ML17362A043

Stations, Units 1 and 2 - Anchor Darling Double Disc Gate Valve Information and Status

ML17362A043
Person / Time
Site:	Millstone, Surry, North Anna
Issue date:	12/18/2017
From:	Mark D. Sartain Dominion Energy Nuclear Connecticut, Virginia Electric & Power Co (VEPCO)
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
17-343A
Download: ML17362A043 (14)

Text

Dominion Energy Services, Inc.

5000 Dominion Boulevard, Glen Allen, VA 23060 December 18, 2017 ~ Dominion Dominion Energy.com P' Energy United States Nuclear Regulatory Commission Serial No.: 17-343A Attention: Document Control Desk NRA/GDM: R1 Washington, D.C. 20555-0001 Docket Nos.: 50-336/423 50-338/339 50-280/281 License Nos.: DPR-65/NPF-49 NPF-4n DPR-32/37 VIRGINIA ELECTRIC AND POWER COMPANY (DOMINION ENERGY VIRGINIA)

DOMINION NUCLEAR CONNECTICUT, INC.

MILLSTONE POWER STATION UNITS 2 AND 3 NORTH ANNA AND SURRY POWER STATIONS UNITS 1 AND 2 ANCHOR DARLING DOUBLE DISC GATE VALVE INFORMATION AND STATUS

References:

1) Letter from Greg Krueger (NEI) to John Lubinski (U.S. Nuclear Regulatory Commission), "Anchor Darling Double Disc Gate Valve Industry Resolution Plan Update (Project 689)," dated August 4, 2017

2) Letter from Joe Pollock (NEI) to Brian Holian (U.S. Nuclear Regulatory Commission), "NSIAC Concurrence on Anchor Darling Double Disc Gate Valve Industry Response Actions (Project 689)," dated October 26,2017

3) BWROG Topical Report TP-16-1-112, Revision 4, "Recommendations to Re*solve Flowserve 10 CFR Part 21 Notification Affecting Anchor Darling Double Disc Gate Valve Wedge Pin Failure" In Reference 1, the Nuclear Energy Institute (NEI) provided the NRC a resolution plan for the U.S. Nuclear Industry to address the known Anchor Darling Double Disk Gate Valve (ADDDGV) issues. Reference 2 indicated each utility would provide a listing of their Anchor Darling valve population with active safety functions along with relevant valve information, including the results of susceptibility evaluations, repair status, and a repair schedule for each susceptible valve not yet repaired. This letter serves to provide this information for Millstone Power Station (MPS) Units 2 and 3, and North Anna and Surry Power Stations (NAPS and SPS, respectively) Units 1 and 2.

The attachments to this letter contain the following information for each ADDDGV:

• Plant Name, Unit, and Valve ID.

• System.

• Valve FunctionaLDescription.

• Valve Size.

Serial No. 17-343A Docket Nos. 50-336/423/338/339/280/281 Page 2 of 3

• Active Safety Function (Open, Close, Both).

• Are multiple design basis post-accident strokes required (Yes/No)?

• Expert Panel Risk Ranking (High, Medium, Low).

• Result of Susceptibility Evaluation (Susceptible or Not Susceptible).

• Is the susceptibility evaluation in general conformance with TP16-1-112R4 (Reference 3)?

• Does the susceptibility evaluation rely on thread friction? If yes, was the COF greater than 0.1 O? For cases where thread-friction was relied upon, information is provided whether the coefficient of friction was above or below 0.1 .

• Was an initial stem-rotation check performed? If yes, include rotation criteria (i.e., S10 degrees or S5 degrees).

• Was the diagnostic test data reviewed for failure precursors described in TP16-1-112R4 (Reference 3)?

• Valve Repair Status (i.e., Repaired or Not Repaired).

• Repair Schedule for Each Susceptible Valve.

Regarding the last bullet, as noted in the attachments, no susceptible valves were identified during our review in addition to those included in our August 31, 2017 letter (ADAMS Accession No. ML17250A157). Consequently, repair schedules for the listed valves are not included.

Should you have any questions or require additional information, please contact Mr. Gary D. Miller at (804) 273-2771.

Respectfully, Mark D. Sartain Vice President - Nuclear Engineering and Fleet Support Virginia Electric and Power Company Dominion Energy Nuclear Connecticut, Inc.

Summary of Regulatory Commitments:

No new regulatory commitments are contained in this letter.

Attachments:

1. Anchor Darling Double Disc Gate Valve Information and Status - Millstone Power Station Units 2 and 3

2. Anchor Darling Double Disc Gate Valve Information and Status - North Anna Power Station Units 1 and 2

3. Anchor Darling Double Disc Gate Valve Information and Status - Surry Power Station Units 1 and 2

Serial No. 17-343A Docket Nos. 50-336/423/338/339/280/281 Page 3 of 3 cc: U.S. Nuclear Regulatory Commission - Region I 2100 Renaissance Blvd, Suite 100 King of Prussia, Pennsylvania 19406 - 2713 U.S. Nuclear Regulatory Commission - Region II Marquis One Tower 245 Peachtree Center Ave., NE Suite 1200 Atlanta, Georgia 30303-1257 NRC Senior Resident Inspector Millstone Power Station NRC Senior Resident Inspector North Anna Power Station NRG Senior Resident Inspector Surry Power Station Mr. R. Guzman NRG Senior Project Manager - Millstone U.S. Nuclear Regulatory Commission One White Flint North Mail Stop 08 C2 11555 Rockville Pike Rockville, Maryland 20852-2738 Mr. J. R. Hall NRC Senior Project Manager - North Anna U.S. Nuclear Regulatory Commission One White Flint North Mail Stop 08 B1A 11555 Rockville Pike Rockville, Maryland 20852-2738 Ms. K. R. Cotton Gross NRG Project Manager - Surry U. S. Nuclear Regulatory Commission One White Flint North Mail Stop 08 G9A 11555 Rockville Pike Rockville, Maryland 20852-2738

Serial No. 17-343A Docket Nos. 50-336/423 ADDDGV Information and Status Attachment 1 ANCHOR DARLING DOUBLE DISC GATE VALVE INFORMATION AND STATUS Dominion Nuclear Connecticut, Inc.

Millstone Power Station Units 2 and 3

Serial No. 17-343A Docket Nos. 50-336/423 ADDDGV Information and Status Attachment 1 Page 1 of 1

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"A" Containment Containment MPS 2 2-CS-4.lA Spray Header Isolation 8 Both Yes High Not Susceptible Yes Yes, >0.10 No Yes Not repaired Spray Valve "B" Containment Containment MPS 2 2-CS-4.lB Spray Header Isolation 8 Both Yes High Not Susceptible Yes Yes, >0.10 No Yes Not repaired Spray Valve Containment RWST Outlet Header MPS 2 2-CS-13.lA 18 Close No Medium Not Susceptible Yes Yes, >0.10 No Yes Not repaired Spray "A" Isolation Valve Containment RWST Outlet Header MPS 2 2-CS-13.lB 18 Close No Medium Not Susceptible Yes Yes, >0.10 No Yes Not repaired Spray "B" Isolation Valve Containment Sump Containment MPS 2 2-CS-16.lA Outlet Header "A" 24 Both Yes High Not Susceptible Yes Yes, <0.10

• No Yes Not repaired Spray Isolation Valve Containment Sump Containment MPS 2 2-CS-16.lB Outlet Header "B" 24 Both Yes High Not Susceptible Yes Yes, <0.10 No Yes Not repaired Spray Isolation Valve (Al Applied Wedge Pin Torque must bound anticipated design basis operating torque requirements and current maximum total torque.

Serial No. 17-343A Docket Nos. 50-338/339 ADDDGV Information and Status Attachment 2 ANCHOR DARLING DOUBLE DISC GATE VALVE INFORMATION AND STATUS Virginia Electric and Power Company (Dominion Energy Virginia)

North Anna Power Station Units 1 and 2

Serial No. 17-343A Docket Nos. 50-338/339 ADDDGV Information and Status Attachment 2 Page 1 of 2 Residual Heat 1-RH-MOV- Residual Heat NAPS Removal to "B" RCS 10X8X10 Open No Medium Not Susceptible Yes Yes, >0.10 No Yes Not repaired 1720A Removal Loop Residual Heat 1-RH-MOV- Residual Heat NAPS Removal to "C" RCS 10X8X10 Open No Medium Not Susceptible Yes Yes, >0.10 No Yes Not repaired 1720B Removal Loop Low Head Safety 1-SI-MOV- Safety NAPS Injection Hot Leg 10X8X10 Both Yes Low Not Susceptible Yes Yes, >0.10 No Yes Not repaired 1890A Injection

.Injection Valve Low Head Safety 1-SI-MOV- Safety NAPS 1 Injection Hot Leg 10X8X10 Both Yes Low Not Susceptible Yes Yes, >0.10 No Yes Not repaired 1890B Injection Injection Valve Low Head Safety 1-SI-MOV- Safety NAPS Injection Cold Leg 10X8X10 Both Yes Low Not Susceptible Yes Yes, >0.10 No Yes Not repaired 1890C Injection Injection Valve Low Head Safety 1-SI-MOV- Safety NAPS Injection Cold Leg 10X8X10 Both Yes Low Not Susceptible Yes Yes, >0.10 No Yes Not repaired 1890D Injection Injection Valve Residual Heat 2-RH-MOV- Residual Heat NAPS 2 Removal to "B" RCS 10X8X10 Open No Medium Not Susceptible Yes Yes, >0.10 Yes,55 deg. Yes Not repaired 2720A Removal Loop

Serial No. 17-343A Docket Nos. 50-338/339 ADDDGV Information and Status Attachment 2 Page 2 of 2 Residual Heat 2-RH-MOV- Residual Heat NAPS 2 Removal to "C" RCS 10X8Xl0 Open No Medium Not Susceptible<2J Yes Yes, >0.10 Yes, .:,;5 deg. Yes Not repaired 2720B Removal Loop Low Head Safety 2-SI-MOV- Safety Repaired(!)

NAPS 2 Injection Hot Leg 10X8X10 Both Yes Low Not Susceptible Yes Yes, >0.10 Yes, .:,;5 deg. Yes 2890A Injection Injection Valve Low Head Safety 2-SI-MOV- Safety NAPS 2 Injection Hot Leg 10X8X10 Both Yes Low Not Susceptible Yes Yes, >0.10 Yes, .:,;5 deg. Yes Not repaired 2890B Injection Injection Valve Low Head Safety 2-SI-MOV- Safety NAPS 2 Injection Cold Leg 10X8X10 Both Yes Low Not Susceptible Yes Yes, >0.10 Yes, .:,;5 deg. Yes Not repaired 2890C Injection Injection Valve Low Head Safety 2-SI-MOV- Safety NAPS 2 Injection Cold Leg 10X8X10 Both Yes Low Not Susceptible Yes Yes, >0.10 Yes,.:,;5 deg. Yes Not repaired 2890D Injection Injection Valve Applied Wedge Pin Torque must bound anticipated design basis operating torque requirements and current maximum total torque.

(1) The repair of this MOV included upgrading the pin material to Inconel 718 and torquing the stem/wedge connection to a satisfactory value to support an anticipated design basis operating torque.

(2) This valve was considered susceptible in the August 31, 2017 response letter. Re-evaluation to the BWROG guidance indicates this valve is not susceptible, but the commitment to repair is not being changed.

Serial No. 17-343A Docket Nos. 50-280/281 ADDDGV Information and Status Attachment 3 ANCHOR DARLING DOUBLE DISC GATE VALVE INFORMATION AND STATUS Virginia Electric and Power Company (Dominion Energy Virginia)

Surry Power Station Units 1 and 2 J

Serial No. 17-343A Docket Nos. 50-280/281 ADDDGV Information and Status Attachment 3 Page 1 of 5

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01-CH-MOV- Main Charging SPS Charging 3 Close No Low Not Susceptible Yes Yes, >0.10 No Yes Not repaired 1289A Header Isolation 01-CH-MOV- Main Charging SPS Charging 3 Close No Low Not Susceptible Yes Yes, >0.10 No Yes Not repaired 1289B Header Isolation Residual Heat Removal Outlet 01-RH-MOV- Residual Heat SPS Isolation to 10X8Xl0 Open No Medium Not Susceptible Yes Yes, >0.10 No Yes Not repaired 1720A Removal Accumulator Discharge Line Residual Heat Removal Outlet 01-RH-MOV- Residual Heat SPS 1 Isolation to 10X8X10 Open No Medium Not Susceptible Yes Yes, >0.10 No Yes Not repaired 1720B Removal Accumulator Discharge Line Low Head Safety 01-SI-MOV- Safety Injection Pump Cold SPS 1 10 Both Yes Low Not Susceptible Yes No No Yes Not repaired 1864A Injection Leg Discharge Stop Valve Low Head Safety 01-SI-MOV- Safety Injection Pump Cold SPS 10 Both Yes Low Not Susceptible Yes Yes, >0.10 No Yes Not repaired 1864B Injection Leg Discharge Stop Valve

Serial No. 17-343A Docket Nos. 50-280/281 ADDDGV Information and Status Attachment 3 Page 2 of 5 High Head Safety 01-SI-MOV- Safety Injection to Reactor SPS 1867C

• Coolant System 3 Both Yes High Not Susceptible Yes No No Yes Not repaired Injection (RCS) Cold Legs High Head Safety 01-SI-MOV- Safety SPS Injection to RCS 3 Both Yes High Not Susceptible Yes Yes, >0.10 No Yes Not repaired 1867D Injection Cold Legs High Head Safety 01-SI-MOV- Safety Injection from SPS 1 Charging Header to 3 Both Yes Low Not Susceptible Yes Yes, >0.10 No Yes Not repaired 1869A Injection RCS Hot Legs Low Head Safety 01-SI-MOV- Safety Injection Pump Hot SPS 1 10X8X10 Both Yes Low Not Susceptible Yes Yes, >0.10 No Yes Not repaired 1890A Injection Leg Discharge Stop Valve Low Head Safety 01-SI-MOV- Safety Injection Pump Hot SPS 10X8X10 Both Yes Low Not Susceptible Yes Yes, >0.10 No Yes Not repaired 1890B Injection Leg Discharge Stop Valve Low Head Safety 01-SI-MOV- Safety Injection Pump Hot SPS 10X8X10 Both Yes Low Not Susceptible Yes Yes, >0.10 No Yes Not repaired 1890C Injection Leg Discharge Stop Valve

Serial No. 17-343A Docket Nos. 50-280/281 ADDDGV Information and Status Attachment 3 Page 3 of 5

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02-CH-MOV- Charging Pump SPS 2 Charging 8 Both Yes High Not Susceptible Yes Yes, >0.10 No Yes Not repaired 2115B Supply from RWST 02-CH-MOV- Charging Pump SPS 2 Charging 8 Both Yes High Not Susceptible Yes Yes, >0.10 No Yes Not repaired 2115D Supply from RWST 02-CH-MOV- Main Charging SPS 2 Charging 3 Close No Low Not Susceptible Yes Yes, >0.10 No Yes Not repaired 2289A Header Isolation 02-CH-MOV- Main Charging SPS 2 Charging 3 Close No Low Not Susceptible Yes Yes, >0.10 No Yes Not repaired 2289B Header Isolation Residual Heat Removal Outlet 02-RH-MOV- Residual Heat SPS 2 Isolation to 10X8X10 Open No Medium Not Susceptible Yes Yes, >0.10 No Yes Not repaired 2720A Removal Accumulator Discharge Line Residual Heat Removal Outlet 02-RH-MOV- Residual Heat SPS 2 Isolation to 10X8Xl0 Open No Medium Not Susceptible Yes Yes, >0.10 No Yes Not repaired 2720B Removal Accumulator Discharge Line

Serial No. 17-343A Docket Nos. 50-280/281 ADDDGV Information and Status Attachment 3 Page 4 of 5

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High Head Safety 02-SI-MOV- Safety Injection from SPS 2 4 Both Yes High Not Susceptible Yes Yes, >0.10 No Yes Not repaired 2842 Injection Charging Header to RCS Cold Legs Low Head Safety 02-SI-MOV- Safety Injection Pump Cold SPS 2 10 Both Yes Low Not Susceptible Yes Yes, >0.10 No Yes Not repaired 2864A Injection Leg Discharge Stop Valve Low Head Safety 02-SI-MOV- Safety Injection Pump Cold SPS 2 10 Both Yes Low Not Susceptible Yes Yes, >0.10" No Yes Not repaired 2864B Injection Leg Discharge Stop Valve High Head Safety 02-SI-MOV- Safety SPS 2 Injection to RCS 3 Both Yes High Not Susceptible Yes Yes, >0.10 No Yes Not repaired 2867C Injection Cold Legs High Head Safety 02-SI-MOV- Safety Not Susceptible(!)

SPS 2 Injection to RCS 3 Both Yes High Yes Yes, >0.10 No Yes Not repaired 2867D Injection Cold Legs Low Head Safety 02-SI-MOV- Safety Injection Pump Hot SPS 2 10X8X10 Both Yes Low Not Susceptible Yes No No Yes Not repaired 2890A Injection Leg Discharge Stop Valve

Serial No. 17-343A Docket Nos. 50-280/281 ADDDGV Information and Status Attachment 3 Page 5 of 5

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Low Head Safety 02-SI-MOV- Safety Injection Pump Hot SPS 2 10X8X10 Both Yes Low Not Susceptible Yes Yes, >0.10 No Yes Not repaired 2890B Injection Leg Discharge Stop Valve Low Head Safety 02-SI-MOV- Safety Injection Pump Cold SPS 2 10X8X10 Both Yes Low Not Susceptible(!) Yes Yes, >0.10 No Yes Not repaired 2890C Injection Leg Discharge Stop Valve (A) Applied Wedge Pin Torque must bound anticipated design basis operating torque requirements and current maximum total torque.

(1) This valve was considered susceptible in the August 31, 2017 response letter. Re-evaluation to the BWROG guidance indicates this valve is not susceptible, but the commitment to repair is not being changed.