight by the maximum seismic acceleration anticipated for a given valve under a seismic event. This load is conservatively included in determination of the minimum required opening and closing thrust.
Horizontal Forces (Fhz): This field in the margin assessment identifies the horizontal load for the MOV. This value is calculated in the MOV setpoint calculation and is applied '.o R/R globe valves due to the valve stem not being vertical. This value is obtained from the MOV setpoint calculation.
Other Closing Forces (Fother,oc): This field in the margin assessment identifies the other miscellaneous forces included in the determination of the minimum required closing thrusts.
For R/R globe valves a Fother force is included to account for disc alignment loads measured during design basis testing. This force was identified during the preparation of the applicable GPA and is included in the MOV setroint calculation.
Available Operator Opening Torque (Tavo): This field in the margin assessment identifies the design basis available opening output torque of the actuator at degraded voltge. This value is identified in the MOV setpoint calculation.
Available Operator Closing Torque (Tavc): This field in the margin assessment identifies the design basis available closing output torque of the actuator at degraded voltage. This value is identified in the MOV setpoint calculation.
As-Left Static Torque at CST (Test,al): This field in the margin assessment identifies the actuator output torque at control switch trip from the as-left static baseline test.
As-Left Closing Torque Switch Setting (TSS,al): This field in the margin assessment identifies the actuator close torque switch setting from the as-left static baseline test.
Torque Switch Repeatability (TSR): This field in the margin assessment identifies the actuator torque switch repeatability based on the actuator output torque and the close torque switch setting from the as-left static baseline test. The values of TSR are specified by Limitorque and range from 0.05 to 0.20. TSR is only applicable to torque seated valves.
Spring Pack Relaxation (SPR): This field in the margin assessment identifies the maximum expected spring pack relaxation which could affect actuator output. The maximum value of SPR is 3.2% or 0.032 based on review of Limitorque bulletins. SPR is only applicable to torque seated valves.
TMD Read Error (Etmd): This field in the margin assessment identifies the error associated with the measurement of the springpack displacement. A displacement monitoring transducer supplied by MOVATS is installed to measure springpack displacement. The error value is specified by MOVATS.
Page 15 of 17
R/R GLOBE VALVE MARGIN ASSESSMENT SPREADSHEET DEFINITIONS (cont'd)
Data Acquisition Module Error (Edam): This field in the margin assessment identifies the error associated with the MOVATS data acquisition module. The error value is specified by MOVATS.
Torque Curve Error (Et): This field in the margin assessment identifies the calibrated springpack curve torque error specified by the springpack calibration equipment manufacturer (B&W). The error associated with determining actuator output torque from springpack displacement is a function of Et and the torque at control switch trip.
Adjusted As-Left Static Torque at CST (T'est,al): This field in the margin assessment i
identifies the as-left actuator output torque at CST for the baseline static test with adjustments for inaccuracies. The applied inaccuracies include the square root sum of squares for torque switch repeatability, torque curve error, MOVATS DMT and DAM read
)
inaccuracies. The T'est,al value is calculated within the spreadsheet.
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Minimum Required Design Basis Opening Thrust (Fmino, req): This field in the margin assessment identifies the calculated minimum required opening thrust at design basis condition based on as-left static and dynamic test data. This value is calculated by the spreadsheet. Refer to the spreadsheet for equation details.
Minimum Required Design Basis Closing Thrust (Fminc, req): This field in the margin assessment identifies the calculated minimum required closing thrust at design basis conditions based on as-left static and dynamic test data. This value is calculated by the spreadsheet. Refer to the spreadsheet for equation details.
Minimum Required Design Basis Opening Torque (Tmino, req): This field in the margin assessment identifies the calculated minimum required opening torque at design basis condition based on as-left static and dynamic test data. This value is calculated by the spreadsheet. Refer to the spreadsheet for equation details.
Minimum Required Design Basis Closing Torque (Tminc, req): This field in the margin assessment identifies the calculated minimum required closing torque at design basis conditions based on as-left static and dynamic test data. This value is calculated by the s
spreadsheet. Refer to the spreadsheet for equation details.
Adjusted Available Design Basis Opening Torque (T'avo): This field in the margin j
assessment identifies the adjusted as-left available opening actuator output torque. For R/R
)
globe valves the value of T'avo is equal to the lesser of Tortq or Tavo. This value is calculated by the spreadsheet. Refer to the spreadsheet for equation details.
Adjusted Available Design Basis Closing Torque (T'avc): This field in the margin assessment identifies the adjusted as-left available closing actuator output torque. For TS valves this value is equal to the adjusted torque at CST (T' cst,al) from the static baseline test and calculated in the test data reconciliation section of the spreadsheet.
l Page 16 of 17
i R/R GLOBE VALVE MARGIN ASSESSMENT SPREADSHEET DEFINITION _S (cont'd)
As Left Opening Design Basis Torque Margin (Tmargo(DB)): This field in the margin assessment identifies the available as-left opening torque margin based on the calculated minimum required opening torque (Tmino, req) and the as-left adjusted available opening torque (T'avo). This value is calculated by the spreadsheet. Refer to the spreadsheet for equation details.
As-Left Closing Design Basis Torque Margin (Tmargc(DB)): This field in the margin assessment identifies the available as;teft closing torque margin based on the calculated minimum required closing torque (Tminc, req) and the as-left adjusted available closing torque (T'avc). This value is calculated by the spreadsheet. Refer to the spreadsheet for equation details.
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i Page 17 of 17 l
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