ML17286A655

Responds to 901025 Generic Ltr 89-10 Suppl 3 Re Consideration of Results of NRC Sponsored Tests of Motor Operated Valves.Rwcu Valve Not Tested & No Deficiencies Identified in RCIC Valves

ML17286A655
Person / Time
Site:	Columbia
Issue date:	03/12/1991
From:	Sorensen G WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
GL-89-10, GO2-91-050, GO2-91-50, TAC-75738, TAC-77801, NUDOCS 9103190437
Download: ML17286A655 (11)

Text

ACCELERATED D> TRIBUTION DEMONS TION SYSTEM '"

REGULATORY INFORMATION DISTRIBUTION SYSTEM (RXDS)

ACCESSION NBR:9103190437 DOC.DATE: 91/03/12 NOTARIZED: YES DOCKET FACIL:50-397 WPPSS Nuclear Project, Unit 2, Washington Public Powe 05000397 AUTH. NAME AUTHOR AFFILIATION SORSENSEN,G.C. Washington Public Power Supply System RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk) 'R

SUBJECT:

Responds to 901025 Generic Ltr 89-10 Suppl 3 re consideration of results of NRC sponsored tests of motor operated valves.RWCU valve not tested &,no deficiencies D identified in RCXC valves.

DISTRIBUTION CODE: A064D TITLE: Response COPIES RECEIVED:LTR to Generic Ltr 89-10, J ENCL "Safety-Related I

MOV SIZE:

Testing 6 Surveill S

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NOTES RECXPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL D PD5 LA 1 0 PD5 PD 1 1 ENG, P. L. 1 1 D INTERNAL: ACRS 1 1 BAER, B RES 1 1 NRR/DET~ 7E 1 1 NRR/LPEB/BC 1 1 EG- PTE& 1 1 RES/DSIR/EIB/B 1 1 EXTERNAL: NRC PDR NSIC D

'D D

NOTE TO ALL "RIDS" RECIPIENTS:,

PLEASE HELP US TO REDUCE WASTE! CONTACT THE DOCUMENT CONTROL DESK, ROOM P 1-37 (EXT. 20079) TO ELIMINATEYOUR NAME FROM DISTRIBUTION LISTS FOR DOCUMENTS YOU DON'T NEED!

TOTAL NUMBER OF COPIES REQUIRED: LTTR 11 ENCL 10

WASHINGTON PUBLIC POWER SUPPLY SYSTEM P.O. Box 96B ~ 3000 George Washington Way ~ Richland, Washington 99352 March 12, 1991 G02-91"050 Docket No. 50-397 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D.C. 20555 Gentlemen:

Subject:

NUCLEAR PLANT NO. 2, OPERATING LICENSE NPF-21 RESPONSE TO GENERIC LETlER 89-10, SUPPLEMENT 3 (TAC NOS. 75738 AND 77801)

Reference:

1. NRC Generic Letter 89-10, Supplement 3, "Consideration of the Results of NRC Sponsored Tests of Motor-Operated Valves", dated October 25, 1990

2. EPRI Report NP-7065, "Review of NRC/INEL Gate Valve Test Program", Prepublication Copy date January, 1991

3. Letter, G02-90-204, GC Sorensen (SS) to NRC, same subject, dated December 12, 1990 Generic Letter 89-10, Supplement 3 requires that BWR licensees provide a written response to Reporting Requirement number two within 120 days of their receipt of the letter. The Supply System received the reference letter November 12, 1990.

The purpose of this letter is to provide such response.

The 120 day reporting requirement requested:

a.) Criteria, reflecting operating experience and the latest test data, that were applied in determining whether deficiencies exist in the specified HPCI, RWCU and RCIC motor-operated valves and in any MOV's considered to be more safety significant; b.) The identification of any MOV's found to have deficiencies; and c.) A schedule for any necessary corrective action.

The 30 day response previously submitted (Reference 3) indicated that no MOV's have been identified with greater safety significance than those previously identified in IE Bulletin 85-03. Containment isolation valves in the steam supply lines of the High Pressure Coolant Injection (HPCI) system are not applicable to WNP-2 since we do not have a HPCI turbine. Following is the response for the RWCU and RCIC valves.

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Page Two

)ESPONSE TO GENERIC LETTER 89-10, SUPPLEMENT 3 The Supply System is participating in the EPRI HOV Performance Prediction Program and other industry groups. Further review of these specific RWCU and RCIC valves will be completed as industry data becomes available.

RWCU Valves A detailed comparison of the RWCU isolation valves to the INEL test valves has been made in Table 1. The RWCU isolation valves at WNP-2 are deemed to be very similar to INEL valves "B" and "2" with the exception of motor size and stem thread lead. The motors are rated at 40 foot pounds starting torque versus 25 foot pounds for the INEL operators providing 60% to 90% higher motor pullout torque capability. The larger stem thread lead for the WNP-2 valves results in a higher speed valve with less thrust for a given motor size. However, the thrust is compensated for by the larger motor size for the WNP-2 valves.

A review of the first blowdown isolation test for the two INEL valves indicates a maximum apparent disk factor of 0.35 for flow isolation. This valve disk factor will be used to determine the thrust setpoints for the WNP-2 RWCU valves using the standard industry equations. It is also noted that the thrust capability of the RWCU operators with the torque switch bypassed exceeds the required closing thrust provided in Information Notice 90-40.

The RWCU valves have not yet been diagnostically tested due to inaccessibility during plant operation. The valves are currently scheduled to be tested during the 1991 Spring Refueling Outage. The identification of any deficiencies and a schedule for any potential corrective actions will be reported within 30 days following the completion of that outage if any deficiencies are identified.

RCIC Valves A detailed comparison of the RCIC inboard isolation valve at WNP-2, RCIC-V-63, to the INEL test valves has been made in Table 2. This valve is deemed to be similar to INEL valve "6" with the exception of operator size, unit ratio, stem thread lead, and motor speed.

After review of Reference 2, it appears all blowdown closure strokes for the test valve were performed with pre-existing damage to the body guide rails and the direct applicability of the apparent disk factor to the valve at WNP-2 is questionable.

RCIC-V-63 has been diagnostically tested as part of IE Bulletin 85-03. The torque switch has been verified to be bypassed for approximately 98% of valve stroke in the close direction. The thrust capability of the operator with the torque switch bypassed has been evaluated in response to Information Notice 90-

40. The thrust capability greatly exceeds the required thrust reported in Table 1 of Information Notice 90-40 thus providing a high degree of assurance of valve isolation.

The outboard isolation valve at WNP-2, RCIC-V-8, is a 4 inch Velan flexible wedge gate valve., No valves of this size were tested in the blowdown test research program, therefore a comparison of this valve to any test valve data is not made.

Page Three e

RESPONSE TO GENERIC LETTER 89-10, SUPPLEMENT 3 RCIC-V-8 has been diagnostically tested as part of IE Bulletin 85-03. The thrust setpoint for RCIC-V-8 has been established using the standard industry equations with a valve factor of 0.3. The motor operator was set up and verified to meet the required thrust setpoint during diagnostic testing. In addition, the torque switch has been verified to be bypassed for approximately 98% of valve stroke in the close direction. This will allow full actuator stall torque capability during the bypass period thus maximizing the probability of valve isolation.

No deficiencies were identified for RCIC-V-63 or RCIC-V-8, and therefore no corrective actions are necessary.

As discussed above, we will inform the NRC of any deficiencies identified during diagnostic testing of the RWCU valves. This completes the Supply System's response to Generic Letter 89-10, Supplement 3.

Very truly yours, G. C. Sorensen, Manager Regulatory Programs HLA/MRG/bk Attachments cc: JB Hartin - NRC RV NS Reynolds - Winston & Strawn PL Eng - NRC DL Williams - BPA/399 NRC Site Inspector - 901A

STATE OF WASHINGTON)

Subject:

GL 89-10, Sup lement 3

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COUNTY OF BENTON I. A. G. HOSLER, being duly sworn, subscribe to and say that I am the Manager, WNP-2 Licensing, for the WASHINGTON PUBLIC POWER SUPPLY SYSTEM, the applicant herein; that I have the full authority to execute this oath; that I have reviewed the foregoing; and that to the best of my knowledge, information, and belief the statements made in it are true.

DATE 1991 A. G. Hosier, Manager WNP-2 Licensing On this date personally appeared before me A. G. HOSLER, to me known to be the individual who executed the foregoing instrument, and acknowledged that he signed the same as his free act and deed for the uses and purposes herein mention.ed GIVEN under my hand and seal this ~day of 1991.

No ry Public in and for the STATE OF WASHINGTON Residing at My Commission Expires

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Table 1: RWCU Valve Comparison INEL Valve WNP-2 Valve WNP-2 Valve "B" and "2" RWCU-V-1 RWCU-V4 Item (Inboard Isolation) (Outboard Isolation)

Manufacturer Velan Veian Veian Drawin Number P2-70916-S01 P2-3311-N4 P24311-N4 Size in.

ANSI Class (lbs.) 900 900 900 Orifice Diameter fn.) 5.18 5.19 5.19 Disk Base Material A-105 SA-216 WCB SA-105 Disk Seat Material Stellite 6 Stellite 6 Stellite 6 Disk Guide Material Stellite 6 (B), A-1 05 (2) Stellite 6 or SA-105 Stellite 6 or SA-105 Body Guide Material A46 SA46 SA46 Seat Ring Base Material A-216 WCB SA-216 WCB or SA-105 SA-105 Seat Rin Material Stellite 6 Stellite 6 Stellite 6 Stroke Length (in.) 5.75 5.75 5.75 Stem Diameter (in.) 1.75 1.75 1.75 Thread T e Acme Acme Acme Thread Pitch (in.) 1/4 1/4 1/4 Thread Lead (in./rev.) 1/4 1/2 1/2 Operator Model SMB4 SMB4 SMB4 Unit Ratio 34.9 34.96 41.33 S rin PackNo. 0501-184 604004017-1 604004017-1 Motor Pullout Torque

@ Rated Voltage 314 ft-Ibs 503 ft-Ibs 595 ft-Ibs

@De raded Volta e 201 ft-Ibs 322 ft-Ibs 476 ft-Ibs MotorS eed 1800r m 1800r m 1900 r m Motor Voltage 460 VAC 460 VAC 240 VDC Motor Starting Torque 25 ft-Ibs 40 ft-Ibs 40 ft-Ibs 0 erator Rated Tor ue 500 ft-Ibs 500 ft-Ibs 500 ft-Ibs 0 erator Rated Thrust 24,000 Ibs 24,000 lbs 24,000 Ibs Valve Rated Thrust Not Available 25,516 Ibs 25,516 Ibs

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Table 2: RCIC Valve Comparison INEL Valve WNP-2 Valve "6" RCIC-V-63 Item (Inboard Isolation)

Manufacturer Velan Velan Drawin Number P2-72916-S01 P2-3311-N-1 4 Size ln. 10 10 ANSI Class (lbs.) 600 900 Orifice Diameter (in.) 7.87 Disk Base Material A-105 SA-105 Disk Seat Material Stelllte 6 Stellite 6 Disk Guide Material A-105 Stellite 6 or SA-105 Body Guide Material A46 SA46 Seat Ring Base Material A-105 SA-216 WCB or SA-105 Seat Rin Material Stelllte 6 Stellite 6 Stroke Length (ln.) 8.75 8.5 Stem Diameter (in.) 2.5 2.5 Thread T e Acme Acme Thread Pitch (in.) 1/3 1/3 Thread Lead (in./rev.) 2/3 1 Operator Model SMB-1 SMB-2 Unit Ratio 56.6 95.58 S rin PackNo. 0701-212 604004071-1 Motor Pullout Torque

@ Rated Voltage 1222 ft-Ibs 1806 ft-Ibs

@De raded Volta e 782 ft-Ibs 1156 ft-Ibs MotorS eed 1800r m 3600r m Motor Voltage 460 VAC 460 VAC Motor Starting Torque 60 ft-Ibs 60 ft-lbs 0 eratorRatedTor ue 850 ft-Ibs 1250 ft-Ibs 0 erator Rated Thrust 45,000 Ibs 70,000 1bs Valve Rated Thrust Not Available 57,782 Ibs

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