ML12073A391

Instrumentation and Controls Staff Information Requests

ML12073A391
Person / Time
Site:	Watts Bar
Issue date:	03/09/2012
From:	Hruby R Tennessee Valley Authority
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
TAC ME0853
Download: ML12073A391 (7)

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 9, 2012 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555-0001 Watts Bar Nuclear Plant, Unit 2 10 CFR 50.4 NRC Docket No. 50-391

Subject:

WATTS BAR NUCLEAR PLANT (WBN) UNIT 2 - INSTRUMENTATION AND CONTROLS STAFF INFORMATION REQUESTS

References:

1. Supplemental Safety Evaluation Report (SSER) 22, 23, 24 and 25 Appendix HH Watts Bar Unit 2 Action Items Table

2. NRC to TVA letter dated November 18, 2011, "Watts Bar Nuclear Plant, Unit 2 -

Request for Additional Information Regarding Supplemental Safety Evaluation Report Open Items 80, 81, 94, 105, and 108" (TAC NO. ME0853)

3. NRC to TVA e-mail (J. Poole, NRC, to G. Arent, TVA), "Draft Request for Additional Information Regarding Open Item 98," sent December 12, 2011 The purpose of this letter is to answer NRC requests for additional information (RAIs) provided in References 2 and 3. These RAIs are related to open items in Reference 1. to this letter provides TVA's responses to the information requested by NRC. contains a list of attachments that support the TVA's responses provided in . Enclosure 3 provides the list of new regulatory commitments contained in this letter. contains information proprietary to Westinghouse Electric Company LLC (WEC). contains the necessary information supporting the request for withholding such information. TVA requests that the WEC proprietary information be withheld from public disclosure in accordance with 10 CFR § 2.390.

If you have any questions, please contact Gordon Arent at (423) 365-2004.

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U.S. Nuclear Regulatory Commission Page 2 March 9, 2012 I declare under penalty of perjury that the foregoing is true and correct to the best of my knowledge. Executed on the 9 th day of March 2012.

Respectfully, Raymond A. Hruby, Jr.

General Manager, Technical Services Watts Bar Unit 2

Enclosures:

1. TVA Responses to Instrumentation and Controls Staff Information Requests

2. List of Attachments

3. List of New Regulatory Commitments cc (Enclosures):

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 I TVA Letter Dated March 9, 2012 TVA Responses to Instrumentation and Controls Staff Information Requests ACRONYMS AND ABBREVIATIONS The following acronyms/abbreviations are used in this letter:

ABB ASEA Brown Boveri CIT/FAT Channel Integration Test/Factory Acceptance Test Common Q Common Qualified Platform CRC Cyclic Redundancy Check EDMS Enterprise Document Management System TM

'IEEEE Institute of Electrical and Electronics Engineers IV&V Independent Verification and Validation MTP Maintenance and Test Panel NRC Nuclear Regulatory Commission PAMS Post Accident Monitoring System PLC Programmable Logic Controller QMS Quality Management System RAI Request for Additional Information RG Regulatory Guide RVLIS Reactor Vessel Level Indicating System SDOE Secure Development and Operating Environment SER Safety Evaluation Report SRR Software Release Record SRS Software Requirements Specification SSER Supplemental Safety Evaluation Report SysRS System Requirements Specification TVA Tennessee Valley Authority V&V Verification and Validation WBN Watts Bar Nuclear Plant WEC Westinghouse Electric Company LLC NOTE

1. For the NRC RAIs in this letter, a response has been provided in previous TVA letters. The NRC subsequently requested additional information. Previous TVA responses are not repeated below. Additional NRC information requests are identified in this letter as "NRC Follow-up Request." TVA responses to these items are identified as "TVA Response to NRC Follow-up Request."

IEEE is a registered trademark of the Institute of Electrical and Electronics Engineers Inc.

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Enclosure 1 TVA Letter Dated March 9, 2012 TVA Responses to Instrumentation and Controls Staff Information Requests RAI RESPONSES NRC Follow-up Request (SSER 23 Appendix HH Item Number 94)

By letter dated September 1, 2011, TVA provided a response to Open Item Number 94.

The response provided by TVA is incomplete since it only addressed Institute of Electrical and Electronics Engineering Standard 603-1991 Clause 4; the response was silent on the other clauses (e.g., Clauses 5 & 6). The response also did not identify how the Common Q Post-Accident Monitoring System (PAMS) design meets the documented design basis requirements.

a. Please provide detail and specific design basis information for core exit thermocouple and subcooled margin monitor indications associatedwith "Type A" manual actions.

b. Please provide to the staff information that demonstrates that the Watts Bar Nuclear Plant (WBN), Unit 2 Common Q PAMS design meets the applicabledesign basis requirements (e.g., trace from design basis to design).

Note: Clauses 5.2, 6.1, 6.6, 7, & 8 are not applicable to the technicalreview of the Common Q PAMS.

TVA Response to NRC Follow-up Request The response to this item is contained in Attachment 4, TVA white paper "Common Q PAMS Design Basis Conformance to the Requirements of 2IEEE 603"-1991," dated March 8, 2012.

2. NRC Follow-up Request (SSER 23 Appendix HH Item Number 98)

Note: TVA responded to the initial NRC RAI by letter dated September 1, 2011. With the exception of item 2.h.,TVA responded to the follow-up NRC information requests by letters dated December 22, 2011, and March 2, 2012.

2.h In Section 2.5.3, IV&V Phase Summary Report and Software Release Records are given as outputs of the implementation phase. Please confirm if WNA-VR-00283-WBT P, Rev. 4 (ML110770540) is the appropriateIV&V Phase Summary Report Record. Please provide a reference for Software Release Records documents and submit on docket.

TVA Response to NRC Follow-up Request WNA-VR-00283-WBT-P is the appropriate IV&V Phase Summary Report Record; however, the Software Release Record (SRR) listing provided in revision 4 was not complete.

2 IEEE 603 is a registered trademark of the Institute of Electrical and Electronics Engineers Inc.

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Enclosure 1 TVA Letter Dated March 9, 2012 TVA Responses to Instrumentation and Controls Staff Information Requests In response to item 2.h, a review was performed of WNA-LI-00058-WNA, Revision 3, "Post-Accident Monitoring System (PAMS) Licensing Technical Report," and WNA-VR-00283-WBT-P, Revision 6, "IV&V Summary Report for the Post Accident Monitoring System." The review determined that no single complete listing of SRRs existed and the listings in the two documents were inconsistent. As a result, the decision was made to revise both documents. The complete listing of SRRs was incorporated into WEC proprietary document WNA-VR-00283-WBT-P (Attachment 1), Revision 7, "IV&V Summary Report for the Post Accident Monitoring System," dated February 2012 as Tables 5-1, 5-2 and 5-3. The partial listing in WNA-LI-00058-WNA was replaced by a reference to WNA-VR-00283-WBT-P.

Attachment 2 contains WEC non-proprietary document WNA-VR-00283-WBT-NP, Revision 7, "IV&V Summary Report for the Post Accident Monitoring System," dated February 2012. Attachment 3 contains WEC non-proprietary document CAW 12-3425, "Application for Withholding Information From Public Disclosure WNA-VR-00283-WBT-P, Revision 7, 'IV&V Summary Report for the Post Accident Monitoring System,'

(Proprietary)," dated March 1, 2012.

3. NRC Follow-up Request (SSER 23 Appendix HH Item Number 105)

TVA did not provide the information requested. The intent of Action Item Number 105 was to request an explicit mapping between the design bases (providedin response to Action Item Number 94) and the detailed design requirements. This mapping has not been provided.

Please provide an explicit mapping between the design bases and the detailed design requirements (i.e., between the informationprovided in response to Action Item Number 94 and the WBN Unit 2 Common Q PAMS SysRS).

TVA Response to NRC Follow-up Request The response to this item is contained in Attachment 4, TVA white paper "Common Q PAMS Design Basis Conformance to the Requirements of IEEE 603-1991," dated March 8, 2012.

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Enclosure 2 TVA Letter Dated March 9, 2012 List of Attachments Note: While project coversheets have not been included, the attachments have been reviewed and approved by Engineering prior to submittal.

1. WEC proprietary document WNA-VR-00283-WBT-P, Revision 7, "IV&V Summary Report for the Post Accident Monitoring System," dated February 2012 (Letter Item 2, SSER 23 Appendix HH Item Number 98)

2. WEC non-proprietary document WNA-VR-00283-WBT-NP, Revision 7, "IV&V Summary Report for the Post Accident Monitoring System," dated February 2012 (Letter Item 2, SSER 23 Appendix HH Item Number 98)

3. WEC non-proprietary document CAW 12-3425, "Application for Withholding Information From Public Disclosure WNA-VR-00283-WBT-P, Revision 7, 'IV&V Summary Report for the Post Accident Monitoring System,' (Proprietary)," dated March 1, 2012 (Letter Item 2, SSER 23 Appendix HH Item Number 98)

4. TVA white paper "Common Q PAMS Design Basis Conformance to the Requirements of IEEE 603-1991," dated March 8, 2012 (Letter Items 1 and 3, SSER 23 Appendix HH Item Numbers 94 and 105)

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Enclosure 3 TVA Letter Dated March 9, 2012 List of New Regulatory Commitments The following new regulatory commitments are contained in TVA white paper "Common Q PAMS Design Basis Conformance to the Requirements of IEEE 603-1991," dated March 8, 2012 (Attachment 4).

1. RVLIS will be included as a Type A variable in the next revision of TVA calculation WBNOSG4047, "PAM Type 'A' Variables Determination."

2. WBN Unit 2 FSAR,, Table 7.5-2, "Regulatory Guide 1.97 Post Accident Monitoring Variables Lists," will be updated to show RVLIS as a Type "A" variable in a future amendment.

3. WVA Design Criteria Document WB-DC-30-7, Revision 24, "Post Accident Monitoring Instrumentation," will be updated to show RVLIS as a Type "A" variable in a future revision.

4. WBN Unit 2 Technical Specifications Table 3.3.3-1 Line item 6 Reactor Vessel Water Level will be revised to remove the reference to note (g).

5. WBN Unit 2 Technical Specification Bases will be revised to identify RVLIS as a Type "A" variable.

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