Text

Forwards Response to RAI Re GL 95-07, Pressure Locking & Thermal Binding of SR Power-Operated Gate Valves
	ML20148R385
Person / Time
Site:	Grand Gulf
Issue date:	06/30/1997
From:	Hagan J; ENTERGY OPERATIONS, INC.
To:	; NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
	GL-95-07, GL-95-7, GNRO-97-00056, GNRO-97-56, NUDOCS 9707070379
	Download: ML20148R385 (110)
	v • d • e

a Ent:rgy oper;tions, Inc.

ot bson MS 39150 Tel 601437 6408 Fax 601437 2795 Joseph J. Hagan Vice President Operations rana cun neear stanon June 30, 1997 U.S. Nuclear Regulatory Commission Mail Station P1-37 Washington, D.C. 20555 Attention:

Document Control Desk

Subject:

Grand Gulf Nuclear Station i

Docket No. 50-416

)

License No. NPF-29 Response to Generic Letter (GL) 95-07 Request for AdditionalInformation GNRO-97/00056 Gentlemen:

Regarding GL 95-07, Pressure Locking and Thermal Binding of Safety-Related Power-Operated Gate Valves, Grand Gulf Nuclear Station (GGNS) has submitted responses dated October 11,1995 (GNRO-95/00113), February 13,1996 (GNRO-96/00011), and June 28, 1996 (GNRO-96/00078). The information requested in your May 1,1997 F<equest for i

Additional Information is attached for your use to complete the review of GGNS's response to GL 95-07.

Please contact Rita Jackson at (601) 437-2149 if you have questions regarding this submittal, j

Yours truly, hp 1

JJH/RRJ attachment:

esponse to NRC RAI w/ Appendices cc:-

(See Next Page) 9707070379 970630

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June 30, 1997 l

GNRO-97/00056 Page 2 of 2 j

1 cc:

GGNS NRC Senior Resident inspector (w/a)

Mr. L. J. Smith (Wise Carter) (w/a)

Mr. N. S. Reynolds (w/a) i Mr. H. L Thomas (w/o)

Mr. J. W. Yelverton (w/o)

Mr. E. W. Merschoff (w/a)

Regional Administrator U.S. Nuclear Regulatory Commission Region IV 611 Ryan Plaza Drive, Suite 400 Arlington,TX 76011 Mr. J. N. Donohew, Project Manager (w/2)

Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Mail Stop 13H3 Washington, D.C. 20555 I

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GNRO-97/00056 rtesponse to NRC Request for Additional Information Generic Letter 96-07 i

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1. "The NRC staff reviewed the test report (14-inch William Powell Gate Valve) but the information necessary to independently verify the pressure locking test results was not in the report. Discuss the schedule when the test data can be provided to the staff."

' Response:

l The test data on the 14 inch William Powell gate valve is provided as Appendix 1 to this package.

2. "EOl stated that it intended to perform more testing to validate the model but a test schedule has not been developed to accomplish this testing. Discuss these additional tests and the schedule to complete the tests."

Response

EOl's draft test plan is provided in this response as Appendix 2. EOl currently anticipates the completion of testing by December 1997.

t 3a. " Discuss how the use of a 0.4 friction factor in the EOl pressure locking prediction equation accurately validates the EOl pressure locking prediction methodology in cases when the actual friction factor was significantly less than 0.47"

Response

During the April 9,1997 meeting, EOl's presentation reflected use of a 0.4 friction factor because they did not have access to the friction factors from the Commonwealth Edison test data. When validating the EOl methodology against '

actual test data, EOl uses the actual measured friction factor when it is available.

If no friction factor is available, EOl uses a 0.4 friction factor. This conservatively

. envelopes the actual test conditions, because the higher the friction factor, the higher the calculated required pullout thrust.

From a design standpoint, EOl uses a 0.4 friction factor when the. actual friction factor is less than 0.4. This will provlde conservative or higher calculated thrust values. This accounts for some of the variances shown in testing. Appendix 3 provides some comparisons of 0.4 and 0.2 friction factors.

l to-GNRO-97/00056

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3b. " Explain the basis for the applicability of the EOl pressure locking prediction methodology to all flexible wedge gate valves or for the use of the methodology to specific types of flexible wedge gate valves."

Response

~ The EOl calculation methodology is based on "first principle" analysis. EOl evaluates valves susceptible to pressure locking by calculating required pullout thrust at design conditions. There are few if any actual design conditions where upstream and downstream side pressures equals zero; however, where conditions dictated, these values were used. EOI believes that our method conservatively calculates thrust in the ranges where it is applied (i.e. design conditions). The EOl pressure locking analysis method establishes the disk pullout thrust by determining

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the forces imposed by the disk on the seat rings of the valve. This models the valve disk as two flat plates connected by a hub. The behavior of the plates under pressure is approximated by the application of flat plate formulas from Roark's formulas for stress and strain. EOl's method assumes that the differential pressure force from the side of the valve with the higher pressure is transmitted through the disk hub and imposed on the opposite seating surface. The EOl method calculates that the maximum required puliout force will occur when the valve's high side pressure equals the bonnet pressure and the low side's pressure equals zero.

3c. "Why do the EOl pressure locking thrust methodology prediction results conflict with the Walworth valve test results? Discuss if there are any differential pressure restrictions or other conditions associated with the use of the EOl pressure locking methodology."

Response

EOl can not determine why the EOl pressure locking methodology conflicts with the Walworth test results. Additional testing should help address various j

differential pressure conditions.

3d. " Discuss how differential flow test results can be used to validate EOl's pressure locking prediction methodology."

i

Response

Differential flow test provides additional data for valve loading conditions. EOl believes that DP loads approximate hydraulic locking. We utilize this data in our calculation methodology to compare measured and calculated thrust under comparable DP loads. This provides additional assurance of the application of EOl's pressure locking methodology.

, to:

GNRO-97/00056

)

3e. " Discuss why it is not necessary to address these parameters (disk shear forces, vertical downward force on the disk, compression of the disk hub and flexibility of the body and disk) in the EOl pressure locking prediction i

methodology."

i

Response

EOl does not consider disk shear forces, vertical downward force on the disk,

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compression of the disk hub and flexibility of the body and disk to be significant i

parameters based on our simplified conservative pressure locking model. EOl's methodology'is intended to determine a bounding pullout thrust, and we believe that our method conservatively calculates thrust in the ranges where it is applied (i.e. design conditions). We feel that consideration of these parameters would result in a more precise approximation of required thrust and therefore a reduction of conservative margin as established by our current method.

3f. " Discuss how this variance in unwedging force is accounted for in the EOl pressure locking prediction methodology."

Response

Variance in unwedging forces is not considered in the EOl pressure locking methodology. The unwedging force used in the EOl pressure locking method is the same unwedging force used in the Generic Letter 89-10 program.

4. Provide the pressure locking thrust ana actuator capability calculations for the nine valves that EOl said (in 180 day submittal) would operate during a pressure locking scenario. E12F028A & B, E12F064C, P41F064A & B, P41F081 A & B, P41F237, and P41F238.

Response

The pressure locking thrust and actuator capability calculation results are summarized and provided as Appendix 4 to this response. EOl would be willing to provide a detailed review and discussion of these calculations on-site, if necessary, to enhance NRC's understanding of the use and validity of our design-condition based methodology.

i Attachment i to-GNRO-97/00056

5. Discuss the basis for deciding not to evaluate shutdown cooling line suction valves (E12F006A, E12F008, & E12F009) for pressure locking and thermal binding.

Response

GL 95-07 specifies that valves with a safety function to open be evaluated for pressure locking. The shutdown cooling line suction valves have no safety function to open. E12F006A has active function to close manually for isolation of shutdown cooling suction for safety related modes of RHR. Valves E12F008 and E12F009 have an active function to close automatically for containment isolation, and to close automatically on a RHR isolation signal to prevent loss of reactor coolant inventory and to isolate the low pressure portion of RHR from the RCPB.

The shutdown cooling mode of the RHR system used during a normal reactor shutdown and cooldown is often referred to as the non-safety portion of the RHR system. The chutdown cooling mode utilizes most of the safety classified portions of the RHR system although this mode of operation is not so classified.

The system can accomplish its design objectives by a preferred means by directly extracting reactor vessel water from the vessel via the recirculation loop suction line and routing it to a heat exchanger and back to the vessel, or by an alternate means by indirectly extracting the water via relief valve discharge lines to the suppression pool and routing pool water to the heat exchanger and back to the vessel.

6. EOl evaluated eleven valves for pressure locking / thermal binding and determined that these valves were acceptable. "Are these eleven valves in systems that would be declared inoperable per Technical Specifications when surveillances are performed on the system? If not, explain why these valves are not susceptible to pressure locking / thermal binding."

Response

During surveillance testing these eleven valves are considered inoperable. This responso was also provided in GGNS's June 28,1996 transmittal to the NRC.

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GNRO-97/00056 l

APPENDIX 1 TEST DATA FOR 14-INCH WILLIAM POWELL GATE VALVE

" INSTRUMENTATION CHANNEL PARAMETER PLOTS 1 to Test Report No. 43008-01 for Entergy Operations"

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INSTRUMENTATION CHANNEL PARAMETER PLOTS ATTACHMENT ll TO TEST REPORT NO. 43008-01 FOR ENTERGY OPERATIONS

TEST C0f1PLETE i

6.3.3 PRESSURE LOCK TEST TESTiti a,b,c.

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TEST COMPLETE 6.3.3 PRESSURE LOCK TEST TEST #3 a 32 Al1PS OPEN TORQUE SWITCH 6

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TEST C0t1PLETE 6.3.3 PRESSURE LOCK TEST TESTe3 a S3 AMPS CLCSE TOEQUE SWITCH 6

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TEST COMPLETE 6.3.3 PRESSURE LOCK TEST TESTS 3 a S4 AMPS CLOSE BY-PASS SWITCH 6

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r H

o C

c T

e I

5 R

W S

., 1

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9 E

5 U

7 Q

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0 0

0 a

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i:.i.:i.:. :i

, 1 e0 E

m0 5

W

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tn t

i T

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S i

E E

t a

T U

k R

r T

u T

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i.::

.:.5

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6 T

W 0

K 0

C O

t L

e S

E a

ER t

TU a

ES P

D LS M

PE MR 1

0 0

8 W0 OP 0

0 0

0 C

0 0

0 3

0 0

3 TS3 8

6 4

2 2

4 6

8 4

E B

T6

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i i

TEST COMPLETE 6.3.3 PRESSURE LOCK TEST TESTn5 a (TORQUE SWITCH TRIPPED) 1 NU1 UAC L1 to NEUTRAL UOLTAGE 400 -

t 1

t i

i 0

i i

t i

-200 i

l i

i

-400

..i i

j i

I i

I a

i 5

10 15 20 25 secs time I

B430081 DataSet 006 Duration 00:00:25:759 Recorded On 12/Z9/92 09:02:04 i

i i

f i

l i

TEST Cat 1PLETE i

6.3.3 PRESSURE LOCE TEST TESTm5 a (TORQUE SWITCH TRIPPED) r t

PS1 PSIG UPSTREAf1 PRESSURE l

4%

.......:...........~.................................. -.

3 ZM _

...........g.....

8 1

-200 -

._400 _............:.....

5 10 15 20 25 secs tIMS B430081 DataSet 006 Duration 00:00:25:759 Recorded On 12/Z9/92 09:02:04

TEST COMPLETE 6.3.3 PRESSURE LOCX TEST TESTR5 a (TORQUE SWITCH TRIPPED)

PS2 PSIG DOWNSTREAM PRESSURE 1500

.....e.

1000

.e.

500 3

0

-500

-1000

-1500 5

10 15 20 25 secs time B430081 DataSet 006 Duration 00:00:25:759 Recorded On 12/29/92 09:02:04 9

h L

v

d t.

TEST COMPLETE 6.3.3 PRESSURE LOCK TEST TESTR5 a (TORQUE SWITCH TRIPPED) l S3 AMPS CLOSE TORQUE SWITCH 6

t 4

2_........... <..................................:............

1

_{

3...

_4 _..........:........

4............

i I

4 I

I I

5 10 15 20 25 secs s

t1Ne B430081 DataSet 006 Duration 00:00:25:759 Recorded On 12/29/92 09:02:04 t

i

m.

TEST C011PLETE 6.3.3 PRESSURE LOCK TEST TESTS 5 a (TORQUE SWITCH TRIPPED) i i

S4 At1PS CLOSE BY-PASS SWITCH-6 4

2 6

l i.-

i--- -

-- - -i.

-4 _

5 10 15 20 25 secs t1Me B430081 DataSet 006 Duration 00:00:25:759 Recorded On 12/29/92 09:02:04

TEST COMPL TE 6.3.3 PRESSURE LOCE TEST TESTS 5 a (TORQUE SWITCH TRIPPED)

SS AMPS OPEN BY-PASS SWITCH 6

4_

2.

0 i

-4 r

5 10 15 20 25 secs t184e B430081 DataSet 006 Duration 00:00:25:759 Recorded On 12/29/92 09:02:04 2

TEST COMPLETE 6.3.3 PRESSURE LOCK TEST TESTst5 a (TORQUE SWITCH TRIPPED)

TCZ DegF MOU IMLET TEMPERATURE g_

...... ~.

40 _

20 _

i 0

-20 _

...t......

-40

-60 _

1 5

10 15 20 25 secs tire B430081 DataSet 006 Duration 00:00:25:759 Recorded On 12/29/92 09:02:04 i

1

l t

L TEST COMPLETE i

6.3.3 PRESSURE LOCK TEST TESTn5 a (TORQUE SWITCH TRIPPED) l 1

31 AMPS OPEN LIMIT SWITCH I

6 I

i l

i 4

.5-2_

1 t

l t

i

-- -i - - - --

--i--- -

r L

i

?

-4 t

t L

j i

L 5

10 15 20 25 secs t

(

t u.se B430081 DataSet 006 Duration 00:00:25:759 Recorded On 12/Z9/92 09:02:04 a

e k

I I

i

TEST COMPLETE 6.3.3 PRESSURE LOCK TEST TESTt5 a (TORQUE SWITCH SET TO APROX. 1.5)

THH1 LB STEM THRUST 80000 _

c.......

60000 -

iM _

20000 _

.y..

-20000 -

-'i-

--i-

-(QQQQ _

4.....

..........;..........4..

-60000 _

-80000 I

I I

I 5

10 15 20 25 secs time B430081 DataSet 007 Duration 00:00:25:470 Recorded On 12/29/92 10:34:34 m

b TEST C0f1PLETE 6.3.3 PRESSURE LOCE TEST-TESTS 5 a (TORQUE SWITCH SET TO APROX. 1.5)

PS1 PSIG UPSTREAli PRESSURE 4

ZM _

0

-200 -

--:----------.i-----.:-

-400 _

i i

5 10 15 20 25 secs i

t1Re B430081 DataSet 007 Duration 00:00:25:4?O Recorded On 12/29/92 10:34:34 6

l.

TEST C0f1PLETE 6.3.3 PRESSURE LOCK TEST TESTS 5 a (TORQUE SWITCH SET TO APROX. 1.5) 1 PS2 PSIG DOWNSTREntt PRESSURE 1

1500 L

1000 500 i

i

........7_.

O

-500

-1000

........._i.

-1500 i

i.

i i

)

5 10 15 20 25 secs tine B430081 DataSet 007 Duration 00:00:25:470 Recorded On 12/29/92 10:34:34 f

F f

h

TEST C011PLETE-6.3.3 PRESSURE LOCK TEST TESTS 5 a (TORQUE SWITCH SET TO APROX. 1.5)

PS3 PSIG BONNET PRESSURE

--n-1500 -

1000 1

4............:..........,....

...;.......... 4

.....-n:

0

-500 -

......................~..................... -

4 1..

i i

i 5

10 15 20 25 secs time B430081 DataSet 007 Duration 00:00:25:470 Recorded On 12/29/92 10:34:34 9

1 TEST CONPLETE 6.3.3 PRESSURE LOCK TEST TESTS 5 a (TORQUE SidITCH SET TO APROX.1.5) 1 SPD IN SPRING PACE DISPLACENENT Z

1.5 - --- - - - i. - - --

-i..

I j.......... :

.i......... i...........j.

0.5 -

0

-0.5 _

-1

-1,5 _

t 5

10 15 20 25 secs p

time B430081 DataSet 007 Duration 00:00:25:470 Recorded On 12/Z9/92 10:34:34 d

i k

TEST C0t1PLETE 6.3.3 PRESSURE LOCK TEST TESTS 5 a (TORQUE SWITCH SET TO APROX. 1.5)

S3 Af1PS CLOSE TORQUE SWITCH 6

4 2_

0 1

-4 _

5 10 15 20 25 secs j

tire-6 B430081 DataSet 007 Duration 00:00:25:470 Recorded On 12/29/92 10:34:34 5

6 TEST COMPLETE 6.3.3 PRESSURE LOCK TEST TESTS 5 a (TORQUE SWITCH SET TO APROX. 1.5) i S4 AMPS CLOSE BY-PASS SWITCH 6

. 5.......

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4 2.

2

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l 0

i a

-i-- - -------j----

- - - - - i. -

..i............i.............:............:..........

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5 10 15 20 25 secs time B430081 DataSet 007 Duration 00:00:25:470 Recorded On 12/29/92 10:34:34 i

l TEST COMPLETE 6.3.3 PRESSURE LOCH TEST TESTit5 a (TORQUE SWITCH SET TO APROX. 1.5) 1 SS Al1PS OPEN BY-PASS SWITCH 6

.g....

4_

i 1

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2 i...........

g.........

0

--- - i---- - -

T-i

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i 5

10 15 20 25 secs time B430081 DataSet 007 Duration 00:00:25:470 Recorded On 12/29/92 10:34:34

-=

TEST COMPLETE 6.3.3 PRESSURE LOCK TEST TESTN5 a (TORQUE SWITCH SET TO APROX. 1.5)

TC2 DegF MOU INLET TEMPERATURE q.

g

.q..

...g.

40 g.

20

......g.......

-20 _

-40 g............,

....g.

...i....

..i..........

-60 _

I I

5 5

10 15 20 25 secs time B430081 DataSet 007 Duration 00:00:25:470 Recorded On 12/29/92 10:34:34

\\

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TEST C011PLETE 6.3.3 PRESSURE LOCK TEST TEST 25 a (TORQUE SEITCH SET TO APROX. 1.5)

THQ1 InLB STEM TORQUE v

i

...g.

4,,,

i i

5

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2 0

l.

p

-2000 i

4............*...........,...........;.....

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i i

i

-4000 -

...g......

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t

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5 10 15 20 25 secs time B430081 Dataset 007 Duration 00:00:25:470 Recorded On 12/29/92 10:34:34

i h

TEST COMPLETE 6.3.3 PRESSURE LOCH TEST TESTAS a (TORQUE SWITCH SET TO APROX. 1.5) b

\\

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6 l

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j i

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l

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5 10 15 20 25 secs time i

i B430081 DataSet 007 Duration 00:00:25:470 Recorded On 12/29/92 10:34:34 i

t i

- - f

t i

l TEST COMPLETE l

6.3.3 PRESSURE LOCK TEST TEST #5 a (TORQUE SWITCH SET TO APROX. 1.5) r i

i l

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F i

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1 50 -

i -

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r

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..i.....

. i.

..i..

......i.

i I

l i

i t

-j-

-100 - '

4--

- --l-5 10 15 20 25 secs time B430081 DataSet 007 Duration 00:00:25:470 Recorded On 12/29/92 10:34:34

r I

i 1

sce s

43 5

4 2

3 i :....::.,.::i:::-

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f LS P

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6 4

2 2

4 6

8 4

S3 E

B T6

l TEST C0t1PLETE l

i 6.3.3 PRESSURE LOCK TEST TESTS 5 a (TORQUE SWITCH SET TO APROX. 1.5) j MU1 UAC L1 to NEUTRAL UOLTAGE i

l i

I i

l 1

gg.....

i s

g-i i

i

-200 s

-400 i

i i

I I

i 5

10 15 20 25 secs time B430081 DataSet 007 Duration 00:00:25:470 Recorded On 12/29/92 10:34:34 l

TEST C0t1PLETE 6.3.3 PRESSURE LOCH TEST TESTS 5 a (TORQUE SWITCH SET TO APROX. 1.65) r THR1 LB STEf1 THRUST i

M_

60000 -

40000

......i............

20000

. i....

......i...............i..

0

^

i.

-20000 -

.- - --- - ----i.' --

-(QQQQ

-60000

-80000 i

i i

t 5

10 15 20 secs tInc i

B430081 DataSet 008 Duration 00:00:21:683 Recorded On 12/29/92 11:04:17 i

6 1

-n

..--. 2

~. - -... - - -..

I i

TEST COMPLETE l

i 6.3.3 PRESSURE LOCR TEST TESTAS a (TORQUE SWITCH SET TO APROX. 1.65) j 9

9 SZ AMPS OPEN TORQUE SWITCH l

i 6

t I

4 2_

i O

l i

l r --

- -- i f

i

...i........

i

-4 _

i t

i i

I 5

10 15 20 secs j

time

~

B430081 DataSet 008 Duration 00:00:21:683 Recorded On 12/29/92 11:04:17 i

i

TEST COMPLETE

- 6.3.3 PRESSURE LOCX TEST TESTS 5 a (TORQUE SWITCH SET TO APROX. 1.65)

PSZ PSIG DOWMSTREAM PRESSURE 1500 1

1hr

.....................................i....

500

..__......i..

7 i

i i

0

-500

~

i

-1000

-1500 i

5 10 15 20 secs time B430081 DataSet 008 Duration 00:00:21:683 Recorded On 12/Z9/92 11:04:17 k

L i

m

TEST COMPLETE 6.3.3 PRESSURE LOCK TEST TESTS 5 a (TORQUE SWITCH SET TO APROX. 1.65)

PS3 PSIG BONNET PRESSURE

. l i

......{,

{%

t.

i 1000

$QQ

-500

-1 5

-1 t

5 10 15 20 secs i

time B430081 DataSet 008 Duration 00:00:21:683 Recorded On 12/29/92 11:04:17 i.

u.-- -

. Sm s.-re-1.e' w

v e

e

)

TEST C0t1PLETE 6.3.3 PRESSURE LOCK TEST TESTS 5 a (TORQUE SWITCH SET TO APROX. 1.65).

PS1 PSIG UPSTREAli PRESSURE t

4M _

1 2M _...............

0

-200 -

--E

- - - i.-

-400

..............i.............. i..............i..............i...

i i

.5 10 15 20 secs tIRC B430081 DataSet 008 Duration 00:00:21:683 Recorded On 12/29/92 11:04:17 t

5 b

I L

.. ~.

TEST COMPLETE 6.3.3 PRESSURE LOCK TEST TESTN5 a (TORQUE SWITCH SET TO APROX. 1.65)

SPD IN SPRING PACE DISPLACEMENT 2

i i

1.5 -

--.--- i-

..i i

1 0.5 -

i..-..---

L-----...

i- - -- -

---.5-0

(

i i

z

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. -.-..-...i........-..b..

.......i.

-1

......i....

...i.............. i....

-1.5 -..-.---.... :.

.-...b..........

-.i.....

.. -.. - l..

5 10 15 20 secs time B430081 DataSet 008 Duration 00:00:21:683 Recorded On 12/29/92 11:04:17

t' TEST COMPLETE 6.3.3 PRESSURE LOCK TEST TESTS 5 a (TORQUE SWITCH SET TO APROX. 1.65) 31 AMPS OPEN LIMIT SWITCH 6

s 4_

5

~

t

~

2_

..........i.......

3 1

0 r

-- -- --i i

I t

i i

4 i

i i

i 1

5 10 15 20 secs time B430081 DataSet 008 Duration 00:00:21:683 Recorded On 12/29/92 11:04:17

'[

I

TEST C0t1PLETE 6.3.3 PRESSURE LOCH TEST TESTS 5 a (TORQUE SWITCH SET TO APROX. 1.65)

TRQ1 InLB STET 1 TORQUE i

40% _

.c

...............,~.......................

2000 _

O.

-2000 i

i t

t i

i

..............i

-4000 _

5 10 15 20 secs e

time B430081 DataSet 008 Duration 00:00:21:683 Recorded On 12/29/92 11:04:17 5

. m m.

i t

TEST COMPLETE i

6.3.3 PRESSURE LOCK TEST TEST #5 a (TORQUE SWITCH SET TO APROX. 1.65) i i

1 i

MC1 AMPS L1 CURRENT 100 _

l i

l

~

50 -

l

?

t i

O'_

j i

1

)

i i

4 i

i

-~ --

- --l-

-100 -

i l

i I

5 10 15 20 secs time B430081 DataSet 008 Duration 00:00:21:683 Recorded On 12/29/92 11:04:17

TEST COMPLETE 6.3.3 PRESSURE LOCH TEST TESTn5 a (TORQUE SWITCH SET TO APROX. 1.65) r MP W

TRUE POWER r

80000 -

60000 _

i i

i 40000 _

i 20000 _

........ i..

i 0

t

..... ~

-2QQQQ _

j

-40000 _

i i

~

-60000 -

-80000 _

i i

5 10 15 20 secs time B430081 DataSet 008 Duration 00:00:21:683 Recorded On 12/Z9/92 11:04:17 m

_ - -.. ~

TEST COM LETE 6.3.3 PRESSURE LOCX TEST TEST #5 a (TORQUE SWITCH SET TO APROX. 1.65) 2 1

i MU1 UAC L1 to MEUTRAL UOLTAGE 1

1 i

i 400

~'

4 i

2%

t l

i l

O

-200 i

l

-400 l

i i

5 10 15 20 secs time B430081 DataSet 008 Duration 00:00:21:683 Recorded On 12/29/92 11:04:17

TEST COMPLETE 6.3.3 PRESSURE LOCK TEST TESTm5 a (TORQUE SWITCH SET TO APROX. 1.65)

S3 AMPS CLOSE TORQUE SWITCH 6

j i

i 4_

2_

0 E

i i

g_

-4 _

5 10 15 20 secs tIMC B430081 DataSet 008 Duration 00:00:21:683 Recorded On 12/29/92 11:04:17

T ST C0f1PLETE 6.3.3 PRESSURE LOCE TEST TESTS 5 a (TORQUE SWITCH SET TO APROX. 1.65)

S4 Al1PS CLOSE BY-PASS SWITCH 6

g.

2_

............i............. -

......i....

O i

i i

.i i

i.

i

.--l--

l-------

e

-4 _

.i.......

....i.........

5 10 15 20 secs t1Re B430081 DataSet 008 Duration 00:00:21:683 Recorded On 12/29/92 11:04:17

TEST COMt'LETE 6.3.3 PRESSURE LOCH TEST TEST #5 a (TORQUE SWITCH SET TO APROX. 1.65)

S5 ANPS OPEN BY-PASS SWITCH 6

4 i

4.

..........................,...........i.

0 i

i i

i

i- ---

-i--- -------i--

-4..............i.............i.............i..........

i i

i 5

10 15 20 secs tine B430081 DataSet 008 Duration 00:00:21:683 Recorded On 12/29/92 11:04:17

TEST COMPLETE 6.3.3 PRESSURE LOCK TEST TESTst5 a (TORQUE SWITCH SET TO APROX. 1.65)

TCZ DegF MOU INLET TEMPERATURE g_

i 40 -... '...........

20-.

o...............

O

............i...............i..............!...

-20 i

i

--40 _

...i............ -

i i

-60

.........................i_.............:............:.

5 10 15 20 secs time B430081 DataSet 008 Duration 00:00:21:683 Recorded On 12/29/92 11:04:17

TEST C0f1PLETE 6.3.3 PRESSURE-LOCK TEST TESTS 5 a (TORQUE SWITCH SET TO APROX. 1.75)

THH1 LB STEli THRUST 80

.........~

60000 -

40000 20000 7.

0 3

-2 e.

-fQQQQ

......... i......... i........i....... i................:

i

-60000 _

-80000 i

I e

I E

I I

5 10 15 20 25 30 35 secs 4

time B430081 DataSet 009 Duration 00:00:35:545 Recorded On 12/29/92 11:24:50 O

P L

I

TEST COMPLETE 6.3.3 PRESSURE LOCK TEST TESTt5 a (TORQUE SWITCH SET TO APROX. 1.75)

PS3 PSIG BONNET PRESSURE 1500 -

t 1000

. g.. :............

p i

500 -

0 t

-500 -

..y

-10

........y

""15%..........

..y..

...,........e y....

5 10 15 20 25 30 35 secs tIMC B430081 DataSet 009 Duration 00:00:35:545 Recorded On 12/29/92 11:24:50 P

t 2

r A

TEST COMPLETE 6.3.3 PRESSURE LOCK TEST TESTS 5 a (TORQUE SWITCH SET TO APROX. 1.75) i SPD IN SPRING PACK DISPLACENENT 2!

i 1,{3 _

1

.1 (3.g; _

0

.-0.5

-1

__1.5 1

5 10 15 20 25 30 35 secs tisce-B430081 DataSet 009 Duration 06:00:35:545 Recorded On 12/29/92 11:24:50 i

TEST COMPLETE 6.3.3 PRESSURE LOCR TEST TESTit5 a (TORQUE SWITCH SET TO APROX. 1.75)

S2 AMPS OPEN TORQUE SWITCH l

6 4

..}..

i i

i i.

.i t

2_

.} -....-.......

t l

l M

l l

1 c

_{

-4 _............................:........

y i

k 5

10 15 20 25 30 35 secs time t

B430081 DataSet 009 Duration 00:00:35:545 Recorded On 12/29/92 11:24:50 i

f

(

i:

f TEST C0t1PLETE 6.3.3 PRESSURE LOCK TEST TESTN5 a (TORQUE SWITCH SET TO APROX. 1.75)

PS2 PSIG DOWNSTREAN PRESSURE 1500 1

1000 500

-500

-1000

-1500 i

i i

5 10 15 20 25 30 35 secs tIMO R430081 DataSet 009 Duration 00:00:35:545 Recorded On 12/29/92 11:24:50 h

6

l t

I l

L TEST COMPLETE 6.3.3 PRESSURE LOCK TEST TEST #5 a (TORQUE SWITCH SET TO APROX. 1.75) l t

}

MC1 AMPS L1 CURRENT r

f i

100 i

l 1

l 50 -

t t

s s!

f g

)

i f

5 10 15 20 25 30 35 secs i

time B430081 DataSet 009 Duration 00:00:35:545 Recorded On 12/Z9/92 11:24:50 i

l 1

l t

I

h 1

TEST COMPLETE 6.3.3 PHESSURE LOCK TEST TESTm5 a (TORQUE SWITCH SET TO APROX. 1.75) b l'c Si AMPS OPEN LIMIT SWITCH 6

=

f w

i.

i l

g-i l

l l

N 4

{

..s

.....i...........

....i....

-4.

l l

a i

i e

i i

5 10 15 20 25 30 35 secs time l

B430081 DataSet 009 Duration 00:00:35:545 Recorded On 12/29/92 11:24:50 i

l 1

I

TEST COMPLETE 6.3.3 PRESSURE LOCK TEST TESTS 5 a (TORQUE SWITCH SET TO APROX. 1.75)

SS AMPS OPEN BY-PASS SWITCH 6

1 4_

2..................:...........

0

., }

..y......................

-4 _

5 10 15 20 25 30 35 secs time B430081 DataSet 009 Duration 00:00:35:545 Recorded On 12/29/92 11:24:50

TEST C0ftPLETE 6.3.3 PRESSURE LOCK TEST TESTS 5 a-(TORQUE SWITCH SET TO APROX. 1.75)

S4 At1PS CLOSE BY-PASS SWITCH 6

4 2.

0 1

......y.

_.}P

........y.................

6

__ A T -

.L....

5 10 15 20 25 30 35 secs time B430081 DataSet 009 Duration 00:00:35:545 Recorded On 12/29/92 11:24:50

TEST C011PLETE 6.3.3 PRESSURE LOCK TEST TESTS 5 a (TORQUE SWITCH SET TO APROX. 1.75)

S3 Af1PS CLOSE TORQUE SWITCH 6

L i,

4_

s.

2_

,........{.

0 t

L

--4 t

5 10 15 20 25 30 35 secs time B430081 DatrSet 009 Duration 00:00:35:545 Recorded On 12/29/92 11:24:50 h

r P

I i

I TEST COMPLETE 6.3.3 PHESSURE LOCK TEST TESTit5 a (TORQUE SWITCH SET TO APROX. 1.75) i l

MU1 UAC L1 to MEUTRAL UOLTAGE i

I i

i i

I

~

i i

i

)

0 E

i

-200

.i........i..........i.....

-400 _

.~.......................

i l

.i

~

5 10 15 20 25 30 35 secs time B430081 DataSet 009 Duration 00:00:35:545 Recorded On 12/29/92 11:24:50 t

!a

TEST C0l1PLETE 6.3.3 PRESSURE LOCK TEST TESTS 5 a (TORQUE SWITCH SET TO APROX. 1.75)

PS1 PSIG UPSTREAli PRESSURE

.1 4M.

........L.

ZM.

-200 -

-400 _

I I

B I

I I

I 5

10 15 20 25 30 35 secs time B430081 DataSet 009 Duration 00:00:35:545 Recorded On 12/29/92 11:24:50 i

t T"ST COMPLETE 6.3.3 PRESSURE LOCK TEST TESTRS a (TORQUE SWITCH SET TO APROX. 1.75)

I TCZ DegF MOU IMLET TEMPERATURE

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GNRO-97/00056 i

i APPENDIX 2 -

i DRAFTTEST PLAN FOR PRESSURE LOCKING AND THERMAL BINDING.

TESTING OF 2 GATE VALVES FOR ENTERGY OPERATIONS j

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Draft Test Plan for Pressure Locking and Thermal Binding Testing of 2 Gate Valves for Entergy Operations 5/13/97 1.0 Test Specimen The valves to be tested are as follows.

a) One 14",900# Powell flex wedge gate velve with an SB-3 actuator. This valve has flanges welded to each end and will be provided with associated blind flanges and bolting. Wyle Labs will provide gaskets.

b) One 3",900# Velan flex wedge gate valve with an SMB-00 actuator. This valve has flanges welded to each end to accept blind fl mges. Wyle Labs will provide the required blind flanges, gaskets, and bolting.

2.0 Valve Diagnostic Equipment a) Strain gages shall be mounted on/in the valve stems. These gages shall be compatible with the Wyle Megadat data collection system.

3.0 Instrumentation a) 'Ihree pressure transmitters shall be installed to monitor pressure on the upstream / downstream side of the disc and within the confines of the bonnet. The pressure measuring devices shall be capable of accurately measuring pressure w thin 0.5% in the range of 0 - 1500 psig. Bonnet pressure may be measured off the packing leakoffline as long as packing below the lantern ring is replaced with a material that does not create a pressure drop between the bonnet and the pressure transmitter. If this is not possible, then tapping of the valve may be done with the prior approval of the Entergy Operations contract / test coordinator. The upstream / downstream pressure taps shall be located in the valve blind flanges.

b) A temperature sensing device capable of measuring the valve fluid temperature in the vicinity of the bonnet pressure monitoring device and the ambient room temperature shall be available.

4.0 Pretest Work a) Entergy will obtain critical valve dimensions.

b) ' Entergy will supply torque switch settings and weak link analysis for the valves.

c) Entergy will supply the friction factor calculation method.

d) Wyle will perform spring pack displacement calibration.

e) Wyle will receive and uncrate the valves and the motor / actuators.

i l

f) Wyle will inspect all components for possible damage from shipping. Any damage shall be reported to the Entergy Operations contract / test coordinator for disposition.

l g) Wyle will purchase and install 3",900# blind flanges, gaskets, and bolting on the 3" Velan valve.

Wyle will purchase gaskets for the 14",900# Powell valve and install blind flanges, gaskets, and l

bolting.

I h) Wyle will designate a downstream and upstream reference for each valve and install pressure taps on l

the valves.

i) Wyle will assemble and connect protective torque switch and thermal overload control circuits typical for a Limitorque actuator. The torque switches shall not be bypassed during the open stroke.

j) Wyle will set up valve diagnostic equipment and instrument the valves per section 3.0. All instruments shall have documented calibration such that the following traces and data points are available for the following test sequences:

Test Point Matrix 1

Combined Upstream Bonnet Bypass EET Trace Parameter Test Test Test Test or Data Point X

X X

1 Upstream Pressure X

2 Downstream Pressure X

X X

X.

3 Bonnet Pressure X

X X

X 4

Motor Current X

X X

X 5

Spring Pack Displacement X

X X

X 6

Stem Torque X

X X

X 7

Stem Thrust X

X X

X 8

Open Torque Switches X

9 Close Torque Switches X

X X

10' Valve Temperature X

X X

11*

Room Temperature

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X X

12' tsus Voltage (Phase to Phase) 13*

Friction Factor Validation

Indicates data point; no trace required Monitoring equipment will be capable of producing a continuous smooth time trace over every stroke for the above parameters. A common time scale will be utili:edfor the various requiredfor each test sequence.

Open strokes may be terminated after the valve is 10% open.

l k) Wyle will adjust torque switch settings to limit stem thrust and torque to within the maximum limits provided by the Entergy Operations contract / test coordinator.

1) Wyle will perform a pretest LLRT. The test will be performed separately on both the upstream and downstream side of the disc for each valve. Test pressure shall be 20% of the peak test pressure. The Entergy test coordinator shall be present for the test and will determine further actions ifleakage is j

large enough to preclude performance of the test sequences.

i

5.0 Test Fluid The test fluid will be ordinary tap water charged by hydro pumps. Alternate charging methods may be acceptable if pre-approved by the Entergy test coordinator.

6.0 Test Sequence 6.1 Ambient Friction Factor Test The purpose of this test sequence is to establish a valve disk to seat friction factor at ambient temperaturefor the 3 " and 14 " valves.

a) The valve shall be filled with ambient temperature test fluid and vented such that pressure is zero (0) psig at all locations. The valve / fluid temperature shall be cllowed to stabilize for 15 minutes. The valve and ambient room temperatures shall then be measured and recorded. A contact probe may be used for obtaining the valve temperature.

b) The valve shall be stroked closed and open a minimum of 20 to a maximum of 50 strokes. If the change in friction factor between tests drops to less than 1% this test sequence may be terminated. The friction factor shall be calculated using equations provided by Entergy Operations. This test shall be witnessed by the Entergy test coordinator or designee.

c) Traces / data points required are numbers 4,5,6,7,8,9,10,11 and 12.

6.2 liigh Temperature Friction Factor Test Thepurpose ofthis test sequence is to establish a valve disk to seatfrictionfactorfor the 3 " valve at an elevated temperature.

a) The valve shall befilled with ambient temperature testfluid and vented such that pressure is zero (0) psig at alllocations. The valve shall be wrapped with heat blankets and the temperature rise will commence with the vents closed and the valve in the closedposition.

A contact probe may be usedfor obtaining the valve temperature.

b) Pressure shall be monitored during the rise and will be limited to no more than the maximum testpressure supplied by Entergy Operations. Pressure will be controled manually with the vent valves in each cavity. Safety reliefvalves will be installed on the vent lines with a reliefsetting equal to 1.1 times the max testpressure. Temperature will be limitedto 50 'F below the boilingpointfor water at the maximum test pressure.

c) The valve shall be stroked closed and open a minimum of20 to a maximum of50 strokes.

Ifthe change infrictionfactor between tests drops to less than 1% this test sequence may be terminated andpressure relieved Thefrictionfactor shall be calculated using equations provided by Entergy Operations. This test shall be witnessed by the Entergy test coordinator or designee.

I j

d) Traces /datapoints required a e numbers 4.5,6,7,8,9,10,11 and 12. '

6.3 Bypass Leakage Test d

a) The purpose of this test sequence is to determine the flexibility of the disk / seat structural j

system and will be performed as follows.

l b) 'Ihe valve shall be filled with ambient temperature test fluid and vented such that pressure is zero (0) psig at all locations. The valve / fir id temperature shall be allowed to i

stabilize for 15 minutes. The valve and ambient root;. temperatures shall then be measured and recorded. A contact probe may be used for obtaining the valve j

temperature.

c) Close the valve and ramp up fluid pressure in the upstream side of the valve at a rate not j

to exceed 240 psig/ min. The pressure shall in no circumstance exceed the maximum working pressure of the valve at the fluid temperature. Pressure traces shall be recorded I

j for the entire event.

1 i

d) The pressure rise test shall be terminated after the bonnet pressure rate ofincrease tracks the upstream rate ofincrease. This test shall be witnessed by the Entergy test coordinator or designee.

e) Depressurize the valve for the next test sequence.

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f) Traces / data points required are numbers 1,3,10 and 11 6.4 Bonnet Test The purpose of this test sequence is to determine the maximum open thrust required for the

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valve given a known seating thrust and internal bonnet pressure.

a) The valve shall be filled with ambient temperature test fluid and vented such that l

pressure is zero (0) psig at all locatic ts. The valve / fluid temperature shall be allowed to stabilize for 15 minutes. The valve and ambient room temperatures shall then be measured and recorded.' A contact probe may be used for obtaining the valve temperature. Test conditions shall be controlled such that no appreciable change in valve or ambient temperature occurs during the test sequence, b) The bonnet will be pressurized in three stages during this test. The first pressurization will begin at 33.3% of the maximum bonnet pressure specified for the test. The second and third tests will increase the pressure in 33.3% increments. Up&-- M

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the valve closed pressure rise willfirst be attemptedfrom the upstream side allowing pressurefrom the upstream cavity to unseat the disk andpressurize the bonnet to the specifiedpressure. The upstream cavity will then be depressuri:edto Opsig. Ifthe specifiedpressure cannot be reached in this manner, additionalpressure will be added directly through the bonnet vent. The actual method used will be recorded in the test report.

c) Traces / data points required for this test sequence are 3,4,5,6,7,8,10,11 and 12. The maximum stem thrust on the open stroke and the previous close stroke shall also be recorded.

d) Afk: each open stroke the valve shall be depressurized to O psig, stroked closed, and then repressurized to the next test pressure. This test shall be witnessed by the Entergy test coordinator or designee, e) The bonnet test shall be followed by five close-to-open strokes as specified in section 6.1. Friction factors shall be calculated and recorded.

6.5 Upstream pressure Test The purpose of this test sequence is to determine the combined effects of upstream pressure and pressure trapped in the bonnet. Traces / data points required for this test sequence are 1,3,4,5,6,7,8,10,11 and 12.

a) The valve shal' be filled with ambient temperature test fluid and vented such that pressure is zero (0) psig at all locations. The valve / fluid temperature shall be allowed to stabilize for 15 minutes. The valve and ambient room temperatures shall then be measured and recorded. A contact probe may be used for obtaining the valve temperature.

b) Three test sequences shall be run. (See Figure 1) The bonnet shall be pressurized in order to the (low), (medium) and (high) specified test pressures. The downstream side shall be maintained at atmospheric pressure throughout the test.

Upstream Pressure Test Sequences i

Donnet Pressure 20% Increments IDgh E E E

Med High = 100.0% peak pressure Mediurn = 66.7% peak pressure Low = 333% peak pressure Low E8##"'"

Low Med liigh i

Figure 1 I

c) For each series of bonnet pressures, the up stream side cf the disk shall be pressurized in 20% increments until it is equal to the bonnet pressure. At each 20% increment the valve shall be stroked open. Required thrust and the last closing thrust before the open stroke shall be recorded.

l

i l

d) Following each open stroke, the valve will be depressurized, stroked closed, and j

repressurized to the next increment. This test shall be witnessed by the Entergy test i

coordinator or designee. The Entergy test coordinator may decrease the number of required test points for the medium and high bonnet pressures if a consistent, repetitive trend is established.

e) Each of the three test sequences shall be followed by five close-to-open strokes as i

specified in section 6.1. Friction factors shall be calculated and recorded.

l 6.6 Combined Test i

i ne purpose of this test sequence is to determine the combined effects of upstream / downstream DP and pressure trapped in the bonnet. Traces / data points required for this test sequence are 1,2,3,4,5,6,7,8,10,11 and 12.

a) The valve shall be filled with ambient temperature test finid and vented such that pressure is zero (0) psig at all locations. The valve / fluid temperature shall be allowed to stabilize for 15 minutes. The valve and ambient room temperatures shall then be i

measured and recorded. A contact probe may be used for obtaining the valve temperature.

b) The bonnet shall be pressurized to the (high) specified pressure.

c) The downstream side of the disk shall be pressurized at 20% of the bonnet pressure. The upstream side of the disk shall be pressured at 20%,60% and 100% increments. At each increment, the valve shall be stroked open. Required thrust and the last closing thrust before the open stroke shall be recorded.

d) Following each open stroke, the valve will be depressurized, stroked closed, and repressurized to the next increment. This test shall be witnessed by the Entergy test coordinator. The Entergy test coordinator may decrease the number of required test points if a consistent, repetitive trend is established.

e) The first combined test series described in (c) and (d) above shall be followed by five close-to-open strokes as specified in section 6.1. Friction factors shall be calculated and recorded.

f) Afler the completion of the (c/d) test above, the downstream side of the disk shall then be pressurized at 40% of the bonnet pressure. The upstream side of the disk shall be pressured at 40%,60% and 100% increments until equal to bonnet pressure. At each increment, the valve shall be stroked open. Required thrust s.J th e last closing thrust before the open stroke shall be recorded.

g) Following each open stroke, the valve will be depressurized, stroked closed, and repressurized to the next increment. His test shall be witnessed by the Entergy test coordinator. He Entergy test coordinator may decrease the number of required test points if a consistent, repetitive trend is established.

h) The second combined test series described in (f) and (g) above shall be followed by five close-to-open strokes as specified in section 6.1. Friction factors shall be calculated and recorded.

7.0 Test Report Content The test report prepared by Wyle shall contain the following information a) A copy of the test procedure.

b) Description of the test set-up including sketches of the instrumentation points and a description of the test specimen.

c) Results and conclusions including a comparison of predicted vs. actual required stem thrust for the specified conditions. The associated inaccuracy of each test shall be reported.

d) Anomalies and disposition.

e) Copies of traces, calculations, and other plots generated in support of the test. The various traces for each test sequence will utilize a common time scale.

f) Pre and post test calibration data and due dates for all test equipment used.

I L

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i i-to:

l' GNRO-97/00056 N

APPENDIX 3 1

4 1

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GNRO-97/00056 APPENDIX 4 PRESSURE LOCKING THRUST AND ACTUATOR CAPABILITY CALCULATION RESULTS

SUMMARY

i kL

l FLEX DISC VALVE ANALYSIS FOR VARIOUS VALVES CALCULATION RESULTS

SUMMARY

The Total Required Thrust for opening any valve, under stated pressure locking conditions, is dependent on the final wedging force from the previous closing j

cycle. For a given torque switch setting, the wedging force from valve closure can i

vary because the inertia overshoot is affected by the magnitude of the differential pressure across the disc. Typically, the highest wedging force would be introduced when the valve is closed without differential pressure. This calculation conservatively quantifies the unwedging force based upon a calculated closing thrust. Regardless of the approach used, the dependence of the opening thrust during unwedging on the wedging force from the previous closing cycle must be quantified to ensure proper operation of the valve. Furthermore, the unwedging force is affected by the pressure loading of the valve discs. As the differential pressure across a disc decreases so does the unwedging force.

The Total Required Thrust for opening these valves, under the stated pressure locking conditions,is as follows:

i Valve Load Case Total Required Limiting high/ internal / low Thrust Component (psig)

(Ibf)

Allowable Thrust (lbf) 1E12-F028A 0/242/0 26,390 34,459

)

1E12-F028B 0/240.4/0 39,299 42,872 IE12-F064C 3/344/0 2,374 7,698 IP41-F064A 0/45/0 1,843 5,818 IP41-F064B 0/45/0 2,518 6,545 IP41-F081 A 0/45/0 2,128 5,818 IP41-F081B 0/45/0 3,232 6,545 1P41-F237 0/45/0 3,570 5,727 1P41-F238 0/45/0-3,459 5,727

ML20148R385

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ML20148R385

Text

Subject:

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Response

Response

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