ML20154P678
| ML20154P678 | |
| Person / Time | |
|---|---|
| Site: | Cooper  |
| Issue date: | 09/20/1988 |
| From: | Kuncl L NEBRASKA PUBLIC POWER DISTRICT |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| IEB-85-003, IEB-85-3, NUDOCS 8810030147 | |
| Download: ML20154P678 (18) | |
Text
_
e N Nebraska Public Power District _--.---- " * "?ttcE GENERAL OFFICE
= - - - - - - -
September 20, 1988 U.S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, DC 20555
Subject:
ltesponse to IE Bulletin No. 85-03, Final Report Cooper Nuclear Station NRC Docket No. 50-298, DPR-46
References:
- 1) IE Bulletin No. 85-03, dated November 15,1985; "Motor Operated Valve Common Mode Failures During Plant Transients Due to Improper Switch Settings"
- 2) IE Bulletin No. 85-03, Supplement 1, dated April 27, 1988; "Motor Operated Valve Common Mode Failures During Plant Transients Due to Improper Switch Settings" Gentlemen:
Pursuant to Action Item (f) of the above references, Nebraska Public Power District is submitting the enclosed written report on completion of the switch setting program for select motor-operated valves in the liigh Pressure Coolant Injection and Reactor Core Isolation Cooling Systems at Cooper Nuclear S tation. No further submittals on IE Bulletin 85-03 are planned.
Should you have any questions or require additional information, please call.
Sincerely yours,
/
L. G. Kunct Nuc! car Power Group Manager LGK/mtb:dmr9/20(1A)
Enclosure cc:
Regional Administrator USNRC - Region IV NRC Senior flesident inspector Cooper Nuclear Station uuluvavigf cavygv M
PDR ADOCK 05000298 i{g O
PDC Y TlN d'l 0 0 $O SE Ul*Yl $ Y.~ b l
_, j.).h
{&
S:pt:mber 20, 1988 Pcge 2 STATE OF NEBRASKA)
) as PLATTE COUNTY
)
L. G. Kuncl, being first duly sworn, deposes and says that he is an authorized representative of the Nebraska Public Power District, a public corporation and political subdivision of the State of Nebraska; that he is duly authorized to submit this report on behalf of Nebraska Public Power District; and that the statemento contained herein are true to the best of his knowledge and belief.
L. G. Ku cl this day of Subscribed in my presence and sworn to before me of C, 1988.
i Nota"" D"hHa MW WiMYse W acons COLLEEN bl. NUTA d
W CHut he Asg 4. m
IE BULLETIN 85-03 RESPONSE
1.0 INTRODUCTION
The objective of this report is to provide a response to the requirements of IE Bulletin 85-03 for Nebraska Public Power District's Cooper Nuclear Station (CNS).
IE Bulletin 85-03 pertains to motor-operated valve common mode failures resulting from improper switch settings during plant transients and accidents.
The requirements of the bulletin were broken down into two phases, which are responded to below.
Phase I of the response corresponds to Action Item A of the bulletin.
2.0 PHASE I RESPONSE Action Item A requires the licensee to identify and document the design basis for all motor-operated valves in high pressure systems, establish a tentative schedule for implementation of Phase II, and submit this information to the NRC.
Nebraska Public Power District's Phase I response to the initial requiretents of IE Bulletin 85-03 was submitted to the NRC on May 15, 1986 (Reference 3).
On November 25, 1986, Nebraska Public Power District submitted an amended response to the initial requirements of IE Bulletin 85-03 (Reference 4), listing revisions to the maximum expected differential pressures for the bulletin motor-operated valves.
These revised pressures were determined in accordance with a methodology developed by the BWR Owners Group and submitted to the NRC as i
Report NEDC-31322 (Reference 1).
The revised response also provided l
additional information requested in the letter from J. E. Gagliardo to J. H. Pilant dated July 22, 1986 (Reference 6).
On April 27, 1988, the NRC issued NRC Bulletin 85-03, Supplement 1.
This supplement, which is directed to license holders for boiling water reactors, was issued to clarify 1) which valves are to be included and
- 2) the meaning of the phrase, ".... inadvertent equipment operations (such as inadvertent valve closures or openings)...." as used in the bulletin.
Nebraska Public Power District sent a response to Supplement I to the NRC on June 2, 1988 (Reference 5).
Nebraska Public Power District also particioated in the BWR Owners Group response to the supplement, which was submitted to the NRC in July, 1988 as NEDC-31322, Supplement 1 (Reference 2).
3.0 PHASE II RESPONSE Nebraska Public Power District's Phase II Response is divided into three sections. The three sections correspond to Action Items B, C, and D of IE Bulletin 85-03.
3.1 Policies and Procedures for Establishing Correct Switch Settings.
Action Item B:
"Using the results of "A" above, establish the correct switch settings.
This shall include a program to review and revise, as necessary, the methods for selecting and setting all switches (i.e., torque, torque bypass, position limit, overload) for each valve operation (opening and closing)..
If the licensee determines that a valve is inoperable, the licensee shall also make an appropriate justification for continued operation in accordance with the applicable Technical Specification."
Response
3.1.1 Limitorque Switch Setting Policies.
a)
Open torque switches.
All of the open torque switches in IE Bulletin 85-03 motor operated valves at CNS are 100% bypassed. This is accomplished by the installation of a jumper across the open torque bypass limit switch (typically, LS-5).
This jumper is specified by a note on the first sheet of the General Electric element &ry diagrams for the HPCI and RCIC systems.
Because the open torque switch does not exist from the electrical control circuit standpoint for these motor operated valves, an open torque switch setpoint is not applicable.
b)
Open limit switches.
The open limit switch (typically, LS-4) must be adjusted to prevent inadvertent backseating of the valve.
Typically, the open limit switch will be set at i
approximately 8% of stroke from the open-to-close positions.
It is recognized that the amount of stem travel after limit switch trip is influenced by the inertia of the motor operated valve assembly, valve design, and delay in motor contactor drop out after actuation of the open limit switch.
Therefore, a generic setpoint for the open limit switch cannot be established.
Instead the following process will be used:
The limit switch will be set initially for 8% of the I
total number of handwheel turns for a full close l
stroke.
The valve will then by cycled open and l
allowed to trip electrically.
Plant personnel will then place the operator in manual handwheel operation and continue to open the valve.
If the valve can be opened an additional amount past the trip and coast down position, the switch is set correctly.
If the valve cannot be opened past the trip and coast down position, it can be assumed that the valve has backseated.
In the unlikely event that the valve has inadvertently backseated, a MOVATS signature analysis.
=.
~~
test will be conducted per'CNS Maintenance Procedure 7.3.35.1, and the stem and backseat loading and j
subsequent stem and backseat stress levels will be evaluated.
The limit switch setting will then be increased in 2% increments and the valve will be cycled and checked until it is ferified.that the disc l
is not coasting into the backseat.
c)
Open indication limit switches.
[
The policy to be utilized at CNS for the open J.
indication limit switch (typically, LS-3) will be to have the open indication limit switch set at the same point as the open limit switch.
l d)
~0 pen torque bypass limit switches.
1
]
For all of the 18 Bulletin 85-03 motor ' operated i
valves at CNS, the open torque bypass limit switch 1
does not exist from the electrical control circuit standpoint. Therefore, an open torque bypass limit switch setpoint is not applicable.
(See Item a.)
t e)
Close torque switch.
i The close torque switch ensures that sufficient loads l
A are delivered to the valve stem and disk to provide i
~'
1eak tight cbsure of the valve.
To establish the close torque switch setpoint, the closing thrust value for the maximum expected differential pressure conditions must be accurately established.
The thrust required to overcome the maximum expected differential pressure condition was obtained from i
MOVATS Incorporated of Kennesaw, Georgia. The method l
used by MOVATS to obtain this thrust requirement is l
explained below.
4 l
The M0 VATS differential pressure (DP) test data base J
j contains the results of MOVs that have been tested under actual DP conditions.
With sufficient data i
j points for a particular type of valve included in the data base, it can be used to predict thrust 4
j requirements for valves of that particular type, in iieu of performing DP testing to determine the thrust requirements.
1 There will be sufficient data points in the data base, if there are four or more data points f rom i
valves of the same type, manufacturer, orifice diameter, and stem diameter; or if there are 20 or l
more data points from valves of the same type.
4
' 1 i
Linear regression is performed on the DP test data points to find the equation for the "best-fit" line through the data.
After a thrust value is predicted for the valve using the "best-fit" equation, a 90%
confidence band, or tolerance is calculated and then added to the predicted thrust to obtain the thrust, above running load, required by the valve to be able to operate against the maximum expected differential pressure (DP Thrust Requirement).
Standard statis-tical analysis morhods are applied for deriving the confidence intet;ai.
All data used in the calcula-tions is available for review at MOVATS, Inc. in Kennesaw, Georgia.
Af ter the calculated DP thrust requirement has been determined, it will be compared to the maximum allowable loading limit for the particular motor operated valve assembly.
This limit is the lowest of the following four values:
1.
The maximum allowable seating thrust as specified by the valve vendor.
2.
The maximum thrust rating of the Limitorque operator.
3.
The maximum thrust capability of the spring pack installed in the Limitorque operator.
4 The maximum reduced voltage thrust generating capability of the Limitorque operator.
The calculated closing DP thrust, plus any running load, should not exceed any of the four limits.
j After an acceptable closing DP thrust (T has been determined, some value must be added to h)eflect all of the expected instrumentation and equipment variables. These variables are as follows:
i Operator / Torque Switch Repeatability 210% (Thrust less 4000 lbs.)
1 5% (Thrust greater than 4900 lbs.)
MOVATS Inctrumentation Accuracy 50K Load cell 22% of Load 14% Linearity 200K Load Cell 21.9% of Full Scale Nicolet Scope 20.2% of Voltage Range (10V)
TMD Linearity 10.6% of 10 Volt Scale. -
4 These tolerances are combined to produce a minimum target closing DP thrust of 1.15 (T ) for stem thrust and 1.10 (T,) ior stem thrust less than 4000 lbs.
greater than 4000 lbs.
After the close torque switch nas been set, the thrust at the actual trip setpoint, plus any measured running load, will be verified to be less than the maximum allowable loading limit for the particular motor operated valve assembly.
f)
Close limit switches.
All of the IE Bulletin 85-03 motor operated valves at CNS are torque seated. A close limit switch is not utilized.
Therefore, a close limit switch setpoint is not applicable.
g)
Close indication limit switch For those IE Bulletin 85-03 motor operated valves at CNS that have an active safety function to close (i.e.,
containment isolation), a special control circuit is employed that causes the close indication limit switch (typically, LS-7) to act as the close torque bypass switch for. automatically actuated open-to-close operations.
For this reason, the i
relative timing of the close indication limit switch setpoint and the close torque switch setpoint is very important.
It is imperative that the close indication limit switch contacts open prior to the close torque switch contacts opening.
Typically, the close indication limit switch will be set within 3% of the total number of handwheel turns for a full valve stroke from the close-to-open l
positions.
When setting up a motor operated valve assembly using the H0 VATS equipment and Maintenance 2
i Procedure 7.3.35.1 it is possible to determine the time differential between switch actuations precisely.
h)
Close torque bypass limit switches.
Typically, the close torque bypass limit switch (typically, LS-1) is of no operational concern because large hamnerblow loading conditions do not occur during the initial phases of the closing cycle.
For this reason, no specific requirements are placed on this switch setting relative to the valve stroke.
I i)
The overload relays in the motor starters for all of the IE Bulletin 85-03 valves at CNS are wired for alarm only.
The setpoints of the overload relays have been selected as recommended by Limitorque.
3.1.2 Switch Setting Procedures.
Cooper Nuclear Station Maintenance Procedure 7.3.36, "Limit and Torque Switch Checkout and Adjustment for Rising Stem Limitorque Motor-Operated Valves", provides directions to CNS maintenance personnel for the proper opening and closing setting of torque and limit switches in the Limitorque motor-operated valves.
This procedure also serves as the switch setpoint document for the safety-related, motor-operated, rising stem valves.
3.2 Setting of Switches and Baseline Signature Analysis Testing.
Action Item C:
"Individual valve settings shall be changed, as appropriate, to those established in item B above.
Whether the valve setting is changed or not, the valve will be demonstrated to be operable by testing the valve at the maximum ditierential pressure determined in item A abuve with the exception that testing motor-operated valves under conditions simulating a break in the line containing the valve is not required. Otherwise, justification should be provided for any cases where testing with the maximum differential pressure cannot practicably be perf o rmed.
This justification should include the alternative to maximum differential pressure testing which will be used to verify the correct settings.
Each valve shall be stroke tested, to the extent practical, to verify that the cettings defined in item B above have been properly implemented even if testing with differential pressure cannot be p e r f o rmed."
Response
NOTE:
Summarios of the technical data acquired by the CNS testing program are given in tables I,
II, and III (attached).
The notes accompanying the tables provide further details.
3.2.1 Motor-operated valve testing during 1986 Refueling Outage at CNS.
As found signature testing was performed on all of the IE Bulletin 85-03 valves at CNS using test equipment and field engineers supplied by MOVATS Incorporated.
1 \\
Thrust requirement values supplied by General Electric were used to set the close torque switch of each valve.
The thrust at torque switch trip was verified by the MOVATS thrust and switch signaturas taken and analyzed by j
MOVATS field engineers.
Detailed signature analysis for all of the bulletin valves was performed by MOVATS and i
a Detailed Analysis Reports are on file at CNS. All of the bulletin valves were found to have no immediate l
operational concerns in their as-left conditions. The as-found data listed in tables I, II, and III (attached) was obtained by the MOVATS testing performed during the 1986 Refueling Outage.
3.2.2 IE Bulletin 85-03 engineering and training activities in s
1 preparation for the 1988 Refueling Outage, j
MOVATS testing equipment and software were purchased by Nebraska Public Power District to give CNS the in-house
]
capability to perform testing and detailed - signature j
analysis.
Seven CNS personnel completed the MOVATS Data l
Acquisition Training Course at the MOVATS. Training Center.
Additionally, two CNS Engineering Department personnel i
completed the MOVATS Signature Analysis Training Course at the M0 VATS Training Center.
1 I
Maximum allowable seating at.d backseating thrust calculations for the IE Bulletin 85-03 valves were purchased from the Anchor Darling Valve Company and from
)
Crane Valve Company.
l General Electric had devised a plan (CNS Special Test Procedure 86-022) to perform differential pressure testing on seven of the bulletin valves h order to verify the thrust requirement calculations that had been used to set i
the close torque switches during the 1986 Refueling l
Outage.
A subsequent dett'l *. Tiaw of the DP test plan raised questions as to ta udtqu : y to satisfy the i
requirements of the bulletin.
.u;, as the industry data base of differential testina issults grew, thrust requirement calculations based on valve manufacturers' and Limitorque's formulations were proving not to be adequate.
l Accordingly, the reported favorable response from the NRC j
to the proposed plan of the Union Electric Company to j
j substitute thrust requirement calculations based on the MOVATS data base for actual DP testing at their Callaway l
plant, led to the Nebraska Public Power District decision to pursue this alternative approach, Data base thrust calculations were subsequently secured from MOVATS for all j
of the CNS bulletin valves and the justification for the j
alternative to differential pressure testing at CNS is delineated in the Switch Setting Policy for close torque l
switch in 3.1.1.d. above.
l j 1
I t
.l.2.3 Motor-operated valve testing during 1988 Refueling Outage at CNS.
Baseline signature analysis tests were performed on all of the bulletin valves at CNS. The testing was acewplished as directed by and documented by CNS Maintenance Procedure 7.3.35.1, "Testing of Motor-operated Valves Using Motor-Operated Valve Analysis", and conducted by CNS personnel vho had successfully coupleted training. at the MOVATS l
a Training Center.
The thrust and switch signatures for each valve were used to ensure that the as-left thrust at the close torque switch trip was in excess of the minimum target thrust i
requirement. The as-found (1986) and as-lef t (1988) data j
for the bulletin valves is summarized in tables I, II, and III (attached).
3.3 Procedured to Ensure That Correct Switch Settings Are Maintained j
Throughout the Life of the P'. ant.
1 Actior. Item D: "Prepare or revise procedures to ensure that correct I
switch settings are determined and maintained throughout the life of i
l the plant.
Ensure that applicable industry recommendations are
[
considered in the prepa. ration of these procedures."
(
l i
j
Response
f 3.3.1 The MOVATS Hotor Loaa Unit (MLU) and Motor Torque Unit j
(MTU).
(
1 j
The MLU measures motor output power which is proportional to the thrust applied to the valve stem.
The MLU is applicable only to alternating current motors.
The MTU l
measures motor output torque which is proportional to the i
thrust applied to the valve stem.
The MTU is arp11 cable only to direct current motors.
There are s.veral characteristics of the MLU and MTU that make them ideal for monitoring changes in a valve's condition.
Since the signatures are taken from the motor control center and require no valve contact, they are convenient to obtain.
MLU and MTU measurements are sensitive and repeatablel therefore, they can be used to observe and/or acasure f.'r changes in running thrust load, including loads that m
- t than preload, n U or MTU signa ures have been taken with the valve own condition, subsequent MLU or MTU signatures can
.Aen on a periodic basis and observed for changes
^
cative of degrading conditions.
Af ter MLU or MTU sine signatures have been taken and recorded, the MLU ad HTU can be used to establish a threshold vslue.
If the thrust required to overcome max-a differential L j
.A
pressure conditions is subtracted from the available thrust measured at torque switch trip, the result is the maximum allowable running load or threshold load.
k' hen the valve is tested from its cotor load center, the average running Icad on the MLU or MTU signature is compared to the threshold value and to the baseline running load.
If the running load exceeds the threshold value, the valve may not fully operate to its required position under maximum differential pressure accident conditions and further testing and/or corrective maintenance would be required.
3.3.2 Preventive maintenance procedures for periodic monitoring of running thrust loading.
Maintenance Procedure 7.3.35.2, "Periodic Monitoring of Motor-Operated Valves Using the M07A'.'S hotor Load Unit",
and Maintenance Procedure 7.3.35.3, "Periodic Monitoring of Motor-Operated Valves Using the MOVATS Motor Torqua Unit", will provide direction to CNS personnel for monitoring MOV running thrust loading from the motor control center to ensure that the MOV is still capable of overcoming accident differential precsures to perform their safety-related functions.
The testing will be conducted and MLU or KrU and control switch signatures recorded, trended, and anclyzed once each two refueling cycles.
For those IE Bulletin 85-03 vaI res listed in tables I and II (attached), these preventive maintenance procedures will be initially implemented during the CNS Refueling Outage that is tentatively scheduled for the Spring of 1990.
Maintenance Procedures 7.3.3.52 and 7.3.35.3 are currently being developed and will be completed, reviewed, and approved by January 1, 1989.
k' hen approved, these two procedures will be entered in the CNS Preventive Maintenance Program.
3.3.3 Testing frequency requirements.
There are three basic levels of MOVATS testing that will be performed at CNS.
Level I: The complete baseline signature analysis test (Maintenance Procedure 7.3.35.1) will be performed under the following circumstances:
A.
The MLU or MTU threshold value is exceeded during periodic testing at the notor control center. _, - _ _ - - _ _ _ - _ _ _ _ _ _ _ _ _ _ - _ _ _ _ _ _ _ _ _ _ _ _ - _ _ _ - _ _ _ _ _ _
B.
Spring pack replacement, disassembly, or adjustment.
Level II: The thrust measurement test (Maintenance Procedure 7.3.35.1 - excluding the spring pack calibration pertion) will be performed under the following circumstances.
A.
Following torque switch adjustment.
B.
Following torque switch replacement.
Level III: The MLU or MTU test from the motor control i
center (Maintenance Procedure 7.3.35.2 or 7.3.35.3) will be performed eve ry second refueling outage as stated in 3.3.2 above.
3.3.4 Post-Maintenance testing.
For all other motor-operated valve maintenance activities not addressed by 3.3.3 above, post-maintenance testing requirements will be those of ASME Section XI.
4.0 REFERENCES
1.
General Electric BWR Owners Group Report on the Operational Design Basis of Selected Safety-Related Motor-Operated Valves, NEDC-31322,
]
dated September, 1986.
2.
General Electric BWR Owners Group Report on the Operational Design Basis of Selected Safety-Related Motor-Operated Valves, NEDC-31322, l
Supplement 1, dated Jaly, 1988.
l 3.
NPPD Response to Initial Requirements of IE Bulletin 85-03, dated May 15, 1986.
i 4.
NPPD Response to Initial Requirements of IE Bulletin 85-03, dated November 28, 1986.
I
?
5.
Letter from L.
G.
Kunci (NPPD) to U.S.
Nuclear Regulatory i
Comission, dated June 2,1988.
6.
Letter from J. E. Gagliardo (iRC) to J. M. Pilant (NPPD), dated July 22, 1986. - -
TABLE I - RCIC SYSTEM IE BULLETIN 85-03 RESPONSE - COOPER NUCLEAR STATION COMPONENT VALVE OPERATOR DESIGN MAX THRUST TORQUE THRUST AT TOR.
AS FOUND ID CODE DESC.
DESCRIPTION FUNCTION DP DP REQUIRED SW. SET S ITCH TRIP (4) OPERABILITY Anchor Limitorque Steam Supply 0: 1091 0: 7126 AF: 2.0 As Found: 2900 RCIC-MOV-M015 3" Gate SMB-000/5'i Inboard Isolation 1146 C: 1091 C: 6154 AL: 3.75 As Left: 7280 No Anchor Limitorque Steam Supply 0: 1091 0: 7126 AF: 2.5 As Found: 3880 RCIC-MOV-M016 3" Cate SMB-000/5'# Outboard Isolation 1146 C: 1091 C: 6154 AL: 3.75 As Left: 6878 No
.1nchor Limitorque Supply From 50 0: 29 0: 2185 AF: 1.r As Found: 3180 RCIC-MOV-M018 6" Cate SMB-000/5'i ECST C: 14 C: 2438 AL: 1. )
As Left: 2840 Yes Anchor Limitorque Discharge 14,000 (1)
RCIC-MOV-M020 4" Cate SMB-00/10'i Block Valve 1925 0: 1222 0: 9839 N/A 21,446 (2)
Yes Anchor Limitorque Injection 14,000 (1)
RCIC-MOV-M021 4" Cate SMB-00/10'# Valve 1925 0: 1222 0: 9839 N/A 27,462 (2)
Yes Crane Limitorque Minimum Flow 0: 1325 0: 7665 AF: 1.5 As Found: 14620 RCIC-MOV-M027 2" Globe SMB-00/15'i to Torus 1500 C: 1338 C: 7665 AL: 1.75 As Left: 9380 Yes Anchor Limitorque Test Return C: 1230 C: 14043 AF: 1.75 As Found: 15440 RC* ;-MOV-M030 4" Globe SMB-0/15'#
to ICST 1925 (3)
AL: 2.0 As Left: 17800 Yes l
l Aachor Limitorque Supply from 0: 88 0: 4778 AF: 1.5 As Found: 3200 l
RCIC-MOV-M041 6" Cate SMB-000/5'# Torus 50 C: 65 C: 2999 AL: 1.5 As Left: 4140 Yes l
Anchor Limitorque Steam Supply 14,000 (1)
RCIC-MOV-M0131 3" Globe SMB-00/10'# to Turbine 1146 C: 1091 0: 9469 N/A 29,877 (2)
Yes Crane Limitorque Auxiliary Cooling 8,000 (1)
RCIC-MOV-M0132 2" Globe SMB-000/5'# Water Supply 1500 0: 1311 0: 7632 N/A 36,729 (2)
Yes Page 1 of 2
l l
TABLE I - RCIC SYSTEM (Continued)
NOTES:
1.
MOVs only safety-related function is to open. The open torque switch 14 100% bypassed. This number is the thrust rating of the Limitorque operator.
2.
MOVs only safety-rdated function ic to open. The open torque switch is 100% bypassed. This number is the reduced voltage 4 tall t'm.dt capability of the Limitorque operator.
3.
The maximum DP listed in Reference 5 was 1299 psi, and was derived from the RCIC pump discharge pressure at the minimum flow rate of 50 gpm. The value used to determine the maximum required thrust for the closing of this valve due to an inadvertent operation was 1230 psi and was derived from the RCIC. pump discharge pressute at rated flow and speed.
It was assumed that the Control Room operators starts to close the test return valve before the injection valve starts to open and all of the system flow is through the test return line.
4.
All of the as-found and as-left torque switch settings and thrust at torque switch trip values listed are for the open to close direction. All of the open torque switches in the Bulletin 85-03 MOVs are 100% bypassed.
Page 2 of 2
TABLE II - HPCI SYSTDi IE BULLETIN 85-03 RESPONSE - COOPER NUCLEAR STATION COMPONENT VALVE OPERATOR DESIGN MAX THRUST TORQUE THRUST AT TOR.
AS FOUND ID CODE DESC.
DESCRIPTION FUNCTION DP DP REQUIRED SW. SET SWITCH TRIP (4) OPERABILITY Anchor Limitorque Steam Supply 45,000 (1)
HPCI-MOV-M014 10" Cate SB-1/60'#
to Turbine 1146 0: 1091 0: 33892 N/A 54,743 (2)
Yes Anchor Limitorque Steam Supply 0: 1091 0: 33892 AF: 3.0 As Found: 33960 i
HPCI-MOV-MOIS 10" Cate SMB-1/25'#
Inboard Isolation 1146 C: 1091 C. 30184 AL: 3.0 As Left: 39416 Yes Anchor Limitorque Steam Supply 0: 1091 0: 33892 AF: 2.0 As Found: 17980 IIPCI-MOV-M016 10" Gate SMB-1/40'#
Dutboard Isolation 1146 C: 1091 C: 30184 AL: 2.5 As Left: 37723 No l
Anchor Limitorque Supply From C: 14 AF: 1.0 As Found: 6600 l
HPCI-MOV-M017 16" Cate SMB-00/15'# ECST 150 (4)
C: 3179 AL: 1.0 As Left:
8717 Yes l
Anchor Limitorque 140,000 (1)
HPCI-MOV-M019 14" Gate SB-3/150'#
Injection Valve 1925 0: 1118 0: 56724 N/A 287,576 (2)
Yes Anchor Limitorque Discharge 0: 1113 140,000 (1)
HPCI-MOV-M020 14" Cate SB-3/150'#
Block Valve 1925 (3) 0: 56724 N/A 287,576 (2)
Yes Anchor Limitorque Test Return C: 1245 AF: 2.25 As Found: 76200 HPCI-MOV-M021 14" Clobe SMB-3/150'# to ECST 1925 (5)
C: 63458 AL: 2.25 As Left: 75800 Yes Anchor L5:ltorque Minimum Flow 0: 1326 0: 14781 AF: 1.75 As Found: 11560 S8-1/40'#
to Torus 1500 C: 1340 C: 14781 AL: 1.0 As Left: 18940 No HPCI-MOV-M025 4"
s Anchor Limitorque Supply from 0: 98 0: 12123 AF: 3.0 As Found: 10720 HPCI-MOV-M058 16" Gate SMB-00/15'# Torus 150 C: 64 C: 6402 AL: 2.0 As Left:
9140 Yes l
l l
l l
l Page 1 of 2 i
TABLE II - HPCI SYSTEM (Continued)
NOTES:
1.
MOVs only safety-related function is to open. The open torque switch is 100% bypassed. This number is the thrust rating of the Limitorque operator.
2.
MOVs only safety-related function is to open. The open torque switch is 100I bypassed. This number is the reduced voltage stall thrust capability of the Limitorque operator.
3.
The maximum DP value Itsted in Reference 5 was 1118 psi, and was derived using the formula for the HPCI injection valve from Reference 1.
The formula for tl e HPCI pump discharge valve from Iteference 2 yields the listed value.
4.
Reference 2 provides a formula for determining the maximum DP in the opening direction for this valve because of possible inadvertent closure by the Control F m operator. At CNS, such.2n imdvertent closure is not possible because of an electrical interlock between the two HPCI suction vn!ves. This interlock makes it impossible to close either of the suction valves unless the other suction valve is open.
5.
The maximum DP value listed in Reference 5 was 1284 psi, and was derived from the HPCI pu.ap discharge pressure at the minimum flow rate of 450 gpe. The value used to determine the maxirms required thrust for the closing of this valve due to an inadvertent operation was 1245 psi and was derived from HPCI pump discharge pressure at rated flow and speed.
It was assumed that the Control Room operator starts to close the test return valve before the injection valve starts to open and all of the system flow is through the test return line.
6.
All of the as-found and as-left torque switch settings and thrust at torque switch trip values listed are for the open to close direction. All of the open torque switches in the hulletir. 85-03 MOVs are 100% bypassed.
e Page 2 of 2 m-w-we :. - ---,-- -
xer-
,w---N
TABLE III - AS-FOUND OPERABILITY
SUMMARY
i
(
IE BULLETIN 85-03 RESPON3E - COOPER NUCLEAR STATION COMPONENT REQUIRED LIMITINC MAXIMUM DP AS-FOUND AS-FOUND II: CODE PJNCTION PARAMETER (1)
THRUST REQ.
STATUS (2)
OPERABILITY RCIC-MOV-MOIS Open Stall Thrust 7,126f 7,920f Yes l
Close T.S. Setting 6,154#
2.900f No RCIC-MOV-M016 Open Stall Thrust 7,126f 25.048f Yes l
Close T.S. Setting 6,154f 3,880f No RCIC-Mov-M018 open Stall Thrust 3,650f 15,103f Yes Close T.S. Setting 2,438f 3,180E Yes RCIC-MOV-M020 Open Stall Thrust 9,839#
21,4667 Yes f.CIC-MOV-M021 Open Stall Thrust 9,839f 27,462#
Yes RCIC-MOV-M027 Open Stall Thrust (3) 7,6651 31,000f Yes Close T.S. Setting 7,665#
14,620f Yes RCIC-MOV-M030 Close T.S. Setting 14,043#
15,440f Yes l
RCIC MOV-M041 Open Stall Thrust 4,778f 15.103#
Yes Close T.S. Setting 2,999f 3.200f Yes RCIC-MOV-M0131 Open Stall Thrust (3) 9,4697 29,877f Yes RCIC-MOV-M0132 Open Stall Thrust (3) 7,632f 36,729f Yes HPCI-MOV-MC14 Open Stall Thrust 33,892f 54,743#
Yes HPCI-MOV-M015 open Stall Thrust 33,892f 36.123#
Yes Close T.S. Setting 30,184f 33,960f Yes HPCI-MOV-MOl6 Open Stall Thrust 33,892#
88,446f Yes l
Close T.S. Setting 30,184#
17,980#
No t
l l
l l
Page 1 of 2 i--
i I
l l
TABLE III - AS-FOUND OPERABILITY
SUMMARY
(Continued)
COMPONENT REQUIRED LIMITING MAXIMUM DP AS-FOUND AS-FOUND ID CODE FUNCTION PARAMETER (1)
THRUST REQ.
STATUS (2)
OfERABILITY I
HPCI-MOV-M017 Close T.S. Setting 3.179#
6,600f Yes HPCI-MOV-M019 Open Stall Thrust 56,724#
287,576#
Yes i
IIPCI-MOV-M020 Open Stall Thrust 56,724f 287,576f Yes HPCI-MOV-M021 Close T.S. Setting 63,458#
76,200f Yes HPCI-MOV-M025 Open Stall Thrust (3) 14,781#
59,563#
Yes l
Close T.S. Setting 14.781#
11.560f No I
HPCI-MOV-M058 Open Stall Thrust 12.123f 38,859f Yes Close T.S. Setting 6,402f 10,720f Yes NOTES:
1.
For those valves with a safety-related function to close, the limiting parameter is the thrust generated at the trip point of the close torque switch.
For those valves with a safety-related function to open, the limiting parameter is the operstor's reduced soltage stall thrust capability.
Because the open torque switch is 100%
bypassed, the operator vill supply the thrust recuired up to the point of motor stall. The CNS Plant Engineering Department has verified that the maximum required DP thrust, for the close to open direction, does not exceed the maximum thrust rating of the Lirtitorque operator.
20 For the open to close direction, the as-found status is based on the thrust measured at the r, rip point of the close torque twitch, during the 1986 Outage.
This measurement was taken prior to any adjustments, maintenance, or modifications to the MOVs.
For the close to open direction, the as-founa status is based on the reduced voltage stall thrust capability of the MOV.
30 For globe valves with flow under the seat, opening DP thrust requirements are typically zero.
However, to be conservative, the same DP thrust valves determined for the close direction have been used for the open direction.
Page 2 of 2
_