ML15121A310: Difference between revisions

From kanterella
Jump to navigation Jump to search
(Created page by program invented by StriderTol)
(Created page by program invented by StriderTol)
Line 21: Line 21:


==SUBJECT:==
==SUBJECT:==
DIABLO CANYON POWER PLANT, UNITS 1 AND 2 -REGULATORY AUDIT PLAN FOR JUNE 22-26, 2015, AUDIT AT WESTINGHOUSE FACILITY IN WARRENDALE, PENNSYLVANIA, IN SUPPORT OF DIGITAL PROCESS PROTECTION SYSTEM REPLACEMENT LICENSE AMENDMENT REQUEST (TAC NOS. ME7522 AND ME7523)  
DIABLO CANYON POWER PLANT, UNITS 1 AND 2 -REGULATORY AUDIT PLAN FOR JUNE 22-26, 2015, AUDIT AT WESTINGHOUSE FACILITY IN WARRENDALE, PENNSYLVANIA, IN SUPPORT OF DIGITAL PROCESS PROTECTION SYSTEM REPLACEMENT LICENSE AMENDMENT REQUEST (TAC NOS. ME7522 AND ME7523)  


==Dear Mr. Halpin:==
==Dear Mr. Halpin:==
By letter dated October 26, 2011, as supplemented by letters dated December 20, 2011; and April 2, April 30, June 6, August 2, September 11, November 27 and December 5, 2012; and March 7, March 25, April 30, May 9, May 30, and September 17, 2013; and April 24 and April 30, 2014; and February 2, 2015 (Agencywide Documents Access and Management System Accession Nos. ML 113070457, ML 113610541, ML 12094A072, ML 12131A513, ML 12170A837, ML 12222A094, ML 12256A308, ML 13004A468, ML 12342A149, ML 13267A129, ML13093A311, ML13121A089, ML13130A059, ML13154A049, ML13261A354, ML14205A031, ML 14121A002, and ML 15062A386, respectively),
By letter dated October 26, 2011, as supplemented by letters dated December 20, 2011; and April 2, April 30, June 6, August 2, September 11, November 27 and December 5, 2012; and March 7, March 25, April 30, May 9, May 30, and September 17, 2013; and April 24 and April 30, 2014; and February 2, 2015 (Agencywide Documents Access and Management System Accession Nos. ML 113070457, ML 113610541, ML 12094A072, ML 12131A513, ML 12170A837, ML 12222A094, ML 12256A308, ML 13004A468, ML 12342A149, ML 13267A129, ML13093A311, ML13121A089, ML13130A059, ML13154A049, ML13261A354, ML14205A031, ML 14121A002, and ML 15062A386, respectively), Pacific Gas and Electric Company requested the U.S. Nuclear Regulatory Commission (NRC) staff's approval of an amendment for the Diablo Canyon Power Plant, Units 1 and 2 (Diablo Canyon). The proposed license amendment request would provide a digital replacement of the Process Protection System portion of the Reactor Trip System and Engineered Safety Features Actuation System at Diablo Canyon. To support its safety evaluation, the NRC Instrumentation and Controls Branch will conduct an audit at the Westinghouse facility in Warrendale, Pennsylvania, during the week of June 22-26, 2015. Enclosed is the plan to support this audit.
Pacific Gas and Electric Company requested the U.S. Nuclear Regulatory Commission (NRC) staff's approval of an amendment for the Diablo Canyon Power Plant, Units 1 and 2 (Diablo Canyon).
The proposed license amendment request would provide a digital replacement of the Process Protection System portion of the Reactor Trip System and Engineered Safety Features Actuation System at Diablo Canyon. To support its safety evaluation, the NRC Instrumentation and Controls Branch will conduct an audit at the Westinghouse facility in Warrendale, Pennsylvania, during the week of June 22-26, 2015. Enclosed is the plan to support this audit.
E. Halpin If you have any questions, please contact me at 301-415-1564 or via e-mail at Siva.Lingam@nrc.gov.
E. Halpin If you have any questions, please contact me at 301-415-1564 or via e-mail at Siva.Lingam@nrc.gov.
Docket Nos. 50-275 and 50-323  
Docket Nos. 50-275 and 50-323  
Line 34: Line 31:


Audit Plan cc w/encl: Distribution via Listserv Sincerely, Siva P. Lingam, Project Manager Plant Licensing Branch IV-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 IN WARRENDALE, PENNSYLVANIA.
Audit Plan cc w/encl: Distribution via Listserv Sincerely, Siva P. Lingam, Project Manager Plant Licensing Branch IV-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 IN WARRENDALE, PENNSYLVANIA.
TO SUPPORT REVIEW OF DIGITAL PROCESS PROTECTION SYSTEM REPLACEMENT LICENSE AMENDMENT REQUEST Background PACIFIC GAS AND ELECTRIC COMPANY DIABLO CANYON POWER PLANT. UNITS 1 AND 2 DOCKET NOS. 50-275 AND 50-323 The U.S. Nuclear Regulatory Commission (NRC) staff is currently engaged in a review of a digital safety system replacement for the Diablo Canyon Power Plant, Units 1 and 2 (Diablo Canyon).
TO SUPPORT REVIEW OF DIGITAL PROCESS PROTECTION SYSTEM REPLACEMENT LICENSE AMENDMENT REQUEST Background PACIFIC GAS AND ELECTRIC COMPANY DIABLO CANYON POWER PLANT. UNITS 1 AND 2 DOCKET NOS. 50-275 AND 50-323 The U.S. Nuclear Regulatory Commission (NRC) staff is currently engaged in a review of a digital safety system replacement for the Diablo Canyon Power Plant, Units 1 and 2 (Diablo Canyon). By letter dated October 26, 2011, Pacific Gas and Electric Company (PG&E, the licensee) submitted license amendment request (LAR) 11-07 to replace the Diablo Canyon Eagle 21 Process Protection System (PPS) with a new digital PPS (Agencywide Documents Access and Management System (ADAMS) Accession No. ML 11307 A457). In addition, the licensee supplemented the LAR by letters dated December 20, 2011, and April 2, April 30, June 6, August 2, September 11, November 27, and December 5, 2012, and March 7, March 25, April 30, May 9, May 30, and September 17, 2013, and April 24 and April 30, 2014, and February 2, 2015 (ADAMS Accession Nos. ML 113610541, ML 12094A072, ML 12131A513, ML 12170A837, ML 12222A094, ML 12256A308, ML 13004A468, ML 12342A149, ML 13267A129, ML13093A311, ML13121A089, ML13130A059, ML13154A049, ML13261A354, ML14205A031, ML 14121A002, and ML 15062A386, respectively).
By letter dated October 26, 2011, Pacific Gas and Electric Company (PG&E, the licensee) submitted license amendment request (LAR) 11-07 to replace the Diablo Canyon Eagle 21 Process Protection System (PPS) with a new digital PPS (Agencywide Documents Access and Management System (ADAMS) Accession No. ML 11307 A457). In addition, the licensee supplemented the LAR by letters dated December 20, 2011, and April 2, April 30, June 6, August 2, September 11, November 27, and December 5, 2012, and March 7, March 25, April 30, May 9, May 30, and September 17, 2013, and April 24 and April 30, 2014, and February 2, 2015 (ADAMS Accession Nos. ML 113610541, ML 12094A072, ML 12131A513, ML 12170A837, ML 12222A094, ML 12256A308, ML 13004A468, ML 12342A149, ML 13267A129, ML13093A311, ML13121A089, ML13130A059, ML13154A049, ML13261A354, ML14205A031, ML 14121A002, and ML 15062A386, respectively).
The LAR requested NRC review and approval of the proposed design. As part of this review, the NRC staff is conducting a regulatory audit of the Advanced Logic System (ALS) portion of the Diablo Canyon PPS (DCPPS) replacement system. In February of 2013, the NRC staff conducted an initial audit of the ALS system development processes in Scottsdale, Arizona (see audit report dated October 8, 2013; ADAMS Accession No. ML 13232A263).
The LAR requested NRC review and approval of the proposed design. As part of this review, the NRC staff is conducting a regulatory audit of the Advanced Logic System (ALS) portion of the Diablo Canyon PPS (DCPPS) replacement system. In February of 2013, the NRC staff conducted an initial audit of the ALS system development processes in Scottsdale, Arizona (see audit report dated October 8, 2013; ADAMS Accession No. ML 13232A263).
During that audit, the NRC staff was unable to observe how the design phase outputs are subject to the Verification and Validation (V&V) processes because the V&V activities had not been completed.
During that audit, the NRC staff was unable to observe how the design phase outputs are subject to the Verification and Validation (V&V) processes because the V&V activities had not been completed.
The NRC staff also identified several open items and noted that a follow-up audit would be necessary to evaluate resolution activities for each of these open items. Regulatory Audit Basis To support its safety evaluation (SE), the NRC Instrumentation and Controls Branch (EICB) will conduct a second audit at the Westinghouse facility in Warrendale, Pennsylvania.
The NRC staff also identified several open items and noted that a follow-up audit would be necessary to evaluate resolution activities for each of these open items. Regulatory Audit Basis To support its safety evaluation (SE), the NRC Instrumentation and Controls Branch (EICB) will conduct a second audit at the Westinghouse facility in Warrendale, Pennsylvania.
The purpose of this confirmatory audit is to determine if the life cycle processes used, and the outputs of those processes have resulted in a PPS system for use at Diablo Canyon, which will meet Enclosure  regulatory requirements.
The purpose of this confirmatory audit is to determine if the life cycle processes used, and the outputs of those processes have resulted in a PPS system for use at Diablo Canyon, which will meet Enclosure  regulatory requirements.
This audit will provide information necessary to complete the NRC staff's evaluation of the proposed ALS portion of the DC PPS. Regulatory Audit Scope The objective of this audit is to verify, via an independent evaluation, the ALS subsystem of the DCPPS conforms to applicable regulations, standards, guidelines, plans, and procedures by assessing the implementation of the systems developmental life cycle process.
This audit will provide information necessary to complete the NRC staff's evaluation of the proposed ALS portion of the DC PPS. Regulatory Audit Scope The objective of this audit is to verify, via an independent evaluation, the ALS subsystem of the DCPPS conforms to applicable regulations, standards, guidelines, plans, and procedures by assessing the implementation of the systems developmental life cycle process. Audit Requirements  
Audit Requirements  
: 1. Threads reviewed during first audit -Several requirement threads were reviewed through the requirements phase during the first ALS audit. The team will select from this list to perform follow-up reviews through the design and implementation phases of PPS system development.
: 1. Threads reviewed during first audit -Several requirement threads were reviewed through the requirements phase during the first ALS audit. The team will select from this list to perform follow-up reviews through the design and implementation phases of PPS system development.
The team intends to trace system requirements to specific test cases to be performed during the Factory Acceptance Test. 2. Additional topic areas to be covered during second audit: a. Time Response  
The team intends to trace system requirements to specific test cases to be performed during the Factory Acceptance Test. 2. Additional topic areas to be covered during second audit: a. Time Response -The NRC will review the relation between the specified time response requirements for PPS and the safety analysis response time assumptions listed in the Updated Final Safety Analysis Report Table 15.1-2. The objective of this audit activity is to understand and confirm how the PPS component of the overall safety system response time assumptions is derived. b. Project Risk Mitigation (SE Section 3.4.1.1) -Westinghouse uses Risk Assessment Worksheet (RAW) to identify risk, problem and mitigation strategies.
-The NRC will review the relation between the specified time response requirements for PPS and the safety analysis response time assumptions listed in the Updated Final Safety Analysis Report Table 15.1-2. The objective of this audit activity is to understand and confirm how the PPS component of the overall safety system response time assumptions is derived.  
: b. Project Risk Mitigation (SE Section 3.4.1.1)  
-Westinghouse uses Risk Assessment Worksheet (RAW) to identify risk, problem and mitigation strategies.
This worksheet is maintained and reviewed periodically by the Project Leadership Team. The NRC staff plans to review RAWs associated with the PPS project to confirm performance of risk mitigation activities.  
This worksheet is maintained and reviewed periodically by the Project Leadership Team. The NRC staff plans to review RAWs associated with the PPS project to confirm performance of risk mitigation activities.  
: c. Configuration Verification (SE Section 3.10.1. 7) -Conduct Audit activity to observe how the Maintenance Workstation/ALS Service Unit (ASU) is used to verify that correct logic implementation is installed into the DCPPS ALS-102 Core Logic boards. Determine if this verification activity can be done with the system operable and if surveillance tests will be performed to periodically verify correct logic implementation.
: c. Configuration Verification (SE Section 3.10.1. 7) -Conduct Audit activity to observe how the Maintenance Workstation/ALS Service Unit (ASU) is used to verify that correct logic implementation is installed into the DCPPS ALS-102 Core Logic boards. Determine if this verification activity can be done with the system operable and if surveillance tests will be performed to periodically verify correct logic implementation.
Determine if accessing the board's Non-Volatile Memory will require connecting the Test ALS Bus (TAB) or if this configuration information can be accessed through the communication channels TxB1, and TxB2 communication links. Review the Configuration Status Accounting document 6116-00050 and verify that the revision number and other identification information is available for each of the configuration items. This audit item is associated with Open Item 109 of the DC PPS Open Item List. d. Redundancy Checker (LAR 4.2.5.2 page 64) -The LAR states that the redundancy checker compares outputs and critical initial states from the two cores and will drive the board to a safe state when the outputs do not agree. The NRC staff plans to audit the requirements associated with defining these states and confirm implementation within the system design. This audit item is associated with Open Item 110 of the DC PPS Open Item List. e. TAB Connection Verification (LAR 4.2.13.5 page 95) -The LAR states that the ASU software ensures that the correct TAB is connected to the respective Electronics Industries Alliance (EIA)-485 port when the TAB is enabled.
Determine if accessing the board's Non-Volatile Memory will require connecting the Test ALS Bus (TAB) or if this configuration information can be accessed through the communication channels TxB1, and TxB2 communication links. Review the Configuration Status Accounting document 6116-00050 and verify that the revision number and other identification information is available for each of the configuration items. This audit item is associated with Open Item 109 of the DC PPS Open Item List. d. Redundancy Checker (LAR 4.2.5.2 page 64) -The LAR states that the redundancy checker compares outputs and critical initial states from the two cores and will drive the board to a safe state when the outputs do not agree. The NRC staff plans to audit the requirements associated with defining these states and confirm implementation within the system design. This audit item is associated with Open Item 110 of the DC PPS Open Item List. e. TAB Connection Verification (LAR 4.2.13.5 page 95) -The LAR states that the ASU software ensures that the correct TAB is connected to the respective Electronics Industries Alliance (EIA)-485 port when the TAB is enabled. The NRC staff plans to review requirements associated with this function and confirm implementation within the ALS system design. f. TAB and TXB Configuration and Communication (LAR 4.2.9 page 74) -Transmit Bus TxB2 transmits data from each ALS chassis "A" and "B" ALS-102 Core Logic Board to the Maintenance Workstation.
The NRC staff plans to review requirements associated with this function and confirm implementation within the ALS system design. f. TAB and TXB Configuration and Communication (LAR 4.2.9 page 74) -Transmit Bus TxB2 transmits data from each ALS chassis "A" and "B" ALS-102 Core Logic Board to the Maintenance Workstation.
Two-way communications are permitted only when the TAB communication link is physically connected between the TAB and the ALS Maintenance Workstation.
Two-way communications are permitted only when the TAB communication link is physically connected between the TAB and the ALS Maintenance Workstation.
The NRC staff plans to review requirements associated with these functions and confirm implementation within the ALS system design. This audit item is associated with Open Items 69, 81, and 106 of the DC PPS Open Item List. g. V&V Activities Associated with "Verification of Diversity"  
The NRC staff plans to review requirements associated with these functions and confirm implementation within the ALS system design. This audit item is associated with Open Items 69, 81, and 106 of the DC PPS Open Item List. g. V&V Activities Associated with "Verification of Diversity" -The NRC staff will audit V&V activities used to ensure that the completed Core A and Core B logic implementations are sufficiently diverse so that logic implementation errors common to both cores will not need to be considered.
-The NRC staff will audit V&V activities used to ensure that the completed Core A and Core B logic implementations are sufficiently diverse so that logic implementation errors common to both cores will not need to be considered.
The audit team plans to evaluate the ALS Platform Field Programmable Gate Array (FPGA) V&V Test Plan, 6002-00018 and the V&V activities prescribed therein to confirm the necessary degree of diversity is achieved.  
The audit team plans to evaluate the ALS Platform Field Programmable Gate Array (FPGA) V&V Test Plan, 6002-00018 and the V&V activities prescribed therein to confirm the necessary degree of diversity is achieved.  
: h. Indication of Channel Bypass Status -This audit item is associated with Open Item 111 of the DCPPS Open Item List. The NRC staff will perform a thread review of requirement R4082 of the FPGA Requirements Specification 6116-10201.
: h. Indication of Channel Bypass Status -This audit item is associated with Open Item 111 of the DCPPS Open Item List. The NRC staff will perform a thread review of requirement R4082 of the FPGA Requirements Specification 6116-10201.
This requirement has been superseded;  
This requirement has been superseded; however, the NRC plans to evaluate how the initiating functional requirement is being satisfied in the completed system design. Additional V&V activity documents will be reviewed as necessary to accomplish the objectives of this audit item. i. Secure Development Environment  
: however, the NRC plans to evaluate how the initiating functional requirement is being satisfied in the completed system design. Additional V&V activity documents will be reviewed as necessary to accomplish the objectives of this audit item. i. Secure Development Environment  
-Verify that the development environment established for the DCPPS development effort conforms to the requirements of Regulatory Guide 1.152, Revision 3. The NRC staff will review the secure development activities by Westinghouse since moving the development environment from Scottsdale, Arizona, to the Warrendale, Pennsylvania, facility. Information Necessary for the Regulatory Audit The following documentation and supporting materials will need to be available for review in the performance of this audit.
-Verify that the development environment established for the DCPPS development effort conforms to the requirements of Regulatory Guide 1.152, Revision  
: 3. The NRC staff will review the secure development activities by Westinghouse since moving the development environment from Scottsdale,  
: Arizona, to the Warrendale, Pennsylvania, facility. Information Necessary for the Regulatory Audit The following documentation and supporting materials will need to be available for review in the performance of this audit.
The NRC requests that these documents be available to the audit team upon arrival at the Westinghouse facility.
The NRC requests that these documents be available to the audit team upon arrival at the Westinghouse facility.
* Configuration Diagrams for the ALS portion of the DCPPS
* Configuration Diagrams for the ALS portion of the DCPPS
Line 80: Line 67:
* John Thorp (301) 415-8508 NRG/Region IV/DRS [Division of Reactor Safety]/EB2  
* John Thorp (301) 415-8508 NRG/Region IV/DRS [Division of Reactor Safety]/EB2  
{Engineering Branch 2]
{Engineering Branch 2]
* Shiattin Maker (817) 200-1507 Logistics The audit will start at 1 :00 p.m. on Monday, June 22, 2015, and conclude on Friday, June 26, 2015, at the Westinghouse offices in Warrendale, Pennsylvania. Our tentative schedule for the audit is as follows:
* Shiattin Maker (817) 200-1507 Logistics The audit will start at 1 :00 p.m. on Monday, June 22, 2015, and conclude on Friday, June 26, 2015, at the Westinghouse offices in Warrendale, Pennsylvania. Our tentative schedule for the audit is as follows: Date Time Audit Activity Lead Monday 1 :00 p.m. Entrance meeting Stattel
Date Time Audit Activity Lead Monday 1 :00 p.m. Entrance meeting Stattel
* Introductions
* Introductions
* Discuss purpose & objectives of audit
* Discuss purpose & objectives of audit
* Westinghouse staff to provide overview of Warrendale PPS Project & facility.
* Westinghouse staff to provide overview of Warrendale PPS Project & facility.
2:00 p.m. Review Results of first audit in Scottsdale and Open Alvarado Items identified during that audit with PG&E and Westinghouse.
2:00 p.m. Review Results of first audit in Scottsdale and Open Alvarado Items identified during that audit with PG&E and Westinghouse.
Discuss CS Innovations, LLC (CSI), a Westinghouse Electric  
Discuss CS Innovations, LLC (CSI), a Westinghouse Electric Company, procedures superseded by Westinghouse.
: Company, procedures superseded by Westinghouse.
3:00 p.m. Perform follow-up actions associated with the NRC requirement threads evaluated during previous audit. Review Secure Development Environment Darbali documentation.
3:00 p.m. Perform follow-up actions associated with the NRC requirement threads evaluated during previous audit. Review Secure Development Environment Darbali documentation.
5:00 p.m. Adjourn Tuesday 9:00 a.m. Morning meeting between NRC staff and Westinghouse to discuss activities and logistics for the day. 9:30 a.m. Review of PPS documentation I Conduct interviews NRC with key Westinghouse personnel.
5:00 p.m. Adjourn Tuesday 9:00 a.m. Morning meeting between NRC staff and Westinghouse to discuss activities and logistics for the day. 9:30 a.m. Review of PPS documentation I Conduct interviews NRC with key Westinghouse personnel.
Line 98: Line 83:
NRC 3:00 p.m. NRC staff internal meeting -identification I resolution of NRC any open items. Friday 9:00 a.m. NRC Staff Internal Meeting -Preparation for Exit NRC 10:00 a.m. Exit meeting -NRC staff -provide general overview of All observations  
NRC 3:00 p.m. NRC staff internal meeting -identification I resolution of NRC any open items. Friday 9:00 a.m. NRC Staff Internal Meeting -Preparation for Exit NRC 10:00 a.m. Exit meeting -NRC staff -provide general overview of All observations  
& identification of any open items. 11 :00 a.m. Adjourn Deliverables At the conclusion of the audit, the NRC staff will conduct an exit briefing and will provide a summary of audit results in each subject area defined in the audit scope. The NRC Regulatory Audit Report will be issued by August 10, 2015. References Licensee Documentation:
& identification of any open items. 11 :00 a.m. Adjourn Deliverables At the conclusion of the audit, the NRC staff will conduct an exit briefing and will provide a summary of audit results in each subject area defined in the audit scope. The NRC Regulatory Audit Report will be issued by August 10, 2015. References Licensee Documentation:
* Westinghouse Electric Company LLC, 6002-00301-NP-A, Revision 4, "Advanced Logic System Topical Report and Safety Evaluation,"
* Westinghouse Electric Company LLC, 6002-00301-NP-A, Revision 4, "Advanced Logic System Topical Report and Safety Evaluation," September 2013 (ADAMS Accession No. ML 13298A094).
September 2013 (ADAMS Accession No. ML 13298A094).
* Pacific Gas & Electric, "Diablo Canyon Units 1 and 2, License Amendment Request 11-07 Process Protection System Replacement," dated October 26, 2011 (ADAMS package Accession No. ML 113070457).
* Pacific Gas & Electric, "Diablo Canyon Units 1 and 2, License Amendment Request 11-07 Process Protection System Replacement,"
* Pacific Gas & Electric Company, "Process Protection System Replacement Diversity  
dated October 26, 2011 (ADAMS package Accession No. ML 113070457).
* Pacific Gas & Electric  
: Company, "Process Protection System Replacement Diversity  
& Defense-in-Depth Assessment Topical Report, Revision 1," August 201 O (ADAMS package Accession No. ML 102580728).
& Defense-in-Depth Assessment Topical Report, Revision 1," August 201 O (ADAMS package Accession No. ML 102580728).
* Pacific Gas & Electric  
* Pacific Gas & Electric Company, "Process Protection System (PPS( Replacement System Quality Assurance Plan (SyQAP), Revision 1," March 2013 (ADAMS Accession No. ML13130A059).
: Company, "Process Protection System (PPS( Replacement System Quality Assurance Plan (SyQAP),
* Pacific Gas & Electric Company, "Process Protection System (PPS) Replacement System Verification and Validation Plan (SyVVP), Revision 1," February 2013 (ADAMS Accession No. ML 13093A312).
Revision 1," March 2013 (ADAMS Accession No. ML13130A059).
* Pacific Gas & Electric Company, "Process Protection System Replacement, SCM 36-01 Software Configuration Management Plan (SCMP), Revision 1," May 2013 (ADAMS Accession No. ML 13154A047).
* Pacific Gas & Electric  
* Pacific Gas & Electric Company, "Security Related Information to Support Process Protection System Replacement License Amendment Request 11-07" (security-related Enclosure to PG&E Letter DCL-11-123 dated December 20, 2011; ADAMS Accession No. ML 113610541). NRC Guidance:
: Company, "Process Protection System (PPS) Replacement System Verification and Validation Plan (SyVVP),
Revision 1," February 2013 (ADAMS Accession No. ML 13093A312).
* Pacific Gas & Electric  
: Company, "Process Protection System Replacement, SCM 36-01 Software Configuration Management Plan (SCMP), Revision 1," May 2013 (ADAMS Accession No. ML 13154A047).
* Pacific Gas & Electric  
: Company, "Security Related Information to Support Process Protection System Replacement License Amendment Request 11-07" (security-related Enclosure to PG&E Letter DCL-11-123 dated December 20, 2011; ADAMS Accession No. ML 113610541). NRC Guidance:
* U.S. Nuclear Regulatory Commission, NUREG-0800, "Standard Review Plan for the Review of Safety Analysis Reports for Nuclear Power Plants: LWR Edition" (SRP), Chapter 7, "Instrumentation and Controls."
* U.S. Nuclear Regulatory Commission, NUREG-0800, "Standard Review Plan for the Review of Safety Analysis Reports for Nuclear Power Plants: LWR Edition" (SRP), Chapter 7, "Instrumentation and Controls."
* U.S. Nuclear Regulatory Commission, Regulatory Guide 1.152, Revision 3, "Criteria for Use of Computers in Safety Systems of Nuclear Power Plants,"
* U.S. Nuclear Regulatory Commission, Regulatory Guide 1.152, Revision 3, "Criteria for Use of Computers in Safety Systems of Nuclear Power Plants," July 2011 (ADAMS Accession No. ML 102870022).
July 2011 (ADAMS Accession No. ML 102870022).
* U.S. Nuclear Regulatory Commission, Regulatory Guide 1.153, Revision 1, "Criteria for Safety Systems," June 1996 (ADAMS Accession No. ML003740022).
* U.S. Nuclear Regulatory Commission, Regulatory Guide 1.153, Revision 1, "Criteria for Safety Systems,"
* U.S. Nuclear Regulatory Commission, Regulatory Guide 1.168, Revision 1, "Verification, Validation, Reviews, and Audits for Digital Computer Software Used in Safety Systems of Nuclear Power Plants," February 2004 (ADAMS Accession No. ML040410189).
June 1996 (ADAMS Accession No. ML003740022).
* U.S. Nuclear Regulatory Commission, Regulatory Guide 1.169, "Configuration Management Plans for Digital Computer Software Used in Safety Systems of Nuclear Power Plants," September 1997 (ADAMS Accession No. ML003740102).
* U.S. Nuclear Regulatory Commission, Regulatory Guide 1.168, Revision 1, "Verification, Validation,  
* U.S. Nuclear Regulatory Commission, Regulatory Guide 1.173, "Developing Software Life Cycle Processes for Digital Computer Software Used in Safety Systems of Nuclear Power Plants," September 1997 (ADAMS Accession No. ML003740101).
: Reviews, and Audits for Digital Computer Software Used in Safety Systems of Nuclear Power Plants,"
* U.S. Nuclear Regulatory Commission, Regulatory Guide 5.71, "Cyber Security Programs for Nuclear Facilities," January 2010 (ADAMS Accession No. ML090340159).
February 2004 (ADAMS Accession No. ML040410189).
* Nuclear Energy Institute, NEI 08-09, Revision 6, "Cyber Security Plan for Nuclear Power Reactors," April 2010 (security-related).
* U.S. Nuclear Regulatory Commission, Regulatory Guide 1.169, "Configuration Management Plans for Digital Computer Software Used in Safety Systems of Nuclear Power Plants,"
September 1997 (ADAMS Accession No. ML003740102).
* U.S. Nuclear Regulatory Commission, Regulatory Guide 1.173, "Developing Software Life Cycle Processes for Digital Computer Software Used in Safety Systems of Nuclear Power Plants,"
September 1997 (ADAMS Accession No. ML003740101).
* U.S. Nuclear Regulatory Commission, Regulatory Guide 5.71, "Cyber Security Programs for Nuclear Facilities,"
January 2010 (ADAMS Accession No. ML090340159).
* Nuclear Energy Institute, NEI 08-09, Revision 6, "Cyber Security Plan for Nuclear Power Reactors,"
April 2010 (security-related).
Industry Standards:
Industry Standards:
* Institute of Electrical and Electronics Engineers Standard 7-4.3.2-2003, "IEEE Standard Criteria for Digital Computers in Safety Systems of Nuclear Power Generating Stations."
* Institute of Electrical and Electronics Engineers Standard 7-4.3.2-2003, "IEEE Standard Criteria for Digital Computers in Safety Systems of Nuclear Power Generating Stations."
Line 147: Line 115:


Audit Plan cc w/encl: Distribution via Listserv DISTRIBUTION:
Audit Plan cc w/encl: Distribution via Listserv DISTRIBUTION:
PUBLIC LPL4-1 R/F RidsAcrsAcnw_MailCTR Resource RidsNrrDeEicb Resource RidsNrrDorllpl4-1 Resource RidsNrrLAJBurkhardt Resource RidsNrrPMDiabloCanyon Resource RidsRgn4MailCenter Resource  
PUBLIC LPL4-1 R/F RidsAcrsAcnw_MailCTR Resource RidsNrrDeEicb Resource RidsNrrDorllpl4-1 Resource RidsNrrLAJBurkhardt Resource RidsNrrPMDiabloCanyon Resource RidsRgn4MailCenter Resource RStattel, NRR/DE/EICB RAlvarado, NRR/DE/EICB SMakor, RIV/DRS/EB2 SDarbali, NRR/DE/EICB ADAMS A ccess1on N o.: ML 15121A310 OFFICE NRR/DORL/LPL4-1  
: RStattel, NRR/DE/EICB RAlvarado, NRR/DE/EICB SMakor, RIV/DRS/EB2  
: SDarbali, NRR/DE/EICB ADAMS A ccess1on N o.: ML 15121A310 OFFICE NRR/DORL/LPL4-1  
/PM NRR/DORL/LPL4-1  
/PM NRR/DORL/LPL4-1  
/LA NAME Slingam JBurkhardt DATE 5/4/15 5/4/15 Sincerely, IRA/ Siva P. Lingam, Project Manager Plant Licensing Branch IV-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation  
/LA NAME Slingam JBurkhardt DATE 5/4/15 5/4/15 Sincerely, IRA/ Siva P. Lingam, Project Manager Plant Licensing Branch IV-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation  

Revision as of 03:46, 9 July 2018

Diablo Canyon, Units 1 and 2 - Regulatory Audit Plan for June 8-12, 2015 Audit at the Westinghouse Facility in Warrendale, PA, to Support Digital Replacement of Process Protection System License Amendment Request (TAC ME7522-ME7523)
ML15121A310
Person / Time
Site: Diablo Canyon  Pacific Gas & Electric icon.png
Issue date: 05/15/2015
From: Lingam S P
Plant Licensing Branch IV
To: Halpin E D
Pacific Gas & Electric Co
Lingam S P
References
TAC ME7522, TAC ME7523
Download: ML15121A310 (11)
v • d • e


Text

UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 Mr. Edward D. Halpin Senior Vice President and Chief Nuclear Officer Pacific Gas and Electric Company Diablo Canyon Power Plant P.O. Box 56, Mail Code 104/6 Avila Beach, CA 93424 May 15, 2015

SUBJECT:

DIABLO CANYON POWER PLANT, UNITS 1 AND 2 -REGULATORY AUDIT PLAN FOR JUNE 22-26, 2015, AUDIT AT WESTINGHOUSE FACILITY IN WARRENDALE, PENNSYLVANIA, IN SUPPORT OF DIGITAL PROCESS PROTECTION SYSTEM REPLACEMENT LICENSE AMENDMENT REQUEST (TAC NOS. ME7522 AND ME7523)

Dear Mr. Halpin:

By letter dated October 26, 2011, as supplemented by letters dated December 20, 2011; and April 2, April 30, June 6, August 2, September 11, November 27 and December 5, 2012; and March 7, March 25, April 30, May 9, May 30, and September 17, 2013; and April 24 and April 30, 2014; and February 2, 2015 (Agencywide Documents Access and Management System Accession Nos. ML 113070457, ML 113610541, ML 12094A072, ML 12131A513, ML 12170A837, ML 12222A094, ML 12256A308, ML 13004A468, ML 12342A149, ML 13267A129, ML13093A311, ML13121A089, ML13130A059, ML13154A049, ML13261A354, ML14205A031, ML 14121A002, and ML 15062A386, respectively), Pacific Gas and Electric Company requested the U.S. Nuclear Regulatory Commission (NRC) staff's approval of an amendment for the Diablo Canyon Power Plant, Units 1 and 2 (Diablo Canyon). The proposed license amendment request would provide a digital replacement of the Process Protection System portion of the Reactor Trip System and Engineered Safety Features Actuation System at Diablo Canyon. To support its safety evaluation, the NRC Instrumentation and Controls Branch will conduct an audit at the Westinghouse facility in Warrendale, Pennsylvania, during the week of June 22-26, 2015. Enclosed is the plan to support this audit.

E. Halpin If you have any questions, please contact me at 301-415-1564 or via e-mail at Siva.Lingam@nrc.gov.

Docket Nos. 50-275 and 50-323

Enclosure:

Audit Plan cc w/encl: Distribution via Listserv Sincerely, Siva P. Lingam, Project Manager Plant Licensing Branch IV-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 IN WARRENDALE, PENNSYLVANIA.

TO SUPPORT REVIEW OF DIGITAL PROCESS PROTECTION SYSTEM REPLACEMENT LICENSE AMENDMENT REQUEST Background PACIFIC GAS AND ELECTRIC COMPANY DIABLO CANYON POWER PLANT. UNITS 1 AND 2 DOCKET NOS. 50-275 AND 50-323 The U.S. Nuclear Regulatory Commission (NRC) staff is currently engaged in a review of a digital safety system replacement for the Diablo Canyon Power Plant, Units 1 and 2 (Diablo Canyon). By letter dated October 26, 2011, Pacific Gas and Electric Company (PG&E, the licensee) submitted license amendment request (LAR) 11-07 to replace the Diablo Canyon Eagle 21 Process Protection System (PPS) with a new digital PPS (Agencywide Documents Access and Management System (ADAMS) Accession No. ML 11307 A457). In addition, the licensee supplemented the LAR by letters dated December 20, 2011, and April 2, April 30, June 6, August 2, September 11, November 27, and December 5, 2012, and March 7, March 25, April 30, May 9, May 30, and September 17, 2013, and April 24 and April 30, 2014, and February 2, 2015 (ADAMS Accession Nos. ML 113610541, ML 12094A072, ML 12131A513, ML 12170A837, ML 12222A094, ML 12256A308, ML 13004A468, ML 12342A149, ML 13267A129, ML13093A311, ML13121A089, ML13130A059, ML13154A049, ML13261A354, ML14205A031, ML 14121A002, and ML 15062A386, respectively).

The LAR requested NRC review and approval of the proposed design. As part of this review, the NRC staff is conducting a regulatory audit of the Advanced Logic System (ALS) portion of the Diablo Canyon PPS (DCPPS) replacement system. In February of 2013, the NRC staff conducted an initial audit of the ALS system development processes in Scottsdale, Arizona (see audit report dated October 8, 2013; ADAMS Accession No. ML 13232A263).

During that audit, the NRC staff was unable to observe how the design phase outputs are subject to the Verification and Validation (V&V) processes because the V&V activities had not been completed.

The NRC staff also identified several open items and noted that a follow-up audit would be necessary to evaluate resolution activities for each of these open items. Regulatory Audit Basis To support its safety evaluation (SE), the NRC Instrumentation and Controls Branch (EICB) will conduct a second audit at the Westinghouse facility in Warrendale, Pennsylvania.

The purpose of this confirmatory audit is to determine if the life cycle processes used, and the outputs of those processes have resulted in a PPS system for use at Diablo Canyon, which will meet Enclosure regulatory requirements.

This audit will provide information necessary to complete the NRC staff's evaluation of the proposed ALS portion of the DC PPS. Regulatory Audit Scope The objective of this audit is to verify, via an independent evaluation, the ALS subsystem of the DCPPS conforms to applicable regulations, standards, guidelines, plans, and procedures by assessing the implementation of the systems developmental life cycle process. Audit Requirements

1. Threads reviewed during first audit -Several requirement threads were reviewed through the requirements phase during the first ALS audit. The team will select from this list to perform follow-up reviews through the design and implementation phases of PPS system development.

The team intends to trace system requirements to specific test cases to be performed during the Factory Acceptance Test. 2. Additional topic areas to be covered during second audit: a. Time Response -The NRC will review the relation between the specified time response requirements for PPS and the safety analysis response time assumptions listed in the Updated Final Safety Analysis Report Table 15.1-2. The objective of this audit activity is to understand and confirm how the PPS component of the overall safety system response time assumptions is derived. b. Project Risk Mitigation (SE Section 3.4.1.1) -Westinghouse uses Risk Assessment Worksheet (RAW) to identify risk, problem and mitigation strategies.

This worksheet is maintained and reviewed periodically by the Project Leadership Team. The NRC staff plans to review RAWs associated with the PPS project to confirm performance of risk mitigation activities.

c. Configuration Verification (SE Section 3.10.1. 7) -Conduct Audit activity to observe how the Maintenance Workstation/ALS Service Unit (ASU) is used to verify that correct logic implementation is installed into the DCPPS ALS-102 Core Logic boards. Determine if this verification activity can be done with the system operable and if surveillance tests will be performed to periodically verify correct logic implementation.

Determine if accessing the board's Non-Volatile Memory will require connecting the Test ALS Bus (TAB) or if this configuration information can be accessed through the communication channels TxB1, and TxB2 communication links. Review the Configuration Status Accounting document 6116-00050 and verify that the revision number and other identification information is available for each of the configuration items. This audit item is associated with Open Item 109 of the DC PPS Open Item List. d. Redundancy Checker (LAR 4.2.5.2 page 64) -The LAR states that the redundancy checker compares outputs and critical initial states from the two cores and will drive the board to a safe state when the outputs do not agree. The NRC staff plans to audit the requirements associated with defining these states and confirm implementation within the system design. This audit item is associated with Open Item 110 of the DC PPS Open Item List. e. TAB Connection Verification (LAR 4.2.13.5 page 95) -The LAR states that the ASU software ensures that the correct TAB is connected to the respective Electronics Industries Alliance (EIA)-485 port when the TAB is enabled. The NRC staff plans to review requirements associated with this function and confirm implementation within the ALS system design. f. TAB and TXB Configuration and Communication (LAR 4.2.9 page 74) -Transmit Bus TxB2 transmits data from each ALS chassis "A" and "B" ALS-102 Core Logic Board to the Maintenance Workstation.

Two-way communications are permitted only when the TAB communication link is physically connected between the TAB and the ALS Maintenance Workstation.

The NRC staff plans to review requirements associated with these functions and confirm implementation within the ALS system design. This audit item is associated with Open Items 69, 81, and 106 of the DC PPS Open Item List. g. V&V Activities Associated with "Verification of Diversity" -The NRC staff will audit V&V activities used to ensure that the completed Core A and Core B logic implementations are sufficiently diverse so that logic implementation errors common to both cores will not need to be considered.

The audit team plans to evaluate the ALS Platform Field Programmable Gate Array (FPGA) V&V Test Plan, 6002-00018 and the V&V activities prescribed therein to confirm the necessary degree of diversity is achieved.

h. Indication of Channel Bypass Status -This audit item is associated with Open Item 111 of the DCPPS Open Item List. The NRC staff will perform a thread review of requirement R4082 of the FPGA Requirements Specification 6116-10201.

This requirement has been superseded; however, the NRC plans to evaluate how the initiating functional requirement is being satisfied in the completed system design. Additional V&V activity documents will be reviewed as necessary to accomplish the objectives of this audit item. i. Secure Development Environment

-Verify that the development environment established for the DCPPS development effort conforms to the requirements of Regulatory Guide 1.152, Revision 3. The NRC staff will review the secure development activities by Westinghouse since moving the development environment from Scottsdale, Arizona, to the Warrendale, Pennsylvania, facility. Information Necessary for the Regulatory Audit The following documentation and supporting materials will need to be available for review in the performance of this audit.

The NRC requests that these documents be available to the audit team upon arrival at the Westinghouse facility.

  • Configuration Diagrams for the ALS portion of the DCPPS
  • PPS Architecture drawings as required to demonstrate required functionality
  • Diablo Canyon FPGA Requirements Specification 6116-10201
  • Diablo Canyon Core A and Core B FPGA Design Specifications (6116-10203 and 6116-10204)
  • Current DCPPS Requirements Traceability Matrix 6116-00059
  • Configuration Status Accounting, 6116-00050, Rev. X (most current)
  • DCPPS Configuration Management Report, 6116-00400, Rev. X (most current)
  • DCPPS Secure Development Environment Vulnerability Assessment, Rev. X (most current)
  • IOI Requirements, WNA-PS-02884-GEN
  • IOI Assessment, WNA-CS-00117-GEN The audit staff also requests access to the current Project Traceability Matrix information in order to observe that applicable functional requirements are correctly implemented in the PPS. Team Assignments I Resource Estimates The resource estimate for this audit visit is approximately 200 hours0.00231 days <br />0.0556 hours <br />3.306878e-4 weeks <br />7.61e-5 months <br /> of direct review activity.

The NRC staff performing this audit will be: NRC/NRR [Office of Nuclear Reactor Regulation]/DE

[Division of Engineering]/EICB

  • John Thorp (301) 415-8508 NRG/Region IV/DRS [Division of Reactor Safety]/EB2

{Engineering Branch 2]

  • Shiattin Maker (817) 200-1507 Logistics The audit will start at 1 :00 p.m. on Monday, June 22, 2015, and conclude on Friday, June 26, 2015, at the Westinghouse offices in Warrendale, Pennsylvania. Our tentative schedule for the audit is as follows: Date Time Audit Activity Lead Monday 1 :00 p.m. Entrance meeting Stattel
  • Introductions
  • Discuss purpose & objectives of audit
  • Westinghouse staff to provide overview of Warrendale PPS Project & facility.

2:00 p.m. Review Results of first audit in Scottsdale and Open Alvarado Items identified during that audit with PG&E and Westinghouse.

Discuss CS Innovations, LLC (CSI), a Westinghouse Electric Company, procedures superseded by Westinghouse.

3:00 p.m. Perform follow-up actions associated with the NRC requirement threads evaluated during previous audit. Review Secure Development Environment Darbali documentation.

5:00 p.m. Adjourn Tuesday 9:00 a.m. Morning meeting between NRC staff and Westinghouse to discuss activities and logistics for the day. 9:30 a.m. Review of PPS documentation I Conduct interviews NRC with key Westinghouse personnel.

Observe Secure Development Environment and Configuration Darbali Management features of the facility.

2:00 p.m. Discuss Preliminary Inspection Items List with Licensee Stattel 4:00 p.m. Discuss software planning documents.

Alvarado 5:00 p.m. Adjourn Wednesday 9:00 a.m. Morning meeting between NRC staff and Westinghouse to discuss activities and logistics for the day. 9:30 a.m. Discuss ALS system communication and Interim Staff NRC Guidance (ISG)-04 compliance.

Observe Configuration Verification features of the ALS Maintenance Work Station (MWS)/ASU.

2:00 p.m. Review status of Equipment Qualification (EQ) Stattel evaluations.

5:00 p.m. Adjourn Thursday 9:00 a.m. Morning meeting between NRC staff and Westinghouse to discuss activities and logistics for the day. 9:30 a.m. Perform audit review activities.

NRC 3:00 p.m. NRC staff internal meeting -identification I resolution of NRC any open items. Friday 9:00 a.m. NRC Staff Internal Meeting -Preparation for Exit NRC 10:00 a.m. Exit meeting -NRC staff -provide general overview of All observations

& identification of any open items. 11 :00 a.m. Adjourn Deliverables At the conclusion of the audit, the NRC staff will conduct an exit briefing and will provide a summary of audit results in each subject area defined in the audit scope. The NRC Regulatory Audit Report will be issued by August 10, 2015. References Licensee Documentation:

  • Westinghouse Electric Company LLC, 6002-00301-NP-A, Revision 4, "Advanced Logic System Topical Report and Safety Evaluation," September 2013 (ADAMS Accession No. ML 13298A094).
  • Pacific Gas & Electric, "Diablo Canyon Units 1 and 2, License Amendment Request 11-07 Process Protection System Replacement," dated October 26, 2011 (ADAMS package Accession No. ML 113070457).
  • Pacific Gas & Electric Company, "Process Protection System Replacement Diversity

& Defense-in-Depth Assessment Topical Report, Revision 1," August 201 O (ADAMS package Accession No. ML 102580728).

  • Pacific Gas & Electric Company, "Process Protection System (PPS( Replacement System Quality Assurance Plan (SyQAP), Revision 1," March 2013 (ADAMS Accession No. ML13130A059).
  • Pacific Gas & Electric Company, "Process Protection System (PPS) Replacement System Verification and Validation Plan (SyVVP), Revision 1," February 2013 (ADAMS Accession No. ML 13093A312).
  • Pacific Gas & Electric Company, "Process Protection System Replacement, SCM 36-01 Software Configuration Management Plan (SCMP), Revision 1," May 2013 (ADAMS Accession No. ML 13154A047).
  • Pacific Gas & Electric Company, "Security Related Information to Support Process Protection System Replacement License Amendment Request 11-07" (security-related Enclosure to PG&E Letter DCL-11-123 dated December 20, 2011; ADAMS Accession No. ML 113610541). NRC Guidance:
  • U.S. Nuclear Regulatory Commission, NUREG-0800, "Standard Review Plan for the Review of Safety Analysis Reports for Nuclear Power Plants: LWR Edition" (SRP), Chapter 7, "Instrumentation and Controls."
  • U.S. Nuclear Regulatory Commission, Regulatory Guide 1.168, Revision 1, "Verification, Validation, Reviews, and Audits for Digital Computer Software Used in Safety Systems of Nuclear Power Plants," February 2004 (ADAMS Accession No. ML040410189).
  • U.S. Nuclear Regulatory Commission, Regulatory Guide 1.169, "Configuration Management Plans for Digital Computer Software Used in Safety Systems of Nuclear Power Plants," September 1997 (ADAMS Accession No. ML003740102).
  • U.S. Nuclear Regulatory Commission, Regulatory Guide 1.173, "Developing Software Life Cycle Processes for Digital Computer Software Used in Safety Systems of Nuclear Power Plants," September 1997 (ADAMS Accession No. ML003740101).
  • Nuclear Energy Institute, NEI 08-09, Revision 6, "Cyber Security Plan for Nuclear Power Reactors," April 2010 (security-related).

Industry Standards:

  • Institute of Electrical and Electronics Engineers Standard 7-4.3.2-2003, "IEEE Standard Criteria for Digital Computers in Safety Systems of Nuclear Power Generating Stations."
  • American National Standards Institute/Institute of Electrical and Electronics Engineers Standard 1008-1987, "IEEE Standard for Software Unit Testing."
  • Institute of Electrical and Electronics Engineers Standard 1012-1998, "IEEE Standard for Software Verification and Validation."
  • Institute of Electrical and Electronics Engineers Standard 1028-1997, "IEEE Standard for Software Reviews and Audits."
  • American National Standards Institute/Institute of Electrical and Electronics Engineers Standard 1042-1987, "IEEE Guide to Software Configuration Management."
  • Institute of Electrical and Electronics Engineers Standard 1074-1995, "IEEE Standard for Developing Software Life Cycle Processes."

E. Halpin If you have any questions, please contact me at 301-415-1564 or via e-mail at Siva.Lingam@nrc.gov.

Docket Nos. 50-275 and 50-323

Enclosure:

Audit Plan cc w/encl: Distribution via Listserv DISTRIBUTION:

PUBLIC LPL4-1 R/F RidsAcrsAcnw_MailCTR Resource RidsNrrDeEicb Resource RidsNrrDorllpl4-1 Resource RidsNrrLAJBurkhardt Resource RidsNrrPMDiabloCanyon Resource RidsRgn4MailCenter Resource RStattel, NRR/DE/EICB RAlvarado, NRR/DE/EICB SMakor, RIV/DRS/EB2 SDarbali, NRR/DE/EICB ADAMS A ccess1on N o.: ML 15121A310 OFFICE NRR/DORL/LPL4-1

/PM NRR/DORL/LPL4-1

/LA NAME Slingam JBurkhardt DATE 5/4/15 5/4/15 Sincerely, IRA/ Siva P. Lingam, Project Manager Plant Licensing Branch IV-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation

  • b d 1y memoran um NRR/DE/EICB/BC*

N RR/DORL/LPL4-1

/BC NRR/DORL/LPL4-1

/PM JThorp MMarkley Slingam 4/2/15 5/15/15 5/15/15 OFFICIAL RECORD COPY

Retrieved from "https://kanterella.com/w/index.php?title=ML15121A310&oldid=862067"