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{{Adams
#REDIRECT [[3F0811-02, Response to Request for Additional Information to Support NRC Balance of Plant Branch Acceptance Review of the CR-3 Extended Power Uprate LAR]]
| number = ML11228A032
| issue date = 08/11/2011
| title = Response to Request for Additional Information to Support NRC Balance of Plant Branch Acceptance Review of the CR-3 Extended Power Uprate LAR
| author name = Franke J
| author affiliation = Progress Energy Florida, Inc
| addressee name =
| addressee affiliation = NRC/Document Control Desk, NRC/NRR
| docket = 05000302
| license number = DPR-072
| contact person =
| case reference number = 3F0811-02, TAC ME6527
| document type = Letter
| page count = 59
| project = TAC:ME6527
| stage = Response to RAI
}}
 
=Text=
{{#Wiki_filter:Progress Erm Crystal River Nuclear Plant Docket No. 50-302 Operating License No. DPR-72 August 11, 2011 3F0811-02 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001
 
==Subject:==
Crystal River Unit 3 - Response to Request for Additional Information to Support NRC Balance of Plant Branch Acceptance Review of the CR-3 Extended Power Uprate LAR (TAC No. ME6527)
 
==References:==
: 1. CR-3 to NRC letter dated June 15, 2011, "Crystal River Unit 3 - License Amendment Request #309, Revision 0, Extended Power Uprate" (Accession No. ML112070659)
: 2. Email from S. Lingam (NRC) to D. Westcott (CR-3) dated, July 25, 2011, "Crystal River, unit 3 - EPU LAR (ME6527)"
 
==Dear Sir:==
 
By letter dated June 15, 2011, Florida Power Corporation (FPC), doing business as Progress Energy Florida, Inc., requested a license amendment to increase the rated thermal power level of Crystal River Unit 3 (CR-3) from 2609 megawatts (MWt) to 3014 MWt. The proposed license amendment is considered an Extended Power Uprate (EPU). On July 25, 2011, via electronic mail, the NRC provided a request for additional information (RAI) related to turbine generator missile generation, Spent Fuel Pool Cooling and Cleanup System, and modification of the emergency feedwater pump recirculation valves needed to support the Balance of Plant Branch acceptance review of the CR-3 EPU License Amendment Request (LAR).
Attachment A to this submittal, "Response to Request for Additional Information to Support NRC Balance of Plant Branch Acceptance Review of the CR-3 EPU LAR," provides the CR-3 formal response to the RAI.
In support of the CR-3 EPU acceptance review RAI responses, four enclosures are provided. , "Siemens Technical Report CT-27438, "Missile Probability Analysis Report Progress Energy Crystal River 3," Revision 1 (Confidential), provides the CR-3 specific turbine missile generation probability analysis performed for EPU conditions. Enclosure 2, "Siemens Technical Report CT-27438, "Missile Probability Analysis Report Progress Energy Crystal River 3," Revision IA (For Public Record), provides a redacted version of the CR-3 specific turbine missile generation probability analysis. Enclosure 3, "EFW Pump Recirculation Valve Simplified Diagrams (Figures 1 and 2)," provides simplified diagrams of the proposed addition of emergency feedwater (EFW) pump recirculation valves. Enclosure 4, "Summary of Emergency Feedwater Pump Recirculation Valve Modification Failure Modes and Effects Analysis," provides a summary of the Failure Modes and Effects Analysis prepared for the new EFW pump recirculation valves.                                                                            I Progress Energy Florida, Inc.
týbý Crystal River Nuclear Plant 15760 W. Powerline Street Crystal River, FL 34428
 
U.S. Nuclear Regulatory Commission                                                      Page 2 of 3 3F0811-02  contains Siemens Technical Report CT-27438 which includes information that Siemens considers confidential. Siemens Energy, Inc., as the owner of that confidential information, has executed the affidavit provided in Attachment B and states that the identified proprietary information has been classified as confidential, is customarily held in confidence, and not made available to the public. Siemens requests that the identified confidential information be withheld from public disclosure in accordance with the provisions of 10 CFR 2.390(a)(4). is a for public record copy of Siemens Technical Report CT-27438 with the confidential information redacted.
This correspondence contains no new regulatory commitments.
If you have any questions regarding this submittal, please contact Mr. Dan Westcott, Superintendent, Licensing and Regulatory Programs at (352) 563-4796.
Sincer~el, JnA. Fo.Franke Vice President Crystal River Nuclear Plant JAF/gwe Attachments:
A. Response to Request for Additional Information to Support NRC Balance of Plant Branch Acceptance Review of the CR-3 EPU LAR B. Siemens Affidavit for Withholding Proprietary Information from Public Disclosure
 
==Enclosures:==
: 1. Siemens Technical Report CT-27438, "Missile Probability Analysis Report Progress Energy Crystal River 3," Revision 1 (Confidential)
: 2. Siemens Technical Report CT-27438, "Missile Probability Analysis Report Progress Energy Crystal River 3," Revision lA (For Public Record)
: 3. EFW Pump Recirculation Valve Simplified Diagrams (Figures 1 and 2)
: 4. Summary of Emergency Feedwater Pump Recirculation Valve Modification Failure Modes and Effects Analysis xc:      NRR Project Manager Regional Administrator, Region II Senior Resident Inspector State Contact
 
U.S. Nuclear Regulatory Commission                                                      Page 3 of 3 3F0811-02 STATE OF FLORIDA COUNTY OF CITRUS Jon A. Franke states that he is the Vice President, Crystal River Nuclear Plant for Florida Power Corporation, doing business as Progress Energy Florida, Inc.; that he is authorized on the part of said company to sign and file with the Nuclear Regulatory Commission the information attached hereto; and that all such statements made and matters set forth therein are true and correct to the best of his knowledge, information, and belief.
o~nA. Franke
                                                //Vice President Crystal River Nuclear Plant The    foregoing    document    was  acknowledged      before me  this      /    day of 6 KAI2011,                  by Jon A. Franke.
Signature of Notary Public State of Florida (Print, type, or stamp Commissioned Name of Notary Public)
Personally    ,/          Produced Known                -OR- Identification
 
FLORIDA POWER CORPORATION CRYSTAL RIVER UNIT 3 DOCKET NUMBER 50-302 /LICENSE NUMBER DPR-72 ATTACHMENT A RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION TO SUPPORT NRC BALANCE OF PLANT BRANCH ACCEPTANCE REVIEW OF THE CR-3 EPU LAR
 
U. S. Nuclear Regulatory Commission                                                Attachment A 3F0811-02                                                                              Page 1 of 8 RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION TO SUPPORT NRC BALANCE OF PLANT BRANCH ACCEPTANCE REVIEW OF THE CR-3 EPU LAR By letter dated June 15, 2011, Florida Power Corporation (FPC), doing business as Progress Energy Florida, Inc., requested a license amendment to increase the rated thermal power level of Crystal River Unit 3 (CR-3) from 2609 megawatts (MWt) to 3014 MWt. The proposed license amendment is considered an Extended Power Uprate (EPU). On July 25, 2011, via electronic mail, the NRC provided a request for additional information (RAI) related to turbine generator missile generation, Spent Fuel Pool Cooling and Cleanup System, and modification of the emergency feedwater pump recirculation valves needed to support Balance of Plant Branch acceptance review of the CR-3 EPU License Amendment Request (LAR).
NRC Request for Additional Information Our Balance-of-Plant Branch completed an acceptance review of the Crystal River 3 EPU LAR.
We found the application unacceptable with opportunity to supplement consistent with the guidelines of LIC-109. This conclusion is based on the following 3 information insufficiencies in the Technical Report associated with the LAR:
: 1. Section 2.5.1.2.2 of the TR describes that the replacement turbine will have a missile generation probability of 3.5 E-05 based on a 100000 hour inspection interval, which the licensee described as satisfying NRG Guidelines from SRP Section 3.5.1.3. However, the licensee provided no description of the analysis used to determine the missile generation probability. At a minimum, the licensee must include a description of the methodology, the basis for acceptance of the methodology, and assumptions used in the analysis.
: 2. Section 2.5.4.1 of the TR describes how acceptable pool temperatures of less than 160'F can be achieved at EPU conditions by extending the time after shutdown. However, the licensee does not describe how these analysis results would be translated into procedures for refueling, consistent with the requirements of Criterion 5 of 10 CFR Part 50, Appendix B. The applicant must describe the effect of the analysis results on plant operating procedures subject to quality assurance program requirements, such as refueling procedures.
: 3. In several locations in the LAR, the licensee briefly describes a modification to the minimum flow recirculation control for the emergency feedwater pumps. Improper operation of the modification could cause failure of the pump, and the modification could be configured such that it introduces cross-train dependencies. The licensee must provide details of the modification necessary to establish that the modification would not adversely affect the independence of the emergency feedwater trains, such as a failure modes and effects analysis, and that the modification would not substantially reduce the reliability of the individual pumps (TMI Action Plan Item II.E. 1.1), consistent with the guidelines of SRP Section 10.4.9.
 
U. S. Nuclear Regulatory Commission                                                Attachment A 3F0811-02                                                                              Page 2 of 8 CR-3 Responses:
: 1. Section 2.5.1.2.2 of the TR describes that the replacement turbine will have a missile generation probability of 3.5 E-05 based on a 100000 hour inspection interval, which the licensee described as satisfying NRG Guidelines from SRP Section 3.5.1.3.
However, the licensee provided no description of the analysis used to determine the missile generation probability. At a minimum, the licensee must include a description of the methodology, the basis for acceptance of the methodology, and assumptions used in the analysis.
An analysis to determine the turbine missile generation probability was performed for EPU conditions. A description of the methodology used and the analysis results are documented in Siemens Technical Report CT-27438, "Missile Probability Analysis Report Progress Energy Crystal River 3" (Enclosures 1 and 2) for the Siemens BB281-18m2 low pressure (LP) turbine design. This CR-3 turbine missile probability analysis used the missile analysis methodology provided in Siemens Technical Report CT-27332, "Missile Probability Analysis for the Siemens 13.9 M2 Retrofit Design of Low-Pressure Turbine by Siemens AG" (Reference 2). This methodology has been previously approved by the NRC for the BB281-13.9m2 LP turbine design, which is an advancement over the Westinghouse BB281 model originally used at CR-3, as documented in a letter from Herbert Berkow (NRC) to Stan Dembkoski (SWPC), dated March 30, 2004 (Reference 3). In the associated NRC Safety Evaluation, the NRC staff concluded that the technical report could be applied generically to other designs that are dimensionally different but follow the same missile analysis methodology.
Assumptions used in the CR-3 turbine missile generation probability analysis documented in the CR-3 specific Technical Report CT-27438 are equivalent to those documented in the NRC approved Technical Report CT-27332.
A confidential version of the Siemens Technical Report CT-27438 is provided in Enclosure 1 and a for public record copy of the report is provided in Enclosure 2.
Maintenance, inspection and testing associated with the turbine rotors and the turbine overspeed control system, including frequencies of these activities, will not change as a result of EPU. CR-3 utilizes a quarterly test frequency for the main turbine governor and throttle valves and an inspection interval on the turbine rotors and blades of every five refueling outages (approximately 10 year interval or < 87,600 operating hours), which is conservative to the manufacturer recommended inspection frequency of 100,000 operating hours. These current testing and inspection frequencies ensure a reasonably low probability of generating turbine missiles.
 
U. S. Nuclear Regulatory Commission                                                  Attachment A 3F0811-02                                                                              Page 3 of 8
: 2.      Section 2.5.4.1 of the TR describes how acceptable pool temperatures of less than 160'F can be achieved at EPU conditions by extending the time after shutdown.
However, the licensee does not describe how these analysis results would be translated into procedures for refueling, consistent with the requirements of Criterion 5 of 10 CFR Part 50, Appendix B. The applicant must describe the effect of the analysis results on plant operating procedures subject to quality assurance program requirements, such as refueling procedures.
Consistent with 10 CFR 50, Appendix B, Criterion V requirements, the CR-3 spent fuel pool (SFP) steady state temperature of 160'F is currently quantitatively controlled via plant operating procedures by providing appropriate limitations and requirements. CR-3 procedure controls include;
* Operating Daily Surveillance Log provides a maximum SFP temperature acceptance criterion of 120'F;
            "  SFP high temperature alarm setpoint is 140'F;
* SFP cooling operation procedure provides steps to operate two SFP cooling pumps in parallel, during refueling and when defueled, to ensure the SFP temperature is maintained < 160'F;
* SFP cooling operation procedure provides a Note that precludes placing the purification demineralizer in service with SFP temperature > 140'F;
            " Refueling operation procedures require Reactor Coolant System (RCS) temperature to be < 140'F 'during core offload, shuffles, and reload, which translates to the SFP when RCS is connected to the transfer canal; and
* Refueling operation procedures require the reactor to be subcritical for at least 150 hours prior to movement of irradiated fuel in the reactor vessel to ensure SFP thermal analysis assumptions are maintained. A Note in this procedure allows fuel to be transferred to the SFP before 150 hours if an engineering evaluation of the SFP thermal performance is made provided the reactor has been subcritical for 72 hours consistent with the fuel handling accident assumption.
A summary of the bounding analyses is presented in Section 2.5.4.1, "Spent Fuel Pool
      .Cooling and Cleanup System," of the CR-3 EPU Technical Report (TR) (Reference 1, Attachment 7). The bounding analysis indicates that, with a full core offload after operating at EPU conditions for a full fuel cycle, both trains of SFP cooling capacity is greater than the core decay heat load at 11.24 days (270 hours).
Potentially affected calculations and associated procedures are identified for EPU implementation and are being tracked for revision via the CR-3 engineering change (EC) process. In accordance with the CR-3 EPU LAR Regulatory Commitment 2 (Reference 1, Attachment 10), procedures subject to quality assurance program requirements, such as refueling operation procedures, will be modified to reflect the analysis results presented in Section 2.5.4.1 of the CR-3 EPU TR prior to exceeding 2609 MWt. Specifically, the refueling operation procedure will be updated to require the reactor to be subcritical for at least 270 hours prior to movement of irradiated fuel in the reactor vessel. Additionally, the current allowance to perform an engineering evaluation which allows fuel to be
 
U. S. Nuclear Regulatory Commission                                                Attachment A 3F0811-02                                                                            Page 4 of 8 transferred to the SFP before the analysis delay time (270 hours) will be maintained for operation at EPU conditions provided the reactor has been subcritical for 72 hours.
: 3. In several locations in the LAR, the licensee briefly describes a modification to the minimum flow recirculation control for the emergency feedwater pumps. Improper operation of the modification could cause failure of the pump, and the modification could be configured such that it introduces cross-train dependencies. The licensee must provide details of the modification necessary to establish that the modification would not adversely affect the independence of the emergency feedwater trains, such as a failure modes and effects analysis, and that the modification would not substantially reduce the reliability of the individual pumps (TMI Action Plan Item II.E.1.1), consistent with the guidelines of SRP Section 10.4.9.
As stated in Appendix E, "Major Plant Modifications," of the CR 3 EPU TR (Reference 1, Attachment 7), Emergency Feedwater (EFW) System flow needs to be increased roughly in proportion to decay heat for EPU conditions. The required EFW pumps can supply the required flow, but are currently prevented from doing so by continuously in-service recirculation flow paths. An upgrade to the EFW pumps recirculation design is being developed in accordance with the CR 3 EC process to support the higher EFW flow requirements to the once-through steam generators (OTSGs) at EPU conditions. The EFW pump recirculation line modification design considers the probability of pump failure due to improper operation of the new components and ensures cross-train dependencies are not introduced as a result of the modification, thereby maintaining independence of the EFW trains.
EFW Pump Recirculation Line Modification Overview As described in Section 2.8.5.2.3, "Loss of Normal Feedwater," and Appendix E of the CR 3 EPU TR (Reference 1, Attachment 7), the most limiting Design Basis Accident (DBA) for EFW System flow is the loss of feedwater (LOFW) event that requires a minimum EFW flow of 660 gallons per minute (gpm) (330 per SG) within 40 seconds.
The current minimum required flow of EFW is 550 gpm (275 gpm per SG) within 60 seconds. Therefore, in order to meet the new flow requirements for EPU, the EFW System will be modified by installing new safety-related operated valves in the currently continuously open EFW pump recirculation lines. The recirculation valves will close when flow (as detected by differential pressure switches) to the OTSGs is sufficient to meet or exceed the pump manufacture's minimum recommended flow rates and reopen prior to EFW pump flow demand dropping below the minimum required pump flow rate.
The differential pressure switches are provided with a dead band to prevent or minimize excessive cycling of the new recirculation valves. By installing valves in the recirculation lines that automatically close during times of high flow to the OTSGs, the current EFW pumps capacity and head can supply the OTSGs under EPU conditions.
 
U. S. Nuclear Regulatory Commission                                                  Attachment A 3F0811-02                                                                              Page 5 of 8 The EFW System consists of two independent, 100% capacity, safety-related trains. The A EFW train consists of a diesel driven pump (EFP-3), flow limiting cavitating venturi, and flow control valves to each OTSG. The B EFW train consists of a turbine driven pump (EFP-2), flow limiting cavitating venturi, and flow control valves to each OTSG.
Each of the new recirculation valves will be controlled by three safety-related differential pressure switches that sense flow across the associated cavitating venturi. A "2 out of 3 logic" will be required to open or close the associated safety-related EFW pump recirculation valve. EFW pump recirculation valve simplified piping diagrams are provided in Enclosure 3 showing the new valves in the EFW pump recirculation line and the sensing differential pressure instrumentation. The differential pressure switches, logic, control and motive power for each recirculation valve will be powered from the same safety-related electrical train as the associated EFW train.
A control switch will be added to the control room for each of the new EFW pump recirculation valves. Each switch will have "open" position to allow overriding the automatic operation forcing the valve to the open position. Control room alarms will also provide indication of the new valves "out of position" when the control switches are overriding the automatic function. As stated in the proposed CR-3 Improved Technical Specifications (ITS) Bases B 3.7.5, "Emergency Feedwater System" (Reference 1, Attachment 4), the EFW pump low flow instrumentation is required to be capable of closing the associated recirculation line isolation valve in sufficient time to ensure that EFW discharge flow to the OTSGs as assumed during transients and accidents is met.
Thus, if an EFW pump recirculation valve control switch is placed in the open position, the associated EFW train would be rendered inoperable and ITS 3.7.5 Actions would apply.
EFW Train Independence Enclosure 4 provides a summary of a failure mode and effects analysis (FMEA) conducted for the EFW pump recirculation valve modification. The FMEA was prepared in accordance with the general guidelines of ANSI/IEEE 352-1987, "IEEE Guide for General Principles of Reliability Analysis of Nuclear Power Generating Station Safety Systems." Note that the Number column in Enclosure 4 provides an arbitrary reference number for individual components or group of components and may be referenced by other failures in the matrix for cascading failures (e.g., Enclosure 4, Row 70.2). Note 1 to the Enclosure 4 table is also provided for failure sets which assume varied EFW flows through the cavitating venturi.
The FMEA indicates that there are no new potential EFW System failures that could result from human errors, common causes, single-point vulnerabilities, and test and maintenance outages as a result of the EFW pump recirculation valve modification which would prevent the EFW System from performing its intended safety function consistent with the position of NUREG-0737, "Clarification of TMI Action Plan Requirements,"
 
U. S. Nuclear Regulatory Commission                                                  Attachment A 3F0811-02                                                                                Page 6 of 8 Item II.E. 1.1. As indicated by the FMEA, postulated component failures are bounded by the current failure of a single EFW train and do not prevent the EFW System from performing its intended safety function.
Each EFW train is mechanically independent since each train has its own suction line from the emergency feedwater tank (EFT-2), pump, recirculation line back to EFT-2, cavitating venturi, and piping with flow control valves to each OTSG. Although piping cross connections are supplied at the suction piping from EFT-2 and at the discharge lines to the OTSG's, these cross connections are only used for defense in depth and are controlled via ITS Surveillance Requirements (i.e., SR 3.7.5.1) to maintain independence.
ITS SR 3.7.5.1 requires, in part, that each EFW manual, power operated, and automatic valve in each water flow path that is not locked, sealed, or otherwise secured in position, is in the correct (i.e., accident) position. The addition of a safety-related recirculation valve on each independent EFW train recirculation line and utilizing the associated cavitating venturi for flow measurement will not impact this mechanical independence.
Each EFW train is electrically independent with all system instrumentation and controls (I&C) and electrical power supplied by independent safety related busses and batteries.
The current electrical and I&C portions of the EFW System are designed and installed in accordance with IEEE 279-1971, "Criteria for Protection Systems for Nuclear Power Generating Stations," which ensures independence with no cross-train dependence. The new EFW pump recirculation valves, including the control circuits, control room switches, and alarms are also being designed and procured using the same standard (i.e.,
IEEE 279-1971).
In addition to mechanical and electrical independence, the EFW trains are physically separated. The A EFW train (EFP-3) is located in its own safety-related building located on the west side of the plant. Also located in this building is all of the auxiliary equipment, including starting air, fire protection, HVAC, cavitating venturi, recirculation line, etc. The B EFW train (EFP-2) and all its auxiliary equipment is located in the Intermediate Building inside the plant. The new recirculation valves and associated differential pressure switches will be installed locally in the associated pump rooms. This ensures that the physical separation of the current EFW System is maintained following completion of the modification.
Based on the conceptual design of the new EFW pump recirculation valves and the results of the associated FMEA, CR 3 has determined that mechanical, electrical, and physical separation and independence of the EFW System will be maintained and that no new common mode failures are created by the modification.
 
U. S. Nuclear Regulatory Commission                                                  Attachment A 3F0811-02                                                                                Page 7 of 8 EFW Pump Protection and Reliability The EFW System modification installing new EFW pump recirculation valves is designed to maintain or enhance overall reliability by focusing on long term EFW pump protection. The current B train EFW pump (EFP-2) has a limitation on the time that it can be operated under normal conditions (approximately 3 hours) due to an undersized recirculation line (1 inch). Because of the undersized line, the minimum manufacture recommended flow rate of 250 gpm for continuous operation of the pump cannot be achieved with flow solely through the minimum flow line. In addition, the undersized line results in very high flow velocities which have resulted in past modification to change materials and increase pipe thickness to compensate for the wear from these high velocities. The EFW pump recirculation valve modification ensures the pump recirculation line is isolated when flow to the OTSGs is sufficient to meet minimum recommended flow rates and automatically un-isolates prior to EFW pump flow dropping below the minimum required pump flow rate. Adding the automatic recirculation valves will allow the recirculation line to be increased in size from the current 1 inch to a 2 inch line while still maintaining adequate pump margin. The increase in the recirculation line size will improve the recirculation flow rate to support continuous operation of the EFW pump and decrease the flow velocities to normally acceptable rates.
The new EFW pump recirculation valves and control logic are designed to ensure pump protection for long term reliability. Although the safety function position of the valve is closed to ensure the minimum 660 gpm for the LOFW event, the new valves are spring to open and will fail open on a loss of power. In addition the control logic was designed requiring 2 of 3 flow signals to close the valve and no ability to manually close the recirculation is provided in the main control room. This design was chosen to minimize the probability of operating the EFW pump with no flow resulting in possible pump damage. Designing the valves to fail in the open position is considered acceptable based on:
The LOFW event analysis for EPU conditions indicates that a required EFW flow of 660 gpm. If an EFW pump recirculation valve fails in the closed position, the EFW pump can still supply the required EFW flow to the OTSGs. However, when flow demand to the OTSGs decreases, pump minimum flow requirements may not be met resulting in possible pump damage and loss of the EFW pump for long term accident mitigation.
The current worst case single failure is a complete loss of an EFW train (e.g.,
pump fails to start, loss of both control valves, etc). The failure of a new EFW pump recirculation valve on one EFW train is considered a single failure. As a result of one EFW pump recirculation valve failing open, one EFW train could not supply the needed 660 gpm, however, the redundant EFW train would be
 
U. S. Nuclear Regulatory Commission                                                Attachment A 3F0811-02                                                                              Page 8 of 8 available to supply the required flow to the OTSGs, and the affected EFW pump would be available with a reduced flow to the OTSGs.
To ensure the reliability of the new components being installed under this modification, components (e.g., valves, pressure transmitters, etc.) are being designed, fabricated, and procured as safety-related. In addition to IEEE 279-1971 and IEEE 352-1987, the new components are also being seismically and environmentally qualified as applicable and are being designed to meet or exceed the codes and standards as required by CR-3 current licensing basis, including the following:
            "    IEEE 308-1969, "Criteria for Class lE Electrical Systems,"
            "    IEEE 323-1974, "IEEE Standard for Qualifying Class IE Equipment for Nuclear Power Generating Stations," and
            "    IEEE 344-1971, "IEEE Guide for Seismic Qualification of Class I Electrical Equipment for Nuclear Power Generating Stations."
As described in Section 2.13, "Risk Evaluation," of the CR 3 EPU TR (Reference 1, Attachment 7), CR-3 uses a probabilistic safety assessment (PSA) model to determine the effect of the EPU modifications on core damage frequency (CDF) and large early release frequency (LERF). PSA analyses performed for the EPU indicate that the increased EFW flow assumed in the LOFW analysis is not required to prevent core damage.
Therefore, the new EFW pump recirculation valves do not change the PSA success criteria of the EFW System and the new recirculation valves are not included in the PSA model for EPU.
CR-3 concludes that since; the new EFW System components are being designed to meet or exceed the current CR-3 codes and standards, the modification is designed with a high emphasis on pump protection and reliability for long term availability, and there is no affect to the CDF or LERF; the modification to the EFW System will not significantly reduce the reliability of the individual EFW pumps to perform their safety function.
References
: 1. CR-3 to NRC letter dated June 15, 2011, "Crystal River Unit 3 - License Amendment Request #309, Revision 0, Extended Power Uprate" (Accession No. ML112070659).
: 2. Siemens Technical Report CT-27332, "Missile Probability Analysis for the Siemens 13.9 M2 Retrofit Design of Low-Pressure Turbine by Siemens AG" Revision 2.
: 3. Letter from Mr. Herbert N. Berkow, (NRC) to Mr. Stan Dembkoski (SWPC) dated March 30, 2004,
 
==Subject:==
Final Safety Evaluation Regarding Referencing the Siemens Technical 2
Report No. CT-27332, Revision 2, "Missile Probability Analysis for the Siemens 13.9 M Retrofit Design of Low-Pressure Turbine by Siemens AG" (TAC No. MB7964).
 
FLORIDA POWER CORPORATION CRYSTAL RIVER UNIT 3 DOCKET NUMBER 50-302 /LICENSE NUMBER DPR-72 ATTACHMENT B SIEMENS AFFIDAVIT FOR WITHHOLDING PROPRIETARY INFORMATION FROM PUBLIC DISCLOSURE
 
AFFIDAVIT OF WITHHOLDING I, John P. Musone hereby provide this Affidavit and state as follows:
: 1. I am Assistant Secretary for Siemens Energy, Inc., having its principle offices at 4400 Alafaya Trail, Orlando, Florida 32826 ("Siemens"), and Associate Chief Intellectual Property Counsel for its parent Siemens Corporation.
: 2.      This statement is under 10 C.F.R. 2.390 and NRC Regulatory Issue Summary 2004-11.
: 3.      10 C.F.R. 2.390(a)(4) provides for nondisclosure of information provided to the Nuclear Regulatory Commission that constitutes "trade secrets and commercial or financial information obtained from a person and privileged or confidential."
: 4.      10 C.F.R. 2.390(b)(1)(ii) and (iii) provide for submission of an Affidavit as the mechanism by which such nondisclosure is affected, and specifies that the Affidavit --
A. Identifies the document or part sought to be withheld; B. Identifies the official position of the person making the affidavit; C. Declares the basis for proposing the information be withheld, encompassing considerations set forth in Sec. 2.390(a);
D. Includes a specific statement of the harm that would result if the information sought to be withheld is disclosed to the public; and E. Indicates the location(s) in the document of all information sought to be withheld; F. Contain a full statement of the reason for claiming the information should be withheld from public disclosure. Such statement shall address with specificity the consideration listed in paragraph (b)(4) of this section.
: 5. Following the Overview, this Affidavit tracks the affidavit organization and requirements of 10 C.F.R. 2.390.
Overview
: 6.      Siemens contracted with Progress Energy Florida, (PEF) to design, fabricate, deliver and install BB281-18m 2 turbine improvements to PEF's Crystal River #3 Nuclear Power Plant in Crystal River Florida. In preparation of the design of the BB281-18m 2 turbine, Siemens performed a Missile Probability Analysis and documented this analysis in Missile Probability Analysis Report CT-27438 Revision 1 dated 8/25/2008 (the "MPAR").
: 7.      PEF has requested Siemens permission to provide the MPAR to the NRC.
Siemens is amenable to provide a redacted version of the MPAR titled Missile Probability Analysis Report CT-27438 Revision 1A dated 8/05/2011 (the "R-MPAR").
: 8.      The MPAR contains highly sensitive and confidential design information which embodies Siemens' state-of-the-art design and analysis parameters for Siemens turbine rotors.
: 9.      Public disclosure of the MPAR would (i) provide a windfall shortcut for Siemens competitors to obtain Siemens' rotor design and analysis parameters and thereby replicate Siemens components, and (ii) allow Siemens competitors to glean the capabilities and limits of Siemens' technology. This confidential information is invaluable when competing and akin to having the opposing team's playbook before and during the big game.
Document or Part Sought to be Withheld
: 10. Siemens specific confidential rotor design and parameters and calculation results contained within the MPAR prepared by Siemens pertaining to the BB281-18m 2 turbine improvements at PEF's Crystal River #3 Nuclear Power Plant.
2
 
Official Position of Person Making the Affidavit
: 11. The person making this Affidavit is John P. Musone, Assistant Secretary for Siemens Energy, Inc., having its principle offices at 4400 Alafaya Trail, Orlando, Florida 32826
("Siemens"), and Associate Chief Intellectual Property Counsel for its parent Siemens Corporation.
Basis for the Information to be Withheld
: 12. The basis for the information to be withheld, is Section 2.390(a)(4) - "trade secrets and commercial or financial information obtained from a person and privileged and confidential." The person to provide the information is Siemens via PEF. The trade secret information is the specific rotor design parameters and calculation results contained within the MPAR prepared by Siemens pertaining to the BB281-18m 2 turbine improvements at PEF's Crystal River #3 Nuclear Power Plant that is confidential and proprietary to Siemens and only provided to PEF under strict terms of confidentiality.
Specific Statement of Harm Due to Public Disclosure
: 13. The general public has no defined interest in the specific confidential rotor design parameters and calculation results contained within the MPAR and would not undergo any harm due to its nondisclosure. The general public presumably is not interested in replicating Siemens components. The specific confidential rotor design parameters and calculation results contained within the MPAR provide no newsworthy or publicly-relevant information regarding the Crystal River Nuclear Plant. A false argument could be made that Siemens' competitors are "the public" and that they would be harmed because they would then not obtain a windfall shortcut to replicate Siemens components and glean Siemens capabilities.
Locations in the Document of Information to be Withheld
: 14. The portions of the R-MPAR identified in brackets that illustrate confidential rotor design parameters and calculation results (e.g. rotor disk temperatures, rotor disk stresses, fracture toughness and yield strength information, rotor disk crack initiation probability(s),
simulation results) for the Crystal River #3 BB281-18m 2 turbine has been withheld.
3
 
Full Statement of Reason for Claiming the Information Should be Withheld
: 15. Through its own innovation, substantial investment in research and development and by virtue of its long established experience as a world renowned going-concern in the power 2
generation industry, Siemens successfully developed the turbine design embodied BB281-18m turbine delivered to PEF. Siemens prepared the MPAR which in turn discloses the design parameters and calculation results (e.g. rotor disk temperatures, rotor disk stresses, fracture toughness and yield strength information, rotor disk crack initiation probability(s) and simulation results) from which Siemens' turbine is designed and manufactured. Public disclosure of the MPAR would (i) provide a windfall shortcut for Siemens competitors to obtain Siemens' rotor design parameters and thereby replicate Siemens components, and (ii) allow Siemens competitors to glean the capabilities and limits of Siemens' technology. This confidential information is invaluable when competing and akin to having the opposing team's playbook before and during the big game.
: 16.      Siemens' specific turbine design information as embodied in the MPAR is valuable, confidential and proprietary business assets of Siemens and constitute trade secrets.
They derive independent economic value from not being generally known and not being readily ascertainable by proper means by other persons who can obtain economic value from their disclosure or use. It is Siemens' understanding that the specific turbine design information as embodied in the MPAR is customarily held in confidence throughout the industry and is not made publicly available.
: 17.      Siemens has adopted reasonable measures to maintain the secrecy of its trade secrets; to-wit: securing their business offices and facilities with private fences and borders restricting access via key pads requiring individual access codes, locking main building doors, locking file cabinets, password-protecting computer files, using automated e-mail encryption, and locking portable computers. Siemens also shreds confidential documents that are no longer in use.
4
: 18. In addition, Siemens requires its employees with access to Siemens trade secrets, to execute confidentiality agreements agreeing to maintain the confidentiality of the trade secrets. Further, Siemens employees are required to complete instruction modules covering, inter alia,protection of corporate confidential information and the importance of maintaining the secrecy of Siemens' trade secrets. Siemens' employees are also required to participate in routine security programs and checks directed by company security officers to ensure that the security measures are being followed.
: 19. Siemens further requires that, prior to any provision of Siemens confidential information to a third party, Siemens's management must authorize such disclosure and the third party must first execute a confidentiality agreement agreeing to maintain Siemens's confidential information in confidence. Siemens included a confidentiality provision in its contract with PEF.
: 20. For the foregoing reasons, Siemens' specific turbine design information as embodied in the MPAR comprise its confidential, proprietary and trade secret information. The general public has no defined interest in this design information and would not undergo any harm due to its nondisclosure. On the other hand, public disclosure of this design information would (i) provide a windfall shortcut for Siemens competitors to obtain Siemens' rotor design parameters and thereby replicate Siemens components, and (ii) allow Siemens competitors to glean the capabilities and limits of Siemens' technology. It is therefore respectfully requested that portions of Siemens MPAR remain in confidence.
Ai0 SIGNED UNDER THE PAINS AND PENALTIES OF PERJURY THIS                        1 0 DAY    OF August, 2011.
J0)~ P. Musone Assistant Secretary; Siemens Energy, Inc.
Associate Chief Intellectual Property Counsel; Siemens Corporation 5
 
FLORIDA POWER CORPORATION CRYSTAL RIVER UNIT 3 DOCKET NUMBER 50-302 /LICENSE NUMBER DPR-72 ENCLOSURE 3 EFW PUMP RECIRCULATION VALVE SIMPLIFIED DIAGRAMS (FIGURES 1 AND 2)
 
Figure 1 Simplified Diagram of EFP-3 Recirculation Valve FS1,2, 3 Opens on low flow of
                                                                              <350 gpm EFV- -F4 6 Auto            Open Note:
Drawing omits some valves, contacts, relays and instruments for simplicity and clarity.
Differential pressure switches use nominal numbers subject to inst uncertainty.
DPDP-5D BRKR-1 I efSAR Fig 10-031 1
 
Figure 2 Simplified Diagram of EFP-2 Recirculation Valve 1"
To EFT-2 EE~Ifi I
1V"                                                                                m
                                                                                              *                =
II
                                                                              =
FS1
                                                                        ~351gpMIj      FS g~I
                                                                                  &#xfd; 350      M1?
1    ~350FS2gmjM FS2        FS3              FS3
                                                                      > 350 g FS1,2, 3 Opens on low flow of
                                                                                                            < 250 gpm I    F-8 0 EFP-2 Recirc Valve L~1            I    F-2FO                                                10 Auto            Open I  EFP-Note:
Drawing omits some valves, contacts, relays                            DPDP-5B BRKR-5 I    efSAR Fig 10-03    and instruments for simplicity and clarity.
Differential pressure switches use nominal numbers subject to inst uncertainty.
2
 
FLORIDA POWER CORPORATION CRYSTAL RIVER UNIT 3 DOCKET NUMBER 50-302 /LICENSE NUMBER DPR-72 ENCLOSURE 4
 
==SUMMARY==
OF EMERGENCY FEEDWATER PUMP RECIRCULATION VALVE MODIFICATION FAILURE MODES AND EFFECTS ANALYSIS
 
U. S. Nuclear Regulatory Commission                                                                                                                                          Enclosure 4 3F0811-02                                                                                                                                                                  Page 1 of 37 Summary of Emergency Feedwater Pump Recirculation Valve Modification Failure Modes and Effects Analysis z  Name          Failure Mode      Cause                Symptoms and        Method of          Inherent            Effect on ECCS                      Remarks and Other Local Effects      Detection          Compensating                                            Effects (D                                                          Including                              Provision
  -                                                            Dependent Failures 1.1    EFV-1 79      Fail OPEN          Electrical or        Ability of one train Annunciator alarm  EFW Train B        A single (1 of 2) train would no mechanical failure    of EFW to mitigate  triggered by valve  available in the    longer be able to perform its an accident would    out of position. event of complete  design functions. The affected be reduced.        Actual position vs. failure of affected trains flow would be demanded            pump.              approximately 75% of design.
position.                              100% design flows are typically necessary only early in accidents.
The train with the failure will regain the ability to fully mitigate later in the accident scenario.
1.2.1  EFV-1 79      Fail CLOSED        Electrical or          Immediate          Annunciator alarm  EFW Train B        A single (1 of 2) train would no    During periods of low flow mechanical failure,  damage to EFP-3      triggered by valve  available and      longer be able to perform its        one train of EFW could be
                                                              '<250 GPM            out of position. running during the  design functions.                    removed from service.
through pump.'      Actual position vs. event of complete                                        EFV-179 being in the demanded            failure of affected                                      closed position will only be position.          pump.                                                    a detriment during periods of low to no demand. This occurs late or outside of accident conditions with exception to LOCA.
1.2.2  EFV-1 79      Fail CLOSED        Electrical or        Accelerated wear /  Annunciator alarm  EFW Train B        The affected train would no mechanical failure,  damage to EFP-2      triggered by valve  available in the    longer be credited to perform its
                                                              '>250 GPM <300      out of position. event of complete  design functions.
GPM through          Actual position vs. failure of affected pump.,              demanded            pump.
position.
1.2.3  EFV-179      Fail CLOSED        Electrical or          No damage to        Annunciator alarm  EFW Train B        n/a mechanical failure. EFP-2 '>300 GPM    triggered by valve  available.
through pump.'      out of position.
Actual position vs.
demanded position.
(1)    "a" denotes flow through the cavitating venturi of >350 GPM "b" denotes flow through the cavitating venturi of >250 GPM <350 GPM increasing "c" denotes flow through the cavitating venturi of >250 GPM <350 GPM decreasing
 
U. S. Nuclear Regulatory Commission                                                                                                                                          Enclosure 4 3F0811-02                                                                                                                                                                  Page 2 of 37 z    Name          Failure Mode      Cause                Symptoms and      Method of          Inherent            Effect on ECCS                      Remarks and Other 1                                                          Local Effects      Detection          Compensating                                            Effects Including                              Provision
  -Dependent Failures 1.3.1    EFV-1 79      Fail Mid-Travel    Electrical or        Immediate          Annunciator alarm  EFW Train B        During periods of low flow one mechanical failure    damage to EFP-3    triggered by valve  available and      train of EFW could be removed
                                                                '<250 GPM          out of position. running during the  from service. EFV-179 being in through pump.'    Actual position vs. event of complete  the closed position will only be a demanded            failure of affected detriment during periods of low to position. (includes pump.              no demand. This occurs late or Mid position)                          outside of accident conditions.
1.3.2    EFV-1 79      Fail Mid-Travel    Electrical or        Accelerated wear / Annunciator alarm  EFW Train B        The affected train would no mechanical failure    damage to EFP-3    triggered by valve  available in the    longer be credited to perform its
                                                                '>250 GPM <300    out of position. event of complete  design functions.
GPM through        Actual position vs. failure of affected pump.,            demanded            pump.
position. (includes Mid position) 1.3.3    EFV-1 79      Fail Mid-Travel    Electrical or        No damage to      Annunciator alarm  EFW Train B        n/a mechanical failure    EFP-2 >300 GPM    triggered by valve  available.
through pump.'    out of position.
Actual position vs.
demanded position. (includes Mid position) 1.6      EFV-1 79      Loss of control    Electrical failure    Loss of Automatic  Periodic Test      EFW Train B        A single (1 of 2) train would no    For all flows through Circuit power                            Close of EFV-179                      available          longer be able to perform its        cavitating venturi design functions. The affected EFV-1 79 Opens                                            train s flow would be approximately 75% of design.
100% design flows are typically necessary only early in accidents.
The train with the failure will regain the ability to fully mitigate later in the accident scenario.
1.7      EFV-1 79      Loss of Motive    Electrical failure    Loss of Automatic  Periodic Test      EFW Train B        A single (1 of 2) train would no    For all flows through power                                    Close                                  available          longer be able to perform its        cavitating venturi pFwerof  EFV-179 7desegn                                                      functions. The affected EFV-1 79 Opens                                            train s flow would be approximately 75% of design.
100%/ design flows are typically necessary only early in accidents.
The train with the failure will regain the ability to fully mitigate later in the accident scenario.
(1)      "a" denotes flow through the cavitating venturi of >350 GPM "b" denotes flow through the cavitating venturi of >250 GPM <350 GPM increasing "c" denotes flow through the cavitating venturi of >250 GPM <350 GPM decreasing
 
U. S. Nuclear Regulatory Commission                                                                                                                                      Enclosure 4 3F0811-02                                                                                                                                                                Page 3 of 37 zC    Name          Failure Mode      Cause                Symptoms and        Method of          Inherent            Effect on ECCS                    Remarks and Other Local Effects      Detection          Compensating                                          Effects Including                              Provision
  -Dependent Failures 10.1    EFV-180      Fail OPEN          Electrical or        Ability of one train Annunciator alarm  EFW Train A        One train (1 of 2) of EFW could mechanical failure    of EFW to mitigate  triggered by valve  available and      be removed from service.
an accident would    out of position,    running during the be reduced.          Actual position vs. event of complete demanded            failure of affected position.          pump.
10.2.1  EFV-1 80      Fail CLOSED        Electrical or          Immediate          Annunciator alarm  EFW Train A        A single (1 of 2) train would no mechanical failure. damage to EFP-2      triggered by valve  available in the    longer be able to perform its
                                                                '<100 GPM            out of position. event of complete  design functions.
through pump.'      Actual position vs. failure of affected demanded            pump.
position.
10.2.2  EFV-180      Fail CLOSED        Electrical or        Accelerated wear /  Annunciator alarm  EFW Train A        The affected train would no mechanical failure,  damage to EFP-2      triggered by valve  available in the    longer be credited to perform its
                                                                '>100 GPM <250      out of position. event of complete  design functions after >3 hr.
GPM through          Actual position vs. failure of affected pump.,              demanded            pump.
position.
102.3    EFV-180      Fail CLOSED        Electrical or          No damage to        Annunciator alarm  EFW Train A        n/a mechanical failure. EFP-2 >250 GPM      triggered by valve  available.
through pump.'      out of position.
Actual position vs.
demanded position.
10.3.1  EFV-180      Fail Mid-Travel    Electrical or          Immediate          Annunciator alarm  EFW Train A        During periods of low flow one mechanical failure    damage to EFP-2      triggered by valve  available and      train of EFW could be removed
                                                                '<100 GPM            out of position. running during the  from service. EFV-180 being in through pump.'      Actual position vs. event of complete  the closed position will only be a demanded            failure of affected detriment during periods of low to position. (includes pump.              no demand. This occurs late or Mid position)                          outside of accident conditions.
(1)      "a" denotes flow through the cavitating venturi of >350 GPM "b" denotes flow through the cavitating venturi of >250 GPM <350 GPM increasing "c" denotes flow through the cavitating venturi of >250 GPM <350 GPM decreasing
 
U. S. Nuclear Regulatory Commission                                                                                                                                        Enclosure 4 3F0811-02                                                                                                                                                                Page 4 of 37 Z    Name          Failure Mode      Cause                Symptoms and      Method of          Inherent            Effect on ECCS                      Remarks and Other C
Local Effects      Detection          Compensating                                            Effects (D                                                          Including                              Provision
  -*                                                          Dependent Failures 103.2  EFV-180      Fail Mid-Travel    Electrical or        Accelerated wear / Annunciator alarm  EFW Train A        The affected train would no mechanical failure    damage to EFP-2    triggered by valve  available in the    longer be credited to perform its
                                                              '>100 GPM <250    out of position. event of complete  design functions after >3 hr.
GPM through        Actual position vs. failure of affected pump.,            demanded            pump.
position. (includes Mid position) 10.3.3 EFV-180      Fail Mid-Travel    Electrical or        No damage to      Annunciator alarm  EFW Train A        n/a mechanical failure    EFP-2 '>250 GPM    triggered by valve  available through pump.'    out of position.
Actual position vs.
demanded position. (includes Mid position) 10.6  EFV-180      Loss of control    Electrical failure    Loss of Automatic  Periodic Test      EFW Train A        A single (1 of 2) train would no    For all flows through Circuit power                            Close of EFV-180                      available          longer  be able to perform its      cavitating venturi design functions. The affected 20XB energized                                            train s flow would be EFV-180 Opens                                              approximately 75% of design.
100% design flows are typically necessary only early in accidents.
The train with Yhe failure will regain the ability to fully mitigate later in the accident scenario.
10.7  EFV-180      Loss of Motive    Electrical failure    Loss of Automatic  Periodic Test      EFW Train A        A single (1 of 2) train would no    For all flows through power                                    Close of EFV-180                      available          longer be able to perform its        cavitating venturi design functions. The affected 20XB energized                                            train s flow would be EFV-180 Opens                                              approximately 75% of design.
10      design flows are typically necessary only early in accidents.
The train with the failure will regain the ability to fully mitigate later in the accident scenario.
20.1  EFV-23        Fail OPEN          Mechanical failure    N/A                Surveillance        Valve line up.      Valves normal position is open      Manual valve (1)    "a" denotes flow through the cavitating venturi of >350 GPM "b" denotes flow through the cavitating venturi of >250 GPM <350 GPM increasing "c" denotes flow through the cavitating venturi of >250 GPM <350 GPM decreasing
 
U. S. Nuclear Regulatory Commission                                                                                                                                  Enclosure 4 3F0811-02                                                                                                                                                            Page 5 of 37 z    Name          Failure Mode      Cause                Symptoms and      Method of          Inherent            Effect on ECCS                    Remarks and Other C
3                                                            Local Effects      Detection          Compensating                                          Effects Including                            Provision
  -Dependent Failures 20.2.1  EFV-23        Fail CLOSED        Mechanical failure    Immediate        High recirculation EFW Train A        One train of EFW could be damage to EFP-2    line pressure      available and      removed from service prior to
                                                              '<100 GPM                            running during the  operators being able to take through pump.'                        event of complete  compensatory measures.
failure of affected pump.
20.2.2  EFV-23        Fail CLOSED        Mechanical failure    Accelerated wear / High recirculation EFW Train A        One train of EFW could be damage to EFP-2    line pressure      available and      removed from service if
                                                              '>100 GPM <250                        running during the  undiscovered for an GPM through                          event of complete  indeterminate time greater than 3 pump.,                                failure of affected hr. Time periods greater than 3 hr pump.              increase wear and pump degradation.
20.2.3  EFV-23        Fail CLOSED        Mechanical failure    No damage to      High recirculation EFW Train A        None.
EFP-2 '>250 GPM  line pressure      available and through pump.'                        running during the event of complete failure of affected pump.
20.3.1  EFV-23      Fail Mid-Travel    Mechanical failure    Immediate        High recirculation EFW Train A        One train of EFW could be damage to EFP-2    line pressure      available and      removed from service prior to
                                                                '<100 GPM                            running during the  operators being able to take through pump'                        event of complete  compensatory measures.
failure of affected pump.
20.3.2  EFV-23      Fail Mid-Travel    Mechanical failure    Accelerated wear / High recirculation EFW Train A        One train of EFW could be damage to EFP-2    line pressure      available and      removed from service if 5>100 GPM <250                      running during the  undiscovered for an GPM through                          event of complete  indeterminate time greater than 3 pump.,                              failure of affected hr. Time periods greater than 3 hr pump.              increase wear and pump degradation.
(1)    "a" denotes flow through the cavitating venturi of >350 GPM "b" denotes flow through the cavitating venturi of >250 GPM <350 GPM increasing "c" denotes flow through the cavitating venturi of >250 GPM <350 GPM decreasing
 
U. S. Nuclear Regulatory Commission                                                                                                                                    Enclosure 4 3F0811-02                                                                                                                                                              Page 6 of 37 z      Name          Failure Mode      Cause                Symptoms and      Method of          Inherent            Effect on ECCS                    Remarks and Other C
3                                                            Local Effects      Detection          Compensating                                          Effects 0                                                            Including                            Provision
  -Dependent Failures 20.3.3  EFV-23        Fail Mid-Travel    Mechanical failure    No damage to      High recirculation EFW Train A        None.
EFP-2 '>250 GPM    line pressure      available and through pump.'                        running during the event of complete failure of affected pump.
30.1    EFV-34        Fail OPEN          Mechanical failure    EF-6-PI indicates  Surveillance      EFV-5 prevents      Insignificant to no pump          Check valve higher than                          back flow through  performance margin degradation normal pressure                      EFP-2 during the sole operation of EFP-1 30.2.1  EFV-34        Fail CLOSED        Mechanical failure    Immediate          High recirculation EFW Train A        One train of EFW could be damage to EFP-2    line pressure      available and      removed from service prior to
                                                                '<100 GPM                            running during the  operators being able to take through pump'                        event of complete  compensatory measures.
failure of affected pump.
30.2.2  EFV-34        Fail CLOSED        Mechanical failure    Accelerated wear / High recirculation EFW Train A        One train of EFW could be damage to EFP-2    line pressure      available and      removed from service if
                                                                '>100 GPM <250                        running during the  undiscovered for an GPM through                          event of complete  indeterminate time greater than 3 pump.-                                failure of affected hr. Time periods greater than 3 hr pump.              increase wear and pump degradation.
30.2.3  EFV-34        Fail CLOSED        Mechanical failure    No damage to      High recirculation EFW Train A        None.
EFP-2 '>250        line pressure      available and GPM through                          running during the pump.-                                event of complete failure of affected pump.
(1)      "a" denotes flow through the cavitating venturi of >350 GPM "b" denotes flow through the cavitating venturi of >250 GPM <350 GPM increasing "c" denotes flow through the cavitating venturi of >250 GPM <350 GPM decreasing
 
U. S. Nuclear Regulatory Commission                                                                                                                                  Enclosure 4 3F0811-02                                                                                                                                                            Page 7 of 37 zC    Name          Failure Mode      Cause                Symptoms and      Method of          Inherent            Effect on ECCS                      Remarks and Other 3                                                          Local Effects      Detection          Compensating                                            Effects Including                            Provision
  "-                                                          Dependent Failures 30.3.1  EFV-34        Fail Mid-Travel    Mechanical failure    Immediate          High recirculation EFW Train A        One train of EFW could be damage to EFP-2    line pressure      available and      removed from service prior to I<100 GPM                            running during the  operators being able to take through pump'                        event of complete  compensatory measures.
failure of affected pump.
30.3.2  EFV-34        Fail Mid-Travel    Mechanical failure    Accelerated wear / High recirculation EFW Train A        One train of EFW could be damage to EFP-2    line pressure      available and        removed from service if
                                                                >100 GPM <250                        running during the  *undiscovered for an GPM through                          event of complete    indeterminate time greater than 3 pump.,                                failure of affected  hr. Time periods greater than 3 hr pump.                increase wear and pump degradation.
30.3.3  EFV-34        Fail Mid-Travel    Mechanical failure    No damage to      High recirculation EFW Train A          None.
EFP-2 '>250 GPM    line pressure      available and through pump.'                        running during the event of complete failure of affected pump.
40.0.a  EF        Open              Electrical failure    Degraded logic    Periodic Test      EFW Train A & B    Train A Logic degraded from 2/3 FSI(Hi)                                                Loss of                              available          to 2/2 Contact                                                3EF-64-FS1 9-10 40.1 .a EF        Close              Electrical failure    Degraded logic. 1  Periodic Test      EFW Train A & B    Train A Logic degraded from 2/3 FS 1(Hi)                                              of 2 close signals                    available          to 1/2 permanently in Contact                                                place 9-10 40.2.a  EF        Open              Electrical failure    Degraded logic    Periodic Test      EFW Train A & B    Train A Logic degraded FS1 (LO)                                              Loss of seal to                      available Contact                                                3EF-64-FS1 2-3 (1)    "a" denotes flow through the cavitating venturi of >350 GPM "b" denotes flow through the cavitating venturi of >250 GPM <350 GPM increasing "c" denotes flow through the cavitating venturi of >250 GPM <350 GPM decreasing
 
U. S. Nuclear Regulatory Commission                                                                                                                        Enclosure 4 3F0811-02                                                                                                                                                  Page 8 of 37 Z    Name          Failure Mode      Cause                Symptoms and        Method of    Inherent        Effect on ECCS                    Remarks and Other C
3                                                            Local Effects      Detection    Compensating                                      Effects e                                                            Including                        Provision
  =*                                                          Dependent Failures 40.3.a  EF        Close              Electrical failure    Degrade logic. 1    Periodic Test EFW Train A & B Train A Logic degraded FS1 (LO)                                              of 2 close signals                available Contact                                                permanently in 2-3                                                    after Hi flow 40.0.b  EF        Open              Electrical failure    Degraded logic      Periodic Test EFW Train A & B Train A Logic degrade from 2/3 to FS1(Hi)                                                Loss of                          available      2/2 Contact                                                3EF-66-FS1 9-10 40.1.b  EF        Close              Electrical failure    Degraded logic. 1  Periodic Test EFW Train A & B Train A Logic degrade from 2/3 to FS1(Hi)                                                of 2 close signals                available      1/2 permanently in Contact                                                place 9-10 40.2.b  EF        Open              Electrical failure    Degraded logic      Periodic Test EFW Train A & B Train A Logic degrade from 2/3 to FS1 (LO)                                              Loss of seal to                  available      2/2 Contact                                                3EF-66-FS1 2-3 40.3.b  EF        Close              Electrical failure    Degrade logic. 1    Periodic Test EFW Train A & B Train A Logic degrade from 2/3 to FS1 (LO)                                              of 2close signals                available      2/2 Contact                                                permanently in place after Hi flow 2-3 40.0.c  EF        Open              Electrical failure    Degraded logic      Periodic Test EFW Train A & B Train A Logic degraded from 2/3 FS1(Hi)                                                Loss of                          available      to 2/2 Contact                                                3EF-64-FS1 9-10 40.1 .c EF        Close              Electrical failure    Degraded logic. 1  Periodic Test EFW Train A & B Train A Close Logic degraded FS1(Hi)                                                of 2 close signals                available      from 2/3 to 1/2; No change to 2/2 permanently in                                    Open Logic Contact                                                place 3EF        9-10                                                    S1 energized (1)    "a" denotes flow through the cavitating venturi of >350 GPM "b" denotes flow through the cavitating venturi of >250 GPM <350 GPM increasing "c" denotes flow through the cavitating venturi of >250 GPM <350 GPM decreasing
 
U. S. Nuclear Regulatory Commission                                                                                                                      Enclosure 4 3F0811-02                                                                                                                                                Page 9 of 37 zr-  Name          Failure Mode      Cause                Symptoms and      Method of    Inherent        Effect on ECCS                    Remarks and Other 3                                                          Local Effects      Detection    Compensating                                      Effects Including                        Provision Dependent Failures 40.2.c EF        Open              Electrical failure    Degraded logic    Periodic Test EFW Train A & B Train A Logic degraded from 2/3 FS1 (LO)                                              Loss of seal to                  available      to 2/2 Contact 3EF-64-FS1 2-3 40.3.c EF        Close              Electrical failure    Degraded logic. 1  Periodic Test EFW Train A & B Train A Close Logic degraded FS1 (LO)                                              of 2 close signals              available      from 2/3 to 1/2; No change to 2/2 Contact                                                in place w/250                                  Open Logic gpm flow 2-3 41.0.a EF        Open              Electrical failure    Degraded logic. Periodic Test EFW Train A & B Train A Logic degraded from 2/3 FS2(Hi)                                                Loss of                          available      to 2/2 Contact 3EF-64-FS1 9-10 41.1.a EF        Close              Electrical failure    Degraded logic. 1  Periodic Test EFW Train A & B Train A Logic degraded from 2/3 FS2(Hi)                                                of 2 close signals              available      to 1/2 permanently in Contact                                                place 9-10 41.2.a EF        Open              Electrical failure    Degraded logic    Periodic Test EFW Train A & B Train A Logic degraded FS2(LO)                                                Loss of seal to                  available Contact                                                3EF-64-FS1 2-3 41.3.a EF        Close              Electrical failure    Degrade logic. 1  Periodic Test EFW Train A & B Train A Logic degraded FS2(LO)                                                of 2 close signals              available Contact                                                permanently in after Hi flow 2-3 41.0.b EF        Open              Electrical failure    Degraded logic. Periodic Test EFW Train A & B Train A Logic degrade from 2/3 to FS2(Hi)                                                Loss of                          available      2/2 Contact 3EF-66-FS 1 9-10 41.1.b EF        Close              Electrical failure    Degraded logic. 1  Periodic Test EFW Train A & B Train A Logic degrade from 2/3 to FS2(Hi)                                                of 2 close signals              available      1/2 permanently in Contact                                                place al 9-10 (1)    "a" denotes flow through the cavitating venturi of >350 GPM "b" denotes flow through the cavitating venturi of >250 GPM <350 GPM increasing "c" denotes flow through the cavitating venturi of >250 GPM <350 GPM decreasing
 
U. S. Nuclear Regulatory Commission                                                                                                                          Enclosure 4 3F0811-02                                                                                                                                                  Page 10 of 37 Z    Name          Failure Mode      Cause                Symptoms and        Method of    Inherent        Effect on ECCS                    Remarks and Other Local Effects      Detection    Compensating                                      Effects Including                        Provision
  -*                                                          Dependent Failures 41.2.b  EF        Open              Electrical failure    Degraded logic      Periodic Test EFW Train A & B Train A Logic degrade from 2/3 to FS2(LO)                                                Loss of seal to                  available      2/2 Contact                                                3EF-66-FS1 2-3 41.3.b  EF        Close              Electrical failure    Degirade logic. 1  Periodic Test EFW Train A & B Train A Logic degrade from 2/3 to FS2(LO)                                                of 2 close signals                available      1/2 for after HI flow Contact                                                permanently in place after Hi flow 2-3 41.0.c  EF        Open              Electrical failure    Degraded logic. Periodic Test EFW Train A & B Train A Logic degraded from 2/3 FS2(Hi)                                                Loss of                          available      to 2/2 Contact                                                3EF-64-FS2 9-10 41.1 .c EF        Close              Electrical failure    Degraded logic. 1  Periodic Test EFW Train A & B Train A Close Logic degraded FS2(Hi)                                                of 2 close signals                available      from 2/3 to 1/2; No change to 2/2 permanently in                                    Open Logic Contact                                                place 3EF        9-10                                                    S2 energized 41.2.c  EF        Open              Electrical failure    Degraded logic      Periodic Test EFW Train A & B Train A Logic degraded from 2/3 FS2(LO)                                                Loss of seal to                  available      to 2/2 Logic degrade from 2/3 to Contact                                                3EF-64-FS2                                        2/2 2-3 41.3.c  EF        Close              Electrical failure    Degraded logic. 1  Periodic Test EFW Train A & B Train A Close Logic degraded FS2(LO)                                                of 2 close signals                available      from 2/3 to 1/2; No change to 2/2 Contact                                                in place w/250                                    Open Logic gpm flow 2-3 42.0.a  EF        Open              Electrical failure    Degrade logic.      Periodic Test EFW Train A & B Train A Logic degraded from 2/3 FS3(Hi)                                                Loss of                          available      to 2/2 Contact 3EF-64-FS1 9-10 42.1 .a EF        Close              Electrical failure    Degraded logic. 1  Periodic Test EFW Train A & B Train A Logic degraded from 2/3 FS3(Hi)                                                of 2 close signals                available      to 1/2 permanently in Contact                                                place 9-10 (1)    "a" denotes flow through the cavitating venturi of >350 GPM "b" denotes flow through the cavitating venturi of >250 GPM <350 GPM increasing "c" denotes flow through the cavitating venturi of >250 GPM <350 GPM decreasing
 
U. S. Nuclear Regulatory Commission                                                                                                                          Enclosure 4 3F0811-02                                                                                                                                                  Page 11 of 37 Z
C      Name          Failure Mode      Cause                Symptoms and      Method of    Inherent        Effect on ECCS                    Remarks and Other 3                                                            Local Effects      Detection    Compensating                                      Effects
    -                                                          Including                        Provision
  -Dependent Failures 42.2.a  EF        Open              Electrical failure    Degraded logic    Periodic Test EFW Train A & B Train A Logic degraded FS4(LO)                                                Loss of seal to                  available Contact                                                3EF-64-FS1 2-3 42.3.a  EF        Close              Electrical failure    Degrade logic. 1  Periodic Test EFW Train A & B Train A Logic degraded FS3(LO)                                                of 2 close signals              available Contact                                                permanently in after Hi flow 2-3 42.0.b  EF        Open              Electrical failure    Degrade logic. Periodic Test EFW Train A & B Train A Logic degrade from 2/3 to FS3(Hi)                                                Loss of                          available      2/2 Contact                                                3EF-66-FS1 9-10 42.1 .b  EF        Close              Electrical failure    Degraded logic. 1  Periodic Test EFW Train A & B Train A Logic degrade from 2/3 to FS3(Hi)                                                of 2 close signals              available      1/2 permanently in Contact                                                place al 9-10 42.2.b  EF        Open              Electrical failure    Degraded logic    Periodic Test EFW Train A & B Train A Logic degrade from 2/3 to FS4(LO)                                                Loss of sealto                  available      1/2 after HIflow Contact                                                3EF-66-FS1 2-3 42.3.b  EF        Close              Electrical failure    Degrade logic. 1  Periodic Test EFW Train A & B Train A Logic degrade from 2/3 to FS3(LO)                                                of 2 close signals              available      1/2 for after HI flow Contact                                                permanently in place after Hiflow 2-3 42.0.c  EF        Open              Electrical failure    Degrade logic. Periodic Test EFW Train A & B EF-64-FS3(Hi) Contact FS3(Hi)                                                Loss of                          available Contact                                                3EF-64-FS3                                      9-10 9-10 42.1 .c  EF        Close              Electrical failure    Degraded logic. 1  Periodic Test EFW Train A & B Train A Close Logic degraded FS3(Hi)                                                of 2 close signals              available      from 2/3 to 1/2; go change to 2/2 permanently in                                  Open Logic Contact                                                place 3EF          9-10                                                    S3 energized (1)      "a" denotes flow through the cavitating venturi of >350 GPM "b" denotes flow through the cavitating venturi of >250 GPM <350 GPM increasing "c" denotes flow through the cavitating venturi of >250 GPM <350 GPM decreasing
 
U. S. Nuclear Regulatory Commission                                                                                                                                    Enclosure 4 3F0811-02                                                                                                                                                            Page 12 of 37 Z      Name          Failure Mode      Cause                Symptoms and        Method of        Inherent        Effect on ECCS                      Remarks and Other C              SLocal                                              Effects      Detection        Compensating                                        Effects (1                                                          Including                            Provision
  -Dependent Failures 42.2.c  EF        Open              Electrical failure    Degraded logic      Periodic Test    EFW Train A & B Train A Logic degraded from 2/3 FS3(LO)                                              Loss of seal to                      available      to 2/2 Contact 3EF-64-FS3 2-3 42.3.c  EF        Close            Electrical failure    Degraded logic. 1  Periodic Test    EFW Train A & B Train A Close Logic degraded FS3(LO)                                              of 2 close signals                    available      from 2/3 to 1/2; No change to 2/2 Contact                                                in place w/250                                        Open Logic gpm flow 2-3 43.0    SS/EFV-        Open              Electrical Failure    Loss of Remote      Periodic Test    EFW Train A & B Train A No Manual Open              For all flows through 179-SV                                                Manual Open                          available      capability from ControlRoom          cavitating venturi Contact 3-4                                            capability 43.1    SS/EFV-        Close            Electrical Failure    Loss of Automatic  Periodic Test    EFW Train B    A single (1 of 2) train would no    For all flows through 179-SV                                                Close of EFV-1 79                    available      longer be able to perform its            itating venturi Contact 3-4                                            20XB energized                                        design functions. The affected EFV-179 Opens                                        train s flow would be approximately 75% of design.
100% design flows are typically necessary only early in accidents.
The train with the failure will regain the ability to fully mitigate later in the accident scenario.
44.0    33o/EFV-      Open              Electrical Failure    Loss of Alarm for  Periodic Test    EFW Train A & B EFW Alarm Logic degraded            For all flows through 179 Contact                                          valve out of                          available                                            cavitating venturi c-d                                                    position.
44.1    33o/EFV-      Close            Electrical Failure    Nuisances Alarm    Annunciator Alarm EFW Train A & B EFW Alarm Logic degraded            For all flows through 179 Contact                                          2EFV-179                              available c-d                                                    energized                                                                                  cavitating venturi 44.2    33o/EFV-      Open              Electrical Failure    False indication    Periodic Test;    EFW Train A & B Degraded valve position              For all flows through 179 Contact                                          for valve position. Operator          available      Indication                          cavitating venturi a-b                                                                        Validation 44.3    33o/EFV-      Close            Electrical Failure    False indication    Periodic Test;    EFW Train A & B Degraded valve position              For all flows through 179 Contact                                          for valve position. Operator          available      Indication                          cavitating venturi a-b                                                                        Validation 45.0    33c/EFV-      Open              Electrical Failure    Loss of Alarm for  Periodic Test    EFW Train A & B EFW Alarm Logic degraded            For all flows through 179 Contact                                          valve out of                          available                                            cavitating venturi a-b                                                    position.
(1)    "a" denotes flow through the cavitating venturi of >350 GPM "b" denotes flow through the cavitating venturi of >250 GPM <350 GPM increasing "c" denotes flow through the cavitating venturi of >250 GPM <350 GPM decreasing
 
U. S. Nuclear Regulatory Commission                                                                                                                            Enclosure 4 3F0811-02                                                                                                                                                    Page 13 of 37 Z      Name        Failure Mode      Cause                Symptoms and        Method of      Inherent        Effect on ECCS                  Remarks and Other Local Effects      Detection      Compensating                                    Effects C                                                            Including                          Provision
  -Dependent Failures 45.1    33c/EFV-    Close              Electrical Failure    False Alarm for    Periodic Test  EFW Train A & B EFW Alarm Logic degraded        For all flows through 179 Contact                                          valve out of                      available a-b                                                  position.                                                                          cavitating venturi 45.2    33c/EFV-    Open              Electrical Failure    False indication    Periodic Test; EFW Train A & B Degraded valve position        For all flows through 179 Contact                                          for valve position. Operator      available      Indication                      cavitating venturi a-b                                                                      Validation 45.3    33c/EFV-    Close              Electrical Failure    False indication    Periodic Test; EFW Train A & B Degraded valve position        For all flows through 179 Contact                                          for valve position. Operator      available      Indication                      cavitating venturi a-b                                                                      Validation 50.0    3EF-64-FS1  Fails to Energize  Electrical Failure    Degraded logic. Periodic Test  EFW Train A & B Train A Logic degraded from 2/3 For all flows through Loss of 1 close                    available      to 2/2                          cavitating venturi signal 50.1    3EF-64-FS1  Fails to          Electrical Failure    Degraded logic. 1  Periodic Test  EFW Train A & B Train A Logic degraded from 2/3 For all flows through Deenergize Close                        of I close signals                available      to 1/2                          cavitating venturi permanently in place 50.2    3EF-64-FS1  Open              Electrical Failure    Degraded logic. Periodic Test  EFW Train A & B Train A Logic degraded          For all flows through Contact 1-2                                          Loss of Seal-in of                available 3EF-64-FS 1                                                                        cavitating venturi 50.3    3EF-64-FS1  Close              Electrical Failure    Degraded logic. 1  Periodic Test  EFW Train A & B Train A Logic degraded from 2/3 For all flows through Contact 1-2                                          of 2 close signals                available      to 1/2                          cavitating venturi permanently in place 50.4    3EF-64-FS1  Open              Electrical Failure    Degraded logic. Periodic Test  EFW Train A & B Train A Logic degraded from 2/3 For all flows through Contact 7-8                                          Loss of 1 close                    available      to 2/2 signal                                                                            cavitating venturi 50.5    3EF-64-FS1  Close              Electrical Failure    De raded logic. 1  Periodic Test  EFW Train A & B Train A Logic degraded from 2/3 For all flows through Contact 7-8                                          of 2 close signals                available      to 1/2                          cavitating venturi permanently in place 50.6    3EF-64-FS1  Open              Electrical Failure    Degraded logic. Periodic Test  EFW Train A & B Train A Logic degraded from 2/3 For all flows through Contact 9-                                            Loss of 1 close                    available      to 2/2 10                                                    signal                                                                            cavitating venturi (1)    "a" denotes flow through the cavitating venturi of >350 GPM "b" denotes flow through the cavitating venturi of >250 GPM <350 GPM increasing "c" denotes flow through the cavitating venturi of >250 GPM <350 GPM decreasing
 
U. S. Nuclear Regulatory Commission                                                                                                                          Enclosure 4 3F0811-02                                                                                                                                                  Page 14 of 37 Z    Name          Failure Mode      Cause                Symptoms and        Method of    Inherent        Effect on ECCS                  Remarks and Other Local Effects      Detection    Compensating                                    Effects
    -                                                        Including                        Provision Dependent Failures 50.7  3EF-64-FS1    Close              Electrical Failure    Degraded logic. 1  Periodic Test EFW Train A & B Train A Logic degraded from 2/3 For all flows through Contact 9-                                            of 2 close signals                available      to 1/2                          cavitating venturi 10                                                    permanently in place 50.8  3EF-64-FS1    Open              Electrical Failure    Degraded alarm      Periodic Test EFW Train A & B EFW Alarm Logic degraded        For all flows through Contact 3-4                                            logic. Loss of 1                  available                                      cavitating venturi close signal 50.9  3EF-64-FS1    Close              Electrical Failure    Degraded alarm      Periodic Test EFW Train A & B EFW Alarm Logic degraded        For all flows through Contact 3-4                                            logic. 1 of 2 close              available                                      cavitating venturi signals permanently in place 50.10  3EF-64-FS1    Open              Electrical Failure    Degraded alarm      Periodic Test EFW Train A & B EFW Alarm Logic degraded        For all flows through Contact 5-6                                            logic. Loss of 1                  available                                      cavitating venturi close signal 50.11  3EF-64-FS1    Close              Electrical Failure    Degraded alarm      Periodic Test EFW Train A & B EFW Alarm Logic degraded        For all flows through Contact 5-6                                            logic. 1 of 2 close              available                                      cavitating venturi signals permanently in place 51.0  3EF-64-FS2    Fails to Energize  Electrical Failure    Degraded logic. Periodic Test EFW Train A & B Train A Logic degraded from 2/3 For all flows through Loss of 1 close                  available      to 2/2                          cavitating venturi signal 51.1  3EF-64-FS2    Fails to          Electrical Failure    Degraded logic. 1  Periodic Test EFW Train A & B Train A Logic degraded from 2/3 For all flows through Deenergize                              of 2 close signals                available      to 1/2                          cavitating venturi permanently in place 51.2  3EF-64-FS2    Open              Electrical Failure    Degraded logic. Periodic Test EFW Train A & B Train A Logic degraded          For all flows through Contact 1-2                                            Loss of Seal-in of                available                                      cavitating venturi 3EF-64-FS1 51.3  3EF-64-FS2    Close              Electrical Failure    Degraded logic. 1  Periodic Test EFW Train A & B Train A Logic degraded from 2/3 For all flows through Contact 1-2                                            of 2 close signals                available      to 1/2                          cavitating venturi permanently in place 51.4  3EF-64-FS2    Open              Electrical Failure    Degraded logic. Periodic Test EFW Train A & B Train A Logic degraded from 2/3 For all flows through Contact 7-8                                            Loss of 1 close                  available      to 2/2 signal                                                                            cavitating venturi (1)    "a" denotes flow through the cavitating venturi of >350 GPM "b" denotes flow through the cavitating venturi of >250 GPM <350 GPM increasing "c" denotes flow through the cavitating venturi of >250 GPM <350 GPM decreasing
 
U. S. Nuclear Regulatory Commission                                                                                                                            Enclosure 4 3F0811-02                                                                                                                                                    Page 15 of 37 Z
c      Name          Failure Mode      Cause                Symptoms and        Method of    Inherent        Effect on ECCS                  Remarks and Other Local Effects      Detection    Compensating                                    Effects Including                        Provision
  -Dependent Failures 51.5    3EF-64-FS2    Close              Electrical Failure    Degraded logic. 1  Periodic Test EFW Train A & B Train A Logic degraded from 2/3 For all flows through Contact 7-8                                            of 2 close signals                available      to 1/2                          cavitating venturi permanently in place 51.6    3EF-64-FS2    Open              Electrical Failure    Degraded logic. Periodic Test EFW Train A & B Train A Logic degraded from 2/3 For all flows through Contact 9-                                            Loss of 1 close                  available      to 2/2                          cavitating venturi 10                                                    signal 51.7    3EF-64-FS2    Close              Electrical Failure    Degraded logic. 1  Periodic Test EFW Train A & B Train A Logic degraded from 2/3 For all flows through Contact 9-                                            of 2 close signals                available      to 1/2                          cavitating venturi 10                                                    permanently in place 51.8    3EF-64-FS2    Open              Electrical Failure    Degraded alarm      Periodic Test EFW Train A & B EFW Alarm Logic degraded        For all flows through Contact 3-4                                            logic. Loss of 1                  available                                      cavitating venturi close signal 51.9    3EF-64-FS2    Close              Electrical Failure    Degraded alarm      Periodic Test EFW Train A & B EFW Alarm Logic degraded        For all flows through Contact 3-4                                            logic. 1 of 2 close              available                                      cavitating venturi signals permanently in place 51.10    3EF-64-FS2    Open              Electrical Failure    Degraded alarm      Periodic Test EFW Train A & B EFW Alarm Logic degraded        For all flows through Contact 5-6                                            logic. Loss of 1                  available                                      cavitating venturi close signal 51.11    3EF-64-FS2    Close              Electrical Failure    Degraded alarm      Periodic Test EFW Train A & B EFW Alarm Logic degraded        For all flows through Contact 5-6                                            logic. 1 of 2 close              available                                      cavitating venturi signals permanently in place 52.0    3EF-64-FS2    Fails to Energize  Electrical Failure    Degraded logic. Periodic Test EFW Train A & B Train A Logic degraded from 2/3 For all flows through Loss of 1 close                  available      to 2/2                          cavitating venturi signal 52.1    3EF-64-FS2    Fails to          Electrical Failure    Degraded logic. 1  Periodic Test EFW Train A & B Train A Logic degraded from 2/3 For all flows through Deenergize                              of 2 close signals                available      to 1/2                          cavitating venturi permanently in place 52.2    3EF-64-FS3    Open              Electrical Failure    Degraded logic. Periodic Test EFW Train A & B Train A Logic degraded          For all flows through Contact 1-2                                            Loss of Seal-in of                available 3EF-64-FS1                                                                        cavitating venturi (1)      "a" denotes flow through the cavitating venturi of >350 GPM "b" denotes flow through the cavitating venturi of >250 GPM <350 GPM increasing "c" denotes flow through the cavitating venturi of >250 GPM <350 GPM decreasing
 
U. S. Nuclear Regulatory Commission                                                                                                                          Enclosure 4 3F0811-02                                                                                                                                                  Page 16 of 37 Z
C    Name          Failure Mode      Cause                Symptoms and        Method of    Inherent        Effect on ECCS                  Remarks and Other Local Effects      Detection    Compensating                                    Effects g                                                          Including                        Provision
  =*                                                          Dependent Failures 52.3  3EF-64-FS3    Close              Electrical Failure    Degraded logic. 1  Periodic Test EFW Train A & B Train A Logic degraded from 2/3 For all flows through Contact 1-2                                            of 2 close signals                available      to 1/2                          cavitating venturi permanently in place 52.4  3EF-64-FS3    Open              Electrical Failure    Degraded logic. Periodic Test EFW Train A & B Train A Logic degraded from 2/3 For all flows through Contact 7-8                                            Loss of 1 close                  available      to 2/2 signal                                                                            cavitating venturi 52.5  3EF-64-FS3    Close              Electrical Failure    Degraded logic. 1  Periodic Test EFW Train A & B Train A Logic degraded from 2/3 For all flows through Contact 7-8                                            of 2 close signals                available      to 1/2                          cavitating venturi permanently in place 52.6  3EF-64-FS3    Open              Electrical Failure    Degraded logic. Periodic Test EFW Train A & B Train A Logic degraded from 2/3 For all flows through Contact 9-                                            Loss of 1 close                  available      to 2/2 10                                                    signal                                                                            cavitating venturi 52.7  3EF-64-FS3    Close              Electrical Failure    Degraded logic. 1  Periodic Test EFW Train A & B Train A Logic degraded from 2/3 For all flows through Contact 9-                                            of 2 close signals                available      to 1/2                          cavitating venturi 10                                                    permanently in place 52.8  3EF-64-FS3    Open              Electrical Failure    Degraded alarm      Periodic Test EFW Train A & B EFW Alarm Logic degraded        For all flows through Contact 3-4                                            logic. Loss of 1                  available                                      cavitating venturi close signal 52.9  3EF-64-FS3    Close              Electrical Failure    Degraded alarm      Periodic Test EFW Train A & B EFW Alarm Logic degraded        For all flows through Contact 3-4                                            logic. 1 of 2 close              available                                      cavitating venturi signals permanently in place 52-10  3EF-64-FS3    Open              Electrical Failure    Degraded alarm      Periodic Test EFW Train A & B EFW Alarm Logic degraded        For all flows through Contact 5-6                                            logic. Loss of 1                  available                                      cavitating venturi close signal 52-11  3EF-64-FS3    Close              Electrical Failure    Degraded alarm      Periodic Test EFW Train A & B EFW Alarm Logic degraded        For all flows through Contact 5-6                                            logic. 1 of 2 close              available                                      cavitating venturi signals permanently in place 53.0  20XB          Fails to Energize  Electrical Failure    Loss of Remote      Periodic Test EFW Train A & B Train A No Manual Open          For all flows through Manual Open                      available      capability from Control Room    cavitating venturi capability (1)    "a" denotes flow through the cavitating venturi of >350 GPM "b" denotes flow through the cavitating venturi of >250 GPM <350 GPM increasing "c" denotes flow through the cavitating venturi of >250 GPM <350 GPM decreasing
 
U. S. Nuclear Regulatory Commission                                                                                                                                    Enclosure 4 3F0811-02                                                                                                                                                            Page 17 of 37 Z
C Name        Failure Mode      Cause                Symptoms and      Method of        Inherent        Effect on ECCS                          Remarks and Other Local Effects    Detection        Compensating                                            Effects 0                                                            Including                          Provision
  -Dependent Failures 53.1    20XB          Fails to          Electrical Failure    Loss of Automatic Periodic Test    EFW Train B    A single (1 of 2 train would no        For all flows through Deenergize                              Close of EFV-179                    available      longer be able to perform its 20XB energized                                      design functions. The affected          cavitating venturi EFV-179 Opens                                      train s flow would be approximately      75% of design.
100% design flows are typically necessary only early in accidents.
The train with the failure will regain the ability to fully mitigate later in the accident scenario.
53.2    20XB          Open              Electrical Failure    Loss of Automatic Periodic Test    EFW Train B    A single (1 of 2) train would no        For all flows through Contact 5-6                                            Close of EFV-179                    available      longer be able to perform its EFV-179 Opens                                      design functions. The affected          cavitating venturi train s flow would be approximately 75% of design.
100% design flows are typically necessary onl early in accidents.
The train with the failure will regain later in the the ability accidentto fully mitigate scenario.
53.4    20XB          Close              Electrical Failure    Loss of Remote    Periodic Test    EFW Train A & B Train A No Manual Open                  For all flows through Contact 5-6                                            Manual Open                        available      capability from Controi Room            cavitating venturi capability 53.5    20XB          Open              Electrical Failure    Loss of Alarm    Periodic Test    EFW Train A & B EFW Alarm Logic degraded                For all flows through Contact 1-2                                            Initiation signal                  available                                              cavitating venturi 53.6    20XB          Close              Electrical Failure    Nuisances Alarm  Annunciator Alarm EFW Train A & B EFW Alarm Logic degraded                For all flows through Contact 1-2                                            2EFV-179                            available energized                                                                                  cavitating venturi 54.0    20XA          Fails to Energize  Electrical Failure    Loss of Alarm for Periodic Test    EFW Train A & B EFW Alarm Logic degraded                For all flows through valve out of                        available                                                          venturi position.                                                                                  cavitating 54.1    20XA          Fails to          Electrical Failure    Nuisances Alarm  Annunciator Alarm EFW Train A & B EFW Alarm Logic degraded                For all flows through Deenergize                              when valve closes                  available                                              cavitating venturi 2EFV-1 79 energized 54.2    20XA          Open              Electrical Failure    Loss of Alarm for Periodic Test    EFW Train A & B EFW Alarm Logic degraded                For all flows through Contact 5-6                                            valve out of                        available                                              cavitating venturi position.
(1)    "a" denotes flow through the cavitating venturi of >350 GPM "b" denotes flow through the cavitating venturi of >250 GPM <350 GPM increasing "c" denotes flow through the cavitating venturi of >250 GPM <350 GPM decreasing
 
U. S. Nuclear Regulatory Commission                                                                                                                                    Enclosure 4 3F0811-02                                                                                                                                                            Page 18 of 37 Z      Name          Failure Mode      Cause                Symptoms and      Method of        Inherent        Effect on ECCS                      Remarks and Other C
3                                                              Local Effects    Detection        Compensating                                        Effects e"Including                                                                                        Provision
  =Dependent Failures 54.3      20XA          Close              Electrical Failure    Nuisances Alarm  Annunciator Alarm EFW Train A & B EFW Alarm Logic degraded            For all flows through Contact 5-6                                            when valve closes                  available 2EFV-179                                                                                cavitating venturi energized 54.4      20XA          Open              Electrical Failure    Loss of Alarm for Periodic Test    EFW Train A & B EFW Alarm Logic degraded            For all flows through Contact 9-                                            valve out of                        available 10                                                    position.                                                                                cavitating venturi 54.6      20XA          Close              Electrical Failure    Nuisances Alarm  Annunciator Alarm EFW Train A & B EFW Alarm Logic degraded            For all flows through Contact 9-                                            2EFV-179                            available 10                                                    energized                                                                                cavitating venturi 55.0      2EFV-1 79    Fails to Energize  Electrical Failure    Loss of Alarm    Periodic Test    EFW Train A & B EFW Alarm Logic degraded            For all flows through available                                            cavitating venturi 55.1      2EFV-179      Fails to          Electrical Failure    Nuisances Alarm  Annunciator Alarm EFW Train A & B EFW Alarm Logic degraded            For all flows through Deenergize                              2EFV-179                            available energized                                                                                cavitating venturi 55.2      2EFV-179      Open              Electrical Failure    Loss of Alarm    Periodic Test    EFW Train A & B EFW Alarm Logic degraded            For all flows through Contact 1-5                                                                                available                                            cavitating venturi 55.3      2EFV-179      Close              Electrical Failure    Nuisances Alarm  Annunciator Alarm EFW Train A & B EFW Alarm Logic degraded            For all flows through Contact 1-5                                            2EFV-179                            available energized                                                                                cavitating venturi EFV-179-      Fails to Energize  Electrical Failure    Valve remains in  Periodic Test    EFW Train B    A single (1 of 2) train would no    For all flows through SV                                                    Open position                      available      longer be able to perform its design functions. The affected      cavitating venturi 56.0.
train s flow would be approximately 75% of design.
100% design flows are typically necessary only early in accidents.
The train with the failure will regain the ability to fully mitigate later in the accident scenario.
(1)      "a" denotes flow through the cavitating venturi of >350 GPM "b" denotes flow through the cavitating venturi of >250 GPM <350 GPM increasing "c" denotes flow through the cavitating venturi of >250 GPM <350 GPM decreasing
 
U. S. Nuclear Regulatory Commission                                                                                                                                    Enclosure 4 3F0811-02                                                                                                                                                            Page 19 of 37 Z
C Name          Failure Mode      Cause                Symptoms and    Method of        Inherent        Effect on ECCS                      Remarks and Other Local Effects    Detection        Compensating                                        Effects o"Including                                                                                      Provision
  -Dependent Failures 56.1      EFV-1 79-    Fails to          Electrical Failure    Valve remains in Periodic Test    EFW Train B    A single (1 of 2) train would no    For all flows through SV            Deenergize                              Closed Position                    available      longer be able to perform its design functions. The affected      cavitating venturi train s flow would be approximately 75% of design.
100% design flows are typically necessary only early in accidents.
The train with The failure will regain the ability to fully mitigate later in the accident scenario.
DPDP-1 D      Blown Fuse        Electrical Failure    Loss of          Periodic Test    EFW Train B    A single (1 of 2 train would no      For all flows through control/motive                    available      longer be able to perform its              ting venturi 57.0                                                              power for                                          design functions. The affected      cavita train s flow would be EFV-179                                            approximately 75% of design.
100% design flows are typically necessary only early in accidents.
The train with the failure will regain the ability to fully mitigate later in the accident scenario.
58.0      2EFV-179/A    Fails to Energize  Electrical Failure    Nuisance Alarm  Annunciator Alarm EFW Train A & B EFW Alarms degraded                  For all flows through available                                            cavitating venturi 58.1      2EFV-179/A    Fails to          Electrical Failure    Loss of Alarm    Periodic Test    EFW Train A & B EFW Alarms degraded                  For all flows through Deenergize                                                                  available                                            cavitating venturi 58.2      2EFV-179/A    Open              Electrical Failure    Loss of Alarm    Periodic Test    EFW Train A & B EFW Alarms degraded                  For all flows through Contact                                                                                  available                                            cavitating venturi 1-5 58.3      2EFV-1 79/A  Close              Electrical Failure    Nuisances Alarm  Annunciator Alarm EFW Train A & B available      EFW Alarms degraded                  For all flows through Contact                                                                                                                                        cavitating venturi 1-5 60.1      EF-62-FS1,    Fails High        Electrical or        Affects either  Periodic Test    Redundant      Logic degraded from 2/3 to 2/2 to    Mode: High Flow Setpoint FS2, FS3                        mechanical failure                                      component      open EFV-180                        actuated with Low Flow (Any 1 of 3)                                          EF-62-FS1, FS2,                                                                        Setpoint reset. (EFV-180 or FS3                                                                                  closed)
(1)        "a" denotes flow through the cavitating venturi of >350 GPM "b" denotes flow through the cavitating venturi of >250 GPM <350 GPM increasing "c" denotes flow through the cavitating venturi of >250 GPM <350 GPM decreasing
 
U. S. Nuclear Regulatory Commission                                                                                                                          Enclosure 4 3F081 1-02                                                                                                                                                Page 20 of 37 z        Name          Failure Mode      Cause                Symptoms and      Method of    Inherent    Effect on ECCS                    Remarks and Other E3                                                              Local Effects    Detection    Compensating                                  Effects o-Including                                                                                      Provision I                                                              Dependent zFailures 60.2        EF-62-FS1,    Fails Low          Electrical or        Affects either    Periodic Test Redundant    Logic degraded from 2/3 to 1/2 to Mode: High Flow Setpoint FS2, FS3                        mechanical failure                                    component    open EFV-180                      actuated with Low Flow (Any 1 of 3)                                          EF-62-FS1, FS2,                                                                Setpoint reset. (EFV-180 or FS3                                                                        closed) 60.3        EF-62-FS1,    Fails Constant    Electrical or        Affects either    Periodic Test Redundant    Logic degraded from 2/3 to 2/2 to Mode: High Flow Setpoint FS2, FS3                        mechanical failure                                    component    open EFV-180                      actuated with Low Flow (Any 1 of 3)                                          EF-62-FS1, FS2,                                                                Setpoint reset. (EFV-180 or FS3                                                                        closed) 61.1        EF-62-FS1,    Fails High        Electrical or        Affects either    Periodic Test Redundant    Logic degraded from 2/3 to 1/2 to Mode: Low Flow Setpoint FS2,FS3                          mechanical failure                                    component    close EFV-180                    actuated with High Flow (Any 1 of 3)                                          EF-62-FS1, FS2,                                                                Setpoint reset. (EFV-180 or FS3                                                                        open) 61.2        EF-62-FS1,    Fails Low          Electrical or        Affects either    Periodic Test Redundant    Logic degraded from 2/3 to 2/2 to Mode: Low Flow Setpoint FS2,FS3                          mechanical failure                                    component    close EFV-180                    actuated with High Flow (Any 1 of 3)                                          EF-62-FS1, FS2,                                                                Setpoint reset. (EFV-180 or FS3                                                                        open) 61.3        EF-62-FS1,    Fails Constant    Electrical or        Affects either    Periodic Test Redundant    Logic degraded from 2/3 to 2/2 to Mode: Low Flow Setpoint FS2,FS3                          mechanical failure                                    component    close EFV-180                    actuated with High Flow (Any 1 of 3)                                          EF-62-FS1, FS2,                                                                Setpoint reset. (EFV-180 or FS3                                                                        open) 62.1        EF-62-FS1,    Leakage at        Mechanical Failure    Affects either    Periodic Test Redundant    Logic degraded from 2/3 to 2/2 to Mode: High Flow Setpoint FS2, FS3      pressure                                                                component    open EFV-180                      actuated with Low Flow (Any 1 of 3)  boundary  - Low                        EF-62-FS1,  FS2,                                                              Setpoint reset.
Side                                    or FS3 (EFV-1 80 closed)
(Fails High) 62.2        EF-62-FS1,    Leakage at        Mechanical Failure    Affects either    Periodic Test Redundant    Logic degraded from 2/3 to 1/2 to Mode: High Flow Setpoint FS2, FS3      pressure                                                                component    open EFV-180                      actuated with Low Flow (Any 1 of 3)  boundary  - High                        EF-62-FS1,  FS2,                                                              Setpoint reset.
Side                                    or FS3 (EFV-1 80 closed)
(Fails Low)
(1)        "a" denotes flow through the cavitating venturi of >350 GPM "b" denotes flow through the cavitating venturi of >250 GPM <350 GPM increasing "c" denotes flow through the cavitating venturi of >250 GPM <350 GPM decreasing
 
U. S. Nuclear Regulatory Commission                                                                                                                        Enclosure 4 3F0811-02                                                                                                                                              Page 21 of 37 zC      Name        Failure Mode      Cause                Symptoms and      Method of    Inherent    Effect on ECCS                    Remarks and Other Local Effects    Detection    Compensating                                  Effects o-                                                          Including                      Provision
  -Dependent Failures 63.1      EF-62-FS1,  Leakage at        Mechanical Failure    Affects either    Periodic Test Redundant    Logic degraded from 2/3 to 1/2 to Mode: Low Flow Setpoint FS2, FS3    pressure                                                                component    close EFV-180                    actuated with High Flow (Any 1 of 3) boundary  - Low                        EF-62-FS1,  FS2,                                                              Setpoint reset.
Side                                    or FS3 (EFV-1 80 open)
(Fails High) 63.2      EF-62-FS1,  Leakage at        Mechanical Failure    Affects either    Periodic Test Redundant    Logic degraded from 2/3 to 2/2 to Mode: Low Flow Setpoint FS2, FS3    pressure                                                                component    close EFV-180                    actuated with High Flow (Any 1 of 3) boundary  - High                        EF-62-FS1,  FS2,                                                              Setpoint reset.
Side                                    or FS3 (EFV-1 80 open)
(Fails Low) 64.1      EF-64-FS1,  Fails High        Electrical or        Affects either    Periodic Test Redundant    Logic degraded from 2/3 to 2/2 to Mode: High Flow Setpoint FS2, FS3                        mechanical failure                                    component    open EFV-179                      actuated with Low Flow (Any 1 of 3)                                          EF-64-FS1, FS2,                                                                Setpoint reset. (EFV-1 79 or FS3                                                                        closed) 64.2      EF-64-FS1,  Fails Low          Electrical or        Affects either    Periodic Test Redundant    Logic degraded from 2/3 to 1/2 to Mode: High Flow Setpoint FS2, FS3                        mechanical failure                                    component    open EFV-179                      actuated with Low Flow (Any 1 of 3)                                          EF-64-FS1, FS2,                                                                Setpoint reset. (EFV-179 or FS3                                                                        closed) 64.3      EF-64-FS1,  Fails Constant    Electrical or        Affects either    Periodic Test Redundant    Logic degraded from 2/3 to 2/2 to Mode: High Flow Setpoint FS2, FS3                        mechanical failure                                    component    open EFV-179                      actuated with Low Flow (Any 1 of 3)                                          EF-64-FS1, FS2,                                                                Setpoint reset. (EFV-1 79 or FS3                                                                        closed) 65.1      EF-64-FS1,  Fails High        Electrical or        Affects either    Periodic Test Redundant    Logic degraded from 2/3 to 1/2 to Mode: Low Flow Setpoint FS2,FS3                        mechanical failure                                    component    close EFV-179                    actuated with High Flow (Any 1 out                                            EF-64-FS1, FS2,                                                                Setpoint reset. (EFV-179 of 3)                                                or FS3                                                                        open) 65.2      EF-64-FS1,  Fails Low          Electrical or        Affects either    Periodic Test Redundant    Logic degraded from 2/3 to 2/2 to Mode: Low Flow Setpoint FS2,FS3                        mechanical failure                                    component    close EFV-1 79                    actuated with High Flow (Any 1 out                                            EF-64-FS1, FS2,                                                                Setpoint reset. (EFV-179 of 3)                                                or FS3                                                                        open)
(1)      "a" denotes flow through the cavitating venturi of >350 GPM "b" denotes flow through the cavitating venturi of >250 GPM <350 GPM increasing "c" denotes flow through the cavitating venturi of >250 GPM <350 GPM decreasing
 
U. S. Nuclear Regulatory Commission                                                                                                                        Enclosure 4 3F0811-02                                                                                                                                                Page 22 of 37 z      Name          Failure Mode      Cause                Symptoms and      Method of    Inherent    Effect on ECCS                    Remarks and Other Local Effects      Detection    Compensating                                  Effects g                                                            Including                        Provision
  -Dependent Failures 65.3    EF-64-FS1,    Fails Constant    Electrical or        Affects either    Periodic Test Redundant    Logic degraded from 2/3 to 2/2 to Mode: Low Flow Setpoint FS2,FS3                          mechanical failure                                    component    close EFV-179                    actuated with High Flow (Any 1 out                                            EF-64-FS1, FS2,                                                                Setpoint reset. (EFV-179 of 3)                                                  or FS3                                                                          open) 66.1    EF-64-FS1,    Leakage at        Mechanical Failure    Affects either    Periodic Test Redundant    Logic degraded from 2/3 to 2/2 to Mode: High Flow Setpoint FS2, FS3      pressure                                                                  component    open EFV-179                      actuated with Low Flow (Any 1 of 3)  boundary  - Low                          EF-64-FS1,  FS2,                                                              Setpoint reset.
Side                                    or FS3 (EFV-1 79 closed)
(Fails High) 66.2    EF-64-FS1,    Leakage at        Mechanical Failure    Affects either    Periodic Test Redundant    Logic degraded from 2/3 to 1/2 to Mode: High Flow Setpoint FS2, FS3      pressure                                                                  component    open EFV-179                      actuated with Low Flow (Any 1 of 3)  boundary  - High                        EF-64-FS1,    FS2,                                                              Setpoint reset.
Side                                    or FS3 (EFV-179 open)
(Fails Low) 67.1    EF-64-FS1,    Leakage at        Mechanical Failure    Affects either    Periodic Test Redundant    Logic degraded from 2/3 to 1/2 to Mode: Low Flow Setpoint FS2, FS3      pressure                                                                  component    close EFV-179                    actuated with High Flow (Any 1 of 3)  boundary  - Low                          EF-64-FS1,    FS2,                                                              Setpoint reset.
Side                                    or FS3 (EFV-179 open)
(Fails High) 67.2    EF-64-FS1,    Leakage at        Mechanical Failure    Affects either    Periodic Test Redundant    Logic degraded from 2/3 to 2/2 to Mode: Low Flow Setpoint FS2, FS3      pressure                                                                  component    close EFV-179                    actuated with High Flow (Any 1 of 3)  boundary  - High                        EF-64-FS1,    FS2,                                                              Setpoint reset.
Side                                    or FS3 (EFV-179 open)
(Fails Low) 70.1    EFV-139      Fail Open          Operational Mis-      Affects EF    Periodic Test EFW Train A  None                              High Side root valve of EF-position or          FS1, FS2,& FS3.                  available                                      62-FO. Mode: High Flow Mechanical Failure                                                                                    Setpoint actuated with Low Flow Setpoint reset. (EFV-180 closed)
(1)      "a" denotes flow through the cavitating venturi of >350 GPM "b" denotes flow through the cavitating venturi of >250 GPM <350 GPM increasing "c" denotes flow through the cavitating venturi of >250 GPM <350 GPM decreasing
 
U. S. Nuclear Regulatory Commission                                                                                                                    Enclosure 4 3F08 11-02                                                                                                                                          Page 23 of 37 z    Name          Failure Mode      Cause                Symptoms and    Method of          Inherent    Effect on ECCS              Remarks and Other C
3                                                          Local Effects  Detection          Compensating                              Effects Including                          Provision
  =*                                                          Dependent Failures 70.2  EFV-1 39      Fail Closed        Operational Mis-      EFV-180 opens. Periodic Test      EFW Train A  Will not auto-close EFV-1 80 High Side root valve of EF-position or                                              available    Cascades into 10.2          62-FO. Mode: High Flow Mechanical Failure    Affects EF  Red Light                                                    Setpoint actuated with Low FS1, FS2,& FS3. Indication for EFV-                                          Flow Setpoint reset. (EFV-180                                                          180 closed) 70.3  EFV-1 39      Fail Mid-Travel    Operational Mis-      Affects EF  Periodic Test      EFW Train A  None                        High Side root valve of EF-position or          FS1, FS2,& FS3.                    available                                62-FO.Mode: High Flow Mechanical Failure                                                                                  Setpoint actuated with Low Flow Setpoint reset. (EFV-180 closed) 71.1  EFV-139      Fail Open          Operational Mis-      Affects EF  Periodic Test      EFW Train A  None                        High Side root valve of EF-position or          FS1, FS2,& FS3.                    available                                62-FO. Mode: Low Flow Mechanical Failure                                                                                  Setpoint actuated with High Flow Setpoint reset. (EFV-180 open) 71.2  EFV-139      Fail Closed        Operational Mis-      Affects EF  Periodic Test      EFW Train A  Will not auto-close EFV-1 80 High Side root valve of EF-position or          FS1, FS2,& FS3.                    available    Cascades into 10.1          62-FO. Mode: Low Flow Mechanical Failure                                                                                  Setpoint actuated with High Flow Setpoint reset. (EFV-180 open) 71.3  EFV-139      Fail Mid-Travel    Operational Mis-      Affects EF  Periodic Test      EFW Train A  None                        High Side root valve of EF-position or          FS1, FS2,& FS3.                    available                                62-FO. Mode: Low Flow Mechanical Failure                                                                                  Setpoint actuated with High Flow Setpoint reset. (EFV-180 open) 72.1  EFV-140      Fail Open          Operational Mis-      Affects EF  Periodic Test      EFW Train A  None                        Low Side root valve of EF-position or          FS1, FS2,& FS3.                    available                                62-FO. Mode: High Flow Mechanical Failure                                                                                  Setpoint actuated with Low Flow Setpoint reset. (EFV-180 closed)
(1)    "a" denotes flow through the cavitating venturi of >350 GPM "b" denotes flow through the cavitating venturi of >250 GPM <350 GPM increasing "c" denotes flow through the cavitating venturi of >250 GPM <350 GPM decreasing
 
U. S. Nuclear Regulatory Commission                                                                                                                    Enclosure 4 3F0811-02                                                                                                                                            Page 24 of 37 zC  Name          Failure Mode      Cause                Symptoms and    Method of          Inherent    Effect on ECCS              Remarks and Other Local Effects    Detection          Compensating                            Effects Including                            Provision
  =*                                                        Dependent Failures 72.2  EFV-140      Fail Closed        Operational Mis-      Affects EF  Periodic Test      EFW Train A  Will not auto-open EFV-1 80 Low Side root valve of EF-position or          FS1, FS2,& FS3.                      available    Cascades into 10.2          62-FO. Mode: High Flow Mechanical Failure                                                                                  Setpoint actuated with Low Flow Setpoint reset. (EFV-180 closed) 72.3  EFV-140      Fail Mid-Travel    Operational Mis-      Affects EF  Periodic Test      EFW Train A  None                        Low Side root valve of EF-position or          FS1, FS2,& FS3.                      available                                62-FO. Mode: High Flow Mechanical Failure                                                                                  Setpoint actuated with Low Flow Setpoint reset. (EFV-180 closed) 73.1  EFV-140      Fail Open          Operational Mis-      Affects EF  Periodic Test      EFW Train A  None                        Low Side root valve of EF-position or          FS1, FS2,& FS3.                      available                                62-FO. Mode: Low Flow Mechanical Failure                                                                                  Setpoint actuated with High Flow Setpoint reset. (EFV-180 open) 73.2  EFV-140      Fail Closed        Operational Mis-      EFV-1 80 closes. Periodic Test      EFW Train A  Will not auto-open EFV-1 80 Low Side root valve of EF-position or          Affects EF                      available    Cascades into 10.2          62-FO. Mode: Low Flow Mechanical Failure    FS1, FS2,& FS3. Green Light                                                  Setpoint actuated with High Indication for EFV-                                          Flow Setpoint reset. (EFV-180                                                          180 open) 73.3  EFV-140      Fail Mid-Travel    Operational Mis-      Affects EF  Periodic Test      EFW Train A  None                        Low Side root valve of EF-position or          FS1, FS2,& FS3.                      available                                62-FO. Mode: Low Flow Mechanical Failure                                                                                  Setpoint actuated with High Flow Setpoint reset. (EFV-180 open) 74.1  EFV-181      Fail Open          Operational Mis-      Affects EF  Periodic Test      EFW Train B  None                        High Side root valve of EF-position or          FS1, FS2,& FS3.                      available                                64-FO. Mode: High Flow Mechanical Failure                                                                                  Setpoint actuated with Low Flow Setpoint reset. (EFV-179 closed)
(1)    "a" denotes flow through the cavitating venturi of >350 GPM "b" denotes flow through the cavitating venturi of >250 GPM <350 GPM increasing "c" denotes flow through the cavitating venturi of >250 GPM <350 GPM decreasing
 
U. S. Nuclear Regulatory Commission                                                                                                                      Enclosure 4 3F0811-02                                                                                                                                              Page 25 of 37 z    Name          Failure Mode      Cause                Symptoms and    Method of          Inherent    Effect on ECCS              Remarks and Other
    ,.
:                                                            Local Effects  Detection          Compensating                              Effects
      -                                                        Including                          Provision
  -*                                                            Dependent Failures 74.2    EFV-181      Fail Closed        Operational Mis-      EFV-1 79 opens. Periodic Test      EFW Train B  Will not auto-close EFV-1 80 High Side root valve of EF-position or          Affects EF                      available    Cascades into 10.1          64-FO. Mode: High Flow Mechanical Failure    FS1, FS2,& FS3. Red Light                                                    Setpoint actuated with Low Indication for EFV-                                          Flow Setpoint reset. (EFV-179                                                          179 closed) 74.3    EFV-1 81      Fail Mid-Travel    Operational Mis-      Affects EF  Periodic Test      EFW Train B  None                        High Side root valve of EF-position or          FS1, FS2,& FS3.                    available                                64-FO. Mode: High Flow Mechanical Failure                                                                                  Setpoint actuated with Low Flow Setpoint reset. (EFV-179 closed) 75.1    EFV-1 81      Fail Open          Operational Mis-      Affects EF  Periodic Test      EFW Train B  None                        High Side root valve of EF-position or          FS1, FS2,& FS3.                    available                                64-FO. Mode: Low Flow Mechanical Failure                                                                                  Setpoint actuated with High Flow Setpoint reset. (EFV-179 open) 75.2    EFV-181      Fail Closed        Operational Mis-      Affects EF  Periodic Test      EFW Train B  Will not auto-close EFV-1 79 High Side root valve of EF-position or          FS1, FS2,& FS3.                    available    Cascades into 1.1            64-FO. Mode: Low Flow Mechanical Failure                                                                                  Setpoint actuated with High Flow Setpoint reset.(EFV-179 open) 75.3    EFV-181      Fail Mid-Travel    Operational Mis-      Affects EF  Periodic Test      EFW Train B  None                        High Side root valve of EF-position or          FS1, FS2,& FS3.                    available                                64-FO. Mode: Low Flow Mechanical Failure                                                                                  Setpoint actuated with High Flow Setpoint reset.(EFV-179 open) 76.1    EFV-182      Fail Open          Operational Mis-      Affects EF  Periodic Test      EFW Train B  None                        Low Side root valve of EF-position or          FS1, FS2,& FS3.                    available                                64-FO. Mode: High Flow Mechanical Failure                                                                                  Setpoint actuated with Low Flow Setpoint reset. (EFV-179 closed)
(1)      "a" denotes flow through the cavitating venturi of >350 GPM "b" denotes flow through the cavitating venturi of >250 GPM <350 GPM increasing "c" denotes flow through the cavitating venturi of >250 GPM <350 GPM decreasing
 
U. S. Nuclear Regulatory Commission                                                                                                                        Enclosure 4 3F0811-02                                                                                                                                                Page 26 of 37 zC    Name          Failure Mode      Cause                Symptoms and      Method of    Inherent        Effect on ECCS                  Remarks and Other Local Effects      Detection    Compensating                                    Effects CD                                                          Including                        Provision
  =*                                                          Dependent Failures 76.2    EFV-182      Fail Closed        Operational Mis-      Affects EF    Periodic Test EFW Train B    Will not auto-open EFV-179      Low Side root valve of EF-position or          FS1, FS2,& FS3.                  available      Cascades into 1.2              64-FO.Mode: High Flow Mechanical Failure                                                                                    Setpoint actuated with Low Flow Setpoint reset. (EFV-179 closed) 76.3    EFV-1 82      Fail Mid-Travel    Operational Mis-      Affects EF    Periodic Test EFW Train B    None                            Low Side root valve of EF-position or          FS1, FS2,& FS3.                  available                                      64-FO. Mode: High Flow Mechanical Failure                                                                                    Setpoint actuated with Low Flow Setpoint reset. (EFV-179 closed) 77.1    EFV-182      Fail Open          Operational Mis-      Affects EF    Periodic Test EFW Train B    None                            Low Side root valve of EF-position or          FS1, FS2,& FS3.                  available                                      64-FO. Mode: Low Flow Mechanical Failure                                                                                    Setpoint actuated with High Flow Setpoint reset. (EFV-179 open) 77.2    EFV-1 82      Fail Closed        Operational Mis-      Affects EF    Periodic Test EFW Train B    Will not auto-open EFV-1 79    Low Side root valve of EF-position or          FS1, FS2,& FS3.                  available      Cascades into 1.2              64-FO. Mode: Low Flow Mechanical Failure                                                                                    Setpoint actuated with High Flow Setpoint reset. (EFV-179 open) 77.3    EFV-182      Fail Mid-Travel    Operational Mis-      Affects EF    Periodic Test EFW Train B    None                            Low Side root valve of EF-position or          FS1, FS2,& FS3.                  available                                      64-FO. Mode: Low Flow Mechanical Failure                                                                                    Setpoint actuated with High Flow Setpoint reset. (EFV-179 open) 140.Oa  EF        Open              Electrical failure    Degraded logic    Periodic Test EFW Train A & B Train B Logic degraded from 2/3 FS1(Hi)                                                Loss of                          available      to 2/2 Contact                                                3EF-62-FS1 9-10 140.1 a EF        Close              Electrical failure    Degraded logic. 1  Periodic Test EFW Train A & B Train B Logic degraded from 2/3 FS1 (Hi)                                              of 2 close signals              available      to 1/2 permanently in Contact                                                place 9-10 (1)    "a" denotes flow through the cavitating venturi of >350 GPM "b" denotes flow through the cavitating venturi of >250 GPM <350 GPM increasing "c" denotes flow through the cavitating venturi of >250 GPM <350 GPM decreasing
 
U. S. Nuclear Regulatory Commission                                                                                                                          Enclosure 4 3F0811-02                                                                                                                                                  Page 27 of 37 Z      Name          Failure Mode      Cause                Symptoms and      Method of    Inherent        Effect on ECCS                    Remarks and Other C                SLocal                                              Effects    Detection    Compensating                                      Effects o"Including                                                                                    Provision Dependent Failures 140.2a    EF        Open              Electrical failure    Degraded logic    Periodic Test EFW Train A & B Train B Logic degraded FS1 (LO)                                              Loss of seal to                  available Contact 2-3                                                    3EF-62-FS1 140.3a    EF        Close              Electrical failure    Degrade logic. 1  Periodic Test EFW Train A & B Train B Logic degraded FS1 (LO)                                              of 2 close signals              available Contact                                                permanently in 2-3                                                    after Hi flow 140.Ob    EF        Open              Electrical failure    Degraded logic    Periodic Test EFW Train A & B Train B Logic degraded from 2/3 FS1 (Hi)                                              Loss of 3EF-B2-                  available      to 2/2 Contact 9-                                            FS1 10 140.1 b  EF        Open              Electrical failure    Degraded logic    Periodic Test EFW Train A & B Train B Logic degraded FS1 (LO)                                              Loss of seal to                  available Contact 2-3                                            3EF-62-FS1 140.2b    EF        Close              Electrical failure    Degraded logic. 1  Periodic Test EFW Train A & B Train B Logic degraded from 2/3 FS1 (Hi)                                              of 2 close signals              available      to 1/2 Contact 9-                                            permanently in 10                                                    place 140.3b    EF        Close              Electrical failure    Degrade logic. 1  Periodic Test EFW Train A & B Train B Logic degraded FS1 (LO)                                              of 2 close signals              available Contact 2-3                                            permanently in after Hi flow 140.0c    EF        Open              Electrical failure    Degraded logic    Periodic Test EFW Train A & B Train B Logic degraded from 2/3 FS1 (Hi)                                              Loss of                          available      to 2/2 Contact                                                3EF-62-FS1 9-10 140.1 c  EF        Close              Electrical failure    Degraded logic. 1  Periodic Test EFW Train A & B Train B Close Logic degraded FS1 (Hi)                                              of 2 close signals              available      from 2/3 to 1/2; go change to 2/2 permanently in                                  Open Logic Contact                                                place 3EF          9-10                                                    S1 energized (1)      "a" denotes flow through the cavitating venturi of >350 GPM "b" denotes flow through the cavitating venturi of >250 GPM <350 GPM increasing "c" denotes flow through the cavitating venturi of >250 GPM <350 GPM decreasing
 
U. S. Nuclear Regulatory Commission                                                                                                                      Enclosure 4 3F0811-02                                                                                                                                              Page 28 of 37 z    Name          Failure Mode      Cause                Symptoms and      Method of    Inherent        Effect on ECCS                  Remarks and Other Local Effects      Detection    Compensating                                    Effects Including                        Provision
  -                                                            Dependent Failures 140.2c  EF        Open              Electrical failure    Degraded logic    Periodic Test EFW Train A & B Train B Logic degraded from 2/3 FS1 (LO)                                              Loss of seal to                  available      to 2/2 Contact                                                3EF-62-FS1 2-3 140.3c  EF        Open              Electrical failure    Degraded logic    Periodic Test EFW Train A & B Train B Logic degraded from 2/3 FS  1(LO)
Contact                                                Loss of seal to                  available      to 2/2 3EF-62-FS1 2-3 141.Oa  EF        Open              Electrical failure    Degraded logic. Periodic Test EFW Train A & B Train B Logic degraded from 2/3 FS2(Hi)
Contact                                                Loss of                          available      to 2/2 3EF-62-FS1 9-10 141 .la EF        Close              Electrical failure    Degraded logic. 1  Periodic Test EFW Train A & B Train B Logic degraded from 2/3 FS2(Hi)                                                of 2 close signals              available      to 1/2 permanently in Contact                                                place 9-10 141.2a  EF        Open              Electrical failure    Degraded logic    Periodic Test EFW Train A & B Train B Logic degraded FS2(LO)                                                Loss of seal o                  available Contact                                                3EF-62-FS1 2-3 141.3a  EF        Close              Electrical failure    Degrade logic. 1  Periodic Test EFW Train A & B Train B Logic degraded FS2(LO)                                                of 2 close signals              available Contact                                                permanently in after Hi flow 2-3 141.Ob  EF        Open              Electrical failure    Degraded logic. Periodic Test EFW Train A & B Train B Logic degraded from 2/3 FS2(Hi)                                                Loss of                          available      to 2/2 Contact 9-10                                                    3EF-62-FS1 141.1b  EF        Open              Electrical failure    Degraded logic    Periodic Test EFW Train A & B Train B Logic degraded FS2(LO)                                                Loss of seal to                  available Contact 2-3                                            3EF-62-FS1 (1)    "a" denotes flow through the cavitating venturi of >350 GPM "b" denotes flow through the cavitating venturi of >250 GPM <350 GPM increasing "c" denotes flow through the cavitating venturi of >250 GPM <350 GPM decreasing
 
U. S. Nuclear Regulatory Commission                                                                                                                              Enclosure 4 3F0811-02                                                                                                                                                      Page 29 of 37 z
C          Name          Failure Mode      Cause                Symptoms and      Method of    Inherent        Effect on ECCS                    Remarks and Other Local Effects      Detection    Compensating                                      Effects o"Including Provision
  =Dependent Failures 141.2b        EF        Close              Electrical failure    Degraded logic. 1  Periodic Test EFW Train A & B Train B Logic degraded from 2/3 FS2(Hi)                                                of 2 close signals              available      to 1/2 Contact 9-                                              permanently in 10                                                    place 141.3b        EF        Close              Electrical failure    Degrade logic. 1  Periodic Test EFW Train A & B Train B Logic degraded FS2(LO)                                                of 2 close signals              available Contact 2-3                                            permanently in after Hi flow 141.0c        EF        Open              Electrical failure    Degraded logic    Periodic Test EFW Train A & B Train B Logic degraded from 2/3 FS1(Hi)                                                Loss of                          available      to 2/2 Contact                                                3EF-62-FS1 9-10 141.1 c      EF        Open              Electrical failure    Degraded logic    Periodic Test EFW Train A & B Train B Logic degraded from 2/3 FS2(LO)                                                Loss of seal to                  available      to 2/2 Logic degrade from 2/3 to Contact                                                3EF-62-FS2                                      2/2 2-3 141.2c        EF        Open              Electrical failure    Degraded logic    Periodic Test EFW Train A & B Train B Logic degraded from 2/3 FS1(Hi)                                                Loss of                          available      to 2/2 Contact                                                3EF-62-FS 1 9-10 141.3c        EF        Close              Electrical failure    Degraded logic. 1  Periodic Test EFW Train A & B Train B Close Logic degraded FS2(LO)                                                of 2 close signals              available      from 2/3 to 1/2; No change to 2/2 Contact                                                in place w/250                                  Open Logic gpm flow 2-3 142.0a        EF        Open              Electrical failure    Degrade logic. Periodic Test EFW Train A & B Train B Logic degraded from 2/3 FS3(Hi)                                                Loss of                          available      to 2/2 Contact 9-10                                                    3EF-62-FS1 142.1 a      EF        Close              Electrical failure    Degraded logic. 1  Periodic Test EFW Train A & B Train B Logic degraded from 2/3 FS3(Hi)                                                of 2 close signals              available      to 1/2 Contact 9-                                              permanently in 10                                                    place (1)          "a" denotes flow through the cavitating venturi of >350 GPM "b" denotes flow through the cavitating venturi of >250 GPM <350 GPM increasing "c" denotes flow through the cavitating venturi of >250 GPM <350 GPM decreasing
 
U. S. Nuclear Regulatory Commission                                                                                                                                    Enclosure 4 3F0811-02                                                                                                                                                            Page 30 of 37 Z    Name          Failure Mode      Cause                Symptoms and        Method of          Inherent        Effect on ECCS                      Remarks and Other Cr            =!Local                                              Effects      Detection          Compensating                                        Effects
    "                                                          Including                              Provision
  -                                                            Dependent Failures 142.2a EF        Open              Electrical failure    Degraded logic      Periodic Test      EFW Train A & B Train B Logic degraded from 2/3 FS3(LO)                                                Loss of seal to                        available      to 2/2 Contact                                                3EF-62-FS3 2-3 142.3a EF        Close            Electrical failure    Degraded logic. 1  Periodic Test      EFW Train A & B Train B Close Logic degraded FS3(LO)                                                of 2 close signals                      available      from 2/3 to 1/2; No change to 2/2 Contact                                                in place w/250                                          Open Logic gpm flow 2-3 143.0  SS/EFV-        Open              Electrical Failure    Loss of Remote      Periodic Test      EFW Train A & B Train B No Manual Open              For all flows through 180-SV                                                Manual Open                            available      capability from Control Room        cavitating venturi Contact 3-4                                            capability 143.1  SS/EFV-        Close            Electrical Failure    Loss of Automatic  Periodic Test      EFW Train A    A single (1 of 2) train would no    For all flows through 180-SV                                                Close of EFV-1 80                      available      longer be able to perform its        cavitating venturi Contact 3-4                                                                                                    design functions. The affected 20XB energized                                          train s flow would be EFV-180 Opens                                          approximately 75% of design.
100% design flows are typically necessary only early in accidents.
The train with The failure will regain the ability to fully mitigate later in the accident scenario.
144.0  33o/EFV-      Open              Electrical Failure    Loss of Alarm for  Periodic Test      EFW Train A & B EFW Alarm Logic degraded            For all flows through 180 Contact                                            valve out of                            available                                            cavitating venturi c-d                                                    position.
144.1  33o/EFV-      Close            Electrical Failure    Nuisances Alarm    Annunciator Alarm  EFW Train A & B EFW Alarm Logic degraded            For all flows through 180 Contact                                                                                    available                                            cavitating venturi c-d                                                    2EFV-180 energized 144.2  33o/EFV-      Open              Electrical Failure    False indication    Periodic Test;      EFW Train A & B Degraded valve position              For all flows through 180 Contact                                            for valve position. Operator Validation available      Indication                          cavitating venturi a-b 144.3a 33o/EFV-      Close            Electrical Failure    False indication    Periodic Test;      EFW Train A & B Degraded valve position              For all flows through 180 Contact                                            for valve position. Operator Validation available      Indication                          cavitating venturi a-b 145.0  33c/EFV-      Open              Electrical Failure    Loss of Alarm for  Periodic Test      EFW Train A & B EFW Alarm Logic degraded            For all flows through 180 Contact                                            valve out of                            available                                            cavitating venturi a-b                                                    position.
(1)    "a" denotes flow through the cavitating venturi of >350 GPM "b" denotes flow through the cavitating venturi of >250 GPM <350 GPM increasing "c" denotes flow through the cavitating venturi of >250 GPM <350 GPM decreasing
 
U. S. Nuclear Regulatory Commission                                                                                                                                  Enclosure 4 3F0811-02                                                                                                                                                          Page 31 of 37 Z      Name          Failure Mode      Cause                Symptoms and        Method of          Inherent        Effect on ECCS                  Remarks and Other Local Effects      Detection          Compensating                                    Effects
(                                                            Including                              Provision
  -Dependent Failures 145.1    33c/EFV-      Close              Electrical Failure    False Alarm for    Periodic Test      EFW Train A & B EFW Alarm Logic degraded        For all flows through 180 Contact                                            valve out of                            available                                      cavitating venturi a-b                                                    position.
145.2    33c/EFV-      Open              Electrical Failure    False indication    Periodic Test;      EFW Train A & B Degraded valve position        For all flows through 180 Contact                                            for valve position. Operator Validation available      Indication                      cavitating venturi a-b 145.3    33c/EFV-      Close              Electrical Failure    False indication    Periodic Test;      EFW Train A & B Degraded valve position        For all flows through 180 Contact                                            for valve position. Operator Validation available      Indication                      cavitating venturi a-b 150.0    3EF-62-FS1    Fails to Energize  Electrical Failure    Degraded logic. Periodic Test      EFW Train A & B Train B Logic degraded from 2/3 For all flows through Loss of 1 close                        available      to 2/2                          cavitating venturi signal 150.1 a  3EF-62-FS1    Fails to          Electrical Failure    Degraded logic. 1  Periodic Test      EFW Train A & B Train B Logic degraded from 2/3 For all flows through Deenergize Close                        of 2 close signals                      available      to 1/2                          cavitating venturi permanently in place 150.2    3EF-62-FS1    Open              Electrical Failure    Degraded logic. Periodic Test      EFW Train A & B Train B Logic degraded          For all flows through Contact 1-2                                            Loss of Seal-in of                      available                                      cavitating venturi 3EF-62-FS1 150.3    3EF-62-FS1    Close              Electrical Failure    Degraded logic. 1  Periodic Test      EFW Train A & B Train B Logic degraded from 2/3 For all flows through Contact 1-2                                            of 2 close signals                      available      to 1/2                          cavitating venturi permanently in place 150.4    3EF-62-FS1    Open              Electrical Failure    Degraded logic. Periodic Test      EFW Train A & B Train B Logic degraded from 2/3 For all flows through Contact 7-8                                            Loss of 1 close                        available      to 2/2                          cavitating venturi signal 150.5    3EF-62-FS1    Close              Electrical Failure    Degraded logic. 1  Periodic Test      EFW Train A & B Train B Logic degraded from 2/3 For all flows through Contact 7-8                                            of 2 close signals                      available      to 1/2                          cavitating venturi permanently in place 150.6    3EF-62-FS1    Open              Electrical Failure    Degraded logic. Periodic Test      EFW Train A & B Train B Logic degraded from 2/3 For all flows through Contact 9-                                            Loss of 1 close                        available      to 2/2                          cavitating venturi 10                                                    signal (1)      "a" denotes flow through the cavitating venturi of >350 GPM "b" denotes flow through the cavitating venturi of >250 GPM <350 GPM increasing "c" denotes flow through the cavitating venturi of >250 GPM <350 GPM decreasing
 
U. S. Nuclear Regulatory Commission                                                                                                                            Enclosure 4 3F0811-02                                                                                                                                                    Page 32 of 37 Z      Name          Failure Mode      Cause                Symptoms and        Method of      Inherent        Effect on ECCS                  Remarks and Other Local Effects      Detection      Compensating                                    Effects
    "                                                          Including                          Provision
  -Dependent Failures 150.7    3EF-62-FS1    Close              Electrical Failure    Degraded logic. 1  Periodic Test  EFW Train A & B Train B Logic degraded from 2/3 For all flows through Contact 9-                                            of 2 close signals                available      to 1/2                          cavitating venturi 10                                                    permanently in place 150.8    3EF-62-FS1    Open              Electrical Failure    Degraded alarm      Periodic Test  EFW Train A & B EFW Alarm Logic degraded        For all flows through Contact 3-4                                            logic. Loss of 1                  available                                      cavitating venturi close signal 150.9    3EF-62-FS1    Close              Electrical Failure    Degraded alarm      Periodic Test  EFW Train A & B EFW Alarm Logic degraded        For all flows through Contact 3-4                                            logic. 1 of 2 close                available                                      cavitating venturi signals permanently in place 150.10  3EF-62-FS1    Open              Electrical Failure    Degraded alarm      Periodic Test  EFW Train A & B EFW Alarm Logic degraded        For all flows through Contact 5-6                                            logic. Loss of 1                  available                                      cavitating venturi close signal 150.11  3EF-62-FS1    Close              Electrical Failure    Degraded alarm      Periodic Test' EFW Train A & B EFW Alarm Logic degraded        For all flows through Contact 5-6                                            logic. 1 of 2 close                available                                      cavitating venturi signals permanently in place 151.0    3EF-62-FS2    Fails to Energize  Electrical Failure    Degraded logic. Periodic Test  EFW Train A & B Train B Logic degraded from 2/3 For all flows through Loss of 1 close                    available      to 2/2                          cavitating venturi signal 151.1    3EF-62-FS2    Fails to          Electrical Failure    Degraded logic. 1  Periodic Test  EFW Train A & B Train B Logic degraded from 2/3 For all flows through Deenergize                              of close signals                  available      to 1/2                          cavitating venturi permanently in place 151.2    3EF-62-FS2    Open              Electrical Failure    Degraded logic. Periodic Test  EFW Train A & B Train B Logic degraded          For all flows through Contact 1-2                                            Loss of Seal-in of                available                                      cavitating venturi 3EF-62-FS1 151.3    3EF-62-FS2    Close              Electrical Failure    Degraded logic. 1  Periodic Test  EFW Train A & B Train B Logic degraded from 2/3 For all flows through Contact 1-2                                            of 2close signals                  available      to 1/2                          cavitating venturi permanently in place 151.4    3EF-62-FS2    Open              Electrical Failure    Degraded logic. Periodic Test  EFW Train A & B Train B Logic degraded from 2/3 For all flows through Contact 7-8                                            Loss of 1 close                    available      to 2/2                          cavitating venturi signal (1)      "a" denotes flow through the cavitating venturi of >350 GPM "b" denotes flow through the cavitating venturi of >250 GPM <350 GPM increasing "c" denotes flow through the cavitating venturi of >250 GPM <350 GPM decreasing
 
U. S. Nuclear Regulatory Commission                                                                                                                          Enclosure 4 3F0811-02                                                                                                                                                  Page 33 of 37 Z    Name          Failure Mode      Cause                Symptoms and        Method of    Inherent        Effect on ECCS                  Remarks and Other r_
3                                                          Local Effects      Detection    Compensating                                    Effects CD                                                          Including                        Provision
  "                                                          Dependent Failures 151.5  3EF-62-FS2    Close              Electrical Failure    Degraded logic. 1  Periodic Test EFW Train A & B Train B Logic degraded from 2/3 For all flows through Contact 7-8                                            of 2 close signals                available      to 1/2                          cavitating venturi permanently in place 151.6  3EF-62-FS2    Open              Electrical Failure    Degraded logic. Periodic Test EFW Train A & B Train B Logic degraded from 2/3 For all flows through Contact 9-                                            Loss of 1 close                  available      to 2/2                          cavitating venturi 10                                                    signal 151.7  3EF-62-FS2    Close              Electrical Failure    Degraded logic. 1  Periodic Test EFW Train A & B Train B Logic degraded from 2/3 For all flows through Contact 9-                                            of 2 close signals                available      to 1/2                          cavitating venturi 10                                                    permanently in place 151.8  3EF-62-FS2    Open              Electrical Failure    Degraded alarm      Periodic Test EFW Train A & B EFW Alarm Logic degraded        For all flows through Contact 3-4                                            logic. Loss of 1                  available                                      cavitating venturi close signal 151.9  3EF-62-FS2    Close              Electrical Failure    Degraded alarm      Periodic Test EFW Train B & B EFW Alarm Logic degraded        For all flows through Contact 3-4                                            Iogic. 1 of 2 close              available                                      cavitating venturi signals permanently in place 151.10 3EF-62-FS2    Open              Electrical Failure    Degraded alarm      Periodic Test EFW Train A & B EFW Alarm Logic degraded        For all flows through Contact 5-6                                            logic. Loss of 1                  available                                      cavitating venturi close signal 151.11 3EF-62-FS2    Close              Electrical Failure    Degraded alarm      Periodic Test EFW Train A & B EFW Alarm Logic degraded        For all flows through Contact 5-6                                            logic. 1 of 2 close              available                                      cavitating venturi signals permanently in place 152.0  3EF-62-FS2    Fails to Energize  Electrical Failure    Degraded logic. Periodic Test EFW Train A & B Train B Logic degraded from 2/3 For all flows through Loss of 1 close                  available      to 2/2                          cavitating venturi signal 152.1  3EF-62-FS2    Fails to          Electrical Failure    Degraded logic. 1  Periodic Test EFW Train A & B Train B Logic degraded from 2/3 For all flows through Deenergize                              of 2 close signals                available      to 1/2                          cavitating venturi permanently in place 152.2  3EF-62-FS3    Open              Electrical Failure    Degraded logic. Periodic Test EFW Train A & B Train B Logic degraded          For all flows through Contact 1-2                                            Loss of Seal-in of                available                                      cavitating venturi 3EF-62-FS1 (1)    "a" denotes flow through the cavitating venturi of >350 GPM "b" denotes flow through the cavitating venturi of >250 GPM <350 GPM increasing "c" denotes flow through the cavitating venturi of >250 GPM <350 GPM decreasing
 
U. S. Nuclear Regulatory Commission                                                                                                                          Enclosure 4 3F0811-02                                                                                                                                                  Page 34 of 37 Z
C    Name          Failure Mode      Cause                Symptoms and        Method of    Inherent        Effect on ECCS                  Remarks and Other Local Effects      Detection    Compensating                                    Effects C-                                                          Including                        Provision
  -*                                                          Dependent Failures 152.3  3EF-62-FS3    Close              Electrical Failure    Degraded logic. 1  Periodic Test EFW Train A & B Train B Logic degraded from 2/3 For all flows through Contact 1-2                                            of 2 close signals                available      to 1/2                          cavitating venturi permanently in place 152.4  3EF-62-FS3    Open              Electrical Failure    Degraded logic. Periodic Test EFW Train A & B Train B Logic degraded from 2/3 For all flows through Contact 7-8                                            Loss of 1 close                  available      to 2/2                          cavitating venturi signal 152.5  3EF-62-FS3    Close              Electrical Failure    Degraded logic. 1  Periodic Test EFW Train A & B Train B Logic degraded from 2/3 For all flows through Contact 7-8                                            of 2 close signals                available      to 1/2                          cavitating venturi permanently in place 152.6  3EF-62-FS3    Open              Electrical Failure    Degraded logic. Periodic Test EFW Train A & B Train B Logic degraded from 2/3 For all flows through Contact 9-                                            Loss of 1 close                  available      to 2/2                          cavitating venturi 10                                                    signal 152.7  3EF-62-FS3    Close              Electrical Failure    Degraded logic. 1  Periodic Test EFW Train A & B Train B Logic degraded from 2/3 For all flows through Contact 9-                                            of 2 close signals                available      to 1/2                          cavitating venturi 10                                                    permanently in place 152.8  3EF-62-FS3    Open              Electrical Failure    Degraded alarm      Periodic Test EFW Train A & B EFW Alarm Logic degraded        For all flows through Contact 3-4                                            logic. Loss of 1                  available                                      cavitating venturi close signal 152.9  3EF-62-FS3    Close              Electrical Failure    Degraded alarm      Periodic Test EFW Train A & B EFW Alarm Logic degraded        For all flows through Contact 3-4                                            logic. 1 of 2 close              available                                      cavitating venturi signals permanently in place 152-10 3EF-62-FS3    Open              Electrical Failure    Degraded alarm      Periodic Test EFW Train A & B EFFW Alarm Logic degraded      For all flows through Contact 5-6                                            logic. Loss of 1                  available                                      cavitating venturi close signal 152-11 3EF-62-FS3    Close              Electrical Failure    Degraded alarm      Periodic Test EFW Train A & B EFW Alarm Logic degraded        For all flows through Contact 5-6                                            logic. 1 of 2 close              available                                      cavitating venturi signals permanently in place 153.0  20XB          Fails to Energize  Electrical Failure    Loss of Remote      Periodic Test EFW Train A & B Train B No Manual Open          For all flows through Manual Open                      available      capability from Control Room    cavitating venturi capability (1)    "a" denotes flow through the cavitating venturi of >350 GPM "b" denotes flow through the cavitating venturi of >250 GPM <350 GPM increasing "c" denotes flow through the cavitating venturi of >250 GPM <350 GPM decreasing
 
U. S. Nuclear Regulatory Commission                                                                                                                                    Enclosure 4 3F0811-02                                                                                                                                                            Page 35 of 37 Z
C      Name          Failure Mode      Cause                Symptoms and      Method of        Inherent        Effect on ECCS                      Remarks and Other Local Effects    Detection        Compensating                                        Effects (D                                                            Including                          Provision
  =Dependent Failures 153.1    20XB          Fails to          Electrical Failure    Loss of Automatic Periodic Test    EFW Train A    A single (1 of 2) train would no    For all flows through Deenergize                              Close of EFV-1 80                  available      longer be able to perform its        cavitating venturi 20XB energized                                      design  functions.
train s flow would The be affected EFV-180 Opens                                      approximately 75% of design.
100% design flows are typically necessary only early in accidents.
The train with the failure will regain the ability to fully mitigate later in the accident scenario.
153.2    20XB          Open              Electrical Failure    Loss of Automatic Periodic Test    EFW Train A    A single (1 of 2) train would no    For all flows through Contact 5-6                                            Close of EFV-1 80                  available      longer be able to perform its        cavitating venturi design functions. The affected EFV-1 80 Opens                                      train s flow would be approximately 75% of design.
100% design flows are typically necessary only early in accidents.
The train with The failure will regain the ability to fully mitigate later in the accident scenario.
153.4    20XB          Close              Electrical Failure    Loss of Remote    Periodic Test    EFW Train A & B Train B No Manual Open              For all flows through Contact 5-6                                            Manual Open                        available      capability from Control Room        cavitating venturi capability 153.5    20XB          Open              Electrical Failure    Loss of Alarm    Periodic Test    EFW Train A & B EFW Alarm Logic degraded            For all flows through Contact 1-2                                            Initiation signal                  available                                            cavitating venturi 153.6    20XB          Close              Electrical Failure    Nuisances Alarm  Annunciator Alarm EFW Train A & B EFW Alarm Logic degraded            For all flows through Contact 1-2                                            2EFV-180                            available                                            cavitating venturi energized 154.0    20XA          Fails to Energize  Electrical Failure    Loss of Alarm for Periodic Test    EFW Train A & B EFW Alarm Logic degraded            For all flows through valve out of                        available                                            cavitating venturi position.
154.1    20XA          Fails to          Electrical Failure    Nuisances Alarm  Annunciator Alarm EFW Train A & B EFW Alarm Logic degraded            For all flows through Deenergize                              when valve closes                  available                                            cavitating venturi 2EFV-180 energized 154.2    20XA          Open              Electrical Failure    Loss of Alarm for Periodic Test    EFW Train A & B EFW Alarm Logic degraded            For all flows through Contact 5-6                                            valve out of                        available                                            cavitating venturi position.
(1)      "a" denotes flow through the cavitating venturi of >350 GPM "b" denotes flow through the cavitating venturi of >250 GPM <350 GPM increasing "c" denotes flow through the cavitating venturi of >250 GPM <350 GPM decreasing
 
U. S. Nuclear Regulatory Commission                                                                                                                                  Enclosure 4 3F0811-02                                                                                                                                                          Page 36 of 37 Z
C Name          Failure Mode      Cause                Symptoms and      Method of        Inherent        Effect on ECCS                      Remarks and Other Local Effects    Detection        Compensating                                        Effects o                                                            Including                          Provision
  -Dependent Failures 154.3  20XA          Close              Electrical Failure    Nuisances Alarm  Annunciator Alarm EFW Train A & B EFW Alarm Logic degraded            For all flows through Contact 5-6                                            when valve closes                  available                                            cavitating venturi 2EFV-180 energized 154.4  20XA          Open              Electrical Failure    Loss of Alarm for Periodic Test    EFW Train A & B EFW Alarm Logic degraded            For all flows through Contact 9-                                            valve out of                        available                                            cavitating venturi 10                                                    position.
154.6  20XA          Close              Electrical Failure    Nuisances Alarm  Annunciator Alarm EFW Train A & B EFW Alarm Logic degraded            For all flows through Contact 9-                                                                                available                                            cavitating venturi 10                                                    2EFV-180 energized 155.0  2EFV-180      Fails to Energize  Electrical Failure    Loss of Alarm    Periodic Test    EFW Train A & B EFW Alarm Logic degraded            For all flows through available                                            cavitating venturi 155.1  2EFV-180      Fails to          Electrical Failure    Nuisances Alarm  Annunciator Alarm EFW Train A & B EFW Alarm Logic degraded            For all flows through Deenergize                              2EFV-180                            available                                            cavitating venturi energized 155.2  2EFV-180      Open              Electrical Failure    Loss of Alarm    Periodic Test    EFW Train A & B EFW Alarm Logic degraded            For all flows through Contact 1-5                                                                                available                                            cavitating venturi 155.3  2EFV-180      Close              Electrical Failure    Nuisances Alarm  Annunciator Alarm EFW Train A & B EFW Alarm Logic degraded            For all flows through Contact 1-5                                            2EFV-180                            available                                            cavitating venturi energized 156.0  EFV-180-SV    Fails to Energize  Electrical Failure    Valve remains in  Annunciator Alarm EFW Train A    A single (1 of 2) train would no    For all flows through Open position                      available      longer be able to perform its        cavitating venturi design functions. The affected train s flow would be approximately 75% of design.
100% design flows are typically necessary only early in accidents.
The train with the failure will regain the ability to fully mitigate later in the accident scenario.
(1)    "a" denotes flow through the cavitating venturi of >350 GPM "b" denotes flow through the cavitating venturi of >250 GPM <350 GPM increasing "c" denotes flow through the cavitating venturi of >250 GPM <350 GPM decreasing
 
U. S. Nuclear Regulatory Commission                                                                                                                                    Enclosure 4 3F0811-02                                                                                                                                                            Page 37 of 37 z          Name          Failure Mode      Cause                Symptoms and      Method of        Inherent    Effect on ECCS                      Remarks and Other Local Effects    Detection        Compensating                                      Effects CrIncluding                                                                                            Provision
  -Dependent Failures 156.1        EFV-180-SV    Fails to          Electrical Failure    Valve remains in  Annunciator Alarm EFW Train A  A single (1 of 2) train would no    For all flows through Deenergize                              Closed Position                    available    longer be able to perform its        cavitating venturi design functions. The affected train s flow would be a pproximately 75% of design.
100% design flows are typically necessary only early in accidents.
The train with the failure will regain the ability to fully mitigate later in the accident scenario.
157.0        DPDP-5B      Blown Fuse        Electrical Failure    Loss of Automatic Periodic Test    EFW Train A  A single (1 of 2) train would no    For all flows through Close of EFV-1 80                  available    longer be able to perform its        cavitating venturi design functions. The affected EFV-180 Opens                                    train s flow would be approximately 75% of design.
100% design flows are typically necessary only early in accidents.
The train with the failure will regain the ability to fully mitigate later in the accident scenario.
(1)          "a" denotes flow through the cavitating venturi of >350 GPM "b" denotes flow through the cavitating venturi of >250 GPM <350 GPM increasing "c" denotes flow through the cavitating venturi of >250 GPM <350 GPM decreasing}}

Latest revision as of 18:07, 10 March 2020

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