ML20151W130
| ML20151W130 | |
| Person / Time | |
|---|---|
| Site: | Farley  |
| Issue date: | 08/15/1988 |
| From: | Hairston W ALABAMA POWER CO. |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| IEB-85-003, IEB-85-3, NUDOCS 8808230323 | |
| Download: ML20151W130 (26) | |
Text
.
AlabQma Power Company
' 600 North 18th Street Post Office Box 2641 Birmingham, AJabama 35291-0400 Wephone 2052501837 W. G. Hairston,111 Senier Vice President AlabamaPower August 15, 1988 the southem electne sniem Docket Nos. 50-348 50-364 U.S. Nuclear Regulatory Commission ATTN:
Document Control Desk Vashington, D.C.
20555 Gentlemen:
Joseph M. Parley Nuclear Plant - Units 1 and 2 I.E. Bulletin No. 85-03 Motor-Operated Valve Common Mode Failures During Plant Transients Due to Improper'Svitch Settings I."
Bulletin No. 85-03 requested all nuclear power reactor facilities rivelop and implement a program to ensure switch settings on certain safety-related motor-operated valves (MOVs) are selected, set, and maintained correctly for the life of the plant.
By letter dated September 18, 1986, Alabama Power Company provided the results of item "a", a summary of the requested MOV design basis review including the maximum expected differential pressure for both valve opening and closing, and a preliminary Farley Nuclear Plant MOV Evaluation Program description and schedule to accomplish items "b" through "d".
As requested by your letter dated August 18, 1987, the additional information pertaining to.the program schedule extension and differential pressure testing.vas provided by Alabama Power Company letter dated September 16, 1987. The bulletin program for Farley Nuclear Plant Units 1 and 2 has been completed as described herein. This letter is provided to submit the final bulletin summary report as stated in Alabama Pover Company letter dated July 22, 1988.
In response to this bulletin and other industry-identified motor-operated valve issues, Alabama Power Company developed a comprehensive program for the bulletin-scoped valves to ensure that the valves are maintained in a high state of operational readiness. This program was based upon industry-accepted motor-operated valve testing methodologies and maintenance practices. The program vaa implemented during the Unit 1 eighth and the Unit 2 fifth refueling outages as scheduled.
The scope of the program for each unit included twenty-two (22) emergency core cooling system high head injection valves and fif teen-(15) auxiliary feedvater valves. All bulletin motor-operators vere subjected to "as found" testing, i
8808230323 G80815 gDR ADOCK0500g8
U. S. Nuclear Regulatory Commission Page 2 refurbishment or replaccment, and "as left" testing and calibration.
Either full or partial differential pressure testing was performed on twenty-eight (28) Unit 1 and twenty-seven (27) Unit 2 valves. The remaining valves were not subjected to a differential pressure test based on the "identical valve" criteria. To ensure bulletin-scoped valve switch settings are properly maintained, applicable switch settings and guidelines were incorporated into new controlled setpoint documents, and dedicated electrical maintenance procedures were provided for setpoint implementation.
Attachment I provides the final bulletin summary report and is intended to supplement the previous Alabama Power Company submittals. The motor-operated valve test data summary requested by bulletin item ~f" is provided by Tables I and II of Attachment I.
The summary of "as found" conditions prior to switch adjustments is contained in Attachment II.
Three bulletin valves did not satisfy the established switch setting acceptance criteria following completion of "as left" testing. As such, these settings have been justified as described in Attachment III, and the deviations vill be resolved by the end of the next scheduled Unit I refueling outage.
If there are any questions, please advise.
Respectfully submitted, ALABAMA POVER COMPANY al. A.Ik A x V. G. Hairston, III VGH,III/MGE: dst-8.8 Attachments cc: Mr. L. B. Long SVORN TO AND SUBSCRIBED BEFORE ME Dr. J. N. Grace THIS /[ DAY OF/)(
, 1988 Mr. E. A. Reeves Mr. V. H. Bradford hk k
Notar$ub:.lc Hy Commission Expires: k-II-8[
l l
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4 ATTACHMENT I FARLEY NUCLEAR PLANT MOTOR-0PERATED VALVE EVALUATION PROGRAM REPORT FOR I.E. BULLETIN 85-03 I.E.Bulletin 85-03 Action :l,tes "a" Bulletin item "a" requested the licensee to review and document the operational design basis for certain motor-operated valves in the high pressure safety injection and emergency feedvater systems.
Documentation of the maximum expected differential pressure during both valve. opening and
)
clcsing for normal and abnormal events was slecifically rs quested.
Alabama Power Company and the Farley Nuclear Plant designers performed '.he regtested motor-operated valve design basis wiev, as documented in letter i
dated September 18, 1986.
Subsequently, the maxirum expected differential pressure values for motor-operated valve; 3764A, B, C, D, E and F vere increased from 1270 psi to 1525 psi and for motor-operated valves 3209A and B, 3210A and B, and 3216 from 100 psi to 145 psi. These changes vere determined to be acceptable by the valve suppliers and Limitorque and are reflected in Tables I and II.
Selection of the "maximum expected differential pressure" for each bulletin valve was based on the greater of the valve design or the normal or abnormal operating differential pressures. This differential pressure provided the program basis for detevaining motor-operated valve thrust requirements. Because the maximum expected diffirential pressure was not always representative of those pressures encountired during abnormal plant conditions, the program established thrust requirement could hs greater than required for a given motor-operated valve to perform its required safety function.
I.R.Bulletin 85-03 Action Ites "b" Bulletin item "b" requested the establishment of a program to review and revise the methods for selecting and setting all motor-operated valve control switches including the torque, torque' bypass, and open limit switches, and thermal overloads.
In addition, this item requested the open and close torque svitda settings be established based on the maximum expected differential pressures.
Alabama Power Company addressed this bulletin item by separating the requirements into two elements--the determination and selection of switch settings and the svitch setting implementation methodologies.
Attachant I-Farley Nuclear Plant Motor-0parated Valve Evaluation. Program Report for I.E.Bulletin 85-03 Page-2 Torque switch thrust settings were typically calculated by using the standard Limitorque or-the valve vendor' thrust equation.
Factors such'as the maximum. differential pressure, stem piston effect, packing load, and valve factor vere included.in the calculated minimum setting.
Selection of a maximum setting required the consideration of other factors such as' maximum valve and motor-operator ratings, reduced; bus' voltage requirements, motor-operator. stall capabilities, and spring pack ~ range.. Calculated minimum and maximum-torque switch settings for each bulletin motor-operated valve were listed in the appropriate setpoint document..
The specified torque switch settings were adjusted to account for; test equipment accuracy and torque switch repeatability.
Alabama Pover Company decided the implementation of bulletin valve torque switch settings should employ the latest motor-operator. calibration j
technology and techniques available to'the-industry.' Therefore,.the Motor-Operated Valve Analysis and Test System'(MOVATS) was procured'for use at Farley Nuclear Plant, and a new maintenance procedure was developed to provide guidelines for motor-operator testing and torque switch calibration.
Limit switch-settings were also listed in the setpoint document for each motor-operated valve. The settings were normally specified in inches of stem travel for each limit switch rotor.
When required, additional guidelines were provided to supplement each setting.
In determining these settings the designers and valve suppliers considereo valve type, inertia 1
effects, and limit switch rotor functions such as torque switch bypass, l
open control, close control, and interlocks.
To provide optimum diversification, bulletin valve motor-operators were upgraded to four-train limit switch assemblies, and the open torque switch bypass 1.init switch was relocated to an independent rotor, providing separation from the close position indication circuits.
To assure the correct bulletin valve limit switch settings were implemented as required, a nov electrical maintenance procedure was developed based on an existing plant procedure and industry experience..The motor-operated valve calibration procedure also intornorated provisions to allow for limit switch adjustments using the setpoint document.
a Thermal overload heater selection criteria for the motor-operators vas.
refined based on Alabama Pover Company power plant experience, technical reports, and related industry events.
Factors considered when sizing overloads included motor size, motor thermal rating, and valve stroke time.
Thermal overload ranges and recommended sizes were specified in the setpoint document.
Implementation of refined thermal overload settings resulted in the l
development of a new motor starter electrical maintenance procedure. This procedure was based on the original motor starter pret.edure and incorporated additional testing requirements which confirmed the sizing assumptions and the "as left" thermal overload heater size.
Att:ch nt I j
Fcrley Nuclear Plant Motor-Operated Valva Evaluation Program Report for I.E.Bulletin 85-03 Page 3 I.E.Bulletin 85-03 Action Ites "c" Bulletin item "c" requested implementation of the established motor-operated valve switch settings, as appropriate, and the demonstration of valve operability by testing at the maximum ekpected differential pressure. Justitications must be provided for test'ing alternatives or not testing. This item also requested all bulletin valves be stroke tested, to the extent practical, to verify the cocrect implementation of the established switch settings.
Torque switch calibration and limit svitch adjustments were performed using MOVATS equipment, plant procedures, and the setpoint documents.
Upon completion of the motor-operator calibration process, thrust a:A switch signatures were analyzed, and the settings were independently verified.
l Torque switch "as left" thrust settings were determined to be acceptable when the "available thrust" above static running load was greater than the dynamic "differential pressure thrust" requirement.
When necessary, torqre j
switches were readjusted based on differential pressure test data and/or vendor recommendations. The open torque switch bypass limit svitch setting was acceptable for most valves as long as the hammerblov and valve cracking effects were bypassed. Other valves, such as the srip throttle valve (MOV3406), required an extended open torque switch bypass. The open limit control switch setting was verified to be acceptable if no backseating occurred during static testing. When the open limit control switch was also used to interlock other safety-related valves, additional acceptance criteria was required. On limit-seated valves the close limit control switch setting was acceptable if the valve fully seate(.
Thermal overload testing and selected heater refinements were performed using test equipment, plant procedures, and the setpoint document. Upon completion of the thermal overload testing process, the "as left" overload test data and selected motor-operator test data vere independently reviewed. The thermal overload heater size was verified to be acceptable for the required application if the following criteria vere satisfied. The overload provided sufficient time for valve unseating at motor Iceked rotor currer.; and for one full valve stroke at 200% full load current without an inadvertent trip.
In addition, tne overload provided motor protection from thermal damage at sustained locked rotor current.
Twenty-eight (28) Unit 1 and twenty-seven (27) Unit 2 valves were subjected to a differential pressure test. Nine (9) Unit 1 and ten (10) Unit 2 valves were not tested based on the "identical valve" criteria (i.e., four or more identical valves for which differential pressure data existed).
Whenever possible, pressure testing was performed at or near the maximum expected differential pressure for both valve opening and closing. To justify reduced pressure testing, selected valves were tested at two or more different pressures to substantiate the industry-determined assumption that loading factors due to increasing differential pressure are a linear function. The following process demonstrated that pressure tested motor-operated valve torque switch settings vere adequate:
Atttchment I Farlsy Nucletr Plcnt Mater-Opsrat&d Valva Evaluation Program Report for I.E. Bulletin C5-03 Page 4 1
- Extrapolate the measured thrust at test pressure to project the required "differential pressure thrust" at the maximum expected differential pressure;
- Determine the "available thru*t" by calculating the difference i
between the static running load thrust and the thrust at torque switch trip; and
- Verify that the "available thrust" is greater than the extrapolated "differential pressure thrust".
To justify that non-pressure tested motor-operated valve torque switch nettings were adequate required the analysis of identical valve pressure data from either the Parley Nuclear Plant or the HGVATS, Inc. database.
The following outlines _the basic steps required to establish a criteria and to determine acceptance for a nea-pressure tested valve:
Verify the non-prensure tested valve is identical to the valves in
' l the test group;
\\
- Obtain the measured differential pressure thrust and respective test pressure for each valve in the test group; i
- Perform a least squares regression analysis using the test data to i
determine the linear thrust requirements;
- Determine the "estimated differential pre:sure thrust" for the maximum expected differential pressure using the derived linear thrust requirements; 1
- calculate the "?O% confidence band thrust" for the "estimated i
differential pressure thrust" based on the test data and number of tests; 4
- Determine the non-pressure teste.1 valve "available thrust"; and Verify that the "available thrust" is greater than the "90%
confidence band thrust".
Tables I and II provide a summary of the "as left" open and close torque switch settings including the "available thrust" and "required differential-pressure thrust". The "required differential pressure thrust" is either the extrapolated "differential pressure thrust" or the "90% confidence band
'i thrust." If the "as left" settings for any bulletin valve did not satisfy the established acceptance criteria, appropriate justifications vere i
developed as summarized in Attachment III.
a 6 a - - - -,
. ~
~
' Attachitnt I Farley;Nuclect Plant Mstor-0parated Valva Evaluation Program Report for I.E.Bulletin 85-03 Page 5 i
After completion of'the cotor-operator maintenance and "as-left" calibration / testing, a complete. functional. logic. test was performed to
- demonstrate all' remote-manual-and tutomatic control signals, position-indication, and associated alarm functions.
"As left" calibration and' differential pressure test data was provided to the applicable-Farley.
designers and vendors for final review and acceptance. Noted discrepancies were either corrected or found to be acceptable as is.
Before plant a
startup, the applicable valve technical specification surveillance and inservice testing was satisfactorily completed.
I.E.Bulletin 85-03 Actien Item "d"
Bulletin item "d" requested the licensee to prepare or revise procedures to ensure correct motor-operated valve switch settings are determined and maintained throughout the life of the plant.
[This item is intended to be completely corsistent with action item 3.2 "Post-Maintenance Testing (All other safety-nelated components)" of Generic Letter 83-28.} The item "d" procedure preparation requirements also specified that applicable industry i
recommendations should be considered and that provisions should be provided.
1 i
to ronitor valve performance to ensure the switch settings are correct.
The existing Farley Nuclear Plant administrative controls provided i
sufficient provisions for satisfying the item "d" requirements.
Prior to initial program implementation, detailed procedures were developed for the bulletin valves as described in item "b".
Periodic testing of the bulletin motor-operated valves vill continue to be conducted in accordance with the applicable technical specification surveillance and inservice test program requirements to ensure valve operability. These requirements vill normally include valve stroke time, local leak rate, and/or integrated safeguards testing.
Future preventive or corrective maintenance activities vill be controlled using existing administrative controls.
l Bulletin 85-03 Action Item "e"
,s
~
toutetin item "e" requested the licensee to submit.a written report which documents the design basis review of item "a" and describes the program to accomplish items "b" through "d".
By letter dated September 18, 1986, Alabama Power company provided written reports to document completion of the design basia reviev and a vritten i
description of the planned FNP MOV Evaluation. Program for"I.E.Bulletin 05-03 including the anticipated program schedule.
By letter dated September 16, 1987, additional information was provided as requested by NRC l
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4 Atttchment I Farley Nuc]sar Plcnt Motor-0psrctsd Velva Evaluation Program Report for I.E.Bulletin 85-03 Tage 6 letter dated August 18, 1987. The preliminary program description, as outlined in the referenced Alabama Power Company letters, has been further defined / refined based on auditional industry experience, ongoing engineering evalustions, and actual plant enjerience gained during program laplementation.
As such, Alabama Povtr Company is providing updtted information in this submittal which is intended to supplement thi original FNP H0V Evaluation Program description. Therefore no additional oction is required for this item.
I.E.Bulletin 85-03 Action Item "f" Bulletin itse "f' requested a Cinal writter report vhich provides a verification of program completion, a summat/ of "as found" valve operability, and a test date sommary in tabular form.
The FNP MOV Evalcation Program for 1.E.Bulletin 85-03 has been completed as described herein. A cammary of the "as found" conditions prior to switch adjustments is provAded by Attachment II.
The "as fount', "as left", and differential pressure 'est data is provided in Tables I and II for each bullatin valve in Farley Unit.= 1 and 2, respectively.
B l
i r
GLOSSARY FOR TABLES I & II Available Thrust Operator thruat at torque switch trip minus static running load.
Cracking Period of the opening valve stroke when the disk overcomes static friction and begins to move.
CV Copes-Vulcan.
DP Thrust Heasured dynamic thrust required to overcome differential and line pressure minus static running load.
FVG Flex-vedge gate valve.
GLB0 Glebe valve with flov over the disk.
GLBU Globe valve with flow under the disk.
Max. Expected DP The greater of either the design or the normal or abnormal operating differential pressures for the given valve, MOV TPNS The unique identifier for each motor-operated valve.
Open Byps Oper, torque switch bypass limit switch.
Required DP Thrust The extrapolated "differential pressure thrust" for pressure tested valves or the "90% confidence band thrust" for non-pressure tested valves, kKVL Rockvell.
S Satisfactory.
SC Stop-check valve.
SK Schutte & Koerting.
i SVG Solid-vedge gate valve.
Torq. Sv. Setting Torque svitch setting expressed in pounds of thrust.
Glcsstry Page 2 t
Test Metht.d Type A The MOV vas tested at 90% of maximum expected DP or greater; measured thrust to overcome DP was extrapolated te maximum expected DP.
Test Method Type B The MOV was tested at less than 90% of' maximum 4
expected DPi measured thrust to overcome DP was extrapolated up to maximum expected DP.
i Test Method Type C The required available-thrust, based on e 90%
confidence band, was determined through statiutical analysis of DP test data from identical valves at Farley Nuclear Plant.
Test Method Type D The required available thrust, based on a 90%
confidence band, was determined through statistical analysis of DP test data from the MOVATS, Inc. database.
U Unsatisfactory.
VEL Velan.
WP Villiam Povell.
\\..
NOTES FOR TABI.BS I & II.
' ~
,,i (a) New operator--original operator vas an SMB-0-15 vith a 3500 4
rpm motor and 39.11:1 unit ratio.
(b) New unit ratio--original unit ratio was 41:1.
(c) New motor--original motor rpm vac 1720.
(d) No DP effect observed, s
(e) Limit switch broken.
d (f) Torque switch anomaly.
(g) Data not available.
.. I 1
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ATTACHMENT II
SUMMARY
OF "AS FOUND" CONDITIONS FRIOR TO SWITCH ADJUSTMENTS The motor-operated valves listed belov vould have performed their required safety function (s) prior to any switch adjustments.
01E21LCV01150 01E21MOV8109B 01N23MOV3350B 02E21MOV8109C 01E21LCV0115E 01E21MOV8109C 01N23MOV3350C 02B21MOV8108 01E21LCV0115B 01E21MOV8107 02E21LCV0115C 02E21A0V8801A 01E211CV0115D 01E21MOV8108 02E21LCV0115D 02E21MOV88015 01E21MOV8130A 01E21MOV8801B 02E21MOV8130A 02E21MOV88035 01E21MOV8130B Q1E21MOV8803B 02E21MOV8130B 02N23MOV3209A 01E21MOV8131A 01N23MOV3209B 02E21MOV8131A 02N23MOV32098 01E21MOV8131B 01N23MOV3210A 02E21MOV8131B 02N23MOV3216 01E21MOV8132A 01N23MOV3764A 02E21MOV8132B 02N23MOV32108 01E21MOV8132B 01N23MOV37648 02321MOV8133B 02N23MOV3764D 01E21MOV8133A 01N23MOV3764F 02E21MOV8109A 02N23MOV3350C 01E21MOV8133B 01N23MOV3350A 02221MOV81098 02N12MOV3406 01E21MOV8109A The motor-operated valves listed below performed as describcd prior to any svitch adjustments.
01E21MOV8106 The 40V satisfied its previous surveillance test 1
- The valve vould have opened against approximately 2450 psid with its "as found" available thrusti 1
The valve vould have closed against approximately 1805 psid with its "as found" available thrust; The "as found" thermal overload heater settings prevented an inadvertent nyerload trip; and i
- The "as found" open torque svitch bypass limit svitch covered cracking loads.
j 01E21MOV8801A i
The HOV satisfied its previous surveillance test;
- The H0V satisfactorily functioned when subjected to dynamic conditions during integrated safeguards testingt
- The valve vould have opened against approximately 2230 psid with its "as found" available thrustl
- The valve vould have closed against approximately 1705 psid with its "as found" available thrust and The "as found" thermal overload heater settings prevented an inadvertent overload trip.
Attachment II Page 2 01E21NOV8803A The MOV satisfied its previous surveillance test; The MOV satisfactorily functioned when subjected to dynamic conditions during integrated safeguards testing The valve vould have opened against approximately 1730 psid with its "as found" available thrust The "as found"'close available thrust was greater than the required DP thrust; and The "as found" thermal overload heater settings prevented an-inadvertent overload trip.
01N23NOV3209A
- The MOV satisfied its previous surveillance testi The valve vould have closed against approximately 95 psid with its "as found" svailable thrust; and The "as found" thermal overload heater settings prevented an inadvertent overload trip.
01N23NOV3216
- The MOV satisfied its previous surveillance testi The valve vould have opened against approximately 50 psid with its "as found" available thrust
- The valve vould have closed against approximately 110 psid with its "as found" available thrust; and
- The "as found" thermal overload heater settings preventea an inadvertent overload trip.
01N23NOV3210B i
- The MOV satisfied its previous surveillance test;
)
- The valve vould have opened against approximately 90 psid with its "as found" available thrust a.
- The "as found" close available thrust was greater than the required DP i
thrust; The "as found" thermal overload heater settings prevented an inadvertent overload trip; and The "as found" open torque svitch bypass limit switch covered cracking loads.
1 1
l Attachment II-Page 3 01N23NOV3764C OlN23NOV3764E
- These HOVs satisfied their previous surveillance tests; The "as found" open available thrust vas greater than the required DP thrust M0V3764C vould have closed against approximately 730 psid, and MOV3764E vould have closed against approximately 750 psid; and
- The "as found" thermal overload heater settings prevented an inadvertent overload trip.
OlN23MOV3764D T
The MOV satisfied its previous surveillance testi and The "as found" thermal overload heater settings prevented an inadvertent overload trip.
OlN12NOV3406
- The MOV satisfied its previous surveillance test; The valve vould have opened against approximately 1071 psid with its "as found" available thrust
- The "as found" close available thrust was greater than the required DP thrust; and The "as found" thermal overload heater settings prevented an inadvertent overload trip.
02B21LCV0ll5B The MOV satisfied its previous surveillance tests 4
The HOV satisfactorily functioned when subjected to dynamic conditions during integrated safeguards testing;
- The "as found" open available thrust was greater than the required DP thrust; and The "as found" thermal overload heater settings prevented an inadvertent overload trip.
m
Attachment II Page 4.
P 02B21LCV0115B The MOV satisfied its previous surveillance testi The MOV satisfactorily functioned when subjected to dynamic conditions during integrated safeguards testing 1 The valve vould have opened against approximately 38 psid with its "as-found" available thrust;
- The valve vould have closed against approximately.189 psid with its "as found" available thrusti The "as found" thermal overload heater settings prevented an inadvertent overload trip; and
- The "as found" open torque switch bypass' limit switch setting covered cracking loads.
02E21NOVP132A 02E21NOV6143A These MOVs satisfied their previous surveillance tests; The MOVs are normally aligned for high head injection with electrical i
power removed MOV8132A vould have opened against approximately 1799 psid, and MOV8133A vould have opened against approximately 1397 psid MOV8132A vould have closed against approximately 2181 psid, and MOV6133A vould have closed against approximately 1735 psid; and i
- The "as found" thermal overload heater settings prevented an inadvertent overload trip.
02E21NOV8106 The MOV satisfied its previous surveillance testi
)
The "as found" open availa'ule thrust was greater than the required DP thrust The valve vould have closed against approximately 1335 psid with its "as found" available thrusts and The "as found" thermal overload heater settings prevented an inadvertent overload trip.
)
l
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Attachment II Page 5 02E21NOV8107 d
- The MOV satisfied its previous surveillance testi The MOV satisfactorily functioned when subjected to dynamic conditions during integrated safeguards testing
- The "as found" open available thrust was greater than the required DP.
thrustl The valve vould have closed against approximately 2240 psid with its "as found" available thrusti and The "as found" thermal overload heater settings prevented an l
inadvertent overload trip.
02E21NOV8803A
]
The MOV satisfied its previous surveillance test; The MOV satisfactori.ly functioned when subjected to dynamic conditions during integrated safeguards testing)
I The valve vould have opened against approximately 2530 psid with its "as found" availcble thrusti The valve vould have closed against approximately 1575 psid with its "as found" available thrust; and The "as found" thermal overload heater settings prevented an inadvertent overload trip.
t j
02N23MOV3210A The NOV satisfied its previous surveillar.ce testi
- The valve vould have opened against approxi-ately 20 psid with its "as found" available thrusti The "as found" close available thrust was greater than the required DP thrust; The "as feund" thermal overload heater settings prevented an inadvertent overload tript and The open torque,
h bypass limit svitch covered cracking loads.
4 b
e
Attachment.II Page 6 l
02N23NOV3764A i
The MOV satisfied its previous surveillance test; and The "as found" open available thrust was greater.than the required DP i
thrust.
02N23NOV3764B 02N23NOV3764E
- These MOVs satisfied their p.....us surveillance tests;
- M0V3764b vould have opened against approximately 1330 psid, and M0V3764E vould have opened against approximately 445 psid; and
- MOV3764B vould have closed against approxir.ately 810 psid, and MOV3764E vould have closed against approximately 70 psid.
02N23NOV3764C
- The MOV satisfied its previous surveillance test; and The "as found" thermal overload heater settings prevented an inadvertent overload trip.
02N23NOV3764F
- The MOV satisfied its previous surveillance test;
- The valve vould have opened agains? approximately 1495 psid with its "as found" available thrust; i
- The valve vould have-closed against appro:timately 570 psid with its l
"as found" available thrust; and l
)
The "as found" thermal overload heater sett?ngs prevented an l
inadvertent overload trip.
02Ni3NOV3350A I
The MOV ratisfied its previous surveillan,e test; l
The MOV is maintained in the open position with its electrical breaker l
lotked open; i
The "ar, found" open available thrust was greater than the required DP i
l thrust; I
l l
Attachment II Page 7 4
The valve vould have closed against approximately 285 psid with its "as found" available thrust; and The "as found" thermal overload heater settings prevented an inadvertent overload trip.
02N23MOV33508 The MOV satisfied its previous surveillance test; The MOV is maintained in the open position with its electrical breaker locked open:
The "as found" close available thrust was greater than the required DP thrust; and The "as found" thermal overload heater settings prevented an inadvertent overload trip.
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ATTACRMENT III St!MMARY OF "AS LRFF" SETTINGS NOT SATISFYING THE ESTABLISHED ACCEPTANCE CRITERIA FOR BULLETIN MOVS P
Q1E21MOV8106 MOV8106 is the HHSI pump _ common miniflov isolation valve, and it is redundant to the individual pump miniflov valves HOV8109A, B and C.
Valve operation is administratively controlled during accident and post-accident conditions by the Emergency Responso Procedures (ERPs).
Because the "as left" close available thrust of 10,100 lbs is less than the required DP thrust of 12,420 lbs, the MOV8106 close setting does not meet the established acceptance criteria for non-pressure tested bulletin MOVs.
Hovever, the MOV8106 "as left" close setting is found to be acceptable as is based on the following:
The valve vill stroke closed against approximately 2236 psid with its "as left" available thrust, based on the 90% confidence band thru.ct requirement for identical valves;
- The valve vill stroke closed against approximately 3272 psid with its "as left" available thrust, based on the statistical regression equation mean thrust value for identical valves; The ERPs specify that M0V8106 closure is not required until RCS pressure is less than 1300 psig.
At this RC5 pressura, the maximum expected DP across MOV8106 vould be approximately 2380 psid with two HRSI pumps running or approximately 1946 psid with one HHSI pump running; The maximum expected DP ar.ross MOV8106 vould be approxiaately 2056 psid with two HHSI pumps running or approximately 1300 psid with one HHSI pump running when the RCS is depressurized; and The valve closure cap >ility vould be required only if one of the individual miniflov vaives (Y9V8109A, B or C) failed to close.
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02N23MOV37'4F MOV3764T is the redundant MDAFV pump discharge isolation valve to steam c tr.ator "C".
The valve is normally open, and valve operation is auainistratively controlled duri, accident and post-accident conditions by the ERPs.
Because the "as left" close available thrust of 16,500 lbs is less than the required DP thrust of 16,540 lbs, the MOV376*F close setting does not meet the established ecceptance criteria for pressure tested bulletin MOVs.
However, MOV3764F vould perform its closing safety function if required based on the follovingt
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Attachment III Pagu 2 The valve vill stroke closed against approximately 1521 psid curing a cold shutdovn condition with its "es left" available' thrust, based on the extrapolated thrurt requirement; The valve successfully closed when subjected to five different reduced pressure tests ranging,from 1225 to 1460 psid The tahimum pressure of.1270 psid is more appropriate'for emergency j
conditions, such as a feedline break, and valve closucw would be
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successful at this reduced pressure; and The valve closure capability would be required only if the redundant valve (MOV3764C) failed to cle*e.
02N23MOV3350A I
A0V3350A is a stop check valve located in the c(mmon AH discharge header j
to steam generator "A".
Prior to plant startup, the motor-operator is used to disable the stop feature, then the electrical feeder breaker is locked open.
As such, M0V3350A functions only as a check valve during normal and abnormal plant operations.
Because the "as left' close available thrust of 25,630 lbs is less than the required DP thriist of 27,000 lbs, the MOV3350A S i close ' setting does not meet the established acceptance criteria for j' pressure tested bulletin MOVs. However, MOV3350A vould perform its closing l
4 safety function if required based on the following l
l The valve vill stroke cirsed against apprnximately 1518 psid during a cold shutdown condition sith ito "as left" available thrust, based on I,
the extrapolated thrust requirement;
- The valve was successfully subjected to a full flov (440 gpm) differential prest are test at 1486 psid; v
k - T1.e maximum pressuce of 1270 psid.s more appropriate for emergency g
conditions, such as a feedline break, and valve closure vould be
$h successful at this reduced pressure; and ri 4*
k.TheERPsdonotutilizeMOV3350Aforisolationelthesteamgenerator gg"AFVheader.
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