ML12065A142

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OL - TVA Letter to NRC_03-02-2012_I&C RAI Response
ML12065A142
Person / Time
Site: Watts Bar Tennessee Valley Authority icon.png
Issue date: 03/02/2012
From:
- No Known Affiliation
To:
Division of Operating Reactor Licensing
References
Download: ML12065A142 (17)
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Text

WBN2Public Resource From: Boyd, Desiree L [dlboyd@tva.gov]

Sent: Friday, March 02, 2012 10:45 AM To: Epperson, Dan; Poole, Justin; Raghavan, Rags; Milano, Patrick; Campbell, Stephen Cc: Arent, Gordon; Bryan, Robert H Jr; Boyd, Desiree L; Hamill, Carol L

Subject:

TVA letter to NRC_03-02-2012_I&C RAI Response Attachments: 03-02-2012_I&C RAI Response_Final.pdf Please see attached TVA letter that was sent to the NRC today.

For those of you who receive a cc in the mail, the attachments will be included with your letter.

Thank You,

~*~*~*~*~*~*~*~*~*~*~

Désireé L. Boyd WBN Unit 2 Licensing dlboyd@tva.gov 423-365-8764 1

Hearing Identifier: Watts_Bar_2_Operating_LA_Public Email Number: 673 Mail Envelope Properties (7AB41F650F76BD44B5BCAB7C0CCABFAF298CE603)

Subject:

TVA letter to NRC_03-02-2012_I&C RAI Response Sent Date: 3/2/2012 10:44:51 AM Received Date: 3/2/2012 10:43:55 AM From: Boyd, Desiree L Created By: dlboyd@tva.gov Recipients:

"Arent, Gordon" <garent@tva.gov>

Tracking Status: None "Bryan, Robert H Jr" <rhbryan@tva.gov>

Tracking Status: None "Boyd, Desiree L" <dlboyd@tva.gov>

Tracking Status: None "Hamill, Carol L" <clhamill@tva.gov>

Tracking Status: None "Epperson, Dan" <Dan.Epperson@nrc.gov>

Tracking Status: None "Poole, Justin" <Justin.Poole@nrc.gov>

Tracking Status: None "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 Post Office: TVANUCXVS2.main.tva.gov Files Size Date & Time MESSAGE 380 3/2/2012 10:43:55 AM 03-02-2012_I&C RAI Response_Final.pdf 163814 Options Priority: Standard Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date:

Recipients Received:

Attachments 1 and 7 are to be withheld from public disclosure under 10 CFR § 2.390.

When separated from these attachments, this letter is decontrolled.

Tennessee Valley Authority, Post Office Box 2000, Spring City, Tennessee 37381-2000 March 2, 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

Reference:

Supplemental Safety Evaluation Report (SSER) 22, 23, 24 and 25 Appendix HH Watts Bar Unit 2 Action Items Table The purpose of this letter is to provide TVAs responses to NRC information requests regarding:

x 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) (ML113130218) x 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 x NRC to TVA e-mail (J. Poole, NRC, to G. Arent, TVA), Draft Request for Additional Information Regarding Open Item 126, sent February 13, 2012 to this letter provides TVAs responses to the information requested by NRC. contains a list of attachments that support TVAs responses provided in . Enclosure 3 contains the list of references associated with TVAs commitments and responses. Enclosure 4 lists the new regulatory commitment contained in this letter. contains information proprietary to General Atomics Electronic Systems, Inc.,

(GA-ESI). TVA requests that the GA-ESI proprietary information be withheld from public disclosure in accordance with 10 CFR § 2.390. contains information proprietary to Westinghouse Electric Company LLC (WEC). contains the necessary information supporting the request for withholding such

U.S. Nuclear Regulatory Commission Page 3 March 2, 2012 bcc (Enclosures):

Stephen Campbell U.S. Nuclear Regulatory Commission MS 08H4A One White Flint North 11555 Rockville Pike Rockville, Maryland 20852-2738 Darrell Roberts, Acting Deputy Regional Administrator for Construction U. S. Nuclear Regulatory Commission Region II Marquis One Tower 245 Peachtree Center Ave., NE Suite 1200 Atlanta, Georgia 30303-1257 David Rahn U.S. Nuclear Regulatory Commission MS 09D2 One White Flint North 11555 Rockville Pike Rockville, Maryland 20852-2738 George A. Wilson, Jr.

U.S. Nuclear Regulatory Commission MS 09E3 One White Flint North 11555 Rockville Pike Rockville, Maryland 20852-2738

Enclosure 1 TVA Letter Dated March 2, 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 BISI Bypassed and Inoperable Status Indication CIT/FAT Channel Integration Test/Factory Acceptance Test Common Q Common Qualified Platform CRC Cyclic Redundancy Check EDCR Engineering Document Change Request EDMS Enterprise Document Management System EQ Environmental Qualification FSAR Final Safety Analysis Report GA-ESI General Atomics-Electronic Systems, Inc.

ICI In-Core Instrument IITA In-Core Instrument Thimble Assembly 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 SDOE Secure Development and Operating Environment SER Safety Evaluation Report SSER Supplemental Safety Evaluation Report TVA Tennessee Valley Authority V&V Verification and Validation WBN Watts Bar Nuclear Plant WEC Westinghouse Electric Company LLC NOTE

1. For some NRC requests for additional information (RAIs), this letter provides TVAs initial response. For the other NRC RAIs in this letter, a response has been provided in previous TVA letters to the NRC, and the NRC has subsequently requested additional information.

For these requests, the initial TVA response is not repeated below. The additional NRC information requests are identified in this letter as Follow-up NRC Requests. TVA responses to these items are identified as TVA Response to Follow-up NRC Request.

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Enclosure 1 TVA Letter Dated March 2, 2012 TVA Responses to Instrumentation and Controls Staff Information Requests RAI AND COMMITMENT RESPONSES

1. NRC Request (SSER 23 Appendix HH Item Number 98)

TVA should demonstrate that the WBN Unit 2 Common Q PAMS is in conformance with RG 1.152, Revision 2, or provide justification for not conforming. (Section 7.5.2.2.3)

Follow-up NRC Request The following RAIs are regarding the Watts Bar 2 Common Q PAMS Secure Development and Operational Environment. The action associated with this review area is captured in SSER 23 Appendix HH, Action Item 98 (ML11270A306). TVA submitted documents (reference below) on September 1, 2011 to address this item.

1) Platform Development - The US Nuclear Regulatory Commission staff notes that the Common Q platform was subject to commercial grade dedication and that a topical report on the platform was reviewed and approved by the staff (ML003740165).

However, at the time of the staffs previous review, no evaluation was performed regarding the secure development environment for the Common Q platform and the staff is aware that the platform has undergone changes. Regulatory Guide 1.152, Revision 3, which is cited by the licensee as being used to conform to establishing a secure development environment, contains regulatory positions related to ensuring that superfluous features are not present in software-based safety systems that could present the potential for degrading the reliable operation of the system.

a) Since the Common Q platform was originally designed to potentially serve in several different plant applications, please provide references for and a description of any analyses that were performed to determine if there are any superfluous functions or features resident on the platform (i.e., in any of the platform software or software-driven components, such as PLCs) that are not utilized by the Common Q platform or post accident monitoring system (PAMS) application, as well as a summary of the results of such analyses. If any unnecessary functions or features were identified, please explain what measures were taken to resolve any potential impact on the Common Q platform or PAMS application operation (i.e.,

were features disabled, removed or determined by analysis not to have potential to impact operations?). [e.g., the staff notes that in Attachment 9 of the September 1, 2011, Request for Additional Information responses (ML11257A050), it is stated that the Function Enable keyswitch on the Operators Module was not installed for the Watts Bar Unit 2 PAMS application, and that the Operators Module has no connection to a printer.]

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Enclosure 1 TVA Letter Dated March 2, 2012 TVA Responses to Instrumentation and Controls Staff Information Requests b) It is essential that the Common Q platform operating system software be maintained in a fashion that protects it from unauthorized changes. Please confirm that WNA-LI-00058-WBT-P, Rev. 3, Sections 2.2.1 and 2.2.2 (ML110950334) describe the changes made to the platform. If not, please provide a description of changes made (including removal of unnecessary features) to the Common Q operating system software since it was initially subject to commercial grade dedication and analyses were performed of the features resident on the platform.

Please describe the processes followed to ensure that only authorized changes have been made.

c) WCAP-17427-P, Revision 1 (ML11257A061) states that the approved version of the QNX software is protected by a CRC stamp to ensure that the correct configuration is used. For the WBN Unit 2 PAMS application, provide documentation indicating your confirmation that the CRC stamp for QNX was verified to be the correct version intended for use.

d) WCAP-17427-P, Revision 1 states that the AC160 software is under strict configuration controls and that any changes are jointly approved by Westinghouse and ABB. Please confirm that the summary of changes provided in Section 2.2.2 of WNA-LI-00058-WBT-P, Revision 3 (ML110950334) accurately reflects modifications since dedication. Also, please describe what measures were taken to ensure that the correct, commercially-dedicated version of AC160 software is installed on the WBN Unit 2 PAMS system.

2) Application Development - Staff reviewed WCAP-17427-P, Revision 1 and found it to be largely consistent with APP-GW-J0R-012, Revision 1 (ML102170268 dated June 2010). However, much of the processes described are in future-tense and it is not clear to the staff what actions were accomplished for this particular Watts Bar Unit 2 PAMS application development to establish a secure development environment.

WCAP-17427-P, Rev 1 (ML11257A061 dated August 2011) describes the security assessment for the Common Q PAMS for Watts Bar Unit 2.

a. In Section 2.2.3.1.1.a, the statement is made that the Westinghouse Quality Management System (QMS) will be followed to ensure documents from hardware and software development efforts are adequately protected. Specifically, the section states that documents are to be stored in the Enterprise Document Management System (EDMS).

i)Please identify what documents related to the Common Q platform development (relevant to the Watts Bar 2 PAMS) are protected under the QMS / EDMS.

ii)Please identify what documents related to the Watts Bar 2 PAMS development are protected under the QMS/EDMS.

b. In Section 2.2.3.1.1.b, discussions of controls contained in the Software Program Manual are detailed. Please provide a confirmatory statement that the Watts Bar 2 PAMS development process conformed to these controls.

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Enclosure 1 TVA Letter Dated March 2, 2012 TVA Responses to Instrumentation and Controls Staff Information Requests

c. In Section 2.2.3.2, items 2. and 3. are identical. Please clarify if one of these items is intended to state something else.
d. In Section 2.2.3.2, the statement is made that during the implementation phase, software shall be code reviewed by IV&V using a defined checklist for adherence to coding standards and application requirements. Please clarify if this step was performed for the Watts Bar Unit 2 PAMS application. Please clarify if WNA-VR-00283-WBT-P, Rev.4 (ML110770540) contains this record. If not, please provide a reference for the code review results and provide a statement indicating the findings of the review.
e. In Section 2.3.1.5, the statement is made that the security requirements shall be verified and validated as part of the overall system requirements. Please clarify if this step was performed for the Watts Bar Unit 2 PAMS application. Please clarify if WNA-VR-00283-WBT-P, Rev. 4 (ML110770540) contains this record. If not, please provide a reference for the results of the V&V of the security requirements and provide a statement indicating the findings of the V&V.
f. In Section 2.4.1, the statement is made that an assessment of the PAMS will be performed to verify that requirements for security controls are implemented correctly in the design. Please clarify if this step was performed for the Watts Bar Unit 2 PAMS application. Please clarify if WNA-VR-00283-WBT-P, Rev.4 (ML110770540) contains this record. If not, please provide a reference for the results of the V&V of the security requirements and provide a statement indicating the findings of the assessment.
g. In Section 2.5.1.1, the statement is made that an IV&V assessment will be performed of the security requirements during the implementation phase and that any anomalies will be documented. Please clarify if this step was performed for the Watts Bar Unit 2 PAMS application. Please clarify if WNA-VR-00283-WBT-P, Rev.4 (ML110770540) contains this record. If not, please provide a reference for the results of the IV&V of the security requirements. Please provide a brief summary of any anomalies found and, if there were any, please confirm that they were resolved in accordance with the Software Program Manual processes.
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 appropriate IV&V Phase Summary Report Record. Please provide a reference for Software Release Records documents and submit on docket.
i. In Section 2.5.3, the statement is made that the code is maintained in a locked area of the configuration control system. Please provide further detail regarding the locked area of the configuration control system. (e.g., is the code stored on a removable media and physically locked somewhere? Or, is the code on an isolated computer or network and protected by software controls?).

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Enclosure 1 TVA Letter Dated March 2, 2012 TVA Responses to Instrumentation and Controls Staff Information Requests

j. In Section 2.6 (and its subsections), testing activities are described in future-tense.

Please provide a brief summary of the testing results as they pertain to security requirements for the system. Do WNA-TR-02451-WBT (ML110950332) and WNA-VR-00283-WBT-NP, Rev.4 (ML110770538) represent this evidence? If not, please provide references for the documents identified in Section 2.6.3 and submit on docket.

3. Secure Operational Environment - In order to establish compliance with IEEE-603 Clauses 5.6.3 and 5.9, the staff needs to ensure that a secure operational environment has been established for the proposed digital safety system. Regulatory Guide 1.152, Revision 3 - which the licensee has indicated it used to conform to these requirements -

provides applicable regulatory positions.

a. Please provide a description of the analyses performed to establish what digital systems are connected to the PAMS, what behaviors those systems are capable of either in a normal or failed operating state and what measures were taken in the PAMS design or Watts Bar operations to ensure its reliable operation in the presence of those potentially adverse behaviors.
b. Please provide a description of the analyses performed to establish what points of physical and logical access are present to allow interaction with the PAMS and what measures were taken in the PAMS design or Watts Bar operations to provide assurance that only authorized personnel can access the system.
c. The Watts Bar Nuclear Unit 2 Common Q Post Accident Monitoring System Conformance to the Secure Development and Operational Environment Requirements of Regulatory Guide 1.152 Revision 3 document (ML11257A050 dated September 1, 2011) describes the licensees activities relative to SDOE.

i) In Section 1.e (on page 7), it is noted that the testing of the Maintenance and Test Panel (MTP) software data diode function was included in the CIT/FAT and that the software data diode is the qualified isolation device. Please provide a summary of testing performed for this software data diode (i.e., did the testing consist of just the data storm testing or were there other tests?). Also, please elaborate on what is intended by the term qualified (i.e., Does it indicate that it has been formally tested? Or is there some other pedigree implied by the term?)

ii) In Section 2.a.i.(1) (on page 8), the statement is made that the touch screen on the Operators Modules could change constants or alarm setpoints if the Function Enable keyswitch was placed in the enable position. In Section 1.b of the same document, it is noted that the Function Enable keyswitch was not installed on the Operators Module for the PAMS. Please confirm that the Operators Panel does not possess a Function Enable keyswitch. [Note: Sections 2.a.i.(2) and 2.a.vi.(1) also mention the Function Enable keyswitch in regard to the Operators Module.]

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Enclosure 1 TVA Letter Dated March 2, 2012 TVA Responses to Instrumentation and Controls Staff Information Requests iii) In Section 2.a.v (on page 9), use of a hardware data diode is noted. Please clarify if this is the device referenced in the response to RAI 14b submitted on July 30, 2010 (ML102160349). If not, please provide information on the specific hardware used (i.e., vendor and model number).

TVA Partial Response to Follow-up NRC Request Note: The response to Draft Request for Additional Information Regarding Open Item 98, sent December 12, 2011, Item 3, was provided in TVA to NRC letter dated December 22, 2011 (Reference 1). With the exception of item 2.h, items 1 and 2 are addressed below.

The responses to items 1 and 2 are provided in WEC proprietary document WBT-D-3769 P-Enclosure, Watts Bar 2 Common Q PAMS Secure Development and Operational Environment SSER 23 Appendix HH Action Item 98 Requests for Additional Information.

Attachment 1 contains WEC proprietary document WBT-D-3769 P-Enclosure, Watts Bar 2 Common Q PAMS Secure Development and Operational Environment SSER 23 Appendix HH Action Item 98 Requests for Additional Information, dated February 2012.

Attachment 2 contains WEC non-proprietary document WBT-D-3769 NP-Enclosure, Watts Bar 2 Common Q PAMS Secure Development and Operational Environment SSER 23 Appendix HH Action Item 98 Requests for Additional Information, dated February 2012.

Attachment 3 contains WEC non-proprietary document CAW-12-3385, Application for Withholding Information From Public Disclosure WBT-D-3769 P-Enclosure, Watts Bar 2 Common Q PAMS Secure Development and Operational Environment SSER 23 Appendix HH Action Item 98 Requests for Additional Information, (Proprietary), dated February 6, 2012.

Item 2.h will be addressed by submittal of WNA-VR-00283-WBT-P, Revision 7, IV&V Summary Report, which will be submitted within three weeks of receipt from WEC.

2. NRC Request (SSER 24 Appendix HH Item Number 126)

To enable the NRC staff to evaluate and review the IITA environmental qualification, TVA should provide the summary report of the environmental qualification for the IITA. (SSER 24, Section 7.7.1.9.5)

Follow-up NRC Request Action Item No. 126 identified in Nuclear Regulatory Commission (NRC) NUREG-0847 Safety Evaluation Report Related to the Operation of Watts Bar Nuclear Plant, Unit 2, Supplement 24 (ADAMS Accession No. ML1277A148), Section 7.7.1.9, In-Core Instrumentation System, requires Tennessee Valley Authority (TVA) to provide the summary report of the environmental qualification for the IITA.

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Enclosure 1 TVA Letter Dated March 2, 2012 TVA Responses to Instrumentation and Controls Staff Information Requests In TVAs November 30, 2011 submittal (ADAMS Accession No. ML113410393), TVA provided a response for this item. To complete our review on this item, the NRC requires TVA to clarify the scope of Westinghouse WBT-D-3566 qualification summary report, which was included as Attachment 9. Specifically, the report states that [t]he Class 1E Qualification Program applies to only the ex-vessel portion of the ICI [In-Core Instrument]

assembly. However, the qualification hardware and results provided in the report explain that the thermocouples were part of the qualification testing, which indicate that the in-vessel portion of the ICI assembly was tested. Please clarify the scope and results of the qualification testing performed on the ICI assembly.

TVA Response to Follow-up NRC Request Environmental Testing:

The following response was provided in WBT-D-3806 NP-Enclosure, dated February 2012, Open Item No.126 and Request for Supplemental Information Watts Bar Unit 2, to WEC letter WBT-D-3806, dated February 29, 2012, Response to NRC RAI on Open Item 126 (WINCISE), (Reference 2).

The ex-vessel portion of the Incore Instrument Thimble Assembly (IITA) (i.e., from the Swagelok fitting to the electrical connector) was subjected to the conditions of the EQ test. This ex-vessel portion is representative of the IITA that will be installed at WBN Unit 2. All components of the in-vessel portion of the qualification assembly were not completely identical to the WBN Unit 2 IITA as shown below:

a. Due to limitations of the test bed, the in-vessel portion of the qualification assembly was not the full length of the production IITA.
b. Since the self-powered neutron detectors are not required to be qualified, they were simulated using copper wires.

The thermocouple used in the in-vessel portion of the qualification assembly was a Type K thermocouple, which is the same as in the production IITAs.

During the EQ testing, the sensing end of the thermocouple (located in the in-vessel portion of the qualification assembly) was heated to a known temperature. The ex-vessel portion of the IITA was subjected to the conditions described in WBT-D-3566 and CE-NPSD-240-P, and the thermocouple response was observed.

Seismic Testing Both the ex-vessel and in-vessel portions of the qualification assembly were located on the seismic table during the seismic testing described in WBT-D-3566 and CE-NPSD-240-P.

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Enclosure 1 TVA Letter Dated March 2, 2012 TVA Responses to Instrumentation and Controls Staff Information Requests

3. TVA Commitment As part of the review of FSAR Section 7.6.6, the NRC reviewer requested TVA to provide objective evidence that for FCV-62-98 and FCV-62-99 the motive power has been removed in accordance with Final Safety Analysis Report (FSAR) Section 7.6.6 Spurious Actuation Protection for Motor Operated Valves.

Commitment Closure The motive power for FCV-62-98 was removed under Engineering Document Change Request (EDCR) 53287. The motive power for FCV-62-99 was removed under EDCR 53292. Attachment 4 contains excerpts of TVA document EDCR 53287, dated February 1, 2012. Attachment 5 contains excerpts of TVA document EDCR 53292 dated October 10, 2011.

4. TVA Commitment In TVA to NRC letter dated October 5, 2010 (Reference 3), TVA committed to submit the Bypassed and Inoperable Status Indication (BISI) calculation updated for WBN Unit 2.

Commitment Closure Attachment 6 contains TVA calculation WBPEVAR8807025, Revision 8, Bypassed and Inoperable Status Indication Logic Input Indications, which has been updated to reflect WBN Unit 2.

5. NRC Request During a telecom with the NRC on January 11, 2012, the NRC reviewer provided the following comment:

On page 4 of the power supply documentation package 04502050-001, Section 3, the Basic Component box is checked NO. The NRC reviewer believes that because this component is qualified by GA-ESI that it should be checked YES. If the correct box is NO, then please provide justification for this position. Otherwise, please resubmit this page with the box changed to YES.

TVA Response to NRC Request GA-ESI agreed that the Basic Component box should be checked YES. Attachment 7 contains proprietary GA-ESI replacement pages for power supply documentation package 04502050-001. Attachment 8 contains non-proprietary replacement pages for power supply documentation package 04502050-001. The NRC is requested to replace Pages 3 through 7 of the proprietary and non-proprietary versions of power supply documentation package 04502050-001 submitted in TVA to NRC letter dated January 19, 2012 (Reference 4) with Attachments 7 and 8 respectively. The GA-ESI affidavit for withholding submitted as Attachment 10 in TVA to NRC letter dated January 19, 2012 (Reference 4) is applicable to the revised pages.

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Enclosure 1 TVA Letter Dated March 2, 2012 TVA Responses to Instrumentation and Controls Staff Information Requests

6. NRC Request TVA Calculation WCGACQ0766 was submitted in TVA to NRC letter dated January 19, 2012 (Reference 4) as Attachment 11. The NRC identified that multiple instances of proprietary information statements existed in the calculation and that the calculation could not be accepted.

TVA Response to NRC Request TVA performed a review of Calculation WCGACQ0766 to determine which proprietary notations in the calculation were appropriate. The review found that the GA-ESI proprietary notation on Page 67, GA-ESI drawing 04034100, Revision C, Outline High Range Area Monitor System, was the only appropriate notation. This drawing is included as a source reference for sheet 8 of the calculation for dimensional and weight information. TVA reviewed the GA-ESI drawing and certifies that the information shown on sheet 8 is correct.

Attachment 9 contains redacted TVA calculation WCGACQ0766, Revision 1, Required Response Spectra for Evaluation of Radiation Monitoring Equipment. This replaces the calculation previously submitted as Attachment 11 in the TVA to NRC letter dated January 19, 2012 (Reference 4).

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Enclosure 2 TVA Letter Dated March 2, 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 WBT-D-3769 P-Enclosure, Watts Bar 2 Common Q PAMS Secure Development and Operational Environment SSER 23 Appendix HH Action Item 98 Requests for Additional Information, dated February 2012 (Letter Item 1, SSER 23 Appendix HH Item Number 98)
2. WEC non-proprietary document WBT-D-3769 NP-Enclosure, Watts Bar 2 Common Q PAMS Secure Development and Operational Environment SSER 23 Appendix HH Action Item 98 Requests for Additional Information, dated February 2012 (Letter Item 1, SSER 23 Appendix HH Item Number 98)
3. WEC non-proprietary document CAW-12-3385, Application for Withholding Information From Public Disclosure WBT-D-3769 P-Enclosure, Watts Bar 2 Common Q PAMS Secure Development and Operational Environment SSER 23 Appendix HH Action Item 98 Requests for Additional Information, (Proprietary), dated February 6, 2012 (Letter Item 1, SSER 23 Appendix HH Item Number 98)
4. Excerpts of TVA document EDCR 53287, dated February 1, 2012 (Letter Item 3)
5. Excerpts of TVA document EDCR 53292, dated October 10, 2011 (Letter Item 3)
6. TVA calculation WBPEVAR8807025 Revision 8, Bypassed and Inoperable Status Indication Logic Input Indications (Letter Item 4)
7. Demarcated Proprietary GA-ESI replacement pages for power supply documentation package 04502050-001 (Letter Item 5)
8. Redacted Non-Proprietary GA-ESI replacement pages for power supply documentation package 04502050-001 (Letter Item 5)
9. Redacted TVA calculation WCGACQ0766, Revision 1, Required Response Spectra for Evaluation of Radiation Monitoring Equipment (Letter Item 6)

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Enclosure 3 TVA Letter Dated March 2, 2012 List of References

1. TVA to NRC letter dated December 22, 2011, Watts Bar Nuclear Plant (WBN) Unit 2 -

Instrumentation and Controls Staff Information Requests (Letter Item 1, SSER 23 Appendix HH Item Number 98)

2. WEC to TVA letter WBT-D-3806, dated February 29, 2012, Response to NRC RAI on Open Item 126 (WINCISE) (Letter Item 2, SSER 24 Appendix HH Item Number 126)
3. TVA to NRC letter dated October 5, 2010, Watts Bar Nuclear Plant (WBN) Unit 2 -

Instrumentation and Controls Staff Information Requests (Letter Item 4)

4. TVA to NRC letter dated January 19, 2012, Watts Bar Nuclear Plant (WBN) Unit 2 -

Instrumentation and Controls Staff Information Requests (Letter Items 5 and 6)

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Enclosure 4 TVA Letter Dated March 2, 2012 New Regulatory Commitment

1. Item 2.h will be addressed by submittal of WNA-VR-00283-WBT-P, Revision7, IV&V Summary Report, which will be submitted within three weeks of receipt from WEC.

(Letter Item 1)

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