ML20215H093
| ML20215H093 | |
| Person / Time | |
|---|---|
| Issue date: | 04/10/1987 |
| From: | Naidu K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| To: | Merschoff E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| References | |
| REF-QA-99900839 IEIN-86-093, IEIN-86-93, NUDOCS 8704200040 | |
| Download: ML20215H093 (18) | |
Text
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UNITED STATES l o NUCLEAR REGULATORY COMMISSION y $ WASHINGTON, D. C. 20555 k %***
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April 10, 1987 Docket No. 99900839 l
MEMORANDUM FOR: Ellis W. Merschoff, Acting Chief Vendor Program Branch DQAVT/01E g THRU: Edward T. Baker, Acting Chie /P Reactive Inspection Section Vendor Program Branch DQAVT/0lE FROM: K. R. Naidu Reactive Inspection Section Vendor Program Branch DQAVT/01E
SUBJECT:
TRIP TO CHARLOTTE, NORTH CAROLINA. MARCH 6, 1987 TO ATTEND A PRESENTATION BY DUKE POWER COMPANY (DUKE)
RELATIVE TO THE R0TORK VALVE MOTOR OPERATOR (RVMO)
TEST RESULTS
Background
NRC issued IN 86-93 informing licensees that Duke Power Company discovered problems with valves operated by RVM0s at McGuire Nuclear Station. Specifically, the problem involved RVM0s for which the factory-set torque settings had been changed at the plant site using a generic correlation between the octuator torque output and torque switch setting. Rotork stated that whenever the factory torque switch setting is changed in the field, an individual calibration curve or a bench test is required to accurately determine torque output. f' uke Power Company represent 1tives stated that during the construction phase cf a nuclear power plant, it is common practice to turn the torque selector
! switch (TSS) of a valve motor operator to minimum. After installation, prior to l startup, the TSS is returned to the manufacturer's recommended setting. Rotork I
stated that manipulating the TSS in the field may yield different torque values when returned to the f.actory preset position.
1 Minutes of the Meeting l R. J.,Kiessel, IE (author of IN 06-93), W. T. Orders, SRI McGuire, and I attended the presentation. Several members of Duke and Rotork participated in the presentation.
Luke stated that they performed tests on several RVM0s installed at McGuire 1 dnd 2, and determined that the torque value measured with the TSS set at position 5 (Max) was the same as the value indicated on the Rotork test certificate. However, the values measured with the TSS in positions 3 and 1 l
l bN !u NO 99900839 PDR Nh
EilisW.Merschoff April 10, 1987 I
varied due to the variables in the actuator and test bench. Variables in the actuator included attributes such as the spring pack pre-load, torque selector setting, actuator speed and motor temperature. Test bench variables included I
attributes such as number of brake pads used, loading rate, and equipment cali-bration.
Duke outlined the program direction consisting of the short term evaluations, a five year M0V upgrade program, preventative maintenance program, and continu-ing MOV research program. A handout, titled " Valve and Valve Operator Improvenent Program," outlining Duke's program is enclosed O
k-K. R. Naidu Reactive Inspection Section Vendor Program Branch DOAVT/01E b
Enclosure:
As stated y ,
Ellis W. Merschoff April 10, 1987 varied due to the variables in the actuator and test bench. Variables in the actuator included attributes such as the spring pack pre-load, torque selector setting, actuator speed and motor temperature. Test bench variables" included attributes such as number of brake pads used, loading rate, and equipment cali-bration.
Duke outlined the program direction consisting of the short term evaluations, a five year MOV upgrade program, preventative maintenance program, and continu-ing MOV research program. A handout, titled " Valve and Valve Operator Irrprovement Program," outlining Duke's program is enclosed ,
\sI K. R. Naidu Reactiwe Inspection Section Vendor Program Branch 00AVT/01E DISTRIBUTION:
RIDS Code IE:09 i t VPB Reading 00AVT Reading JTaylor '
BGrimes HMiller EBaker KNaidu RJKiessell, IE WT0rders, SRI, McGuire, RII GASchnebli, RII i
\
- See previous page for concurrences.
, VPB:00AVT ASC/VPB:00AVT ABC/VPB:DOAVT l KNaidu:tt* EBaker* EMerschoff*
4/8/87 4/8/87 4/9/87 l
Ellis U. Merschoff April 10,1987 varied due to the variables in the actuator and test bench. Variables in the actuator included attributes such as the sprinn pack pre-load, torque selector setting, actuator speed and motor temperature. Test bench variables included attributes such as number of brake pads used, loading rate, and equipment cali-bration.
Duke outlined the program direction consisting of the short term evaluations, a five year MOV upgrade program, preventative maintenance program, and continu-ing M0V research program. A handout, titled " Valve and Valve Operator Improvement .
Program " outlinino Duke's program is enclosed
\sI K. R. Naidu Reactive Inspection Section Vendor Progran Branch DOAVT/01E DISTRIBUTION:
RIDS Code IE:09 VPB Reading D0AVT Reading JTaylor BGrimes j HMiller EBaker KNaidu RJKiessell, IE WT0rders, SRI, McGuire, RII ,
GASchnebli, RII l
l l
l
- See previous page for concurrences.
l VPB:D0AVT ASC/VPB:00AVT ABC/VPB:DOAVT l KNaidu:tt* EBaker* EMerschoff*
l 4/8/87 4/8/87 4/9/87 i
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VALVE AND VALVE OPERATOR IMPROVEMENT PROGRAM ..
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PRESENTATION ON ROTORK ACTUATORS AGENDA INTRODUCTION - DON GABRIEL I. BACKGROUND INFORMATION - DON GABRIEL II. OPERABILITY VERIFICATION - TERRY EDWARDS III. ACTUATOR TEST BENCHES - TIM CLINE IV PROGRAM DIRECTION - NEAL ESTEP V. TECHNICAL QUESTIONS - ALL i
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- 1. BACKGROUND INFORMATION A. METHODS FOR INITIAL SETTING OF TORQUE SWITCHES B. METHODS FOR POST-MAINTENANCE CERTIFICATION C. DATA VARIATIONS IN TORQUE VALUES
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Rotork Contrds Inc.
Nucioar Tost Cortificato
'Otorit n'estT*#L24 Enclosure Date f@uttomer P.O.
Actuator Type Model hoo No.
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Performance Test l Open Closed Mit:r Details Motor. Check Condition Light run LblFt Amp LblFt Amp h!!iS No. Poles Torque setting 1 min E.ta%3 W/ gear ratio Torous setting 2 l@oecification Flashed at Torque setting 3 f?nermostat Trip RPM Torque setting 4 Torcue setting 5 max (Insulation class Stalled l
Toroue set at Test voltage V Hz Ph
@lectrical Check 100 (Continuity checked to diag.
(Control circuit flashed at f A.O.P.1 pot. value obtained 80 l Cust. voltage V Hz Pn k a3 l
51 m E
Mechanical Check 4B of 40 USwitch Ratio
$=$
20 Leadscrew Turn Set At _
D ection of Act. 0 1 2 3 4 5
- Torque Switch Setting leseected by Tested by Rig No.
Seccnd Stage Operators Final Inspnction Tyoe F a D:rection cf output Caole Entries D/S Retainer Cover Tube Drive Sleeve 5:'e aad Keyway Dimensions Stub snaf t! ped. Tags
- :tuator & Gearbox Special Paint Special Labels
. . ; . Fun Carrent Miscelaneous C e: Red cy
- Checked by Final inspected by Outside Inspection Approved by s
CC1 Rev I
II. OPERABILITY VERIFICATION A. TORQUE SWITCH LINEARITY f
B. EVALUATE SIGNIFICANCE OF FINDINGS C. SHORT TERM CORRECTIVE ACTION EVALUATION ,
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.I WORST CASE TOROUE CURVE im /
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- Sheet 1 McGuire Nuclear Station '
.r Unit 1 Rotork EMD Evaluation /s. # / 3 1
I. Valves Which are Acceptable "As Is" - These valves will require no action with the exception of torque switch setting verification.
A. Valves set on Max. Torque - No change required based on the operators being set to provide maximum output at the "5" setting which due to gg sample testing, are considered, with a high level of confidence, to be '
B. Operability Statement - Valve is expected to perform it's safety 25 ;
function based on analysis of system and valve conditions during a postulated accident.
C. Valves Set on Less Than Max. Toraue - The revised expected torque output including the worst case Rotork torque curve value deviation 4s j) 1 areater than the required torque under maximum aP system conditions.
Non-Safety - Valves which were deleted because they do not receive 1E -d f D.
power and have no safety function.
Power Removed - Valves which will be placed in their safety position /3 E.
and power removed until the next outage, i
II. Valves Which Require Torque Switch Channes - The revised expected torque output including the worst case Rotork torque curve value deviation is less J4 l
l than the required torque under maximum aP system conditions.
III. Valves Which Reauire Testine - These valves have limitations on maximum applied torque ana require testing to verify they meet the required torque for operation.
Bench Test - The operator is set to a specific torque value on the iC #*I A.
test bench.
B. AP Test - Valve / operator combination tested in the system under j; maximum system aP conditions which the valve will experience in the accident condition. .
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C. Strain Gace Test - Valve operator performance is verified in place by the use of strain gauges.
IV. Total Unit i Valve Population Evaluation -
A. This item is the total valve population evaluated by Design Engineer-in.q which is the total for parts I, II and III above. , ;f f ,.
III. ACTUATOR TEST BENCHES A. GENERAL THEORY OF OPERATION B. TEST BENCH TOLERANCES C. TEST BENCH TOLERANCE INVESTIGATION lciLl;,IG"'k' g,, - ).' t Io ?
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000 0 TEST NO./.[q3.7 TORQUE SCALE: 8.3 cv/ft-lb tv 1070 ft-lb/of.7 ,
THD SCALE: 10 v/ inch v / /s inches 01/1 CURRENT SCALE: 100 m:v/ amp cv 2 39.0 ccpn 2.3T 14NAl-43 B4058F1 (TS. TO. TMD, CUR) , ,
V/0 1.000e1 Vy -3.4400000e1 T/0 2.500e0 TL .-l.8000e1 7 '
V/0 5.000e-1 Vy -4.920000e-1
- T/0 2.500e0
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TL -1.8000e1 i f f I I t i b "F TORQUE SWITCli SETTING q"
TL ' ' " ' " " ~ ' " " ' ' " ^ ~ " ' " ' -?L- 3 VX tilHi t i!UN Ol'E N CLOSED PEAK HOLD IlEADING #2 O FT-LBS DISK NO./ LOCATION P //y I No. OF liRAKES t/
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IV. PROGRAM DIRE *; TION A. M0V UPGRADE PROGRAM - 5 YEAR PLAN i
B. PREVENTATIVE MAINTENANCE PROGRAM C. M0V RESEARCH 3
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V. TECHNICAL QUESTIONS l
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