Text

Letter of Intent to Submit a Broad-Scope Risk-Informed Technical Specification Amendment Request
	ML031700451
Person / Time
Site:	South Texas
Issue date:	03/18/2003
From:	Head S; South Texas
To:	; Document Control Desk, Office of Nuclear Reactor Regulation
	Tjader T
References
	NOC-AE-03001458
	Download: ML031700451 (134)
	v • d • e

March 18, 2003 NOC-AE-03001458 STI: 31544055 10CFR50.36 U. S. Nuclear Regulatory Commission Attention: Document Control Desk One White Flint North 11555 Rockville Pike Rockville, MD 20852 South Texas Project Units 1 and 2 Docket Nos. STN 50-498, STN 50-499 Letter of Intent to Submit a Broad-Scope Risk-Informed Technical Specification Amendment Request

Reference:

Letter dated January 21, 2003 from Anthony R. Pietrangelo, NEI, to William D.

Beckner, NRC, "Forwarding of TSTFs" STP Nuclear Operating Company (STPNOC) proposes to submit a risk-informed set of Technical Specification changes. The proposed changes will be applied to a broad scope of Technical Specifications and will extensively employ a configuration risk management approach in lieu of the existing required completion times. The STPNOC submittal is provided as a pilot plant submittal for the industry.

This submittal is a "letter of intent" that includes all the elements and format typical of a license amendment. It is the initial submittal in the development of the STP full plant pilot as discussed in the referenced letter. Its purpose is to identify and resolve significant technical and policy issues prior to the formal submittal of a license amendment application. STPNOC and other industry representatives propose to meet with the NRC technical staff to discuss the proposed changes after the staff has had an opportunity to review the letter of intent. We believe the justifications and methodology for the final approved product will result in NRC guidance and criteria for the review of risk-informed applications that will be generically applicable to the industry. Following resolution of the significant technical and policy issues, STPNOC will formally submit a license amendment request.

STPNOC proposes this application as a pilot for DG 1122, "An Approach for Determining the Technical Adequacy of PRA Results for Risk-Informed Activities", and its associated Standard Review Plan Section 19.1. This risk-informed TS amendment request is a highly suitable and appropriate candidate for evaluating the process described in DG 1122 for determining application specific PRA quality. It is expected that this pilot effort will result in substantial benefit to both current and future nuclear power plants.

NOC-AE-03001458 Page 2 The NRC has indicated that review of pilot applications for DG 1122 are eligible for waiver of review fees and STPNOC requests that the subject review fees be waived for this application. This initial submittal does not include all the information required by DG 1122.

STPNOC will supplement this application during the review.

The attached draft Technical Specification amendment was developed so that it conforms to the five risk-informed principles established by the NRC:

It meets current regulations.

It maintains defense in depth.

It maintains sufficient safety margin.

Any increase in core damage frequency (CDF) is small.

The impact of the change can be monitored.

Details of how the proposed changes meet the five principles are provided in the attachments.

This set of proposed changes does not extend to surveillance testing requirements.

STPNOC believes there are substantial benefits to be gained from risk-informing surveillance requirements; however, STPNOC currently intends to follow the other industry initiatives in this area.

By using STPs Probabilistic Risk Assessment (PRA) to calculate the risk (i.e., CDF, LERF) from the actual plant configuration and comparing it to pre-determined risk thresholds, the configuration risk management program will be capable of providing both a technical basis and robust calculation of an acceptable configuration-specific allowed outage time. The Configuration Risk Management Program (CRMP) will be the same tool that is currently used to perform the assessment of plant risk required by 10CFR50.65(a)(4).

This proposed change is considered fitting and timely for the following reasons:

It is being submitted at the appropriate time in the overall industry plan for risk-informing the Technical Specifications. It is recognized by industry and NRC that this technological evolution of the Technical Specifications is needed for both current and future nuclear power plants and the state of-the-art in risk management technology makes it feasible now.

It is consistent with the current STP practices for risk-informed configuration management. STP has been applying risk-informed configuration management technology for the past five years to manage plant maintenance configurations and has the capability to quantify incremental changes in plant risk required for the implementation of the proposed changes.

It is consistent with the STP philosophy of optimizing safety by application of probabilistic risk technology.

It complements industry risk-informed Technical Specification initiatives and is a pilot application for a broad use of risk-informed configuration management for allowed outage time determination.

NOC-AE-03001458 Page 3

It effectively links the risk determination required by 10CFR50.65(a)(4) to a complementary Technical Specification allowed outage time.

STPNOC requests the review schedule include an objective of facilitating STPNOCs preparation and submittal of the formal license amendment request in the first quarter of 2004.

STPNOC recognizes that this proposed activity challenges the NRC, the industry and STPNOC itself, but passing this hurdle will be a significant milestone in risk-informed regulation. If you have any questions, please call Wayne Harrison at 361-972-7298 or me at 361-972-7136.

S. M. Head Manager, Licensing Attachments:

Table of Contents with Links

1. Description of Changes and Safety Evaluation

2. Technical Specification Mark-ups

3. Implementation

4. PRA Quality

NOC-AE-03001458 Page 4 cc:

(paper copy) (electronic copy)

Ellis W. Merschoff A. H. Gutterman, Esquire Regional Administrator, Region IV Morgan, Lewis & Bockius LLP U.S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 400 L. D. Blaylock/W. C. Gunst Arlington, Texas 76011-8064 City Public Service U. S. Nuclear Regulatory Commission Mohan C. Thadani Attention: Document Control Desk U. S. Nuclear Regulatory Commission One White Flint North 11555 Rockville Pike R. L. Balcom Rockville, MD 20852 Texas Genco, LP Richard A. Ratliff A. Ramirez Bureau of Radiation Control City of Austin Texas Department of Health 1100 West 49th Street C. A. Johnson Austin, TX 78756-3189 AEP Texas Central Company Cornelius F. OKeefe Jon C. Wood U. S. Nuclear Regulatory Commission Matthews & Branscomb P. O. Box 289, Mail Code: MN116 Wadsworth, TX 77483 C. M. Canady City of Austin Electric Utility Department 721 Barton Springs Road Austin, TX 78704

Contents NOC-AE-03001458 Table of Contents with Links This Table of Contents with hyperlinks is provided to facilitate navigating the electronic version of this submittal. : Description of Changes and Attachment 2: Technical Specification Safety Evaluation Markups Section 1: Description 3/4.3.1 REACTOR TRIP SYSTEM INSTRUMENTATION Section 2: Proposed Changes 3/4.3.2 ENGINEERED SAFETY Table 2: Detailed Description of FEATURES ACTUATION SYSTEM Changes INSTRUMENTATION Section 3: Background 3/4.3.3.5 REMOTE SHUTDOWN SYSTEM Section 4: Technical Analysis Compliance with Design and Licensing 3/4.3.3.6 ACCIDENT MONITORING Basis INSTRUMENTATION Defense in Depth 3/4.3.5 ATMOSPHERIC STEAM RELIEF VALVE INSTRUMENTATION Table 1: Three Train Design TS Requirements 3.4.2.2 PRESSURIZER CODE SAFETY VALVES Safety Margin 3/4.4.4 RELIEF VALVES Table 3: STP Systems with Reduced Design-basis Capability in Single 3/4.5.1 ACCUMULATORS Train Operation 3/4.5.2 ECCS SUBSYSTEMS - TAVG Section 5.1: No Significant Hazards GREATER THAN OR EQUAL TO 350°F Section 5.2 Applicable Regulatory Criteria 3/4.5.3 ECCS SUBSYSTEMS - Tavg LESS THAN 350oF Section 6: Environmental Assessment 3/4.5.5 REFUELING WATER STORAGE TANK 3/4.5.6 RESIDUAL HEAT REMOVAL (RHR) SYSTEM 3.6.1.7 CONTAINMENT PURGE SUPPLY AND EXHAUST

Contents NOC-AE-03001458 3/4.6.2 DEPRESSURIZATION AND Attachment 4: PRA Quality COOLING SYSTEMS - Containment Spray 3.6.2.3 REACTOR CONTAINMENT FAN COOLERS 3.7.1.2 AUXILIARY FEED WATER 3.7.1.3 AUXILIARY FEEDWATER STORAGE TANK 3.7.1.5 MAIN STEAM LINE ISOLATION VALVES 3.7.1.6 ATMOSPHERIC STEAM RELIEF VALVES 3.7.1.7 MAIN FEED WATER 3/4.7.3 COMPONENT COOLING WATER SYSTEM 3/4.7.4 ESSENTIAL COOLING WATER SYSTEM 3/4.7.7 CONTROL ROOM MAKEUP AND CLEANUP FILTRATION SYSTEM 3/4.7.8 FUEL HANDLING BUILDING (FHB) EXHAUST AIR SYSTEM 3/4.7.14 ESSENTIAL CHILLED WATER SYSTEM 3/4.8.1 A.C. SOURCES 3/4.8.2 D.C. SOURCES 3/4.8.3 ONSITE POWER DISTRIBUTION 3.13 ALLOWED OUTAGE TIME DETERMINATIONS Bases for Specification 3.13.1 : Implementation

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 1

1. Description of the changes being proposed and the reasons for seeking the changes.

(Back to Table of Contents)

STPNOC is proposing in this application to implement a risk-informed process for determining allowed outage times for STP Technical Specifications. The risk-informed process involves the application of the STP Configuration Risk Management Program (CRMP). The STP CRMP is a procedurally controlled program utilized by STPNOC for the implementation of 10CFR50.65(a)(4). The details of the proposed changes are described in Section 2 and in the mark-ups of the TS.

STPNOC is proposing this change as a pilot plant for the industry Risk-Informed Technical Specifications (RITS) and for evaluation of DG-1122, as described in the cover letter. The industry has been discussing the development of RITS with the NRC for about 3 years and has proposed eight initiatives. This particular initiative is commonly referred to as Initiative 4B, Risk-Informed Technical Specifications with a Backstop. Initiative 6 addresses the applicability of Technical Specification 3.0.3. Because of plant-specific 3-train design features, a portion of the STP application necessarily addresses conditions where TS 3.0.3 currently applies. The STP TS typically do not have an action for conditions where more than one of the three required trains of a function are inoperable and TS 3.0.3 must be applied to those configurations. Consequently, STPs application includes a risk-informed action for configurations with more than one inoperable train. STPs application also includes a provision to apply the risk-management process to situations where more than one channel of instrumentation actuation logic are inoperable, provided that at least one of the channels is still functional. Because TS 3.0.3 previously applied to this situation, this is also an extension of Initiative 4B into Initiative 6. This is discussed in more detail in Section 4.

The description of the changes will delineate to what extent the STPNOC application addresses TS 3.0.3/Initiative 6.

STPNOC believes it is appropriate for the CRMP to be able to determine the time that can be allowed in a configuration that previously required entry into TS 3.0.3. For many cases, the current TS would require application of TS 3.0.3 simply because the configuration is outside of that defined in the TS although the plant is unlikely to actually be in a seriously degraded condition. Even in unusual cases where all trains or channels of a system required by an LCO are inoperable, a risk assessment to determine the appropriate action time is preferable to application of TS 3.0.3. In such situations, there are often functionally redundant capabilities or the degree of degradation of the inoperable equipment would not prevent the plant level function from being achieved.

Industry Initiative 7 addresses conditions where a TS system might be declared inoperable for administrative reasons or for very low probability design-basis considerations but is otherwise able to perform its design-basis function. Application of the STPNOC configuration risk management program may consider the degree of functionality in the determination of the calculated allowed outage time (AOT). For instance, a component that is inoperable because it is disassembled (i.e., nonfunctional) may be calculated to have a shorter AOT than the same component that is inoperable solely because of a seismic design issue or an internal flooding issue. This is due to the fact that the components functionality

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 2 is only called into question for a specific initiating event (e.g., seismic event). When the likelihood of the seismic event is incorporated into the calculation, the result is a longer AOT, since for all other initiators the component remains capable of performing its intended function(s).

This change proposes the establishment of a new specification, Technical Specification (TS) 3.13, to determine risk-informed allowed outage times applicable to a number of identified LCOs. The proposed new TS 3.13 would be a separate specification in the STP Technical Specifications and would be referred to in the ACTION statement of the referencing specification as an option to the normal required action. Complementary changes would be made to specific TS to reference TS 3.13 to allow for application of the CRMP to determine the allowed outage time.

STPs use of TS 3.13 is somewhat different in format from the proposed Improved Technical Specifications (ITS) format, which incorporates the description of the alternative action directly into each LCO in the scope of the change. TS 3.13 accomplishes the same purpose with a shorthand approach to accommodate the format difference between the old NUREG-0452 STP Standard Technical Specifications and the ITS. However, the concept and implementation are the same.

The operator will have the option of using the existing TS allowed outage time for routine plant activities and emergent conditions that would not be expected to require an extension of the allowed outage time. This existing allowed outage time will be referred to in this application as the frontstop time. The frontstop time also provides the operator sufficient time to determine and apply an appropriate extended time from the application of the CRMP for those situations where it is determined that an extended allowed outage time is necessary.

Once the CRMP is applied and a component has exceeded its frontstop time, the CRMP must be applied to all subsequent inoperable TS components within the scope of the CRMP to determine the allowed outage time for the new configuration until no components are in ACTIONS beyond the frontstop time. Since the CRMP is the implementing process for 10CFR50.65(a)(4), this achieves consistency between the regulations and the Technical Specifications.

The CRMP establishes a Non-Risk Threshold of 1.0E-06 as the first level of threshold severity. At this threshold, the plant is required to initiate action to reduce or manage the risk associated with the configuration. The CRMP will establish a set of risk thresholds reflecting increasing risk significance with commensurate levels of severity and actions.

These actions would range from restoring equipment to service, installing temporary modifications, or rescheduling maintenance activities, up to and including transition to safer plant operating modes. A Potentially Risk-Significant Threshold core damage probability (CDP) of 1.0E-05 will be established to define the limit for the allowed outage time extension. The allowed outage time would be calculated as the time required for the cumulative risk associated with a plant configuration to cross the threshold. Should the Potentially Risk-Significant Threshold be exceeded, TS 3.13 would immediately impose the required action of the most restrictive TS where the action time had been extended beyond its frontstop.

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 3 To facilitate the implementation of the proposed risk-informed TS changes, a number of the required actions associated with the Instrumentation TS are proposed. STPNOC proposes to revise the Instrumentation TS to direct the operator to apply actions associated with the equipment actuated by the instrumentation. These proposed changes will also make the requirements of the TS consistent with respect to plant level safety functions. This proposed change is an STP-specific change that is not part of the industry initiative; however, STP believes it facilitates the Configuration Risk Management Program and this proposed TS amendment because it makes the required action requirements consistent across the plant safety functions and TS sections. In so doing, it reduces opportunity for confusion and misapplication of the TS. The specific changes are listed in Table 2 and discussed in more detail in Section 4.

Specification 3.13 introduces the concept of overall plant configuration risk management into the Technical Specifications. Allowable action times would be replaced for the affected specifications with an action requirement for the overall plant configuration based on the CRMP. A backstop AOT limit of 30 days is provided in the new specifications for those cases where the risk analysis by itself would allow excessively long allowable outage times for a loss of function of a TS component. The 30-day backstop would be applied individually to each LCO for which TS 3.13 has been invoked.

The proposed change may be applied to those structures, systems, and components (SSCs) that are supported by a plant-specific configuration risk management program. All of the components within the scope of the proposed change are modeled in the PRA such that the revised allowed outage time can be calculated. The LCOs and ACTIONs to which this proposed specification applies would each be modified to reference TS 3.13. This submittal only addresses specifications that are applicable in operating modes 1 through 4 because an approved PRA model is not yet available to cover shutdown configurations.

Approval of the changes proposed in this submittal will allow the plant to concentrate efforts in restoring and maintaining plant SSCs with the objective of maintaining a lower overall risk profile and reducing the likelihood of plant transients. In this way, the focus and attention to items most impacting nuclear safety is enhanced. Maintenance actions can then be prioritized based on how to most effectively limit or reduce risk due to the specific plant configuration at a specific time. This ability represents a significant and substantive technological improvement over current TS methodology. With multiple SSCs out of service the operator would be able to prioritize efforts to address equipment that would have the biggest effect in reducing the incremental risk. Application of the Technical Specifications with the proposed changes would require plant transitions to lower operating modes once the overall risk accumulation exceeds the 1.0E-05 CDP level (Potentially Risk Significant Threshold).

In general, the implementation of the STP Risk-Informed Technical Specifications would be consistent with the guidance in the NEI Risk-Informed Technical Specifications Risk Management Guide.

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 4 STPNOC takes exception to the risk management guide's proscription against permitting all trains of a function to be inoperable. As shown in Table 2, STPNOC believes there are circumstances where it is appropriate to apply the CRMP when all trains of a function are inoperable.

Implementation is addressed in more detail with specific examples in Attachment 3.

2. Detailed Description of Proposed Changes (Back to Table of Contents)

Table 2 describes the proposed changes to the Technical Specifications. It includes the deterministic basis and the risk basis for each proposed change. The table also indicates where the STP application is extended to Industry Initiative 6 (TS 3.0.3 initiative).

The risk basis column provides calculated AOT for the inoperable condition existing with no other SSC within the scope of the CRMP (i.e., PRA) being inoperable. To illustrate the risk margin a number of the functions depict the AOT without the application of the proposed 30-day backstop. The AOTs in this column represent "base case" and are calculated using the 1.0E-05, potentially risk significant thresholds. When "inoperable" is used in this column, it means that SSC is not capable of performing its intended function.

Application of the CRMP to those conditions where the function is degraded or where operator action can be procedurally credited to restore adequate capability could result in longer allowed outage time. Review of the information in this column provides a degree of insight on the available margin.

There are some configurations described in Table 2 for which the technical assessment or risk assessment has not been completed. STPNOC plans to complete those assessments prior to submittal of the formal license amendment request. Even though they are incomplete, they are still useful to demonstrate the full scope of the proposed risk-informed changes.

3. Background

(Back to Table of Contents)

STPNOC is proposing in this application to implement a risk-informed process for determining allowed outage times for STP Technical Specifications. The risk-informed process involves the application of the STP Configuration Risk Management Program (CRMP). The STP CRMP is also utilized by STPNOC for the implementation of 10CFR50.65(a)(4).

The current South Texas Project Technical Specifications are based on Westinghouse Standard Technical Specifications (Draft NUREG-0452 Rev. 5), which assume a two-train Engineered Safety Features design. However, the South Texas Project utilizes a three-train Engineered Safety Features design. Therefore, although the South Texas Project maintains an additional ESF train above the standard Westinghouse design, the South Texas TS Limiting Conditions for Operation and associated Action Statements have not effectively addressed the availability of the third ESF train. Furthermore, traditional Technical

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 5 Specifications are component and system specific in the sense that the designated allowed outage times do not take into consideration the cumulative risk of various other components being in their associated individual Action Statements concurrently, rather each Action Statement is independent of the other.

The Configuration Risk Management and Maintenance Rule Programs establish the means and methods to assess the risk due to out of service equipment associated with various plant configurations, including those in which multiple Technical Specification related systems are affected. Therefore, the intent of the changes to the Technical Specifications proposed in this submittal is to integrate the availability of the third ESF train along with the insights provided by the Configuration Risk Management Program to establish risk-informed allowed outage times for selected Specifications and which take into consideration the cumulative risk associated with each entry into an Action Statement.

This submittal is presented in a format that addresses the Principles of Risk-Informed Decision-making set forth in Regulatory Guides 1.174 and 1.177. Specifically, justification is provided which demonstrates that:

1. The proposed change meets the current regulations. No exemption or rule change is being requested.

The proposed changes provide a risk-informed methodology for determining the allowed outage times associated with selected Technical Specifications. The proposed changes are in compliance with current regulations. These evaluations provided in this application confirm that the proposed changes maintain adequate defense-in-depth, safety margin, and the capability to meet plant design-basis. Additionally, the risk-informed allowed outage times proposed are consistent with the Configuration Risk Management Program and the Maintenance Rule in ensuring adequate margin to core damage and/or radiation release. Therefore, the proposed changes to the Technical Specifications are in compliance with all current regulations while meeting all license conditions.

Refer to Section 5.2 of this submittal for a detailed justification.

2. The proposed change is consistent with the defense-in-depth philosophy. Traditional engineering considerations have been used to demonstrate this consistency.

The proposed Technical Specification changes preserve the existing balance between prevention of core damage, prevention of containment failure, and consequence mitigation by ensuring that allowed outage times are based upon the cumulative risk associated with the current plant configuration. The CRMP, in conjunction with the PRA, explicitly measures and accounts for the level of defense-in-depth from both an instantaneous and a cumulative basis. It considers plant design features, operating philosophy, and equipment capability. The ability of the CRMP to assess the level of defense-in-depth is a substantial technological improvement over current methods.

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 6 The risk assessment will adequately consider defense-in-depth, quantitatively in the PRA model and by a qualitative assessment of the specific configuration. For most plants, application of the risk assessment will allow sufficient extension of the frontstop time to meet station needs for maintenance and corrective action. Due to the availability of STPs third ESF train, in situations where TS 3.13 is applied, the CRMP will generally allow a significant extension of the frontstop completion time. However, for situations in which more than one Technical Specification SSC is inoperable, the allowed outage times will be similar in magnitude, and in some cases shorter, than existing allowed outage times.

Refer to Section 4 of this submittal for a detailed justification.

3. The proposed change maintains sufficient safety margin.

The allowed outage time changes proposed represent a risk-neutral to risk-beneficial change. Therefore, sufficient margins are maintained as a result of the proposed changes.

Since this is a risk-informed application, no change is proposed on design-basis features of the station. There are no changes to plant safety limits or setpoints.

Refer to Section 4 of this submittal for a detailed justification.

4. The proposed change does not measurably change overall average core damage frequency for STP. In fact, the proposed change implements a mechanism to ensure any change from any modeled core damage contributor is identified and monitored.

Therefore, it can be stated that the proposed change itself does not significantly impact core damage frequency and is consistent with the Commissions Safety Goal Policy Statement. In fact, the proposed changes will ensure that allowed outage times are based on and evaluated against established risk thresholds consistent with the Safety Goal Policy.

Refer to Section 4 of this submittal for a detailed justification.

5. The impact of the change should be monitored using performance measurement strategies.

Changes to core damage frequency and cumulative risk associated with Technical Specification related equipment being out of service will continue to be monitored in accordance with the Configuration Risk Management Program and Maintenance Rule Programs. Plant-specific performance indicators have already been identified and developed and have been in use for several years at STP.

Refer to Section 4 of this submittal for a detailed justification.

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 7

4. Technical Analysis (Back to Table of Contents)

STPNOC proposes to apply a risk-informed process to determine the allowed outage time for a number of Technical Specifications. The risk-informed process would apply the Configuration Risk Management Program (CRMP) to evaluate plant configurations and determine the time required for the risk to exceed the Potentially Risk Significant Threshold of 1.0E-05 and establish the allowed outage time for the configuration based on that time.

The CRMP would require the plant to initiate action to manage risk levels at the 1.0E-06 threshold. Because of the low risk significance of a number of components in the Technical Specifications, the process includes a backstop maximum allowed outage time of 30 days.

Compliance with Design and Licensing Basis STPNOC is proposing a risk-informed method for determining configuration based allowed outage times in lieu of Technical Specification LCOs.

The proposal does not include new plant design features, new operating parameters, new operating configurations, new design analyses, or new analytical assumptions. No new accidents are postulated and the mitigation for existing design-basis accidents is unchanged.

Table 2 describes the basic deterministic basis for each of the requested changes and depicts the calculated times required to accrue risk to a 1.0E-5 incremental core damage probability (ICDP) threshold for the affected systems assuming no additional modeled systems are concurrently unavailable. For single items, these times are longer than the allowed outage times in the existing Technical Specifications. The longer calculated times are a result of the robust design and redundancy typical of nuclear plants, coupled with the low likelihood of design-basis initiating events.

STPNOC will continue to manage its maintenance practices to maintain the good material condition of plant components. STPNOC will not unnecessarily extend out-of-service times such that equipment availability and reliability is adversely affected or in conflict with maintenance rule requirements. Since 1996, STPNOC has been able to routinely quantify risk from maintenance configurations. In that time, STPs maintenance history has consistently kept the configuration in a band with an ICDP < 1.0E-06, with only one configuration with an ICDP > 1.0E-06. There have been no configurations with an ICDP > 5.0E-06. STP equipment reliability and availability will still meet licensing and design-basis requirements established by regulations such as 10CFR50.63, Loss of all alternating current power and 10CFR50.65, Requirements for monitoring the effectiveness of maintenance at nuclear power plants.

The 30-day allowed outage time backstop limit established in Specification 3.13 provides further assurance that there is no significant challenge to the design and licensing basis from the longer allowed outage times.

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 8 Based on the assessment above, the extended allowed outage time will not affect design-basis assumptions for equipment availability and STPNOC concludes the proposed change does not change the design and licensing basis for STP.

Defense-in-Depth Following the guidance provided in Regulatory Guide (RG) 1.77, the impact of the proposed Technical Specification change on the defense-in-depth is addressed below. Based on the following discussion, STPNOC has concluded that the proposed change meets the defense in depth principle.

A reasonable balance among prevention of core damage, prevention of containment failure, and consequence mitigation is preserved, i.e., the proposed change in a TS has not significantly changed the balance among these principles of prevention and mitigation, to the extent that such balance is needed to meet the acceptance criteria of the specific design-basis accidents and transients, consistent with 10 CFR 50.36. TS change requests should consider whether the anticipated operational changes associated with a TS change could introduce new accidents or transients or could increase the likelihood of an accident or transient (as is required by 10 CFR 50.92).

The proposed change represents a more robust technical approach that preserves a reasonable balance among prevention of core damage, prevention of containment failure, and consequence mitigation. STPNOC is proposing no changes to the design of the plant or any operating parameter. No new operating configurations are being proposed. The design-basis is not changed by the proposed changes to the Technical Specifications.

The effect of the change when it is implemented will be that the CRMP will allow allowed outage times to vary based on the risk significance of the given plant configuration (i.e. the amount of equipment removed from service at any given time). In cases where there are multiple components inoperable in more than one train, the calculated risk-informed allowed outage time for the combination may be less than currently prescribed in the Technical Specifications. In many cases, the calculated allowed outage time for a single component will be greater than what the Technical Specifications currently allow.

As discussed above, STPNOCs configuration risk management program has shown that STPNOCs risk monitoring practices are effective. As another compensatory measure, proposed Specification 3.13 establishes a 30-day limit on the allowed outage times for those components whose calculated allowed outage times are particularly long (the "backstop").

Over-reliance on programmatic activities to compensate for weaknesses in plant design is avoided, e.g., use of high reliability estimates that are primarily based on optimistic program assumptions The proposed application of a plant-specific CRMP program to determine allowed outage times uses plant-specific operating experience for component reliability and availability

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 9 data. Thus, the allowances permitted by the CRMP are directly reflective of actual component performance in conjunction with component risk significance. In some cases the CRMP may use compensatory actions to reduce calculated risk in some configurations. These compensatory actions may be incorporated in procedures, work instructions, or other station media. The high degree of redundancy at STP reduces the reliance that might otherwise be placed on operator action or other programmatic activities.

STPs design includes three trains of Engineered Safety Feature (ESF) equipment, which is a robust design. Table 1 compares the defense-in-depth of STPs three-train design to the two-train design for a comparable Westinghouse PWR. Table 2, with the deterministic and risk bases, provides additional detail with respect to STPs accident mitigation capability with less than three trains available. The allowed outage times shown for STP with two of three trains out of service are roughly what would be expected to apply for a two-train plant with one of two trains out of service. The table clearly shows that significant margin is retained for either a three-train or a two-train design.

The Standard Technical Specifications for Westinghouse plants were written for standard plants with two trains of Engineered Safety Feature (ESF) equipment. For such standard plant designs, the safety functions are degraded (loss of single failure protection) when a single train of an ESF function is inoperable, and there is a loss of safety function when two trains of an ESF function are inoperable. At STP, however, when only one of the three ESF trains is inoperable, there is more margin than for a two-train plant during conditions where one of two ESF trains is inoperable. STP does not experience a complete loss of safety function when two of three trains of an ESF function are inoperable. Because of the third ESF train, it is reasonable for the probabilistic risk assessment calculations for STP to justify relatively long allowed outage times when one of three trains is inoperable, and a reasonable allowed outage time for conditions where two of three trains are inoperable.

STPNOC proposes to apply the CRMP to determine the appropriate allowed outage times based on quantifying the risk associated with the plant configuration. The advantage of the CRMP is that it quickly and accurately assesses the relative significance of a given configuration, including those that involve multiple components in a single train or more than one train of equipment. The use of the Configuration Risk Management Program proposed in this submittal is an effective method to determine the safety implications associated with multiple inoperable components. In addition, the combined CRMP enables the operator to identify the most effective actions (i.e., return to service priority) to take to restore the plant to a safer (i.e., less risk-significant) configuration and how prompt the corrective or compensatory action should be.

STP has structured its application for Risk-Informed Technical Specifications to incorporate the three train design concepts described above. The first entry in Table 2 below outlines a general philosophy of a typical two-train plant and a three-train plant with risk-informed Technical Specifications. The time allowed to be in a condition with

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 10 less than three trains operable is based on a reasonable time to restore operability and the capability of the remaining operable equipment. The STP Probabilistic Safety Assessment (PSA) shows that the risks incurred by the proposed allowed outage times are acceptable and consistent with guidance contained in the EPRI PSA Application Guide.

System redundancy, independence, and diversity are maintained commensurate with the expected frequency and consequences of challenges to the system, e.g., there are no risk outliers. The following items should be considered.

Whether there are appropriate restrictions in place to preclude simultaneous equipment outages that would erode the principles of redundancy and diversity, Application of the CRMP determines the risk significance of plant configurations. It also permits the operator to identify the equipment that has the greatest effect on the existing configuration risk. With this information, the operator can control the out-of-service duration and determine the consequences of removing additional equipment from service. The application of the CRMP approach places high value on key safety functions and works to ensure they remain a top priority over all plant conditions.

Whether compensatory actions to be taken when entering the modified AOT for pre-planned maintenance are identified, Application of the CRMP provides a structure to assist the operator in identifying effective compensatory actions for various plant maintenance configurations to maintain and manage acceptable risk levels.

Whether voluntary removal of equipment from service during plant operation should not be scheduled when adverse weather conditions are predicted or at times when the plant may be subjected to other abnormal conditions, and The CRMP is based on STPs Level 1 and 2 PRA, including external events; thus, the calculated values for configuration risk include the effect of adverse weather conditions on average. Consideration of existing weather effects on specific plant configurations is accounted for in the risk-informed programmatic application of the CRMP and in the stations Severe Weather procedure. STPNOC typically considers the potential effect of weather on planned maintenance of components that could potentially be challenged during severe weather, such as Standby Diesel Generators, Turbine Driven Auxiliary Feedwater, and Switchyard. Compensatory measures are also taken at STP for adverse weather conditions in accordance with plant procedures (e.g., freeze protection, storm warnings and watches).

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 11

Whether the impact of the TS change on the safety function should be taken into consideration. For example, what is the impact of a change in the AOT for the low-pressure safety injection system on the overall availability and reliability of the low-pressure injection function?

Application of the CRMP incorporates the impact of the extended allowed outage time on the availability and reliability of the affected plant-level safety functions and associated equipment. The effects will be quantified and traceable on the key figures-of-merit such as core damage frequency and large early release frequency. Managing to the actions required in proposed TS 3.13 and the risk-informed configuration management program will assure that the effects are known, small, and manageable.

Also, the balance of availability and reliability will also be monitored and corrected in accordance with the stations compliance with the Maintenance Rule.

As discussed in the description in Section 1, STPs application includes changes in the Actions associated with the actuation relays to require the operator to enter the specification associated with the actuated equipment. The specific changes are listed in Table 2. In each case, STP has included in the specification for the actuated equipment a reference to TS 3.13. The proposed change in the actuation relay action is consistent with the definition of OPERABILITY in the Technical Specifications since the instruments are considered support equipment for the actuated components and functions. Referring to the action for the actuated component will eliminate inconsistencies in the TS where the instrumentation has different required action time than the actuated component when the plant functions and associated consequences are the same. The proposed actions for the actuated systems address actions for one or more inoperable trains. Application of TS 3.13 will address the overall plant configuration.

In an extension of the CRMP beyond Initiative 4B, STP proposes to allow application of the CRMP to an emergent condition where more than one both channel of instrumentation actuation logic is inoperable, provided that at least one channel is functional. This would allow the CRMP to be applied in conditions that previously would have required entry into TS 3.0.3.

STP would not purposely remove both actuation channels from service simultaneously, and the CRMP would not permit continued operation in that configuration for an extended time.

When both channels are inoperable, STP proposes a condition that at least one channel still be functional. A channel would be considered to still be functional if it could reasonably be expected to perform its design function under the most likely accident-related service conditions. An example of a functional channel might be a channel found to have an unqualified seismic mounting but is otherwise operable.

Application of a risk-informed allowed outage time would be appropriate in this situation.

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 12 The proposed action is a logical application of a configuration risk management program. TS 3.0.3 was created to address conditions where the other TS had no prescribed action; i.e., where the plant was in an undefined operating configuration.

Application of the CRMP specifically addresses that situation by defining the risk associated with the configuration and facilitating the determination of the correct response. TS 3.0.3 prescribes only one action - shutdown. Shutdown might not be the most appropriate action and application of TS 3.13 and the CRMP provides the means for the operator to take a more effective and safer course of action.

Safety Margin In accordance with RG 1.177, with sufficient safety margins:

Codes and standards or their alternatives approved for use by the NRC are met.

Safety analysis acceptance criteria in the Licensing Basis (e.g., FSAR, supporting analyses) are met, or proposed revisions provide sufficient margin to account for analysis and data uncertainty.

Use of the CRMP to determine allowed outage time will not affect STPNOCs commitment to the codes and standards used in the design of STP. STPNOC is not proposing in this application to change any quality standard, material, or operating specification. Acceptance criteria for operability of equipment are not changed.

The design-basis analyses for STP remain applicable. Although STPNOC will be able to have design-basis equipment out of service longer than the current Technical Specifications allow, the actual expected increase in unavailability will be insignificant with respect to design-basis assumptions regarding accident mitigation. In addition, it would be expected that there would be some increase in reliability to offset any increase in unavailability.

In support of its application for the license amendment extending the allowed outage time for the Standby Diesel Generators (approved in Amendments 85 and 72), STP evaluated the capabilities of a single train of ESF equipment to mitigate design-basis accidents.

Because the governing event is a condition where only one train of ESF equipment is postulated to be available, the analyses and evaluations performed in support of Amendments 85 and 72 are relevant to the evaluations of the changes to the allowed outage times being proposed in the Risk-Informed Technical Specifications. The results of the deterministic evaluation done in support of those amendments show that with only one train of ESF equipment available, and allowing for some operator actions, STP can mitigate nearly all design-basis events. Those design-basis events that could not be mitigated are considered extremely rare (i.e., design-basis LOCA).

Table 3 depicts the capability described above for STP to mitigate design-basis accidents with only one of the three ESF trains available, such as might be postulated if a design-basis accident and worst single failure were to occur with one entire train unavailable.

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 13 This is a very conservative assumption because it imposes single failure while the plant is in an ACTION statement. Were the single failure not considered, there would be no reduction in mitigation capability. The table shows that there is a substantial margin of safety.

Proposed Specification 3.13 also helps protect the margin of safety by preventing operation for extended periods in a configuration where a single failure would cause the loss of function of a system required to mitigate a design-basis accident. Effective and timely maintenance practices will limit the time that any train of accident mitigation equipment is unavailable such that having even one train of ESF equipment out of service for 30 days (assuming a system or component where that duration is permitted by the CRMP) is expected to occur rarely, if ever. In addition, compliance with Maintenance Rule requirements and availability and reliability standards from the Revised Reactor Oversight Program will limit the time any required equipment is out of service.

5. Regulatory Safety Analysis 5.1. No Significant Hazards Determination (Back to Table of Contents)

The following changes to the Technical Specifications are included in the proposed license amendment:

Proposed new Specification 3.13 for allowed outage times to be determined by a risk-informed configuration risk management program and associated changes to the specific specifications that will apply TS 3.13

Proposed changes to certain ACTION statements in Instrumentation TS 3.3 to delete allowed outage times specific to the instrument and instead to apply the required ACTION for the actuated component or system

Proposed changes to certain ACTION statements in individual specifications to allow the application of the CRMP in accordance with the new Specification 3.13.

In accordance with the criteria set forth in 10CFR50.92, the South Texas Project has evaluated these proposed Technical Specification changes and determined they do not represent a significant hazards consideration. The following is provided in support of this conclusion.

1. Does the proposed change to the Technical Specifications involve a significant increase in the probability or consequences of an accident previously evaluated?

The proposed changes to the Technical Specifications to add new a TS 3.13 and to change specific TS to apply the new TS 3.13 do not involve a significant increase in the probability of an accident previously evaluated because the changes involve no change to the plant or its modes of operation. In addition, the risk-informed configuration management program will be applied to effectively manage the availability of required systems, structures, and components to assure there is no

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 14 significant increase in the probability of an accident. These proposed changes do not increase the consequences of an accident because the design-basis mitigation function of the affected systems is not changed and the risk-informed configuration management program will be applied to effectively manage the availability of systems, structures and components required to mitigate the consequences of an accident. The application of the risk-informed configuration management program is considered a substantial technological improvement over current methods.

The proposed changes to the Instrumentation TS 3.3 do not involve a significant increase in the probability or consequences of an accident previously evaluated because they only make the required action for instrumentation that supports other TS equipment consistent with the action required for the supported equipment. There are no changes in the design requirements or function.

Therefore, none of the proposed changes involve a significant increase in the probability or consequences of an accident previously evaluated.

2. Does the proposed change to the Technical Specifications create the possibility of a new or different kind of accident from any accident previously evaluated?

None of the proposed changes involve a new mode of operation or design configuration. There are no new or different systems, structures, or components proposed by these changes. Therefore, there is no possibility of a new or different kind of accident.

3. Does the proposed change to the Technical Specifications involve a significant reduction to a margin of safety?

Proposed new TS 3.13 and the associated changes to the specifications that apply the new TS 3.13 implement a risk-informed configuration management program to assure that adequate margins of safety are maintained. Application of these new specifications and the configuration management program considers cumulative effects of multiple systems or components being out of service and does so more effectively than the current Technical Specifications. Therefore, application of these new specifications will not involve a significant reduction in a margin of safety.

The proposed changes to TS 3.3 make the instrumentation required actions consistent with the supported equipment actions. This change maintains the current margin of safety for the functions supported by that equipment and instrumentation.

Based on the evaluation above, none of the proposed changes involve a significant reduction in a margin of safety.

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 15 5.2. Applicable Regulatory Criteria (Back to Table of Contents)

The proposed changes will revise the allowed outage times associated with selected specifications so that they will be managed in accordance with a risk-informed configuration risk management program (CRMP) instead of having a prescriptive time in the specification.

As discussed below, this change in format and allowed outage time management still incorporates the elements required by 10CFR50.36 for Technical Specifications.

10CFR50.36 requires that Technical Specifications contain limiting conditions for operation (LCOs). The changes proposed will retain the LCOs. The current LCOs associated with the specifications to be changed include ACTION statements that require shutdown if required conditions are not met in a specified time. 10CFR50.36 requires that: When a limiting condition for operation of a nuclear reactor is not met, the licensee shall shut down the reactor or follow any remedial action permitted by the technical specifications until the condition can be met. STPNOC is proposing to change the specifications to allow for a risk-informed process for determining required remedial action. The mechanism for STPNOCs change is a new Specification 3.13 that establishes a risk-informed configuration management program for determining required actions and allowed outage times, up to a 30-day limit. Individual LCOs will indicate if Specification 3.13 is applicable. Consequently, the provisions of 10CFR50.36 are met with the proposed TS 3.13.

STPNOC is not proposing changes that remove existing LCOs or which affect the 10CFR50.36 requirements for Safety Limits, Surveillance Requirements, Design Requirements, or Administrative Controls.

The proposed change complements recent changes to 10CFR50.65 requiring licensees to assess and manage risk associated with removing equipment from service for maintenance.

The risk-informed configuration management program used to determine the allowed outage time of the Technical Specifications also meets the requirement of 10CFR50.65(a)(4) for performing a risk assessment for equipment removed from service for maintenance.

As discussed in the section below, STPNOC is not proposing to change the design or licensing basis for STP. Compliance with other design-basis regulations (e.g., 10CFR50.49, 10CFR50.46) or the General Design Criteria is not changed.

Based on the discussion above, STPNOC concludes that the proposed changes to the LCOs to eliminate the specified required ACTION times and replace them with application of Specification 3.13 is in compliance with regulatory requirements.

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 16

6. Environmental Assessment (Back to Table of Contents)

This proposed Technical Specification Change has been evaluated against the criteria for and identification of licensing and regulatory actions requiring environmental assessment in accordance with 10CFR51.21. It has been determined that the proposed changes meet the criteria for categorical exclusion as provided for under 10CFR51.22 (c) (9). The following is a discussion of how the proposed Technical Specification Change meets the criteria for categorical exclusion.

10CFR51.22 (c) (9). Although the proposed change involves changes to requirements with respect to the use of a facility component, (i) the proposed change involves no Significant Hazards Consideration (refer to the No Significant Hazards Consideration section of this Technical Specification Change Request),

(ii) there is no significant change in the types or significant increase in the amounts of any effluents that may be released offsite since the proposed changes do not change the assumptions regarding generation of any radioactive effluents nor do they affect any of the permitted release paths, and (iii)there is no significant increase in individual or cumulative occupational radiation exposure.

Accordingly, the proposed change meets the eligibility criteria for categorical exclusion set forth in 10CFR51.22 (c)(9). Based on the aforementioned and pursuant to 10CFR51.22 (b),

no environmental assessment or environmental impact statement need be prepared in connection with issuance of an amendment to the Technical Specifications incorporating the proposed changes of this request.

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 17 Table 1 General Case: Three Train Design TS Requirements System/Condition Standard Two Current STP Proposed STP Risk- Safety Evaluation Comments Train Specification Specification Informed Specifications All Trains Operable Unlimited Unlimited Unlimited Two train and three train plants meet design-basis, including single failure criteria.

1 Train Inoperable 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months (typ.) 7 days (typ.) As determined by the 2-train plant: no loss of safety Application of the CRMP CRMP function, but does not meet single recognizes the defense-in-depth failure criteria. capabilities and limitations and provides reasonable time and STP (3 trains): no loss of safety technical basis to take corrective function; meets single failure actions. CRMP also takes into criteria in most cases. account integrated plant impacts including unavailability of multiple systems, thereby performing the function of a Safety Function Determination Program.

2 Trains Inoperable T.S 3.0.3 or T.S. 3.0.3 or As determined by the 2-train plant: loss of safety Application of the CRMP equivalent equivalent (typ.) CRMP function. Application of CRMP recognizes the capabilities and recognizes plant level functional limitations and provides reasonable redundancy in safety systems and time to take corrective actions.

the low probability of an initiating CRMP also takes into account event requiring two trains for unavailability of multiple systems, mitigation. Some time to restore thereby performing the function of the inoperable function is a Safety Function Determination appropriate based on the very low Program.

probability of an initiating event while in this configuration. Because STP typically has no action for 2 inoperable trains, TS STP (3 trains): loss of safety 3.0.3 applies and this extends function only for specific low Initiative 4B to cover Initiative 6 for probability events (see details these configurations.

below and Table 3). Retains safe shutdown capability for non-accident conditions. A risk-informed allowed outage time is appropriate.

3 Trains Inoperable NA T.S. 3.0.3 or As determined by the Loss of safety function Some time to restore the equivalent CRMP inoperable function is appropriate based on the very low probability of an initiating event while in this configuration. (RITS Initiative 6)

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 18 Table 2 Detailed Description of Changes and Basis Specification Old Action Requirement New Action Requirement Deterministic Basis Risk Basis RITS Number Calculated STP AOT Before Initiative Backstop (base case)1 3.3.1.1 Manual With the number of OPERABLE With one less than the Minimum Automatic reactor trip functions One channel: Backstop 4B, 6 Reactor Trip channels one less than the Channels OPERABLE, within 48 are still available. The reactor trip Minimum Channels OPERABLE hours restore the inoperable breakers motor control center Action 1 requirement, restore the channel or apply TS 3.13, OR be can be de-energized from the inoperable channel to in HOT STANDBY within the next control room to assure reactor OPERABLE status within 48 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months . trip.

hours or be in HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months . With the number of channels STP would not purposely enter a more than one less than the condition with both channels of Minimum Channels OPERABLE, manual reactor trip inoperable.

within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months restore at least one channel or apply TS 3.13, OR be in HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months With the number of OPERABLE With the number of OPERABLE The reactor trip breakers motor LATER 4B, 6 channels one less than the channels less than the Minimum control center can be de-3.3.1.20 Minimum Channels OPERABLE Channels OPERABLE energized from the control room RTBs requirement, be in at least HOT requirement and with at least one to assure reactor trip. The STANDBY within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months ; channel functional, within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months requirement that at least one Action 9 however, one channel may be be in at least HOT STANDBY or channel is functional provides bypassed for up to 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months for apply the requirements of assurance that the RTB will surveillance testing per specification 3.13; however, one perform as expected.

Specification 4.3.1.1, provided channel may be bypassed for up the other channel is OPERABLE. to 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months for surveillance testing STP would not purposely enter a per Specification 4.3.1.1, provided condition with both channels of the other channel is OPERABLE reactor trip breakers inoperable.

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 19 Table 2 Detailed Description of Changes and Basis Specification Old Action Requirement New Action Requirement Deterministic Basis Risk Basis RITS Number Calculated STP AOT Before Initiative Backstop (base case)1 With the number of OPERABLE With the number of OPERABLE There are two channels for these LATER 4B, 6 channels one less than the channels less than the Minimum functions. With only one channel 3.3.1.18 Minimum Channels OPERABLE Channels OPERABLE inoperable, the other channel will SI input from requirement, restore the requirement and with at least one be available to perform the ESFAS inoperable channel to channel functional, within 24 function. With both channels OPERABLE status within 24 hours restore the inoperable inoperable, at least one channel 3.3.1.21 hours, or be in at least HOT channel to OPERABLE status, or is required to be functional, Automatic Trip STANDBY within the next 6 apply the requirements of providing a high level of and Interlock hours; however, one channel Specification 3.13, OR be in at confidence that the design Logic may be bypassed for up to 4 least HOT STANDBY within the function will be accomplished.

hours for surveillance testing per next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months ; however, one Action 9A Specification 4.3.1.1, provided channel may be bypassed for up STP would not purposely enter a the other channel is OPERABLE. to 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months for surveillance testing condition with both channels of per Specification 4.3.1.1, provided reactor trip breakers inoperable.

the other channel is OPERABLE.

3.3.2.1.b With the number of OPERABLE With the number of OPERABLE There are two channels for these 1 channel: 30 days (backstop) 4B, 6 channels one less than the channels less than the Minimum functions. With only one channel SI Automatic Minimum Channels OPERABLE Channels OPERABLE inoperable, the other channel will Actuation Logic requirement, restore the requirement and with at least one be available to perform the 3.3.2.2.b inoperable channel to channel functional, within 24 function. With both channels OPERABLE status within 24 hours restore the inoperable inoperable, at least one channel CS Automatic hours, or be in at least HOT channel to OPERABLE status, or is required to be functional, Actuation Logic STANDBY within the next 6 apply the requirements of providing a high level of 3.3.2.3.a.2 hours and in COLD SHUTDOWN Specification 3.13, OR be in at confidence that the design within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months ; least HOT STANDBY within the function will be accomplished.

Containment however, one channel may be next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD Manual action is also available to Isolation bypassed for up to 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months for SHUTDOWN within the following perform the function. Manual Automatic surveillance testing per 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months ; however, one channel action is generally timely for most Actuation Logic Specification 4.3.2.1, provided may be bypassed for up to 4 accidents that would require the other channel is OPERABLE. hours for surveillance testing per actuation of these functions. In 3.3.2.3.c.1 Specification 4.3.2.1, provided the both cases, 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months is an Phase B other channel is OPERABLE. adequate frontstop to perform an Isolation assessment of the condition and Automatic determine the appropriate action Actuation Logic and AOT.

Action 14 .

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 20 Table 2 Detailed Description of Changes and Basis Specification Old Action Requirement New Action Requirement Deterministic Basis Risk Basis RITS Number Calculated STP AOT Before Initiative Backstop (base case)1 3.3.2.2.d Existing Action (to be Action a.): b. With the number of The current requirement would 1 channel: 30 days (backstop) 4B, 6 OPERABLE channels more be retained as Action a. and a CS on With the number of OPERABLE than one less than the Total new Action b. that applies TS Containment channels one less than the Total Number of channels, within 12 3.13 added for conditions where Pressure Hi-3 Number of Channels, place the hours apply the requirements more than one channels is inoperable channel in the of Specification 3.13 or be in at inoperable. The actuation logic 3.3.2.3.c.3 bypassed condition within 72 least HOT SHUTDOWN within for the subject functions is 2/4, Phase B on hours, or be in at least HOT the following 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months . which allows a relatively high Containment STANDBY within the next 6 degree or redundancy.

Pressure Hi-3 hours and in at least HOT Application of TS 3.13 would SHUTDOWN within the following permit the use of compensatory Action 17 b. 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months . One additional channel actions such as placing an (New Action) may be bypassed for up to 12 inoperable channel in trip. The hours for surveillance testing per 12 hour1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months frontstop time is Specification 4.3.2.1. commensurate with the safety significance of the functions.

3.3.2.1.a With the number of OPERABLE With the number of OPERABLE Automatic initiation of these 1 channel: 30 days (backstop) 4B, 6 channels one less than the channels less than the Minimum functions is the primary initiation SI Manual Minimum Channels OPERABLE Channels OPERABLE process. STP would not (A condition where neither Initiation requirement, restore the requirement, within 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months purposely enter a condition that channel is at least functional is inoperable channel to restore the inoperable channel to made both channels of a function expected to be rare.)

3.3.2.2.a OPERABLE status within 48 OPERABLE status or apply the inoperable. In addition, SI and CS CS Manual hours or be in at least HOT requirements of specification can be manually aligned and Initiation STANDBY within the next 6 3.13,OR be in at least HOT started from the control room.

3.3.2.3.a.1 hours and in COLD SHUTDOWN STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months The most critical systems for within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months . and in COLD SHUTDOWN within containment isolation are those Containment the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months that could be open to the Isolation atmosphere, which is generally Manual limited to the normally closed Initiation RCB purge For most design-basis events, manual alignment Action 19 is adequate for mitigation. A 48 hour5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months frontstop time is commensurate with the risk-significance of the condition.

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 21 Table 2 Detailed Description of Changes and Basis Specification Old Action Requirement New Action Requirement Deterministic Basis Risk Basis RITS Number Calculated STP AOT Before Initiative Backstop (base case)1 3.3.2.4.a.2 With the number of OPERABLE With the number of OPERABLE Steam line isolation is 1 channel: 30 days (backstop) 4B, 6 channels one less than the Total channels less than the Total accomplished primarily by Manual Steam Number of Channels, restore the Number of Channels and with at automatic initiation. The operator Line Isolation, inoperable channel to least one channel functional, can also manually isolate the System OPERABLE status within 48 within 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months restore the steam lines individually.

3.3.2.9.c hours or be in at least HOT inoperable channels to STANDBY within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in OPERABLE status or apply the For inoperable P-4: Immediate ESFAS at least HOT SHUTDOWN within requirements of Specification operator response to reactor trip Interlocks: the following 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months . 3.13,OR be in at least HOT is to confirm/trip the turbine.

Reactor Trip, STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months The requirement for at least one P-4 and in at least HOT SHUTDOWN channel to be functional provides Action 23 within the following 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months . additional assurance that the design function will be accomplished.

STP would not purposely enter a condition that made both channels of a function inoperable.

Automatic With the number of OPERABLE With less than the minimum In these conditions, the 1 channel: 30 days (backstop) NA Switchover to channels one less than the channels OPERABLE, declare inoperability of the instrument Containment Minimum Channels OPERABLE the associated makes the associated equipment Sump: requirement, restore the system/train/component inoperable and the appropriate inoperable channel to inoperable and apply the action is to enter the TS for that 3.3.2.7.a OPERABLE status within 48 requirements of the applicable equipment. This proposed Automatic hours or be in at least HOT Technical Specification Action. change makes the TS more Actuation Logic STANDBY within the next 6 consistent.

and Relays hours and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

3.3.2.7.b RWST low-low level Action 19 to new Action 26

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 22 Table 2 Detailed Description of Changes and Basis Specification Old Action Requirement New Action Requirement Deterministic Basis Risk Basis RITS Number Calculated STP AOT Before Initiative Backstop (base case)1 3.3.2.1.c With the number of OPERABLE With less than the minimum In these conditions, the 1 channel: 30 days (backstop) NA channels one less than the channels OPERABLE, declare inoperability of the instrument SI Actuation Minimum Channels OPERABLE the associated makes the associated equipment Relays requirement, be in at least HOT system/train/component inoperable and the appropriate 3.3.2.2.c STANDBY within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in inoperable and apply the action is to enter the TS for that COLD SHUTDOWN within the requirements of the applicable equipment. This proposed CS Actuation following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months ; however, one Technical Specification Action. change makes the TS more Relays channel may be bypassed for up consistent.

3.3.2.3.a.3 to 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months for surveillance testing per Specification 4.3.2.1, Containment provided the other channel is Isolation OPERABLE.

Actuation Relays 3.3.2.3.c.2 Phase B Isolation Actuation Relays Action 14 to new Action 26 3.3.2.6.c With the number of OPERABLE With less than the minimum In these conditions, the 1 channel: 30 days (backstop) NA channels one less than the channels OPERABLE, declare inoperability of the instrument Auxiliary Minimum Channels OPERABLE the associated makes the associated equipment Feedwater requirement be in at least HOT system/train/component inoperable and the appropriate Actuation STANDBY within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in inoperable and apply the action is to enter the TS for that Relays at least HOT SHUTDOWN within requirements of the applicable equipment. This proposed the following 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months ; however, Technical Specification Action. change makes the TS more Action 22 to one channel may be bypassed consistent.

New Action 26 for up to 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months for surveillance testing per Specification 4.3.2.1 provided the other channel is OPERABLE.

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 23 Table 2 Detailed Description of Changes and Basis Specification Old Action Requirement New Action Requirement Deterministic Basis Risk Basis RITS Number Calculated STP AOT Before Initiative Backstop (base case)1 3.3.2.6.a With the number of channels With less than the Minimum Administrative change to create a NA NA OPERABLE less than the Channels OPERABLE generally applicable ACTION.

Auxiliary Minimum Channels OPERABLE requirement, declare the Feedwater requirement, declare the affected associated Manual Auxiliary Feed Water Pump system/train/component Initiation inoperable and take ACTION inoperable and apply the Action 26 required by Specification 3.7.1.2. requirements of the applicable Technical Specification Action 3.3.2.10.a. For an inoperable channel, With less than the Minimum Administrative change to create a NA NA declare its associated ventilation Channels OPERABLE generally applicable ACTION.

Control train inoperable and apply the requirement, declare the Ventilation actions of Specification 3.7.7. associated Manual system/train/component Initiation inoperable and apply the 3.3.2.10.c. requirements of the applicable Technical Specification Action.

Control Room Ventilation (Old Action 27 - NOT USED)

Automatic Actuation Logic and Actuation Relays Old Action 27 to revised Action 26

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 24 Table 2 Detailed Description of Changes and Basis Specification Old Action Requirement New Action Requirement Deterministic Basis Risk Basis RITS Number Calculated STP AOT Before Initiative Backstop (base case)1 3.3.2.4.b With the number of OPERABLE With the number of OPERABLE There are two channels for these 1 channel: 30 days (backstop) 4B, 6 channels one less than the channels less than the Minimum functions. With only one channel Steam Line Minimum Channels OPERABLE Channels OPERABLE inoperable, the other channel will Isolation requirement, restore the requirement and with at least one be available to perform the Actuation Logic inoperable channel to channel functional, within 24 function. With both channels and Relays OPERABLE status within 24 hours restore the inoperable inoperable, at least one channel 3.3.2.6.b hours, or be in at least HOT channel to OPERABLE status or is required to be functional, STANDBY within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in apply the requirements of providing a high level of AFW Actuation at least HOT SHUTDOWN within specification 3.13, OR be in at confidence that the design Logic the following 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months ; however, least HOT STANDBY within 6 function will be accomplished.

Action 22 one channel may be bypassed hours and in at least HOT for up to 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months for surveillance SHUTDOWN within the following STP would not purposely enter a testing per Specification 4.3.2.1 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months ; however, one channel condition with both channels of provided the other channel is may be bypassed for up to 4 reactor trip breakers inoperable.

OPERABLE. hours for surveillance testing per Specification 4.3.2.1 provided the other channel is OPERABLE..

3.3.2.5.a With the number of OPERABLE With the number of OPERABLE There are two channels for these 1 channel: 30 days (backstop) 4B, 6 channels one less than the channels less than the Minimum functions. With only one channel Turbine Trip Minimum Channels OPERABLE Channels OPERABLE inoperable, the other channel will and FW requirement, restore the requirement and with at least one be available to perform the Isolation inoperable channel to channel functional, within 24 function. With both channels Actuation Logic OPERABLE status within 24 hours restore the inoperable inoperable, at least one channel and Relays hours or be in at least HOT channel to OPERABLE status or is required to be functional, Action 25 STANDBY within the next 6 apply the requirements of providing a high level of hours; however, one channel Specification 3.13, OR be in at confidence that the design may be bypassed for up to 4 least HOT STANDBY within the function will be accomplished.

hours for surveillance testing per next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months ; however, one Specification 4.3.2.1 provided the channel may be bypassed for up STP would not purposely enter a other channel is OPERABLE. to 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months for surveillance testing condition with both channels of per Specification 4.3.2.1 provided reactor trip breakers inoperable.

the other channel is OPERABLE.

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 25 Table 2 Detailed Description of Changes and Basis Specification Old Action Requirement New Action Requirement Deterministic Basis Risk Basis RITS Number Calculated STP AOT Before Initiative Backstop (base case)1 3.3.3.5 With the number of OPERABLE With the number of OPERABLE STP can achieve and maintain Not risk significant 4B remote shutdown monitoring remote shutdown monitoring safe shutdown using any one of Remote channels, transfer switches, channels, transfer switches, its three trains. The three trains Shutdown power or control circuits less power or control circuits less are well separated. Effective Action a. than the Minimum Channels than the Minimum Channels compensatory actions are OPERABLE as required by Table OPERABLE as required by generally available in the event 3.3-9, restore the inoperable Table 3.3-9, restore the this Action must be entered.

channel(s) to OPERABLE status inoperable channel(s) to Because of the very low risk within 7 days, or be in HOT OPERABLE status within 7 significance of these SHUTDOWN within the next 12 days. Otherwise, within the next components, requiring a plant hours. 30 days submit a Special shutdown is not warranted if they Report that defines the are inoperable.

corrective action to be taken.

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 26 Table 2 Detailed Description of Changes and Basis Specification Old Action Requirement New Action Requirement Deterministic Basis Risk Basis RITS Number Calculated STP AOT Before Initiative Backstop (base case)1 Accident As specified in Table 3.3-10 a. With the number of Accident monitoring Not risk significant NA Monitoring OPERABLE accident instrumentation has very low risk monitoring channels less significance and a high degree of 3.3.3.6 than the Minimum redundancy. Its risk-significance Channels OPERABLE as does not warrant having a required by Table 3.3-10, shutdown action. 7 days is restore the inoperable sufficient time to perform an channel(s) to OPERABLE assessment to determine the status within 7 days. required action and time Otherwise, within the next limitations.

30 days submit a Special Report that defines the corrective action to be taken.

b. With the number of OPERABLE accident monitoring channels less than the Total Number of Channels as required by Table 3.3-10, within 60 days restore the inoperable channel(s) to OPERABLE status or submit a Special Report that defines the corrective action to be taken.

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 27 Table 2 Detailed Description of Changes and Basis Specification Old Action Requirement New Action Requirement Deterministic Basis Risk Basis RITS Number Calculated STP AOT Before Initiative Backstop (base case)1 ACTION 1 - With the number of 3.3.5.1 OPERABLE channels less than With the number of OPERABLE In these conditions, the Approximately the same as AFW NA the required number of channels, channels less than the required inoperability of the instrument Atmospheric number of channels, declare the makes the associated equipment Steam Relief declare the affected valve(s) inoperable and apply Technical affected valve(s) inoperable and inoperable and the appropriate Valve apply Technical Specification action is to enter the TS for that Instrumentation Specification 3.7.1.6.

3.7.1.6. equipment. This proposed delete Action 2 change makes the TS more

- apply Action ACTION 2 - a. With one less consistent.

1 to all than the required number of OPERABLE channels, restore the inoperable channel to OPERABLE status within 7 days; or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months .

b. With two less than the required number of OPERABLE channels, restore at least three channels to OPERABLE status within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months ; or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months .

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 28 Table 2 Detailed Description of Changes and Basis Specification Old Action Requirement New Action Requirement Deterministic Basis Risk Basis RITS Number Calculated STP AOT Before Initiative Backstop (base case)1 3.4.2.2 With one pressurizer Code safety With one or more pressurizer Pressurizer power-operated relief LATER 4B, 6 valve inoperable, either restore Code safety valves inoperable, valves and pressurizer spray also Pressurizer the inoperable valve to within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months either restore the provide overpressure protection.

Code Safety OPERABLE status within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months inoperable valves to OPERABLE PORVs would normally provide Valves or be in at least HOT STANDBY status or apply the requirements relief such that Code safety within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in at least of Specification 3.13, OR be in at valves would not be expected to HOT SHUTDOWN within the least HOT STANDBY within 6 lift.

following 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months . hours and in at least HOT SHUTDOWN within the following 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months .

3.4.4 With one or both PORV(s) With one or both PORV(s) Current action prescribed by the 1 PORV: 372 days 4B inoperable, because of excessive inoperable, because of excessive TS would still be followed in most Pressurizer seat leakage, within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months either seat leakage, within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months either cases where this ACTION is 2 PORVs: 345 days PORVs and restore the PORV(s) to restore the PORV(s) to applied. Ability to apply TS 3.13 Block Valves OPERABLE status or close the OPERABLE status or close the gives the operator some associated block valve(s) with associated block valve(s)with additional leeway in the power maintained to the block power maintained to the block evaluation of current plant Action a valve(s); otherwise, be in at valve(s); otherwise apply the conditions with respect to the least HOT STANDBY within the requirements of specification 3.13 desirability of closing the PORV.

next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in HOT OR be in at least HOT STANDBY The additional time could allow SHUTDOWN within the following within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in for an evaluation of the degree of 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months . HOT SHUTDOWN within the seat leakage.

following 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months ..

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 29 Table 2 Detailed Description of Changes and Basis Specification Old Action Requirement New Action Requirement Deterministic Basis Risk Basis RITS Number Calculated STP AOT Before Initiative Backstop (base case)1 3.4.4 With one PORV inoperable due With one PORV inoperable due to Application of TS 3.13 will allow LATER 4B to causes other than excessive causes other than excessive seat an assessment of the Pressurizer seat leakage, within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months either leakage, within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months either functionality of the PORV and an PORVs and restore the PORV to OPERABLE restore the PORV to OPERABLE assignment of an AOT that Block Valves status or close the associated status or close the associated reflects the actual plant condition.

block valve and remove power block valve and remove power The redundant PORV is still from the block valve; restore the from the block valve; within the operable to perform the required Action b PORV to OPERABLE status following 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months restore the safety functions. The pressurizer within the following 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months or PORV to OPERABLE status or safety valves are still available for be in HOT STANDBY within the apply the requirements of design-basis overpressure relief.

next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in HOT Specification 3.13, OR be in HOT SHUTDOWN within the following STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months 6 hours. and in HOT SHUTDOWN within the following 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months .

3.4.4 With both PORVs inoperable due With both PORVs inoperable due Overpressure protection is still LATER 4B to causes other than excessive to causes other than excessive provided by the Code safety Pressurizer seat leakage, within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months either seat leakage, within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months either valves and pressurizer spray is PORVs and restore at least one of the restore at least one of the PORVs still available for response to Block Valves PORVs to OPERABLE status or to OPERABLE status or close normal pressure fluctuations.

close their associated block their associated block valves and valves and remove power from remove power from the block Action c the block valves and be in HOT valves and apply the STANDBY within the next 6 requirements of Specification hours and HOT SHUTDOWN 3.13, OR be in HOT STANDBY within the following 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months . within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and HOT SHUTDOWN within the following 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months .

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 30 Table 2 Detailed Description of Changes and Basis Specification Old Action Requirement New Action Requirement Deterministic Basis Risk Basis RITS Number Calculated STP AOT Before Initiative Backstop (base case)1 3.4.4 With one block valve inoperable, With one block valve inoperable, The existing required action LATER 4B within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months restore the block within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months restore the block makes no distinction regarding Pressurizer valve to OPERABLE status or valve to operable status or place the degree of functionality of the PORVs and place its associated PORV in its associated PORV in closed block valve. A degraded block Block Valves closed position; restore the block position; within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months restore valve may be able to perform its valve to operable status within 72 the block valve to operable status expected function.

hours; otherwise, be in at least or apply the requirements of Action d HOT STANDBY within the next 6 Specification 3.13; otherwise, be hours and in HOT SHUTDOWN in at least HOT STANDBY within within the following 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months . the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in HOT SHUTDOWN within the following 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months .

3.4.4 With both block valves With both block valves The existing requirement for LATER 4B inoperable, within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months restore inoperable, within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months restore restoration of operability within Pressurizer the block valves to operable the block valves to operable one hour is inadequate time to PORVs and status or place the associated status or place the associated take reasonable action.

Block Valves PORVs in the closed position; PORVs in the closed position; restore at least one block valve restore at least one block valve to to OPERABLE status within the OPERABLE status within the next Action e next hour; otherwise, be in at hour or apply the requirements of least HOT STANDBY within the Specification 3.13; otherwise, be next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in HOT in at least HOT STANDBY within SHUTDOWN within the following the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in HOT 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months . SHUTDOWN within the following 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months .

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 31 Table 2 Detailed Description of Changes and Basis Specification Old Action Requirement New Action Requirement Deterministic Basis Risk Basis RITS Number Calculated STP AOT Before Initiative Backstop (base case)1 3.5.1 With one accumulator With one or more accumulators The accumulators would only be LATER 4B, 6 inoperable, except as a result of inoperable, except as a result of expected to be used for the most Accumulators a closed isolation valve or the boron concentration outside the unlikely accidents and are not boron concentration outside the required limits, within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months credited in the PRA. Within 24 required limits, restore the restore the inoperable hours of determining one or more Action a inoperable accumulator to accumulator(s) to OPERABLE accumulators are inoperable, an OPERABLE status within 24 status or apply the requirements assessment can be performed to hours or be in at least HOT of Specification 3.13, OR be in at determine the significance of the STANDBY within the next 6 least HOT STANDBY within the condition and if compensatory hours and reduce pressurizer next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and reduce actions are necessary. This is a pressure to less than 1000 psig pressurizer pressure to less than conservative time considering the within the following 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months . 1000 psig within the following 6 low risk significance of these hours. components.

3.5.1 With the boron concentration of With the boron concentration of Accumulator boron concentration LATER 4B, 6 one accumulator outside the one or more accumulators outside deviations are not likely to be Accumulators required limit, restore the boron the required limit, within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months significantly outside required concentration to within the restore the boron concentration to limits. Conservatism in the required limits within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months or within the required limits or apply accident analysis provides Action b be in at least HOT STANDBY the requirements of Specification reasonable assurance that the within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and 3.13, OR be in at least HOT accumulators would still provide reduce pressurizer pressure to STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months their required function even with less than 1000 psig within the and reduce pressurizer pressure to concentration outside the limits.

following 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months . less than 1000 psig within the following 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months .

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 32 Table 2 Detailed Description of Changes and Basis Specification Old Action Requirement New Action Requirement Deterministic Basis Risk Basis RITS Number Calculated STP AOT Before Initiative Backstop (base case)1 3.5.2 With less than the above With less than the above With 1 inoperable train of SI, there 1 inoperable train: 4B subsystems OPERABLE, but subsystems OPERABLE, but with is no loss of safety function, and ECCS in

HHSI: 193 days with at least two High Head at least two High Head Safety STP meets single failure except MODES 1,2, &

LHSI: > plant life Safety Injection pumps in an Injection pumps in an OPERABLE for specific low probability events.

3 OPERABLE status, two Low status, two Low Head Safety Head Safety Injection pumps and Injection pumps and associated associated RHR heat RHR heat exchangers in an Action a exchangers in an OPERABLE OPERABLE status, and sufficient status, and sufficient flow paths flow paths to accommodate these to accommodate these OPERABLE Safety Injection OPERABLE Safety Injection pumps and RHR heat pumps and RHR heat exchangers,** within 7 days exchangers,** restore the restore the inoperable inoperable subsystem(s) to subsystem(s) to OPERABLE OPERABLE status within 7 days status or apply the requirements of or be in at least HOT STANDBY Specification 3.13, OR be in at within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in least HOT STANDBY within the HOT SHUTDOWN within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in HOT following 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months . SHUTDOWN within the following 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months .

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 33 Table 2 Detailed Description of Changes and Basis Specification Old Action Requirement New Action Requirement Deterministic Basis Risk Basis RITS Number Calculated STP AOT Before Initiative Backstop (base case)1 3.5.2 Existing ACTION b. moved to New ACTION b. With 2 inoperable trains of SI 2 inoperable trains: 4B, 6 ACTION c. there is generally not a loss of

HHSI: 38 days ECCS in With less than two of the required safety function, although STP

LHSI: 664 days MODES 1,2, & subsystems OPERABLE, within 6 cannot mitigate LBLOCA if the SI 3 hours restore at least one train is injecting into the broken 3 inoperable trains:

subsystem to OPERABLE status RCS loop. Mitigation of SBLOCA

HHSI: 9 hours1.041667e-4 days 0.0025 hours 1.488095e-5 weeks 3.4245e-6 months AND apply the requirements of with SI in the broken loop requires

LHSI: 9 days Action b Specification 3.13, OR be in at operator action. Steam line break least HOT STANDBY within the The functional redundancy of mitigation impaired, but DNB is RHR and LHSI to maintain long-next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in HOT not expected to occur.

SHUTDOWN within the following 6 term cooling makes the risk-hours. With no operable trains, STP significance of LHSI relatively loses the SI safety function; low.

however, a risk-informed AOT is With more than one inoperable appropriate to accommodate train, the application of TS 3.13 specific situations where the SI is proposed as a requirement trains are degraded but still rather than an option. This functional and to allow for timely accounts for the potential risk-actions commensurate with the significance of a configuration actual significance of the where the HHSI function could condition. be affected.

3.5.2 No ACTION c. Old ACTION b. Administrative change to NA Admin.

accommodate new ACTION b.

ECCS in In the event the ECCS is actuated No change to the TS requirement.

MODES 1,2, & and injects water into the Reactor 3 Coolant System, a Special Report shall be prepared and submitted to the Commission pursuant to Action c Specification 6.9.2 within 90 days describing the circumstances of the actuation and the total accumulated actuation cycles to date. The current value of the usage factor for each affected Safety Injection nozzle shall be provided in this Special Report whenever its value exceeds 0.70.

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 34 Table 2 Detailed Description of Changes and Basis Specification Old Action Requirement New Action Requirement Deterministic Basis Risk Basis RITS Number Calculated STP AOT Before Initiative Backstop (base case)1 3.5.3.1 With less than the above- With less than the above-required See the discussion above for LATER 4B required ECCS components ECCS components OPERABLE MODEs 1, 2, & 3. In addition, the ECCS OPERABLE because of the because of the inoperability of likelihood and potential MODE 4 inoperability of either the High either the High Head Safety consequences of a LOCA in Head Safety Injection pumps or Injection pumps or the flow paths MODE 4 are substantially the flow paths from the refueling from the refueling water storage reduced.

Action a water storage tank, restore at tank, within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months restore at least the required ECCS least the required ECCS components to OPERABLE components to OPERABLE status status within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months or be in or apply the requirements of COLD SHUTDOWN within the Specification 3.13, OR be in next 20 hours2.314815e-4 days 0.00556 hours 3.306878e-5 weeks 7.61e-6 months . COLD SHUTDOWN within the next 20 hours2.314815e-4 days 0.00556 hours 3.306878e-5 weeks 7.61e-6 months .

3.5.5 With the RWST inoperable, With the RWST inoperable, within The proposed action allows the 5 hours5.787037e-5 days 0.00139 hours 8.267196e-6 weeks 1.9025e-6 months (based on RWST not 4B restore the tank to OPERABLE 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months restore the tank to operator to make a determination being available) status within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months or be in at OPERABLE status or apply the based on the specific situation RWST least HOT STANDBY within 6 requirements of Specification and the degree of degradation of hours and in COLD SHUTDOWN 3.13, OR be in at least HOT the RWST. A number of MODE 1,2, 3, 4 within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months . STANDBY within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in situations may make the RWST COLD SHUTDOWN within the inoperable, but still functional following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months . (e.g., boron concentration slightly low or an ASME Code question).

3.5.6 With one RHR loop inoperable, With one RHR loop inoperable, The proposed action is justified 1 inoperable RHR train: 4B restore the required loop to within 7 days restore the required by the plant-specific function of RHR OPERABLE status within 7 days loop to OPERABLE status or RHR and the degree of

39 years MODE 1, 2, 3 or be in at least HOT STANDBY apply the requirements of redundancy at STP. STPs RHR within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in Specification 3.13, OR be in at does not perform a SI function. It Action a HOT SHUTDOWN within the least HOT STANDBY within the is required only for long-term following 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months . next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in HOT cooling after shutdown or post-SHUTDOWN within the following accident. In post-LOCA 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months . conditions, LHSI is functionally redundant.

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 35 Table 2 Detailed Description of Changes and Basis Specification Old Action Requirement New Action Requirement Deterministic Basis Risk Basis RITS Number Calculated STP AOT Before Initiative Backstop (base case)1 3.5.6 With two RHR loops inoperable, With two RHR loops inoperable, The proposed action is justified 2 inoperableRHR trains: 4B restore at least two RHR loops to within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months restore at least by the plant-specific function of RHR OPERABLE status within 24 two RHR loops to OPERABLE RHR and the degree of

504 days MODE 1, 2, 3 hours or be in at least HOT status or apply the requirements redundancy at STP. STPs RHR STANDBY within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in of Specification 3.13, OR be in at does not perform a SI function. It Action b HOT SHUTDOWN within the least HOT STANDBY within 6 is required only for long-term following 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months . hours and in HOT SHUTDOWN cooling after shutdown or post-within the following 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months accident. In post-LOCA conditions, LHSI is functionally redundant.

3.6.1.7 With a 48-inch containment With a 48-inch containment purge The proposed allowance for this No impact on CDF 4B purge supply and/or exhaust supply and/or exhaust isolation specification would seldom be Containment isolation valve open or not sealed valve open or not sealed closed, applied since these valves are Ventilation closed, close and/or seal close within 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months close and/or seal normally closed during operation that valve or isolate the close that valve or isolate the and there is no reason to open penetration(s) within 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months , penetration(s) or apply the them during power operation.

Action a otherwise be in at least HOT requirements of Specification Surveillance testing, will be STANDBY within the next 6 3.13, OR be in at least HOT performed during shutdown since hours and in COLD SHUTDOWN STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months the test interval has been within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months . and in COLD SHUTDOWN within extended to 18 months. The the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months . proposed change will provide a process to account for some degradation of the sealing capability.

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 36 Table 2 Detailed Description of Changes and Basis Specification Old Action Requirement New Action Requirement Deterministic Basis Risk Basis RITS Number Calculated STP AOT Before Initiative Backstop (base case)1 3.6.1.7 With the 18-inch supplementary With the 18-inch supplementary Pre-planned operator action can No impact on CDF 4B containment purge supply and/or containment purge supply and/or reasonably be credited to close Containment exhaust isolation valve(s) open exhaust isolation valve(s) open these valves for most accident Ventilation for reasons other than given in for reasons other than given in conditions.

Specification 3.6.1.7.b. above, Specification 3.6.1.7.b. above, close the open 18-inch valve(s) within 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months close the open 18-Action b or isolate the penetration(s) inch valve(s) or isolate the within 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months , otherwise be in at penetration(s), or apply the least HOT STANDBY within the requirements of Specification next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months , and in COLD 3.13, OR be in at least HOT SHUTDOWN within the following STANDBY within the next 6 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months . hours, and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

3.6.1.7 With a containment purge supply With a containment purge supply 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months provides adequate time No impact on CDF 4B and/or exhaust isolation valve(s) and/or exhaust isolation valve(s) to perform an assessment to Containment having a measured leakage rate having a measured leakage rate determine acceptable alternative Ventilation in excess of the limits of in excess of the limits of action and time needed to Specifications 4.6.1.7.2 and/or Specifications 4.6.1.7.2 and/or address an inoperable 4.61.7.3, restore the inoperable 4.61.7.3, within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months restore containment purge isolation Action c valve(s) to OPERABLE status or the inoperable valve(s) to valve.

isolate the penetrations so that OPERABLE status or isolate the the measured leakage rate does penetrations so that the not exceed the limits of measured leakage rate does not Specifications 4.6.1.7.2 and/or exceed the limits of Specifications 4.6.1.7.3 within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months , 4.6.1.7.2 and/or 4.6.1.7.3 or apply otherwise be in at least HOT the requirements of Specification STANDBY within the next 6 3.13; otherwise be in at least HOT hours, and in COLD STANDBY within the next 6 SHUTDOWN within the following hours, and in COLD SHUTDOWN 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months . within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 37 Table 2 Detailed Description of Changes and Basis Specification Old Action Requirement New Action Requirement Deterministic Basis Risk Basis RITS Number Calculated STP AOT Before Initiative Backstop (base case)1 3.6.2.1 With one Containment Spray With one Containment Spray The Containment Spray System 30-day backstop 4B System inoperable, restore the System inoperable, within 7 days is comprised of 3 trains. 2 Containment inoperable Spray System to restore the inoperable Spray operable trains meet the design- The Containment Spray System Spray OPERABLE status within 7 days System to OPERABLE status or basis and 1 train is adequate to is not risk-significant.

(Note 2) or be in at least HOT STANDBY apply the requirements of perform the system function at a within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months ; restore Specification 3.13, OR be in at degraded level. Reactor the inoperable Spray System to least HOT STANDBY within the Containment Fan Coolers provide OPERABLE status within the next 6 hour6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD functionally redundant next 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months or be in COLD SHUTDOWN within the following containment heat removal SHUTDOWN within the following 36 hours4.166667e-4 days 0.01 hours 5.952381e-5 weeks 1.3698e-5 months . capability. Compensatory actions 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months . can be taken to reduce Iodine contribution to operator dose.

3.6.2.1 The current TS have no action With more than one Containment Reactor Containment Fan 30-day backstop 4B, 6 for more than one train of CS Spray System inoperable, within Coolers provide functionally Containment inoperable and TS 3.0.3 would 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months restore the inoperable redundant containment heat The Containment Spray System Spray apply. Spray System to OPERABLE removal capability. Evaluations is not risk-significant New Action b. status or apply the requirements performed for STP TS of Specification 3.13, OR be in at Amendments 85/72 determined least HOT STANDBY within the that a single train of RCFCs and next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD Containment Spray is adequate SHUTDOWN within the following for containment heat removal and 36 hours4.166667e-4 days 0.01 hours 5.952381e-5 weeks 1.3698e-5 months . RCB pressure control in accident conditions. Compensatory actions can be taken to reduce Iodine contribution to operator dose.

3.6.2.3 With one group of the above With one group of the above Three trains of RCFCs provides a 30-day backstop 4B required Reactor Containment required Reactor Containment high degree of redundancy and Reactor Fan Coolers inoperable, restore Fan Coolers inoperable, within 7 Containment Spray is functionally The RCFCs are not risk-Containment the inoperable group of RCFC to days restore the inoperable group redundant for heat removal. significant at STP.

Fan Coolers OPERABLE status within 7 days of RCFC to OPERABLE status or (Note 2) or be in at least HOT STANDBY apply the requirements of within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in Specification 3.13, OR be in at COLD SHUTDOWN within the least HOT STANDBY within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months . next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 38 Table 2 Detailed Description of Changes and Basis Specification Old Action Requirement New Action Requirement Deterministic Basis Risk Basis RITS Number Calculated STP AOT Before Initiative Backstop (base case)1 3.6.2.3 The current TS have no action With more than one group of the Three trains of RCFCs provides a 30-day backstop 4B, 6 for more than one group of above required Reactor high degree of redundancy and Reactor RCFCs inoperable and TS 3.0.3 Containment Fan Coolers Containment Spray is functionally RCFCs are not risk-significant Containment would apply inoperable, within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months redundant for heat removal.

Fan Coolers restore at least two groups of RCFC to OPERABLE status or The 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months for a frontstop New Action b. time is appropriate considering apply the requirements of Specification 3.13, OR be in at the low risk-significance of the least HOT STANDBY within the system an degree of redundancy.

next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD Evaluations performed for STP SHUTDOWN within the following TS Amendments 85/72 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months . determined that a single train of RCFCs and Containment Spray is adequate for containment heat removal and RCB pressure control in accident conditions.

3.7.1.2 a. With one motor-driven a. With one motor-driven STPs design is highly redundant TDAFW: 275 days 4B auxiliary feedwater pump auxiliary feedwater pump with 3 motor-driven AFW pumps Auxiliary and 1 turbine-driven AFW pump. 2 MD AFW: 172 hours0.00199 days 0.0478 hours 2.843915e-4 weeks 6.5446e-5 months inoperable, restore the pump inoperable, restore the pump Feedwater to OPERABLE status within to OPERABLE status within Action a is simply extended to the 28 days. 30 days. backstop time and Action b.

Actions a & b permits the application of TS 3.13

b. With the turbine-driven b. With the turbine-driven auxiliary feedwater pump auxiliary feedwater pump inoperable, or with any two inoperable, or with any two auxiliary feedwater pumps auxiliary feedwater pumps inoperable, restore the inoperable, within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months affected auxiliary feedwater restore the affected auxiliary pump(s) to OPERABLE feedwater pump(s) to status within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months . The OPERABLE status or apply provisions of Specification the requirements of 3.0.4 are not applicable for Specification 3.13. The entry into Mode 3 for the provisions of Specification turbine-driven pump. 3.0.4 are not applicable for entry into Mode 3 for the turbine-driven pump.

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 39 Table 2 Detailed Description of Changes and Basis Specification Old Action Requirement New Action Requirement Deterministic Basis Risk Basis RITS Number Calculated STP AOT Before Initiative Backstop (base case)1 3.7.1.3 With the AFST inoperable, within With the AFST inoperable, within Application of TS 3.13 is 1 1/2 hours (assumes the AFST 4B 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months restore the AFST to 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months restore the AFST to appropriate. The cause for the is unavailable; however Auxiliary OPERABLE status or be in at OPERABLE status or apply the inoperability of the AFWST might shutdown is not appropriate nor Feedwater least HOT STANDBY within the requirements of Specification be such that it would be unsafe to required by the TS with no AFW Storage Tank next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in HOT 3.13, OR be in at least HOT shutdown to a condition where available to remove decay heat.

SHUTDOWN within the following STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months the tank was required. More (See TS 3.7.1.2.d) 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months . and in HOT SHUTDOWN within likely, the tank would be the following 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months . degraded but functional such that 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months for tank level an extended AOT would be justified.

3.7.1.5 With one MSIV inoperable but With one or more MSIV(s) 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months is an adequate time to Backstop - 30 days 4B, 6 open, POWER OPERATION inoperable but open, POWER determine the risk significance of Main Steam may continue provided the OPERATION may continue the condition. The assessment Isolation Valves inoperable valve is restored to provided the inoperable valve(s) may determine that although a OPERABLE status within 8 is restored to OPERABLE status MSIV is not operable under all hours; otherwise be in HOT or the requirements of aspects of the TS definition, it is Mode 1 STANDBY within the next 6 Specification 3.13 are applied still functional and additional time (Note 3) hours and in HOT SHUTDOWN within 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months ; otherwise be in can be taken to restore it to within the following 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months . HOT STANDBY within the next 6 operability.

hours and in HOT SHUTDOWN within the following 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months . *

Separate Limiting Condition for Operation entry is allowed for each MSIV

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 40 Table 2 Detailed Description of Changes and Basis Specification Old Action Requirement New Action Requirement Deterministic Basis Risk Basis RITS Number Calculated STP AOT Before Initiative Backstop (base case)1 3.7.1.6 With one less than the required With one less than the required 7 days is adequate time to LATER 4B atmospheric steam relief valves atmospheric steam relief valves determine alternative action and Atmospheric OPERABLE, restore the required OPERABLE, within 7 days restore allowed outage time. Additional Steam Relief atmospheric steam relief valves the required atmospheric steam allowed outage time will probably Valves to OPERABLE status within 7 relief valves to OPERABLE status be justifiable based on the days; or be in at least HOT or apply the requirements of expected availability of the STANDBY with the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months Specification 3.13 OR be in at condenser and associated steam Action a and in HOT SHUTDOWN within least HOT STANDBY with the dumps.

the following 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and place next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in HOT the required RCS/RHR loops in SHUTDOWN within the following operation for decay heat 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and place the required removal. RCS/RHR loops in operation for decay heat removal.

3.7.1.6 With two less than the required With two or more less than the 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months is adequate time to LATER 4B, 6 atmospheric relief valves required atmospheric relief valves determine alternative action and Atmospheric OPERABLE, restore at least OPERABLE, within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months allowed outage time. Additional Steam Relief three atmospheric relief valves to restore at least three atmospheric allowed outage time will probably Valves OPERABLE status within 72 relief valves to OPERABLE status be justifiable based on the hours or be in at least HOT or apply the requirements of expected availability of the STANDBY with the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months Specification 3.13 OR be in at condenser and associated steam Action b and in HOT SHUTDOWN within least HOT STANDBY with the dumps.

the following 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and place next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in HOT the required RCS/RHR loops in SHUTDOWN within the following operation for decay heat 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and place the required removal. RCS/RHR loops in operation for decay heat removal.

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 41 Table 2 Detailed Description of Changes and Basis Specification Old Action Requirement New Action Requirement Deterministic Basis Risk Basis RITS Number Calculated STP AOT Before Initiative Backstop (base case)1 3.7.1.7 With one or more MFIV(s) With one or more MFIV(s) MFRVs are available for isolation 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months 4B inoperable, close or isolate the inoperable, within 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months close function. Proposed revision to Main inoperable valve(s) within 4 or isolate the inoperable valve(s), the action provides operational Feedwater hours, or flexibility and potential Isolation Valves OR alternatives to closing or isolating (Note 3) verify within 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months that the the MFIV.

Main Feed Regulating Valve(s) verify within 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months that the Main (MFRV) in the same flow path(s) Feed Regulating Valve(s) (MFRV) Formatting changes for is/are available to perform in the same flow path(s) is/are readability and clarity.

feedwater isolation, and available to perform feedwater isolation close or isolate the MFIV(s) within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months and verify the AND valve(s) closed every 7 days.

within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months apply the Otherwise, be in MODE 3 within requirements of Specification the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and be in 3.13, OR close or isolate the MODE 4 within the following 6 MFIV(s) and verify the valve(s) hours.

closed every 7 days.

Otherwise, be in MODE 3 within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and be in MODE 4 within the following 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months .

3.7.3 With only two component cooling a. With only two component CCW has a high degree of 1 inoperable train of CCW: 4B water loops OPERABLE, restore cooling water loops redundancy. With one inoperable Component at least three loops to OPERABLE, within 7 days train, the system generally still

29 years Cooling Water OPERABLE status within 7 days restore at least three loops to meets the single failure criteria or be in at least HOT STANDBY OPERABLE status or apply with only modest degradation.

within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in the requirements of The 7 day frontstop time is not COLD SHUTDOWN within the Specification 3.13, OR be in at representative of the safety following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months . least HOT STANDBY within significance of one train of CCW the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD being inoperable.

SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months . Proposed as Action a. because of proposed new Action b. below.

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 42 Table 2 Detailed Description of Changes and Basis Specification Old Action Requirement New Action Requirement Deterministic Basis Risk Basis RITS Number Calculated STP AOT Before Initiative Backstop (base case)1 3.7.3 The current TS do not have an With two or more component Evaluations performed for STP 2 inoperable trains of CCW: 4B, 6 action for more than one cooling water loops inoperable, Amendments 85/72 showed that Component inoperable train of CCW. TS within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months restore at least a single train of CCW is adequate

248 days Cooling Water 3.0.3 would apply two loops to OPERABLE status or for safe shutdown and accident Proposed new apply the requirements of mitigation with only modest Action b. Specification 3.13, OR be in at degradation in capability. All 3 trains of CCW inoperable:

least HOT STANDBY within the

122 hours0.00141 days 0.0339 hours 2.017196e-4 weeks 4.6421e-5 months next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

3.7.4 With only two essential cooling a. With only two essential cooling With a single train of ECW 1 inoperable train of ECW 4B water loops OPERABLE, restore water loops OPERABLE, inoperable there is no loss of Essential at least three loops to within 7 days restore at least safety function, and the plant

78 - 93 days Cooling Water OPERABLE status within 7 days three loops to OPERABLE generally meets single failure for or be in at least HOT STANDBY status or apply the most probable design-basis within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in requirements of Specification events.

COLD SHUTDOWN within the 3.13, OR be in at least HOT following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months . STANDBY within the next 6 Proposed as Action a. because of hours and in COLD proposed new Action b. below.

SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months 3.7.4 The current TS do not have an With two or more essential With two inoperable ECW trains, 2 inoperable trains of ECW: 4B, 6 action for more than one cooling water loops inoperable, the plant retains its capability to Essential inoperable train of ECW. TS within12 hours restore at least mitigate a design-basis accident.

68 hours7.87037e-4 days 0.0189 hours 1.124339e-4 weeks 2.5874e-5 months Cooling Water 3.0.3 would apply two loops to OPERABLE status Proposed new or apply the requirements of Action b. Specification 3.13, OR be in at All 3 trains of ECW inoperable:

least HOT STANDBY within the

5 hours5.787037e-5 days 0.00139 hours 8.267196e-6 weeks 1.9025e-6 months next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 43 Table 2 Detailed Description of Changes and Basis Specification Old Action Requirement New Action Requirement Deterministic Basis Risk Basis RITS Number Calculated STP AOT Before Initiative Backstop (base case)1 3.7.7 With one Control Room Makeup With one Control Room Makeup The Control Room Makeup and 295 days (based on cooling 4B and Cleanup Filtration System and Cleanup Filtration System Cleanup Filtration System is supplied to protection Control Room inoperable, restore the inoperable, within 7 days restore comprised of three trains. With equipment)

Envelope inoperable system to the inoperable system to two operable trains, the system is HVAC OPERABLE status within 7 days OPERABLE status or apply the fully capable and will still be or be in at least HOT STANDBY requirements of Specification functional with a single failure.

within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in 3.13, OR be in at least HOT With only a single operable train, Mode 1,2,3 & 4 COLD SHUTDOWN within the STANDBY within the next 6 the system can still perform its Action a. following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months . hours and in COLD SHUTDOWN function, although it will be within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months . degraded.

3.7.7 With two Control Room Makeup With two Control Room Makeup The Control Room Makeup and [To be determined] (based on 4B and Cleanup Filtration Systems and Cleanup Filtration Systems Cleanup Filtration System is cooling supplied to protection Control Room inoperable, restore at least two inoperable, within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months comprised of three trains. With equipment Envelope systems to OPERABLE status restore at least two systems to two operable trains, the system is HVAC within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months or be in at least OPERABLE status or apply the fully capable and will still be HOT STANDBY requirements of Specification functional with a single failure.

within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in 3.13, OR be in at least HOT With only a single operable train, Mode 1,2,3 & 4 COLD SHUTDOWN within the STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months the system can still perform its Action b. following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months . and in COLD SHUTDOWN within function, although it will be the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months . degraded.

3.7.7 With three Control Room With three Control Room Makeup 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months is adequate time to [To be determined] (based on 4B Makeup and Cleanup Filtration and Cleanup Filtration Systems perform an assessment to cooling supplied to protection Control Room Systems inoperable, suspend all inoperable, suspend all determine if there are acceptable equipment)

Envelope operations involving movement operations involving movement of compensatory actions for HVAC of spent fuel, and crane spent fuel, and crane operation extending the allowed outage operation with loads over the with loads over the spent fuel time. A likely outcome is a spent fuel pool, and restore at pool, and within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months restore determination that the system is Mode 1,2,3 & 4 least one system to OPERABLE at least one system to degraded but still functional.

Action c. status within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months or be in at OPERABLE status or apply the least HOT STANDBY within the requirements of Specification next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD 3.13, OR be in at least HOT SHUTDOWN within the following STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months 30 hours. and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 44 Table 2 Detailed Description of Changes and Basis Specification Old Action Requirement New Action Requirement Deterministic Basis Risk Basis RITS Number Calculated STP AOT Before Initiative Backstop (base case)1 3.7.8 With one FHB exhaust air filter With one FHB exhaust air filter The second operable exhaust air 30-day backstop 4B train inoperable, restore the train inoperable, within 7 days filter train provides sufficient Fuel Handling inoperable filter train to restore the inoperable filter train redundancy to assure system Building HVAC OPERABLE status within 7 days to OPERABLE status or apply the function.

Action a. or be in at least HOT STANDBY requirements of Specification within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in 3.13, OR be in at least HOT COLD SHUTDOWN in the STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months . and in COLD SHUTDOWN in the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

3.7.8 With two FHB exhaust air With two FHB exhaust air filter 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months is adequate time to 30-day backstop 4B filter trains inoperable, trains inoperable, within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months perform an assessment to Fuel Handling restore at least one restore at least one inoperable determine if there are acceptable Building HVAC inoperable filter train to filter train to OPERABLE status or compensatory actions for Action b. OPERABLE status within 12 apply the requirements of extending the allowed outage hours or be in at least HOT Specification 3.13, OR be in at time. A likely outcome is a STANDBY within the next 6 least HOT STANDBY within the determination that the system is hours and in COLD next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD degraded but still functional.

SHUTDOWN in the following SHUTDOWN in the following 30 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months . hours.

3.7.8 With one FHB exhaust With one FHB exhaust ventilation 7days is adequate time to 30-day backstop 4B ventilation train inoperable, train inoperable, within 7 days perform an assessment to Fuel Handling restore the inoperable restore the inoperable exhaust determine if there are acceptable Building HVAC exhaust ventilation train to ventilation train to OPERABLE compensatory actions for Action c. OPERABLE status within 7 status or apply the requirements extending the allowed outage days or be in at least HOT of Specification 3.13, OR be in at time. A likely outcome is a STANDBY within the next 6 least HOT STANDBY within the determination that the system is hours and in COLD next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD degraded but still functional.

SHUTDOWN in the following SHUTDOWN in the following 30 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months . hours.

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 45 Table 2 Detailed Description of Changes and Basis Specification Old Action Requirement New Action Requirement Deterministic Basis Risk Basis RITS Number Calculated STP AOT Before Initiative Backstop (base case)1 3.7.8 With more than one FHB With more than one FHB exhaust 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months is adequate time to 30-day backstop 4B exhaust ventilation train ventilation train inoperable, within perform an assessment to Fuel Handling inoperable, restore at least two 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months restore at least two determine if there are acceptable Building HVAC exhaust ventilation trains to exhaust ventilation trains to compensatory actions for Action d. OPERABLE status within 12 OPERABLE status or apply the extending the allowed outage hours or be in at least HOT requirements of Specification time. A likely outcome is a STANDBY within the next 6 3.13, OR be in at least HOT determination that the system is hours and in COLD STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months degraded but still functional.

SHUTDOWN in the following 30 and in COLD SHUTDOWN in the hours following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

3.7.14 With only two Essential With only two Essential Chilled With a single train of EChW 1 inoperable train of EChW: 4B Chilled Water System loops Water System loops OPERABLE, inoperable there is no loss of Essential OPERABLE, restore three within 7 days restore at least safety function, and the plant

290 days Chilled Water loops to OPERABLE status three loops to OPERABLE status generally meets single failure for within 7 days or be in at or apply the requirements of most probable design-basis least HOT STANDBY within Specification 3.13, OR be in at events.

the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in least HOT STANDBY within the COLD SHUTDOWN within next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD Proposed as Action a. because of the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months . SHUTDOWN within the following proposed new Action b. below.

30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

3.7.14 The current TS do not have an With two or more Essential With two inoperable EChW trains, 2 inoperable trains of EChW: 4B, 6 action for more than one Chilled Water System loops the plant retains its capability to Essential inoperable train of EChW. TS inoperable, within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months mitigate a design-basis accident.

145 hours0.00168 days 0.0403 hours 2.397487e-4 weeks 5.51725e-5 months Chilled Water 3.0.3 would apply. restore at least two loops to New Action b. OPERABLE status or apply the requirements of Specification All three trains of EChW 3.13, OR be in at least HOT inoperable:

STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months

15 hours1.736111e-4 days 0.00417 hours 2.480159e-5 weeks 5.7075e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 46 Table 2 Detailed Description of Changes and Basis Specification Old Action Requirement New Action Requirement Deterministic Basis Risk Basis RITS Number Calculated STP AOT Before Initiative Backstop (base case)1 3.8.1.1 With one offsite circuit of the With one offsite circuit of the STP's switchyard is served by 8 584 days 4B above-required A.C. electrical above-required A.C. electrical incoming lines. There are 3 AC Sources power sources inoperable, power sources inoperable, transformers that are available to Operating demonstrate the OPERABILITY demonstrate the OPERABILITY each unit to power the 13.8 KV of the remaining A.C. sources by of the remaining A.C. sources by buses that supply the 4.16 KV performing Surveillance performing Surveillance emergency buses. There are 3 Action a Requirement 4.8.1.1.1.a within 1 Requirement 4.8.1.1.1.a within 1 trains of ESF power, only one of hour and at least once per 8 hour and at least once per 8 which is required to achieve and hours thereafter. Restore the hours thereafter. Within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months maintain safe shutdown. This is a offsite circuit to OPERABLE restore the offsite circuit to very reliable and redundant status within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months or be in at OPERABLE status or apply the power supply system. 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months is least HOT SHUTDOWN within requirements of Specification adequate to determine an the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and in COLD 3.13, OR be in at least HOT alternate action or justify addition SHUTDOWN within the following SHUTDOWN within the next 12 time to restore the condition.

24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months . hours and in COLD SHUTDOWN within the following 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 47 Table 2 Detailed Description of Changes and Basis Specification Old Action Requirement New Action Requirement Deterministic Basis Risk Basis RITS Number Calculated STP AOT Before Initiative Backstop (base case)1 3.8.1.1 With a standby diesel generator With a standby diesel generator With one inoperable SDG, STP 1 SDG inoperable: 4B inoperable, demonstrate the inoperable, demonstrate the has no loss of safety function and Action b OPERABILITY of the above- OPERABILITY of the above- generally meets the single failure

226 days required A.C. offsite sources by required A.C. offsite sources by criteria.

performing Surveillance performing Surveillance Requirement 4.8.1.1.1.a within 1 Requirement 4.8.1.1.1.a within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months and at least once per 8 hour and at least once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months thereafter. If the standby hours thereafter. If the standby diesel generator became diesel generator became inoperable due to any cause inoperable due to any cause other other than an inoperable support than an inoperable support system, an independently system, an independently testable testable component, or component, or preplanned preplanned preventive preventive maintenance or maintenance or testing, testing, demonstrate the demonstrate the OPERABILITY OPERABILITY of the remaining of the remaining OPERABLE OPERABLE standby diesel standby diesel generators by generators by performing performing Surveillance Surveillance Requirement Requirement 4.8.1.1.2.a.2) for 4.8.1.1.2.a.2) for each such each such standby diesel standby diesel generator generator separately within 8 separately within 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months , unless hours, unless it can be it can be demonstrated there is no demonstrated there is no common mode failure for the common mode failure for the remaining diesel generator(s).

remaining diesel generator(s). Within 14 days restore the Restore the inoperable standby inoperable standby diesel diesel generator to OPERABLE generator to OPERABLE status status within 14 days or be in at or apply the requirements of least HOT SHUTDOWN within Specification 3.13, OR be in at the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and in COLD least HOT SHUTDOWN within SHUTDOWN within the following the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and in COLD 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months . SHUTDOWN within the following 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 48 Table 2 Detailed Description of Changes and Basis Specification Old Action Requirement New Action Requirement Deterministic Basis Risk Basis RITS Number Calculated STP AOT Before Initiative Backstop (base case)1 3.8.1.1 With one offsite circuit of the With one offsite circuit of the Deletion of the requirement to LATER 4B above-required A.C. electrical above-required A.C. electrical restore at least two offsite circuits Action c power sources and one standby power sources and one standby to OPERABLE status within 72 diesel generator inoperable, diesel generator inoperable, hours and three standby diesel demonstrate the OPERABILITY demonstrate the OPERABILITY generators to OPERABLE status of the remaining A.C. sources by of the remaining A.C. sources by within 14 days from the time of performing Specification performing Specification initial loss is not a change 4.8.1.1.1a. within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months and at 4.8.1.1.1a. within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months and at because proper application of the least once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months thereafter; least once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months thereafter; TS would require this.

and if the standby diesel and if the standby diesel generator became inoperable generator became inoperable due due to any cause other than an to any cause other than an inoperable support system, an inoperable support system, an independently testable independently testable component, or preplanned component, or preplanned preventive maintenance or preventive maintenance or testing, demonstrate the testing, demonstrate the OPERABILITY of the remaining OPERABILITY of the remaining OPERABLE standby diesel OPERABLE standby diesel generator(s) by performing generator(s) by performing Surveillance Requirement Surveillance Requirement 4.8.1.1.2a.2) within 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months , 4.8.1.1.2a.2) within 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months , unless it can be demonstrated unless it can be demonstrated there is no common mode failure there is no common mode failure for the remaining diesel for the remaining diesel generators; restore at least one generators; within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months of the inoperable sources to restore at least one of the OPERABLE status within 12 inoperable sources to hours or be in at least HOT OPERABLE status or apply the STANDBY within the next 6 requirements of Specification hours and in COLD SHUTDOWN 3.13, OR be in at least HOT within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months . STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months Restore at least two offsite and in COLD SHUTDOWN within circuits to OPERABLE status the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months and three standby diesel generators to OPERABLE status within 14 days from the time of initial loss or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 49 Table 2 Detailed Description of Changes and Basis Specification Old Action Requirement New Action Requirement Deterministic Basis Risk Basis RITS Number Calculated STP AOT Before Initiative Backstop (base case)1 3.8.1.1 With one standby diesel With one standby diesel 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months is adequate time to LATER 4B generator inoperable in addition generator inoperable in addition determine the risk significance of Action d to ACTION b. or c. above, verify to ACTION b. or c. above, within the configuration. If there are that: 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months apply the requirements inoperable cross-train of Specification 3.13, OR be in at components, the allowed outage

1. All required systems, least HOT STANDBY within the time should depend on the risk subsystems, trains, next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD significance of the specific components, and devices SHUTDOWN within the following configuration. For instance, an that depend on the 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months . inoperable cross-train remaining OPERABLE accumulator or reactor diesel generator as a containment fan cooler would be source of emergency of low significance and additional power are also time can be justified if necessary.

OPERABLE, and

2. When in MODE 1, 2, or 3, the steam-driven auxiliary feedwater pump is OPERABLE.

If these conditions are not satisfied within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 50 Table 2 Detailed Description of Changes and Basis Specification Old Action Requirement New Action Requirement Deterministic Basis Risk Basis RITS Number Calculated STP AOT Before Initiative Backstop (base case)1 3.8.1.1 With two of the above required With two of the above required In this configuration, STP still has LATER 4B offsite A.C. circuits inoperable, offsite A.C. circuits inoperable, at least one ESF bus powered Action e restore at least one of the within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months restore at least from off-site power. 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months is inoperable offsite sources to one of the inoperable offsite adequate time to determine the OPERABLE status within 24 sources to OPERABLE status or appropriate action and allowable hours or be in at least HOT apply the requirements of time to restore the inoperable off-STANDBY within the next 6 Specification 3.13, OR be in at site power. This is not an hours. With only one offsite least HOT STANDBY within the expected configuration. Were it source restored, restore at least next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months . to occur, grid stability might be a two offsite circuits to OPERABLE factor and a plant shutdown could status within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months from time exacerbate the degraded of initial loss or be in at least condition. TS 3.13 provides an HOT STANDBY within the next 6 appropriate mechanism to hours and in COLD SHUTDOWN respond to the condition.

within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 51 Table 2 Detailed Description of Changes and Basis Specification Old Action Requirement New Action Requirement Deterministic Basis Risk Basis RITS Number Calculated STP AOT Before Initiative Backstop (base case)1 3.8.1.1 With two or three of the above With two or three of the above With 2 inoperable SDGs, STP 2 SDGs inoperable: 4B required standby diesel required standby diesel does not lose the safety function Action f generators inoperable, generators inoperable, and can meet almost all its

238 hours0.00275 days 0.0661 hours 3.935185e-4 weeks 9.0559e-5 months demonstrate the OPERABILITY demonstrate the OPERABILITY design bases.

of two offsite A.C. circuits by of two offsite A.C. circuits by performing the requirements of performing the requirements of Deleting the requirement to All three SDGs inoperable:

Specification 4.8.1.1.1a. within 1 Specification 4.8.1.1.1a. within 1 restore at least three standby diesel generators to OPERABLE

40 hours4.62963e-4 days 0.0111 hours 6.613757e-5 weeks 1.522e-5 months hour and at least once per 8 hour and at least once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months thereafter; restore at least hours thereafter; within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months status within 14 days from time of one standby diesel generator to restore at least one standby initial loss is not a change since OPERABLE status within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months diesel generator to OPERABLE proper application of the TS and at least two standby diesel status AND apply the requires this interpretation generators to OPERABLE status requirements of Specification without it being stated.

within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months or be in at least 3.13, OR be in at least HOT HOT STANDBY within the next 6 STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months hours and in COLD SHUTDOWN and in COLD SHUTDOWN within within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months . the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

Restore at least three standby diesel generators to OPERABLE status within 14 days from time of initial loss or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

3.8.1.1 With one required load With one required load sequencer 3.8.1.1.d will require an 272 days 4B sequencer inoperable, restore inoperable, within 7 days restore assessment of the condition Action g. the inoperable load sequencer to the inoperable load sequencer to within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months to determine if (Note 3) operable status within 7 days or operable status or apply the required cross-train components be in HOT SHUTDOWN within requirements of Specification are inoperable. 7 days is the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and in COLD 3.13, OR be in HOT SHUTDOWN sufficient time to assess less SHUTDOWN within the following within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and in restrictive conditions. There may 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months . COLD SHUTDOWN within the be justification for additional time following 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months . based on configurations with no additional inoperable components or inoperable components with low risk-significance.

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 52 Table 2 Detailed Description of Changes and Basis Specification Old Action Requirement New Action Requirement Deterministic Basis Risk Basis RITS Number Calculated STP AOT Before Initiative Backstop (base case)1 3.8.1.1 With one required load With one required load sequencer This is bounded by the case for 514 hours0.00595 days 0.143 hours 8.498677e-4 weeks 1.95577e-4 months 4B, 6 sequencer inoperable and one inoperable and one required proposed TS 3.8.1.1.f. For this Action h. required standby diesel generator standby diesel generator not case (TS 3.8.1.1.h), the SDG (Note 3) not associated with the associated with the inoperable associated with the inoperable inoperable sequencer also sequencer also inoperable or with sequencer can still be manually inoperable restore the inoperable more than one required load started and loaded.

load sequencer and/or the sequencer inoperable, within 24 inoperable standby diesel hours restore the inoperable load In addition, the third sequencer-generator not associated with the sequencer(s) and/or the SDG train is still available and is inoperable load sequencer to inoperable standby diesel adequate to achieve and OPERABLE status within 24 generator not associated with the maintain safe shutdown and is hours or be in at least HOT inoperable load sequencer to able to mitigate nearly all design-STANDBY within the next 6 OPERABLE status or apply the basis events.

hours and in COLD SHUTDOWN requirements of Specification within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months . 3.13, OR be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

3.8.2.1 a. With one of the required With less than the required STP has 4 battery banks, each 196 days 4B, 6 battery banks inoperable, battery banks or battery chargers with two full capacity chargers.

D.C. Sources restore the inoperable OPERABLE, within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months The chargers are even less risk-battery bank to OPERABLE restore the inoperable battery significant due to their status within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months or be in bank or battery charger or apply redundancy.

at least HOT STANDBY the requirements of Specification within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and 3.13, OR be in at least HOT in COLD SHUTDOWN within STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months . and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

b. With no battery chargers for a channel OPERABLE, restore at least one battery charger to OPERABLE status within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 53 Table 2 Detailed Description of Changes and Basis Specification Old Action Requirement New Action Requirement Deterministic Basis Risk Basis RITS Number Calculated STP AOT Before Initiative Backstop (base case)1 3.8.3.1 With one of the required trains of With the required trains of A.C. 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months is sufficient time to 253 days 4B, 6 A.C. ESF busses not fully ESF busses not fully energized, assess the configuration and Onsite Power energized, reenergize the train within 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months reenergize the train determine the appropriate action Distribution within 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months or be in at least or apply the requirements of and allowed outage time.

Operating HOT STANDBY within the next 6 Specification 3.13, OR be in at Extending the time beyond 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months and in COLD SHUTDOWN least HOT STANDBY within the hours can be justified due to the within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months . next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD redundancy of the ESF power.

Action a SHUTDOWN within the following STP does not lose the safety 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months . function unless all three trains of ESF power are lost.

3.8.3.1 With one A.C. vital distribution With one or more A.C. vital 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months provides time for an 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months 4B, 6 panel either not energized from distribution panel(s) either not assessment to determine an Action b. its associated inverter, or with energized from its associated appropriate allowed outage time the inverter not connected to its inverter, or with the inverter not for the configuration. The associated D.C. bus: (1) connected to its associated D.C. redundancy of the STP electrical reenergize the A.C. distribution bus: (1) within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months reenergize power systems will provide panel within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months or be in at the A.C. distribution panel(s) or adequate justification for least HOT STANDBY within the apply the requirements of extending the time beyond 2 next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD Specification 3.13 , OR be in at hours. Additional assessments SHUTDOWN within the following least HOT STANDBY within the may be performed to determine 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months ; and (2) reenergize the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD the time needed to re-energize A.C. vital distribution panel from SHUTDOWN within the following the panel(s) from the associated its associated inverter connected 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months ; AND (2) within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months inverter. The panels can also be to its associated D.C. bus within reenergize the A.C. vital powered from an alternate 1E 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months or be in at least HOT distribution panel(s) from its diesel backed bus.

STANDBY within the next 6 associated inverter connected to hours and in COLD SHUTDOWN its associated D.C. bus or apply within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months . the requirements of Specification 3.13, OR be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 54 Table 2 Detailed Description of Changes and Basis Specification Old Action Requirement New Action Requirement Deterministic Basis Risk Basis RITS Number Calculated STP AOT Before Initiative Backstop (base case)1 3.8.3.1 With one D.C. bus not energized With one or more D.C. bus(es) STP has 4 battery banks, each LATER 4B from its associated battery bank, not energized from its associated with two full capacity chargers.

Action c. reenergize the D.C. bus from its battery bank, within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months STP can lose up to two battery associated battery bank within 2 reenergize the D.C. bus(es) from banks without jeopardizing a hours or be in at least HOT its associated battery bank or safety function.

STANDBY within the next 6 apply the requirements of hours and in COLD SHUTDOWN Specification 3.13, OR be in at within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months . least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

3.13 Did not exist Defines the actions to take at As described for the individual As described for the individual 4B changing risk levels of the plant applications applications configuration BASES Section added to explain these 4B new specifications 3.13

1. Base case is number of hours to exceed the CRMP Potentially Risk Significant Threshold for core damage probability (1E-05) assuming no other systems are inoperable. The Base Case Action Level where compensatory action must be initiated is 1E-06, or 10% of the time allowed to the 1E-05 Base Case. Note that the proposed backstop time will establish the allowed outage time for conditions where the CRMP calculated time exceeds 30 days.

2. Containment Spray and Reactor Containment Fan Cooler action levels have no dependency on core damage frequency and are based on contributions to large early release frequency.

3. This table may include actions from proposed TS changes that are not yet approved. Differences will be reconciled when STPNOC submits the actual license amendment request. Information from proposed changes is included to provide a more accurate representation of what STPNOC expects the risk-informed application to include.

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 55 Table 3 STP Systems with Reduced Design-basis Capability in Single Train Operation System Function Affected Alternative Action Event Probability Comments Safety Injection Cannot mitigate None ( minimal cooling 1.91E-10 One train in (LHSI and HHSI) LBLOCA if the SI train is from using hot leg maintenance outage injecting into the broken recirculation) Note: Accounts for a One train fails RCS loop 25% chance of injecting One train injects into the in broken loop Leak broken loop before break not credited Safety Injection Steam line break None required 2.25E-8 DNB not expected to (HHSI) mitigation capability occur reduced Note: Accounts for a rupture either inside or outside containment.

Safety Injection Cannot mitigate Operator action per 1.75E-9 One train in (LHSI and HHSI) SBLOCA without EOPs to depressurize maintenance.

operator action if the SI Note: No credit taken for One train fails.

train is injecting into the operator action to One train of HHSI not broken RCS loop depressurize enough to match break flow Operator action is expected to be effective Residual Heat Cannot provide long Continue to inject using See Comments RHR is required Removal term cooling if only a LHSI until RHR is approximately 14 hours1.62037e-4 days 0.00389 hours 2.314815e-5 weeks 5.327e-6 months single ESF bus is restored. after event. Recovery of energized or if RHR is power to ESF bus is injecting into broken expected within 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months loop Containment Spray Iodine removal during a Monitor TSC doses and 1.97E-8 LBLOCA or SBLOCA relocate to lower dose area Note: Assuming most probable event of SBLOCA

Description of Changes and Safety Evaluation NOC-AE-03001458 Page 56 Table 3 STP Systems with Reduced Design-basis Capability in Single Train Operation System Function Affected Alternative Action Event Probability Comments Control Room Cannot maintain 1/8 Positive pressure is 7.64E-10 Envelope HVAC positive pressure expected to be maintained, so system Note: This is the is expected to be probability of a functional LBLOCA, failure of DG and LOOP while in the AOT.

Fuel Handling Cannot provide filter Provide alternate power 6.37E-11 Building HVAC path for recirculation supply from operable phase leakage if C train diesel Note: Due to design is only operable train dependencies probabilities are calculated based on trains A or B being operable Component Cooling CCW flow to RCFCs Manually isolate non- 5.75E-5 If train C is the operable Water and RHR Heat safety header to restore train, CCW flow Exchanger less than design flow. Note: Accounts for the approximates design design probability of train C flow. Effect of reduced isolating non-safety CCW flow is slight even flows without manual action.

The event probability is the likelihood of an initiating event (i.e., Large Break LOCA) with a loss of offsite power and failure of a standby diesel generator given a diesel generator is unavailable for 21 days while another train is out of service. It conservatively does not include recovery factors or support system failures.

Tech Spec Mark Up Pages 3/4.3 INSTRUMENTATION 3/4.3.1 REACTOR TRIP SYSTEM INSTRUMENTATION LIMITING CONDITION FOR OPERATION 3.3.1 As a minimum, the Reactor Trip System instrumentation channels and interlocks of Table 3.3-1 shall be OPERABLE with RESPONSE TIMES as shown in Chapter 16 in the Updated Final Safety Analysis Report (UFSAR).

APPLICABILITY: As shown in Table 3.3-1.

ACTION:

As shown in Table 3.3-1.

SURVEILLANCE REQUIREMENTS 4.3.1.1 Each Reactor Trip System instrumentation channel and interlock and the automatic trip logic shall be demonstrated OPERABLE by the performance of the Reactor Trip System Instrumentation Surveillance Requirements specified in Table 4.3-1.

4.3.1.2 The REACTOR TRIP SYSTEM RESPONSE TIME of each Reactor trip function shall be demonstrated to be within its limit at least once per 18 months. Each test shall include at least one train such that both trains are tested at least once per 36 months and one channel per function such that all channels are tested at least once every N times 18 months where N is the total number of redundant channels in a specific Reactor trip function as shown in the "Total No. of Channels" column of Table 3.3-1.

SOUTH TEXAS - UNITS 1 & 2 3/4 3-1 Unit 1 - Amendment No. 50 Unit 2 - Amendment No. 39

TABLE 3.3-1 SOUTH TEXAS - UNITS 1 & 2 REACTOR TRIP SYSTEM INSTRUMENTATION MINIMUM TOTAL NO. CHANNELS TO CHANNELS APPLICABLE FUNCTIONAL UNIT OF CHANNELS TRIP OPERABLE MODES ACTION

1. Manual Reactor Trip 2 1 2 1, 2 1 No 34 2 1 2 3*, 4*, 5* 10

2. Power Range, Neutron Flux

a. High Setpoint 4 2 3 1, 2 2

b. Low Setpoint 4 2 3 1###, 2 2 4 2 3 1, 2 2

3. Power Range, Neutron Flux High Positive Rate

4. Deleted 2 1 2 1###, 2 3

5. Intermediate Range, Neutron Flux 3/4 3-2

6. Source Range, Neutron Flux 2 1 2 2## 4

a. Startup 2 1 2 3*, 4*, 5* 10

b. Shutdown 2 0 2 3, 4, 5 4

7. Extended Range, Neutron Flux 4 2 3 1, 2 6 Unit 1 - Amendment

8. Overtemperature DT 4 2 3 1, 2 6

9. Overpower DT 4 2 3 1 6

10. Pressurizer Pressure -- Low (Interlocked with P-7) 4 2 3 1, 2 6

11. Pressurizer Pressure-- High 4 2 3 1 6

12. Pressurizer Water Level--High (Interlocked with P-7)

TABLE 3.3-1 (Continued)

SOUTH TEXAS - UNITS 1 & 2 REACTOR TRIP SYSTEM INSTRUMENTATION MINIMUM TOTAL NO. CHANNELS CHANNELS APPLICABLE FUNCTIONAL UNIT OF CHANNELS TO TRIP OPERABLE MODES ACTION No 67

13. Reactor Coolant Flow -- Low

a. Single Loop (Above P-8) 3/1oop 2/loop in any 2/loop in each 1 6 operating loop operating loop

b. Two Loops (Above P-7 and 3/loop 2/loop in two 2/loop in each 1 6 below P-8) operating loops operating loop

14. Steam Generator Water 4/stm. gen 2/stm. gen. in 3/stm. gen. 1, 2 6(1)

Level -- Low-Low any operating each operating stm. gen. stm. gen.

15. Undervoltage--Reactor Coolant 4-1/bus 2 3 1 6 3/4 3-3 Pumps (Interlocked with P-7)

16. Underfrequency -- Reactor Coolant 4-1/bus 2 3 1 6 Pumps (Interlocked with P-7)

Unit 1 - Amendment

17. Turbine Trip (Interlocked with P-9)

a. Low Emergency Trip Fluid 3 2 2 1 6 Pressure

b. Turbine Stop Valve Closure 4 2 3 1 6

TABLE 3.3-1 (Continued)

SOUTH TEXAS - UNITS 1 & 2 REACTOR TRIP SYSTEM INSTRUMENTATION MINIMUM TOTAL NO. CHANNELS CHANNELS APPLICABLE FUNCTIONAL UNIT OF CHANNELS TO TRIP OPERABLE MODES ACTION

18. Safety Injection Input from ESFAS 2 1 2 1, 2 9A

19. Reactor Trip System Interlocks

a. Intermediate Range Neutron Flux, P-6 2 1 2 2## 8

b. Low Power Reactor Trips Block, P-7 P-10 Input 4 2 3 1 8 or 3/4 3-4 P-13 Input 2 1 2 1 8

c. Power Range Neutron 4 2 3 1 8 Flux, P-8

d. Power Range Neutron 4 2 3 1 8 Flux, P-9

e. Power Range Neutron Flux, P-10 4 2 3 1, 2 8

f. Turbine Impulse Chamber Pressure P-13 2 1 2 1 8

20. Reactor Trip Breakers 2 1 2 1, 2 9, 12 2 1 2 3*, 4*, 10 5*

TABLE 3.3-1 (Continued)

SOUTH TEXAS - UNITS 1 & 2 REACTOR TRIP SYSTEM INSTRUMENTATION MINIMUM TOTAL NO. CHANNELS TO CHANNELS APPLICABLE FUNCTIONAL UNIT OF CHANNELS TRIP OPERABLE MODES ACTION

21. Automatic Trip and Interlock 2 1 2 1, 2 9A Logic 2 1 2 3*, 4*, 5* 10 3/4 3-5

TABLE 3.3-1 (Continued)

TABLE NOTATIONS

When the Reactor Trip System breakers are in the closed position and the Control Rod Drive System is capable of rod withdrawal.

1. Below the P-6 (Intermediate Range Neutron Flux Interlock) Setpoint.

1. 1. Below the P-10 (Low Setpoint Power Range Neutron Flux Interlock) Setpoint.

(1)

The applicable MODES and ACTION statement for these channels noted in Table 3.3-3 are more restrictive and, therefore, applicable.

ACTION STATEMENTS ACTION 1 - With the number of OPERABLE channels one less than the Minimum Channels OPERABLE requirement, within 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months restore the inoperable channel to OPERABLE status within 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months or apply the requirements of specification 3.13, OR be in HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months .

With the number of OPERABLE channels more than one less than the Minimum Channels OPERABLE requirement, within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months restore at least one inoperable channel to OPERABLE status or apply the requirements of specification 3.13, OR be in HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months .

ACTION 2 - With the number of OPERABLE channels one less than the Total Number of Channels, STARTUP and/or POWER OPERATION may proceed provided the following conditions are satisfied:

a. For Functional Units with installed bypass test capability, Note: A channel may be bypassed for up to 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months for surveillance testing per Specification 4.3.1.1, provided no more than one channel is in bypass at any time.

1. The inoperable channel may be placed in bypass, and must be placed in the tripped condition within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months , and

2. Either, THERMAL POWER is restricted to less than or equal to 75% of RATED THERMAL POWER and the Power Range Neutron Flux Trip Setpoint is reduced to less than or equal to 85% of RATED THERMAL POWER within 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months ; or, the QUADRANT POWER TILT RATIO is monitored at least once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months per Specification 4.2.4.2.

b. For Functional Units with no installed bypass test capability,

1. The inoperable channel is placed in the tripped condition within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months , and

2. The Minimum Channels OPERABLE requirement is met; however, the inoperable channel may be bypassed for up to 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months for surveillance testing of other channels per Specification 4.3.1.1, and

3. Either, THERMAL POWER is restricted to less than or equal to 75% of RATED THERMAL POWER and the Power Range Neutron Flux Trip Setpoint is reduced to less than or equal to 85% of RATED THERMAL POWER within 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months ; or, the QUADRANT POWER TILT RATIO is monitored at least once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months per Specification 4.2.4.2.

SOUTH TEXAS - UNITS 1 & 2 3/4 3-6 Unit 1 Amendment No.

Unit 2 Amendment No.

TABLE 3.3-1 (Continued)

ACTION STATEMENTS (Continued)

ACTION 7 - (Not Used)

ACTION 8 - With less than the Minimum Number of Channels OPERABLE, within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months determine by observation of the associated permissive annunciator window(s) that the interlock is in its required state for the existing plant condition, or apply Specification 3.0.3.

ACTION 9 - With the number of OPERABLE channels one less than the Minimum Channels OPERABLE requirement and with at least one channel functional, within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months apply the requirements of Specification 3.13 OR be in at least HOT STANDBY within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months ; however, one channel may be bypassed for up to 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months for surveillance testing per Specification 4.3.1.1, provided the other channel is OPERABLE.

ACTION 9A - With the number of OPERABLE channels one less than the Minimum Channels OPERABLE requirement and with at least one channel functional, within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months restore the inoperable channel to OPERABLE status within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months , or apply the requirements of Specification 3.13, OR be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months ; however, one channel may be bypassed for up to 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months for surveillance testing per Specification 4.3.1.1, provided the other channel is OPERABLE.

ACTION 10 - With the number of OPERABLE channels one less than the Minimum Channels OPERABLE requirement, restore the inoperable channel to OPERABLE status within 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months or open the Reactor Trip System breakers within the next hour.

ACTION 11 - (Not Used)

ACTION 12 - With one of the diverse trip features (undervoltage or shunt trip attachment) inoperable, restore it to OPERABLE status within 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months or declare the breaker inoperable and apply ACTION 9. The breaker shall not be bypassed while one of the diverse trip features is inoperable except for the time required for performing maintenance to restore the breaker to OPERABLE status.

SOUTH TEXAS - UNITS 1 & 2 3/4 3-8 Unit 1 - Amendment No.

Unit 2 - Amendment No.

INSTRUMENTATION 3/4.3.2 ENGINEERED SAFETY FEATURES ACTUATION SYSTEM INSTRUMENTATION LIMITING CONDITION FOR OPERATION 3.3.2 The Engineered Safety Features Actuation System (ESFAS) instrumentation channels and interlocks shown in Table 3.3-3 shall be OPERABLE with their Trip Setpoints set consistent with the values shown in the Trip Setpoint column of Table 3.3-4 and with RESPONSE TIMES as shown in Chapter 16 in the UFSAR.

APPLICABILITY: As shown in Table 3.3-3.

ACTION:

a. With an ESFAS Instrumentation or Interlock Trip Setpoint trip less conservative than the value shown in the Trip Setpoint column but more conservative than the value shown in the Allowable Value column of Table 3.3-4, adjust the Setpoint consistent with the Trip Setpoint value.

b. With an ESFAS Instrumentation or Interlock Trip Setpoint less conservative than the value shown in the Allowable Value column of Table 3.3-4, declare the channel inoperable and apply the applicable ACTION statement requirements of Table 3.3-3 until the channel is restored to OPERABLE status with its Setpoint adjusted consistent with the Trip Setpoint value.

c. With an ESFAS instrumentation channel or interlock inoperable, take the ACTION shown in Table 3.3-3.

SOUTH TEXAS - UNITS 1 & 2 3/4 3-16 Unit 1 - Amendment No. 50, 116 Unit 2 - Amendment No. 39, 104

INSTRUMENTATION SURVEILLANCE REQUIREMENTS 4.3.2.1 Each ESFAS instrumentation channel and interlock and the automatic acutation logic and relays shall be demonstrated OPERABLE by performance of the ESFAS Instrumentation Surveillance Requirements specified in Table 4.3.2.

4.3.2.2 The ENGINEERED SAFETY FEATURES RESPONSE TIME of each ESFAS function shall be demonstrated to be within the limit at least once per 18 months. Each test shall include at least one train so that:

a. Each logic train is tested at least once per 36 months,

b. Each actuation train is tested at least once per 54 months*, and

c. One channel per function so that all channels are tested at least once per N times 18 months where N is the total number of redundant channels in a specific ESFAS function as shown in the "Total No. of Channels" column of Table 3.3-3.

If an ESFAS instrumentation channel is inoperable due to response times exceeding the required limits, perform an engineering evaluation to determine if the test failure is a result of degradation of the actuation relays. If degradation of the actuation relays is determined to be the cause, increase the ENGINEERED SAFETY FEATURES RESPONSE TIME surveillance frequency such that all trains are tested at least once per 36 months.

SOUTH TEXAS - UNITS 1 & 2 3/4 3-17 Unit 1 - Amendment No. 50 Unit 2 - Amendment No. 39

TABLE 3.3-3 SOUTH TEXAS - UNITS 1 & 2 ENGINEERED SAFETY FEATURES ACTUATION SYSTEM INSTRUMENTATION MINIMUM TOTAL NO. CHANNELS CHANNELS APPLICABLE FUNCTIONAL UNIT OF CHANNELS TO TRIP OPERABLE MODES ACTION

1. Safety Injection (Reactor Trip, Amendment No 1 Feedwater Isolation, Control Room Standby Diesel Generators, Reactor Containment Fan Coolers, and Essential Cooling Water).

a. Manual Initiation 2 1 2 1, 2, 3, 4 19

b. Automatic Actuation Logic 2 1 2 1, 2, 3, 4 14

c. Actuation Relays 3 2 3 1, 2, 3 ,4 26 3/4 3-18 d. Containment PressureHigh -1 3 2 2 1, 2, 3 4 20

e. Pressurizer Pressure -Low 4 2 3 1, 2, 3# 20

f. Compensated Steam Line 3/steam line 2/steam line 2/steam line 1, 2, 3# 20 Pressure -Low any steam line in each steam line Unit 1 -

TABLE 3.3-3 (Continued)

SOUTH TEXAS - UNITS 1 & 2 ENGINEERED SAFETY FEATURES ACTUATION SYSTEM INSTRUMENTATION MINIMUM MINIMUM TOTAL NO. CHANNELS CHANNELS APPLICABLE FUNCTIONAL UNIT OF CHANNELS TO TRIP OPERABLE MODES ACTION

2. Containment Spray

a. Manual Initiation 2 1 with 2 1, 2, 3, 4 19 2 coincident switches

b. Automatic Actuation Logic 2 1 2 1, 2, 3, 4 14

c. Actuation Relays 3 2 3 1, 2, 3 ,4 26

d. Containment PressureHigh -3 4 2 3 1, 2, 3 17

3. Containment Isolation

a. Phase "A" Isolation

1) Manual Initiation 2 1 2 1, 2, 3, 4 19

2) Automatic Actuation Logic 2 1 2 1, 2, 3, 4 14 3/4 3-19

3) Actuation Relays 3 2 3 1, 2, 3, 4 14 26

4) Safety Injection See Item 1. above for all Safety Injection initiating functions and requirements.

TABLE 3.3-3 (Continued)

SOUTH TEXAS - UNITS 1 & 2 ENGINEERED SAFETY FEATURES ACTUATION SYSTEM INSTRUMENTATION MINIMUM TOTAL NO. CHANNELS CHANNELS APPLICABLE FUNCTIONAL UNIT OF CHANNELS TO TRIP OPERABLE MODES ACTION

3. Containment Isolation (Continued)

b. Containment Ventilation Isolation

1) Automatic Actuation Logic 2 1 2 1, 2, 3, 4 18

2) Actuation Relays*** 3 2 3 1, 2, 3, 4 18

3) Safety Injection *** See Item 1. above for all Safety Injection initiating functions and requirements.

4) RCB Purge 2 1 2 1, 2, 3, 4, 5##, 18 Radioactivity- High 6##

5) Containment Spray- See Item 2. above for Containment Spray manual initiating functions and requirements.

Manual Initiation 3/4 3-20

6) Phase "A" Isolation- See Item 3.a. above for Phase "A" Isolation manual initiating functions and requirements.

Manual Isolation

c. Phase "B" Isolation

1) Automatic Actuation Logic 2 1 2 1, 2, 3, 4 14

2) Actuation Relays 3 2 3 1, 2, 3, 4 14 26

3) Containment Pressure -- 4 2 3 1, 2, 3 17 High-3

4) Containment Spray-- See Item 2. above for Containment Spray manual initiating functions and requirements.

Manual Initiation

d. RCP Seal Injection Isolation

1) Automatic Actuation Logic 1 1 1 1, 2, 3, 4 16 Unit 1 - Amendment No. 4 and Actuation Relays

TABLE 3.3-3 (Continued)

SOUTH TEXAS - UNITS 1 & 2 ENGINEERED SAFETY FEATURES ACTUATION SYSTEM INSTRUMENTATION MINIMUM TOTAL NO. CHANNELS CHANNELS APPLICABLE FUNCTIONAL UNIT OF CHANNELS TO TRIP OPERABLE MODES ACTION

3. d. RCP Seal Injection Isolation (Continued)

2) Charging Header 1 1 1 1, 2, 3, 4 16 Pressure - Low Coincident with Phase "A" See Item 3.a. above for Phase "A" Isolation initiating functions and requirements.

Isolation

4. Steam Line Isolation

a. Manual Initiation 2/steam line 1/steam line 2/operating 1, 2, 3 24

1) Individual steam line 2 1 2 1, 2, 3 23

2) System

/4 3-21 b. Automatic Actuation Logic 2 1 2 1, 2, 3 22 and Actuation Relays

c. Steam Line Pressure - 3/steam line 2/steam line 2/ steam line 3### 20 Negative Rate -- High any steam line in each steam Unit 1 - Amendment No. 1, 4 line

d. Containment Pressure - 3 2 2 1, 2, 3 20 High - 2

e. Compensated Steam Line 3/steam line 2/steam line 2/steam line 1, 2, 3# 20 Pressure - Low any steam line in each steam line

TABLE 3.3-3 (Continued)

SOUTH TEXAS - UNITS 1 & 2 ENGINEERED SAFETY FEATURES ACTUATION SYSTEM INSTRUMENTATION MINIMUM TOTAL NO. CHANNELS CHANNELS APPLICABLE FUNCTIONAL UNIT OF CHANNELS TO TRIP OPERABLE MODES ACTION

5. Turbine Trip and Feedwater Isolation

a. Automatic Actuation 2 1 2 1, 2, 3 25 Logic and Actuation Relays

b. Steam Generator Water Level-- 4 / stm. gen. 2/ stm. gen. in any 3/stm. gen. in 1, 2, 3 20 High-High (P-14) operating stm. each operating gen. stm. gen.

c. Deleted

d. Deleted 3/4 3-22 e. Safety Injection See Item 1. for all Safety Injection initiating functions and requirements.

f. Tavg - Low coincident with 4 (1/loop) 2 3 1, 2, 3 20 Reactor Trip (P-4)

(Feedwater Isolation Only)

Unit - 1 Amendment No. 1, 4

TABLE 3.3-3 (Continued)

SOUTH TEXAS - UNITS 1 & 2 ENGINEERED SAFETY FEATURES ACTUATION SYSTEM INSTRUMENTATION MINIMUM TOTAL NO. CHANNELS CHANNELS APPLICABLE FUNCTIONAL UNIT OF CHANNELS TO TRIP OPERABLE MODES ACTION

6. Auxiliary Feedwater

a. Manual Initiation 1/pump 1/pump 1/pump 1, 2, 3 26

b. Automatic Actuation Logic 2 1 2 1, 2, 3 22

c. Actuation Relays 3 2 3 1, 2, 3 22 26

d. Stm. Gen. Water Level --

Low-Low Start Motor- 4 stm. gen. 2 stm. gen. in any 3/stm. gen. in 1, 2, 3 20 Driven Pumps and Turbine- stm. gen. each stm. gen.

Driven Pump

e. Safety Injection See Item 1. above for all Safety Injection initiating functions and requirements.

f. Loss of Power See Item 8. below for all Loss of Power initiating functions and requirements.

(Motor Driven Pumps Only)

7. Automatic Switchover to 3/4 3-23 Containment Sump****

a. Automatic Actuation Logic 3-1/train 1/train 1/train 1, 2, 3, 4 26 and Actuation Relays

b. RWST Level -- Low-Low 3-1/train 1/train 1/train 1, 2, 3, 4 26 Coincident With: See Item 1. above for all Safety Injection initiating functions and requirements.

Safety Injection

TABLE 3.3-3 (Continued)

SOUTH TEXAS - UNITS 1 & 2 ENGINEERED SAFETY FEATURES ACTUATION SYSTEM INSTRUMENTATION MINIMUM TOTAL NO. CHANNELS CHANNELS APPLICABLE FUNCTIONAL UNIT OF CHANNELS TO TRIP OPERABLE MODES ACTION Amendment No 1

8. Loss of Power

a. 4.16 kV ESF Bus Under- 4/bus 2/bus 3 /bus 1, 2, 3, 4 20A voltage-Loss of Voltage

b. 4.16 kV ESF Bus Under-voltage-Tolerable Degraded Voltage Coincident with SI 4/bus 2/bus 3/bus 1, 2, 3, 4 20A

c. 4. 16 kV ESF Bus Under-voltage - Sustained Degraded Voltage 4/bus 2/bus 3/bus 1, 2, 3, 4 20A

9. Engineered Safety Features Actuation System Interlocks

a. Pressurizer Pressure, P-11 3 2 2 1, 2, 3 21

b. Low-Low Tavg , P-12 4 2 3 1, 2, 3 21

c. Reactor Trip, P-4 2 1 2 1, 2, 3 23 3/4 3-24 Unit 1 -

TABLE 3.3-3 (Continued)

SOUTH TEXAS - UNITS 1 & 2 ENGINEERED SAFETY FEATURES ACTUATION SYSTEM INSTRUMENTATION MINIMUM TOTAL NO. CHANNELS CHANNELS APPLICABLE FUNCTIONAL UNIT OF CHANNELS TO TRIP OPERABLE MODES ACTION

10. Control Room Ventilation

a. Manual Initiation 3 (1/train) 2 (1/train) 3 (1/train) All 26 27

b. Safety Injection See Item 1. above for all Safety Injection initiating functions and requirements.

c. Automatic Actuation Logic 3 2 3 All 26 27 and Actuation Relays

d. Control Room Intake Air 2 1 2 All 28 Radioactivity - High

e. Loss of Power See Item 8. above for all Loss of Power initiating functions and requirements.

11. FHB HVAC

a. Manual Initiation 3 (1/train) 2 (1/train) 3 (1/train) 1, 2, 3, 4 or with 29, 30 irradiated fuel in spent pool

b. Automatic Actuation Logic 3 2 3 1, 2, 3, 4 or with 29, 30 and Actuation Relays irradiated fuel in 3/4 3-25 spent pool

c. Safety Injection See Item 1. above for all Safety Injection initiating functions and requirements.

d. Spent Fuel Pool Exhaust 2 1 2 With irradiated 30 Radioactivity - High fuel in spent fuel pool

TABLE 3.3-3 (Continued)

TABLE NOTATIONS

- - Function is actuated by either actuation train A or actuation train B. Actuation train C is not used for this function.

- - - Automatic switchover to containment sump is accomplished for each train using the corresponding RWST level transmitter.

Trip function may be blocked in this MODE below the P-11 (Pressurizer Pressure Interlock) Setpoint.

1. During CORE ALTERATIONS or movement of irradiated fuel within containment.

1. 1. Trip function automatically blocked above P-11 and may be blocked below P-11 when Low Compensated Steamline Pressure Protection is not blocked.

ACTION STATEMENTS ACTION 14 - With the number of OPERABLE channels one less than the Minimum Channels OPERABLE requirement and with at least one channel functional, within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months restore the inoperable channel to OPERABLE status within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months , or apply the requirements of Specification 3.13, OR be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months ; however, one channel may be bypassed for up to 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months for surveillance testing per Specification 4.3.2.1, provided the other channel is OPERABLE.

ACTION 15 - (Not Used)

ACTION 16 - With the Charging Header Pressure channel inoperable:

a) Place the Charging Header Pressure channel in the tripped condition within one hour and b) Restore the Charging Header Pressure channel to operable status within 7 days or be in at least Hot Standby within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in Cold Shutdown within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

ACTION 17 - a. With the number of OPERABLE channels one less than the Total Number of Channels, place the inoperable channel in the bypassed condition within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months , or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in at least HOT SHUTDOWN within the following 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months . One additional channel may be bypassed for up to 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months for surveillance testing per Specification 4.3.2.1.

b. With the number of OPERABLE channels more than one less than the Total Number of channels, within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months apply the requirements of Specification 3.13 or be in at least HOT SHUTDOWN within the following 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months .

ACTION 18 - With less than the Minimum Channels OPERABLE requirement, operation may continue provided the containment purge supply and exhaust valves are maintained closed.

SOUTH TEXAS - UNITS 1 & 2 3/4 3-26 Unit 1 - Amendment No. 1, 4 Unit 2 - Amendment No.

TABLE 3.3-3 (Continued)

ACTION STATEMENTS (Continued)

ACTION 19 - With the number of OPERABLE channels one less than the Minimum Channels OPERABLE requirement, within 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months restore the inoperable channel to OPERABLE status within 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months or apply the requirements of specification 3.13, OR be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months ACTION 20 - With the number of OPERABLE channels one less than the Total Number of Channels, STARTUP and/or POWER OPERATION may proceed provided the following conditions are satisfied:

a. For Functional Units with installed bypass test capability, the inoperable channel may be placed in bypass, and must be placed in the tripped condition within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months .

Note: A channel may be bypassed for up to 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months for surveillance testing per Specification 4.3.2.1, provided no more than one channel is in bypass at any time.

b. For Functional Units with no installed bypass test capability,

1. The inoperable channel is placed in the tripped condition within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months , and

2. The Minimum Channels OPERABLE requirement is met; however, the inoperable channel may be bypassed for up to 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months for surveillance testing of other channels per Specification 4.3.2.1.

ACTION 20A - a. With the number of OPERABLE channels one less than the Total Number of Channels, STARTUP and/or POWER OPERATION may proceed provided the following conditions are satisfied:

1. The inoperable channel is removed from service or placed in the tripped condition within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months , and

2. The Minimum Channels OPERABLE requirement is met; however, an inoperable channel in the tripped condition may be bypassed for up to 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months for surveillance testing of other channels per Specification 4.3.2.1.

b. With the number of OPERABLE channels two less than the Total Number of Channels, STARTUP and/or POWER OPERATION may proceed provided:

1. One inoperable channel is placed in the tripped condition and one inoperable channel is removed from service within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months , and

2. The Minimum Channels OPERABLE requirement is met; however, the inoperable channel may be bypassed for up to 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months for surveillance testing of other channels per Specification 4.3.2.1.

c. With the number of OPERABLE channels less than the Minimum Number of Channels, declare the associated load sequencer inoperable and apply the ACTION required by Technical Specification 3.8.1.1.

ACTION 21 - With less than the Minimum Number of Channels OPERABLE, within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months determine by observation of the associated permissive annunciator window(s) that the interlock is in its required state for the existing plant condition, or apply Specification 3.0.3.

SOUTH TEXAS - UNITS 1 & 2 3/4 3-27 Unit 1 - Amendment No. 24 Unit 2 - Amendment No. 14

TABLE 3.3-3 (Continued)

ACTION STATEMENTS (Continued)

ACTION 22 - With the number of OPERABLE channels one less than the Minimum Channels OPERABLE requirement, restore the inoperable channel to OPERABLE status and with at least one channel functional, within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months restore the inoperable channel to OPERABLE status or apply the requirements of specification 3.13, OR be in at least HOT STANDBY within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in at least HOT SHUTDOWN within the following 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months ; however, one channel may be bypassed for up to 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months for surveillance testing per Specification 4.3.2.1 provided the other channel is OPERABLE.

ACTION 23 - With the number of OPERABLE channels one less than the Total Number of Channels and with at least one channel functional, within 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months restore the inoperable channel(s) to OPERABLE status within 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months or apply the requirements of Specification 3.13, OR be in at least HOT STANDBY within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in at least HOT SHUTDOWN within the following 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months .

ACTION 24 - With the number of OPERABLE channels one less than the Total Number of Channels, restore the inoperable channel to OPERABLE status within 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months or declare the associated valve inoperable and take the ACTION required by Specification 3.7.1.5.

ACTION 25 - With the number of OPERABLE channels one less than the Minimum Channels OPERABLE requirement, within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months restore the inoperable channel to OPERABLE status within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months , or apply the requirements of Specification 3.13, OR be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months ; however, one channel may be bypassed for up to 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months for surveillance testing per Specification 4.3.2.1 provided the other channel is OPERABLE.

ACI'ION 26- With less than the Minimum Channels OPERABLE requirement, declare the associated system/train/component inoperable and apply the requirements of the applicable Technical Specification Action. With the number of channels OPERABLE less than the Minimum Channels OPERABLE requirement, declare the affected Auxiliary Feed Water Pump inoperable and take ACTION required by Specification 3.7.1.2.

ACTION 27- NOT USED For an inoperable channel, declare its associated ventilation train inoperable and apply the actions of Specification 3.7.7.

ACTION 28- MODES 1, 2, 3, 4: With the number of OPERABLE channels less than the Minimum Channels OPERABLE requirement, within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months isolate the Control Room Envelope and maintain operation of the ventilation System in the filtered recirculation mode.

MODES 5 and 6: With the number of OPERABLE channels less than the Minimum Channels OPERABLE requirement, within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months initiate and maintain operation of the Control Room Makeup and Cleanup Filtration System (at 100% capacity) in the recirculation and makeup filtration mode.

ACTION 29*- MODES 1, 2, 3, 4: With the number of OPERABLE channels one less than the Minimum Channels OPERABLE requirement, restore the inoperable channel to OPERABLE status within 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months or either initiate and maintain operation of the FHB exhaust air filtration system (at 100% capacity) or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

ACTION 30- With irradiated fuel in the spent fuel pool: With the number of OPERABLE channels less than the minimum Channels OPERABLE requirement, fuel movement within the spent fuel pool or crane operation with loads over the spent fuel pool may proceed provided the FHB exhaust air filtration system is in operation and discharging through at least one train of HEPA filters and charcoal absorbers.

SOUTH TEXAS - UNITS 1 & 2 3/4 3-28 Unit 1 - Amendment No.

Unit 2 - Amendment No.

INSTRUMENTATION REMOTE SHUTDOWN SYSTEM LIMITING CONDITION FOR OPERATION 3.3.3.5 The Remote Shutdown System transfer switches, power, controls and monitoring instrumentation channels shown in Table 3.3-9 shall be OPERABLE.

APPLICABILITY: MODES 1, 2, and 3.

ACTION:

a. With the number of OPERABLE remote shutdown monitoring channels, transfer switches, power or control circuits less than the Minimum Channels OPERABLE as required by Table 3.3-9, restore the inoperable channel(s) to OPERABLE status within 7 days. Otherwise, within the next 30 days submit a Special Report that defines the corrective action to be taken.

b. With the number of OPERABLE remote shutdown monitoring channels, transfer switches, power or control circuits less than the Total Number of Channels as required by Table 3.3-9, within 60 days restore the inoperable channel(s) to OPERABLE status or, pursuant to Specification 6.9.2, submit a Special Report that defines the corrective action to be taken.

c. The provisions of Specification 3.0.4 are not applicable.

SURVEILLANCE REQUIREMENTS 4.3.3.5.1 Each remote shutdown monitoring instrumentation channel shall be demonstrated OPERABLE by performance of the CHANNEL CHECK and CHANNEL CALIBRATION operations at the frequencies shown in Table 4.3-6.

4.3.3.5.2 Each Remote Shutdown System transfer switch, power and control circuit including the actuated components, shall be demonstrated OPERABLE at least once per 18 months.

SOUTH TEXAS - UNITS 1 & 2 3/4 3-61

TABLE 3.3-9 SOUTH TEXAS - UNITS 1 & 2 REMOTE SHUTDOWN SYSTEM READOUT TOTAL NO. OF MINIMUM CHANNELS INSTRUMENT LOCATION CHANNELS OPERABLE

1. Neutron Flux - Extended Range

a. Startup Rate ASP*-QDPS** 2 2

b. Flux Level ASP-QDPS 2 2

2. Reactor Trip Breaker ASP-QDPS 1/trip breaker 1/trip breaker Indication Reactor Trip Switchgear

3. Reactor Coolant Temperature-Wide Range

a. Hot Leg ASP-QDPS 4-1/loop 1/loop - 3 loops#

b. Cold Leg ASP-QDPS 4-1/loop 1/loop - 3 loops#

4. Reactor Coolant Pressure- ASP-QDPS 3 2 Wide Range/Extended Range 3/4 3-62

5. Pressurizer Water Level ASP-QDPS 4 2

6. Steam Line Pressure ASP-QDPS 4-1/steam line 1/steam line 3 steam lines#

7. Steam Generator Water Level- ASP-QDPS 4-1/steam generator 1/steam generator Wide Range 3 steam generators

TABLE 3.3-9 REMOTE SHUTDOWN SYSTEM INSTRUMENT READOUT TOTAL NO. OF MINIMUM CHANNELS LOCATION CHANNELS OPERABLE

8. Auxiliary Feedwater Flow Rate ASP-QDPS 4-1/steam generator 1/steam generator-3 steam generators

9. Auxiliary Feedwater Storage ASP-QDPS 3 2 Tank Water Level

10. (DELETED)

TRANSFER SWITCHES AND TRANSFER SWITCH CONTROLS TOTAL NO. OF MINIMUM ASSOCIATED CONTROLS LOCATIONS LOCATIONS CHANNELS CHANNELS OPERABLE

1. Steam Generator PORVs ZLP-653 (Train A) ASP 4 2#

ZLP-654 (Train B)

ZLP-655 (Train C)

ASP (Train D)

2. Reactor Head Vent Throttle ZLP-700 (Train A) ASP 2 1 Valves ZLP-701 (Train B)

3. Reactor Head Vent Isolation ZLP-700 (Train A) ASP 2 pair 1 pair Valves ZLP-701 (Train B)

4. AFW Pumps and Valves ZLP-653 (Train A- AFW Pump) ASP 4 2#

ZLP-700 (Train A- AFW Valves)

ZLP-654 (Train B - AFW Pump)

ZLP-701 (Train B - AFW Valves)

ZLP-655 (Train C - AFW Pump)

ZLP-709 (Train C - AFW Valves)

ASP (Train D)

SOUTH TEXAS - UNITS 1 & 2 3/4 3-63 Unit 1 - Amendment No. 77 Unit 2 - Amendment No. 66

TABLE 3.3-9 (Continued)

SOUTH TEXAS - UNITS 1 & 2 REMOTE SHUTDOWN SYSTEM MINIMUM TRANSFER SWITCHES AND TRANSFER SWITCH CONTROLS TOTAL NO. OF CHANNELS ASSOCIATED CONTROLS LOCATIONS LOCATIONS CHANNELS OPERABLE

5. Centrifugal Charging Pumps ZLP-653 (Train A) ASP 2 1 ZLP-655 (Train C)

6. Boric Acid Transfer Pumps ZLP-653 (Train A) ASP 2 1 ZLP-655 (Train C)

7. Pressurizer PORVs and Block ZLP-700 (Train A) ASP 2 1 Valves ZLP-701 (Train B)

8. Accumulator Discharge Isolation ZLP-653 (Train A) ASP 3 3 Valves and Power Lockouts ZLP-654 (Train B)

ZLP-655 (Train C)

9. Letdown Stop Valves ZLP-700 (Train A) ASP 2 1 ZLP-709 (Train B)

10. CCW Pumps and Heat ZLP-653 (Train A) ZLP-653

-653 (Train A) 3 2 Exchanger Outlet Valves ZLP-654 (Train B) ZLP-654 (Train B)

ZLP-655 (Train C) ZLP-655 (Train C)

11. ECW Pumps ZLP-653 (Train A) ZLP-653 (Train A) 3 2 ZLP-654 (Train B) ZLP-654 (Train B) 3/4 3-64 ZLP-655 (Train C) ZLP-655 (Train C)

12. EAB HVAC Fans ZLP-700 (Train A) ZLP-700 (Train A) 3 2 ZLP-653 (Train A - Battery Room ZLP-653 (Train A - Battery and Electrical Penetration and Electrical Penetration Space Fans) Space Fans)

ZLP-701 (Train B) ZLP-701 (Train B)

ZLP-654 (Train B - Battery Room ZLP-654 (Train B - Battery R and Electrical Penetration and Electrical Penetration Space Fans) Space Fans)

TABLE 3.3-9 (Continued)

REMOTE SHUTDOWN SYSTEM TRANSFER SWITCHES AND TRANSFER SWITCH CONTROLS TOTAL NO. OF MINIMUM ASSOCIATED CONTROLS LOCATIONS LOCATIONS CHANNELS CHANNELS OPERABLE

12. EAB HVAC Fans ZLP-709 (Train C) ZLP-709 (Train C)

(Continued) ZLP-655 (Train C- Battery Room ZLP-655 (Train C- Battery Room and Electrical Penetration Space and Electrical Penetration Space Fans) Fans)

13. Reactor Containment Fan ZLP-700 (Train A) ZLP-700 (Train A) 6 3 Coolers ZLP-701 (Train B) ZLP-701 (Train B)

ZLP-709 (Train C) ZLP-709 (Train C)

ASP - Auxiliary Shutdown Panel

- QDPS - Qualified Display Processing System

Must be in the same OPERABLE RCS loop/secondary loop.

SOUTH TEXAS - UNITS 1 & 2 3/4 3-65 Unit 1 - Amendment No. 77 Unit 2 - Amendment No. 66

INSTRUMENTATION NSTRUMENTATION ACCIDENT MONITORING INSTRUMENTATION LIMITING CONDITION FOR OPERATION 3.3.3.6 The accident monitoring instrumentation channels shown in Table 3.3-10 shall be OPERABLE.

APPLICABILITY: MODES 1, 2, and 3.

ACTION:

a. With the number of OPERABLE accident monitoring channels less than the Minimum Channels OPERABLE as required by Table 3.3-10, restore the inoperable channel(s) to OPERABLE status within 7 days. Otherwise, within the next 30 days submit a Special Report that defines the corrective action to be taken.

b. With the number of OPERABLE accident monitoring channels less than the Total Number of Channels as required by Table 3.3-10, within 60 days restore the inoperable channel(s) to OPERABLE status or submit a Special Report that defines the corrective action to be taken.

c. The provisions of Specification 3.0.4 are not applicable.

SURVEILLANCE REQUIREMENTS 4.3.3.6 Each accident monitoring instrumentation channel shall be demonstrated OPERABLE by performance of the CHANNEL CHECK and CHANNEL CALIBRATION at the frequencies shown in Table 4.3-7.

SOUTH TEXAS - UNITS 1 & 2 3/4 3-67 Unit 1 - Amendment No.

Unit 2 - Amendment No.

SOUTH TEXAS - UNITS 1 & 2 TABLE 3.3-10 ACCIDENT MONITORING INSTRUMENTATION Amendment No. 14, 23 MINIMUM TOTAL NO. CHANNELS INSTRUMENT OF CHANNELS OPERABLE ACTION

1. Containment Pressure 4 1 43

2. Reactor Coolant Outlet Temperature- 1/loop 1/loop 35 T HOT (Wide Range)

3. Reactor Coolant Outlet Temperature- 1/loop 1/loop 35 T COLD (Wide Range)

4. Reactor Coolant Pressure - Wide Range 3 1 37 3/4 3-68 and Extended Range

5. Pressurizer Water Level 4 1 43

6. Steam Line Pressure 4/steam generator 1/steam generator 43

7. Steam Generator Water Level - 4/steam generator 1/steam generator 43 Narrow Range Unit 2 - Amendment No. 4,

8. Steam Generator Water Level - 1/steam generator 1/steam generator 35 Wide Range

9. Refueling Water Storage Tank Water Level 3 1 44 Unit 1 -

10. Auxiliary Feedwater Storage Tank Water Level 3 1 44

11. Auxiliary Feedwater Flow 1/steam generator 1/steam generator 44

12. Reactor Coolant System Subcooling 2 1 36 Margin Monitoring

TABLE 3.3-10 ACCIDENT MONITORING INSTRUMENTATION MINIMUM TOTAL NO. CHANNELS INSTRUMENT OF CHANNELS OPERABLE ACTION

13. Containment Water Level 2 1 36 (Narrow Range)

14. Containment Water Level (Wide Range) 3 1 37

15. Core Exit Thermocouples **2 **1 42

16. Steam Line Radiation Monitor 1/steam line 1/steam line 40

17. Containment - High Range Radiation Monitor 2 1 39

18. Reactor Vessel Water Level (RVWL) 2* 1* 41

19. Neutron Flux (Extended Range) 2 1 36

20. Containment Hydrogen Concentration 2 1 36

21. Containment Pressure (Extended Range) 2 1 36

22. Steam Generator Blowdown Radiation Monitor 1/blowdown line 1/blowdown line 40

23. Neutron Flux - Startup Rate 2 1/steam generator 36 (Extended Range)

A channel is eight sensors in a probe. A channel is OPERABLE if four or more sensors, on e or more in the upper section section and three or more in the lower section, are OPERABLE.

- A channel is OPERABLE if at least two core exit thermocouples per core quadrant are OPERABLE, and at least one quadrant has at least four OPERABLE thermocouples SOUTH TEXAS - UNITS 1 & 2 3/4 3-69 Unit 1 - Amendment No. 77 Unit 2 - Amendment No. 66

TABLE 3.3-10 (Continued)

ACTION STATEMENTS ACTION 35 - With the number of OPERABLE channels less than the Minimum Channels Operable requirement, restore at least one inoperable channel to OPERABLE status within 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months , or be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months .

ACTION 36 - a. With the number of OPERABLE channels one less than the Total Number of Channels requirements, restore one inoperable channel to OPERABLE status within 7 days, or be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months .

b. With the number of OPERABLE channels less than the Minimum Channels Operable requirements, restore at least one inoperable channel to OPERABLE status within 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months , or be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months .

ACTION 37 a. With the number of OPERABLE channels one less than the Total Number of Channels requirements, restore the inoperable channel to OPERABLE status within 31 days, or be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months .

b. With the number of OPERABLE channels two less than the Total Number of Channels requirement, restore at least one inoperable channel to OPERABLE status within 7 days, or be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months .

c. With the number of OPERABLE channels less than the Minimum Channels Operable requirement, restore at least one inoperable channel to OPERABLE status within 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months or be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months .

ACTION 38 a. With the number of OPERABLE channels one less than the Total Number of Channels requirements, restore the inoperable channel to OPERABLE status within 90 days, or be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months .

b. With the number of OPERABLE channels two less than the Total Number of Channels requirements, restore the inoperable channel to OPERABLE status within 31 days, or be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months .

c. With the number of OPERABLE channels three less than the Total Number of Channels requirement, restore at least one inoperable channel to OPERABLE status within 7 days, or be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months .

d. With the number of OPERABLE channels less than the Minimum Channels Operable requirement, restore at least one inoperable channel to OPERABLE status within 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months or be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months .

SOUTH TEXAS - UNITS 1 & 2 3/4 3-70

TABLE 3.3-10 (Continued)

ACTION STATEMENTS (Continued)

ACTION 39 - a. With the number of OPERABLE channels one less than the Total Number of Channels requirements, restore one inoperable channel to OPERABLE status within 30 days, or submit a report in accordance with Specification 6.9.2 within the next 14 days outlining the preplanned alternate method of monitoring, the cause of the inoperability, and the plans and schedule for restoring the inoperable instrumentation channels to OPERABLE status.

b. With the number of OPERABLE channels less than the Minimum Channels OPERABLE requirements, restore at least one inoperable channel to OPERABLE status within 7 days, or submit a report in accordance with Specification 6.9.2 within the next 14 days outlining the preplanned alternate method of monitoring, the cause of the inoperability, and the plans and schedule for restoring the inoperable instrumentation channels to OPERABLE status.

ACTION 40 - a. With the number of OPERABLE channels less than the Minimum Channels OPERABLE requirements and with a functional diverse Channel, restore at least one inoperable channel to OPERABLE status within 30 days, or submit a report in accordance with Specification 6.9.2 within the next 14 days outlining the preplanned alternate method of monitoring, the cause of the inoperability, and the plans and schedule for restoring the inoperable instrumentation channels to OPERABLE status.

b. With the number of Channels less than the Minimum Channels OPERABLE requirement, and with the diverse channel not functional, restore at least one inoperable Channel to operable status within 7 days or submit a report in accordance with Specification 6.9.2 within the next 14 days outlining the preplanned alternate method of monitoring, the cause of the inoperability, and the plans and schedule for restoring the inoperable instrumentation channels to OPERABLE status.

ACTION 41 - a. With the number of OPERABLE channels one less than the Required Number of Channels, either restore the system to OPERABLE status within 7 days if repairs are feasible without shutting down or prepare and submit a Special Report to the Commission pursuant to Specification 6.9.2 within 30 days following the event outlining the action taken, the cause of the inoperability and the plans and schedule for restoring the system to OPERABLE status.

b. With the number of OPERABLE Channels one less than the Minimum Channels OPERABLE in Table 3.3-10, either restore the inoperable channel(s) to OPERABLE status within 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months if repairs are feasible without shutting down or:

1. Initiate an alternate method of monitoring the reactor vessel inventory;

2. Prepare and submit a Special Report to the Commission pursuant to Specification 6.9.2 within 30 days following the event outlining the action taken, the cause of the inoperability and the plans and schedule for restoring the system to OPERABLE status; and

3. Restore the system to OPERABLE status at the next scheduled refueling.

ACTION 42 - a. With one required channel inoperable, restore the required channel to OPERABLE status within 30 days; otherwise, a report shall be prepared and submitted in accordance with Specification 6.9.2 within the next 14 days. The report shall outline the preplanned alternate method of monitoring, the cause of the inoperability, and the plans and schedule for restoring the instrumentation channels to OPERABLE status.

b. With two required channels inoperable, restore one required channel to OPERABLE status within 7 days; otherwise, be in HOT STANDBY within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months , and in HOT SHUTDOWN in the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months .

SOUTH TEXAS - UNITS 1 & 2 3/4 3-71 Unit 1 - Amendment No.

Unit 2 - Amendment No.

TABLE 3.3-10 (Continued)

ACTION STATEMENTS (Continued)

ACTION 43 - a. With the number of OPERABLE channels two less than the Total Number of Channels requirements, restore the inoperable channel to OPERABLE status within 31 days, or be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months .

b. With the number of OPERABLE channels three less than the Total Number of Channels requirement, restore at least one inoperable channel to OPERABLE status within 7 days, or be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months .

c. With the number of OPERABLE channels less than the Minimum Channels Operable requirement, restore at least one inoperable channel to OPERABLE status within 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months or be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months .

ACTION 44 - With the number of OPERABLE channels less than the Total Number of Channels requirements, declare the affeected mechanical train inoperable and apply the requirements of the appropriate specification.

SOUTH TEXAS - UNITS 1 & 2 3/4 3-72 Unit 1 - Amendment No. 14, Unit 2 - Amendment No. 4,

INSTRUMENTATION 3/4.3.5 ATMOSPHERIC STEAM RELIEF VALVE INSTRUMENTATION LIMITING CONDITION FOR OPERATION:

3.3.5.1 The atmospheric steam relief valve instrumentation shown in Table 3.3-14 shall be OPERABLE.

APPLICABILITY: As shown in Table 3.3-14 ACTION: As shown in Table 3.3-14 SURVEILLANCE REQUIREMENTS:

4.3.5.1 Perform a CHANNEL CHECK on each atmospheric steam relief valve automatic actuation channel at least once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months .

4.3.5.2 Perform a CHANNEL CALIBRATION on each atmospheric steam relief valve automatic actuation channel at a nominal setpoint of 1225 psig +/- 7 psi at least once every 18 months.

4.3.5.3 Perform an ANALOG CHANNEL OPERATIONAL TEST on each atmospheric steam relief valve automatic actuation channel at a nominal setpoint of 1225 psig + 7 psi at least once every 18 months.

SOUTH TEXAS - UNITS 1 & 2 3/4 3-85 Unit 1- Amendment No. 114 Unit 2 - Amendment No. 102

SOUTH TEXAS - UNITS 1 & 2 TABLE 3.3-14 ATMOSPHERIC STEAM RELIEF VALVE INSTRUMENTATION No. 114 REQUIRED NO. OF APPLICABLE FUNCTIONAL UNIT CHANNELS MODES ACTION Manual actuation control 4 1, 2, 3, 4* 1 channels (1 / valve)

Automatic actuation control 4 1, 2# 1 channels (1 / valve) 3/4 3-86 Unit 1 - Amendment

TABLE 3.3-14 (Continued)

TABLE NOTATIONS

When steam generators are being used for decay heat removal.

Atmospheric steam relief valve(s) may be in manual operation and open, or in automatic operation, to maintain secondary side pressure at or below an indicated steam generator pressure of 1225 psig.

ACTION STATEMENTS ACTION 1 - With the number of OPERABLE channels less than the required number of channels, declare the affected valve(s) inoperable and apply Technical Specification 3.7.1.6.

ACTION 2 - a. With one less than the required number of OPERABLE channels, restore the inoperable channel to OPERABLE status within 7 days; or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months .

b. With two less than the required number of OPERABLE channels, restore at least three channels to OPERABLE status within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months ; or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months .

SOUTH TEXAS - UNITS 1& 2 3/4 3-87 Unit 1 - Amendment No.

Unit 2 - Amendment No.

REACTOR COOLANT SYSTEM OPERATING LIMITING CONDITION FOR OPERATION 3.4.2.2 All pressurizer Code safety valves shall be OPERABLE with a lift setting1 of 2485 psig +/-

2%.2 APPLICABILITY: MODES 1, 2, and 3.

ACTION:

With one or more pressurizer Code safety valves inoperable, within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months either restore the inoperable valves to OPERABLE status within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months or apply the requirements of Specification 3.13, or be in at least HOT STANDBY within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in at least HOT SHUTDOWN within the following 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months .

SURVEILLANCE REQUIREMENTS 4.4.2.2 No additional requirements other than those required by Specification 4.0.5.

1 The lift setting pressure shall correspond to ambient conditions of the valve at nominal operating temperature and pressure.

2 The as left lift setting shall be within +/-1% following valve testing.

SOUTH TEXAS - UNITS 1 & 2 3/4 4-8 Unit 1 - Amendment No. 59, 78 Unit 2 - Amendment No. 47, 67

REACTOR COOLANT SYSTEM 3/4.4.4 RELIEF VALVES LIMITING CONDITION FOR OPERATION 3.4.3 Both power-operated relief valves (PORVs) and their associated block valves shall be OPERABLE.

APPLICABILITY: MODES 1, 2, and 3.

ACTION:

a. With one or both PORV(s) inoperable, because of excessive seat leakage, within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months either restore the PORV(s) to OPERABLE status or close the associated block valve(s) with power maintained to the block valve(s); otherwise apply the requirements of Specification 3.13, OR be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in HOT SHUTDOWN within the following 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months .

b. With one PORV inoperable due to causes other than excessive seat leakage, within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months either restore the PORV to OPERABLE status or close the associated block valve and remove power from the block valve; within the following 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months restore the PORV to OPERABLE status within the following 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months or apply the requirements of Specification 3.13, OR be in HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in HOT SHUTDOWN within the following 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months .

c. With both PORVs inoperable due to causes other than excessive seat leakage, within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months either restore at least one of the PORVs to OPERABLE status or close their associated block valves and remove power from the block valves and apply the requirements of Specification 3.13, OR be in HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and HOT SHUTDOWN within the following 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months .

d. With one block valve inoperable, within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months restore the block valve to operable status or place its associated PORV in closed position; within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months restore the block valve to operable status within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months or apply the requirements of Specification 3.13; otherwise, be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in HOT SHUTDOWN within the following 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months .

e. With both block valves inoperable, within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months restore the block valves to operable status or place the associated PORVs in the closed position; restore at least one block valve to OPERABLE status within the next hour or apply the requirements of Specification 3.13; otherwise, be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in HOT SHUTDOWN within the following 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months .

f. The provisions of Specification 3.0.4 are not applicable SOUTH TEXAS - UNITS 1 & 2 3/4 4-10 Unit 1 - Amendment No. 55 Unit 2 - Amendment No. 44

3/4.5 EMERGENCY CORE COOLING SYSTEMS 3/4.5.1 ACCUMULATORS LIMITING CONDITION FOR OPERATION 3.5.1 Each Safety Injection System accumulator shall be OPERABLE APPLICABILITY: MODES 1 and 2 MODE 3 with pressurizer pressure > 1000 psig ACTION:

a. With one or more accumulators inoperable, except as a result of boron concentration outside the required limits, within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months restore the inoperable accumulator(s) to OPERABLE status within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months or apply the requirements of Specification 3.13, OR be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and reduce pressurizer pressure to less than 1000 psig within the following 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months .

b. With the boron concentration of one or more accumulators outside the required limit, within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months restore the boron concentration to within the required limits within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months or apply the requirements of Specification 3.13, OR be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and reduce pressurizer pressure to less than 1000 psig within the following 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months .

SURVEILLANCE REQUIREMENTS 4.5.1.1 Each accumulator shall be demonstrated OPERABLE:

a. At least once per 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months by:

1) Verifying the contained borated water volume is ³ 8800 gallons and £ 9100 gallons and nitrogen cover-pressure is ³ 590 psig and £ 670 psig, and

2) Verifying that each accumulator isolation valve is open.

b. At least once per 31 days and within 6 hour6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months s* after each solution volume increase of greater than or equal to 1% of tank volume that is not the result of addition from the RWST by verifying the boron concentration of the accumulator solution is ³ 2700 ppm and

£ 3000 ppm and

c. At least once per 31 days when the RCS pressure is above 1000 psig by verifying that power to the isolation valve operator is removed.

The 6 hr. SR is only required to be performed for affected accumulators SOUTH TEXAS - UNITS 1 & 2 3/4 5-1 Unit 1 - Amendment No. 51, 54, 59, 135 Unit 2 - Amendment No. 40, 43, 47, 124

EMERGENCY CORE COOLING SYSTEMS 3/4.5.2 ECCS SUBSYSTEMS - TAVG GREATER THAN OR EQUAL TO 350°F LIMITING CONDITION FOR OPERATION 3.5.2 Three independent Emergency Core Cooling System (ECCS) subsystems shall be OPERABLE with each subsystem comprised of:

a. One OPERABLE High Head Safety Injection pump,

b. One OPERABLE Low Head Safety Injection pump,

c. One OPERABLE RHR heat exchanger, and

d. An OPERABLE flow path capable of taking suction from the refueling water storage tank on a Safety Injection signal and automatically transferring suction to the containment sump during the recirculation phase of operation through a High Head Safety Injection pump and into the Reactor Coolant System and through a Low Head Safety Injection pump and its respective RHR heat exchanger into the Reactor Coolant System.

APPLICABILITY: MODES 1, 2, and 3.*

ACTION:

a. With less than the above subsystems OPERABLE, but with at least two High Head Safety Injection pumps in an OPERABLE status, two Low Head Safety Injection pumps and associated RHR heat exchangers in an OPERABLE status, and sufficient flow paths to accommodate these OPERABLE Safety Injection pumps and RHR heat exchangers,**

within 7 days restore the inoperable subsystem(s) to OPERABLE status within 7 days or apply the requirements of Specification 3.13, OR be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in HOT SHUTDOWN within the following 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months .

b. With less than two of the required subsystems OPERABLE, within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months restore at least one subsystem to OPERABLE status AND apply the requirements of Specification 3.13, OR be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in HOT SHUTDOWN within the following 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months .

c. In the event the ECCS is actuated and injects water into the Reactor Coolant System, a Special Report shall be prepared and submitted to the Commission pursuant to Specification 6.9.2 within 90 days describing the circumstances of the actuation and the total accumulated actuation cycles to date. The current value of the usage factor for each affected Safety Injection nozzle shall be provided in this Special Report whenever its value exceeds 0.70.

The provisions of Specifications 3.0.4 and 4.0.4 are not applicable for entry into MODE 3 for the Safety Injection pumps declared inoperable pursuant to Specification 4.5.3.1.2 provided that the Safety Injection pumps are restored to OPERABLE status within 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months or prior to the temperature of one or more of the RCS cold legs exceeding 375oF, whichever comes first.

- Verify required pumps, heat exchangers and flow paths OPERABLE every 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months .

SOUTH TEXAS - UNITS 1 & 2 3/4 5-3 Units 1 - Amendment No. 4, 59 Units 2 - Amendment No. 47

EMERGENCY CORE COOLING SYSTEMS 3/4.5.3 ECCS SUBSYSTEMS - Tavg LESS THAN 350oF LIMITING CONDITION FOR OPERATION 3.5.3.1 As a minimum, the following ECCS components shall be OPERABLE:

a. Two OPERABLE High Head Safety Injection pumps,*

b. Two OPERABLE Low Head Safety Injection pumps and their associated RHR heat exchangers, and

c. Two OPERABLE flow paths capable of taking suction from the refueling water storage tank upon being manually realigned and transferring suction to the containment sump during the recirculation phase of operation through a High Head Safety Injection pump and into the Reactor Coolant System and through a Low Head Safety Injection pump and its respective RHR heat exchanger into the Reactor Coolant System.

APPLICABILITY: MODE 4.

ACTION:

a. With less than the above-required ECCS components OPERABLE because of the inoperability of either the High Head Safety Injection pumps or the flow paths from the refueling water storage tank, within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months restore at least the required ECCS components to OPERABLE status within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months or apply the requirements of Specification 3.13, OR be in COLD SHUTDOWN within the next 20 hours2.314815e-4 days 0.00556 hours 3.306878e-5 weeks 7.61e-6 months .

b. With less than the above-required ECCS components OPERABLE because of the inoperability of either the residual heat removal heat exchangers or the Low Head Safety Injection pumps, restore at least the required ECCS components to OPERABLE status or maintain the Reactor Coolant System Tavg less than 350oF by use of alternate heat removal methods.

c. In the event the ECCS is actuated and injects water into the Reactor Coolant System, a Special Report shall be prepared and submitted to the Commission pursuant to Specification 6.9.2 within 90 days describing the circumstances of the actuation and the total accumulated actuation cycles to date. The current value of the usage factor for each affected Safety Injection nozzle shall be provided in this Special Report whenever its value exceeds 0.70.

A maximum of one High Head Safety Injection pump shall be OPERABLE and a second High Head Safety Injection pump shall be OPERABLE except that its breaker shall be racked out (the third HHSI pump shall have its breaker racked out) within: (1) 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months after entering MODE 4 from MODE 3 or prior to the temperature of one or more of the RCS cold legs decreasing below 325oF, whichever comes first; or (2) 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months after entering MODE 4 from MODE 5 or prior to the temperature of one or more of the RCS cold legs exceeding 225oF, whichever comes first.

SOUTH TEXAS - UNITS 1 & 2 3/4 5-6

EMERGENCY CORE COOLING SYSTEMS 3/4.5.5 REFUELING WATER STORAGE TANK LIMITING CONDITION FOR OPERATION 3.5.5 The refueling water storage tank (RWST) shall be OPERABLE with:

a. A minimum contained borated water volume of 458,000 gallons, and

b. A boron concentration between 2800 ppm and 3000 ppm.

APPLICABILITY: MODES 1, 2, 3, and 4.

ACTION:

With the RWST inoperable, within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months restore the tank to OPERABLE status within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months or apply the requirements of Specification 3.13, OR be in at least HOT STANDBY within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

SURVEILLANCE REQUIREMENTS 4.5.5 The RWST shall be demonstrated OPERABLE at least once per 7 days by:

a. Verifying the contained borated water volume in the tank, and

b. Verifying the boron concentration of the water.

SOUTH TEXAS - UNITS 1 & 2 3/4 5-10 Unit 1 - Amendment No. 51, 54 Unit 2 - Amendment No. 40, 43

EMERGENCY CORE COOLING SYSTEMS 3/4.5.6 RESIDUAL HEAT REMOVAL (RHR) SYSTEM LIMITING CONDITION FOR OPERATION 3.5.6 Three independent Residual Heat Removal (RHR) loops shall be OPERABLE with each loop comprised of:

a. One OPERABLE RHR pump,

b. One OPERABLE RHR heat exchanger, and

c. One OPERABLE flowpath capable of taking suction from its associated RCS hot leg and discharging to its associated RCS cold leg.*

APPLICABILITY: MODES 1, 2 and 3.

ACTION:

a. With one RHR loop inoperable, within 7 days restore the required loop to OPERABLE status within 7 days or apply the requirements of Specification 3.13, OR be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in HOT SHUTDOWN within the following 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months .

b. With two RHR loops inoperable, within 24 restore at least two RHR loops to OPERABLE status within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months or apply the requirements of Specification 3.13, OR be in at least HOT STANDBY within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in HOT SHUTDOWN within the following 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months .

c. With three RHR loops inoperable, immediately initiate corrective action to restore at least one RHR loop to OPERABLE status as soon as possible.

SURVEILLANCE REQUIREMENTS 4.5.6.1 Each RHR loop shall be demonstrated OPERABLE on a STAGGERED TEST BASIS pursuant to the requirements of Specification 4.0.5.

4.5.6.2 At least once per 18 months by verifying automatic interlock action of the RHR system from the Reactor Coolant System to ensure that:

a. With a simulated or actual Reactor Coolant System pressure signal greater than or equal to 350 psig, the interlocks prevent the valves from being opened.

Valves MOV-0060 A, B, and C and MOV-0061 A, B, and C may have power removed to support the FHAR (Fire Hazard Analysis Report) assumptions.

SOUTH TEXAS - UNITS 1 & 2 3/4 5-11 Unit 1 - Amendment No. 4, 41, 59 Unit 2 - Amendment No. 18 , 47

CONTAINMENT SYSTEMS CONTAINMENT VENTILATION SYSTEM LIMITING CONDITION FOR OPERATION 3.6.1.7 Each containment purge supply and exhaust isolation valve shall be OPERABLE and:

a. Each 48-inch containment shutdown purge supply and exhaust isolation valve shall be closed and sealed closed, and

b. The 18-inch supplementary containment purge supply and exhaust isolation valves shall be closed to the maximum extent practicable but may be open for supplementary purge system operation for pressure control, for ALARA and respirable air quality considerations for personnel entry and for surveillance tests that require the valves to be open.

APPLICABILITY: MODES 1, 2, 3, and 4.

ACTION:

a. With a 48-inch containment purge supply and/or exhaust isolation valve open or not sealed closed, within 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months close and/or seal close that valve or isolate the penetration(s) within 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months , otherwise or apply the requirements of Specification 3.13, OR be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

b. With the 18-inch supplementary containment purge supply and/or exhaust isolation valve(s) open for reasons other than given in Specification 3.6.1.7.b. above, within 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months close the open 18-inch valve(s) or isolate the penetration(s) within 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months , or apply the requirements of Specification 3.13, OR otherwise be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months , and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

c. With a containment purge supply and/or exhaust isolation valve(s) having a measured leakage rate in excess of the limits of Specifications 4.6.1.7.2 and/or 4.61.7.3, within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months restore the inoperable valve(s) to OPERABLE status or isolate the penetrations so that the measured leakage rate does not exceed the limits of Specifications 4.6.1.7.2 and/or 4.6.1.7.3 within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months or apply the requirements of Specification 3.13; otherwise be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months , and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

SOUTH TEXAS - UNITS 1 & 2 3/4 6-12

CONTAINMENT SYSTEMS 3/4.6.2 DEPRESSURIZATION AND COOLING SYSTEMS CONTAINMENT SPRAY SYSTEM LIMITING CONDITION FOR OPERATION 3.6.2.1 Three independent Containment Spray Systems shall be OPERABLE with each Spray System capable of taking suction from the RWST and transferring suction to the containment sump.

APPLICABILITY: MODES 1, 2, 3, and 4.

ACTION:

a. With one Containment Spray System inoperable, within 7 days restore the inoperable Spray System to OPERABLE status within 7 days or apply the requirements of Specification 3.13, OR be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months ; restore the inoperable Spray System to OPERABLE status within the next 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months or be and in COLD SHUTDOWN within the following 30 36 hours4.166667e-4 days 0.01 hours 5.952381e-5 weeks 1.3698e-5 months .

b. With more than one Containment Spray System inoperable, within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months restore the inoperable Spray System to OPERABLE status or apply the requirements of Specification 3.13, OR be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 36 hours4.166667e-4 days 0.01 hours 5.952381e-5 weeks 1.3698e-5 months .

SURVEILLANCE REQUIREMENTS 4.6.2.1 Each Containment Spray System shall be demonstrated OPERABLE:

a. At least once per 31 days by verifying that each valve (manual, power-operated, or automatic) in the flow path that is not locked, sealed, or otherwise secured in position, is in its correct position;

b. By verifying on a STAGGERED TEST BASIS, that on recirculation flow, each pump develops a differential pressure of greater than or equal to 283 psid when tested pursuant to Specification 4.0.5;

c. At least once per 18 months during shutdown, by:

1) Verifying that each automatic valve in the flow path actuates to its correct position on a Containment Pressure High 3 test signal, and

2) Verifying that each spray pump starts automatically on a Containment Pressure High 3 test signal coincident with a sequencer start signal.

d. At least once per 10 years by performing an air or smoke flow test through each spray header and verifying each spray nozzle is unobstructed.

SOUTH TEXAS - UNITS 1 & 2 3/4 6-14 Unit 1 - Amendment No. 59, 94 Unit 2 - Amendment no. 47, 81

CONTAINMENT SYSTEMS CONTAINMENT COOLING SYSTEM LIMITING CONDITION FOR OPERATION 3.6.2.3 Three independent groups of Reactor Containment Fan Coolers (RCFC) shall be OPERABLE with a minimum of two units in two groups and one unit in the third group.

APPLICABILITY: MODES 1, 2, 3, and 4.

ACTION:

a. With one group of the above required Reactor Containment Fan Coolers inoperable, within 7 days restore the inoperable group of RCFC to OPERABLE status within 7 days or apply the requirements of Specification 3.13, OR be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

b. With more than one group of the above required Reactor Containment Fan Coolers inoperable, within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months restore at least two groups of RCFC to OPERABLE status or apply the requirements of Specification 3.13, OR be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

SURVEILLANCE REQUIREMENTS 4.6.2.3 Each group of Reactor Containment Fan Coolers shall be demonstrated OPERABLE:

a. At least once per 92 days by:

1) Starting each non-operating fan group from the control room, and verifying that each fan group operates for at least 15 minutes, and

2) Verifying a component cooling water flow rate of greater than or equal to 1800 gpm to each cooler.

a. At least once per 18 months by verifying that each fan group starts automatically on a Safety Injection test signal.

SOUTH TEXAS - UNITS 1 & 2 3/4 6-16 Units 1 - Amendment No. 30,59, 74 Units 2 - Amendment No. 21,47, 63

PLANT SYSTEMS AUXILIARY FEEDWATER SYSTEM LIMITING CONDITION FOR OPERATION 3.7.1.2 Four independent steam generator auxiliary feedwater pumps and associated flow paths shall be OPERABLE with:

a. Three motor-driven auxiliary feedwater pumps, each capable of being powered from separate emergency busses, and

b. One steam turbine-driven auxiliary feedwater pump capable of being powered from an OPERABLE steam supply system.

APPLICABILITY: MODES 1, 2, and 3.

Simple extension ACTION: to backstop time

a. With one motor-driven auxiliary feedwater pump inoperable, restore the pump to OPERABLE status within 3028 days.

b. With the turbine-driven auxiliary feedwater pump inoperable, or with any two auxiliary feedwater pumps inoperable, within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months restore the affected auxiliary feedwater pump(s) to OPERABLE status within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months or apply the requirements of Specification 3.13. The provisions of Specification 3.0.4 are not applicable for entry into Mode 3 for the turbine-driven pump.

c. With three auxiliary feedwater pumps inoperable, or if the required action and associated allowed outage time for a) or b) is not met, be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in HOT SHUTDOWN within the following 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months .

d. With four auxiliary feedwater pumps inoperable, immediately initiate action to restore at least one auxiliary feedwater pump to OPERABLE status as soon as possible. LCO 3.0.3 and all other LCO actions requiring Mode changes are suspended until one of the four inoperable auxiliary feedwater pumps is restored to OPERABLE status.

SOUTH TEXAS - UNITS 1 & 2 3/4 7-4 Unit 1 - Amendment No.

Unit 2 - Amendment No.

PLANT SYSTEMS AUXILIARY FEEDWATER STORAGE TANK LIMITING CONDITION FOR OPERATION 3.7.1.3 The auxiliary feedwater storage tank (AFST) shall be OPERABLE with a contained water volume of at least 485,000 gallons of water.

APPLICABILITY: MODES 1, 2, and 3.

ACTION:

With the AFST inoperable, within 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months restore the AFST to OPERABLE status or apply the requirements of Specification 3.13, OR be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in HOT SHUTDOWN within the following 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months .

SURVEILLANCE REQUIREMENTS 4.7.1.3 The AFST shall be demonstrated OPERABLE at least once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months by verifying the contained water volume is within its limits.

SOUTH TEXAS - UNITS 1 & 2 3/4 7-6 Unit 1 - Amendment No. 33 Unit 2 - Amendment No. 24

PLANT SYSTEMS This specification is marked up assuming NRC approval of STP MAIN STEAM LINE ISOLATION VALVES application of 5/2002.

LIMITING CONDITION FOR OPERATION 3.7.1.5 Each main steam line isolation valve (MSIV) shall be OPERABLE.

APPLICABILITY: MODE 1 MODES 2 and 3 except when all MSIVs are closed and deactivated ACTION:

MODE 1:

With one or more MSIV(s) inoperable but open, POWER OPERATION may continue provided the inoperable valve(s) is restored to OPERABLE status or the requirements of Specification 3.13 are applied within 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months ; otherwise be in HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in HOT SHUTDOWN within the following 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months .

MODES 2 and 3:

With one or more MSIV(s) inoperable, subsequent operation in MODE 2 or 3 may proceed provided the isolation valve(s) is/are closed within 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months and verified closed every 7 days. Otherwise, be in HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in HOT SHUTDOWN within the following 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months .

SURVEILLANCE REQUIREMENTS 4.7.1.5 Each MSIV shall be demonstrated OPERABLE by verifying full closure within 5 seconds when tested pursuant to Specification 4.0.5. The provisions of Specification 4.0.4 are not applicable for entry into MODE 3.

Separate Limiting Condition for Operation entry is allowed for each MSIV.

SOUTH TEXAS - UNITS 1 & 2 3/4 7-9

PLANT SYSTEMS ATMOSPHERIC STEAM RELIEF VALVES LIMITING CONDITION FOR OPERATION 3.7.1.6 At least four atmospheric steam relief valves shall be OPERABLE.

APPLICABILITY: MODES 1, 2, 3, and 4.*

ACTION:

a. With one less than the required atmospheric steam relief valves OPERABLE, within 7 days restore the required atmospheric steam relief valves to OPERABLE status within 7 days; or apply the requirements of Specification 3.13 OR be in at least HOT STANDBY with the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in HOT SHUTDOWN within the following 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and place the required RCS/RHR loops in operation for decay heat removal.

b. With two or more less than the required atmospheric relief valves OPERABLE, within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months restore at least three atmospheric relief valves to OPERABLE status within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months or apply the requirements of Specification 3.13 OR be in at least HOT STANDBY with the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in HOT SHUTDOWN within the following 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and place the required RCS/RHR loops in operation for decay heat removal.

SURVEILLANCE REQUIREMENTS 4.7.1.6 Each atmospheric relief valve shall be demonstrated OPERABLE prior to startup following any COLD SHUTDOWN of 30 days or longer or following any refueling shutdown, by verifying that all valves will open and close fully by operation of automatic and manual controls.

When steam generators are being used for decay heat removal.

SOUTH TEXAS - UNITS 1 & 2 3/4 7-10 Unit 1 - Amendment No. 4, 114 Unit 2 - Amendment No. 102

Mark-up is based on NRC approval of PLANT SYSTEMS STP application of 5/2002.

MAIN FEEDWATER SYSTEM LIMITING CONDITION FOR OPERATION 3.7.1.7 Each main feedwater isolation valve (MFIV) shall be OPERABLE.

APPLICABILITY: MODES 1, 2, and 3 except when MFIV is closed and deactivated.

ACTION:

With one or more MFIV(s) inoperable, within 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months close or isolate the inoperable valve(s) within 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months , OR verify within 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months that the Main Feed Regulating Valve(s) (MFRV) in the same flow path(s) is/are available to perform feedwater isolation AND within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months apply the requirements of Specification 3.13, OR close or isolate the MFIV(s) within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months and verify the valve(s) closed every 7 days.

Otherwise, be in MODE 3 within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and be in MODE 4 within the following 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months .

SURVEILLANCE REQUIREMENTS 4.7.1.7 Each MFIV shall be demonstrated OPERABLE by verifying full closure within 10 seconds when tested pursuant to Specification 4.0.5. The provisions of specification 4.0.4 are not applicable for entry into MODE 3.

Separate Limiting Condition for Operation entry is allowed for each MFIV.

SOUTH TEXAS - UNITS 1 & 2 3/4 7-10a Unit 1 - Amendment No.

Unit 2 - Amendment No.

PLANT SYSTEMS 3/4.7.3 COMPONENT COOLING WATER SYSTEM LIMITING CONDITION FOR OPERATION 3.7.3 At least three independent component cooling water loops shall be OPERABLE.

APPLICABILITY: MODES 1, 2, 3, and 4.

ACTION:

a. With only two component cooling water loops OPERABLE, within 7 days restore at least three loops to OPERABLE status within 7 days or apply the requirements of Specification 3.13, OR be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

b. With two or more component cooling water loops inoperable, within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months restore at least two loops to OPERABLE status or apply the requirements of Specification 3.13, OR be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

SURVEILLANCE REQUIREMENTS 4.7.3 At least three component cooling water loops shall be demonstrated OPERABLE:

a. At least once per 31 days by verifying that each valve outside containment (manual, power-operated, or automatic) servicing safety-related equipment that is not locked, sealed, or otherwise secured in position is in its correct position; and

b. At least once per 18 months by verifying that:

1) Each automatic valve servicing safety-related equipment or isolating the non-nuclear safety portion of the system actuates to its correct position on a Safety Injection, Loss of Offsite Power, Containment Phase B Isolation, or Low Surge Tank test signal, as applicable (performed during shutdown);

2) Each Component Cooling Water System pump starts automatically on a Safety Injection or Loss of Offsite Power test signal (performed during shutdown); and

3) The surge tank level instrumentation which provides automatic isolation of portions of the system is demonstrated OPERABLE by performance of a CHANNEL CALIBRATION test.

c. By verifying that each valve inside containment (manual, power-operated, or automatic) servicing safety-related equipment that is not locked, sealed, or otherwise secured in position is in its correct position prior to entering MODE 4 following each COLD SHUTDOWN of greater than 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months if not performed within the previous 31 days.

SOUTH TEXAS - UNITS 1 & 2 3/4 7-12 Unit 1 - Amendment No. 4,59, 91 Unit 2 - Amendment 47, 78

PLANT SYSTEMS 3/4.7.4 ESSENTIAL COOLING WATER SYSTEM LIMITING CONDITION FOR OPERATION 3.7.4 At least three independent essential cooling water loops shall be OPERABLE.

APPLICABILITY: MODES 1, 2, 3, and 4.

ACTION:

a. With only two essential cooling water loops OPERABLE, within 7 days restore at least three loops to OPERABLE status within 7 days or apply the requirements of Specification 3.13, OR be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

b. With two or more essential cooling water loops inoperable, within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months restore at least two loops to OPERABLE status or apply the requirements of Specification 3.13, OR be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

SURVEILLANCE REQUIREMENTS 4.7.4 At least three essential cooling water loops shall be demonstrated OPERABLE:

a. At least once per 31 days by verifying that each valve (manual, power-operated, or automatic) servicing safety-related equipment that is not locked, sealed, or otherwise secured in position is in its correct position;

b. At least once per 18 months during shutdown, by verifying that:

1) Each Essential Cooling Water automatic valve in the flow path that is not locked, sealed, or otherwise secured in position, actuates to the correct position on an actual or simulated actuation signal, and

2) Each Essential Cooling Water pump starts automatically on an actual or simulated signal.

SOUTH TEXAS - UNITS 1 & 2 3/4 7-13 Unit 1 - Amendment No. 126 Unit 2 - Amendment No. 115 PLANT SYSTEMS

3/4.7.7 CONTROL ROOM MAKEUP AND CLEANUP FILTRATION SYSTEM LIMITING CONDITION FOR OPERATION 3.7.7 Three independent Control Room Makeup and Cleanup Filtration Systems shall be OPERABLE.

APPLICABILITY: All MODES.

ACTION:

MODES 1, 2, 3, and 4:

a. With one Control Room Makeup and Cleanup Filtration System inoperable, within 7 days restore the inoperable system to OPERABLE status within 7 days or apply the requirements of Specification 3.13, OR be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

b. With two Control Room Makeup and Cleanup Filtration Systems inoperable, within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months restore at least two systems to OPERABLE status within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months or apply the requirements of Specification 3.13, OR be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

c. With three Control Room Makeup and Cleanup Filtration Systems inoperable, suspend all operations involving movement of spent fuel, and crane operation with loads over the spent fuel pool, and within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months restore at least one system to OPERABLE status within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months or apply the requirements of Specification 3.13, OR be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

MODES 5 and 6:

a. With one Control Room Makeup and Cleanup Filtration System inoperable, restore the inoperable system to OPERABLE status within 7 days or initiate and maintain operation of the remaining OPERABLE Control Room Makeup and Cleanup Filtration Systems in the recirculation and makeup air filtration mode, or suspend all operations involving CORE ALTERATIONS, operations involving positive reactivity additions that could result in loss of required SHUTDOWN MARGIN or required boron concentration, movement of spent fuel, and crane operation with loads over the spent fuel pool.

b. With more than one Control Room Makeup and Cleanup Filtration System inoperable, or with the OPERABLE Control Room Makeup and Cleanup Filtration Systems required to be in the recirculation and makeup air filtration mode by ACTION a. not capable of being powered by an OPERABLE emergency power source, suspend all operations involving CORE ALTERATIONS, operations involving positive reactivity additions that could result in loss of required SHUTDOWN MARGIN or required boron concentration, movement of spent fuel, and crane operations with loads over the spent fuel pool.

SURVEILLANCE REQUIREMENTS 4.7.7 Each Control Room Makeup and Cleanup Filtration System shall be demonstrated OPERABLE:

a. At least once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months by verifying that the control room air temperature is less than or equal to 78°F;

b. At least once per 92 days on a STAGGERED TEST BASIS by initiating, from the control room, flow through the HEPA filters and charcoal adsorbers of the makeup and cleanup air filter units and verifying that the system operates for at least 10 continuous hours with the makeup filter unit heaters operating; SOUTH TEXAS - UNITS 1 & 2 3/4 7-16 Unit 1 - Amendment No. 59, 125, 128 Unit 2 - Amendment No. 47, 113, 117

PLANT SYSTEMS 3/4.7.8 FUEL HANDLING BUILDING (FHB) EXHAUST AIR SYSTEM LIMITING CONDITION FOR OPERATION 3.7.8 The FHB Exhaust Air System comprised of the following components shall be OPERABLE.

a. Two independent exhaust air filter trains,

b. Three exhaust ventilation trains.

APPLICABILITY: MODES 1, 2, 3, and 4.

ACTION:*

a. With one FHB exhaust air filter train inoperable, within 7 days restore the inoperable filter train to OPERABLE status within 7 days or apply the requirements of Specification 3.13, OR be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN in the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

b. With two FHB exhaust air filter trains inoperable, within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months restore at least one inoperable filter train to OPERABLE status within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months or apply the requirements of Specification 3.13, OR be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN in the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

c. With one FHB exhaust ventilation train inoperable, within 7 days restore the inoperable exhaust ventilation train to OPERABLE status within 7 days or apply the requirements of Specification 3.13, OR be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN in the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

d. With more than one FHB exhaust ventilation train inoperable, within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months restore at least two exhaust ventilation trains to OPERABLE status within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months or apply the requirements of Specification 3.13, OR be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN in the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

SURVEILLANCE REQUIREMENTS 4.7.8 The Fuel Handling Building Exhaust Air System shall be demonstrated OPERABLE:

a. At least per 31 days on a STAGGERED TEST BASIS by initiating, from the control room, flow through the HEPA filters and charcoal absorbers and verifying that the system operates for at least 10 continuous hours with the heaters operating with two of the three exhaust booster fans and two of the three main exhaust fans operating to maintain adequate air flow rate;

b. At least once per 18 months and (1) after any structural maintenance on the HEPA filter or charcoal absorber housings, or (2) following painting, fire, or chemical release in any ventilation zone communicating with the system by:

1) Verifying that the cleanup system satisfies the in-place penetration and bypass leakage testing acceptance criteria of less than 0.05% for HEPA filter banks and 0.10% for charcoal absorber banks and uses the test procedure guidance in Regulatory Positions C.5.a, C.5.c, and C.5.d of Regulatory Guide 1.52, Revision 2, March 1978, and the system flow rate is 29,000 cfm + 10%.

2) Verifying, within 31 days after removal, that a laboratory analysis of a representative carbon sample obtained in accordance with Regulatory Position C.6.b of Regulatory Guide 1.52, SOUTH TEXAS - UNITS 1 & 2 3/4 7-19 Unit 1 - Amendment No. 125 Unit 2 - Amendment No. 100, 113

PLANT SYSTEMS 3/4.7.14 ESSENTIAL CHILLED WATER SYSTEM LIMITING CONDITION FOR OPERATION 3.7.14 At least three independent Essential Chilled Water System loops shall be OPERABLE.

APPLICABILITY: MODES 1, 2, 3, and 4.

ACTION:

a. With only two Essential Chilled Water System loops OPERABLE, within 7 days restore at least three loops to OPERABLE status within 7 days or apply the requirements of Specification 3.13, OR be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

b. With two or more Essential Chilled Water System loops inoperable, within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months restore at least two loops to OPERABLE status or apply the requirements of Specification 3.13, OR be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months SURVEILLANCE REQUIREMENTS 4.7.14 The Essential Chilled Water System shall be demonstrated OPERABLE by:

a. Performance of surveillances as required by Specification 4.0.5, and

b. At least once per 18 months by demonstrating that the system starts automatically on a Safety Injection test signal.

SOUTH TEXAS - UNITS 1 & 2 3/4 7-33 Unit 1 - Amendment No. 85 Unit 2 - Amendment No. 72

Includes proposed requirements for an automatic load sequencer, 3/4.8 ELECTRICAL POWER SYSTEMS submitted on 2/14/2002.

3/4.8.1 A.C. SOURCES OPERATING LIMITING CONDITION FOR OPERATION 3.8.1.1 As a minimum, the following A.C. electrical power sources shall be OPERABLE.

a. Two physically independent circuits between the offsite transmission network and the onsite Class 1E Distribution System(l), and

b. Three separate and independent standby diesel generators, each with a separate fuel tank containing a minimum volume of 60,500 gallons of fuel, and an automatic load sequencer.

APPLICABILITY: MODES 1, 2, 3, and 4.

ACTION:

a. With one offsite circuit of the above-required A.C. electrical power sources inoperable, demonstrate the OPERABILITY of the remaining A.C. sources by performing Surveillance Requirement 4.8.1.1.1.a within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months and at least once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months thereafter. Within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months restore the offsite circuit to OPERABLE status within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months or apply the requirements of Specification 3.13, OR be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and in COLD SHUTDOWN within the following 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

b. With a standby diesel generator inoperable, demonstrate the OPERABILITY of the above-required A.C. offsite sources by performing Surveillance Requirement 4.8.1.1.1.a within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months and at least once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months thereafter. If the standby diesel generator became inoperable due to any cause other than an inoperable support system, an independently testable component, or preplanned preventive maintenance or testing, demonstrate the OPERABILITY of the remaining OPERABLE standby diesel generators by performing Surveillance Requirement 4.8.1.1.2.a.2) for each such standby diesel generator separately within 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months , unless it can be demonstrated there is no common mode failure for the remaining diesel generator(s). Within 14 days restore the inoperable standby diesel generator to OPERABLE status within 14 days or apply the requirements of Specification 3.13, OR be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and in COLD SHUTDOWN within the following 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

c. With one offsite circuit of the above-required A.C. electrical power sources and one standby diesel generator inoperable, demonstrate the OPERABILITY of the remaining A.C. sources by performing Specification 4.8.1.1.1a. within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months and at least once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months thereafter; and if the standby diesel generator became inoperable due to any cause other than an inoperable support system, an independently testable component, or preplanned preventive SOUTH TEXAS - UNITS 1 & 2 3/4 8-1 Unit 1 - Amendment No. 68, 85 Unit 2 - Amendment No. 57, 72

ELECTRICAL POWER SYSTEMS LIMITING CONDITION FOR OPERATION ACTION (Continued) maintenance or testing, demonstrate the OPERABILITY of the remaining OPERABLE standby diesel generator(s) by performing Surveillance Requirement 4.8.1.1.2a.2) within 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months , unless it can be demonstrated there is no common mode failure for the remaining diesel generators; within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months restore at least one of the inoperable sources to OPERABLE status within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months or apply the requirements of Specification 3.13, OR be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months . Restore at least two offsite circuits to OPERABLE status within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months and three standby diesel generators to OPERABLE status within 14 days from the time of initial loss or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

d. With one standby diesel generator inoperable in addition to ACTION b. or c. above, verify that within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months apply the requirements of Specification 3.13, OR be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

1. All required systems, subsystems, trains, components, and devices that depend on the remaining OPERABLE diesel generators as a source of emergency power are also OPERABLE, and

2. When in MODE 1, 2, or 3, the steam-driven auxiliary feedwater pump is OPERABLE.

If these conditions are not satisfied within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

e. With two of the above required offsite A.C. circuits inoperable, within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months restore at least one of the inoperable offsite sources to OPERABLE status within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months or apply the requirements of Specification 3.13, OR be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months . With only one offsite source restored, restore at least two offsite circuits to OPERABLE status within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months from time of initial loss or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

f. With two or three of the above required standby diesel generators inoperable, demonstrate the OPERABILITY of two offsite A.C. circuits by performing the requirements of Specification 4.8.1.1.1a.

within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months and at least once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months thereafter; within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months restore at least one standby diesel generator to OPERABLE status within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months AND apply the requirements of Specification 3.13, OR at least two standby diesel generators to OPERABLE status within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months . Restore at least three standby diesel generators to OPERABLE status within 14 days from time of initial loss or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

g. With one required load sequencer inoperable, within 7 days restore the inoperable load sequencer to operable status within 7 days or apply the requirements of Specification 3.13, OR be in HOT SHUTDOWN within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and in COLD SHUTDOWN within the following 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

h. With one required load sequencer inoperable and one required standby diesel generator not associated with the inoperable sequencer also inoperable or with more than one required load sequencer inoperable, within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months restore the inoperable load sequencer(s) and/or the inoperable standby diesel generator not associated with the inoperable load sequencer to OPERABLE status within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months or apply the requirements of Specification 3.13, OR be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

SOUTH TEXAS - UNITS 1 & 2 3/4 8-2 Unit 1 - Amendment No. 68, 85 Unit 2 - Amendment No. 57, 72

ELECTRICAL POWER SYSTEMS 3/4.8.2 D.C. SOURCES OPERATING LIMITING CONDITION FOR OPERATION 3.8.2.1 As a minimum, the following D.C. electrical sources shall be OPERABLE:

a. Channel I 125-volt Battery Bank E1A11(Unit 1), E2A11 (Unit 2) and one of its two associated chargers,

b. Channel II 125-volt Battery Bank E1D11 (Unit 1), E2D11 (Unit 2) and one of its two associated full capacity chargers,

c. Channel III 125-volt Battery Bank E1B11 (Unit 1), E2B11 (Unit 2) and one of its two associated full capacity chargers, and

d. Channel IV 125-volt Battery Bank E1C11 (Unit 1), E2C11 (Unit 2) and one of its two associated chargers.

APPLICABILITY: MODES 1, 2, 3, and 4.

ACTION:

With less than the required battery banks or battery chargers OPERABLE, within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months restore the inoperable battery bank or battery charger or apply the requirements of Specification 3.13, OR be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

a. With one of the required battery banks inoperable, restore the inoperable battery bank to OPERABLE status within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

b. With no battery chargers for a channel OPERABLE, restore at least one battery charger to OPERABLE status within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

SURVEILLANCE REQUIREMENTS 4.8.2.1 Each 125-volt battery bank and charger shall be demonstrated OPERABLE:

a. At least once per 7 days by verifying that:

1) The parameters in Table 4.8-2 meet the Category A limits, and

2) The total battery terminal voltage is greater than or equal to 129 volts on float charge.

SOUTH TEXAS - UNITS 1 & 2 3/4 8-10 Unit 1 - Amendment No. 4, 73 Unit 2 - Amendment No. 62

ELECTRICAL POWER SYSTEMS 3/4.8.3 ONSITE POWER DISTRIBUTION OPERATING LIMITING CONDITION FOR OPERATION 3.8.3.1 The following electrical busses shall be energized in the specified manner:

a. Train A A.C. ESF Busses consisting of:

1) 4160-Volt ESF Bus # ElA (Unit 1), E2A (Unit 2), and

2) 480-Volt ESF Busses # ElAl and EIA2 (Unit 1), E2Al and E2A2 (Unit 2) from respective load center transformers.

b. Train B A.C. ESF Busses consisting of:

1) 4160-Volt ESF Bus # ElB (Unit 1), E2B (Unit 2), and

2) 480-Volt ESF Busses # E1B1 and ElB2 (Unit 1), E2Bl and E2B2 (Unit 2) from respective load center transformers.

c. Train C A.C. ESF Busses consisting of:

1) 4160-Volt ESF Bus # ElC (Unit 1), E2C (Unit 2), and

2) 480-Volt ESF Busses # ElCl and ElC2 (Unit 1), E2Cl and E2C2 (Unit 2) from respective load center transformers.

d. 120-Volt A.C. Vital Distribution Panels DP1201 and DP001 energized from their associated inverters connected to D.C. Bus # ElAll* (Unit 1), E2All* (Unit 2), .

e. 120-Volt A.C. Vital Distribution Panel DP1202 energized from its associated inverter connected to D.C. Bus # ElDll* (Unit 1), E2Dll* (Unit 2),

f. 120-Volt A.C. Vital Distribution Panel DP1203 energized from its associated inverter connected to D.C. Bus # ElBll* (Unit 1), E2Bll* (Unit 2),

g. 120-Volt A. C. Vital Distribution Panels DP1204 and DP002 energized from their associated inverters connected to D. C. Bus #E1C11* (Unit 1), E2C11* (Unit 2),

h. 125-Volt D. C. Bus E1A11 (Unit 1) E2A11 (Unit 2) energized from Battery Bank E1A11 (Unit 1), E2A11 (Unit 2),

i. 125-Volt D. C. Bus E1D11 (Unit 1) E20D11 (Unit 2) energized from Battery Bank E1D11 (Unit 1), E2D11 (Unit 2),

j. 125-Volt D. C. Bus E1B11 (Unit 1) E2B11 (Unit 2) energized from Battery Bank E1B11 (Unit 1), E2B11 (Unit 2), and

k. 125-Volt D. C. Bus E1C11 (Unit 1) E2C11 (Unit 2) energized from Battery Bank E1C11 (Unit 1), E2C11 (Unit 2).

The inverter(s) associated with one channel may be disconnected from its D.C. bus for up to 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months as necessary, for the purpose of performing an equalizing charge on its associated battery bank provided: (1) its vital distribution panels are energized, and (2) the vital distribution panels associated with the other battery banks are energized from their associated inverters and connected to their associated D.C. busses.

SOUTH TEXAS - UNITS 1 & 2 3/4 8-14 Unit 1 - Amendment No. 4

ELECTRICAL POWER SYSTEMS LIMITING CONDITION FOR OPERATION (Continued)

APPLICABILITY: MODES 1, 2, 3, and 4.

ACTION:

a. With one of the required trains of A.C. ESF busses not fully energized, within 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months reenergize the train within 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months or apply the requirements of Specification 3.13, OR be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

b. With one or more A.C. vital distribution panel(s) either not energized from its associated inverter, or with the inverter not connected to its associated D.C. bus:

(1) within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months reenergize the A.C. distribution panel(s) or apply the requirements of Specification 3.13 , OR be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months ; AND (2) within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months reenergize the A.C. vital distribution panel(s) from its associated inverter connected to its associated D.C. bus within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months or apply the requirements of Specification 3.13, OR be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

c. With one or more D.C. bus(es) not energized from its associated battery bank, within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months reenergize the D.C. bus(es) from its associated battery bank within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months or apply the requirements of Specification 3.13, OR be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

SURVEILLANCE REQUIREMENTS 4.8.3.1 The specified busses shall be determined energized in the required manner at least once per 7 days by verifying correct breaker alignment and indicated voltage on the busses.

SOUTH TEXAS - UNITS 1 & 2 3/4 8-15

RISK MANAGEMENT ALLOWED OUTAGE TIME DETERMINATIONS LIMITING CONDITION FOR OPERATION 3.13.1 When referred to this specification, equipment that has been removed from service or declared inoperable shall be evaluated for its impact on plant risk and allowed outage times determined accordingly.

APPLICABILITY: As required by the referencing specification(s)

ACTION:

Determine that the configuration is acceptable for Completion Time extension beyond the

[Front Stop AOT],

AND Determine that the configuration is acceptable for continued operation beyond the [Front Stop AOT] whenever configuration changes occur that may affect plant risk, AND Restore required inoperable [subsystem, component] to OPERABLE status within the Acceptable Allowed Outage Time Extension or 30 days, whichever is shorter.

Note: The 30-day limitation may be applied individually to each specification for which Specification 3.13.1 has been entered.

OR Take the ACTION(s) required in the referencing specification(s) for required action or completion time not met SURVEILLANCE REQUIREMENTS 4.13.1: As required by the referencing specification(s)

SOUTH TEXAS - UNITS 1 & 2 3/4 13-1 Unit 1 - Amendment No.

Unit 2 - Amendment No.

Bases for Specification 3.13.1 Specification 3.13.1 establishes provisions for performing a risk assessment to determine required actions and allowed outage times for specifically identified specifications for structures, systems, and components. Application of the risk assessment is consistent with the requirements of the Maintenance Rule, 10CFR50.65(a)(4), to assess and manage the increase in risk that may result from maintenance activities. The process to manage the risk assesses the rate of accumulation of risk in plant configurations and determines the allowed outage time by calculating the time required to cross a Potentially Risk Significant Threshold (1.0E-05).

Application of the risk assessment to manage allowed time in different plant configurations is complemented by the stations programs to monitor performance indicators for long-term availability of risk-significant components. The requirement to achieve acceptable long-term performance indicators provides a significant disincentive to the potential to regularly extend baseline allowed outage times to the detriment of availability.

TS 3.13.1.a establishes the conditions for performance of the risk assessment. The LCOs subject to the configuration risk management program specifically reference TS 3.13.1. The baseline allowed outage time or required completion time specified in the LCO may be used to apply the TS 3.13.1 to determine an alternate allowed outage time and compensatory actions. The requirement to continuously determine the acceptability of the plant means that once the subject LCO has exceeded the baseline allowed outage time, the risk assessment must be reperformed as needed to determine the required action and time limits for any LCO that subsequently becomes inoperable. This requirement provides assurance that the configuration risk is adequately assessed. In a configuration with multiple LCOs inoperable, the risk assessment may determine that the allowed outage time is shorter than what would be allowed by the baseline time in the affected LCOs. With more than one LCO inoperable, the baseline time for a subsequent inoperable LCO might also be a non-conservative time to perform a risk assessment to determine the appropriate required action and time. Consequently, the risk assessment process may also be applied to determine how much time is available to perform a risk assessment for subsequent inoperable LCOs.

TS 3.13.1 is applied with the referencing specification and the ACTION required by the referencing specification must be taken if the configuration risk exceeds the Potentially Risk Significant Threshold. It recognizes that the plant is in an extended allowed outage time that has a specified required action if the required action time is exceeded. In a configuration where the risk exceeds the Potentially Risk Significant Threshold, the calculated allowed outage time has been exceeded and the action required at the expiration of LCO allowed outage time must be taken. If more than one LCO is beyond its frontstop time, the LCO with the most limiting required action must be followed.

TS 3.13.1 establishes a backstop allowed outage time of 30 days. This backstop allowed outage time prevents allowing a component with little or no risk significance from being inoperable indefinitely and resulting in a defacto change to the design or licensing basis of the plant. The note allows the 30-day backstop to be applied individually to specifications for which TS 3.13.1 is being used.

Implementation Examples NOC-AE-03001458 Attachment 3 Implementation Examples

Implementation Examples NOC-AE-03001458 Attachment 3 The examples in this attachment depict how the risk-informed Technical Specifications and the Configuration Risk Management Program would be applied. As discussed earlier, STPNOC's implementation of the risk-informed Technical Specifications will be generally consistent with the NEI Risk-informed Technical Specifications Risk Management Guide.

Implementation Examples NOC-AE-03001458 Attachment 3 Example 1: Routine Train A work week with emergent Train B condition This example illustrates how the Technical Specifications would be applied for situation where there is a train of equipment out of service for planned maintenance and a risk-significant component on a different train is found to be inoperable. Current TS for the condition below would require entry into TS 3.0.3 for the second inoperable HHSI train. This would subsequently require the plant to be shutdown within a few hours unless STNOC was granted enforcement discretion by the NRC.

Application of the proposed risk-informed TS would allow STP to determine the appropriate allowed outage time for the condition where the second HHSI train was inoperable. The example demonstrates that there is adequate time for the plant to address the emergent condition without shutting down or requesting enforcement discretion.

Time Event Frontstop Calculated Risk Comment (hh:mm) AOT (/hr)

(time to reach 1E-05) 00:00 Begin Train A work HHSI (3.5.2.a): 7 days NA, planned 5.9E-09 Routine planned maintenance week (SDG, ECW, CCW (3.7..3.a): 7 days to remain CCW, HHSI) ECW (3.7.4.a): 7 days within SDG (3.8.1.1.b): 14 days frontstop allowed outage time.

24:00 Train B HHSI found 3.5.2.b: 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months to apply TS 24 days 1.7E-08 Emergent condition where CTS would to be inoperable 3.13 require TS 3.0.3 entry. RITS permits the station to address the condition with normal work controls.

36:00 Train B HHSI Exit TS 3.5.2.b and TS 3.13 NA 5.9E-09 restored applicability.

Back on the work week clock with 36 hours4.166667e-4 days 0.01 hours 5.952381e-5 weeks 1.3698e-5 months elapsed.

Implementation Examples NOC-AE-03001458 Attachment 3 Example 2: Emergent condition while in configuration where TS 3.13 is in use This example illustrates how the TS would be applied in a situation where a frontstop AOT has been extended by use of TS 3.13 and there is a subsequent emergent condition involving an inoperable risk-significant component. The recalculated AOT of 27 days when the TDAFW pump is found to be inoperable also accounts for the days that the ECW pump has been out of service.

Time Event Frontstop Calculated Risk Comment (hh:mm) AOT (/hr)

(time to reach 1E-05 00:00 ECW pump TS 3.7.4.a: 7 days 1 train of 4.5E-09 TS 3.13 requirements apply after 7 days.

replacement (Also makes associated ECW could The risk is calculated from the time the expected to last 10 SDG inoperable) be allowed ECW is taken out of service.

days. OOS up to the 30-day backstop 8 days Turbine-driven TS 3.7.1.2.b: 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months 27 days 1.5E-08 Regardless of the frontstop time for the AFW found to be TS 3.8.1.1.d: 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months TDAFW pump, TS 3.13 applies because inoperable the ECW has gone beyond its frontstop.

TS 3.13 requires a determination of the acceptability of the configuration with the additional inoperable TDAFW.

Application of the CRMP would determine the configuration is acceptable.

9 days ECW pump is TS 3.7.1.2.b: 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months less > 30 days 1.5E-09 The condition that caused TS 3.13 to restored the 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months that have (backstop apply has been exited and there are no TS transpired. would apply) beyond their frontstop time. The frontstop AOT may be applied to the TDAFW.

Implementation Examples NOC-AE-03001458 Attachment 3 Example 3: Same as Example 2, except that the emergent condition is restored first Time Event Frontstop Calculated Risk Comment (hh:mm) AOT (/hr)

(time to reach 1E-05) 00:00 ECW pump TS 3.7.4.a: 7 days 1 train of 4.5E-09 TS 3.13 requirements apply after 7 days.

replacement ECW could The risk is calculated from the time the expected to last 10 be allowed ECW is taken out of service days. OOS up to the 30-day backstop 8 days Turbine-driven TS 3.7.1.2.b: 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months 27 days 1.5E-08 Regardless of the frontstop time for the AFW found to be TS 3.8.1.1.d: 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months TDAFW pump, TS 3.13 applies because inoperable the ECW has gone beyond its frontstop.

TS 3.13 requires a determination of the acceptability of the configuration with the additional inoperable TDAFW.

Application of the CRMP would determine the configuration is acceptable.

9 days TD AFW restored NA > 30 days 4.5E-09 TS 3.13 still applies. TDAFW no longer contributes to risk calculation. A new completion time may be calculated.

PRA Quality NOC-AE-03001458 Attachment 4 PRA Quality

PRA Quality NOC-AE-03001458 Attachment 4 Page 1 As stated in the cover letter, STPNOC proposes that this application be used as a pilot for draft Regulatory Guide (DG) 1122, "An Approach for Determining the Technical Adequacy of Probabilistic Risk Assessment Results for Risk-Informed Activities".

STPNOC has determined that the preparing and submitting the information required by DG-1122 will require a substantial effort. This submittal contains an outline with some preliminary information. The remainder of the information will be included in future submittals.

Description of the STP PRA The STP PRA is a full-scope Level 1 / 2 PRA that incorporates internal events, inclusive of fires/floods, and external events (seismic, fire, flood). STPs PRA features a seismic PRA, flood PRA (including spatial interactions analysis), human reliability analysis, and detailed common cause modeling. The model is quantified using the RISKMAN software code that has met station and industry software quality assurance requirements. The PRA is maintained and updated under a PRA configuration control program in accordance with station procedures. This program is governed by procedure. Periodic reviews and updates, if necessary, for plant changes (includes as a minimum performance data, procedures, and modifications) by qualified personnel with independent reviews and approvals.

STPNOC has used the PRA for risk-informed insights and applications since the mid-1980s.

The NRC has previously reviewed the STP PRA in support of approving the following risk-informed licensing applications:

1. Amendment Nos. 59 & 47, dated February 17, 1994 (initial application made in 1990). The application extended the allowed outage times for 10 LCOs and the intervals for 3 surveillance tests.

2. Amendment Nos. 85 & 72, dated October 31, 1996. The application extended the allowed outage time for the standby diesel generators and their associated support systems.

3. Amendment Nos. 125 & 113, dated September 26, 2000. The application relaxed LCO requirements for control room and fuel handling building HVAC.

4. Approval of Exemption to Special Treatment Requirements, dated August 3, 2001.

The application relaxed regulatory requirements for various degrees of special treatment provisions for safety related components (Option 2 Pilot).

5. Amendment Nos. 135 & 124, dated January 10, 2002. The application extended the allowed outage time for ECCS Accumulators consistent with WCAP-15049-A and relaxed accumulator surveillance requirements consistent with Westinghouse Improved Technical Specifications.

6. Amendment Nos. 143 & 131, dated September 17, 2002. The application allowed a one extension of integrated leak rate test to 15 years.

7. Amendment Nos. 146 & 134, dated December 31, 2002. The application extended the allowed outage time for auxiliary feedwater.

PRA Quality NOC-AE-03001458 Attachment 4 Page 2 In addition to the risk-informed licensing applications above, STPNOC has used the STP PRA to provide additional insight to other licenses amendments and to respond to NRC questions.

The following references are evaluations of the STP PRA that have been performed by the NRC and others:

1. NRC SER related to the STP Probabilistic Safety Assessment, dated January 21, 1992, documented favorable conclusions with regard to the STP PRA, including its treatment of fire (done to support the review for Amendment Nos. 59 & 47, above).

2. 2002 Peer Review In April 2002, STPs PRA underwent an industry peer review performed in accordance with NEI-00-02, Industry PRA Peer Review Process. All technical elements within the scope of the peer review were graded as sufficient to support application requiring the capabilities of a grade 2 (e.g., risk ranking applications).

Most of the elements were further graded as sufficient to support application requiring the capabilities defined for grade 3 (e.g., risk-informed applications supported by deterministic insights). The general assessment of the peer reviewers was that STPs PRA could effectively be used to support applications involving risk significance determinations supported by deterministic analyses once the items noted in the element summaries and Fact & Observations (F&O) sheets were addressed.

Using STPs Corrective Action program as a tracking mechanism, all F&O items identified by the peer team have been completed and are incorporated into the latest revision of the STP PRA (Revision 4). The STP PRA Revision 4 model is the basis for this application of Risk-Informed Technical Specifications.

DG-1122 Required Information The information described below will be provided to demonstrate that the parts of the STP PRA are of sufficient quality to support the analyses used in this application

A description of the process for maintenance, update, and control of the PRA.

Identification of changes to design or operational practices whose impacts have not been incorporated in the PRA model used to support the application, and either a justification of why this does not impact the results used or the results of a sensitivity study to demonstrate that the impact is not significant.

Documentation that the parts of the PRA required to produce the results used in the decision are performed consistently with the standard or peer review process as endorsed in the appendices to this regulatory guide, or a discussion of the impact of not meeting the standard or the criteria of the peer review process on the results and either a justification of why this does not impact the results used or the results of a sensitivity study that demonstrate that the impact is not significant.

PRA Quality NOC-AE-03001458 Attachment 4 Page 3

A characterization of the assumptions and approximations that have a significant impact on the results used in the decision-making process. This characterization also includes the peer reviewers assessment of those assumptions. These characterizations provide information that the NRC staff may find useful to support the assessment of whether the use of these assumptions and approximations is either appropriate for the application, or whether sensitivity studies performed to support the decision are appropriate.

A discussion of the resolution of the peer review comments that are applicable to the parts of the PRA required for the application. This may take the form of: (1) a discussion of how the PRA model has been changed, (2) a justification of why the particular issue raised does not impact the results used, or (3) the results of a sensitivity study that demonstrate that the impact is not significant.

NOC-AE-03001458, Letter of Intent to Submit a Broad-Scope Risk-Informed Technical Specification Amendment Request

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NOC-AE-03001458, Letter of Intent to Submit a Broad-Scope Risk-Informed Technical Specification Amendment Request

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3. Background

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