ML110620411

Instrumentation and Controls Staff Information Requests

ML110620411
Person / Time
Site:	Watts Bar
Issue date:	03/02/2011
From:	Stinson D Tennessee Valley Authority
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
Download: ML110620411 (3)

Text

Attachment 1 is to be withheld from public disclosure under 10 CFR 2.390. When separated from this attachment, this letter is decontrolled.

Tennessee Valley Authority, Post Office Box 2000, Spring City, Tennessee 37381-2000 March 2, 2011 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555-0001 Watts Bar Nuclear Plant, Unit 2 NRC Docket No. 50-391 10 CFR 50.4

Reference:

WATTS BAR NUCLEAR PLANT (WBN) UNIT 2 - INSTRUMENTATION AND CONTROLS STAFF INFORMATION REQUESTS TVA letter to NRC dated December 22, 2010, "Watts Bar Nuclear Plant (WBN)

Unit 2 - Instrumentation and Controls Staff Information Requests" The purpose of this letter is to provide documents that TVA committed in the referenced letter to send to NRC in support of its review of the Common Q Post-Accident Monitoring System (PAMS) documents. Specifically, as stated in TVA's December 22, 2010 letter to NRC (Reference):

During review of recent Common Q document submittals, discrepancies were identified in various documents. These discrepancies are identified in Attachment 18.

Excerpt from Referece 1, Attachment 18

5. WNA-AR-00180-WBT-P, Revision 0, "Failure Modes and Effects Analysis (FMEA) for the Post Accident Monitoring System," dated October 2010

a. Section 2.2 "System Description" and Table 3-1 "WB2 PAMS FMEA: Change "FE switch" to "FE keyswitch."

b. Table 3-1: Change "Functional Enable (FE) switch" to "Function Enable (FE) keyswitch and "FE key-switch" to "FE keyswitch".

The discrepancies identified above will be corrected in the next revision of the identified documents. TVA will submit the revised documents within two weeks of receipt from Westinghouse.

U.S. Nuclear Regulatory Commission Page 2 March 2, 2011 The Westinghouse Electric Company (WEC) has revised and reissued the proprietary and non-proprietary versions of WNA-AR-001 80-WBT to address these discripancies and are attached to this letter. The Enclosure contains a detailed list of the attached documents that TVA committed to send to NRC. contains information proprietary to WEC. TVA requests that the WEC proprietary information be withheld from public disclosure in accordance with 10 CFR § 2.390. contains the corresponding non-proprietary version of the document. The corresponding affidavit for withholding proprietary information from public disclosure is contained in Attachment 3. As requested by the NRC, the attached documents have been reviewed and approved by engineering.

This letter does not contain'any new regulatory commitments. If you have any questions, please contact William Crouch at (423) 365-2004.

I declare under penalty of perjury that the foregoing is true and correct. Executed on the 2 nd day of March, 2011.

Respectfully, David Stinson Watts Bar Unit 2 Vice President

Enclosure:

List of Attachments cc (Enclosure):

U. S. Nuclear Regulatory Commission Region II Marquis One Tower 245 Peachtree Center Ave., NE Suite 1200 Atlanta, Georgia 30303-1257 NRC Resident Inspector Unit 2 Watts Bar Nuclear Plant 1260 Nuclear Plant Road Spring City, Tennessee 37381

Enclosure TVA Letter Dated March 2, 2011 Responses to Licensee Open Items to be Resolved for SER Approval List of Attachments

1.

Westinghouse Electric Company WNA-AR-001 80-WBT-P, Revision 2, "Failure Modes and Effects Analysis (FMEA) for the Post Accident Monitoring System," (Proprietary), dated February 2011

2.

Westinghouse Electric Company WNA-AR-001 80-WBT-NP, Revision 2, "Failure Modes and Effects Analysis (FMEA) for the Post Accident Monitoring System," dated February 2011

3.

CAW-1 1-3117, Application for Withholding Proprietary Information from Public Disclosure, WNA-AR-00180-WBT-P, Revision 2, "Failure Modes and Effects Analysis (FMEA) for the Post Accident Monitoring System," (Proprietary), dated February 25, 2011 1