U-600429, Responds to Sser 5,SER Outstanding Issue 7ii Re Seismic & Dynamic Qualification of Equipment.Responses to Section 3.11.5,Items 1-3 & Related Documentation Encl
| ML20137U592 | |
| Person / Time | |
|---|---|
| Site: | Clinton  |
| Issue date: | 02/14/1986 |
| From: | Spangenberg F ILLINOIS POWER CO. |
| To: | Butler W Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20137U598 | List: |
| References | |
| U-600429, NUDOCS 8602190260 | |
| Download: ML20137U592 (16) | |
Text
7 4-l U-600429 L30--86 (02-14 )-L
^1A.120
/LLINDIS POWER 00MPANY CLINTON POWER STATION. P.O. Box 678. CLINTON. ILLINOIS 61727 February 14, 1986 Docket No. 50-461 Director of Nuclear Reactor Regulation Attention:
Dr. W. R. Butler, Director BWR Project Directorate No. 4
~ Division of BWR Licensing U.S. Nuclear Regulatory Commission Washington, DC 20555
Subject:
Clinton Power Station Unit 1 SER Outstanding Issue #711 Seismic and Dynamic Qualification of Equipment
Dear Dr. Butler:
This letter is in response to several open items identified in Supplemental Safety Evaluation Report (SSER) Number 5.
Attached for your Staff's review are responses to Section 3.11.5, Items 1 through 3.
Please contact us if you have any questions on this matter.
Sincerely yours, F. A. S ang berg Manager - Licensirb; and Safety SMK/cke Attachments cc:
B. L. Siegel, NRC Clinton Licensing Project Manager NRC Resident Office Regional Administrutor, Region III, USNRC Illinois Department of Nuclear Safety 8602190260 860214 PDR ADOCM 05000461 E
PDR gO i
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Attachmsnt 1 to
-U-600429 The following. equates to SSER Supplement No. 5, items (1) through (3) of Section 3.11.5 for Clinton Power Station and constitutes Illinois Power Company's response:
(1)
"The applicant must notify the Staff that the deficiencies cited during the audit have been corrected and all equipment is qualified."
"With the exception of one file, adequate proof was provided to establish qualification as claimed. The one exception (file EQCL-009), contained a number of' deficiencies:
The aging of internal components was not adequately addressed.
The requirement for submergence was inaccurately listed.
The qualification of internal components was not fully established."
Response: All deficiencies cited during the audit have been corrected and all equipment is qualified.
File EQ-CL009 has been revised as follows:
Limitorque Report No. B0212 was incorporated to address aging of phenolics. With this addition the discourse on aging of internal components is complete. A copy of pertinent pages from Rev. 11 is attached for information.
The requirement for submergence of the operator was deleted.
It was also deleted from FSAR 3.11 tables. A copy of the pertinent page from Rev. 5 is attached for information.
File EQ-CLO25 (Rockbestos and Flametrol wires) has been incorporated by reference. This addition completes the discourse on the qualification of internal components. A copy of the pertinent page from Rev. 13 is attached for information.
(2)
"The acceptability of the safety related mechanical equipment qualification program must be established."
Response: The following is in response to the two open NRC questions pertaining to the mechanical environmental qualification program.
1.
File MEQ-CLOS 6 has been revised to address the adequacy of snubber lubricant. A copy of the pertinent pagcc from Rev. 6 is attached for information.
2.
File MEQ-CLO75 has been revist ' to address the adequacy of Buna-N material. A copy of pertinent pages from Rev. 5 is attached for information.
Attachmznt 1 'to U-600429 (3) "The applicant must notify the Staff that the inconsistencies identified in FSAR Tables 3.11-1, -2,
-3, and -4 have been corrected."
Response: The inconsistencies identified in FSAR Tables 3.11-1,
-2, -3, and -4 have been corrected and are reflected in Amendment
- 36.
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Approved by Date justification is predicated on the use of the UL tempera-ture index for molded phenolics of 150*C and an aging rate for the ma terials equivalent to the 10*C rule.
The temperature index establishes tha t the material will degrade to 50% of its initial impact strength, tensile strength or dielectric strength in 6x10* hours when subiected to a 150*C temperature for this duration.
The value of time and temperature establishes a point on a log life versus tenpera-ture. plot.
Assuming an aging characteristic following the.
10 C* rule, the life of the material in a 60*C ambient can be found by extrapolating from the established point.
This
,value of life turnr out to be 3.0xl'07 hours8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br />.
Forty years represents only 1.2% of the defined available life of the material.
Therefore, it can be, concluded that the _ switch and block material are improvious to aging since an insig-nificant amount of degradation is anticipated.
We cena r with the Limitorque analysis, as sum.arized above.
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Appendix 3 of the E?nI Final Report MP-lS58, j
titled, "A Review of Equipment Aging Theory and Tcchnology" indicates that phenolics have an activation energy range Irom 0.96 (ev) to 1.
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rate nuch slcuer than that assu ad by Limitorque.
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this, the analysis by Limitorque is considered to be con-servative and adequa tely f us tif, tha excl.::ica f r n :h2:=21 8
aging of contact blec'.:s and nititches.
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In addition to phenclics, the torque and limit switches contain 0-rings and possible gasketing materials., LiEitorque contends that their an lysis of gaskets and seals, as des-cribed for the actuator, is applicable to these switches.
Mechanical.;ci..c The valve actuator assc=bly was cycled 500 times (one cyc1.c consisted of an open and close stroke).
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using a. load cell to simulate sealing thrus t.
Performance g
was judged by monitoring the thrust outcut through the torqua twitch.
The thrust readings remained within reasonabic limits, s
3 20,740 lbs. initially, and 21,05 3 lbs. final.
The tes t dentsn-g atrated operability of the motor and wear aging of the motor cnd torque switches.
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f NUCLEAR POWER STATION QUALIFICATION TYPE TEST REPORT LIMITORQUE VALVE ACTUATORS WITH TYPE LR FDTOR FOR WESTINGHOUSE PWR REPORT B0212
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Tested per IEEE Standards 382-1980, 323-1974 and 344-1975 i
Test performed 18 June 1984 to 30 November 1984 A
3 Written by d.M Date 4-ic '9 7 n a, J. B. DraI Special Projects Engineer Approved by
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2.1 (Qn.):
Ne actuator tested c:ntained the following accessories:
- 1) 4-rotor geared limit switch (8/M #10120-1-3)
Brown nuclear insulating material Bronze intermittent gear case Mobil 28 lubrication
- 2) Nuclear torque switch (B/M d11500-010-02)
Brown nuclear insulating material
- 3) Viton seals
- 4) Pressure relief valve in main gear box
- 5) Reliance Electric Company Type LR motor
- 6) Marathon 300 terminal strip (7-point, every other terminal removed).
NOTE: The test motor was connected to the power supply through safety-related splices. To provide the future option-of use of a qualified safety-related splice or a terminal strip to connect the incoming power leads to the motor, the test terminal strip was mounted in the test actuator.
During the pressure-temperature transients, at each oper-ation of the test actuator,_a-motor located outside the test chainber was run in each direction for 30 seconds using power directed through the teseterminal strip.
3.0 ACCEPTANCE CRITERIA:
The basic function of a valve actuator during a 08E is to provide the required torque and be capable of accepting the thrust to actuate a valve to either the open or closed position, as required. Also, it is required that limit switches and torque switch function properly to provide proper control logic. All qualifications conducted by Limitorque in this test program have been directed toward the candidate SMB-00 actuator deliver-ing its rated torque of 250'# and capable of accepting rated thrust of 14,0001 while both the limit switch and torque switch are providing their proper control functions.
The electrical resistance to ground of all limit and torque switch c:n-nections and motor leads are taken for information and are not part of the acceptance.
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5 J.4 HEL3/'dSL3 Simulation:
?.t::ose tne aged actuator o a HEL3/MSL3 event simulation using cressure-temoerature tr!cstents illustratec in Fig. 1 in appendix G.
Meager limit switch and torque switen connections and motor leads to ground and operate actuator at times indicated in Fig. 1.
Spray 2
at a rate of 0.15 gpm/ft of actuator horizontal cross-section during time shown on the pressure-temperature profile (Fig. 1) using a chemical spray consisting of 2500 ppm Baron buffered with Sodium Hydroxide to 10.5pH.
4.5 Post Test Inspection:
At conclusion of the pressure-temperature transients, disassemble the actuator making observations on the condition of the components.
5.0 ACCURACY OF TEST DATA:
The accuracy of the data presented in this report is within the accuracies of the instruments included in Appendix A.
6.0 TYPE TEST RESULTS:
6.1 Baseline Test:
The results of the baseline test are included in Appendix B.
This report also includes the baseline test taken prior to the HELB/MSLB environmental test (included in Appendix F) which demonstrates there was no significant change in actuator perfom-ance after simulated aging for 40-year life.
6.2 Thermal Aging:
The lubricant in the main gear box and limit switch intermittent gear housing is subject to periodic maintenance during 'luclear Power Plant operation. Due to this fact, thermal accelerated aging of the lubricant was not considered necessary since during the actuator's life, the lubricant co;1d be reconditioned or replaced. Maintenance of the lubricant following the thermal aging step only is permitted.
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6.0 TYPE TEST RESULTS (Cont.):
6.2 Thermal Aaina (Cont.':
Jue to the high activation energies of the limit switch, tor:ue switen and terminal block, thermai aging of tnese components dith the actuator would age these materials far beyond acceptable margins.
Because of this, the limit switch, torque switch and teminal block were agea separately. The limit and torque switches were activated by an external drive through the oven wall to simulate the same mechanical cycles they would experience had they been in the test actuator during its thermal aging.
Accelerated thermal aging was initiated June 20, 1984, and concluded July 3, 1984.
The actuator, including motor and using limit and torque switches that are not part of the test actuator, was thermally aged at a nominal temperature of 284 degrees F for 300 hours0.00347 days <br />0.0833 hours <br />4.960317e-4 weeks <br />1.1415e-4 months <br /> simulating a 40-year life.
During themal aging, the actuator was cycled 210 times including 10 cycles for " setup." Each cycle consisted of stroking the actuator from a limit switch trip open position to a torque switch trip thrust seated closed position back to the limit switch open position.
The limit and torque switch was themally aged at a nominal tempera-ture of 238 degrees F for 100 hours0.00116 days <br />0.0278 hours <br />1.653439e-4 weeks <br />3.805e-5 months <br /> simulating over a 40-year. life (activation energy of 1.78 eV). During thermal aging both switches were cycled 210 times including 10 cycles for " setup."
The terminal strip was thermally aged at a nominal temperature of 261 degrees F for 100 nours simulating over a J0-year life (activation energy of 1.63 eV).
6.3 Mechanical Aging:
Mechanical aging consisted of stroking the actuator from an open limit switch controlled position to a torque switch controlled close position at room ambient temperature.
The stroke time was nominally 19 seconds.
The cycling was initiated on July 9, 1984, and concluded July 18, 1984.
The actuator was cycled for a total of 1816 cycles including five (5)
" setup" cycles and resulted in 2026 total mecnanical cycles during thermal and mechanical aging procedures.
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6.0 TYPE TEST EESULTS (Cont.):
6.10 Post Accident Actuator Inspection:
5.10.1 S'o to r:
The motor was removed from the actuator and dismantled for inspection.
The stator insulation was darkened to almost black in color. However, high insulation resistance measurements and balanced phase to phase resistance prove the-stator to be in good electrical condition. The hearings and lipseal were in good condition. The rotor and stator I.O. were in good condition, however, did show evidence of slight build-up of an unidentified substance in the motor air gap.
6.10.2 Switches:
The limit and torque switches were in good condition.
The switch contacts were slightly ~ discolored 'but clean.
l The lubricant in the limit switch intermittent gear box darkened in color, but maintained its lubricity. The contact -springs on the torque switch and finger springs on the limit switch were in good condition.
6/10.3 Main Gear Box:
The main gear box lubricant darkened in color, but maintained its lubricity. There was evidence of a small amount of condensate in the lubricant. Bearings and gears were in good condition with no wear noted.
7.0 CONCLUSION
S:
The Limitorque SMB-00-15 valve actuator was subjected to an HELB/MSL3 event qualification test consisting of exposure to a steam chemical environment, including two temperature and pressure transients from 120 degrees F to over 420 degrees F in approximately 27 seconds. Prior to exposing the actuator to the DBE environment, the entire actuator was:
a) Thermally aged to simulate a 40-year life b) tiechanically aged to over 2000 cycles y
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C.':CU.'SIONS (Cont. ):
c) Pressurization tested d)
Irradiated to life radiation level e) Plant vibration aging and seismic testing f)
Irradiated to DBE radiation level The actuator was cycled with simulated valve seating loads during the DBE environmental testing at elevated temperatures and pressures.
Since the actuator performed normally throughout the test, it is conciv.d this test qualifies similar Limitorque actuators for use in PWR contain-ment chamber service where the environmental conditions stipulated in this report or lesser conditions are encountered.
The SMB-00 actuator qualified in this report is an average, mid-size unit.
All size. actuators'are constructed of the same materials with components designed to equivalent stress levels, same clearances and tolerances with the only difference being in physical size which varies corresponding to the differences in units rating.
It is concluded all other sizes (from smallest to largest) of the type SMB, SB, SBD, and SMB/HBC are also equally qualified.
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A valve actuacor with identical treatment of thermal aging and radiation was cycled 1208 times and exposed to a LOCA accident.
Thus, substantially higher levels of margin are implicitly considered.
This is found in Appendix C, Section 3.1.2, of the Limitorque report).
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