L-2005-171, PTN-ENG-SEIJ-04-073, Rev a, Florida Power & Light Co. Proposed License Amendment Support Evaluation of Design Inputs Utilized for Westinghouse Licensing Report

PTN-ENG-SEIJ-04-073, Rev a, Florida Power & Light Co. Proposed License Amendment Support Evaluation of Design Inputs Utilized for Westinghouse Licensing Report

ML052570654
Person / Time
Site:	Turkey Point
Issue date:	12/17/2004
From:	Tomaszewski D Florida Power & Light Co
To:	Office of Nuclear Reactor Regulation
References
L-2005-171 PTN-ENG-SEIJ-04-073, Rev 0
Download: ML052570654 (48)

Text

L-2005-1 71 B Page 3 of 11 PTN-ENG-SEU-04-073, Rev. A Page I of 4 FLORIDA POWER & LIGHT CO.

NUCLEAR ENGINEERING TURKEY POINT UNITS 3 & 4 ENGINEERING EVALUATION FOR PROPOSED LICENSE AMMENDMENT SUPPORT EVALUATION OF DESIGN INPUTS UTILIZED FOR WESTINGHOUSE LICENSING REPORT WNA-LI-00026, SECTION 4.2 PTN-ENG-SEIJ-04-073 REVISION 0 QUALITY RELATED Form 24, Rev 2 (7/97)

L-2005-1 71 B Page 4 of 11 PTN-ENG-SEIJ-04-073, Rev. A Page 2 of 4 REVIE1W AND APPROVAL RECORD PLANT PTN NIJT 3 & 4 TITLE EVALUATION OF DESIGN INPUTS UTILIZED FOR WESTINGHOUSE LICENSING REPORT WNA-LI-00026 SECTION 4.2 LEAD DISCIPLTNh I&C ZNGINlERG ORGAtIZATION0 LIFE CYCLE MANAGEMENT REVIEW/APPROVAL:

INTERFACE TYPE GROUP PRIPARED VERIFIED APPROVED FPL APPROVED' INPur PIVIEV N/A MECS

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OT0ER INTERFACES Fonn 24, Rev 2 (7197)

L-2005-1 71 B Page 5 of 11 PTN-ENG-SEIJ-04-073, Rev. A Page 3 of 4 I.

PURPOSE The purpose of this Engineering Evaluation is to review Design Inputs provided by FP&L in Attachment 1 (Section 4.2 Platform Considerations, portion in bold italics type).

These Design Inputs will be used in support of Reference 1, Westinghouse report WNA-LI-00026 Licensing Support for Deletion of Steam Flow / Feedwater Flow Mismatch Reactor Trip.

This Engineering Evaluation also verifies that the Design Inputs provided comply with the Software Requirements Specification (SPEC-IC-033 Rev. 0) and the Hardware Requirements Specification (SPEC-IC-010 Rev. 3), which are included as References 2 and 3.

1I.

LICENSING REQUIREMENTS None.

III. EVALUATION

1.

Referenced design documents and disposition:

FP&L provided Design Input to the "Platform Considerations" Section 4.2 of Reference 1. The Design Input is depicted in bold italics within the attached Section 4.2. These inputs to Section 4.2 of Reference 1 were verified to comply with Reference 2 (SPEC-IC-033 Revision 0) and Reference 3 (SPEC-IC-010 Revision 3) and provide the basis for this evaluation.

References 2 and 3 have been reviewed and approved by FP&L in accordance with approved procedures.

2.

This Engineering Evaluation was performed using the Platform Considerations identified in the attached Section 4.2 and appropriate sections of approved FP&L Design Specifications, References 2 and 3.

The Attachment 1 Design Inputs are further defined in sub-sections 4.2.1, Median Signal Selection Platform Quality and Reliability; 4.2.2, Median Signal Selection Platform Failure Considerations; and 4.2.3, Median Signal Selection Platform Detection, Indication, and Test.

The Design Input provided in Attachment 1 will be used by Westinghouse for incorporation into their Licensing Support Document, Reference 1.

Form 24, Rev 2 (7/97)

L-2005-171 B Page 6 of 11 PTN-ENG-SEIJ-04-073, Rev. A Page 4 of 4 IV.

CONCLUSION This analysis verifies that the Design Input provided in complies with the applicable requirements of Software Specification SPEC-IC-033, Revision 0 and Hardware Specification SPEC-IC-OlO, Revision 3 (References 2 and 3 inclusive).

V.

VERIFICATION

SUMMARY

This verification assesses the Engineering Evaluation of FP&L design Input to Westinghouse Licensing Report WNA-LI-00026, Section 4.2.

The scope of the verification is to ensure that the evaluation is technically reasonable and its preparation complies with ENG-QI-2.O, "Engineering Evaluations" and ENG-QI-l.7, "Design Input Verification".

The Design Review method was used for this verification, utilizing References 1 through 3 as inputs.

The design verification concludes that this evaluation is reasonable when compared to the inputs.

VI.

REFERENCES

1.

WNA-LI-00026, Licensing Support for Deletion Feedwater Flow Mismatch Reactor Trip, Revision B.

of Steam/

2.

SPEC-IC-033, Feedwater Control System (FWCS)

Software Requirements Specification, Revision 0 (Specifically Section 3.8.7.2: Input Signal Validation.).

3.

SPEC-IC-OlO, Specification for Distributed Control System, Revision 3 (Specifically Sections 2.0 and 4.0 for General and Functional Requirements for DCS.).

VII. AFFECTED DOCUMENTS None.

VIII. ATTACHMENTS

1.

Section 4.2, Platform Considerations.

(5 pages)

Form 24, Rev 2 (7/97)

ATTACHMENT I PTN-ENG"EIJ-04073, REV. 0 PAGE I OF 5 MEDIAN SIGNAL SELECTION FUNCTION CONSIDERATIONS 4.0 OVERVIEW To support the elimination of the adverse control I protection interaction between the main feedwater control system and the lowlow SG water level reactor trip, various aspects of the MSS function are addressed by this report These aspects which are covered In the sections that follow include:

Application Considerations:

1. A demonstration of the functional adequacy of the MSS In preventing the adverse control and protection system Interaction mechanism. This discussion also includes the functional response of the MSS function to a given failure mechanism and configuration certification.

Platform Considerations:

1. A discussion of quality and reliability showing that the function is implemented to support a low failure probability Including the use of components with low failure rates. The discussion addresses the design and Implementation process and operating experience.

2. A discussion regarding potential failure modes that may impact the MSS function including power supply failure, component failure, and communication device failure.

3. Requirements regarding function reliability such as MSS failure detection, Indication, and test capabilities.

4. A discussion of the Median Signal Selector function's ability to withstand faults originating in the control system that could also affect a protection channel.

4.1 APPLICATION CONSIDERATIONS 4.1.1 Median Signal Selection Functional Design & Certification 4.1.1.1 Operational Description The MSS receives three Isolated narrow range level Input signals designated as A, B, and C for each steam generator. The algorithms are configured to select the high value between A and B, B and C, and C and A which are then designated as D, E, and F. Next, the low value between D and E is selected and designated as G. Finally, the low value between G and F is selected. This output value is the median of the three input signals. For example, suppose that A, B, and C are signals representing 30%, 40%, and 50% of steam generator level. After the [high values are selected, L-2005-171 B Page 7 of 11

ATTrACHMENTI1 PTN-ENG-SEIJ.04-073, REV. 0 PAGE 2 OF 6 signals D, E, and F are equal to 40%, 50%, and 50% respectively. Selection of the low value between D and E yields a signal of 40% for G. Finally, the low value between G and F is equal to 40% steam generator level]. This signal representing 40% level is now forwarded to the algorithms for feedwater control. Thus, the MSS will always select the median of three Input signals, land a failure (high or low) of any single Input signal will be rejected by the MSS thereby preventing the failure from causing a control system disturbance, and Initiating a transient which may require protective action.

4.1.1.2 Functional FaultTolerance and Alarming 4.1.1.3 Configuration Certification In order to enhance the reliability of the MSS, a formal activity known as Configuration Certification is undertaken to minimize design errors and provide overall assurance that the specified functional requirements are Implemented In the hardware and software as a system.

Configuration Certification is accomplished via:

L-2005-1 71 B Page 8 of 1 1

ATTACHMENT I PTN-ENG-SEIJ-04-073, REV. 0 PAGE 3 OF 5 4.2 PLATFORM CONSIDERATIONS 4.2.1 Median Signal Selection Quality and Reliability Since the median signal selector function is integral to the basis for steam flowlfeedwater flow trip elimination, continued ability of the function to serve in this role is contingent on its ability to select the median signal. Therefore, steps have been taken to ensure the reliability of the signal selection function. Further, the design provides the capability for complete unit testing that provides unambiguous determination of credible system failures.

For the purpose of increased availability, each system Includes several levels of redundancy and fault tolerant features. Powersupplies are redundant, powering both the Control Processors and iO Modules. The bus between the Control Processor and the IO Modules Is redundant The Control Processors are used In Fault-Tolerant pairs, which seamlessly and bumplessly transfer control to one of the pair, should the other of the pair fail. Redundant I/O modules are used to provide redundant output capability to the final control elements.

4.22 Median Signal Selection Failure Considerations 4.2.2.1 Consequences of Failures The consequences of a failure are minimized by utilizing redundancy in key areas and by predetermining the desired state of device outputs and control actions for credible failures.

Specific actions have been taken to minimize the consequences of a failure as follows:

1. Each steam generator level controller with Its associated I/O modules and power supplies Is physically and functionally Independent from the others.

2. Redundancy Is inherent In the system with fault tolerant control processorpairs and redundant field communications to 1/0 Modules. Failures of any of these redundant components are Identified by the system monitor and are alarmed.

3. When multiple measurements of the same plant parameter are available; they are Input to the system on individual I/O Modules with software algorithms combining the signals. Failure of an input channel on one 10 Module Is accommodated by replacement of the faulted module with no effect on the algorithm's output.

These design features provide further assurance that a component failure will not cause a control system upset. Credible failures of components will not defeat the control and protection system Independence provided by the MSS function.

L-2005-171 B Page 9 of 11

ATTACHMENT I PTN-ENG-SEIJ.04-073, REV. 0 PAGE 4 OF 5 422.2 Duration of Failures The duration of a failure is minimized by the ability to diagnose and repair the system easily and quickly. For example,

a. In the event of a processor failure, the backup processor takes over control and becomes the primary controller, and an alarm Is generated to the system monitor. This transfer of control Is seamless and bumpless. The control function Is unaffected. The transfer Is accomplished automatically within two processing cycles, typically less than one second.

b. The repairmethodologyls to replace the faliedprocessor. This is as simple as removing the failed processor and replacing It with a spare. This processor automatically re-boots upon power-up, and becomes the backup processor after passing the boot-up diagnostics and re-marrying (synchronIzatIon with the primary controller) routines. This reestablishment of the fault-tolerant pair Is seamless and bumpiess. The control function Is unaffected throughout the Initial failure, replacement of the faulted module, and restoration of service.

Time to repair faulted components Is not a significant consideration in overall system performance because of the high reliability of the redundant components and FPL's normal maintenance practices.

The MSS to be installed at Turkey Point is designed to allow for easy detection of system failures through both self diagnostics and periodic test. These methods for failure detection are discussed below.

4.22.3 Diagnostics Self-diagnostics are automatically executed during the normal operation of the system and do not disrupt the real time performance of the process.

a. The system monitor constantly monitors the health and communicatIon among and between Processors and theirrespective I/O modules. A system alarm Is generated should a module fall, a processor fall, any I/O bus fall, or a power supply fall.

b. Deviations between redundant Inputs are detected and alarmed. Redundant sensor algorithms are used to validate important Inputs to the control system.

L-2005-171 B Page 10 of 1 1

ATTACHMENT I PTN-ENG-SEIJ-0473, REV. 0 PAGE5 OF 5 4.22.4 Test Capability The MSS has been provided with the capability for on-line testing, Signal selector testing consists of

[monitoring] the three steam generator level input signals and [the one selected median signal via an engineering display interface. Comparison of the selected median signal to the input signals] will permit determination of whether or not the actual median signal is being chosen, and, consequently.

whether the signal selector is functioning properly.

The MSS can be tested concurrently with the protection system instrument channels which provide Its Inputs. When the Individual instrument channels are placed In the test mode, test signals are received from the protection system, In the same manner as a normal process signal. This configuration ensures that the entire signal path to the signal selector is tested. As the test signal magnitude is varied, that instrument channel which represents the median signal will also be altered allowing the technician to ensure that an improper signal Is not passed through the MSS.

4.2.3 Independence of Safety-Related and Nonsafety-Related Inputs to the Median Signal Selection Function The (existing) 7100 Hagan racks will provide isolated SG level signals to the MSS function. Qualified isolation devices are utilized to prevent a fault in the nonsafety-related feedwater control system from propagating to the safety-related reactor protection system.

L-2005-171 B Page 11 of 11

L-2005-1 71 Page 1 of 31 FPL Letter ENG-LCM-04-251 PTN 3 Desiqn Configuration Documents For Feedwater Control Sensor Segregation December 15. 2004

700 Universe Boulevard 0Juno Beach, FL 33408 FPL ENG-LCM-04-251 December 15, 2004 Mr. P.J. McDonough Customer Projects Manager Westinghouse Electric Company Nuclear Services P.O. Box 355 Pittsburgh, Pennsylvania 15230-0355 USA

Subject:

PTN 3 Design Configuration Documents for Feedwater Control Sensor Segregation

Dear Mr. McDonough:

Attached are Main Steam Isometric Drawings depicting main steam sensing lines and associated flow transmitters post steam generator work per PC/M 94-129. These drawings, as well as the attached P&lDs confirm our position concerning separation between steam flow transmitter sensing lines and steam generator level sensing lines. The drawing numbers are:

5613-P-656-S (sh.1 and 2), 5613-P-657-S (sh.1 and 2), and 5613-P-658-S (sh.1 and 2) respectively for main steam lines/steam generators 'A', 'B' and 'C'. P&lDs include 5613-M-3072, Main Steam System and 5613-M-3074, Feedwater System. Additional verifications were made on the level transmitters utilizing PTN Engineering Walkdown package AFW-3-111-6 for

'3C' Steam Generator, which was provided by PTN Feedwater System Engineer Kevin Peterson on 12-14-04. These documents provide the verifications requested by Vaughn Thomas of your office.

If you have any questions regarding this matter please feel free to contact Warren Busch at 561-691-2963, or Samuel C. Moore at 561-691-2652.

Sincerely, Dan Tomaszewski LCM Project Manager cc: Warren Busch Steve Hetrick Samuel Moore Gary Wood Paul Collette Ralph Cholewinski

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L-2005-1 71 Page 1 of 8 CAW-05-2031 Application for Withholding Proprietary Information From Public Disclosure

• Westinghouse Westinghouse Electric Company Nuclear Services P.O. Box 355 Pittsburgh,Pennsylvania 15230-0355 USA U.S. Nuclear Regulatory Commission Document Control Desk Washington, DC 20555-0001 Directtel: (412) 3744643 Direct fax: (412) 3744011 e-mail: greshajagwestinghouse.com Our ref: CAW-05-203 1 July 20, 2005 APPLICATION FOR WITHHOLDING PROPRIETARY INFORMATION FROM PUBLIC DISCLOSURE

Subject:

"Florida Power & Light Turkey Point Units 3 & 4, Supplemental Licensing Input for Deletion of Steam / Feedwater Flow Mismatch Reactor Trip, WNA-LI-00049-FPL-P, Revision 0, July 2005" (Proprietary)

The proprietary information for which withholding is being requested in the above-referenced report is further identified in Affidavit CAW-05-203 1 signed by the owner of the proprietary information, Westinghouse Electric Company LLC. The affidavit, which accompanies this letter, sets forth the basis on which the information may be withheld from public disclosure by the Commission and addresses with specificity the considerations listed in paragraph (b)(4) of 10 CFR Section 2.390 of the Commission's regulations.

Accordingly, this letter authorizes the utilization of the accompanying affidavit by Florida Power & Light.

Correspondence with respect to the proprietary aspects of the application for withholding or the Westinghouse affidavit should reference this letter, CAW-05-203 1, and should be addressed to J. A. Gresham, Manager, Regulatory Compliance and Plant Licensing, Westinghouse Electric Company LLC, P.O. Box 355, Pittsburgh, Pennsylvania 15230-0355.

Very truly yours, J. A. Gresham, Manager Regulatory Compliance and Plant Licensing Enclosures cc: B. Benney L. Feizollahi A BNFL Group company

CAW-05-203 1 AFFIDAVIT COMMONWEALTH OF PENNSYLVANIA:

ss COUNTY OF ALLEGHENY:

Before me, the undersigned authority, personally appeared J. S. Galembush, who, being by me duly sworn according to law, deposes and says that he is authorized to execute this Affidavit on behalf of Westinghouse Electric Company LLC (Westinghouse), and that the averments of fact set forth in this Affidavit are true and correct to the best of his knowledge, information, and belief:

J. S. Galembush, Customer 1I" Leader Sworn to and subscribed before me this o day of

,O 2005 Notary Public NowSed Shamn L Fol, Notwy PRbM Monvoo~e Boro, Aleqx~ty nMy CTntsslon E#ires Jwy 29,2007 Mentor. Pegmykwia Assodstbn Orfas

2 CAW-05-203 1 (1) 1 am Customer I'" Leader in Nuclear Services, Westinghouse Electric Company LLC (Westinghouse), and as such, I have been specifically delegated the function of reviewing the proprietary information sought to be withheld from public disclosure in connection with nuclear power plant licensing and rule making proceedings, and am authorized to apply for its withholding on behalf of Westinghouse.

(2)

I am making this Affidavit in conformance with the provisions of 10 CFR Section 2.390 of the Commission's regulations and in conjunction with the Westinghouse "Application for Withholding" accompanying this Affidavit.

(3)

I have personal knowledge of the criteria and procedures utilized by Westinghouse in designating information as a trade secret, privileged or as confidential commercial or financial information.

(4)

Pursuant to the provisions of paragraph (b)(4) of Section 2.390 of the Commission's regulations, the following is furnished for consideration by the Commission in determining whether the information sought to be withheld from public disclosure should be withheld.

(i)

The information sought to be withheld from public disclosure is owned and has been held in confidence by Westinghouse.

(ii)

The information is of a type customarily held in confidence by Westinghouse and not customarily disclosed to the public. Westinghouse has a rational basis for determining the types of information customarily held in confidence by it and, in that connection, utilizes a system to determine when and whether to hold certain types of information in confidence. The application of that system and the substance of that system constitutes Westinghouse policy and provides the rational basis required.

Under that system, information is held in confidence if it falls in one or more of several types, the release of which might result in the loss of an existing or potential competitive advantage, as follows:

(a)

The information reveals the distinguishing aspects of a process (or component, structure, tool, method, etc.) where prevention of its use by any of

3 CAW-05-2031 Westinghouse's competitors without license from Westinghouse constitutes a competitive economic advantage over other companies.

(b)

It consists of supporting data, including test data, relative to a process (or component, structure, tool, method, etc.), the application of which data secures a competitive economic advantage, e.g., by optimization or improved marketability.

(c)

Its use by a competitor would reduce his expenditure of resources or improve his competitive position in the design, manufacture, shipment, installation, assurance of quality, or licensing a similar product.

(d)

It reveals cost or price information, production capacities, budget levels, or commercial strategies of Westinghouse, its customers or suppliers.

(e)

It reveals aspects of past, present, or future Westinghouse or customer funded development plans and programs of potential commercial value to Westinghouse.

(f)

It contains patentable ideas, for which patent protection may be desirable.

There are sound policy reasons behind the Westinghouse system which include the following:

(a)

The use of such information by Westinghouse gives Westinghouse a competitive advantage over its competitors. It is, therefore, withheld from disclosure to protect the Westinghouse competitive position.

(b)

It is information that is marketable in many ways. The extent to which such information is available to competitors diminishes the Westinghouse ability to sell products and services involving the use of the information.

(c)

Use by our competitor would put Westinghouse at a competitive disadvantage by reducing his expenditure of resources at our expense.

4 CAW-05-203 1 (d)

Each component of proprietary information pertinent to a particular competitive advantage is potentially as valuable as the total competitive advantage. If competitors acquire components of proprietary information, any one component may be the key to the entire puzzle, thereby depriving Westinghouse of a competitive advantage.

(e)

Unrestricted disclosure would jeopardize the position of prominence of Westinghouse in the world market, and thereby give a market advantage to the competition of those countries.

(f)

The Westinghouse capacity to invest corporate assets in research and development depends upon the success in obtaining and maintaining a competitive advantage.

(iii)

The information is being transmitted to the Commission in confidence and, under the provisions of 10 CIR Section 2.390, it is to be received in confidence by the Commission.

(iv)

The information sought to be protected is not available in public sources or available information has not been previously employed in the same original manner or method to the best of our knowledge and belief.

(v) The proprietary information sought to be withheld in this submittal is that which is appropriately marked in "Florida Power & Light Turkey Point Units 3 & 4, Supplemental Licensing Input for Deletion of Steam / Feedwater Flow Mismatch Reactor Trip, WNA-LI-00049-FPL-P, Revision 0, July 2005," (Proprietary) being transmitted by the Florida Power & Light Company letter and Application for Withholding Proprietary Information from Public Disclosure, to the Document Control Desk. The proprietary information for Turkey Point Units 3 & 4 is expected to be applicable for other licensee submittals in response to certain NRC requirements for justification of steam/feedwater flow mismatch reactor trip elimination.

This information is part of that which will enable Westinghouse to:

5 CAW-05-203 1 (a) Provide an approved, fault tolerant design.

(b) Provide a design configuration that has been certified by an approved process.

(c) Provide basis information for related accident analyses.

Further this information has substantial commercial value as follows:

(a)

Westinghouse plans to sell the use of similar information to its customers for purposes of eliminating the steam/feed flow mismatch reactor trip.

(b)

Westinghouse can sell support and defense of steam/feed flow mismatch reactor trip elimination.

(c)

The information requested to be withheld reveals the distinguishing aspects of a methodology which was developed by Westinghouse.

Public disclosure of this proprietary information is likely to cause substantial harm to the competitive position of Westinghouse because it would enhance the ability of competitors to provide similar design modifications, bases, and licensing defense services for commercial power reactors without commensurate expenses. Also, public disclosure of the information would enable others to use the information to meet NRC requirements for licensing documentation without purchasing the right to use the information.

The development of the technology described in part by the information is the result of applying the results of many years of experience in an intensive Westinghouse effort and the expenditure of a considerable sum of money.

In order for competitors of Westinghouse to duplicate this information, similar technical programs would have to be performed and a significant manpower effort, having the requisite talent and experience, would have to be expended.

Further the deponent sayeth not.

PROPRIETARY INFORMATION NOTICE Transmitted herewith are proprietary and/or non-proprietary versions of documents furnished to the NRC in connection with requests for generic and/or plant-specific review and approval.

In order to conform to the requirements of 10 CFR 2.390 of the Commission's regulations concerning the protection of proprietary information so submitted to the NRC, the information which is proprietary in the proprietary versions is contained within brackets, and where the proprietary information has been deleted in the non-proprietary versions, only the brackets remain (the information that was contained within the brackets in the proprietary versions having been deleted). The justification for claiming the information so designated as proprietary is indicated in both versions by means of lower case letters (a) through (f) located as a superscript immediately following the brackets enclosing each item of information being identified as proprietary or in the margin opposite such information. These lower case letters refer to the types of information Westinghouse customarily holds in confidence identified in Sections (4)(ii)(a) through (4)(ii)(f) of the affidavit accompanying this transmittal pursuant to 10 CFR 2.390(b)(1).

COPYRIGHT NOTICE The reports transmitted herewith each bear a Westinghouse copyright notice. The NRC is permitted to make the number of copies of the information contained in these reports which are necessary for its internal use in connection with generic and plant-specific reviews and approvals as well as the issuance, denial, amendment, transfer, renewal, modification, suspension, revocation, or violation of a license, permit, order, or regulation subject to the requirements of 10 CFR 2.390 regarding restrictions on public disclosure to the extent such information has been identified as proprietary by Westinghouse, copyright protection notwithstanding. With respect to the non-proprietary versions of these reports, the NRC is permitted to make the number of copies beyond those necessary for its internal use which are necessary in order to have one copy available for public viewing in the appropriate docket files in the public document room in Washington, DC and in local public document rooms as may be required by NRC regulations if the number of copies submitted is insufficient for this purpose. Copies made by the NRC must include the copyright notice in all instances and the proprietary notice if the original was identified as proprietary.