ML102180369

OL - Fyi: for Your Action - Watts Bar Unit 2 - GL 1995-07

ML102180369
Person / Time
Site:	Watts Bar
Issue date:	07/28/2010
From:	Office of Nuclear Reactor Regulation
To:	Division of Operating Reactor Licensing
References
Download: ML102180369 (3)

Text

WBN2Public Resource From: Lamb, John Sent: Wednesday, July 28, 2010 8:12 PM To: McMurtray, Anthony; Farnan, Michael Cc: Raghavan, Rags; Milano, Patrick; Campbell, Stephen; Wiebe, Joel; WBN2HearingFile Resource

Subject:

FYI: For Your Action - Watts Bar Unit 2 - GL 1995-07 From: Crouch, William D [1]

Sent: Wednesday, July 28, 2010 4:09 PM To: Lamb, John; Wiebe, Joel; Poole, Justin; Milano, Patrick Cc: Arent, Gordon; Thompson, Jeffery S; Freeman, Edwin E; Pointer, Kenneth; Stephenson, Catherine L

Subject:

RE: For Your Action - Watts Bar Unit 2 - GL 1995-07 In response to your email (below) dated July 8, 2010, the below response is provided. If you have any questions, please give me a call. If you need these submitted formally, please let me know.

William D. (Bill) Crouch (423) 3652004 WBN (256) 7777676 Cell Question: Regarding Watts Bar Unit 2 response to GL 1995-07 for pressure locking/thermal binding, please:

1) List the valves that require modifications:

Answer: The 9507 review of WBN Unit 2 GL 8910 motor operated valves has been completed with the following conclusions.

• Eleven valves identified for Disk Modification

1. 2-FCV-1-16

2. 2-FCV-63-8

3. 2-FCV-63-11

4. 2-FCV-63-156

5. 2-FCV-63-157

6. 2-FCV-74-1

7. 2-FCV-74-2

8. 2-FCV-74-8

9. 2-FCV-74-9

10. 2-FCV-74-33

11. 2-FCV-74-35

• Seven valves identified for Valve Bonnet Modification

1. 2-FCV-63-72

2. 2-FCV-63-73

3. 2-FCV-63-172

4. 2-FCV-72-40

5. 2-FCV-72-41

6. 2-FCV-72-44

7. 2-FCV-72-45 1

Additionally, controls for valves 2FCV722 and 39 will be modified to add a time delay which will eliminate the potential for pressure locking, as is done with Unit 1 valves 1FCV722 and 39. Note this is a controls mod and not a valve modification.

2) List the valves that are missing:

Answer: There are no missing Generic Letter 9507 valves. The 20 valves identified above are currently installed in WBN Unit 2.

3) Has there been any plant modifications that have changed the original assessment for Watts Bar Unit 1 and the impact on Watts Bar Unit 2?

Answer: In addition to the time delay changes mentioned above, there are 2 other Unit 1 valves 1FCV6325 and 26, which are being evaluated for GL 9507 impacts to address new input parameters from the JOG Topical Report MPR 2524A. Unit 1 has initiated a design change to address JOG pressure locking and MOV requirements. These changes will be evaluated for impact to the equivalent Unit 2 valves 2FCV6325 and 26.

From: Lamb, John [2]

Sent: Thursday, July 08, 2010 11:08 AM To: Crouch, William D; Arent, Gordon Cc: WBN2HearingFile Resource; Wiebe, Joel; Raghavan, Rags; Milano, Patrick; Haag, Robert; Campbell, Stephen

Subject:

For Your Action - Watts Bar Unit 2 - GL 1995-07 Importance: High Bill & Gordon, Regarding Watts Bar Unit 2 response to GL 1995-07 for pressure locking/thermal binding, please

1. list the valves that require modifications,

2. list the valves that are missing, and

3. has there been any plant modifications that have changed the original assessment for Watts Bar Unit 1 and the impact on Watts Bar Unit 2?

Thanks.

John 2

Hearing Identifier: Watts_Bar_2_Operating_LA_Public Email Number: 51 Mail Envelope Properties (BE1CC4A72435624D84F8699734202B3E1FAEF9383B)

Subject:

FYI: For Your Action - Watts Bar Unit 2 - GL 1995-07 Sent Date: 7/28/2010 8:12:27 PM Received Date: 7/28/2010 8:12:28 PM From: Lamb, John Created By: John.Lamb@nrc.gov Recipients:

"Raghavan, Rags" <Rags.Raghavan@nrc.gov>

Tracking Status: None "Milano, Patrick" <Patrick.Milano@nrc.gov>

Tracking Status: None "Campbell, Stephen" <Stephen.Campbell@nrc.gov>

Tracking Status: None "Wiebe, Joel" <Joel.Wiebe@nrc.gov>

Tracking Status: None "WBN2HearingFile Resource" <WBN2HearingFile.Resource@nrc.gov>

Tracking Status: None "McMurtray, Anthony" <Anthony.McMurtray@nrc.gov>

Tracking Status: None "Farnan, Michael" <Michael.Farnan@nrc.gov>

Tracking Status: None Post Office: HQCLSTR01.nrc.gov Files Size Date & Time MESSAGE 3199 7/28/2010 8:12:28 PM Options Priority: Standard Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date:

Recipients Received: