NL-14-0649, Units 1 and 2 License Amendment Request for Adoption of Technical Specifications Task Force (TSTF) Traveler TSTF-500, Revision 2, DC Electrical Rewrite - Update to TSTF-360

Units 1 and 2 License Amendment Request for Adoption of Technical Specifications Task Force (TSTF) Traveler TSTF-500, Revision 2, DC Electrical Rewrite - Update to TSTF-360

ML15226A276
Person / Time
Site:	Hatch
Issue date:	08/11/2015
From:	Pierce C Southern Nuclear Operating Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
NL-14-0649, TSTF-360 TSTF-500, Rev. 2
Download: ML15226A276 (188)

Text

{{#Wiki_filter:Charles R. Pierce Southern Nuclear Regulatory Affairs Director Operating Company, Inc. 40 Inverness Center Parkway Post Office Box 1295 Birmingham, AL 35242 Tel 205.992.7872 SOUTHERN Fax 205.992.7601 NUCLEAR A SOUTHE:RN COMPANY .A U. 1 29;5 Docket Nos.: 50-321 NL-1 4-0649 50-366 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D. C. 20555-0001 Edwin I. Hatch Nuclear Plant - Units 1 and 2 License Amendment Request for Adoption of Technical Specifications Task Force (TSTF) Traveler TSTF-500, Revision 2, "DC Electrical Rewrite - Update To TSTF-360". In accordance with the provisions of Title 10 of the Code of Federal Regulations (10 CFR) Section 50.90, Southern Nuclear Operating Company (SNC) is submitting a request for an amendment to Edwin I. Hatch Nuclear Plant, Units 1 and 2 (HNP) Technical Specifications (TSs) to incorporate the NRC-approved TSTF-500, Revision 2, "DC Electrical Rewrite - Update to TSTF-360." provides a description and assessment of the proposed changes including the requested confirmation of applicability and plant-specific verifications, technical analyses, regulatory analyses, and environmental considerations. Attachment 2 provides a summary of the required Final Safety Analysis Report (FSAR) descriptions. Attachment 3 provides markup pages of existing TSs and TS Bases to show the proposed change. Attachment 4 provides revised (clean) TS pages. SNO requests that, once approval is granted, the amendment be implemented within 90 days. In accordance with 10 CFR 50.91(b)(1), a copy of this application and the reasoned analysis about no significant hazards consideration is being provided to the designated Georgia official. If you have any questions, please contact Ken McElroy at (205) 992-7369.

U.S. Nuclear Regulatory Commission NL-1 4-0649 Page 2 Mr. C.R. Pierce states he is Regulatory Affairs Director of Southern Nuclear Operating Company and is authorized to execute this oath on behalf of Southern Nuclear Operating Company and to the best of his knowledge and belief, the facts set forth in this letter are true... Respectfully sulqi itted, C. R. Pierce Regulatory Affairs Director wor otto and subscribed before me this _4__-day of , 2015. My commission expires: 6 /e~ CRP/OCV Attachments:

1. Description and Assessment of the Proposed Changes

2. List of Required Final Safety Analysis Report (ESAR)

Descriptions

3. Markup Pages of Existing TSs and TS Bases

4. Clean TS Pages

Enclosures:

1. Letter From Battery Vendor, C&D Technologies, Verifying.

the Acceptability of Using Float Current Monitoring

2. Evaluation Supporting a Completion Time Longer than 2 Hours for Specification 3.8.4, Required Action 3.8.4.E cc:

Southern Nuclear Operatingq Company Mr. S. E. Kuczynski, Chairman, President & CEO Mr. D. G. Bost, Executive Vice President & Chief Nuclear Officer Mr. D. R. Vineyard, Vice President - Hatch Mr. M.D. Meier, Vice President - Regulatory Affairs Mr. D. R. Madison, Vice President - Fleet Operations Mr. B. J. Adams, Vice President - Engineering Mr. G.L.Johnson, Regulatory Affairs Manager - Hatch RTYPE: CHA02.004 U. S. Nuclear Requlatory Commission Mr. V. M. McCree, Regional Administrator Mr. R. E. Martin, NRR Senior Project Manager - Hatch Mr. D.H. Hardage, Senior Resident Inspector - Hatch State of Georgqia Mr. J. H. Turner, Environmental Director Protection Division

Edwin I. Hatch Nuclear Plant - Units 1 and 2 License Amendment Request for Adoption of Technical Specifications Task Force (TSTF) Traveler TSTF-500, Revision 2, "DC Electrical Rewrite - Update To TSTF-360". Description and Assessment of the Proposed Changes to NL-14-0649 Description and Assessment of Proposed Change

1.0 DESCRIPTION

The Technical Specification (TS) requirements are revised from requirements on battery-cells to requirements on the battery. This focuses the requirements on the assumed safety function of the battery. The proposed amendment would revise TS requirements related to direct current (DC) electrical systems in TS limiting condition for operation (LCO) 3.8.4, "DC Sources - Operating," LCO 3.8.5, "DC Sources - Shutdown," and LCO 3.8.6, "Battery Cell Parameters." A new "Battery Monitoring and Maintenance Program" is being proposed for Section 5.5 "Administrative Controls - Programs and Manuals." Specifically, the proposed changes request new actions for an inoperable battery charger and alternate battery charger testing criteria for LCO 3.8.4, "DC Sources - Operating," and [CO 3.8.5, "DC Sources - Shutdown." The proposed changes also include the relocation of a number of Surveillance Requirements (SRs) in TS 3.8.4 that perform preventive maintenance on the safety-related batteries to a licensee-controlled program. It is proposed that LCO 3.8.6, "Battery Cell Parameters," be modified by relocating Table 3.8.6-1, "Battery Cell Parameter Requirements," to a licensee-controlled program, and that specific actions with associated Completion Times (CTs) for out-of-limits conditions for battery cell voltage, electrolyte level, and electrolyte temperature be added to TS 3.8.6. In addition, specific SRs are being proposed for verification of these parameters. A new program is being proposed for Section 5.5 of the Administrative Controls for the maintenance and monitoring of station batteries. The items proposed to be relocated will be contained within this program, titled the "Battery Monitoring and Maintenance Program." The proposed changes provide new Actions for an inoperable battery charger and alternate battery charger testing criteria. The longer CT for an inoperable battery charger will allow additional time for maintenance and testing. In addition, a number of SRs are relocated to licensee control including the monitoring of battery cell parameter requirements and performance of battery maintenance activities. These changes are consistent with the U.S. Nuclear Regulatory Commission (NRC)- approved Technical Specifications Task Force (TSTF) Traveler TSTF-500, Revision 2. The availability of this TS improvement was announced in the Federal Register on September 1, 2011 (76 FR 54510).

2.0 ASSESSMENT

2.1 APPLICABILITY OF TSTF-500 AND MODEL SAFETY EVALUATION (SE) Southern Nuclear Operating Company (SNC) has reviewed the model SE referenced in the Federal Register Notice of Availability published on September 1, 2011 (76 FR 54510). The review included the NRC staff's SE, as well as the supporting information provided in TSTF-500, Revision 2. As described herein, SNC has concluded that the technical bases for the proposed changes presented in TSTF-500, Revision 2, and the model SE prepared by the NRC staff are applicable to Edwin I. Hatch Nuclear Plant, Units 1 and 2 (HNP) and support incorporation of this amendment into the HNP TS. Al-1 to NL-14-0649 Description and Assessment of Proposed Change The HNP Station Service DC system is very similar to the system described in TSTF-500, with respect to its ability to meet the duty cycle assumed in the accident analyses and with its operations in the float and equalize modes. However, HNP also has a DC system specifically intended to support the Safety Related Diesel Generators (DGs), which is not described in TSTF-500-A, Revision 2. (The DG DC system is listed in the LCO 3.8.4 statement of the TSTF-500 TS mark-up, but is not described in Section 4.1 of the TSTF Technical Analysis). Following is a brief description of both HNP systems. HNP Station Service DC System The 125/250 V DC Station Service system for each HNP unit is made up of two separate subsystems, consisting of DC switchgear R22-S01 6 (Subsystem I) and R22-S017 (Subsystem II). Each subsystem contains the following major components covered by TS Limiting Conditions for Operation (LCO) 3.8.4, 3.8.5, and 3.8.6: One 120 cell, 250 Volt (V), lead-acid type battery. Three 125 V, 400 amp battery chargers. The battery is essentially two 60 cell, 125 V batteries connected in series. They are center tapped such that they allow for the supply of both 125 V loads and 250 V loads. Two of the three chargers are normally in service, with one in standby. Two battery throwover switches per division are used to determine which two chargers are in service and which one is in standby. A subsystem of the station service DC System is considered Operable when the 125/250 VDC battery and two of-the three battery chargers are Operable. HNP Safety Related DG DC System The HNP DG DC system uniquely supports the Safety Related Emergency DGs. There are a total of five emergency diesel generators at HNP. Two are dedicated to Unit 1, two are dedicated to Unit 2, and one is a "swing" diesel capable of supplying either Unit 1 or 2. The DG DC system is made up of five subsystems, each supporting one Diesel Generator. Like the station service system, each DG subsystem is also covered by LCOs 3.8.4. 3.8.5, and 3.8.6, and contains the following major components: One 60 cell, 125 V lead-acid type battery. Two 125 V, 100 amp battery chargers. One charger is normally in service and one is in standby. Like the station service chargers, each pair of diesel battery chargers has a throwover switch to align power to the selected loads. The DC system for a DG is considered Operable when its battery and one of its A1-2 to NL-14-0649 Description and Assessment of Proposed Change two battery chargers are Operable. The HNP TS for DC Sources is similar to the Specification used in TSTF-500 as the starting point for the revisions. HNP never implemented TSTF-360, consequently, the attached HNP specific mark-up follows the mark-up provided in Attachment B] of TSTF-500 as closely as possible. The primary difference between the HNP TS and the NUREG-1 433 TS marked-up for TSTF-500 is HNP's separation of the Station Service and DG DC systems in the LCO Conditions, and the default Conditions if the DG DC systems' CTs are not met. The 12 hour CT for one DG DC electrical power subsystem inoperable (current TS 3.8.4 Condition B) is consistent with the CT for one required offsite circuit inoperable concurrent with one required DG inoperable (HNP TS 3.8.1 Condition E). Similarly, the default Condition's RAs for the CT of current TS 3.8.4 Condition B not being met are the same as the default Condition's RAs for the CT of TS 3.8.1 Condition E not being met (MODE 3 in 12 hours, MODE 4 in 36 hours). The default Condition for the NUREG-1433 TS marked-up for TSTF-500 require the associated DG to be declared inoperable if the CT for the one DG DC electrical power subsystem is not met. The HNP TS is therefore conservative and more limiting than the TSTF-500 for the case of an inoperable DG battery. Again, the TSTF would require declaring the associated diesel generator inoperable at the end of the 2 hour CT, which would provide at least another 72 hours of operation. On the other hand, at the end of the 12 hour DG DC system CT for HNP, an immediate shutdown would be required with Mode 3 required in 12 hours or less. These differences do not affect the applicability of the model SE for HNP. The HNP Station Service batteries and the HNP DG batteries also have different required float currents for determining that their respective batteries are charged. This requires different Conditions for the Station Service battery chargers inoperable and the DG battery chargers inoperable, since different values of battery float current are required to be verified. This affects the HNP markups for TS 3.8.4, 3.8.5, and 3.8.6 (and the associated TS B]ases). Having separate required float currents for the station service and DG batteries does not affect the applicability of the published model SE. Also, the HNP LCO Condition for TS 3.8.4 discusses the opposite unit's DC systems that are needed to support safety systems common to both units; accordingly, there are corresponding Conditions for the opposite unit's DC DG electrical power subsystem. This Condition is unaffected by the proposed changes in TSTF-500, except to modify the required SRs appropriately based on re-numbering. This does not impact the applicability of the published model SE. The HNP Actions for LCO 3.8.4 list a Condition for two or more DC electrical power subsystems inoperable that result in a loss of function, with a required immediate entry into LCO 3.0.3. This Condition is not explicitly stated in the TSTF-500 Actions for LCO 3.8.4; however, immediate entry into LCO 3.0.3 would be nonetheless required based on the LCO 3.0.3 Applicability. This does not impact the applicability of the published model SE. The surveillance requirements (SR) in the HNP specification are similar to those in TSTF-500, but the HNP SRs also include requirements for the opposite unit's DC sources if they are required per the LCO. Current HNP SR 3.8.4.6 does not contain the Note stating that the surveillance shall not be performed in Modes 1, 2, or 3. This note is A1-3 ito NL-14-0649 Description and Assessment of Proposed Change eliminated from the TS in TSTF-500; but since it does not exist in the current HNP TS, this change was not necessary. Also, current HNP SR 3.8.4.7 does not include the 60 month provision for the modified performance test, which TSTF-500 removes, consequently, this spec will not be modified, other than to be re-numbered. Otherwise, the changes to this SR are the same as the TSTF changes. HNP has implemented the Surveillance Frequency Control Program (SFCP) per the provisions of TSTF-425, and as approved by the NRC for Plant Hatch via Amendments No. 266 and 210 for the Hatch Unit 1 and Unit 2 Technical Specifications, respectively. Consequently, the surveillance frequencies in this submittal are listed as "... in accordance with the Surveillance Frequency Control Program", or words to that effect. In the current HNP TS, the surveillances which verify battery terminal voltage, charger function, battery capacity, electrolyte level and temperature, specific gravity (which, per procedure, includes a measurement of float current) and cell float voltage have frequencies controlled by the SFCP. Any revised frequencies are evaluated by NEI 04-10, "Risk Informed Method for Control of Surveillance Frequencies", Revision 1, as required by the Program. Finally, the Model Safety evaluation states that the battery rooms are "environmentally controlled". The HNP battery rooms are environmentally controlled in the following sense:

1) The station service and diesel generator battery rooms have specific ventilation systems (exhaust fans) primarily designed to vent any hydrogen released in the room from the charging process,

2) The station service battery rooms are in the Control Building and are thus serviced by the Control Building Ventilation system. Similarly, the diesel battery rooms are located inside the diesel generator building which is serviced by the diesel generator ventilation system.

2.2 VERIFICATION AND REQUIRED FINAL SAFETY ANALYSIS REPORT CHANGES As described in Section 4.7.1, "Verifications," in TSTF-500, SNC provides the following verifications.

1. Enclosure 1 contains a letter from the manufacturers of the batteries used at HNP verifying the acceptability of using float current monitoring instead of specific gravity monitoring as a reliable and accurate indication of the state-of-charge of the battery and that this will hold true over the life of the battery.

2. SNC verifies that the equipment that will be used to monitor float current under SR 3.8.6.1 will have the necessary accuracy and capability to measure electrical currents in the expected range. Additionally, SNC verifies that the minimum required procedural time to measure battery float current will be 30 seconds or as recommended by the float current measurement instrument manufacturer. This minimum float current measurement time is required to provide a more accurate battery float current reading.

A1-4

Attachment i to NL-14-0649 DeScription and Assessment of Proposed Change

3. SNC verifies that battery room temperature is routinely monitored such that a room temperature excursion could reasonably expect to be detected and corrected prior to the average battery electrolyte temperature dropping below the minimum electrolyte temperature.

4. Enclosure 2 contains the justification for an inoperable station service battery CT greater than 2 hours for TS 3.8.4, Required Action El1 in accordance with the guidance in RG 1.177 and RG 1.174.

5. The cell resistance limits in existing SR 3.8.4.5 are relocated to the Battery Monitoring and Maintenance Program. The connection resistance limits are currently provided in Technical Requirements Manual Table T9.1-1 (One TRM for each unit). The resistance limits apply to the overall connection resistance and allow for an increase in connection resistance due to changes in connection tightness and contact surface corrosion. The OPERABILITY resistance limit is calculated for a battery that has reached end of life (80 % of capacity).

6. Monitoring of battery parameters (i.e., specific gravity, electrolyte level, cell temperature, float voltage, connection resistance, and physical condition) will be relocated to the licensee-controlled program, required and described in TS Section 5.5, "Programs and Manuals," and titled the "Battery Monitoring and Maintenance Program."

7. SNC verifies that plant procedures will require verification of the selection of the pilot cell or cells when performing SR 3.8.6.5.

As described in Attachment 2. "List of Required Final Safety Analysis Report (FSAR) Descriptions." SNC will revise the FSAR to include the following, as part of the adoption of TSTF-500. Revision 2:

1. How a 5 percent design margin for the batteries corresponds to a 20 amp float current value for the station service batteries and a 5 amp float current value for the DG batteries, indicating that the battery is 95 percent charged.

2. How long term battery performance is obtained by maintaining a float voltage greater than or equal to the minimum established design limits provided by the battery manufacturer.

3. How the batteries are sized with correction margins that include temperature and aging and how these margins are maintained.

4. The minimum established design limit for battery terminal float voltage.

5. The minimum established design limit for electrolyte level.

6. The minimum established design limit for electrolyte temperature.

7. How each battery is designed with additional capacity above that required by the design duty cycles to allow for temperature variations and other factors.

Al-5 to NL-14-0649 Description and Assessment of ProPOsed Change

8. Normal DC system operation i.e., powered from the battery chargers with the batteries floating on the system, and with a loss of normal power to the battery charger.

2.3 OPTIONAL CHANGES AND VARIATIONS SNC is proposing the following variations from the TS changes described in the TSTF-500, Revision 2, or the applicable parts of the NRC staff's model SE referenced in the Federal Register on September 1, 2011 (76 FR 54510). Unless otherwise noted, these options were recognized as acceptable variations in TSTF-500 and the NRC staff's model SE. SNC is proposing a CT longer than 2 hours for proposed Specification 3.8.4, Required Action E.I. A risk evaluation supporting the longer CT is included as Enclosure 2. This evaluation is in accordance with the guidance provided in RG 1.177 and RG 1.174. SNC is proposing to adopt TSTF-500 Specification 3.8.4, Condition B, as HNP Specification 3.8.4, Condition E. Proposed HNP Condition E is included because proposed Required Action E.1 (station service battery inoperable) and proposed Required Action F.1 (station service DC electrical power subsystem inoperable) should have different CTs. Proposed Condition E is one inoperable station service battery on one subsystem. The RG 1.177 analysis attached to this submittal justifies a 12 hour Completion Time for the battery in large part because the battery charger is still available to supply the DC bus during normal and emergency conditions. Condition F is the complete loss of one station service DC subsystem such that the ability to respond to an event is lost. Essentially, proposed Condition D represents the loss of a battery charger, proposed Condition E represents the loss of a battery, and proposed Condition F represents the loss of a battery charger and battery. Proposed Condition F is clearly a more serious condition, warranting the shorter (2 hour) Completion Time. No changes are being proposed to the DG battery inoperable Condition other than its number designation (in the current TS it is Condition B) and splitting the battery and battery chargers into two separate LCO Conditions. SNC is proposing a variation with respect to pilot cell selection. Per the IEEE Std. 450-2002, the HNP station service and diesel generator batteries do not exhibit a temperature deviation across the battery of greater than 5 degrees Fahrenheit. Consequently, HNP will not take temperature into account when selecting the battery pilot cells. SNC also proposes to add a statement to the SR 3.8.6.6 Bases that there are three different types of battery modified performance discharge tests suitable for satisfying the requirements of SR 3.8.6.6. These three type tests are identified and described as acceptable methods by IEEE-450-2002. The suggested wording for the SR Bases is included in Attachment 3 to this letter. This variation was not provided for in TSTF-500. A1-6 to NL-14-0649 Description and Assessment of Proposed Change

3.0 REGULATORY ANALYSIS

3.1 NO SIGNIFICANT HAZARDS CONSIDERATION DETERMINATION SNC has evaluated the proposed changes to the TS using the criteria in Section 50.92 to Title 10 of the Code of Federal Regulations (10 CFR) and has determined that the proposed changes do not involve a significant hazards consideration. Description of Amendment Request: The proposed amendment would revise TS requirements related to direct current (DC) electrical systems in TS Limiting Condition for Operation (LCO) 3.8.4, "DC Sources - Operating," LCO 3.8.5, "DC Sources - Shutdown," and LCO 3.8.6, "Battery Cell Parameters." A new "Battery Monitoring and Maintenance Program" is being proposed for Section 5.5 "Administrative Controls - Programs and Manuals." Basis for proposed no significant hazards consideration determination: As required by 10 CFR 50.91 (a), the SNC analysis of the issue of no significant hazards consideration is presented below:

1. Does the proposed change involve a significant increase in the probability or consequences of any accident previously evaluated?

Response: No. The proposed changes restructure the Technical Specifications (TS) for the direct current (DC) electrical power system and are consistent with TSTF-500, Revision 2. The proposed changes modify TS Actions relating to battery and battery charger inoperability. The DC electrical power system, including associated battery chargers, is not an initiator of any accident sequence analyzed in the Final Safety Analysis Report (FSAR). Rather, the DC electrical power system supports equipment used to mitigate accidents. The proposed changes to restructure TS and change surveillances for batteries and chargers to incorporate the updates included in TSTF-500, Revision 2, will maintain the same level of equipment performance required for mitigating accidents assumed in the FSAR. Operation in accordance with the proposed TS would ensure that the DC electrical power system is capable of performing its specified safety function as described in the FSAR. Therefore, the mitigating functions supported by the DC electrical power system will continue to provide the protection assumed by the analysis. The relocation of preventive maintenance surveillances, and certain operating limits and actions, to a licensee-controlled Battery Monitoring and Maintenance Program will not challenge the ability of the DC electrical power system to perform its design function. Appropriate monitoring and maintenance that are consistent with industry standards will continue to be performed. In addition, the DC electrical power system is within the scope of 10 CFR 50.65, "Requirements for monitoring the effectiveness of maintenance at nuclear power plants," which will ensure the control of maintenance activities associated with the DC electrical power system.

• The integrity of fission product barriers, plant configuration, and operating procedures A1-7

Attachment i to NL-14-0649 Description and Assessment of Proposed Change as described in the FSAR will not be affected by the proposed changes. Therefore, the consequences of previously analyzed accidents will not increase by implementing these changes. Therefore, the proposed changes do not involve a significant increase in the probability or consequences of an accident previously evaluated.

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

Response: No The proposed changes involve restructuring the TS for the DC electrical power system. The DC electrical power system, including associated battery chargers, is not an initiator to any accident sequence analyzed in the ESAR. Rather, the DC electrical power system supports equipment used to mitigate accidents. The proposed changes to restructure the TS and change surveillances for batteries and chargers to incorporate the updates included in TSTF-500, Revision 2, will maintain the same level of equipment performance required for mitigating accidents assumed in the FSAR. Administrative and mechanical controls are in place to ensure the design and operation of the DC systems continues to meet the plant design basis described in the FSAR. Therefore, operation of the facility in accordance with this proposed change will not create the possibility of a new or different kind of accident from any accident previously evaluated.

3. Does the proposed change involve a significant reduction in the margin of safety?

Response: No. The margin of safety is established through equipment design, operating parameters, and the setpoints at which automatic actions are initiated. The equipment margins will be maintained in accordance with the plant-specific design bases as a result of the proposed changes. The proposed changes will not adversely affect operation of plant equipment. These changes will not result in a change to the setpoints at which protective actions are initiated. Sufficient DC capacity to support operation of mitigation equipment is ensured. The changes associated with the new Battery Monitoring and Maintenance Program will ensure that the station batteries are maintained in a highly reliable manner. The equipment fed by the DC electrical sources Will continue to provide adequate power to safety-related loads in accordance with analysis assumptions. TS changes made in accordance with TSTF-500, Revision 2, maintain the same level of equipment performance stated in the FSAR and the current TSs. Therefore, the proposed changes do not involve a significant reduction of safety. 3.2 APPLICABLE REGULATORY REQUIREMENTS/CRITERIA Southern Nuclear Operating Company has reviewed the NRC staff's model safety evaluation referenced in the Notice of Availability and concluded that the Regulatory Evaluation section is applicable to HNP, with the following qualifiers: A1-8 to NL-1 4-0649 Description and Assessment of Proposed Change Reg Guide 1.75 - The construction permit for HNP-2 was issued in December 1972. The implementation date given in Section D of Reg Guide 1.75 is February 1974. For this reason, the recommendations of Reg Guide 1.75 are not required to be met on HNP-2. However, physical independence of the DC systems is maintained and discussed in the HNP -2 FSAR, Section 8.3.1.4. Reg Guide 1.129 - The Battery Monitoring and Maintenance Program, proposed for Section 5 of the TS, indicates the adherence to Reg Guide 1.129 and IEEE (std) 450-2002, "IEEE Recommended Practice for Maintenance, Testing, and Replacement of Vented Lead -Acid Batteries for Stationary Application", with exceptions noted. This is consistent with TSTF-500. The Traveler and model safety evaluation discuss the 10 CFR 50, Appendix A, General Design Criteria (GDC). HNP-2 is committed to these GDC. HNP-1, however, was not licensed to the 10 CFR 50, Appendix A GDC. The HNP-1 construction permit was received under the 70 general design criteria, as discussed in Section F.3 of the UFSAR. (Appendix F has since been designated as historical). However, the HNP Unit 1 Design Bases has been reviewed against the 10 CFR 50, Appendix A, GDC based on an understanding of its intent. Those evaluations are presented in Appendix F of the Unit 1 FSAR and a portion of them are presented below for those GDC quoted in the model Safety evaluation. 10 CFR Appendix A. Criteriorn 1. "Quality Standards". Design Evaluation Those system and components of reactor facilities which are essential to the prevention of accidents which could affect the public health and safety or to mitigation of their consequences shall be identified and then designed, fabricated, and erected to quality standards that reflect the importance of the safety function to be performed. Where generally recognized codes or standards on design, materials, fabrication, and inspection are used, they shall be identified. Where adherence to such codes or standards does not suffice to assure a quality product in keeping with the safety function, they shall be supplemented or modeled as necessary. Quality assurance programs, test procedures, and inspection acceptance levels to be used shall be identified. A showing of sufficiency and applicability of codes, standards, quality assurance programs, test procedures, and inspection acceptance levels used is required. The Southern Nuclear Operating Company (SNC) HNP Quality Assurance (QA) Program is discussed in Appendix D of the Unit 1 FSAR and in Chapter 17 Of the Unit 2 FSAR, which are not designated as historical sections. The QA program for HNP is designed to assure the plant's safe and reliable operation and to satisfy the quality assurance requirements of Appendix B to 10 CFR Part 50. The items covered under the QA program are the safety related structures, systems and components. A more detailed description of the QA program is found in the Quality Assurance Topical Report (QATR) for the SNO Fleet.' A1-9 to NL-14-0649 Description and Assessment of Proposed Change 10 CFR Appendix A. Criterion 17, "Electric Power Systems". Design Evaluation Both onsite and offsite electric power systems are capable of providing a reliable source of power to permit functioning of structures, systems, and components important to safety. Both of these sources have the capability to furnish required power for all postulated AOO and accident conditions. In the event that all offsite circuits are lost, the emergency buses will be connected to the onsite emergency diesel generators. Physically independent circuits are provided from the HNP-1 switchyard to the startup auxiliary transformers. These circuits are fed by at least two independent transmission lines, physically separated as they approach the switchyard so that the failure of one line will not cause failure of the other. From the switchyard to the onsite electrical distribution system, separation is also provided so that failure of one circuit will not cause failure of the other. The Unit 1 features that indicate conformance to Criterion 1 are described in Section 8.3 of the Unit 1 ESAR. This FSAR section discusses the safety basis of the safety related electrical systems including system operation, separation between systems, and single failure criteria. The features of the safety related DC system are discussed in Unit 1 FSAR section 8.5. Neither section 8.3 nor 8.5 are designated as historical. 10 CFR Appendix A. Criterion 18, "Inspection and Testing of Electric Power Systems". Design Evaluation The primary circuit breakers are inspected, maintained, and tested on a routine basis. This can be accomplished without removing the generators, transformers, and transmission lines from service. Transmission line protective relaying is tested on a routine basis. This can be accomplished without removing the transmission line from service. Generator, unit auxiliary transformer, and startup auxiliary relaying are tested during refueling. Automatic transfers of 4160-V buses 1 E, 1 F, and 1 G from startup transformers to emergency standby diesel generators are tested during the refueling of the unit to prove the operability of the system. The DC system is equipped with detectors to indicate when there is a ground existing in any portion of the system. A ground on one portion of the DC system will not cause any equipment to malfunction. The batteries are under continuous automatic charging and are inspected and checked on a routine basis while the unit is in service. Additionally, inspection and testing is discussed in general for the Unit 1 safety related electrical systems in Section 8.3.7 of the Unit 1 ESAR and specifically for the safety related DC systems in Section 8.5.5. Again, neither of these sections are historical. Additionally, and with respect to the DC systems, inspection and testing is carried out via the various TS surveillance requirements of LCOs 3.8.4, 3.8.5, and 3.8.6. This will continue to be true following implementation of TSTF-500, again by the various TS surveillance requirements, but also by the new "Battery Monitoring and Maintenance Program" referenced from Section 5.0 in the TS. Al1-10

Attachment i to NL-14-0649 Description and Assessment of Proposed Change 4.0 ENVIRONMENTAl. CONSIDERATION The proposed TS revision would change a requirement with respect to installation or use of a facility component located within the restricted area, as defined in 10 CFR Part 20, or would change an inspection or surveillance requirement. However, the proposed change does not involve (i) a significant hazards consideration, (ii) a significant change in the types or significant increase in the amounts of any effluent-that may be released offsite, or (iii) a significant increase in individual or cumulative occupational radiation exposure. Accordingly, the proposed TS change meets the eligibility criterion for categorical exclusion set forth in 10 CFR 51.22(c)(9). Therefore, pursuant to 10 CFR 51.22(b), no environmental impact statement or environmental assessment need be prepared in connection with the proposed TS change.

5.0 REFERENCES

Unit 1 ESAR Section 8.5 Unit 2 FSAR Section 8.3.2 SNC Calculations: MC-H-14-0009, "Station Service lA - Sizing and Voltage Profile" MC-H-1 4-0010, "Station Service 1 B - Sizing and Voltage Profile" MC-H-14-0013, "Station Service Battery 2B - Sizing" MC-H-14-0014, "Emergency Diesel Batteries lA, 1iB, & iC Sizing" MC-H-14-0015, Emergency Diesel Batteries 2A & 2C Sizing" MC-H-i14-001 6, "Station Service Battery 2A - Sizing" PRA-BC-H-1 2-001, "Risk Evaluation for Extending Current LCO of 2 Hours to 12 Hours for Inoperable Station Service Batteries". Al-li

Edwin I. Hatch Nuciear Plant - Units 1 and 2 License Amendment Request for Adoption of Technical Specifications Task Fdrce (TSTF) Traveler TSTF-500, Revision 2, "DC Electrical Rewrit~e - Update To TSTF-360," Using the Consolidated Line Item ~Improvement Process ~Attachment 2 List of Required Final Safety Analysis Report (ESAR) Descriptions

ATTACHMENT 2 LIST OF REQUIRED FINAL SAFETY ANALYSIS REPORT (FSAR) DESCRIPTIONS The following table identifies FSAR descriptions required by SNC as part of the adoption of TSTF-500, Revision 2. REQUIRED FSAR DESCRIPTIONS SNC will change or verify that the FSAR: DUE DATE!/ EVENT

1. Describes how a 5 percent design margin for the batteries Upon implementation of corresponds to a 20 amp and 5 amp float current value, for the the approved Technical station service and diesel generator batteries, respectively, Specification indicating the batteries are 95 percent charged.

amendment (applies to all)

2. States that long term battery performance is supported by maintaining a float voltage greater than or equal to the minimum established design limits provided by the battery manufacturer, which corresponds to 2.20 V per connected cell and that there are 60 connected cells in the battery, which corresponds to 132 V at the batterY terminals.

3. Describes how the batteries are sized with correction margins that include temperature and aging and how these margins are maintained.

4. States the minimum established design limit for battery terminal float voltage.

5. States the minimum established design limit for electrolyte level.

6. States the minimum established design limit for electrolyte temperature.

7. Describes how each battery is designed with additional capacity above that required by the design duty cycles to allow for temperature variations and other factors.

8. Des'cribes normal DC system operation (i.e., powered from the battery chargers) with the batteries floating on the system, and a loss of normal power to the battery charger describing how the DC load is automatically powered from the station batteries.

Edwin I. Hatch Nuclear Plant - Units 1 and 2 License Amendment Request for Adoption of Technical Specifications Task Force (TSTF) Traveler TSTF-500, Revision 2, "DC Electrical Rewrite - Update To TSTF-360". Markup Pages of Existing TSs and TS Bases

DC Sources - Operating 3.8.4 3.8 ELECTRICAL POWER SYSTEMS 3.8.4 DC Sources - Operating LCO 3.8.4 The following DC electrical power subsystems shall be OPERABLE:

a.

The Unit 1 Division 1 and Division 2 station service DC electrical power subsystems;

b.

The Unit 1 and the swing DGs DC electrical power subsystems; and

c.

The Unit 2 DG DC electrical power subsystems needed to support the equipment required to be OPERABLE by LCO 3.6.4.3, "Standby Gas Treatment (SGT) System," and LCO 3.8.1, "AC Sources - Operating." APPLICABILITY: MODES 1, 2, and 3. ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A. Swing DG DC electrical A.1 Restore DG DC 7 days power subsystem electrical power inoperable due to subsystem to performance of SR 3.8.4.7 OPERABLE status. 3 or SR 3.8.4b.6.6. OR One or more required Unit 2 DG DC electrical power subsystems inoperable. (continued) HATCH UNIT 1 3.8-26 HATH UIT 3.-26Amendment No. 2-2-7

DC Sources - Operating 3.8.4 ACTIONS (continued) CONDITION REQUIRED ACTION COMPLETION TIME B. Required Unit 1 DG DC B.1 Restore battery terminal 2 hours b~attery charger on one voltage to areater than subsystem inoperable or eaual to the minimum established OR float voltage R~equired swing DG DC AND b.attery charger inoperable f__or reasons other than B.2 Verify battery float Once per 12 hours Condition A. current is < 5 amos AND B.3 Restore battery 72 hours charoer(s) to OPERABLE status BC. One Unit 1 DG DC electrical power subsystem inoperable for reasons other than Condition B. BC.1 Restore DG DC electrical power subsystem to OPERABLE status. 12 hours ORS Swing DG DC electrical power subsystem inoperable for reasons other than Condition A or B. 3.8-27 HATC UNI 1 38-27Amendment No. 2-2-7

DC Sources - Operating 3.8.4 1U. One or more required Unit 1 station service DC battery chargers on one subsystem inoperable D.1 Restore battery terminal votaet reater than or eaual to the minimum established float voltaoe AND D.2 Verify battery float current is < 20 amos AND D.3 Restore battery charger(s) to OPERABLE status 2 hours Once per 12 hours. 72 hours _E. One Unit 1 station service E.1 Restore required 12 hours DC battery on one battery to OPERABLE subsystem inoperable status HATCH UNIT 1 3.8-28 HAT H UIT 3.-28Amendment No. 2 I

DC Sources - Operating 3.8.4 GF. One Unit 1 station service GF.1 Restore station service 2 hours DC electrical power DC electrical power subsystem inoperable for subsystem to reasons other than OPERABLE status. Condition D or E. PG. Required Action and PG.1 Be in MODE 3. 12 hours Associated Completion Time of Condition A, B, AND e* C. D, E. or F not met. PG.2 Be in MODE 4. 36 hours E=H. Two or more DC electrical E-H.1 Enter LCO 3.0.3. Immediately power subsystems inoperable that result in a loss of function. HATCH UNIT 1 3.8-29 HATC UNI 1 38-29Amendment No. 22-7

DC Sources - Operating 3.8.4 SURVEILLANCE REQUIREMENTS NOTE--------------------------------.. SR 3.8.4.1 through SR 3.8.4.8-3lare applicable only to the Unit 1 DC sources. SR 3.8.4.8-4_is applicable only to the Unit 2 DC sources. SURVEILLANCE FREQUENCY SR 3.8.4.1 Verify battery terminal voltage is >- 125 V on float In accordance with Ghagereater than or equal to the minimum the Surveillance established float voltage. Frequency Control Program SR 3.8.1.2o Vorify no. visiblc corrosion at battery ter*minals a.nd !n accordance,with °""......

• "*'Fro........

Control SR "*

• ,t *Verify

batry,

.{,, conncction rosistanco is within I... 4'".. {* dete~iati~n Fro (cncontroled HATCH UNIT 1 3.8-30 HATC UNI 1 38-30Amendment No. 2-66 I

DC Sources - Operating 3.8.4 SURVEILLANCE REQUIREMENTS (continued) SURVEILLANCE FREQUENCY + SR 3.8.4.62 Verify each required battery charger supplies > 400 amps for station service subsystems, and >- 100 amps for DG subsystems at Ž4 29-V rete than or equal to the minimum established float vtaefor > 1 hour. OR Verify each battery charaer can recharge the battery to the fully charged state within 24 hours while supplying the largest combined demands of the various continuous steady state loads, after a battery discharge to the bounding design basis event discharge state. In accordance with the Surveillance Frequency Control Program -t SR 3.8.4.73_ -~~~NOTES--------

1.

The modified performance discharge test in SR 3.8.4:86.6 may be performed in lieu of thc set;icc tcst in SR 3.8.4.73.

2.

This Surveillance shall not be performed in MODE 1, 2, or 3, except for the swing DG battery. However, credit may be taken for unplanned events that satisfy this SR. Verify battery capacity is adequate to supply, and maintain in OPERABLE status, the required emergency loads for the design duty cycle when subjected to a battery service test. In accordance with the Surveillance Frequency Control Program (continued) HATCH UNIT 1 3.8-31 HATC UNI 1 38-31Amendment No. 266 I

DC Sources - Operating 3.8.4 SURVE_.._I LLANE'EQIREENSIconinedSURVEILLANCE FREQUENCY N Irf%"r" -- ti I

• *;ll,*
• k*ll
• ^
• ^,*^,4 MODE 1,, or 3,-- except for the,..wng....lo; pernn fer-mab.nce discharge testr, orn modi*'f*.ied.

unomin ichri tA In accordance wi-th the monhs'clhanc Frequency Control

• 124 months w."hen expected life-'w":th capacit 100%

of

• .*tl SR 3.8.4.84_

For required Unit 2 DC sources, the SRs of Unit 2 In accordance with Specification 3.8.4 are applicable, applicable SRs HATCH UNIT 1 3.8-32 HATC UNI 1 38-32Amendment No. 2-66 I

DC Sources - Operating 3.8.4 3.8 ELECTRICAL POWER SYSTEMS 3.8.4 DC Sources - Operating LCO 3.8.4 The following DC electrical power subsystems shalt be OPERABLE:

a.

The Unit 2 Division 1 and Division 2 station service DC electrical power subsystems;.

b.

The Unit 2 and the swing DGs DC electrical power subsystems; and

c.

The Unit 1 DG DC electrical power subsystems needed to support the equipment required to be OPERABLE by LCO 3.6.4.3, "Standby Gas Treatment (SGT) System"; LCO 3.7.4, "Main Control Room Environmental Control (MCREC) System"; LCO 3.7.5, "Control Room Air Conditioning (AC) System"; and LCO 3.8.1, "AC Sources - Operating." APPLICABILITY: MODES 1, 2, and 3. ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A. Swing DG DC electrical A.1 Restore DG DC 7 days power subsystem electrical power inoperable due to subsystem to performance of SR 3.8.4.:7 OPERABLE status. 3or SR 3.8.48~.6. O._R One or more required Unit 1 DG DC electrical power subsystems inoperable. (continued) HATCH UNIT 2 3.8-26 HATC UNI 2 38-26Amendment No.-1-68I

DC Sources - Operating 3.8.4 ACTIQNS (continued) CONDITION REQUIRED ACTION COMPLETION TIME B. Required Unit 2 DG DC B,1 Restore battery, terminal2hor battery, charger on one voltage to greater than subsystem inoperable or eaual to the minimum established Required swing DG DC AND battery charger inoperable for reasons other than B.2 Verify battern/float Once per 12 hours .Cndition A. current is < 5 amos AND B.3 Restore battery. 72 hours charger(s' to OPERABLE status 8=_. One Unit 2 DG DC electrical power subsystem inoperable for reasons other than Condition B. BC.1 Restore DG DC electrical power subsystem to OPERABLE status. 12 hours OR Swing DG DC electrical power subsystem inoperable for reasons other than Condition Aor B. HATCH UNIT 2 3.8-27 HATCH NIT 2 .8-27Amendment No..160

DC Sources - Operating 3.8.4 1"i D. One or more required Unit 2 station service DC batter, chargers on one subsystem inoperable Restore batterv terminal voltage to greater than minimum established float voltage AND D.2 Verify battery, float current is < 20 amps AND~ D.3 Restore battery. OPERABLE status 2 hours. Once ner 12 hours 72 hours E. One Unit 2 station service E.1 Restore required 12 hours DC battery on one battery to OPERABLE subsystem inoperable statuis HATCH UNIT 2 3.8-28 HATC UNI 2 38-28Amendment No. 41-69

DC Sources - Operating 3.8.4 GE_. One Unit 2 station service G=_F.1 Restore station service 2 hours DC electrical power DC electrical power subsystem inoperablekfr subsystem to reasons other than OPERABLE status. Condition D or E. DG Required Action and PG.1 Be in MODE 3. 12 hours Associated Completion Time of Condition A, B, AND e* C. D. E. or F not met. DG.2 Be in MODE 4. 36 hours £=H. Two or more DC electrical E__H.1 Enter LCO 3.0.3. Immediately power subsystems inoperable that result in a loss of function. HATCH UNIT 2 3.8-29 HATH UIT 3.-29Amendment No. 1-69

DC Sources - Operating 3.8.4 SURVEILLANCE REQUIREMENTS ...........................N O T E --- -... SR 3.8.4.1 through SR 3.8.4.8-lare applicable only to the Unit 2 DC sources. SR 3.8.4.8-4__is applicable only to the Unit 1 DC sources. SURVEILLANCE FREQUENCY SR 3.8.4.1 Verify battery terminal voltage is

• 125 V on float In accordance with ehar~§egreater than or equal to the minimum the Surveillance established float voltage.

Frequency Control Program Frc.....nc-Control Veif battr,'connctin reistnc s wthi ,isual Ind.,.ic,-ation... of phys.,r.,.,-ica.l damag or bn',ormal the" Su..... la... SR-3.8,1 Rom.....e visible corrosion and. ' verify battery' cell to' In accodanc with... cel n trIna*IVVl l concin i r.otewt the SurVelac a,'+ +'*;*'Frequency Control (continued) HATCH UNIT 2 3.8-30 HATC UNI 2 38-30Amendment No. 2--1-Q I

DC Sources - Operating 3.8.4 SURVEILLANCE REQUIREMENTS (continued) SU RVEI LLANCE FREQUENCY SR 3.8.4.62 Verify each required battery charger supplies > 400 amps for station service subsystems, and -> 100 amps for DG subsystems at Ž 129 Varae than or eaual to the minimum established float vote for > 1 hour. Verify each battery charger can recharge the battery to the fully charged state within 24 hours while supplying the largest combined demands of the various continuous steady state loads, after a battery, discharge to the bounding design basis event discharge state. In accordance with the Surveillance Frequency Control Program SR 3.8.4.73 -~~~NOTES--------

1.

The modified performance discharge test in SR 3.8.4.86.6 may be performed in lieu of thc sc,'-icc test in SR 3.8.4J.7-3_

2.

This Surveillance shall not be performed in MODE 1, 2, or 3, except for the swing DG battery. However, credit may be taken for unplanned events that satisfy this SR. Verify battery capacity is adequate to supply, and maintain in OPERABLE status, the required emergency loads for the design duty cycle when subjected to a battery service test. In accordance with the Surveillance Frequency Control Program (continued) HATCH UNIT 2 3.8-31 HATCH UNI 2 3.8-31Amendment No.2--

DC Sources - Operating 3.8.4 SURVEILLANCE REQUIREMENTS (continued) SU RVEI LLANCE FREQUENCY I ______________________________________________________________ QD 0 A 0 N IVT- " Q o~.u'ert fr.r +h,~ c~1A,~r,.r, ff2 H-, *,,,: ,-rl÷** kr,- +pb~,-1-, f,-r - ,,nl1nn,., ~.,.,c.r,+e. W~~+ c,,,+c 4,., +k~cs CD Vcrify battcr,' capacity is Ž 80% of thc manufacturcr's rating whcn subjected to a nnrfnrmr~nnr~ dfr~nhrirnr~ tc~"t nr ~ mnrlifir'rl F..................... in accordance with thc SuR'eillancc Frcgucncy Control P-re~a~ 12 months when katte~y-shows degradation or has reached 85% of expeeted-14e-w4h capacity 100% of manufacturer's 21 months when battep,~-has reached 85% of e~peeted-I4e-with capacity Ž 100% of manufacturer's ~atkig SR 3.8.4.§4_ For required Unit 1 DC sources, the SRs of Unit 1 In accordance with Specification 3.8.4 are applicable, applicable SRs HATCH UNIT 2 3.8-32 HATC UNI 2 38-32Amendment No. 2--1-O I

DC Sources - Shutdown 3.8.5 3.8 ELECTRICAL POWER SYSTEMS 3.8.5 DC Sources - Shutdown LCO 3.8.5 The following DC electrical power subsystems shall be OPERABLE:

a.

The Unit 1 DC electrical power subsystems needed to support the DC electrical power distribution subsystem(s) required by LCO 3.8.8, "Distribution Systems - Shutdown"; and

b.

The Unit 2 DG DC electrical power subsystems needed to support the equipment required to be OPERABLE by LCO 3.6.4.3, "Standby Gas Treatment (SGT) System"; and LCO 3.8.2, "AC Sources - Shutdown." MODES 4 and 5, During movement of irradiated fuel assemblies in the secondary containment. APPLICABILITY: ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A. One required battery A.1 Restore battery terminal 2 hours charger on one or more voltage to greater than required DG DC or equal to the minimum subsystems inoperable. established float voltage. AND .AND The redundant subsystem A.2 Verify battery float Once per 12 hours battery and required current < 5 amps. chargers OPERABLE. AND A.3 Restore battery 72 hours charger(s) to OPERABLE status. B. One or more required B.1 Restore battery terminal 2 hours battery chargers on one voltage to greater than required station service DC or equal to the minimum subsystems inoperable, established float voltage. AND AND The redundant subsystem B.2,, Verify battery float .Once per 12 hours HATCH UNIT 1 3.8-31 Amendment No. 2-2 I

DC Sources - Shutdown 3.8.5 CONDITION REQUIRED ACTION COMPLETION TIME battery, and required current < 20 amps. chargers OPERABLE. AND B.3 Restore battery 72 hours charaer(s) to OPERABLE status. AC. One or more required DG or AC.1 Declare affected Immediately station service DC electrical required feature(s) power subsystems inoperable. inoperable for reasons other than Conditions A or B. OR OR AC.2.1 Suspend CORE Immediately ALTERATIONS. Required Actions and associated Completion AND Times of Conditions A or B not met AC.2.2 Suspend movement of Immediately irradiated fuel assemblies in the secondary containment. AND continued) HATCH UNIT 1 3.8-32 HATH UIT 3.-32Amendment No. 22-7 I

DC Sources - Shutdown 3.8.5 ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME AC. (continued) AC.2.3 Initiate action to Immediately suspend operations with a potential for draining the reactor vessel. AND AC.2.4 Initiate action to restore Immediately required DC electrical power subsystems to OPERABLE status. SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY SR 3.8.5.1-------------NOTE-The following SRs are not required to be performed: SR 3.8.4J.-72and SR 3.8.4.38. For required Unit 1 DC sources, the following SRs In accordance with are applicable: applicable SRs SR 3.8.4.1 SR 3.8.1.1! SR 3.8.1!.7 SR 3.8.4.2 SR 3.8.1!.5 SR 3.8.1.8. SR 3.8.4.3 SR-3.48.,6 SR 3.8.5.2 For required Unit 2 DC sources, SR 3.8.5.1 of In accordance with Unit 2 Specification 3.8.5 is applicable. Unit 2 SR 3.8.5.1 HATCH UNIT 1 3.8-33 HATH UIT 3.-33Amendment No. 2-2-7 I

DC Sources - Shutdown 3.8.5 3.8 ELECTRICAL POWER SYSTEMS 3.8.5 DC Sources - Shutdown LCO 3.8.5 The following DC electrical power subsystems shall be OPERABLE:

a.

The Unit 2 DC electrical power subsystems needed to support the DC electrical power distribution subsystem(s) required by LCO 3.8.8, "Distribution Systems - Shutdown"; and

b.

The Unit 1 DG DC electrical power subsystems needed to support the equipment required to be OPERABLE by LCO 3.6.4.3, "Standby Gas Treatment (SGT) System"; and LCO 3.7.4, "Main Control Room Environmental Control (MCREC) System"; LCO 3.7.5, "Control Room Air Conditioning (AC) System"; and LCO 3.8.2, "AC Sources - Shutdown." MODES 4 and 5, During movement of irradiated fuel assemblies in the secondary containment. APPLICABILITY: ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A. One required battery A.1 Restore battery terminal 2 hours charger on one or more voltage to g reater than required DG DC or equal to the minimum subsystems inoperable. established float voltage. AND AND The redundant subsystem A.2 Verify battery float Once per 12 hours battery and required current < 5 amps. chargers OPERABLE. AND A.3 Restore battery 72 hours charaer(s) to OPERABLE status. B. One or more required B.1 Restore battery terminal 2 hours battery chargers on one voltage to greater than required station service DC or equal to the minimum subsystems inoperable, established float voltage. AND AND HATCH UNIT 2 3.8-31 HATH UIT 3.-31Amendment No. -I69 I

DC Sources - Shutdown 3.8.5 CONDITION REQUIRED ACTION COMPLETION TIME The redundant subsystem B.2 Verify battery float Once per 12 hours battery, and required current < 20 amps. chargers OPERABLE. AND B.3 Restore battery 72 hours charger(s' to OPERABLE status. AC. One or more required DG or AC.1 Declare affected Immediately station service DC electrical required feature(s) power subsystems inoperable. inoperable for reasons other than Conditions A or B. OR OR AC.2.1 Suspend CORE Immediately ALTERATIONS. Required Actions and associated Completion AND Times of Conditions A or B not met AC.2.2 Suspend movement of Immediately irradiated fuel assemblies in the secondary containment. AND ________________________(continued) HATCH UNIT 2 3.8-32 HATC UNI 2 38-32Amendment No. 69

DC Sources - Shutdown 3.8.5 ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME AC. (continued) AC.2.3 Initiate action to Immediately suspend operations with a potential for draining the reactor vessel. AND AC.2.4 Initiate action to restore Immediately required DC electrical power subsystems to OPERABLE status. SURVEILLANCEREQUIREMENTS________ SURVEILLANCE FREQUENCY SR 3.8.5.1------------NOTE-------- The following SRs are not required to be performed: SR 3.8.4.7-2_and SR 3.8.4.3=8. For required Unit 2 DC sources, the following SRs In accordance with are applicable: applicable SRs SR 3.8.4.1 SR 3,81. SRi I 3.8. 1.7 SR 3.8.4.2 SR 3.8.1.5 SR 3.8.1.8. SR 3.8.4.3 R3 7 A SR 3.8.5.2 For required Unit 1 DC sources, SR 3.8.5.1 of In accordance with Unit 1 Specification 3.8.5 is applicable. Unit 1 SR 3.8.5.1 HATCH UNIT 2 3.8-33 HATH UIT 3.-33Amendment No. 4-6-9 n

Battery Ge4I-Parameters 3.8.6 3.8 ELECTRICAL POWER SYSTEMS 3.8.6 Battery Gell-Parameters LCO 3.8.6 APPLICABILITY: Battery eel-Iparameters for the station service and DG electrical power subsystem batteries shall be within t-he-limits of Table 3.8.6-1. When associated DC electrical power subsystem is required to be OPERABLE. ACTIONS NOT Separate Condition entry is allowed for each battet I-- CONDITION REQUIRED ACTION COMPLETION TIME oneh or more att~efry, cell electro,"lyte÷ leveal and C~ategor A or, B limits. Tabehl&64Q* Gat÷..... C-l~Pts~ A.2 Vecrify battery cell 24 heuars paraeter m**,,3eet Table-3.&64 A! A ^.3' Restore batter; cell 31~. 4*-,d.y. of Table 3.8.6-1. {eeRt~Rued} I HATCH UNIT 1 3.8-33 HATC UNI 1 38-33Amendment No. 2-27

Battery Gell-Parameters 3.8.6 ACTIONS ('continued) CONDITION REQUIRED ACTION COMPLETION TIME A. One DG or station service battery on one subsystem with one or more battery cells float voltage < 2.07 V. A.1 Perform SR 3.8.4.1. AND A.2 Perform SR 3.8.6.1. AND A.3 Restore affected cell voltage > 2.07 V. 2 hou rs. 2 hour 24 hours B. One DG battery on one B.1 Perform SR 3.8.4.1. 2 hours subsystem with float current >a s.AND B.2 Restore battery float 12 hours current to < 5 amps. C. One station service batterv C.1 Perform SR 3.8.4.1. 2 hours on one subsystem with float current > 20 amos. AND C.2 Restore battery float 12 hours current to _< 20 amos. -NOTE NOTE----- Required Action D.2 shall be Required Actions D.1 and D.2 comoleted if electrolyte level are only applicable if electrolyte was below the top of olates. level was below the too of D. One DG or station service battery on one subsystem D.1 Restore electrolyte level 8 hours with one or more cells to above too of olates. electrolyte level less than minimum established design AND limits__ D.2 Verify no evidence of 1 or leakage. AND D.3 Restore electrolyte level31dy to__reater than or equal___________ HATCH UNIT 1 3.8-34 HATC UNI 1 38-34Amendment No. 2-66 I

Battery Gell-Parameters 3.8.6 to minimum established design limits. E. One DG or station service E.1 Restore battery pilot cell 12 hours battery on one subsystem temperature to areater with pilot cell electrolyte than or equal to temperature less than minimum established minimum established design design limits. limits. F. One or more batteries in F.1 Restore battery 2 hours redundant subsystems with parameters for batteries battery, parameters not in one subsystem to within limits, within limits. 8G. Required Action and associated Completion Time of Condition A B C ,Eor Fnot met. OR One DG battery on one subsystem with one or more battery cells float voltage < 2.07 V and float current > 5 amps. OR_ One station service battery on one subsystem with one or more battery cells float voltage < 2.07 V and float current > 20 amps. Onc÷h; ormoe ateie wt pvcrag electrolyteL* BG. 1 Declare associated battery inoperable. Immediately flmn nr rnnrn k.,+4n rifle,,R,4k one or more batter" cell parameters not within Category C limits. HATCH UNIT 1 3.8-35 Amendment No. 266 I HATCH UNIT 1 3.8-35 Amendment No. 2-66

Battery Gell-Parameters 3.8.6 SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY SR 3.86. Verif*";*y battcr parameters moot, Tab,,,e3.8.6-1 In accordanc with Categoy A lmitbtherSurveillance SR 3.8.6.2 VeNybteyOelprmTErmotTbe3861Iacrdnewh Catdegory Bslimtinsric batr laurns< the Surveillance 20 amps.Frequency Control SR 3.8.6.3 Verify aeracDGea eaechrstatitemperature ofter In accordance with rpresetatv cellsfotvot is > 2. 0 7 foV ah. tto the Surveillance sericebater'andŽ 1 0F or achDG attr" Frequency Control Program SR3..63 Verify each DG batteryh floaticrrnt iservic5amtes In accordance with cionet cellfloa veletrolye is vel 2.0 V. aertano the Surveillance HATCH UNIT 1 3.8-36 Amendment No. 266

Battery CellParameters 3.8.6 equal to minimum established design limits. Frequency Control Program SR 3.8.6.4 Verify each DG and each station service battery In accordance with pilot cell temperature is greater than or equal to the Surveillance minimum established design limits. Frequency Control Program SR 3.8.6.5 Verify each DG and each station service battery In accordance with connected cell float voltage is > 2.07 V. the Surveillance Freauencv Control Program SR 3.8.6.6 .NOTE-------- This Surveillance shall not normally be performed in MODE 1.,2. or 3. However, credit may be taken for unplanned events that satisfy this SR. Verify DG and station service battery capacity is > In accordance with 80% of the manufacturer's rating when subiected the Surveillance to a performance discharge test or a modified Freauency Control performance discharge test. Program HATCH UNIT 1 3.8-37 HATC UNI 1 38-37Amendment No. 2-66 I

Battery Cell-Parameters 3.8.6 Tabin 3_£_ 1 (nnnn 1 nf 1' .a..cry..c...aram... r -¶egcuiremcnrs C"A TEGORY-C: I V CATEGORY A: CATEGORY B: LMT LIMITS FOR EACH LIMITS FOR EACH FREC PARAMETER DESIGNATED PILOT CELL CONNECICTED CELLI CONNECTED CELL mark, and.. *... i... nc /indication mark, and4O;W,,, indication mark* aiu ee indication mark* "peelie .200 Ž->-----95 Not*, more than, connected cells AND maximum.level.during equalizing. charges provided it is not ovedloio'-ng. (b) Ill Corete for elcrlyte* ternI* portur an kleIvel. Level correctionl is not required;l Iltf l Vu I n....... I LII I IJLAL II LLI~t I 1 I7UTL'Jr/ TIr 1 I" I I "r llT r 'J ll l [ r l n lj ~ l l nnA ... fl

• nrn Tnr Iflf_

kn++nr ,1p. J Ifl I p nnrTnfl' C~rIO Vfllflfl C" 1Y1flflT /%? -. 1 0 mn yr O?0tIflfl Cnn IIC'CI flnttnrInp Ilnf-4 LI I-. omon tnr I I LI I~ LLI I 3 LII I LVI II I LII..IIILIIIL LII II.4 I I I ~.I I LI I LI LI.ALILII I LILITV ILILI I.JLAULLITILILI LAI1LI'.vLIVLIarITfrr .fl-. hnftrrnr!' 'hnn nn flnnt2.,nhnrnn HR 2nr'ntnnh~n fn-r nnnfinri en~nnfjr..nrnl/i+,* I!ifri u,

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,.J.1.* i.jjjL-.w,, y, a ua...~ I 'LILIL di ~.. sarisrv CJJCCITIC uravitv rcuuircrncrus. succiric oravirv or cacn connectec ccii snaii oc J l J 1 i I f al i j measurec prior to expiration or tne / cay allowance. HATCH UNIT 1 3.8-38 HATC UNI 1 38-38Amendment No. 22-7

Battery G=ell-Parameters 3.8.6 3.8 ELECTRICAL POWER SYSTEMS 3.8.6 Battery G=ell-Parameters LCO 3.8.6 APPLICABILITY: Battery cell parameters for the station service and DG electrical power subsystem batteries shall be within the-limits of Tablo 3.8.6-1. When associated DC electrical power subsystem is required to be OPERABLE. ACTIONS NOTE----------------- Separate Condition entry is allowed for each battery. CONDITION REQUIRED ACTION COMPLETION TIME III A Onc or more U~LLUIIL~. A.1 Verify pilot ceiis one or more battery cell electrolyte level and parameters not within float voltage meet Category A or B limits. TabIe4&84 Categor; C limits. Verify batter' cell 2A-heu~s parameters meet Tab4e48~4 Category C limits. O~ee-pe~-7-days the~eaft& AN~ A.3 Restore battery cell ~1-days pa~amet&s-te Category A and B limits of Table 3.8.61. (ee~t~ued} HATCH UNIT 2 3.8-33 HATCH NIT 2 .8-33Amendment No. 1-69

Battery CellI-Parameters 3.8.6 ACTIONS (continued) CONDITION REQUIRED ACTION COMPLETION TIME A. One DG or station service battery on one subsystem with one or more battery cells float voltage < 2.07 V. A.1 Perform SR 3.8.4.1. AND A.2 Perform SR 3.8.6.1. AND A.3 Restore affected cell voltage > 2.07 V. 2 hours 2 hours 24 hours B. One DG battery on one B.1 Perform SR 3.8.4.1. 2 hours subsystem with float current > 5 amps. AND B.2 Restore battery float 12 hours current to < 5 amps. C. One station service battery C.1 Perform SR 3.8.4.1. 2 hours on one subsystem with float current > 20 amps. AND C.2 Restore battery float 12 hours current to < 20 amps. -NOTE NOTE-............. Required Action D.2 shall be Required Actions D.1 and D.2 completed if electrolyte level are only applicable if electrolyte was below the top of olates, level was below the too of olates. D. One DG or station service battery on one subsystem D.1 Restore electrolyte level 8 hours with one or more cells to above too of olates. electrolyte level less than minimum established design AND limits. D.2 Verify no evidence of 12 hours leakage. AND D.3 Restore electrolyte level 31 days to greater than or equal HATCH UNIT 2 3.8-34 HATC UNI 2 38-34Amendment No. 2-1-0 I

Battery GelLparameters 3.8.6 to minimum established design limits. E. One DG or station service E.1 Restore battery pilot celi 12 hours battery on one subsystem temperature to areater with pilot cell electrolyte than or equal to temperature less than minimum established minimum established design design limits. limits. F. One or more batteries in F.1 Restore battery 2 hours redundant subsystems with parameters for batteries battery parameters not in one subsystem to within limits, within limits. BG. Required Action and associated Completion Time of Condition A B,_ C_ D. E. or F not met. OR One DG battery on one subsystem with one or more battery cells float voltaae < 2.07 V and float current > 5 amps. OR One station service battery on one subsystem with one BG.1 Declare associated battery inoperable. Immediately or morer hafft.rv n.pIll. flnat voltaae -* 2.07 V and float current > 20 amps. Oneor or bateic, withn vr agccer',o*'* l-yto,",1, r,", '.:tcmpcramtursf.h I-'.- one,*, ori mr.e.-, batteI-,ry, c'll1 pramete*r-s not-wihin HATCH UNIT 2 3.8-35 Amendment No. 2-1-0 I HATCH UNIT 2 3.8-35 Amendment No. 2-1-8 I

Battery GelI-Parameters 3.8.6 SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY SR 3.8.6.21eiybteycl aaeesmo TabEle........8.6.1...accrdanc...t Gandeach staiorn seric batr laurns< the Surveillance 20 amps.Frequency Control Program SR 3.8.6.3 Verify eachDGag d elechtrolteo temerature ofter In accordance with repenntatied clellstrolyteevelfor eachr sthatin or the Surveillance HATCH UNIT 2 3.8-36 Amendment No. 2-1-0

Battery Gell-Parameters 3.8.6 equal to minimum established design limits. Frequencv Control Program SR 3.8.6.4 Verify each DG and each station service battery In accordance with pilot cell temperature is greater than or equal to the Surveillance minimum established desiqn limits. Freauencv Control SR 3.8.6.5 Verify each DG and each station service battery In accordance with connected cell float voltage is > 2.07 V. the Surveillance Freauencv Control Program SR 3.8.6.6 NOTE-------- This Surveillance shall not normally be performed in MODE 1, 2. or 3. However, credit may be taken for unplanned events that satisfy this SR. Verify DG and station service battery capacity is >_ In accordance with 80% of the manufacturer's rating when subjected the Surveillance to a performance discharge test or a modified Freauencv Control performance discharge test. Program HATCH UNIT 2 3.8-37 HATC UNI 2 38-37Amendment No. 2-1-0 [

Battery Cell-Parameters 3.8.6 Table 3.8.6 1*_ (prag 1 o~f 1) Batr Cell Parame' ter Reuiement CATEGORY C: CATEGORY A: CATEGORY B:LM-T LIMITS FOR EACH LIMITS FOR EACH FOR-EACH4 PARAMETER DESIGNA^TED PILOt"T C-ElL CONNlklkEC'TEDl C-ELL CONNt*XECTED C-ElL EIeelaefr4e-tevI M*a /in-imu m leveal indicati,-o~-n Min/iramu m leelAov-1po !indication marlt Gravlt-y(*' 0.020-below AND aeaeo-l conneced ellse! cnctdclsAND (a) It is acceptable for the electrol~4e level to temporarily increase above the specified maximum level during equalizing charges provided it is net ove~lowing. (b) Corrected for electrolyte temperature and level. Level correction is not required; i:uvvuvu.,vv..t;;.w: z:u~n u;:aryu uattury LAIUIyIHy and 0.5 am for DG batteries. urrip*.:: uor,s[U.IU;I i,,uVIuu_ u ((uuiu / \\ A 1

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notran, nnnrnlrfl a i Wynn, flI

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4. sausiv succmc uravrEv rcuuircmenis. $iJrJpiiiC ijrpvitv 01 eaen connecica ccii snaii oc I i a I -j f el I tl mnnsnrcci orior to exoirarion or me / oat' aitowanert . 3 HATCH UNIT 2 3.8-38 HATC UNI 2 38-38Amendment No. 24 I

Programs and Manuals 5.5 5.5 Programs and Manuals 5.5.14 Control Room Envelope Habitability Procqram (continued) Frequencies specified in Sections 0.1 and 0.2 of Regulatory Guide 1.197, Revision 0.

d.

Measurement, at designated locations, of the ORE pressure relative to all external areas adjacent to the ORE boundary during the pressurization mode of operation by one subsystem of the MOREC System, operating at the flow rate required by the VFTP, at a Frequency of 24 months on a STAGGERED TEST BASIS. The results shall be trended and used as part of the 24 month assessment of the ORE boundary.

e.

The quantitative limits on unfiltered air inleakage into the ORE. These limits shall be stated in a manner to allow direct comparison to the unfiltered air inleakage measured by the testing described in paragraph c. The unfiltered air inleakage limit for radiological challenges is the in leakage flow rate assumed in the licensing basis analyses of DBA consequences. Unfiltered air inleakage limits for hazardous chemicals must ensure that exposure of ORE occupants to these hazards will be within the assumptions in the licensing basis.

f.

The provisions of SR 3.0.2 are applicable to the Frequencies for assessing ORE habitability, determining ORE unfiltered inleakage, and measuring ORE pressure and assessing the ORE boundary as required by paragraphs c and d, respectively. 5.5.15 Battery Monitoring and Maintenance Proaram This Program provides controls for battery restoration and maintenance. The program shall be in accordance with IEEE Standard (Std' 450-2002. "IEEE Recommended Practice for Maintenance. Testing. and Replacement of Vented Lead-Acid Batteries for Stationary Applications," as endorsed by Regulatorv Guide 1.129. Revision 2 (RG). with RG exceptions and program provisions as identified below:

a.

The program allows the following RG 1.129. Revision 2 exceptions:

1.

Battery temperature correction may be performed before or after conducting discharge tests.

2.

RG 1.129. Regulatory Position 1. Subsection 2, "References." is not applicable to this program.

3.

In lieu of RG 1.129. Regulatory Position 2. Subsection 5.2. "Inspections." the following shall be used: "Where reference is made to the pilot cell. pilot cell selection shall be based on the lowest voltage cell in the battery." 4In Regulatory Guide 1.129. Regulatory Position 3. Subsection 5.4.1. "State of Charge Indicator." the following statements in paragraph (d) may be omitted: "When it has been recorded that the charging current HATCH UNIT 1 5.0-18 HATC UNI I 50-18Amendment No. 2-68 I

Programs and Manuals 5.5 has stabilized at the chargingl voltage for three consecutive hourly measurements. the battery is near full charge. These measurements shall be made after the initially high charging current decreases sharply and the battery voltage rises to approach the charger output voltage."

5.

In lieu of RG 1.129. Regulatory Position 7. Subsection 7.6. "Restoration". the following may be used: "Following the test. record the float voltage of each cell of the string."

b.

The program shall include the following provisions:

1.

Actions to restore battery cells with float voltage < 2.13 V:

2.

Actions to determine whether the float voltage of the remaining battery cells is >_ 2.13 V when the float voltage of a battery, cell has been found to be < 2.13 V:

3.

Actions to equalize and test battery cells that had been discovered with electrolyte level below the top of the plates:

4.

Limits on average electrolyte temperature, battery connection resistance. and battery terminal voltage: and

5.

A requirement to obtain specific gravity readings of all cells at each discharge test. consistent with manufacturer recommendations. HATCH UNIT 1 5.0-19 HATC UNI I 50-19Amendment No. 2-68 I

Programs and Manuals 5.5 5.5 Programs and Manuals 5.5.14 Control Room Envelope Habitability Program (continued) Frequencies specified in Sections 0.1 and 0.2 of Regulatory Guide 1.197, Revision 0.

d.

Measurement, at designated locations, of the ORE pressure relative to all external areas adjacent to the ORE boundary during the pressurization mode of operation by one subsystem of the MOREC System, operating at the flow rate required by the VFTP, at a Frequency of 24 months on a STAGGERED TEST BASIS. The results shall be trended and used as part of the 24 month assessment of the ORE boundary.

e.

The quantitative limits on unfiltered air inleakage into the ORE. These limits shall be stated in a manner to allow direct comparison to the unfiltered air inleakage measured by the testing described in paragraph c. The unfiltered air inleakage limit for radiological challenges is the inleakage flow rate assumed in the licensing basis analyses of OBA consequences. Unfiltered air inleakage limits for hazardous chemicals must ensure that exposure of ORE occupants to these hazards will be within the assumptions in the licensing basis.

f.

The provisions of SR 3.0.2 are applicable to the Frequencies for assessing ORE habitability, determining ORE unfiltered inleakage, and measuring ORE pressure and assessing the ORE boundary as required by paragraphs c and d, respectively. 5.5.15 Battery Monitoring and Maintenance Program This Program provides controls for battery restoration and maintenance. The program shall be in accordance with IEEE Standard (Std) 450-2002. "IEEE Recommended Practice for Maintenance, Testing. and Replacement of Vented Lead-Acid Batteries for Stationary Applications," as endorsed by Regulatory Guide 1.129. Revision 2 (RG). with RG exceptions and program provisions as identified below:

a.

The program allows the following RG 1.129. Revision 2 exceptions:

1.

Battery temperature correction may be performed before or after conducting discharge tests.

2.

RG 1.129. Regulatory Position 1. Subsection 2, "References." is not applicable to this program.

3.

In lieu of RG 1.129. Regulatory Position 2. Subsection 5.2. "Inspections." the following shall be used: "Where reference is made to the pilot cell. pilot cell selection shall be based on the lowest voltage cell in the battery." 4 In Regulatory Guide 1.129, Regulatory Position 3. Subsection 5.4.1. "State of Charae Indicator." the following statements in paragraph (d' may be omitted: "When it has been recorded that the charging current HATCH UNIT 2 5.0-18 HATC UNI 2 50-18Amendment No. 2--1-a

Programs and Manuals 5.5 has stabilized at the charging voltage for three consecutive hourly measurements. the battery is near full charge. These measurements shall be made after the initially high charging current decreases sharply and the battery voltage rises to approach the charger output voltage."

5.

In lieu of RG 1.129. Regulatory Position 7, Subsection 7.6. "Restoration". the following may be used: "Following the test. record the float voltage of each cell of the string."~

b.

The program shall include the following provisions:

1.

Actions to restore battery cells with float voltage < 2.13 V:

2.

Actions to determine whether the float voltage of the remaining battery cells is > 2.13 V when the float voltaae of a battery cell has been found to be < 2.13 V:

3.

Actions to equalize and test battery cells that had been discovered with electrolyte level below the top of the plates:

4.

Limits on average electrolyte temperature, battery connection resistance. and battery terminal voltage: and

5.

A requirement to obtain specific gravity readings of all cells at each discharge test. consistent with manufacturer recommendations. HATCH UNIT 2 5.0-19 HATC UNI 2 50-19Amendment No. 24 I

DC Sources - Operating B 3.8.4 B 3.8 ELECTRICAL POWER SYSTEMS B 3.8.4 DC Sources - Operating BASES BACKGROUND The DC electrical power system provides the AC emergency power system with control power. It also provides both motive and control power to selected safety related equipment. As required by 10 CFR 50, Appendix A, GDC 17 (Ref. 1), the DC electrical power system is designed to have sufficient independence, redundancy, and testability to perform its safety functions, assuming a single failure. The DC electrical power system also conforms to the recommendations of Regulatory Guide 1.6 (Ref. 2) and IEEE-308 (Ref. 3). The station service DC power sources provide both motive and control power to selected safety related and nonsafety related equipment. Each DC subsystem is energized by one 125/250 V station service battery (consisting of two 125 V batteries in series),. and three 125 V battery chargers (two normally inservice chargers and one standby charger). Each battery is exclusively associated with a single 125/250 VDC bus. Each set of battery chargers exclusively associated with a 125/250 VDC subsystem cannot be interconnected with any other 125/250 VDC subsystem. The normal and backup chargers are supplied from the same AC load groups for which the associated DC subsystem supplies the control power. The loads between the redundant 125/250 VDC subsystem are not transferable except for the Automatic Depressurization System, the logic circuits and valves of which are normally fed from the Division 1 DC system. The diesel generator (DG) DC power sources provide control and instrumentation power for their respective DG and their respective offsite circuit supply breakers. In addition, DG 1A power source provides circuit breaker control power for the respective Division I loads on 4160 VAC buses 1 E and 1 F, and DG 1 C power source provides circuit breaker control power for the respective Division II loads on 4160 VAC buses 1F and 1G. Each DG DC subsystem is energized by one 125 V battery and two 125 V battery chargers (one normally inservice charger and one standby charger). During normal operation, the DC loads are powered from the respective station service and DG battery chargers with the batteries floating on the system. In case of loss of normal power to any battery charger, the DC loads are automatically powered from the associated battery. This will (continued) HATCH UNIT 1 B385 EIIN3 B3.8-52 REVISION 33

DC Sources - Operating B 3.8.4 BASES BACKGROUND result in the discharging of the associated battery (and affect the (continued) battery cell parameters). The DC power distribution system is described in more detail in Bases for LCO 3.8.7, "Distribution System - Operating," and LCO 3.8.8, "Distribution System - Shutdown." Each battery*"o ha, ad.quat torag capac ity to carry. theqiedla co..-ntinosly for-. approx-.b

• "*imate~ly 2 hou-, rs (Ref. 1).

Each DC battery subsystem is separately housed in a ventilated room apart from its charger and distribution panels. Each subsystem is located in an area separated physically and electrically from the other subsystems to ensure that a single failure in one subsystem does not cause a failure in a redundant subsystem. There is no sharing between redundant Class 1 E subsystems such as batteries, battery chargers, or distribution panels. Each battery, has adequate.storaae capacity, to meet the duty CvCle(s' discu___ssed in the.FSAR. Chapter 8 (Ref_4). The battery is designe~Ad_ with additional capacity, above that required by the design duty cycle to allow for tem~perature var~iations_.and other factors_. The batteries for DC electrical power subsystems are sized to produce required capacity at 80% of nameplate rating, corresponding to warranted capacity at end of life. The minimum design voltage limit is 105/210 V. The battery cells..are of flood~ed lead acid..cons~tr~uction with a nominal specific gravitv of 1.2.15. This specific gravity corresponds to an open circuit battery vo~ltagae of approximately 124 V for a 60 cell battery (i.e.,. cell voltage of 2.07 volts per cell (VpcV). The open circuit voltaaei .the voltage maintained when there, is no. charging _gor dischargig Once fully charged with its open circuit voltaae > 2.07 Vp~c. the battery cell will maintain its capacity fo~r 30 days without further charging ~oerp mranufacturer's instructions. Optimal long term performance ho~wever. i~s.obtained by maintaining a float voltage 2.20 to 2.25 Voc. This p~rovides adequate over-potential, which limits..the formation of lead sulfate and self discharge. The nominal float.voltage of 2.20 Vpc .correspoonds to a. total float voltage output of 132 V for a 60 cell battery as discus~sed in the FSAR. Chapter 8 (Ref. 4). Each battery charger of the DC electrical power subsystem has ample power output capacity for the steady state operation of connected loads required during normal operation, while at the same time maintaining a fully charged battery. Each battery charger has sufficient excess capacity to restore the battery from the design (continued) HATCH UNIT 1 B 3.8-53 REVISION 33

DC Sources - Operating B 3.8.4 minimum charge to its fully charged state within 24 hours while supplying normal steady state loads (Ref. 4). The battery.charger is normally in the f.loa~t-charge mode. Float_- charahhh~~~hqe is the condition in._w~hich the charger is suppl.vina t~he* connected loads and the battery cells are r~eceiving ad~equate current to optimally charae the battery. This as~su~res the internal losses of a battery are overcome and the battery is maintained in a fully chharoeged_ state. _When desired, the cha~raer can bepolaced in the equalize mode. The ee~qualize mode is at a higher voltaae than the float mode and chargingg current is correspondingly higher. The battery, charoe soertdi .the equalize mode after a battery, discharct~e or for routine maintenance. Followin&gabattery discharge, the battery rechargqe characteristic accepts current at the current limit of the batterv charager if tedshre was signif~icant. eg. olown a battery service te~st) un~til the battery, terminal voltage approaches the c~haroe vltej setpoint. Cha~rging current then reduce xonentially during the remainder. of the r.echaraqe cycle. Lead-calcium batteries have rehre efficiencies ofgareater than 95%. so once at least 105% of the ampere-hours discharged have been returned, the battery .caoacitv would be.restored to the same condition as it was p~ri~or to the discharge. This can be monitored bybdirect observation of the eoxonentialvdcyn chagingcurret or by evaluating, the amp-. hours dischbarged from the battery and amp-hours returned to the A description of the Unit 2 DC power sources is provided in the Bases for Unit 2 LCO 3.8.4, "DC Sources - Operating." APPLICABLE SAFETY ANALYSES The initial conditions of Design Basis Accident (DBA) and transient analyses in the FSAR, Chapters 5 and 6 (Ref. 5), and Chapter 14 (Ref. 6), assume that Engineered Safety Feature (ESF) systems are OPERABLE. The DC electrical power system provides normal and emergency DC electrical power for the DGs, emergency auxiliaries, and control and switching during all MODES of operation. The OPERABILITY of the DC subsystems is consistent with the initial assumptions of the accident analyses and is based upon meeting the design basis of the unit. This includes maintaining DC sources OPERABLE during accident conditions in the event of: (continued) HATCH UNIT 1 B385 EIIN3 B3.8-54 REVISION 33

DC Sources - Operating B 3.8.4 BASES APPLICABLE

a.

An assumed loss of all offsite AC power sources or all onsite SAFETY ANALYSES AC power sources; and (continued)

b.

A postulated worst case single failure. The DC sources satisfy Criterion 3 of the NRC Policy Statement (Ref. 13). LCO The Unit 1 DC electrical power subsystems--with: 1) each station service DC subsystem consisting of.one 125/250 V station service batter, (~two 125 V batteries in series)=, two battery chargers, and the corresponding control equipment and interconnecting cabling supplying power to the associated bus; and 2) each DG DC subsystem consisting of one battery bank, one battery charger, and the corresponding control equipment and interconnecting cabling -- are required to be OPERABLE to ensure the availability of the required power to shut down the reactor and maintain it in a safe condition after an anticipated operational occurrence (AOO) or a postulated DBA. In addition, some components required by Unit 1 require power from Unit 2 sources (e.g., Standby Gas Treatment (SGT) System and Low Pressure Coolant Injection (LPCI) valve load centers). Therefore, the Unit 2 DG DC and the swing DG DC electrical power subsystems needed to provide DC power to the required Unit 2 components are also required to be OPERABLE. Thus, loss of any DC electrical power subsystem does not prevent the minimum safety function from being performed (Ref. 4). APPLICABILITY The DC electrical power sources are required to be OPERABLE in MODES 1, 2, and 3 to ensure safe unit operation and to ensure that:

a.

Acceptable fuel design limits and reactor coolant pressure boundary limits are not exceeded as a result of AOOs or abnormal transients; and

b.

Adequate core cooling is provided, and containment integrity and other vital functions are maintained in the event of a postulated DBA. The DC electrical power requirements for MODES 4 and 5, and other conditions in which DC Sources are required, are addressed in the Bases for LCO 3.8.5, "DC Sources - Shutdown." (continued) HATCH UNIT 1 B385 EIIN3 B 3.8-55 REVISION 33

DC Sources - Operating B 3.8.4 BASES (continued) ACTIONS A..1_ If one or more of the required Unit 2 DG DC electrical power subsystems is inoperable (e.g., inoperable battery, inopierable battery charger(s), or inoperable battery charger and associated inoperable battery), or if the swing DG DC electrical power subsystem is inoperable due to performance of SR 3.8.4._37 or SR 3.8.6.4*8, and a loss of function has not occurred as described in Condition EH, the remaining DC electrical power subsystems have the capacity to support a safe shutdown and to mitigate an accident condition. In the case of an inoperable required Unit 2 DG DC electrical power subsystem, continued power operation should not exceed 7 days, since a subsequent postulated worst case single failure could result in the loss of certain safety functions (e.g., SGT System and LPCI valve load centers). The 7 day Completion Time takes into account the capacity and capability of the remaining DC sources, and is based on the shortest restoration time allowed for the systems affected by the inoperable DC source in the respective system Specification. In the case of an inoperable swing DG DC electrical power subsystem, since a subsequent postulated worst case single failure could result in the loss of minimum necessary DC electrical subsystems to mitigate a postulated worst case accident, continued power operation should also not exceed 7 days. The. 7 day Completion Time is based upon the swing DG DC electrical power subsystem being inoperable due to performance of SR 3.8.4.a37 or SR 3.8.6.64-78. Performance of these two SRs will result in inoperability of the DC battery. Since this battery is common to both units, more time is provided to restore the battery, if the battery is inoperable for performance of required Surveillances, to preclude the need to perform a dual unit shutdown to perform these Surveillances. The swing DG DC electrical power subsystem also does not provide power to the same type of equipment as the other DG DC sources (e.g., breaker control power for 4160 V loads is not provided by the swing DG battery). The Completion Time also takes into account the capacity and capability of the remaining DC sources. B.I.. B.2. and B.3 .Condition B represents..one Unit 1 DG DC subsystem with a required battery charaer inoperable (e.g.. the voltage limit of SR 3.8.4.1 is not maintained', or the..swing DG DC subs~ystem with a required battery. .charaer inooerable for reas~ons other than Condition A. The ACTIONS. provide a tiered response that focuses on returnina the b.attery, to the fully charged state and restoring a fully gualifi.ed charger to OPERABLE status in a reasonable time oeriod. Required Action B.1 requires that the battery, terminal voltage be restored to ete (continued) HATCH UNIT 1 B3.8-56 REVISION 33

DC Sources - Operating B 3.8.4 than or equal to the minimum established float voltage within 2 hours_. This time pro~vides for returning the inoperabl~e chbarger to OPERABLE tstat~tttttt*us or prov~iding ~an alternate means of restori.ng battery terminal voltaae tqjo areater than or equal to the minimum established float voltage. Restoring the batt~ery terminalvoltaae to.greater than or

• eaual to the minimum established float voltage provides ao

-assu~rance that. within 12 hours. the battery will be restored to its fully charged condition (Reguired Action.B.2') from any discharg egthat migqht hav~e oc~curred due to..the charaer inoperabilitv. A discharged battery having ter:minal voltage of at least the minimum established float voltage indicates th~at the batter, is on the. expo.nential chargingj .current portion (the second part) of its recharae_ cycle. The time to return a battery to its fully charae~d state u.nder this _condition is simply a function of the..amo~unt.of th~e previous discharg~e _and the recharge characteristic of the ba~tteny. Thus there is. aogod assurance of fully recharging the battery within 12 hours, avoiding a premature shutdown with its own attendant risk. If established battery, terminal float voltag~e cannot be restored, to areater than or equal to the minimum established float voltage within 2 hours, and the charaer is not operating in the current-limiting mode. a faulty, charger is indicated. A faulty charger that is incapable of maintainin.rg established battery terminal float voltage does not provide a~ssurance that it can revert to a~nd operate properly in the current limit mode that is necessary, during the re~covery period fol~lowing a batteny. dichre event that the DC system is designed for. If the charager is operating in the curr~ent limit mode after 2 hour.ta is an indication that the battery, is partially discharged and its capacity. marginos will be reduced. The time to return the battery to its fully charged condition in this cas~e is..a function of the battery c~haraqer capacity., the amount of loads on the associated DC system, the amount of the previous discharge, and the recharage chbaracteristic of the battery. The charage time can be extensive, and there is not adequate assurance that it can be recharae~d within 12 hours (Required Action B.2)i. Required Action B.2 requires that the battery float current be verified as less than or equal to.5 amps.. This indicates that. if the batter, hbad been discharged as the result of. the inoperable batteo/charger, it is now fully capable of. supplying the maximum expected load reaquirement. The 5 amp value is based on returning the battery to 95% charge and assumes a..5% desig~n margin for the batteny,, If at the expiration of the initial 12 hour period the batter, f loat current is noEtless than or equal to 5 amps this indicates there may be additional battery problems and the batt.ery must be declared, inoperable. Rlegui~red Action 8.3 limits the restoration time for the inoperable (continued) HATCH UNIT 1 B385 EIIN3 B 3.8-57 REVISION 33

DC Sources - Operating B 3.8.4 ba ett~erEy__charer to 72 hours. This acti~on i~s app~licab~le if an alternate means of restoring battery terminal v~ol~taae to areater than or equal to the minimum established float voltaae has been used (e.g.. balance of D.!ant non-Class 1 E battery charger'. The 72 hour Completion Time reflects a rea~sonabl~e time to effect re~stor~ati~on of the qualifiled ba~ttery charger to O.PERABLE statu~s. BC.1 If a Unit 1.DG.DC _electrical power sub~system i~s inoperable forlll reasons other than Condition B. or if the.__swing DG DC electrical power subsystem is inoperable (for reasons other than Condition A o__r _B}. (e.g. inooerable battery or inooerable batter CharLC and assocaedioerable battery)*, the remaining DC electrical power subsystems have the capacity to support a safe shutdown and to mitigate an accident condition. Since a subsequent postulated worst case single failure could result in the loss of minimum necessary DC electrical subsystems to mitigate a postulated worst (continued) HATCH UNIT 1 B385 EIIN3 B3.8-58 REVISION 33

DC Sources - Operating B 3.8.4 BASES ACTIONS BC_. 1 (continued) case accident, continued power operation should not exceed 12 hours. The 12 hour Completion Time provides a period of time to correct the problem commensurate with the importance of maintaining the DG DC electrical power subsystem OPERABLE. (The DG DC electrical power subsystem affects both the DG and the offsite circuit, as well as the breaker closure power for various 4160 VAC loads, but does not affect 125/250 VDC station service loads.) D.1. D.2. and..D.3 Condition D represents o.ne Unit 1 station service DC sub~system with one or more reauired battery, chargers inoperable (e~g.. the voltage_ limit of SR 3.8.4.1 is not.maintained'). The ACTIONS provide a tier~ed response that focuses on returning the. battery to the fully char eoe~d state and restoin a fully gualified charger to OPERABLE status in a reasonable time period. Required Action D.1 r~eguires that the battery. terminal voltage be re~stor~ed to..greate~r than or eaual to the minimum_ .es~tablished float voltage within 2 hours..This time p~rovide~s for returning the inoperable charger to OPERABLE status or providing ann alternate means, of restori~ng battery tverminal voltage toaeaethno e__a t te minimum established float voltage. Restoring the battery, Lerminal voltage to greater than or eaual to the minimum established float voltage provides good assurance that. within 12 hours.s th~e b~atter, will be restored to i~ts fully ccharaed condition (Reguired Action D.2').from.any dischar~ge that might have occurred due to the chare inoperability A discharged battery, having terminal, voltage of at least the minoimu~m established float voltagoe indicates that the batten, is gonthe exponential charg ingc~u~rrent portion (the second part') of its recharae_ .cycle. The time to return a battery to its fully char.aqed state under this .co~ndition is simply a function of the amount of the previous discharge_ and the re~charge characteristic of the battery. Thus there is aood assurance of fully recharging the battery, within 12 hours. avoidin~ga Prmtresudwn with its own attendant risk_. If established battery, terminal float voltage cannot be restored to greater than or eaual to the minimum0 established flo~at vo~ltaae within 2 hours. and the charaer is not op~erating i~n the. current-limiting mode. a faulty, charaer is indicated. A faulty charger that is incapable of maintai~ning established battery terminal float voqltage does not provide assurance that it can revert to and operate properly in the.current limit mode that is ne~ce~ssari during the...re~covery period following a battery discharge event that the DEC system is designdfr (continued) HATCH UNIT 1 B 3.8-59 REVISION 33

DC Sources - Operating B 3.8.4 If the char~ger. is operating in the current limait mode after 2 hours. that. is an indication that the battery is partially discharged and its capacity m__.aLarli~ns will be reduced. The time to return the battery to its fully ch__haroed condition in this case is a function o~f the battery charae .capaci.ty, the amount of loads on the associate~d.DC system., the amou~nt of the prev~ious discharge, and the recharge characteristic of the..ba~ttery. The charge time can be extensive, and there is no~t adequate a ssurance that it can be recharged within 12.hours (Reguired Action D.2). Reguired Action D..2 reguires that the battery float current b~e verified as. less than or equal to 20..amps. This indi~cates..that. if the batten, had be~en dischargqed as the result of the in~operable battery chargereit is now fully capable of supplying the maximum expected load reguirement..T~he.20 amp value is based on returning the battery to 95%./ charge, and as~sumes a 5% desi.n mag_.qin for the battery. If at .the expiration of the initial 1.2 h~our period the battery flo~at current is .no~t less than or equal to 2.0 amps this indicates there may be ad~di~tionoal battery problems and the battery must be declre inoperable. Regquir~ed A~cti~on D.3 limits the restoration time for the inoperable battery, charger to 72 hours.. This action..is applicable if an alternate means of restoring battery terminal voltao to reater than or equal t~o the minimum established float v~oltaae has been used (e.g.. balance, of plant non-Class 1E. batterv charger). The 7.2 hour Comp~letion Time. reflects a reasonable time to effect restoration of the gualified batten, cbaerto OPERABLE status. E.1 Co nditi~on E reoresents one Unit 1 station service DC subsystem with one battery, inoperable. With one battery, inoperable, th~e station service DC bus is being supplied by the OPERABLE batter, chargrs Any event that results in a loss of the AC..bus..supporting the battery charaer~s will also result in loss of DC to that subsystem. The eneregqization transients of any DC loads that are beyond the capability of the. battery charaers and normally require the. assistance o~f the battery, will not be able to be brouaht onlin.e. The 12 hou~r lim~it allows sufficient ti~me to effect restor~ation of an i~nop~erable battery given that the maioritv of the coQnditions that lead to ba~ttery inopoerability (e..g.. loss of.battery charger. battery cell voltage less than or equal to 2.0"7 V.V etc.) ar~e identified in Specifications 3.8.4. 3.8.5. and 3,8.6 together with additional specific completi~on times_. GF.1 Condition 0=-Frepresents one Unit 1 station service d~9 subsystem with a loss of ability to completely respond to an event, (continued) HATCH UNIT 1 B 3.8-60 REVISION 33

DC Sources - Operating B 3.8.4 and a potential loss of ability to remain energized during normal operation. It is therefore imperative that the operator's attention focus on stabilizing the unit, minimizing the potential for complete loss of DC power to the affected disieiesubsystem. The 2 hour limit is consistent with the allowed time for an inoperable DC Distribution System dixsieasubsystem. If one of the required Unit 1 station service DC electrical power subsystems is inoperable for reasons other Conditions D or E.(e.g., inopc.rablo.+÷... b .ter, ....rbl batter,'+ c..hargcr... (or inoperable battery charger and associated inoperable battery), the remaining DC electrical power subsystems hasve the capacity to support a safe shutdown and to mitigate an accident condition. Since a subsequent postulated worst case single failure could result in the loss of minimum necessary DC electrical subsystems to mitigate a postulated worst case accident, continued power operation should not exceed 2 hours. The 2 hour Completion Time is based on Regulatory Guide 1.93 (Ref. 7) and reflects a reasonable time to assess unit status as a function of the inoperable DC electrical power subsystem and, if the DC electrical power subsystem is not restored to OPERABLE status, to prepare to effect an orderly and safe unit shutdown. DG.1 and DG.2 If the DC electrical power subsystem cannot be restored to OPERABLE status within the required Completion Time, the unit must be brought to a MODE in which the LCO does not apply. To achieve this status, the unit must be brought to at least MODE 3 within 12 hours and to MODE 4 within 36 hours. The allowed Completion Times are reasonable, based on operating experience, to reach the required plant conditions from full power conditions in an orderly manner and without challenging plant systems. The Completion Time (continued) HATCH UNIT 1 B386 EIIN3 B 3.8-61 REVISION 33

DC Sources - Operating B 3.8.4 BASES ACTIONS ___(.1 and D~G._2 (continued) to bring the unit to MODE 4 is consistent with the time required in Regulatory Guide 1.93 (Ref. 7). Condition E--_Hcorresponds to a level of degradation in the DC electrical power subsystems that causes a required safety function to be lost. When more than one DC source is lost, and this results in the loss of a required function, the plant is in a condition outside the accident analysis. Therefore, no additional time is justified for continued operation. LCO 3.0.3 must be entered immediately to commence a controlled shutdown. SURVEILLANCE The SRs are modified by a Note to indicate that SR 3.8.4.1 through REQUIREMENTS SR 3.8.4.8-3_ apply only to the Unit 1 DC sources, and that SR 3.8.4.9 4applies only to the Unit 2 DC sources. SR 3.8.4.1 Verifying battery terminal voltage while on float charge for the batteries helps to ensure the effectiveness of the, charging,,,,*,, systcm,.,nd4, the* abilit,, of* thc, batccs to, perform thcir intcnded*, function. battery charhgers, which support the ability of the batteries to perform their intended function. Float charge is the condition in which the charger is supplying the continuous charge required to overcome the internal losses of a battery (er battery ee~l)-and maintain the battery (er-a batte],,-.e..I"} in a fully charged state while. supplvin. the... continuous steady state loads of the associated DC subsy~stem. On float chare.qL b~attery cells will receive adequate current to optimally char.e ethe battery. The voltage reguirements..are based on the nominal, designL0 voltage of the battery and are consistent with the minimum float voltage established by the batter, manu~facturer (2.20 Vo~c times the number of connected cells). Fo~r example. if 60 cells are connected. the voltage at the battery terminals would be 1.32 V.V 2.2.0 Vpc times 60 .cells. With only 58 connected cells. the terminal voltage would be 127.6 V. This voltage maintains the battery plates in a condition that supports maintaining the grid life. Voltagcrqiee nt.. ar ba.sed,,, on the, no ina deinlaeo th battery 1* and ar 1 cosstn wit the iniia ,.,ol--tagest,as,.,,um~~ed in thc battary ,.iz calu.aion. Thc,-,,voltage,, *.,÷ (continued) B3.8-62 REVISION 69

DC Sources - Operating B 3.8.4 Wi*thout +... rear to* ot+herbate,

• +parameter,* this v-oltage is indicative'" of The Surveillance Frequency is controlled under the Surveillance Frequency Control Program.

(continued) HATCH UNIT 1 B 3.8-63 HATC UNT 1 3.-63REVISION 69

DC Sources - Operating B 3.8.4 BASES SURVEILLANCE REQUI REMENTS intcr rack, inatc tio.,4 andtrminal coannectio*n,prvdsainctonf ph,,sical damage... or abn.rma dctcrioratien that COUld potentially" Thc connectio r;... ositanc limits arc.. estalished4 to maintain ""onnc"ti"n resistance alow as,, reaonably,.1, p.ossibl to, minimi-,o thc o.eral IIolt°agedo across... the battery" and the. psibility of battery. The ressa¢;tnce'values ,- for each battery*,, connection are-located÷.-,, in t-he Technical Rqients Maua (Ref. 9). O The Sur~cillancp Frequency Frequency Control Program. is,-P*v.I controlled unde the* SuR,',illan-ce Visua inspection o÷f; the atr cells, cell*r plates, ad ater rek The Slr'-eillance Frequency is controlled under the Su'ac-illance SR 3_£_4_ 3nid SR 3_£_4 inter rack, inter-tier, and*, terminal connections provides4 an. indicat*ion help ensure good` electrical connections'* and to-reduecte rminal The removal. o,f visible corroion. i Jan; preventive'" maintenance SR. The* presence o'f visible co..rosion-does not nece..sari represent. a fa=ilure.

oftisS, rvde isbecorrosionis removed. d*,**4

,uring*' ....... n (continued) HATCH UNIT 1 B386 EIIN6 B 3.8-64 REVISION 69

DC Sources - Operating B 3.8.4 BASES. SURVEILLANCE SR 3.8.1,1 and SR 3.8.1.5 (contin'ucd) REQUIREMENTS The-conncct;,- n resistanco,',-,*- Imits*^ arc stab'.i-'hed t ma~cinta ÷

in T

h o..erall voltage drop across the, batter" and4 the po.sshibi,,ity of ÷ batter damage'-,- due to hea*.-ting.- o-f connections;r.. The resstace; alues* for.* The

H..

Su=ac Fre..uency is controlled,- under the Su....eill.... SR 3.8.4.62 This SR yenifies Batter" char'ge capailit requirements';'-*"** arc based on the design capacity of the batr chargers-(Ref---4}. According to Regulatory Guide 1.32 (Ref. 10), each battery charger supply is r~eelae4-r~ecommended to be based on the largest combined demands of the various steady state loads and the charging capacity to restore the battery from the design minimum charge state to the fully charged state, irrespective of the status of the unit during these demand occurrences. The minimum required amperes and duration ensures that these requirements can be satisfied. This SR p~rovides two option.s. One option requires that e___ach battery chbarer b~e capable of supplvina *. 400 amps for station service subsystems and -> 100 amps for DG subsystems at the minimum .establ!ished float voltage for. 1 hour. The ampere require m.ents. are based on the output rating of the chafqers. The voltage requirements_ are base~d on the charae olae level after a response to. a loss of AC Do~wer. The other option requires that each.battery ch~araer be capable of recharging the battery after a se.rvice test coincident with supplvinq the lalllra~llle~st coincident demands of. the various continuous stead~y state loads (irrespective of the. status of the plant during which these .deman~ds occur'. This level of loading may not nor~mally be available. fo~llowing the battery service test and will need to be supplement~ed with additional loads. The d~u.rati~on for this test may be longer than the charger sizing criteria since the battery recharge is affected by float voltage, temperature. and the exponential decay in charging current. The battery, is r~echaroged when the measured chargin.g current is -<_20 a~m.os for the station service batt~ery and < 5 amps for the DG batteries. (continued) HATCH UNIT 1 B386 EIIN6 B 3.8-65 REVISION 69

DC Sources - Operating B 3.8.4 The Surveillance Frequency is controlled under the Surveillance Frequency Control Program. SR 3.8.4.7-3 A battery service test is a special test of the battery's capability, as found, to satisfy the design requirements (battery duty cycle) of the DC electrical power system. The discharge rate and test length corresponds to the design duty cycle requirements as specified in Reference 4. The Surveillance Frequency is controlled under the Surveillance Frequency Control Program. This SR is modified by two Notes. Note 1 allows the performance of a modified performance discharge test in lieu of a service test. (continued) HATCH UNIT 1 B 3.8-66 REVISION 69

DC Sources - Operating B 3.8.4 BASES SURVEILLANCE SR 3.8.4.7-3 =(continued) REQUI REMENTS or, the, lags current.... lo'ad4 of the duty cycle, followed by t.he test{ rate,- employed4, for" t'he performance. test,bot.-{h of w^hic-h en.elop the,~ duty4,,{, 1minute discharge-, represent.. a very small portien of* the, batten,'p

capacit, t~he test rn{

,*at c",an be r chanedto "that{k for t'he perfor*mance. taest speci;fied, in the batter".... i cc. testo for* the, duratio÷;n of time equal to A modi;fied~ performance, di*l'scharge test is a test of the baterycapcit

• highest{

r v.,'{at of the, dutys.., cycle). This, ,, will often confirm the battery's ability,;.,, to meet. the critical, peio ofth load dutycyliadtono specified for4 a,*' e discharge tes.*.{.,,

• 4k-,*,{;.*

The reason for Note 2 is that performing the Surveillance would remove a required DC electrical power subsystem from service, perturb the electrical distribution system, and challenge safety systems. Credit may be taken for unplanned events that satisfy the Surveillance. The swing DG DC battery is exempted from this restriction, since it is required by both units' LCO 3.8.4 and cannot be performed in the manner required by the Note without resulting in a dual unit shutdown. A*o{ batter perform{anceh...; dichrg test. isacosanuret aact test to etect.an chng inhecaacty determined by he acc.tanc test.. Initial conditions consistent w~ith IEEE-150 need to* be-met, prior to,' the* performing,,-;-,- of, a bhatter".'performancedicagte. The t.est results.,: reflect. the overall effect,.s. o'f usage.' and age"-. A batte,"; modified performance.. discharge test is described in the Bases* for, SR 3.8.. EitherI t-;he bk*yaf'er',-'performance dischag test or*', (continued) HATCH UNIT 1 B 3.8-67 REVISION 69

DC Sources - Operating B 3.8.4 BASES SURVEILLANCE REQUIREMENTS ma" be..... to satisf;.y SR 3.8.1.8, while satisf,,,ng thc requirements of SR 3.8.1.7 at the samc timo. Thc acccptancc criteria for this Su'inl;la~nce is co',nsitnt~lml with IEEE 150* (Ref. 8) and IEEE 185 if; its; capacit i.s,* below,,*.R* 8... oQ*/-f the manufacturer's ratring. Although rapidly' increasing. This,. SR is modmified-, by, a Note.f The, reason for the-, Note,÷, is that-performing thea Suriveillannce would re'**move a requI~lired DCP elctic,,*'al system and.. chal*leng safety systems.'*;,, Credit may be* taken for. unlandt vet thaxe tio satsf thes Surveillance l other Swrilnge DG DhC Specification (SR 3.8.4.1 through SR 3.8.4.83_) are applied only to the Unit 1 DC sources. This Surveillance is provided to direet that the appropriate Surveillances for the required Unit 2 DC sources are governed by the Unit 2 Technical Specifications. Performance of the applicable Unit 2 Surveillances will satisfy both any Unit 2 requirements, as well as satisfying this Unit 1 SR. The Frequency required by the applicable Unit 2 SR also governs performance of that SR for both Units. (continued) REVISION 69 HATCH UNIT 1 B386 B 3.8-68

DC Sources - Operating B 3.8.4 BASES (continued) REFERENCES

1.

10 CFR 50, Appendix A, GDC 17.

2.

Regulatory Guide 1.6.

3.

IEEE Standard 308-1971.

4.

FSAR, Section 8.5.

5.

FSAR, Chapters 5 and 6.

6.

UntF SAR, Chapter 154.

7.

Regulatory Guide 1.93, December 1974.

8.

IEEE Standard 450-20021-98-7.

9.

Technical Requirements Manual, Section 9.0.

10.

Regulatory Guide 1.32, February 1977.

11.

Not used.

12.

IEEE Standard 485-1983.

13.

NRC No. 93-1 02, "Final Policy Statement on Technical Specification Improvements," July 23, 1993.

14.

Not used. HATCH UNIT 1 B386 EIIN6 B 3.8-69 REVISION 69

DC Sources - Operating B 3.8.4 B 3.8 ELECTRICAL POWER SYSTEMS B 3.8.4 DC Sources - Operating BASES BACKGROUND The DC electrical power system provides the AC emergency power system with control power. It also provides both motive and control power to selected safety related equipment. As required by 10 CFR 50, Appendix A, 000 17 (Ref. 1), the DC electrical power system is designed to have sufficient independence, redundancy, and testability to Perform its safety functions, assuming a single failure. The DC electrical power system also conforms to the recommendations of Regulatory Guide 1.6 (Ref. 2) and IEEE-308 (Ref. 3). The station service DC power sources provide both motive and control power to selected safety related and nonsafety related equipment. Each DC subsystem is energized by one 125/250 V station service battery (consisting of two 125 V batteries in series__. and three 125 V battery chargers (two normally inservice chargers and one standby charger). Each battery is exclusively associated with a single 125/250 VDC bus. Each set of battery chargers exclusively associated with a 125/250 VDC subsystem cannot be interconnected with any other 125/250 VDC subsystem. The normal and backup chargers are supplied from the same AC load groups for which the associated DC subsystem supplies the control power. The loads between the redundant 125/250 VDC subsystem are not transferable except for the Automatic Depressurization System, the logic circuits and valves of which are normally fed from the Division 1 DC system. The diesel generator (DG) DC power sources provide control and instrumentation power for their respective DG and their respective offsite circuit supply breakers. In addition, DG 2A power source provides circuit breaker control power for the respective Division I loads on 4160 VAC buses 2E and 2F, and DG 2C power source provides circuit breaker control power for the respective Division II loads on 4160 VAC buses 2F and 2G. Each DG DC subsystem is energized by one 125 V battery and two 125 V battery chargers (one normally inservice charger and one standby charger). During normal operation, the DC loads are powered from the respective station service and DG battery chargers with the batteries floating on the system. ln case of loss of normal power to any battery charger, the DC loads are automatically powered from the associated battery. This will (continued) HATCH UNIT 2 B 3.8-52 REVISION 39

DC Sources - Operating B 3.8.4 BASES BACKGROUND result in the discharging of the associated battery (and affect the (continued) battery cell parameters). The DC power distribution system is described in more detail in Bases for LCO 3.8.7, "Distribution System - Operating," and LCO 3.8.8, Distribution System - Shutdown." Eac...°h, battery has.. adqut storag.. capacity to. cay .th requird..oa continuou,,sly* for approxvimate-ly-*h 2 hor., (Ref. 1)-.F I Each DC battery subsystem is separately housed in a ventilated room apart from its charger and distribution panels. Each subsystem is located in an area separated physically and electrically from the other subsystems to ensure that a single failure in one subsystem does not cause a failure in a redundant subsystem. There is no sharing between redundant Class 1 E subsystems such as batteries, battery chargers, or distribution panels. Each battery has adequate storaae capacity to meet the duty cycle(s) discussed in the FSAR. Chapter 8 (Ref 4). The batter, is designed with additional caoacitv above that required by the design duty cycle to allow for temperature variations and other factors. The batteries for DC electrical power subsystems are sized to produce required capacity at 80% of nameplate rating, corresponding to warranted capacity at end of life. The minimum design voltage limit is 105/210 V. The battery cells are of flooded lead acid construction with a nominal specific gravity of 1.215. This specific gravity corresponds to an open circuit battery voltage of approximately 124 V for a 60 cell battery (i.e.. cell voltage of 2.07 volts per cell (Vpc)). The open circuit voltage is the voltage maintained when there is no charging or discharging. Once fully charged with its open circuit voltaae > 2.07 Vpc. the battery cell will maintain its capacity for 30 days without further charging per manufacturer's instructions. Optimal long term performance however. is obtained by maintaining a float voltage 2.20 to 2.25 Vpc. This provides adequate over-potential, which limits the formation of lead sulfate and self discharge. The nominal float voltage of 2.20 Vpc corresponds to a total float voltage output of 132 V for a 60 cell battery as discussed in the FSAR. Chapter 8 (Ref. 4). Each battery charger of the DC electrical power subsystem has ample power output capacity for the steady state operation of connected loads required during normal operation, while at the same time maintaining a fully charged battery. Each battery charger has sufficient excess capacity to restore the battery from the design (continued) HATCH UNIT 2 B385 EIIN3 B 3.8-53 REVISION 39

DC Sources - Operating B 3.8.4 minimum charge to its fully charged state within 24 hours while supplying normal steady state loads (Ref. 4). The battery charger is normally in the float-charge mode. Float-charge is the condition in which the charaer is supplying the connected loads and the battery cells are receiving adequate current to optimally charae the battery. This assures the internal losses of a battery are overcome and the battery is maintained in a fully charged state. When desired. the charoer can be placed in the equalize mode. The egualize mode is at a higher voltage than the float mode and charging current is correspondingly higher. The battery charger is operated in the egualize mode after a battery discharge or for routine maintenance. Following a battery discharge. the battery recharae characteristic accepts current at the current limit of the battery charger (if the discharge was significant. e.g.. following a battery service test) until the battery terminal voltaae approaches the charger voltage setpoint. Charging current then reduces exponentially during the remainder of the recharoe cycle. Lead-calcium batteries have recharge efficiencies of greater than 95%. so once at least 105% of the ampere-hours discharged have been returned, the battery capacity would be restored to the same condition as it was prior to the discharge. This can be monitored by direct observation of the exponentially decaying charging current or by evaluating the amp-hours discharged from the battery and amp-hours returned to the battery. A description of the Unit 1 DC power sources is provided in the Bases for Unit 1 LCO 3.8.4, "DC Sources - Operating." APPLICABLE SAFETY ANALYSES The initial conditions of Design Basis Accident (OBA) and transient analyses in the FSAR, Chapter 6 (Ref. 5), and Chapter 15 (Ref. 6), assume that Engineered Safety Feature (ESF) systems are OPERABLE. The DC electrical power system provides normal and emergency DC electrical power for the DGs, emergency auxiliaries, and control and switching during all MODES of operation. The OPERABILITY of the DC subsystems is consistent with the initial assumptions of the accident analyses and is based upon meeting the design basis of the unit. This includes maintaining DC sources OPERABLE during accident conditions in the event of: (continued) HATCH UNIT 2 B 3.8-54 REVISION 39 B 3.8-54 REVISION 39

DC Sources - Operating B 3.8.4 BASES APPLICABLE

a.

An assumed loss of all offsite AC power sources or all onsite SAFETY ANALYSES AC power sources; and (continued)

b.

A postulated worst case single failure. The DC sources satisfy Criterion 3 of the NRC Policy Statement (Ref. 13). LCO The Unit 2 DC electrical power subsystems --with: 1) each station service DC subsystem consisting of one 125/250 V station service batter, (two 125 V batteries in series)=, two battery chargers, and the corresponding control equipment and interconnecting cabling supplying power to the associated bus; and 2) each DG DC subsystem consisting of one battery bank, one battery charger, and the corresponding control equipment and interconnecting cabling -- are required to be OPERABLE to ensure the availability of the required power to shut down the reactor and maintain it in a safe condition after an anticipated operational occurrence (AOO) or a postulated DBA. In addition, some components required by Unit 2 require power from Unit 1 sources (e.g., Standby Gas Treatment (SGT) System, Low Pressure Coolant Injection (LPCI) valve load centers, Main Control Room Environmental Control (MOREC) System, and Control Room Air Condition (AC) System). Therefore, the Unit 1 DG DC and the swing DG DC electrical power subsystems needed to provide DC power to the required Unit 1 components are also required to be OPERABLE. Thus, loss of any DC electrical power subsystem does not prevent the minimum safety function from being performed (Ref. 4). APPLICABILITY The DC electrical power sources are required to be OPERABLE in MODES 1, 2, and 3 to ensure safe unit operation and to ensure that:

a.

Acceptable fuel design limits and reactor coolant pressure boundary limits are not exceeded as a result of AOOs or abnormal transients; and

b.

Adequate core cooling is provided, and containment integrity and other vital functions are maintained in the event of a postulated DBA. The DC electrical power requirements for MODES 4 and 5, and other conditions in which DC Sources are required, are addressed in the Bases for LCO 3.8.5, "DC Sources - Shutdown." (continued) HATCH UNIT 2 B385 EIIN3 B3.8-55 REVISION 39

DC Sources - Operating B 3.8.4 BASES (continued) ACTIONS A.1 If one or more of the required Unit 1 DG DC electrical power subsystems is inoperable (e.g., inoperable battery, inoperable battery charger(s), or inoperable battery charger and associated inoperable battery), or if the swing DG DC electrical power subsystem is inoperable due to performance of SR 3.8.4.37; or SR 3.8.6.64.8, and a loss of function has not occurred as described in Condition E-H, the remaining DC electrical power subsystems have the capacity to support a safe shutdown and to mitigate an accident condition. In the case of an inoperable required Unit 1 DG DC electrical power subsystem, continued power operation should not exceed 7 days since a subsequent postulated worst case single failure could result in the loss of certain safety functions (e.g., SGT System and LPCI valve load centers). The 7 day Completion Time takes into account the capacity and capability of the remaining DC sources, and is based on the shortest restoration time allowed for the systems affected by the inoperable DC source in the respective system Specification. In the case of an inoperable swing OG DC electrical power subsystem, since a subsequent postulated worst case single failure could result in the loss of minimum necessary DC electrical subsystems to mitigate a postulated worst case accident, continued power operation should also not exceed 7 days. The 7 day Completion Time is based upon the swing DG DC electrical power subsystem being inoperable due to performance of SR 3.8.4.37 or SR 3.8.6.64=8. Performance of these two SRs will result in inoperability of the DC battery. Since this battery is common to both units, more time is provided to restore the battery, if the battery is inoperable for performance of required Surveillances, to preclude the need to perform a dual unit shutdown to perform these Surveillances. The swing DG DC electrical power subsystem also does not provide power to the same type of equipment as the other DG D)C sources (e.g., breaker control power for 4160 V loads is not provided by the swing DG battery). The Completion Time also takes into account the capacity and capability of the remaining DC sources. B.1, B.2. and B.3 Condition B reoresents one Unit 2 DG DC subsystem with a required battery charger inoperable (e.g.. the voltaoe limit of SR 3.8.4.1 is not maintained), or the swing DG DC subsystem with a required battery charger inooerable for reasons other than Condition A. The ACTIONS provide a tiered response that focuses on returning the battery to the fully charged state and restoring a fully qualified charger to OPERABLE status in a reasonable time period. Required Action B.1 requires that the battery terminal voltage be restored to oreater (continued) HATCH UNIT 2 B385 EIIN3 B 3.8-56 REVISION 39

DC Sources - Operating B 3.8.4 than or equal to the minimum established float voltaqe within 2 hours. This time provides for returning the inoperable charger to OPERABLE status or providing an alternate means of restoring battery terminal voltage to greater than or eqaual to the minimum established float voltage. Restoring the battery terminal voltage to greater than or eoual to the minimum established float voltage provides good assurance that. within 12 hours. the battery will be restored to its fully charged condition (Required Action B.2) from any discharge that might have occurred due to the charger inoperability. A discharged battery having terminal voltage of at least the minimum established float voltage indicates that the battery is on the exponential charging current portion (the second part) of its recharoe cycle. The time to return a battery to its fully charged state under this condition is simply a function of the amount of the previous discharge and the recharge characteristic of the battery. Thus there is good assurance of fully recharging the battery within 12 hours. avoiding a premature shutdown with its own attendant risk. If established battery terminal float voltaae cannot be restored to greater than or equal to the minimum established float voltaae within 2 hours. and the charger is not operating in the current-limiting mode, a faulty charaer is indicated. A faulty charger that is incapable of maintaining established battery terminal float voltage does not provide assurance that it can revert to and operate properly in the current limit mode that is necessary during the recovery period following a battery discharge event that the DC system is designed for. If the charger is operating in the current limit mode after 2 hours. that is an indication that the battery is partially discharged and its capacity margins will be reduced. The time to return the battery to its fully charged condition in this case is a function of the battery charger capacity, the amount of loads on the associated DC system, the amount of the previous discharge, and the recharae characteristic of the battery. The charge time can be extensive, and there is not adequate assurance that it can be recharged within 12 hours (Reguired Action B.2). Reguired Action B.2 requires that the battery float current be verified as less than or equal to 5 amps. This indicates that. if the battery had been discharged as the result of the inoperable battery charger, it is now fully capable of supplying the maximum expected load requirement. The 5 amp value is based on returning the battery to 95% charae and assumes a 5% design margin for the battery. If at the expiration of the initial 12 hour period the battery float current is not less than or equal to 5 amps this indicates there may be additional battery problems and the battery must be declared inoperable. Reguired Action B.3 limits the restoration time for the inoperable (continued) HATCH UNIT 2 B385 EIIN3 B 3.8-57 REVISION 39

DC Sources - Operating B 3.8.4 b~attery charoer to 72 hours. This action is applicable if an alternate .means of restoring battery, terminal voltaae to areater than or equal to the minimum established float voltage has been used (e.g.. balance of plant non-Class 1 E battery charger). The 72 hour Completion Time reflects a reasonable time to effect restoration of the gualified battery -charaer to OPERABLE status. If a Unit 2 DG DC electrical power subsystem is inoperable for reasons other than Condition B. or if the swing DG DC electric power subsystem is inoperable for reasons other than Condition A or B. (e.g. i~n.operable battery or inoperable battery charger and associated inooperable battery'), the remaining DC electrical power subsystems have the capacity to support a safe shutdown and to mitigate an accident condition. Since a subsequent postulated worst case single failure could result in the loss of minimum necessary DC electrical subsystems to mitigate a postulated worst (continued) HATCH UNIT 2 B385 EIIN3 B3.8-58 REVISION 39

DC Sources - Operating B 3.8.4 BASES ACTIONS BC.1 (continued) case accident, continued power operation should not exceed 12 hours. The 12 hour Completion Time provides a period of time to correct the problem commensurate with the importance of maintaining the OG DC electrical power subsystem OPERABLE. (The DG DC electrical power subsystem affects both the DG and the offsite circuit, as well as the breaker closure power for various 4160 V AC loads, but does not affect 125/250 V DC station service loads.) D.1. D.2. and D.3 Condition D represents one Unit 2 station service DC subsystem with one or more required battery chargers inoperable (e.g.. the voltage limit of SR 3.8.4.1 is not maintained). The ACTIONS provide a tiered response that focuses on returning the battery to the fully charged state and restoring a fully qualified charqer to OPERABLE status in a reasonable time period. Required Action D.1 requires that the battery terminal voltage be restored to greater than or equal to the minimum established float voltage within 2 hours. This time provides for returning the inoperable charger to OPERABLE status or providing an alternate means of restoring battery terminal voltage to greater than or eaual to the minimum established float voltage. Restoring the battery terminal voltage to greater than or equal to the minimum established float voltage provides good assurance that, within 12 hours. the battery will be restored to its fully charoed condition (Required Action D.2) from any discharge that might have occurred due to the charger inoperability. A discharged battery having terminal voltage of at least the minimum established float voltaoe indicates that the battery is on the exponential charging current portion (the second part) of its recharge cycle. The time to return a battery to its fully charged state under this condition is simply a function of the amount of the previous discharge and the recharge characteristic of the battery. Thus there is good assurance of fully recharging the battery within 12 hours. avoiding a premature shutdown with its own attendant risk. If established battery terminal float voltage cannot be restored to greater than or eaual to the minimum established float voltage within 2 hours. and the charoer is not operating in the current-limiting mode. a faulty charoer is indicated. A faulty charger that is incapable of maintaining established battery terminal float voltage does not provide assurance that it can revert to and operate properly in the current limit mode that is necessary during the recovery period following a battery discharge event that the DC system is designed for. (continued) HATCH UNIT 2 B385 EIIN3 B3.8-59 REVISION 39

DC Sources - Operating B 3.8.4 If the charaer is operating in the current limit mode after 2 hours, that is an indication that the battery is partially discharqed and its capacity margins will be reduced. The time to return the battery to its fully charged condition in this case is a function of the battery charaer capacity. the amount of loads on the associated DC system. the amount of the previous discharge, and the recharae characteristic of the battery. The charae time can be extensive. and there is not adequate assurance that it can be recharoed within 12 hours (Reguired Action D.2). Reguired Action 0.2 reguires that the battery float current be verified as less than or equal to 20 amps. This indicates that. if the battery had been discharged as the result of the inoperable battery charger, it is now fully capable of supplying the maximum expected load reguirement. The 20 amp value is based on returning the battery to 95% charae and assumes a 5% design margin for the battery. If at the expiration of the initial 12 hour period the battery float current is not less than or equal to 20 amps this indicates there may be additional battery problems and the battery must be declared inoperable. Reguired Action D.3 limits the restoration time for the inoperable battery charaer to 72 hours. This action is applicable if an alternate means of restoring battery terminal voltage to greater than or equal to the minimum established float voltage has been used (e.g.. balance of plant non-Class 1 E battery charger). The 72 hour Completion Time reflects a reasonable time to effect restoration of the gualified battery to OPERABLE status. E.1 Condition E represents one Unit 2 station service DC subsystem with one battery inoperable. With one battery inoperable, the station service DC bus is being supplied by the OPERABLE battery chargers. Any event' that results in a loss of the AC bus supporting the battery chargers will also result in loss of DC to that subsystem. The energization transients of any DC loads that are beyond the capability of the battery chargers and normally reguire the assistance of the battery will not be able to be brought online. The 12 hour limit allows sufficient time to effect restoration of an inoperable battery given that the maiority of the conditions that lead to battery inoperabilitv (e.g.. loss of battery charger. battery cell voltaae less than or equal to 2.07 V. etc.) are identified in Specifications 3.8.4. 3.8.5. and 3.8.6 together with additional specific completion times. GE.1 Condition G-F represents one Unit 2 station servicedsir subsystem with a loss of ability to completely respond to an event, (continued) HATCH UNIT 2 B386 EIIN3 B 3.8-60 REVISION 39

DC Sources - Operating B 3.8.4 and a potential loss of ability to remain energized during normal operation. It is therefore imperative that the operator's attention focus on stabilizing the unit, minimizing the potential for complete loss of DC power to the affected d-vsie~isubsystem. The 2 hour limit is consistent with the allowed time for an inoperable DC Distribution System *vii~usstem. If one of the required Unit 2 station service DC electrical power subsystems is inoperable for reasons other Conditions D or E (e.g., inpcprablc battery, inoperablebtery*ho** charger s,

• w" or, inoperable battery charger and associated inoperable battery), the remaining DC electrical power subsystems hasve the capacity to support a safe shutdown and to mitigate an accident condition. Since a subsequent postulated worst case single failure could result in the loss of minimum necessary DC electrical subsystems to mitigate a postulated worst case accident, continued power operation should not exceed 2 hours. The 2 hour Completion Time is based on Regulatory Guide 1.93 (Ref. 7) and reflects a reasonable time to assess unit status as a function of the inoperable DC electrical power subsystem and, if the DC electrical power subsystem is not restored to OPERABLE status, to prepare to effect an orderly and safe unit shutdown.

DG.1 and DG.2 If the DC electrical power subsystem cannot be restored to OPERABLE status within the required Completion Time, the unit must be brought to a MODE in which the LCO does not apply. To achieve this status, the unit must be brought to at least MODE 3 within 12 hours and to MODE 4 within 36 hours. The allowed Completion Times are reasonable, based on operating experience, to reach the required plant conditions from full power conditions in an orderly manner and without challenging plant systems. The Completion Time (continued) HATCH UNIT 2 B386 EIIN3 B 3.8-61 REVISION 39

DC Sources - Operating B 3.8.4 BASES ACTIONS DG.1 and DG.2 (continued) to bring the unit to MODE 4 is consistent with the time required in Regulatory Guide 1.93 (Ref. 7). EH.1 Condition E--Hcorresponds to a level of degradation in the DC electrical power subsystems that causes a required safety function to be lost. When more than one DC source is lost, and this results in the loss of a required function, the plant is in a condition outside the accident analysis. Therefore, no additional time is justified for continued operation. LCO 3.0.3 must be entered immediately to commence a controlled shutdown. SURVEILLANCE The SRs are modified by a NOTE to indicate that SR 3.8.4.1 through REQUIREMENTS SR 3.8.4.8-3_apply only to the Unit 2 DC sources, and that SR 3.8.4.8 4applies only to the Unit 1 DC sources. SR 3.8.4.1 Verifying battery terminal voltage while on float charge for the batteries helps to ensure the effectiveness of the c"harging.* system a.nd4. t** he *÷, ablif thc, battoriec, to, perferm thci* intended*,, function battery chargers, which support the ability of the batteries to perform their intended function. Float charge is the condition in which the charger is supplying the continuous charge required to overcome the internal losses of a battery (eir-bat*-eland maintain the battery (eira bteyeI}in a fully charged state while supplving the continuous steady state loads of the associated DC subsystem. On float charge. battery cells will receive adeauate current to optimally charge the battery. The voltaae reguirements are based on the nominal design voltage of the battery and are consistent with the minimum float voltage established by the battery manufacturer (2.20 Vpc times the number of connected cells). For example. if 60 cells are connected. the voltage at the battery terminals would be 132 V. 2.20 Vpc times 60 cells. With only 58 connected cells. the terminal voltage would be 127.6 V. This voltage maintains the battery, plates in a condition that supports maintaining the grid life. Voltage requ-iroments arc based on the nominal design-,r voltage ofl 1,h,- batter÷.... and -,arc..

cnistent w^ith-the in;itil (continued)

HATCH UNIT 2 B3.8-62 REVISION 79

DC Sources - Operating B 3.8.4 voltagc of "lea calcium.*.. cell. of nominal.;.o 1 =.... scfie gr.t....;, Without regard to other bater parameters,,, this.oltag iso* indicative-of*.. a battery that* is capabl o" f pedorming ;ts required sa*fety funcio.. ;, The Surveillance Frequency is controlled under the Surveillance Frequency Control Program. SR-&.9'!.2 Visual inspection to detect corrosion of the batter' cells and t, e~r'ti,-~.-, ~' f~ r m ~ ~i I ic4o r~ r~f ~a ~bJilr.r~1L ] (continued) HATCH UNIT 2 B386 EIIN7 B 3.8-63 REVISION 79

DC Sources - Operating B 3.8.4 B]ASES SURVEILLANCE REQUIREMENTS SR,3.8.1.2 (cntinucd),rl inter* rack,- inter_;r te,- and te*rmina;*l connection,t p;rovides;.4 an. indcation-J;,- of* phy,,*"Sical* d'amagec or abnormal deeioration*.÷;,* thaoul potentially*,,+oU, overall voltag*e drop across the, batter; and. t4he, possibility÷, of. batter' Frequency...... Control Program. SR-3.8.4.3 Visual inspection of the, batter;*, cell, cel plates,÷. and. batter racks. u p-rovides an l'Iindicatin of physica'l da'maen or" abnormal deteriorat'*ion The Sur'-eillance Frequency.. is conrole under,..*,*, the S....eilla... SR 3.8.1.1 and SR 3.8.1!.5 Visual inspection and resistance measu-rements of inter-cell, of p-hysica,',l damagen or" abnorma*l deter,*iorat*ion tIhat coul,iHndicate degradedem batte*rrv'of condiion The.. anti corrosion matria is-used to.... (continued) HATCH UNIT 2 B386 EIIN7 [] 3.8-64 REVISION 79

DC Sources - Operating B 3.8.4 BASES SURVEILLANCE SR 3.8.1.4 and, SR 3.81. (continued) ...,4 REQUIREMENTS Th cnrnec~nnt'ion, resistance limtsare established t mn.ha in tainltvdT h ovrllvltg dro acos theI-bater and. the,- pos-,,-ibilit,, of, batteryu da~mage due to' heating of' conecton. n The, resistance value for each batter÷y connnect;,n ae*' l'cr'lated in ÷the Technicl Reou irement*÷* The Su-,"eillance Frequency is controlled under the Surveillance Frequency Control Progra m. SR 3.8.4.62 This SR verifies Batte...r' charger. capailit requirements *ar bae on the design capacity of the battery chargers-(Ref-4. According to Regulatory Guide 1.32 (Ref. 10), each battery charger supply is ,-.h,,ed-*recommended to be based on the largest combined demands of the various steady state loads and the charging capacity to restore the battery from the design minimum charge state to the fully charged state, irrespective of the status of the unit during these demand occurrences. The minimum required amperes and duration ensures that these requirements can be satisfied. This SR provides two options. One option requires that each battery .charger be capable of supplying -> 400 amps for the station service subsystems and >- 100 amps for the DG subsystems at the minimum .established float voltage for 1 hour. The ampere requirements are based on the output ratinq of the chargers. The voltaoe requirements are based on the charoer voltaae level after a response to a loss of AC power. The other option requires that each battery charger be capable of recharqinq the battery after a service test coincident with supplvinq the largest coincident demands of the various continuous steady state loads (irrespective of the status of the plant during which these demands occur). This level of loading may not normally be available following the battery service test and will need to be supplemented with additional loads. The duration for this test may be longer than the charaer sizing criteria since the battery recharge is affected by float voltage, temperature. and the exponential decay in charging current. The battery is recharaed when the measured charging current is < 20 amps for the station service battery and < 5 amps for the DG batteries. (continued) HATCH UNIT 2 B386 EIIN7 B3.8-65 REVISION 79

DC Sources - Operating B 3.8.4 The Surveillance Frequency is controlled under the Surveillance Frequency Control Program. SR 3.8.4.:73 A battery service test is a special test of the battery's capability, as found, to satisfy the design requirements (battery duty cycle) of the DC electrical power system. The discharge rate and test length corresponds to the design duty cycle requirements as specified in Reference 4. The Surveillance Frequency is controlled under the Surveillance Frequency Control Program. This SR is modified by two Notes. Note 1 allows the performance of a modified performance discharge test in lieu of a service test. (continued) HATCH UNIT 2 B386 EIIN7 B 3.8-66 REVISION 79

DC Sources - Operating B 3.8.4 BASES SURVEILLANCE SR 3.8.4.7--3k(contin ued) REQUIREMENTS consis"'ting of° just two ratcs th -e. 1 miut ratc pubiscdfo the battery..

• o

÷or thc,, largcs curn loa of. the duty* cycle folloedr b thela testrate employedf for h eformance.. test., both +,of which enveopethedut cyce f hesevie.es...Since= the ameraousreoedyarate 1hinute dshag r epresentho,',~ a*nl very sma;ll p0fa Won'*' ofthe batten'l cpcTy, thr e sto fraNte ca be changpedtormn that forvteilpnerformncl ts wirthurbth comptroiingl ditheresultsiof sythem pefomacedichargengtest.t ThreianeThswnDGC battery triavotgfothmdfied emptedforomac dhiscag testrishould reminc above theq miimum b bahntte' termin.4ald volageob specifired in the battery sreqiced tetyo the durationhoof timelequalito that ofith sehucetestn.

• A'- -,*

modife eformnd dichrg test.. is. a.. test of the battery capacity highst rate o of A 7thedut cyle)-his wiloften, confirmlna t;ohe batte/sof modi**AfiedA performance disc*hag test shoul be idcentiale to th. ose-TheTreasoNfor Not 2.-6 istaRefrig h uvilnEVwOuld 9

DC Sources - Operating B 3.8.4 BASES SURVEILLANCE SR 3.8.1.8 (cont÷;.. ed)4 REQUIREMENTS may.., bc*, used*, to-satisf,, SR .8.1.,I whl satisfyingo*,, the, req-uirements of SR3.8..7 a thesametime The acceptance criteria for this Su-r-eillance is consistent with IEEE manfaturero's rhating. Altough ÷,there .,.4 may beaml cpitye the batter rate of deemterioraton is;* rapidlyicreasing.;÷;" euie " '** Wth he exetoofhs SurveillanceFeuec iaonrlle unerther Surveillances fti This SR is modifiedsyaNt. ThiSuelane reso fprovthed Nte disec thatth aperoprmingthe Surveillances woul rheme a qureqUnired DC eleuricsare powernesubsysthem from sechnic, Specifihecatricas. distoribtanceoh unplianned eUnits thtstifh Surveillance. ilsaif bthe swi ngt 1G reunits'meCn3t8, and elanntb periformedthin Unth manerqure.b The Foteqwithou resulingd in ah dapl uital hUton.t1S ls oen With theaecepto of thi Su frveillaUnceiltohrusilacsofti Specfictio (S 3.84.1thrughSR.8.48~)areappiedonlytothed HATCH UNIT 2 B386 EIIN7 B3.8-68 REVISION 79

DC Sources - Operating ,B 3.8.4 BASES (continued) REFERENCES 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 10 CFR 50, Appendix A, GDC 17. Regulatory Guide 1.6. IEEE Standard 308-1971. FSAR, Paragraphs 8.3.2.1.1 and 8.3.2.1.2. ESAR, Chapter 6. FSAR, Chapter 15. Regulatory Guide 1.93, December 1974. IEEE Standard 450-2002-1-98-7-. Technical Requirements Manual, Section 9.0. Regulatory Guide 1.32, February 1977. Not used IEEE Standard 485-1983. NRC No. 93-102, "Final Policy Statement on Technical Specification Improvements,' July 23, 1993. HATCH UNIT 2 B386 EIIN7 B 3.8-69 REVISION 79

DC Sources - Shutdown B 3.8.5 B 3.8 ELECTRICAL POWER SYSTEMS B 3.8.5 DC Sources - Shutdown BASES BACKGROUND A description of the DC sources is provided in the Bases for LCO 3.8.4, "DC Sources - Operating." APPLICABLE SAFETY ANALYSES The initial conditions of Design Basis Accident and transient analyses in the FSAR, Chapters 5 and 6 (Ref. 1), and Unit 2 ESAR Chapter 154 (Ref. 2), assume that Engineered Safety Feature systems are OPERABLE. The DC electrical power system provides normal and emergency DC electrical power for the diesel generators (DGs), emergency auxiliaries, and control and switching during all MODES of operation. The OPERABILITY of the DC subsystems is consistent with the initial assumptions of the accident analyses and the requirements for the, supported systems' OPERABILITY. The OPERABILITY of the minimum DC electrical power sources during MODES 4 and 5 and during movement of irradiated fuel assemblies in the secondary containment ensures that:

a.

The facility can be maintained in the shutdown or refueling condition for extended periods;

b.

Sufficient instrumentation and control capability is available for monitoring and maintaining the unit status; and

c.

Adequate DC electrical power is provided to mitigate events postulated during shutdown, such as an inadvertent draindown of the vessel or a fuel handling accident. The DC sources satisfy Criterion 3 of the NRC Policy Statement (Ref. 3). LCO The necessary Unit 1 DC electrical power subsystems -- with:

1) each station service DC subsystem consisting of one 125/250 V station service battery (consisting of two 125 V batteries in series)=, two battery chargers, and the corresponding control equipment and interconnecting cabling; and

2) each DG DC subsystem consisting of one battery bank, one battery charger, and (continued)

HATCH UNIT 1 B3.8-63 REVISION 33

DC Sources - Shutdown B 3.8.5 BASES LCO (continued) the corresponding control equipment and interconnecting cabling -- are required to be OPERABLE to support required DC distribution subsystems required OPERABLE by LCO 3.8.8, "Distribution Systems - Shutdown." In addition, some components that may be required by Unit 1 require power from Unit 2 sources (e.g., Standby Gas Treatment (SGT) System and LPCI valve load centers). Therefore, the Unit 2 DG DC and the swing DG DC electrical power subsystems needed to provide DC power to the required Unit 2 components are also required to be OPERABLE. This requirement ensures the availability of sufficient DC electrical power sources to operate the unit in a safe manner and to mitigate the consequences of postulated events during shutdown (e.g., fuel handling accidents and inadvertent reactor vessel draindown). APPLICABILITY The DC electrical power sources required to be OPERABLE in MODES 4 and 5 and during movement of irradiated fuel assemblies in the secondary containment provide assurance that:

a.

Required features to provide adequate coolant inventory makeup are available for the irradiated fuel assemblies in the core in case of an inadvertent draindown of the reactor vessel;

b.

Required features needed to mitigate a fuel handling accident are available;

c.

Required features necessary to mitigate the effects of events that can lead to core damage during shutdown are available; and

d.

Instrumentation and control capability is available for monitoring and maintaining the unit in a cold shutdown condition or refueling condition. The DC electrical power requirements for MODES 1, 2, and 3 are covered in LCO 3.8.4. ACTIONS A.1. A.2.!. A.2.2. A.2.3, and A.2.4A.2. A.3, B.1, B.2. B.3 Conditions A and B represent one or more (Condition A), or one (Condition B). required subsystem with one or more required battery chargers inoperable (e.g.. the voltage limit of SR 3.8.4.1 is not maintained). The ACTIONS provide a tiered response that focuses on returning the battery to the fully charged state and restoring a fully (continued) HATCH UNIT 1 B 3.8-64 REVISION 33

DC Sources - Shutdown B 3.8.5 qualified charger to OPERABLE status in a reasonable time period. Required Action A.1IB.1 requires that the battery terminal voltage be restored to greater than or equal to the minimum established float voltage within 2 hours. This time provides for returninq the inoperable .charger to OPERABLE status or providinq an alternate means of restorinq battery terminal voltaae to areater than or equal to the minimum established float voltaqe. Restorinq the battery terminal voltage to areater than or equal to the minimum established float voltaqe provides aood assurance that. within 12 hours. the battery will be restored to its fully charged condition (Required Action A.2/B.2) from any discharqe that miqht have occurred due to the charger inoperability. A discharqed battery havinq terminal voltage of at least the minimum established float voltage indicates that the battery is on the_ exponential charqinq current portion (the second part) of its recharae .cycle. The time to return a battery to its fully charged state under this condition is simply a function of the amount of the previous discharqe and the recharge characteristic of the battery.. Thus there is aood assurance of fully recharqinq the battery within 12 hours. avoidinq a premature shutdown with its own attendant risk. If established battery, terminal float voltage cannot be restored to greater than or equal to the minimum established float voltage within 2 hours. and the charger is not operatinq in the current-limitinq mode. a faulty charger is indicated. A faulty charger that is incapable of maintaining established battery terminal float voltage does not provide assurance that it can revert to and operate properly in the current limit mode that is necessary durinq the recovery period following a battery discharqe event that the DC system is desiqned for. If the charaer is operatinq in the current limit mode after 2 hours that is an indication that the battery is partially discharqed and its capacity marqins will be reduced. The time to return the battery to its fully charaed condition in this case is a function of the battery charaer capacity. the amount of loads on the associated DC system. the amount of the previous discharqe. and the recharae characteristic of the battery. The charae time can be extensive. and there is not adequate assurance that it can be recharaed within 12 hours (Required Action A.2/B.2). Required Action A.2/B.2 requires that the battery float current be 'erified as less than or equal to 20 amps for the station service battery or 5 amps for the DG battery. This indicates that. if the battery had been discharqed as the result of the inoperable battery charqer. it has now been fully recharqed. If at the expiration of the initial 12 hour period the battery float current is not less than or equal to 20 amps for the station service battery or 5 amos for the DG battery this indicates there may be additional battery problems and the battery must be declared inoperable. (continued) HATCH UNIT 1 B386 EIIN3 B 3.8-65 REVISION 33

DC Sources - Shutdown B 3.8.5 Required Action A.3/B.3 limits the restoration time for the inoperable battery charaer to 72 hours. This action is applicable if an alternate means of restoring battery terminal voltage to areater than or equal to the minimum established float voltage has been used (e.g.. balance of plant non-Class 1 E battery charger). The 72 hour Completion Time reflects a reasonable time to effect restoration of the gualified battery charaer to OPERABLE status. C.1, 0.2.1,.C.2.2,.C.2.3. and 0.2.4 If more than one DC distribution subsystem is required according to LCO 3.8.8, the DC subsystems remaining OPERABLE with one or more DC power sources inoperable may be capable of supporting sufficient required features to allow continuation of CORE (continued) HATCH UNIT 1 B 3.8-66 REVISION 33

DC Sources - Shutdown B 3.8.5 BASES ACTIONS 0.1. C.2.1.0C.2.2,.C.2.3. and C.2.4A.!. A.2.!. A.2.2. A.2.3, and A.2.1 (continued) ALTERATIONS, fuel movement, and operations with a potential for draining the reactor vessel. By allowance of the option to declare required features inoperable with associated DC power sources inoperable, appropriate restrictions are implemented in accordance with the affected system LOOs' ACTIONS. In many instances, this option may involve undesired administrative efforts. Therefore, the allowance for sufficiently conservative actions is made (i.e., to suspend CORE ALTERATIONS, movement of irradiated fuel assemblies in the secondary containment, and any activities that could result in inadvertent draining of the reactor vessel). Suspension of these activities shall not preclude completion of actions to establish a safe conservative condition. These actions minimize the probability of the occurrence of postulated events. It is further required to immediately initiate action to restore the required DC electrical power subsystems and to continue this action until restoration is accomplished in order to provide the necessary DC electrical power to the plant safety systems. The Completion Time of immediately is consistent with the required times for actions requiring prompt attention. The restoration of the required DC electrical power subsystems should be completed as quickly as possible in order to minimize the time during which the plant safety systems may be without sufficient power. SURVEILLANCE SR 3.8.5.1 REQUIREMENTS SR 3.8.5.1 requires performance of all Surveillances required by SR 3.8.4.1 through SR 3.8.4.83_. Therefore, see the corresponding Bases for LCO 3.8.4 for a discussion of each SR. This SR is modified by a Note. The reason for the Note is to preclude requiring the OPERABLE DC sources from being discharged below their capability to provide the required power supply or otherwise rendered inoperable during the performance of SRs. It is the intent that these SRs must still be capable of being met, but actual performance is not required. SR 3.8.5.2 This Surveillance is provided to direct that the appropriate Surveillances for the required Unit 2 DC sources are governed by the (continued) HATCH UNIT 1 B3.8-67 REVISION 33

DC Sources - Shutdown B 3.8.5 BASES SURVEILLANCE SR 3.8.5.2 (continued) REQUIREMENTS Unit 2 Technical Specifications. Performance of the applicable Unit 2 Surveillances will satisfy both any Unit 2 requirements, as well as satisfying this Unit 1 Surveillance Requirement. The Frequency required by the applicable Unit 2 SR also governs performance of that SR for both Units. REFERENCES

1.

FSAR, Chapters 5 and 6.

2.

Unit 2 FSAR, Chapter 15=4.

3.

NRC No. 93-102, "Final Policy Statement on Technical Specification Improvements," July 23, 1993. HATCH UNIT 1 B386 EIIN3 B 3.8-68 REVISION 33

DC Sources - Shutdown B 3.8.5 B 3.8 ELECTRICAL POWER SYSTEMS B 3.8.5 DC Sources - Shutdown BASES BACKGROUND A description of the DC sources is provided in the Bases for LCO 3.8.4, "DC Sources - Operating." APPLICABLE SAFETY ANALYSES The initial conditions of Design Basis Accident and transient analyses in the FSAR, Chapter 6 (Ref. 1) and Chapter 15 (Ref. 2), assume that Engineered Safety Feature systems are OPERABLE. The DC electrical power system provides normal and emergency DC electrical power for the diesel generators (DGs), emergency auxiliaries, and control and switching during all MODES of operation. The OPERABILITY of the DC subsystems is consistent with the initial assumptions of the accident analyses and the requirements for the supported systems' OPERABILITY. The OPERABILITY of the minimum DC electrical power sources during MODES 4 and 5 and during movement of irradiated fuel assemblies in the secondary containment ensures that:

a.

The facility can be maintained in the shutdown or refueling condition for extended periods;

b.

Sufficient instrumentation and control capability is available for monitoring and maintaining the unit status; and

c.

Adequate DC electrical power is provided to mitigate events postulated during shutdown, such as an inadvertent draindown of the vessel or a fuel handling accident. The DC sources satisfy Criterion 3 of the NRC Policy Statement (Ref. 3). LCO The necessary Unit 2 DC electrical power subsystems -- with:

1) each station service DC subsystem consisting of one 125/250 V station service battery. (consisting of two 125 V batteries in series)=, two battery chargers, and the corresponding control equipment and interconnecting cabling; and

2) each DG DC subsystem consisting of one battery bank, one battery charger, and (continued)

HATCH UNIT 2 B386 EIIN3 B 3.8-63 REVISION 39

DC Sources - Shutdown B 3.8.5 BASES LCO (continued) the corresponding control equipment and interconnecting cabling -- are required to be OPERABLE to support required DC distribution subsystems required OPERABLE by LCO 3.8.8, "Distribution Systems - Shutdown." In addition, some components that may be required by Unit 2 require power from Unit 1 sources (e.g., Standby Gas Treatment (SGT) System and LPCI valve load centers). Therefore, the Unit 1 DG DC and the swing DG DC electrical power subsystems needed to provide DC power to the required Unit 1 components are also required to be OPERABLE. This requirement ensures the availability of sufficient DC electrical power sources to operate the unit in a safe manner and to mitigate the consequences of postulated events during shutdown (e.g., fuel handling accidents and inadvertent reactor vessel draindown). APPLICABILITY The DC electrical power sources required to be OPERABLE in MODES 4 and 5 and during movement of irradiated fuel assemblies in the secondary containment provide assurance that:

a.

Required features to provide adequate coolant inventory makeup are available for the irradiated fuel assemblies in the core in case of an inadvertent draindown of the reactor vessel;

b.

Required features needed to mitigate a fuel handling accident are available;

c.

Required features necessary to mitigate the effects of events that can lead to core damage during shutdown are available; and

d.

Instrumentation and control capability is available for monitoring and maintaining the unit in a cold shutdown condition or refueling condition. The DC electrical power requirements for MODES 1, 2, and 3 are covered in LCO 3.8.4. ACTIONS A.1, A.2.!, A.2.2, h,.2.3, and A,.2.IA.2. A.3, B.1, B.2. B.3 Conditions A and B represent one or more (Condition A) or one (Condition B) required subsystem with one or more required battery chargers inoperable (e.g.. the voltage limit of SR 3.8.4.1 is not maintained). The ACTIONS provide a tiered response that focuses on returning the battery, to the fully charaed state and restorina a fully qualified charoer to OPERABLE status in a reasonable time period. (continued) HATCH UNIT 2 B 3.8-64 REVISION 39

DC Sources - Shutdown B 3.8.5 Required Action A.1/B.1 requires that the battery terminal voltage be restored to areater than or equal to the minimum established float voltage within 2 hours. This time provides for returninq the inoperable charaer to OPERABLE status or providing an alternate means of restorinq battery terminal voltage to greater than or eaual to the minimum established float voltaqe. Restorinq the battery terminal voltage to greater than or equal to the minimum established float voltage provides good assurance that, within 12 hours, the battery will be restored to its fully charaed condition (Required Action A.2/B.2) from any discharqe that might have occurred due to the charaer inoperability. A discharqed battery having terminal voltage of at least the minimum established float voltage indicates that the battery is on the exponential charging current portion (the second part) of its recharae cycle. The time to return a battery to its fully charaed state under this condition is simply a function of the amount of the previous discharge and the recharge characteristic of the battery. Thus there is good assurance of fully recharging the battery within 12 hours. avoiding a premature shutdown with its own attendant risk. If established battery terminal float voltaae cannot be restored to areater than or equal to the minimum established float voltage within 2 hours, and the charaer is not operating in the current-limiting mode, a faulty charger is indicated. A faulty charger that is incapable of maintaining established battery terminal float voltage does not provide assurance that it can revert to and operate properlv in the current limit mode that is necessary during the recovery period following a battery discharge event that the DC system is designed for. If the charaer is operating in the current limit mode after 2 hours that is an indication that the battery is partially discharged and its capacity margins will be reduced. The time to return the battery to its fully charged condition in this case is a function of the battery charger capacity. the amount of loads on the associated DC system, the amount of the previous discharge, and the recharae characteristic of the battery. The charae time can be extensive, and there is not adeauate assurance that it can be recharoed within 12 hours (Required Action A.2/B.2). Required Action A.2/B.2 requires that the battery float current be verified as less than or equal to 20 amps for the station service battery or 5 amps for the DG battery. This indicates that, if the battery had been discharged as the result of the inoperable battery charger, it has now been fully rechargled. If at the expiration of the initial 12 hour period the battery float current is not less than or equal to 20 amps for the station service battery or 5 amps for the DG battery this indicates there may be additional battery problems and the battery must be declared inoperable. (continued) HATCH UNIT 2 B386 EIIN3 B 3.8-65 REVISION 39

DC Sources - Shutdown B 3.8.5 Required Action A.3/B.3 limits the restoration time for the inoperable battery charger to 72 hours. This action is applicable if an alternate means of restoring battery terminal voltaqe to areater than or eaual to the minimum established float voltage has been used (e.g.. balance of plant non-Class 1 E battery charger). The 72 hour Completion Time reflects a reasonable time to effect restoration of the gualified battery charger to OPERABLE status. C.1,.C.2.1,.C.2.2,.C.2.3. and 0.2.4 If more than one DC distribution subsystem is required according to LCO 3.8.8, the DC subsystems remaining OPERABLE with one or more DC power sources inoperable may be capable of supporting sufficient required features to allow continuation of CORE (continued) HATCH UNIT 2 B386 EIIN3 B3.8-66 REVISION 39

DC Sources - Shutdown B 3.8.5 BASES ACTIONS 0.1. C.2.1. C.2.2. 0.2.3. and C.2.4A.!. A.2.!. A.2.2, A.2.3, and A.2.1 (continued) ALTERATIONS, fuel movement, and operations with a potential for draining the reactor vessel. By allowance of the option to declare required features inoperable with associated DC power sources inoperable, appropriate restrictions are implemented in accordance with the affected system LCOs' ACTIONS. In many instances, this option may involve undesired administrative efforts. Therefore, the allowance for sufficiently conservative actions is made (i.e., to suspend CORE ALTERATIONS, movement of irradiated fuel assemblies in the secondary containment, and any activities that could result in inadvertent draining of the reactor vessel). Suspension of these activities shall not preclude completion of actions to establish a safe conservative condition. These actions minimize the probability of the occurrence of postulated events. It is further required to immediately initiate action to restore the required DC electrical power subsystems and to continue this action until restoration is accomplished in order to provide the necessary DC electrical power to the plant safety systems. The Completion Time of immediately is consistent with the required times for actions requiring prompt attention. The restoration of the required DC electrical power subsystems should be completed as quickly as possible in order to minimize the time during which the plant safety systems may be without sufficient power. SURVEILLANCE SR 3.8.5.1 REQUIREMENTS SR 3.8.5.1 requires performance of all Surveillances required by SR 3.8.4.1 through SR 3.8.4.83_. Therefore, see the corresponding Bases for LCO 3.8.4 for a discussion of each SR. This SR is modified by a Note. The reason for the Note is to preclude requiring the OPERABLE DC sources from being discharged below their capability to provide the required power supply or otherwise rendered inoperable during the performance of SRs. It is the intent that these SRs must still be capable of being met, but actual performance is not required. SR 3.8.5.2 This Surveillance is provided to direct that the appropriate Surveillances for the required Unit 1 DC sources are governed by the (continued) HATCH UNIT 2 B386 EIIN3 B 3.8-67 REVISION 39

DC Sources - Shutdown B 3.8.5 BASES SURVEILLANCE SR 3.8.5.2 (continued) REQU IREMENTS Unit 1 Technical Specifications. Performance of the applicable Unit 1 Surveillances will satisfy both any Unit 1 requirements, as well as satisfying this Unit 2 Surveillance Requirement. The Frequency required by the applicable Unit 1 SR also governs performance of that SR for both Units. REFERENCES ,1. FSAR, Chapter 6.

2.

FSAR, Chapter 15.

3.

NRC No. 93-102, "Final Policy Statement on Technical Specification Improvements," July 23, 1993. HATCH UNIT 2 B386 EIIN3 B3.8-68 REVISION 39

Battery G=ell-Parameters B 3.8.6 B 3.8 ELECTRICAL POWER SYSTEMS B 3.8.6 Battery Gell-Parameters BASES BACKGROUND This LCO delineates the limits on battery float current as well as electrolyte temperature, level, and float voltage, ,,nd" c pccific gravity* for the DC electrical power subsystems batteries. A discussion of these batteries and their OPERABILITY requirements is provided in the Bases for LCO 3.8.4, "DC Sources - Operating," and LCO 3.8.5, "DC Sources - Shutdown." In addition to the limitations of this Specification, the licensee controlled program also implements a program specified in Specification 5.5.15 for monitoring various battery parameters. The battery cells are of flooded lead acid construction with a nominal specific gravity of 1.215. This specific gravity corresponds to an open circuit battery voltage of approximately 124 V for 60 cell battery (i.e.. cell voltage of 2.07 volts per cell (Vpc)). The open circuit voltage is the voltage maintained when there is no charging or discharging. Once fully charged with its open circuit voltaqe > 2.07 Vpc. the battery cell will maintain its capacity for 30 days without further charging per manufacturer's instructions. Optimal lona term performance however. is obtained by maintaining a float voltaae 2.20 to 2.25 Vpc. This provides adequate over-potential which limits the formation of lead sulfate and self discharge. The nominal float voltage of 2.20 Vpc corresponds to a total float voltage output of 132 V for a 60 cell battery as discussed in the FSAR. Chapter 8 (Ref. 2). APPLICABLE SAFETY ANALYSES The initial conditions of Design Basis Accident (DBA) and transient analyses in the ESAR, Chapters 5 and 6 (Ref. 13_), and Unit 2 ESAR Chapter 154 (Ref. 2-4_), assume Engineered Safety Feature systems are OPERABLE. The DC electrical power subsystems provide normal and emergency DC electrical power for the diesel generators (DGs), emergency auxiliaries, and control and switching during all MODES of operation. The OPERABILITY of the DC subsystems is consistent with the initial assumptions of the accident analyses and is based upon meeting the design basis of the unit. This includes maintaining at least one vi4 subsystem of DC sources OPERABLE during accident conditions, in the event of:

a.

An assumed loss of all offsite AC or all onsite AC power; and (continued) REVISION 33 HATCH UNIT 1 B386 B 3.8-67

Battery Cell-Parameters B 3.8.6

b.

A postulated worst case single failure. Since battery eell-parameters support the operation of the DC electrical power subsystems, they satisfy Criterion 3 of the NRC Policy Statement (Ref. 46_). LCO Battery ee-ll-parameters must remain within acceptable limits to ensure availability of the required DC power to shut down the reactor and maintain it in a safe condition after an anticipated operational occurrence or a postulated DBA. Cel-I-Battery parameter limits are established to allow continued DC electrical system function even with Catogor;,A, and B limits not met. Additional preventative maintenance. testing, and monitoring performed in accordance with the licensee controlled program is conducted as specified in Specification 5.5.15. (continued) REVISION 33 HATCH UNIT 1 B386 B 3.8-68

Battery Cell-Parameters B 3.8.6 BASES (continued) APPLICABILITY The battery ee~l-parameters are required solely for the support of the associated DC electrical power subsystem. Therefore, theee-cell paaee* battery parameter limits are only required when the DC power source is required to be OPERABLE. Refer to the Applicability discussions in Bases for LCO 3.8.4 and LCO 3.8.5. ACTIONS A Note has been added providing that, for this LCO, separate Condition entry is allowed for each battery. This is acceptable, since the Required Actions for each Condition provide appropriate compensatory actions for each inoperable battery. Complying with the Required Actions for battery-eell parameters allows for restoration and continued operation, and subsequent out of limit battery Gell parameters may be governed by separate Condition entry and application of associated Required Actions. A.1. A.2, and A.3 With one or more cells in one or more batteries in one subsystem < 2.07 V. the battery cell is degraded. Within 2 hours verification of the required battery charaer OPERABILITY is made by monitoring the battery terminal voltage (SR 3.8.4.1) and of the overall battery state of charge by monitoring the battery float charqe current (SR 3.8.6.1). This assures that there is still sufficient battery capacity to perform the intended function. Therefore, the affected battery is not required to be considered inoperable solely as a result of one or more cells in one or more batteries < 2.07 V. and continued operation is permitted for a limited period up to 24 hours. Since the Required Actions only specify "perform." a failure of SR 3.8.4.1 or SR 3.8.6.1 acceptance criteria does not result in this Required Action not met. However, if one of the SRs is failed the appropriate Condition(s). depending on the cause of the failures, is entered. If SR 3.8.6.1 is failed then there is no assurance that there is still sufficient battery capacity to perform the intended function and the battery must be declared inoperable immediately. B.1, B.2. C.1, and C.2 One or more batteries in one subsystem with float current > 20 amps for station service batteries or > 5 amps for DG batteries indicates that a partial discharge of the battery capacity has occurred. This may be due to a temporary loss of a battery charger or possibly due to one or more battery cells in a low voltaqe condition reflecting some loss of capacity. Within 2 hours verification of the required battery charger (continued) HATCH UNIT 1 B386 EIIN3 B3.8-69 REVISION 33

B]attery G=eU--Parameters B] 3.8.6 OPERAB]ILITY is made by monitoring the battery terminal voltage, If the terminal voltaqe is found to be less than the minimum established float voltage there are two possibilities, the battery charaer is inoperable or is operating in the current limit mode. Condition A addresses charaer inoperability. If the charger is operating in the current limit mode after 2 hours that is an indication that the battery has been substantially discharged and likely cannot perform its reguired design functions. The time to return the battery to its fully charged condition in this case is a function of the battery charger capacity, the amount of loads on the associated DC system. the amount of the previous discharge, and the recharae characteristic of the battery. The charge time can be extensive, and there is not adequate assurance that it can be recharqed within 12 hours (Reguired Action B.2/C.2). The battery must therefore be declared inoperable. If the float voltage is found to be satisfactory but there are one or more batter, cells with float voltaae less than or equal to 2.07 V. the associated "OR"' statement in Condition G is applicable and the battery must be declared inoperable immediately. If float voltage is satisfactory and there are no cells less than or equal to 2.07 V there is aood assurance that. within 12 hours, the battery will be restored to its fully charged condition (Reguired Action B.2/C.2) from any discharge that might have occurred due to a temporary loss of the battery charger. A discharged battery with float voltage (the charger setpoint) across its terminals indicates that the battery is on the exponential charging current portion (the second part) of its recharae cycle. The time to return a battery to its fully charged state under this condition is simply a function of the amount of the previous discharge and the recharae characteristic of the battery. Thus there is good assurance of fully recharging the battery within 12 hours. avoiding a premature shutdown with its own attendant risk. If the condition is due to one or more cells in a low voltage condition but still greater than 2.07 V and float voltage is found to be satisfactory. this is not indication of a substantially discharged battery and 12 hours is a reasonable time prior to declaring the battery inoperable. Since Reguired Action B.1/C.1 only specifies "perform," a failure of SR 3.8.4.1 acceptance criteria does not result in the Reguired Action not met. However. if SR 3.8.4.1 is failed. the appropriate Condition(s). depending on the cause of the failure. is entered. D.1. D.2. and D.3 With one or more batteries in one subsystem with one or more cells (continued) HATCH UNIT 1 B387 EIIN3 B 3.8-70 REVISION 33

Battery Cell-Param eters B 3.8.6 electrolyte level above the top of the plates. but below the minimum established design limits, the battery still retains sufficient capacity to perform the intended function. Therefore. the affected battery is not required to be considered inoperable solely as a result of electrolyte level not met. Within 31 days the minimum established design limits for electrolyte level must be re-established. With electrolyte level below the top of the plates there is a potential for drvout and plate degradation. Reguired Actions D.1 and D.2 address this potential (as well as provisions in Specification 5.5.15. Battery Monitoring and Maintenance Program). They are modified by a Note that indicates they are only applicable if electrolyte level is below the top of the plates. Within 8 hours level is reguired to be restored to above the too of the plates. The Reguired Action D.2 reguirement to verify that there is no leakage by visual inspection and the Specification 5.5.15.b item to initiate action to egualize and test in accordance with manufacturer's recommendation are taken from IEEE Standard 450 (Ref. 1). They are performed following the restoration of the electrolyte level to above the top of the plates. Based on the results of the manufacturer's recommended testing the batteries may have to be declared inoperable and the affected cells replaced. E.1 With one or more batteries in one subsystem with pilot cell temperature less than the minimum established design limits, 12 hours is allowed to restore the temperature to within limits. A low electrolyte temperature limits the current and power available. Since the battery is sized with margin, while battery, capacity is degraded. sufficient capacity exists to perform the intended function and the affected battery is not reguired to be considered inoperable solely as a result of the pilot cell temperature not met. F. 1 With one or more batteries in redundant subsystems with battery parameters not within limits there is not sufficient assurance that battery capacity has not been affected to the degree that the batteries can still perform their reguired function. given that redundant batteries are involved. With redundant batteries involved this potentially could result in a total loss of function on multiple systems that rely upon the batteries. The longer Completion Times specified for battery parameters on non-redundant batteries not within limits are therefore not appropriate, and the parameters must be restored to within limits on at least one subsystem within 2 hours. (continued) HATCH UNIT 1 B387 EIIN3 B3.8-71 REVISION 33

Battery C~ell-ParametersI B 3.8.6 met, or Ca,?tegory',A and B limits not mot) bu-t within tho Caotegory C the, affected,, battery is not required to-be considered,,, ino-perable, solely, The pi;lot cell1 electrolyt level and float* vorltage are requre to* be verified to,,, meet-tlhe* Ctegory C-* lmts* wit;-;hin 1 hour (Requiredr*,; Verificationthat te Caitego C limits.*+"*;" ar*ca .. metlfl (Rqure ActionA+" intoconidertio boh th tie rquird tpeformthereqirued) HATCH UNIT 1 B 3.8-72 REVISION 33 HATCH UNIT 1 B 3.8-72 REVISION 33

Battery Cell-Parameters B 3.8.6 BASES verification is repeated at 7 day inter:als until the parameters arc restored to Category A and B limits. This periodic verification is consistent with the normal Frequency of pilot cell surveillances. timen toauny restoethry batamter cel paramdether tolnormalce limts thie Required Actions for Condition A. B. C. D. E. o*r ,Caogory C... limi for any connected scll sufficient capacity to supply the maximum expected load requirement is not ensured and the corresponding DC electrical power.... subsytembt.er must be declared inoperable. Additionally, discovering one or more batteries in one subsystem with one or more battery cells float voltage less than or equal to 2.07 V and float current areater than 20 amps for the station service batteries or areater than 5 amos for the DG batteries indicates that the battery capacity may not be sufficient to perform the intended functions. The battery must therefore be declared inoperable immediately.et-ei* Action of. Condition;÷,, A wit;hin* the required Completion Tim or. .avrage electrolyte tempeatue+. of represenativef; cells falling below^ the appropriat limit (6 0oF for station serice andl /11"oF for DG SURVEILLANCE SR 3.8.6.1 REQUIREMENTS Verifying battery float current while on float charge is used to determine the state of charqe of the battery. Float charge is the condition in which the charger is supplying the continuous charae required to overcome the internal losses of a battery and maintain the battery in a charged state. The equipment used to monitor float current must have the necessary accuracy and capability to measure electrical currents in the expected ranqe. The float current (continued) HATCH UNIT 1 B387 EIIN6 B 3.8-73 REVISION 69

Battery Cell-Parameters B 3.8.6 requirements are based on the float current indicative of a charged battery. The Frequency is controlled under the Surveillance Freauencv Control Program. This SR is modified by a Note that states the float current requirement is not required to be met when battery terminal voltage is less than the minimum established float voltage of SR 3.8.4.1. When this float voltage is not maintained the Required Actions of LCO 3.8.4 ACTIONs B or D are beinq taken. which provide the necessary and appropriate verifications of the battery condition. Furthermore, the float current limit is established based on the nominal float voltage value and is not directly applicable when this voltaoe is not maintained (Ref. 7). SR 3.8.6.2 and SR 3.8.6.5 Optimal long term battery, performance is obtained by maintaininq a float voltage greater than or equal to the minimum established desiqn limits provided by the battery, manufacturer. which corresponds to 132 V at the battery terminals, or 2.20 Vpc. This provides adequate over-potential. which limits the formation of lead sulfate and self discharqe, which could eventually render the battery inoperable. Float voltaaes in this ranqe or less, but greater than 2.07 Vpc. are addressed in Specification 5.5.15. SRs 3.8.6.2 and 3.8.6.5 require verification that the cell float voltages are greater than 2.07 V. The Surveillance Frequency for cell voltage verification for pilot cell and for each connected cell is controlled under the Surveillance Frequency Control Program. SR 3.8.6.3 The limit specified for electrolyte level ensures that the plates suffer no physical damage and maintains adequate electron transfer capability. The minimum design electrolyte level is the minimum level indication mark on the battery, cell iar. The Frequency is controlled under the Surveillance Frequency Control Program. SR 3.8.6.4 This Surveillance verifies that the pilot cell temperature is greater than or equal to the minimum established design limit (i.e.,65 F for the station service batteries and 40°F for the diesel generator batteries'). Pilot cell electrolyte temperature is maintained above this temperature to assure the battery can provide the required current and voltage to meet the desiqn requirements. Temperatures lower than assumed in battery, sizinq calculations act to inhibit or reduce battery, capacity. The Frequency is controlled under the Surveillance Frequency Control Program. (continued) HATCH UNIT 1 B3.8-74 REVISION 69

Battery GeU-Parameters B 3.8.6 SR 3.8.6.6 A battery performance discharge test is a test of constant current capacity of a battery. normally done in the as found condition, after having been in service, to detect any change in the capacity determined by the acceptance test. The test is intended to determine overall battery degradation due to aae and usage. Either the battery performance dischargle test or the modified performance discharge test is acceptable for satisfying SR 3.8.6.6: however. only the modified performance discharge test may be used to satisfy the battery service test reguirements of SR 3.8.4.3. A modified discharge test is a test of the battery capacity and its ability to provide a high rate. short duration load (usually the highest rate of the duty cycle). This will often confirm the battery's ability to meet the critical period of the load duty cycle, in addition to determining its percentage of rated capacity. Initial conditions for the modified performance discharge test should be identical to those specified for a service test. It may consist of iust two rates: for instance, the one minute rate for the battery or the largest current load of the duty cycle, followed by the test rate emploved for the performance test. both of which envelope the duty cycle of the service test. Since the ampere-hours removed by a one minute discharge represents a very small portion of the battery, capacity. the test rate can be changed to that for the performance test without compromising the results of the performance discharge test. The battery terminal voltage for the modified performance discharge test must remain above the minimum battery terminal voltage specified in the battery service test for the duration of time equal to that of the service test. IEEE-450 (Ref. 1) describes three tvpes of modified performance discharge tests. The discharge test described in the preceding paragraph is the Tvpe 1 test. The Type 2 and Tvpe 3 tests, however. are also suitable to satisfy this surveillance. The acceotance criteria for this Surveillance are consistent with IEEE-450 (Ref. 1) and IEEE-485 (Ref. 5'). These references recommend that the battery be replaced if its capacity is below 80% of the manufacturer's rating. A capacity of 80% shows that the battery rate of deterioration is increasing, even if there is ample capacity to meet the load reguirements. Furthermore. the battery is sized to meet the assumed duty cycle loads when the battery design capacity reaches this 80%o limit. The Frequency for this test is in accordance with the Surveillance ('continued) HATCH UNIT 1 B387 EIIN6 B 3.8-75 REVISION 69

Battery Gel-I-Parameters B 3.8.6 Freauencv Control Program. If the battery shows degradation, or if the battery has reached 85% of its expected life and capacity is < 100% of the manufacturer's rating, the Surveillance Freauency is reduced to 12 months. However, if the battery shows no degradation but has reached 85% of its expected life, the Surveillance Freauency is only reduced to 24 months for batteries that retain capacity -> 100% of the manufacturer's rating. Degradation is indicated, according to IEEE-450 (Ref. 1). when the battery capacity drops by more than 10% relative to its capacity on the previous performance test or when it is 10% below the manufacturer's rating. This SR is modified by a Note. The reason for the Note is that performing the Surveillance would remove a reguired DC electrical power subsystem from service. perturb the electrical distribution system, and challenae safety systems. This SR vcr11 cs That Q Catcgol,'n-, A**, batter,' ce -,-nfll parameters +harc con.sistentwith IEEE-, 150 (Ref. 3),. The, Surveillance Freque...*ncy i (continued) HATCH UNIT 1 B387 EIIN6 B3.8-76 REVISION 69

Battery Gell-Parametersi B 3.8.6 BASES SURVILLIIIIANCEr REQUIREMENTS SR 3.8.6.2 (continued) is also consistent with IEEE 150 (Ref. 3), whieh recommends special "-inspections .fo..llow..in a..severe... ovrhare to. ensure.. that no SR-3.9.5.3 represekntativ ce.. l.ls is.. within h limit scosset witho* a .I---Af of.electrolyte.in.representative.cells heu.d b re-'detried i acordac ihteSr'ilneFeunyCnrlPorm Lowe thn nrma teperaure ac toinhbit r rduc bater within nain acceptabl hoperating range. Tha,.-is limi hisI based en IEEE150 Category A÷ dfines* thteo fnorma parameter li.mit orahdsgae p ilot cell VQ I in eacVbattey. Th cel seece asi pilo elsaehs whs temeraureIvltageV*VIiV and eletroyt seIfic graI *vity ii (continued) HATCH UNIT 1 B387 EIIN6 B3.8-77 REVISION 69

Battery Cell-Parameters B 3.8.6 BASES SURVILLANCEr,'. Tablen.8.6 1*Q (continued) REQUI REMENTS ,Ahic-h states* that+ prolonged., operationr of cells, below' 2.1 V can reduce t.,4he Ilife expecta,'l~nc of ce lls. The Category.*t* A limit speci*-,fied.- for* speci,'fic.' g-ravJ*ity for eac.'h p~ilot, cellI readings*,-' are based on a temperature of 77°F (25°C). temperature and level.,* For, each 3oF (1.67o 0 C) above 77orF (25OC), 30 F* below'* 77 0F. The speific gravity of the electrolyte÷, in a cell inc,'reases with a. loss*- o,*f wate*l-r duen to, e, lect4ro*lysis, or evaporation.' Level corectionm.' wn.~mm'ir-. ,llbe in accodanc.w*,'it manufacturer's-*I ÷,-.l Category B... defne the.. normal pa" .*.ramet-er limits for.each conn eed cellTh term "con, necedcel excnlue any*uiv bater cel.n tha mayvbe f,,lh,. ed-e,. ut,,'.',m*'l*, ,h \\,^il l*,., {,I The,. Catego,' B, limits spec*ified,, fory electolyt level. and floa volag are-the same, asOl those specife fo Catego ih,,,r-y.., A and,,,'* haveh been',,,- discussed abovel.-*-. The Catego'*ry B limit specified ~r.;* forh spcii gravity* f.- for each*l.* connecte cell is.-J Žr.*I 1-.195*I (.020 be*low.*m '. the manu*factuer' full chrge, nminl seciic ravty)wit thavrag -ofall o connected co;,.Ils 1.205-,.*-i÷. (0,.010,- belowi .,, the,' manufacturer's fully charged,- installed* cel dono m ask on,*vera*ll degradatio *n o the*u battery. Category,""C defi*nes,-, the l"'"im÷"its fori*,* each* connected,' cell*.Ths va*mlues4., pe~m th intndedfuncionand aintin amargn ofsafty.nWhen anATbtter'Nparmete is-7 ousdRh

aeo, iitEVasSuraNce9

Battery Cell-ParametersI B 3.8.6 BASES REQUI REM ENTS The, Category.C limit for voltag is,,* basedon* IEE 150= (Ref. 3), which states that÷ a* cell v,,Itagc, of* 2.0'7 V1 or below,, under,* float condition and, manufacturer's, recommended,',4 full charged,,* ,, nominal spccific* gravity)÷"*... connected,÷*, cellI mus be no less tha 0.020 C below*I*^ the averag of all Tabel-3.8.6 "1 require the' a* bove mentioned', corrctio for" eloctrolyte, y condition. rechrgin process*. , delay of several... day ma'occur.whie.waitin for. the speifi gravit to;,, stabilize... A÷stbiliedcarge ,,,curre~nt isa acceptablen anlternative to specificlnu granvity measureme~nt foetrinn the state*, of* chrgreofl the*, designatedpilot\\ cell "Thisl, phenomeno s1,,,1*" discussed inov IEEE 150 (Ref 3) Foonot (c to Table 3.8.6; 1* allows the* fla chagecuren to be used*,;,- as a÷rn altrnae t speifi grvit for up to 7 days following a batter recharge. REFERENCES

1.

IEEE-450-2002.

2.

FSAR, Chaoter 8 .1-3. FSAR, Chapters 5 and 6. 2-4. Unit___ 2 FSAR, Chapter 15_4.

35.

IEEE Standard 150-1987 IEEE Standard 485. 1983.

46.

NRC No. 93-1 02, "Final Policy Statement on Technical Specification Improvements," July 23, 1993. HATCH UNIT 1 B 3.8-79 REVISION 69

Battery Cell-Parameters B 3.8.6

7.

Modification (and respective Base) Calculations MG-H-i14-0009. 0010. and 0014: (SENH-92-1 37. SENH-92-1 36. SENH-97-014) HATCH UNIT 1 B388 EIIN6 B 3.8-80 REVISION 69

Battery G=ell-Parameters B 3.8.6 B 3.8 ELECTRICAL POWER SYSTEMS B 3.8.6 Battery Gell-Parameters BASES BACKGROUND This LCO delineates the limits on battery float current as well as electrolyte temperature, level, and float voltage, and specific gravity for the DC electrical power subsystems batteries. A discussion of these batteries and their OPERABILITY requirements is provided in the Bases for LCO 3.8.4, "*DC Sources - Operating," and LCO 3.8.5, "DC Sources - Shutdown." In addition to the limitations of this Specification, the licensee controlled program also implements a program specified in Specification 5.5.15 for monitoring various battery parameters. The battery cells are of flooded lead acid construction with a nominal specific gravity of 1.215. This specific gravity corresponds to an open circuit battery voltage of approximately 124 V for 60 cell battery (i.e., cell voltage of 2.07 volts per cell (Vpc)). The open circuit voltage is the voltage maintained when there is no charging or discharging. Once fully charged with its open circuit voltage > 2.07 Vpc. the battery cell will maintain its capacity for 30 days without further charging per manufacturer's instructions. Optimal Ionq term performance however. is obtained by maintaining a float voltage 2.20 to 2.25 Vpc. This provides adequate over-potential which limits the formation of lead sulfate and self discharge. The nominal float voltaae of 2.20 Vpc corresponds to a total float voltage output of 132 V for a 60 cell battery as discussed in the FSAR. Chapter 8 (Ref. 2). APPLICABLE SAFETY ANALYSES The initial conditions of Design Basis Accident (DBA) and transient analyses in the ESAR, Chapter 6 (Ref. __), and Chapter 15 (Ref. 2-4_), assume Engineered Safety Feature systems are OPERABLE. The DC electrical power subsystems provide normal and emergency DC electrical power for the diesel generators (DGs), emergency auxiliaries, and control and switching during all MODES of operation. The OPERABILITY of the DC subsystems is consistent with the initial assumptions of the accident analyses and is based upon meeting the design basis of the unit. This includes maintaining at least one d~ee subsystem of DC sources OPERABLE during accident conditions, in the event of:

a.

An assumed loss of all offsite AC or all onsite AC power; and (continued) REVISION 39 HATCH UNIT 2 B386 B 3.8-67

Battery Gell-Parameters B 3.8.6

b.

A postulated worst case single failure. Since battery c-ell-parameters support the operation of the DC electrical power subsystems, they satisfy Criterion 3 of the NRC Policy Statement (Ref. 4_6). LCO Battery eell-parameters must remain within acceptable limits to ensure availability of the required DC power to shut down the reactor and maintain it in a safe condition after an anticipated operational occurrence or a postulated DBA. GelI-Battery parameter limits are established to allow continued DC electrical system function even with Categor,' A and B limits not met. Additional preventative maintenance. testing, and monitoring performed in accordance with the licensee controlled program is conducted as specified in Specification 5.5.15. (continued) HATCH UNIT 2 B 3.8-68 REVISION 39 B 3.8-68 REVISION 39

Battery Gell-Parameters B 3.8.6 BASES (continued) APPLICABILITY The battery eetl-parameters are required solely for the support of the associated DC electrical power subsystem. Therefore, theeeeeill par&imete~sbattery parameter limits are only required when the DC power source is required to be OPERABLE. Refer to the Applicability discussions in Bases for LCO 3.8.4 and LCO 3.8.5. ACTIONS A Note has been added providing that, for this LCO, separate Condition entry is allowed for each battery. This is acceptable, since the Required Actions for each Condition provide appropriate compensatory actions for each inoperable battery. Complying with the Required Actions for battery Gel-Iparameters allows for restoration and continued operation, and subsequent out of limit battery e parameters may be governed by separate Condition entry and application of associated Required Actions. A.1. A.2. and A.3 With one or more cells in one or more batteries in one subsystem < 2.07 V. the battery cell is degraded. Within 2 hours verification of the required battery charaer OPERABILITY is made by monitoring the battery terminal voltaae (SR 3.8.4.1) and of the overall battery state of charge by monitoring the battery float charge current (SR 3.8.6.1). This assures that there is still sufficient battery capacity to perform the intended function. Therefore. the affected battery is not required to be considered inoperable solely as a result of one or more cells in one or more batteries < 2.07 V. and continued operation is permitted for a limited period up to 24 hours. Since the Required Actions only specify "perform." a failure of SR 3.8.4.1 or SR 3.8.6.1 acceptance criteria does not result in this Required Action not met. However, if one of the SRs is failed the appropriate Condition(s). depending on the cause of the failures. is entered. If SR 3.8.6.1 is failed then there is no assurance that there is still sufficient battery capacity to perform the intended function and the battery must be declared inoperable immediately. B.1. B.2. C.1. and C.2 One or more batteries in one subsystem with float current > 20 amps for station service batteries or > 5 amps for DG batteries indicates that a partial discharge of the battery, capacity has occurred. This may be due to a temporary loss of a battery charaer or possibly due to one or more battery cells in a low voltaae condition reflecting some loss of capacity. Within 2 hours verification of the required battery charger (continued) HATCH UNIT 2 B386 EIIN3 B 3.8-69 REVISION 39

Battery GekLlparameters B 3.8.6 OPERABILITY is made by monitoring the battery terminal voltage. If the terminal voltage is found to be less than the minimum established float voltage there are two possibilities, the battery charaer is inoperable or is operating in the current limit mode. Condition A addresses charger inoperability. If the charger is operating in the current limit mode after 2 hours that is an indication that the battery has been substantially discharged and likely cannot perform its reguired design functions. The time to return the battery to its fully charged condition in this case is a function of the battery charger capacity. the amount of loads on the associated DC system. the amount of the previous discharge, and the recharge characteristic of the battery. The charae time can be extensive, and there is not adequate assurance that it can be recharged within 12 hours (Reguired Action B.2/C.2). The battery must therefore be declared inoperable. If the float voltaae is found to be satisfactory but there are one or more battery cells with float voltage less than or equal to 2.07 V. the associated "OR" statement in Condition G is applicable and the battery must be declared inoperable immediately. If float voltage is satisfactory and there are no cells less than or equal to 2.07 V there is good assurance that. within 12 hours, the battery will be restored to its fully charged condition (Reguired Action B.2/C.2) from any discharge that might have occurred due to a temporary loss of the battery charger. A discharged battery with float voltage (the charqer setpoint') across its terminals indicates that the battery is on the exponential charging current portion (the second part) of its recharge cycle. The time to return a battery to its fully charged state under this condition is simply a function of the amount of the previous discharge and the recharae characteristic of the battery. Thus there is aood assurance of fully recharging the battery within 12 hours. avoiding a premature shutdown with its own attendant risk. If the condition is due to one or more cells in a low voltage condition but still greater than 2.07 V and float voltage is found to be satisfactory. this is not indication of a substantially discharged battery and 12 hours is a reasonable time prior to declaring the battery inoperable. Since Reguired Action B.1/C.1 only specifies "perform," a failure of SR 3.8.4.1 acceptance criteria does not result in the Reguired Action not met. However. if SR 3.8.4.1 is failed. the appropriate Condition(s). depending on the cause of the failure. is entered. D.1. D.2. and D.3 With one or more batteries in one subsystem with one or more cells (continued) HATCH UNIT 2 B387 EIIN3 B 3.8-70 REVISION 39

Battery GeU-parameters B 3.8.6 electrolyte level above the top of the plates. but below the minimum established design limits, the battery still retains sufficient capacitv to perform the intended function. Therefore. the affected battery is not required to be considered inoperable solely as a result of electrolyte level not met. Within 31 days the minimum established design limits for electrolyte level must be re-established. With electrolyte level below the too of the plates there is a potential for drvout and plate degradation. Reguired Actions D.1 and D.2 address this potential (as well as provisions in Specification 5.5.15, Battery Monitoring and Maintenance Program'). They are modified by a Note that indicates they are only applicable if electrolyte level is below the top of the plates. Within 8 hours level is required to be restored to above the too of the plates. The Required Action D.2 requirement to verify that there is no leakaqe by visual inspection and the Specification 5.5.15.b item to initiate action to equalize and test in accordance with manufacturer's recommendation are taken from IEEE Standard 450 (Ref. 1). They are performed following the restoration of the electrolyte level to above the top of the plates. Based on the results of the manufacturer's recommended testing the batteries may have to be declared inoperable and the affected cells replaced. E.1 With one or more batteries in one subsystem with pilot cell temperature less than the minimum established design limits, 12 hours is allowed to restore the temperature to within limits. A low electrolyte temperature limits the current and power available. Since the battery is sized with margin, while battery capacity is degraded. sufficient capacity exists to perform the intended function and the affected battery is not required to be considered inoperable solely as a result of the pilot cell temperature not met. F. 1 With one or more batteries in redundant subsystems with battery parameters not within limits there is not sufficient assurance that battery capacity has not been affected to the dearee that the batteries can still perform their required function, given that redundant batteries are involved. With redundant batteries involved this potentially could result in a total loss of function on multiple systems that rely upon the batteries. The Ionoer Completion Times specified for battery parameters on non-redundant batteries not within limits are therefore not appropriate. and the parameters must be restored to within limits on at least one subsystem within 2 hours. (continued) HATCH UNIT 2 B387 EIIN3 B 3.8-71 REVISION 39

Battery Cell-Parameters B 3.8.6 met, or Category A and B limits not met) but within the Category C limits specified in Table 3.8.6 1, the batter,' is degraded but there is still sufficient capacity to perform the intended function. Therefore, the affected batten' is not required to be considered inoperable solely as a result of Category A or B limits not mot, and continued operation it; purrriTtuu*. ur -u Ilrii.,tuu..ru... The pilot cell electrolyte level and float voltage are required to be verified to meet the Category C limits within 1 hour (Requirod Action A.1). This check provides a quick indication of the status of the remainder of the battery cells. One hour provides time to inspect the electrolyte level and to confirm the float voltage of the pilot cells. One hour is considered a reasonable amount of time to perform the required verification. Verification that÷ the Cateory C... limits are.. me (Require Actio...... .^..n A.2) p

• rovideCs assurance. that* during* the, tim needed to,, restore t, he pra.*'meters, fto the Category*'

A a'nd B* limits*, the' batte÷ry is, still capable*IM of~ prformng;itsintnded fu÷nctiron. Arn peiod-*-- of-' 21~r ÷housi a~llowed (continued) HATCH UNIT 2 B3.8-72 REVISION 39

Battery CellI-Parameters B 3.8.6 ACTIONS A.! A.2 an A.3, (cont,,-,inucd),4 consistcntf wit;h the n..orml Frcguency of, p;ilot,cell surveil*;lance. time to fullh. restor the batter; ee*ll parameter to norml imits, this BG.1 When any battery parameter is outside the allowances of the RequJired Actions for Condition A. B. C. D. E. or_***°÷... F~tgr, C,,,,; limit.fo any.connecte cel,4 sufficient capacity to supply the maximum expected load requirement is not ensured and the corresponding PG electrical1....... powr b ytcmbahtterv must be declared inoperable. Additionally, discovering one or more batteries in one subsystem with one or more battery cells float voitage less than or equai to 2.07 V and float current areater than 20 amps for the station service batteries or areater than 5 amps for the DG batteries indicates that the battery .capacity may not be sufficient to perform the intended functions. The ba~ttery must therefore be declared inoperable immediately.ethei* potentiall extreme, coniton, sucha n-ot completingz the* Required~l* nDC,_ electrical power... subsyste inoperab.e... SURVEILLANCE SR 3.8.6.1 REQUIREMENTS _Verifying battery float current while on float charge is used to determine the state of charge of the battery. Float charge is the condition in which the charger is supplying the continuous charqe reguired to overcome the internal losses of a battery and maintain the battery in a charaed state. The equipment used to monitor float current must have the necessary accuracy and capability to measure electrical currents in the expected range. The float current (continued) HATCH UNIT 2 B387 EIIN7 B3.8-73 REVISION 79

Battery Gell-Parameters B 3.8.6 requirements are based on the float current indicative of a charged battery. The Frequency is controlled under the Surveillance Frequency Control Program. This SR is modified by a Note that states the float current requirement is not required to be met when battery terminal voltaae is less than the minimum established float voltaae of SR 3.8.4.1. When this float voltage is not maintained the Required Actions of LCO 3.8.4 ACTIONs B or D are beinq taken. which provide the necessary and appropriate verifications of the battery condition. Furthermore, the float current limit is established based on the nominal float voltage value and is not directly applicable when this voltaae is not maintained (Ref. 7). SR 3.8.6.2 and SR 3.8.6.5 Optimal long term battery performance is obtained by maintaining a float voltaae areater than or equal to the minimum established design limits provided by the battery manufacturer, which corresponds to 132 V at the battery terminals, or 2.20 Vpc. This provides adequate over-potential, which limits the formation of lead sulfate and self discharge, which could eventually render the battery inoperable. Float voltages in this ranae or less. but areater than 2.07 Vpc. are addressed in Specification 5.5.15. SRs 3.8.6.2 and 3.8.6.5 require verification that the cell float voltaqes are greater than 2.07 V. The Surveillance Frequency for cell voltaqe verification for pilot cell and for each connected cell is controlled under the Surveillance Frequencv Control Program. SR 3.8.6.3 The limit specified for electrolyte level ensures that the plates suffer no physical damage and maintains adequate electron transfer capability. The minimum design electrolyte level is the minimum level indication mark on the battery cell iar. The Frequency is controlled under the Surveillance Frequency Control Program. SR 3.8.6.4 This Surveillance verifies that the pilot cell temperature is greater than or equal to the minimum established design limit (i.e.. 65 F for the station service batteries and 40°F for the diesel generator batteries). Pilot cell electrolyte temperature is maintained above this temperature to assure the batterv can provide the required current and voltage to meet the design requirements. Temperatures lower than assumed in batterv sizing calculations act to inhibit or reduce batterv capacity. The Freauency is controlled under the Surveillance Frequencv Control Program. (continued) HATCH UNIT 2 B387 EIIN7 B 3.8-74 REVISION 79

Battery GeP,-Parameters B 3.8.6 SR 3.8.6.6 A battery performance discharge test is a test of constant current capacity of a battery. normally done in the as found condition, after having been in service, to detect any change in the capacity determined by the acceptance test. The test is intended to determine overall battery degradation due to age and usage. Either the battery performance discharge test or the modified performance discharge test is acceptable for satisfying SR 3.8.6.6: however. only the modified performance discharge test may be used to satisfy the battery service test reguirements of SR 3.8.4.3. A modified discharge test is a test of the battery capacity and its ability to provide a high rate. short duration load (usually the highest rate of the duty cycle). This will often confirm the battery's ability to meet the critical period of the load duty cycle, in addition to determining its percentaae of rated capacity. Initial conditions for the modified performance discharge test should be identical to those specified for a service test. It may consist of iust two rates: for instance, the one minute rate for the battery or the larolest current load of the duty cycle, followed by the test rate emploved for the performance test, both of which envelope the duty cycle of the service test. Since the ampere-hours removed by a one minute discharge represents a very small portion of the battery capacity. the test rate can be chanqed to that for the oerformance test without compromising the results of the performance discharge test. The battery terminal voltaae for the modified performance discharge test must remain above the minimum battery terminal voltage specified in the battery service test for the duration of time equal to that of the service test._ I EEE-450 (Ref. 1) describes three types of modified performance discharge tests. The discharge test described in the preceding paragraph is the Tvpe 1 test. The Type 2 and Tvpe 3 tests, however. are also suitable to satisfy this surveillance. The acceptance criteria for this Surveillance are consistent with IEEE-450 (Ref. 1) and IEEE-485 (Ref. 5). These references recommend that the battery be replaced if its capacity is below 80% of the manufacturer's rating. A capacity of 80% shows that the batterv rate of deterioration is increasing, even if there is ample capacity to meet the load reguirements. Furthermore. the batterv is sized to meet the assumed duty cycle loads when the battery design capacity reaches this 8000 limit. The Freauency for this test is in accordance with the Surveillance (continued) HATCH UNIT 2 B387 EIIN7 B3.8-75 REVISION 79

Battery Gell-Parameters B 3.8.6 Frequencv Control Program. If the battery shows degradation. or if the battery has reached 85% of its expected life and capacitv is < 100% of the manufacturer's rating, the Surveillance Frequency is reduced to 12 months. However, if the battery shows no degradation but has reached 85% of its expected life, the Surveillance Frequency is only reduced to 24 months for batteries that retain capacity > 100% of the manufacturer's rating. Degradation is indicated, according to IEEE-450 (Ref. 1). when the battery capacitv drops by more than 10% relative to its capacitv on the previous performance test or when it is 10% below the manufacturer's rating. T This SR is modified by a Note. The reason for the Note is that performing the Surveillance would remove a reguired DC electrical power subsystem from service. perturb the electrical distribution system. and challenge safety systems. ThSR veiie.ht8.cor'Abatr' elpaaeer2r consstet wth EEE 50 Ref 3) whih rcomend reglarbater/ inspections includin vrol-_*tage, spcii g.ravitly,-and electrolyte lv-el.,, of pilot ce*,*-,*÷'lls*r. The"÷h'

I Su.ellnc Frqec i..... cont,*rolle under*' the Su"rela.tf~***thnce

/ I,.- Frqec Control Prora.h,*t, t I÷ ÷- (continued) HATCH UNIT 2 B387 EIIN7 B 3.8-76 REVISION 79

Battery Cell-Parameters B 3.8.6 BASES SU RVEILL.ANCE REQUIREMENTS SR 3.8.6.2 (co,-ntinuod),4 inspections follow."ing* a..s..voro. overcharge, to* ensure. ti. hat,, nov significant degradation o-f the" batter' occurs.as.a.consequence of sueh-eveehe*ge accordance wit;h the Su..'e*illan.e Fequency* Co*ntrol Progam Lower.than.noral.temperature act to.. inii or... reucbttrym or the maJnufctrern r'sr recommendations* when provided. This table, delineates,, the, limits+ on. electrolyte, leel float. voltage,+ and., p""ilOt.. cel in. eah batter.- Thecll selected, as+, piot cells-, arei t.. hese whose teperatr e,

• .*voltage+

,,,+ and. electrolyte,-,,, speci fic gravity+, The Ctgr iit"pcfe o electrolyte level edng hu~, *,, are, based, en*,,.. gidancevii iniQ IEE 150 (Ref 3), Wt thev exta IichVlloanc above the,, hig wae levelindication*,v for* operating margin6 to account,, (continued) HATCH UNIT 2 B 3.8-77 REVISION 79 HATCH UNIT 2 B3.8-77 REVISION 79

Battery Cell-Parametersi B 3.8.6 SURVEILLANCE Tabhle 3.8. 1 (continued).. ,4 REQUI!REMENTS This valueh is.' b*..ased on-the *',-,'recommendation;', o'f IEEEr 150 (Ref. 3), w,,hich states-, that÷ pro,-longed,.,r operationr o,.f cells, belowA 2.1 V' can.-J-reduei th

• l*V if expectancyi ofV cei lVls.

VI

• IV 1l

~ is 1-i.20 (0.01 be** low the~ manuactuer' fully charged nmi~mnall low, value, Tlhis value,- is-characteristic of a c-harged*, cell1 wit;h adequate,*÷ capacity.n AccordVing& to iEE 15 (Rf ) h peiirvt Level correction will be in accordance w:ith manuJfactuJrer's recommendations÷.-*,. ,.,.*.h,*,'"'Sk÷*.. h .. k Categor; B deie h ora aaeerlmt o.ec once are the same as those specified for Categor,' A and have been discussed above. The Catogor; B limit specified for specific gravity for each connected cell is Ž 1.195 (0.020 below the manufacturer's fully charged, nominal specific gravity) with the average of all connected cells 1.205 (0.010 below the manufacturers fully charged, nominal specific gravi~'). These values are based en manufacturer's recommendations. The minimum specific gravity value required for each cell ensures that the effects of a highly charged or newly installed cell do not mask overall degradation of the batter' TCategory' C defines theclimits for eahctonneted cell **.. These vaue,,,-, alhuh* 1÷,,*,4* n*l^;,* reduedproide ssuanc that suffcien caact exists to-pe,,or the,, intended function.. and maintai a.... margin of, sft..Whe an"attr; araete isoutidetheCatgor C imi, te asurncined ofAsuficintIcaacit describe aboeVoIonerexst, ndth

Battery CelL-parameters I B 3.8.6 BASES SURVILL/--I NCIE Tab-Jlo 3.. 1 (continuod)l-*~l REQUIREMENTS problems and may requir ce*ll replaceent Inaddition to thateglimit, it is, reured that thsecfi gravity '--÷"+ for eac m or nwcldostnotb mskovierall dgrisandato of0. thef battery. s Thaootoe tb o Table.. 3;,÷.8..6 that apply. to specific... grvt are applicable* to Categenr',' A, B, aornd C* speIfic gravity Fo~otnote. (b),., of Tale 3".8.6, 1m Ir-equires the abov mentioned,*f, correc÷*Tion fo eleet11,,,ol REFERENCES HATCH UNIT 2

1.

IEEE-450-2002.

2.

FSAR. Chaoter 8 -I3-. FSAR, Chapters 6. 2-4_. FSAR, Chapter 15. 3_5. IEEE Standard,, 150_ 1987 IEEE Standard 485. 1983. 4_6. NRC No. 93-102, "Final Policy Statement on Technical Specification Improvements," July 23, 1993. B 3.8-79 REVISION 39

Battery GeUl-Parameters B 3.8.6

7.

Modification (and respective Base) Calculations MC-H 0009. 0010. and 0014: (SENH-92-1 37. SENH-92-1 36. SENH-97-014) HATCH UNIT 2 B388 EIIN3 B 3.8-80 REVISION 39

Edwin I. Hatch Nuclear Plant - Units 1 and 2 License Amendment Request for Adoption of Technical Specifications Task Force (TSTF) Traveler TSTF-500, Revision 2, "DC Electrical Rewrite - Update To TSTF-360". Clean Technical Specifications Pages

DC Sources - Operating 3.8.4 3.8 ELECTRICAL POWER SYSTEMS 3.8.4 DC Sources - Operating LCO 3.8.4 The following DC electrical power subsystems shall be OPERABLE:

a.

The Unit 1 Division 1 and Division 2 station service DC electrical power subsystems;

b.

The Unit 1 and the swing DGs DC electrical power subsystems; and

c.

The Unit 2 OG DC electrical power subsystems needed to support the equipment required to be OPERABLE by LCO 3.6.4.3, "Standby Gas Treatment (SGT) System," and LCO 3.8.1, "AC Sources - Operating." APPLICABILITY: MODES 1, 2, and 3. ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A. Swing DG DC electrical A.1 Restore DG DC 7 days power subsystem electrical power inoperable due to subsystem to performance of SR 3.8.4.3 OPERABLE status. or SR 3.8.6.6. OR One or more required Unit 2 DG DC electrical power subsystems inoperable. (continued) HATCH UNIT 1 3.8-26 HATC UNI 1 38-26Amendment No.

DC Sources - Operating 3.8.4 ACTIONS (continued) CONDITION REQUIRED ACTION COMPLETION TIME B. Required Unit 1 DG DC 8.1 Restore battery terminal 2 hours battery charger on one voltage to greater than subsystem inoperable, or equal to the minimum established OR float voltage. Required swing DG DC AND battery charger inoperable for reasons other than 8.2. Verify battery float Once per 12 hours Condition A. current is < 5 amps. AND 8.3 Restore battery 72 hours charger(s) to OPERABLE status. C. One Unit 1 DG DC C.1 Restore DC DC 12 hours electrical power subsystem electrical power inoperable for reasons subsystem to other than Condition B. OPERABLE status. OR Swing DG DC electrical power subsystem inoperable for reasons other than Condition A or B. (continued) HATCH UNIT 1 3.8-27 HATC UNI I 38-27Amendment No.

DC Sources - Operating 3.8.4 ACTIONS (continued) CONDITION REQUIRED ACTION COMPLETION TIME D. One or more required Unit 1 D.1 Restore battery terminal 2 hours station service DC battery voltage to greater than chargers on one subsystem or equal to the inoperable, minimum established float voltage. AND D.2. Verify battery float Once per 12 hours current is < 20 amps. AND D.3 Restore battery 72 hours charger(s) to OPERABLE status. E. One Unit 1 station service C.1 Restore required 12 hours DC battery on one battery to OPERABLE subsystem inoperable, status. F. One Unit 1 station service F.1 Restore station service 2 hours DC electrical power DC electrical power subsystem inoperable for subsystem to reasons other than OPERABLE status. Condition D or E. G. Required Action and G.1 Be in MODE 3. 12 hours Associated Completion Time of Condition A, B, C, AND D, E, or F not met. G.2 Be in MODE 4. 36 hours H. Two or more DC electrical H.I Enter LCO 3.0.3. Immediately power subsystems inoperable that result in a loss of function. HATCH UNIT 1 3.8-28 HATC UNI I 38-28Amendment No.

DC Sources - Operating 3.8.4 SURVEILLANCE REQUIREMENTS NOTE---------------- SR 3.8.4.1 through SR 3.8.4.3 are applicable only to the Unit 1 DC sources. SR 3.8.4.4 is applicable only to the Unit 2 DC sources. SURVEILLANCE FREQUENCY SR 3.8.4.1 Verify battery terminal voltage is greater than or In accordance with equal to the minimum established float voltage, the Surveillance Frequency Control Program SR 3.8.4.2 Verify each required battery charger supplies In accordance with > 400 amps for station service subsystems, and the Surveillance > 100 amps for DG subsystems at greater than or Frequency Control equal to the minimum established float voltage for Program > 1 hour. O__R Verify each battery charger can recharge the battery to the fully charged state within 24 hours while supplying the largest combined demands of the various continuous steady state loads, after a battery discharge to the bounding design basis event discharge state. SR 3.8.4.3-----------NOTES--------

1.

The modified performance discharge test in SR 3.8.6.6 may be performed in lieu of SR 3.8.4.3.

2.

This Surveillance shall not be performed in MODE 1, 2, or 3, except for the swing DG battery. However, credit may be taken for unplanned events that satisfy this SR. Verify battery capacity is adequate to supply, and In accordance with maintain in OPERABLE status, the required the Surveillance emergency loads for the design duty cycle when Frequency Control subjected to a battery service test. Program (continued) HATCH UNIT 1 3.8-29 HATC UNI 1 38-29Amendment No.

DC Sources - Operating 3.8.4 SURVEILLANCE REQUIREMENTS (continued) SURVEILLANCE FREQUENCY 4 SR 3.8.4.4 For required Unit 2 DC sources, the SRs of Unit 2 Specification 3.8.4 are applicable. In accordance with applicable SRs HATCH UNIT 1 3.8-30 HATC UNI I 38-30Amendment No.

DC Sources - Operating 3.8.4 3.8 ELECTRICAL POWER SYSTEMS 3.8.4 DC Sources - Operating LCO 3.8.4 The following DC electrical power subsystems shall be OPERABLE:

a.

The Unit 2 Division 1 and Division 2 station service DC electrical power subsystems;

b.

The Unit 2 and the swing DGs DC electrical power subsystems; and

c.

The Unit 1 DG DC electrical power subsystems needed to support the equipment required to be OPERABLE by LCO 3.6.4.3, "Standby Gas Treatment (SGT) System"; LCO 3.7.4, "Main Control Room Environmental Control (MCREC) System"; LCO 3.7.5, "Control Room Air Conditioning (AC) System"; and LCO 3.8.1, "AC Sources - Operating." APPLICABILITY: MODES 1, 2, and 3. ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A. Swing DG DC electrical A.1 Restore DG DC 7 days power subsystem electrical power inoperable due to subsystem to performance of SR 3.8.4.3 OPERABLE status. or SR 3.8.6.6. OR One or more required Unit 1 DG DC electrical power subsystems inoperable. (continued) HATCH UNIT 2 3.8-26 HATC UNI 2 38-26Amendment No.

DC Sources - Operating 3.8.4 ACTIONS (continued) CONDITION REQUIRED ACTION COMPLETION TIME B. Required Unit 2 DG DC B.1 Restore battery terminal 2 hours battery charger on one voltage to greater than or subsystem inoperable, equal to the minimum established float voltage. OR AND Required swing DG DC battery charger inoperable B.2 Verify battery float current Once per 12 hours for reasons other than is < 5 amps. Condition A. AND B.3 Restore battery 72 hours charger(s) to OPERABLE status. C. One Unit 2 DG DC C.1 Restore DG DC 12 hours electrical power subsystem electrical power inoperable for reasons subsystem to other than Condition B. OPERABLE status. OR Swing DG DC electrical power subsystem inoperable for reasons other than Condition A or B. (continued) HATCH UNIT 2 3.8-27 HATC UNI 2 38-27Amendment No.

DC Sources - Operating 3.8.4 ACTIONS (continued) CONDITION REQUIRED ACTION COMPLETION TIME D. One or more required Unit D.1 Restore battery terminal 2 hours 2 station service DC battery voltage to greater than chargers on one subsystem or equal to the inoperable, minimum established float voltage. AND D.2 Verify battery float Once per 12 hours current is < 20 amps. AND D.3 Restore battery 72 hours charger(s) to OPERABLE status. E. One Unit 2 station service E.1 Restore required 12 hours DC battery on one battery to OPERABLE subsystem inoperable, status. F. One Unit 2 station service F.1 Restore station service 2 hours DC electrical power DC electrical power subsystem inoperable for subsystem to reasons other than OPERABLE status. Condition D or E. G. Required Action and G.1 Be in MODE 3. 12 hours Associated Completion Time of Condition A, B, C, AND D, E, or F not met. G.2 Be in MODE 4. 36 hours H. Two or more DC electrical H.1 Enter LCO 3.0.3. Immediately power subsystems inoperable that result in a loss of function. HATCH UNIT 2 3.8-28 HATC UNI 2 38-28Amendment No.

DC Sources - Operating 3.8.4 SURVEILLANCE REQUIREMENTS NOTE---------------- SR 3.8.4.1 through SR 3.8.4.3 are applicable only to the Unit 2 DC sources. SR 3.8.4.4 is applicable only to the Unit 1 DC sources. SURVEILLANCE FREQUENCY SR 3.8.4.1 Verify battery terminal voltage is greater than or In accordance with equal to the minimum established float voltage, the Surveillance Frequency Control Program SR 3.8.4.2 Verify each required battery charger supplies In accordance with > 400 amps for station service subsystems, and the Surveillance > 100 amps for DG subsystems at greater than or Frequency Control equal to the minimum established float voltage for Program > 1 hour. OR Verify each battery charger can recharge the battery to the fully charged state within 24 hours while supplying the largest combined demands of the various continuous steady state loads, after a battery discharge to the bounding design basis event discharge state. SR 3.8.4.3-----------NOTES-

1.

The modified performance discharge test in SR 3.8.6.6 may be performed in lieu of the service test in SR 3.8.4.3.

2.

This Surveillance shall not be performed in MODE 1, 2, or 3, except for the swing DG battery. However, credit may be taken for unplanned events that satisfy this SR. Verify battery capacity is adequate to supply, and In accordance with maintain in OPERABLE status, the required the Surveillance emergency loads for the design duty cycle when Frequency Control subjected to a battery service test. Program (continued) HATCH UNIT 2 382 mnmn o 3.8-29 Amendment No.

DC Sources - Operating 3.8.4 SURVEILLANCE REQUIREMENTS (continued)________ SURVEILLANCE FREQUENCY SR 3.8.4.4 For required Unit 1 DC sources, the SRs of Unit 1 In accordance with Specification 3.8.4 are applicable, applicable SRs HATCH UNIT 2 3.8-30 HATC UNI 2 38-30Amendment No.

DC Sources - Shutdown 3.8.5 3.8 ELECTRICAL POWER SYSTEMS 3.8.5 DC Sources - Shutdown LCO 3.8.5 The following DC electrical power subsystems shail be OPERABLE:

a.

The Unit 1 DC electrical power subsystems needed to support the DC electrical power distribution subsystem(s) required by LCO 3.8.8, "Distribution Systems - Shutdown"; and

b.

The Unit 2 DG DC electrical power subsystems needed to support the equipment required to be OPERABLE by LCO 3.6.4.3, "Standby Gas Treatment (SGT) System"; and LCO 3.8.2, "AC Sources - Shutdown." MODES 4 and 5, During movement of irradiated fuel assemblies in the secondary containment. APPLICABILITY: ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A. One required battery A.1 Restore battery terminal 2 hours charger on one or more voltage to greater than required DG DC or equal to the

• subsystems inoperable, minimum established float voltage.

AND. AND The redundant subsystem battery and required A.2. Verify battery float Once per 12 hours chargers OPERABLE. current < 5 amps. AND A.3 Restore battery 72 hours charger(s) to OPERABLE status. (continued) HATCH UNIT 1 3.8-31 HATC UNI I 38-31Amendment No.

DC Sources - Shutdown 3.8.5 ACTIONS (continued)___________ CONDITION REQUIRED ACTION COMPLETION TIME B. One or more required B.1 Restore battery terminal 2 hours battery chargers on one voltage to greater than required station service DC or equal to the subsystem inoperable, minimum established float voltage. AND AND The redundant subsystem battery and required B.2 Verify battery float Once per 12 hours chargers OPERABLE. current < 20 amps. AND B.3 Restore battery 72 hours charger(s) to OPERABLE status. C. One or more required DG C.1 Declare affected Immediately or station service DC required feature(s) electrical power subsystems inoperable. inoperable for reasons other than Conditions A or B. OR OR C.2.1 Suspend CORE Immediately ALTERATIONS. Required Actions and associated Completion AND Times of Conditions A or B not met. C.2.2 Suspend movement of Immediately irradiated fuel assemblies in the secondary containment. AND C.2.3 Initiate action to Immediately suspend operations with a potential for draining the reactor vessel. (continued) HATCH UNIT 1 3.8-32 HATC UNI I 38-32Amendment No.

DC Sources - Shutdown 3.8.5 ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME C. (continued) AND C.2.4 Initiate action to restore Immediately required DC electrical power subsystems to OPERABLE status. SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY SR 3.8.5.1---------------------NOTE------------ The following SRs are not required to be performed: SR 3.8.4.2 and SR 3.8.4.3. For required Unit 1 DC sources, the following SRs In accordance with are applicable: applicable SRs SR 3.8.4.1 SR 3.8.4.2 SR 3.8.4.3 SR 3.8.5.2 For required Unit 2 DC sources, SR 3.8.5.1 of In accordance with Unit 2 Specification 3.8.5 is applicable. Unit 2 SR 3.8.5.1 HATCH UNIT 1 3.8-33 HATC UNI I 38-33Amendment No.

DC Sources - Shutdown 3.8.5 3.8 ELECTRICAL POWER SYSTEMS 3.8.5 DC Sources - Shutdown LCO 3.8.5 The following DC electrical power subsystems shall be OPERABLE:

a.

The Unit 2 DC electrical power subsystems needed to support the DC electrical power distribution subsystem(s) required by LCO 3.8.8, "Distribution Systems - Shutdown"; and

b.

The Unit 1 DG DC electrical power subsystems needed to support the equipment required to be OPERABLE by LCO 3.6.4.3, "Standby Gas Treatment (SGT) System"; and LCO 3.7.4, "Main Control Room Environmental Control (MCREC) System"; LCO 3.7.5, "Control Room Air Conditioning (AC) System"; and LCO 3.8.2, "AC Sources - Shutdown." MODES 4 and 5, During movement of irradiated fuel assemblies in the secondary containment. APPLICABILITY: ACTIONS_________________ CONDITION REQUIRED ACTION COMPLETION TIME A. One required battery A.1 Restore battery terminal 2 hours charger on one or more voltage to greater than required DG DC or equal to the subsystems inoperable, minimum established float voltage. AND AND The redundant subsystem battery and required A.2 Verify battery float Once per 12 hours chargers OPERABLE. current is < 5 amps. AND A.3 Restore battery 72 hours charger(s) to OPERABLE status. (continued) HATCH UNIT 2 3.8-31 HATC UNI 2 38-31Amendment No.

DC Sources - Shutdown 3.8.5 ACTIONS (continued)_________________________ CONDITION REQUIRED ACTION COMPLETION TIME B. One or more required B.1 Restore battery terminal 2 hours battery chargers on one voltage to greater than required station service DC or equal to the subsystem inoperable, minimum established float voltage. AND AND The required subsystem battery and required B.2 Verify battery float Once per 12 hours chargers OPERABLE. current < 20 amps. AND B.3 Restore battery 72 hours charger(s) to OPERABLE status. C. One or more required DG or C.1 Declare affected Immediately station service DC electrical required feature(s) power subsystems inoperable. inoperable for reasons other than Conditions A or B. OR OR C.2.1 Suspend CORE Immediately ALTERATIONS. Required Actions and associated Completion AND Times of Conditions A or B not met. C.2.2 Suspend movement of Immediately irradiated fuel assemblies in the secondary containment. AND ________________________(continued) HATCH UNIT 2 3.8-32 HATC UNI 2 38-32Amendment No.

DC Sources - Shutdown 3.8.5 ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME C. (continued) C.2.3 Initiate action to Immediately suspend operations with a potential for draining the reactor vessel. AND. C.2.4 Initiate action to restore Immediately required DC electrical power subsystems to OPERABLE status. SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY SR 3.8.5.1---------------------NOTE-------------- The following SRs are not required to be performed: SR 3.8.4.2 and SR 3.8.4.3. For required Unit 2 DC sources, the following SRs In accordance with are applicable: applicable SRs SR 3.8.4.1 SR 3.8.4.2 SR 3.8.4.3 SR 3.8.5.2 For required Unit 1 DC sources, SR 3.8.5.1 of In accordance with Unit 1 Specification 3.8.5 is applicable. Unit 1 SR 3.8.5.1 HATCH UNIT 2 3.8-33 HATC UNI 2 38-33Amendment No.

Battery Parameters 3.8.6 3.8 ELECTRICAL POWER SYSTEMS 3.8.6 Battery Parameters LCO 3.8.6 APPLICABILITY: Battery parameters for the station service and OG electrical power subsystem batteries shall be within limits. When associated DC electrical power subsystem is required to be OPERABLE. ACTIONS NOTE-Separate Condition entry is allowed for each battery. CONDITION REQUIRED ACTION COMPLETION TIME A. One DG or station service A.1 Perform SR 3.8.4.1. 2 hours battery on one subsystem with one or more battery AND cells float voltage < 2.07 V. A.2 Perform SR 3.8.6.1. 2 hours AND A.3 Restore affected cell 24 hours voltage > 2.07 V. B. One DG battery on one B.1 Perform SR 3.8.4.1. 2 hours subsystem with float current > 5 amps. AND B.2 Restore battery float 12 hours current to < 5 amps. C. One station service battery C.1 Perform SR 3.8.4.1. 2 hours on one subsystem with float current > 20 amps. AND C.2 Restore battery float 12 hours current to < 20 amps. (continued) HATCH UNIT 1 3.8-34 HATC UNI I 38-34Amendment No.

Battery Parameters 3.8.6 ACTIONS (continued) CONDITION REQUIRED ACTION COMPLETION TIME -~~NOTE--------------------NOTE----- Required Action D.2 shall be Required Actions D.1 and D.2 completed if electrolyte level was are only applicable if electrolyte below the top of plates. level was below the top of plates. D. One DG or station service battery on one subsystem D. 1 Restore electrolyte level 8 hours with one or more cells to above top of plates. electrolyte level less than minimum established AND design limits. D.2 Verify no evidence of 12 hours leakage. AND D.3 Restore electrolyte level 31 days to greater than or equal to minimum established design limits. E. One DG or station service E.1 Restore battery pilot cell 12 hours battery on one subsystem temperature to greater with pilot cell electrolyte than or equal to temperature less than minimum established minimum established design limits. design limits. F. One or more batteries in F.1 Restore battery 2 hours redundant subsystems with parameters for batteries battery parameters not in one subsystem to within limits, within limits. (continued) HATCH UNIT 1 3.8-35 HATC UNI I 38-35Amendment No.

Battery Parameters 3.8.6 ACTIONS (continued)_________________________ CONDITION REQUIRED ACTION COMPLETION TIME G. Required Action and G.1 Declare associated Immediately associated Completion battery inoperable. Time of Condition A, B, C, D, E, or F not met. O._R One DG battery on one subsystem with one or more battery cells float voltage < 2.07 V and float current > 5 amps. OR One station service battery on one subsystem with one or more battery cells float voltage < 2.07 V and float current > 20 amps. SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY SR 3.8.6.1------------NOTE------- Not required to be met when battery terminal voltage is less than the minimum established float voltage of SR 3.8.4.1. Verify each DG battery float current is < 5 amps In accordance with and each station service battery float current is the Surveillance < 20 amps. Frequency Control Program SR 3.8.6.2 Verify each DG and each station service battery In accordance with pilot cell float voltage is > 2.07 V. the Surveillance Frequency Control Program (continued) HATCH UNIT 1 3.8-36 HATC UNI I 38-36Amendment No.

Battery Parameters 3.8.6 SURVEILLANCE REQUIREMENTS (continued) SURVEILLANCE FREQUENCY SR 3.8.6.3 Verify each DG and each station service battery In accordance with connected cell electrolyte level is greater than or the Surveillance equal to minimum established design limits. Frequency Control Program SR 3.8.6.4 Verify each DG and each station service battery In accordance with pilot cell temperature is greater than or equal to the Surveillance minimum established design limits. Frequency Control Program SR 3.8.6.5 Verify each DG and each station service battery In accordance with connected cell float voltage is > 2.07 V. the Surveillance Frequency Control Program SR 3.8.6.6---------------------NOT------------ This Surveillance shall not normally be performed in MODE 1, 2, or 3. However, credit may be taken for unplanned events that satisfy this SR. Verify DG and station service battery capacity is In accordance with > 80% of the manufacturer's rating when the Surveillance subjected to a performance discharge test or a Frequency Control modified performance discharge test. Program HATCH UNIT 1 3.8-37 HATC UNI 1 38-37Amendment No.

Battery Parameters 3.8.6 3.8 ELECTRICAL POWER SYSTEMS 3.8.6 Battery Parameters LCO 3.8.6 APPLICABILITY: Battery parameters for the station service and DG electrical power subsystem batteries shall be within limits. When associated DC electrical power subsystem is required to be OPERABLE. ACTIONS NOTE--- Separate Condition entry is allowed for each battery. CONDITION REQUIRED ACTION COMPLETION TIME A. One DG or station service A.1 Perform SR 3.8.4.1. 2 hours battery on one subsystem with one or more battery AND cells float voltage < 2.07 V. A.2 Perform SR 3.8.6.1. 2 hours AND A.3 Restore affected cell 24 hours voltage > 2.07 V. B. One DG battery on one B.1 Perform SR 3.8.4.1. 2 hours subsystem with float current > 5 amps. AND B.2 Restore battery float 12 hours current to < 5 amps. C. One station service battery C.1 Perform SR 3.8.4.1. 2 hours on one subsystem with float current > 20 amps. AND C.2 Restore battery float 12 hours current to < 20 amps. (continued) HATCH UNIT 2 3.8-34 HATC UNI 2 38-34Amendment No.

Battery Parameters I 3.8.6 ACTIONS (continued)__________________________ CONDITION REQUIRED ACTION COMPLETION TIME -NOTE-----------NOTE-............ Required Action D.2 shall be Required Actions D.1 and D.2 completed if electrolyte level was are only applicable if electrolyte below the top of plates. level was below the top of plates. D. One DG or station service battery on one subsystem D.1 Restore electrolyte level 8 hours with one or more cells to above top of plates. electrolyte level less than minimum established AND design limits. D.2 Verify no evidence of 12 hours leakage. AND D.3 Restore electrolyte level 31 days to greater than or equal to minimum established design limits. E. One DG or station service E.1 Restore battery pilot 12 hours battery on one subsystem cell temperature to with pilot cell electrolyte greater than or equal to temperature less than minimum established minimum established design limits. design limits. F. One or more batteries in F.1 Restore battery 2 hours redundant subsystems with parameters for batteries battery parameters not in one subsystem to within limits, within limits. (continued) HATCH UNIT 2 3.8-35 HATC UNI 2 38-35Amendment No.

Battery Parameters 3.8.6 ACTIONS (continued) CONDITION REQUIRED ACTION COMPLETION TIME G. Required Action and G.1 Declare associated Immediately associated Completion battery inoperable. Time of Condition A, B, C, D, E, or F not met. OR One DG battery on one subsystem with one or more battery cells float voltage < 2.07 V and float current > 5 amps. OR One station service battery on one subsystem with one or more battery cells float voltage < 2.07 V and float current > 20 amps. SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY SR 3.8.6.1--------------------NOTE-------------- Not required to be met when battery terminal voltage is less than the minimum established float voltage of SR 3.8.4.1. Verify each DG battery float current is < 5 amps In accordance with and each station service battery float current is < the Surveillance 20 amps. Frequency Control Program SR 3.8.6.2 Verify each DG and each station service battery In accordance with pilot cell float voltage is > 2.07 V. the Surveillance Frequency Control Program (continued) HATCH UNIT 2 3.8-36 HATC UNI 2 38-36Amendment No.

Battery Parameters 3.8.6 SURVEILLANCE REQUIREMENTS (continued)________ SURVEILLANCE FREQUENCY SR 3.8.6.3 Verify each DG and each station service battery In accordance with connected cell electrolyte level is greater than or the Surveillance equal to minimum established design limits. Frequency Control Program SR 3.8.6.4 Verify each DG and each station service battery In accordance with pilot cell temperature is greater than or equal to the Surveillance minimum established design limits. Frequency Control Program SR 3.8.6 5 Verify each DG and each station service battery In accordance with connected cell float voltage is > 2.07 V. the Surveillance Frequency Control Program SR 3.8.6.6--------------------NOTE-------------- This Surveillance shall not normally be performed in MODE 1, 2, or 3. However, credit may be taken for unplanned events that satisfy this SR. Verify DG and station service battery capacity is > In accordance with 80% of the manufacturer's rating when subjected the Surveillance to a performance discharge test or a modified Frequency Control performance discharge test. Program HATCH UNIT 2 3.8-37 HATC UNI 2 38-37Amendment No.

Programs and Manuals 5.5 5.5 Programs and Manuals 5.5.14 Control Room Envelope Habitability Progqram (continued) Frequencies specified in Sections 0.1 and 0.2 of Regulatory Guide 1.197, Revision 0.

d.

Measurement, at designated locations, of the ORE pressure relative to all external areas adjacent to the ORE boundary during the pressurization mode of operation by one subsystem of the MOREC System, operating at the flow rate required by the VFTP, at a Frequency of 24 months on a STAGGERED TEST BASIS. The results shall be trended and used as part of the 24 month assessment of the ORE boundary.

e.

The quantitative limits on unfiltered air inleakage into the ORE. These limits shall be stated in a manner to allow direct comparison to the unfiltered air inleakage measured by the testing described in paragraph c. The unfiltered air inleakage limit for radiological challenges is the inleakage flow rate assumed in the licensing basis analyses of DBA consequences. Unfiltered air inleakage limits for hazardous chemicals must ensure that exposure of ORE occupants to these hazards will be within the assumptions in the licensing basis.

f.

The provisions of SR 3.0.2 are applicable to the Frequencies for assessing ORE habitability, determining ORE unfiltered inleakage, and measuring ORE pressure and assessing the ORE boundary as required by paragraphs c and d, respectively. 5.5.15 Battery Monitoringq and Maintenance Proqram This program provides controls for battery restoration and maintenance. The program shall be in accordance with IEEE Standard (STO) 450-2002, "IEEE Recommended Practice for Maintenance, Testing, and Replacement of Vented Lead-Acid Batteries for Stationary Applications," as endorsed by Regulatory Guide 1.129, Revision 2 (RG), with RG exceptions and program provisions as identified below:

a.

The program allows the following RG 1.129, Revision 2 exceptions:

1)

Battery temperaturecorrection may be performed before or after conducting discharge tests.

2)

RG 1.129, Regulatory Position 1, Subsection 2, "References," is not applicable to this program. 3). In lieu of RG 1.129, Regulatory Position 2, Subsection 5.2, "Inspections," the following shall be used: "Where reference is made to the pilot cell, pilot cell selection shall be based on the lowest voltage cell in the battery." HATCH UNIT I 5.0-18 Amendment No. HATCH UNIT 1 5.0-18 Amendment No.

Programs and Manuals 5.5 5.5 Programs and Manuals 5.5.15 Battery Monitoringq and Maintenance Progqram (continued)

4)

In Regulatory Guide 1.129, Regulatory Position 3, Subsection 5.4.1, "State of Charge Indicator," the following statements in paragraph (d) may be omitted: "When it has been recorded that the charging current has stabilized at the charging voltage for three consecutive hourly measurements, the battery is near full charge. These measurements shall be made after the initially high charging current decreases sharply and the battery voltage rises to approach the charger output voltage."

5)

In lieu of RG 1.129, Regulatory Position 7, Subsection 7.6, "Restoration", the following may be used: "Following the test, record the float voltage of each cell of the string."

b.

The program shall include the following provisions:

1)

Actions to restore battery cells with float voltage < 2.13 V;

2)

Actions to determine whether the float voltage of the remaining battery cells is > 2.13 V when the float voltage of a battery cell has been found to be < 2.13 V;

3)

Actions to equalize and test battery cells that had been discovered

• with electrolyte level below the top of the plates;

4)

Limits on average electrolyte temperature, battery connection resistance, and battery terminal voltage; and

5)

A requirement to obtain specific gravity readings of all cells at each discharge test, consistent with manufacturer recommendations. HATCH UNIT 1 5.0-19 HATC UNI I 50-19Amendment No.

Programs and Manuals 5.5 5.5 Programs and Manuals 5.5.14 Control Room Envelope Habitability Pro qram (continued) Frequencies specified in Sections 0.1 and 0.2 of Regulatory Guide 1.197, Revision 0.

d.

Measurement, at designated locations, of the CRE pressure relative to all external areas adjacent to the ORE boundary during the pressurization mode of operation by one subsystem of the MOREC System, operating at the flow rate required by the VFTP, at a Frequency of 24 months on a STAGGERED TEST BASIS. The results shall be trended and used as part of the 24 month assessment of the ORE boundary.

e.

The quantitative limits on unfiltered air inleakage into the ORE. These limits shall be stated in a manner to allow direct comparison to the unfiltered air inleakage measured by the testing described in paragraph c. The unfiltered air inleakage limit for radiological challenges is the inleakage flow rate assumed in the licensing basis analyses of DBA consequences. Unfiltered air inleakage limits for hazardous chemicals must ensure that exposure of ORE occupants to these hazards will be within the assumptions in the licensing basis.

f. The provisions of SR 3.0.2 are applicable to the Frequencies for assessing ORE habitability, determining ORE unfiltered inleakage, and measuring ORE pressure and assessing the ORE boundary as required by paragraphs c and d, respectively.

5.5.15 Battery Monitorinq and Maintenance Progqram This program provides controls for battery restoration and maintenance. The program shall be in accordance with IEEE Standard (STO) 450-2002, "IEEE Recommended Practice for Maintenance, Testing, and Replacement of Vented Lead-Acid Batteries for Stationary Applications," as endorsed by Regulatory Guide 1.129, Revision 2 (RG), with RG exceptions and program provisions as identified below:

a.

The program allows the following RG 1.129, Revision 2 exceptions:

1)

Battery temperature correction may be performed before or after conducting discharge tests.

2)

RG 1.129, Regulatory Position 1, Subsection 2, "References," is not applicable to this program.

3)

In lieu of RG 1.129, Regulatory Position 2, Subsection 5.2, 'Inspections,' the following shall be used: 'Where reference is made to the pilot cell, pilot cell selection shall be based on the lowest voltage cell in the battery.' HATCH UNIT 2 5.0-18 HATC UNI 2 50-18Amendment No.

Programs and Manuals 5.5 5.5 Programs and Manuals 5.5.15 Battery Monitoring and Maintenance Proqram (continued)

4)

In Regulatory Guide 1.129, Regulatory Position 3, Subsection 5.4.1, "State of Charge Indicator," the following statements in paragraph (d) may be omitted: "When it has been recorded that the charging current has stabilized at the charging voltage for three consecutive hourly measurements, the battery is near full charge. These measurements shall be made after the initially high charging current decreases sharply and the battery voltage rises to approach the charger output voltage."

5)

In lieu of RG 1.129, Regulatory Position 7, Subsection 7.6, "Restoration", the following may be used: "Following the test, record the float voltage of each cell of the string."

b.

The program shall include the following provisions:

1)

Actions to restore battery cells with float voltage < 2.13 V;

2)

Actions to determine whether the float voltage of the remaining battery cells is > 2.13 V when the float voltage of a battery cell has been found to be < 2.13 V.

3)

Actions to equalize and test battery cells that had been discovered with electrolyte level below the top of the plates;

4)

Limits on average electrolyte temperature, battery connection resistance, and battery terminal voltage; and

5)

A requirement to obtain specific gravity readings of all cells at each discharge test, consistent with manufacturer recommendations. HATCH UNIT 2 5.0-19 HATC UNI 2 50-19Amendment No.

Edwin I. Hatch Nuclear Plant - Units 1 and 2 License Amendment Request for Adoption of Technical Specifications Task Force (TSTF) Traveler TSTF-500, Revision 2, "DC Electrical Rewrite - Update To TSTF-360". Letter From Battery Vendor, C&D Technologies, Verifying the Acceptability of Using Float Current Monitoring

mTIcHNOIOGIES, INC. Powpr Soluigona 1400 Union Meeting Road Blue Bell, PA 19422 Phone: (215) 775-1314 Fax: (215) 619-7887 Sent via Email to: X2FLOYDtasouthernco.com April 25, 2012 Mr. Kyle Floyd Southern Nuclear Operating Company

Subject:

Hatch Nuclear Plant - Using Float Current for State of Charge

Dear Kyle:

In regards to the C&D battery models KCR, LCR and LCY in safety related (Class l-E) applications at Plant Hatch, it is acceptable to use float current monitoring instead of specific gravity monitoring as a reliable and accurate indication of the state of charge of the battery. This relationship remains valid for the life of these batteries. I hope that this information meets your needs. If you require any additional information, please contact me.

Regards, Larry A. Carson Nuclear Product Manager C&D Technologies, Inc.

Edwin I. Hatch Nuclear Plant - Units 1 and 2 License Amendment Request for Adoption of Technical Specifications Task Force (TSTF) Traveler TSTF-500, Revision 2, "DC Electrical Rewrite - Update To TSTF-360". Evaluation Supporting a CT Longer Than 2 Hours for Specification 3.8.4, Required Action 3.8.4.E

Enclosure. 2 to NL-14-0649 Description of Probabilistic Risk Analysis Evaluation of Risk Impact The overall risk evaluation for this proposed completion time extension for each inoperable Plant Hatch Station Service Battery is based on the following three-tier approach described in Regulatory Guide 1.177: Tier 1: PRA Capability and Insights Tier 2: Avoidance of Risk-Significant Plant Configurations, and Tier 3: Risk-Informed Configuration Risk Management

1. Tier 1.: PRA Capability and Insights The quantified risk impact associated with this proposed Station Service Battery completion time extension was evaluated using the Plant Hatch Unit 1 Revision 4 PRA Average Risk Model. Results from this model are directly applied to Unit 2 because of the high degree of similarity between Hatch Plant units.

Evaluations for risk associated with this proposed amendment were performed using the following: Internal Events (including Internal Flooding) using the Plant Hatch Average Risk Model Internal Fires Seismic Events Low Power/Shutdown Risk discussed qualitatively Other External Events The guidance documented in Regulatory Guide 1.177 was used to evaluate the risk impact of the requested 12 hour completion time for each Plant Hatch Station Service Battery. Definitions AtCDF = CDF(TSTF-S00 Case) - CDF(Base) ACD F This value shows the difference or change in average quantified Core Damage Frequency based on new values for Station Service Battery maintenance unavailability as opposed to the presently used values. This value is designed to show the average risk difference in increasing the completion time for each Station Service Battery from its present value of approximately 1 hour to 12 hours. CDF(TSTF-500 Case) This value is the quantified average Core Damage Frequency considering the new Station Service Battery maintenance unavailabilities. The new Station Service Battery maintenance term considers the potential for battery work being done while the units are "at Power." E2-1 to NL-14-0649 Description of Probabilistic Risk Analysis CDF(Base) This value is the average Core Damage Frequency quantified using the present Station Service Battery maintenance unavailabilites. ALERF = LERF(TSTF-500 Case) - LERF(Base)

• &LERF This value shows the difference or change in average quantified Large Early Release Frequency based on new values for Station Service Battery maintenance unavailability as opposed to the presently used values. This value is designed to show the average risk difference in increasing the completion time for each Station Service Battery from its present value of approximately 1 hour to 12 hours.

LERF(TSTF-500 Case) This value is the quantified average Large Early Release Frequency considering the new Station Service Battery maintenance unavailabilities. The new Station Service Battery maintenance term considers the potential for battery work being done while the units are "at Power." LERF(Base) This value is the average Large Early Release Frequency quantified using the present Station Service Battery maintenance unavailabilites. E2-2 toN L-14-0649 Description of Probabilistic Risk Analysis Internal Events and Internal Flooding Considerations To determine the risk associated with the extended CT for the Station Service Battery, the Hatch PRA "At Power" model was used. In order to perform a risk evaluation, the unavailability hours for each station service battery were increased to 12 hours. The following results were obtained. Ul U2 Base Case TSTF-500 Case Delta Base Case TSTF-500 Case Delta CDF 7.9796E-06 7.9091E-06 7.05E-O8 7.3351E-06 7.4022E-06 6.71E-08 LERF 1.1358E-06 1.1428E-06 7.O0E-09 1.0348E-06 1.0418E-06 7.00E-09 Fire Risk Contribution Plant Hatch does not have a Fire PRA model that can be used for risk-informed applications. A draft Unit 1 model is available but the large number of open peer review comments prevents direct use of model results. To determine order of magnitude bounding conditions, the Unit 1 pre-generated cutsets available from the Fire PRA peer review were used to evaluate relative risk increases due to changes in the battery failure rates. The results showed that the change in fire risk is about half of the internal events risk. It is believed that resolution of the open items will result in a fire risk approximately two to three times the internal events risk. Based on the above insights, and because the delta CDF from internal events PRA is very small, it is conservatively assumed that fire risk contribution is three times as much as the internal events (including internal flooding) risk. Therefore, the bounding delta CDF due to internal fires would be 2.12E-07 for Unit 1 and 2.01E-07 for Unit 2. The delta CDF for fire is 2.12E-7 for Unit :1 and 2.0O1E-07 for Unit 2. The delta LERF for fire is 2.1OE-8 for Unit 1 and Unit 2. E2-3 to NL-14-0649 Description of Probabilistic Risk Analysis Seismic Risk Contribution Currently, HNP does not have a Seismic PRA model. To estimate the Seismic risk contribution, the following methodology was used: NUREG-1488 gives the seismic initiating event frequencies for each nuclear plant in the US. NUREG/CR-4840 provides fragility curves for various components and a methodology to combine the seismic hazard probabilities with the seismic fragility probabilities to get conditional probabilities of component failures given different seismic accelerations. Frequencies of Seismically-Induced LOOP Events for SPAR Models, a paper which estimates values for seismic LOOPs (accession number ML062540239 in ADAMS), indicates a value of 4.2E-5/yr is appropriate for Hatch. This value is mentioned in Table 1 Frequencies of Seismically-Induced LOOP Events of RASP Handbook (Volume 2, Version 1.01, ML080300179). The value 4.2E-05 is derived by multiplying 6.13E-04 (seismic initiating event frequency) with 6.83E-02 (Conditional probability of LOSP due to seismic event). In a simplistic approach, a CCDP (due to LOSP) is multiplied to obtain delta CDF or delta LERF. However, a detailed conservative evaluation was performed in which ground acceleration is divided into three bins with each bin having different seismic initiating event frequency and conditional probability of LOSP due to seismic event. The internal evens (including internal flooding) PRA model was used to determine seismic risk contribution. Because seismic LOSPs are not considered to be recoverable in the short or medium term, the model was quantified by setting these events to True. The delta CDF was obtained by using the following formula for each bin. The total CDF due to seismic was obtained by adding individual delta CDF obtained from each bin. Similar process was used to calculate delta LERF. Delta CDF = seismic initiating event frequency

• conditional probability of LOSP due to seismic event
• delta CCDP from the internal events
• Estimation of Seismic Risk Contribution for Unit 1 delta CDF is 1.68E-12 Estimation of Seismic Risk Contribution for Unit 1 delta LERF is 1.61E-13 Estimation of Seismic Risk Contribution for Unit 2 delta CDF is 1.68E-12 Estimation of Seismic Risk Contribution for Unit 2 delta LERF is 2.57E-14 E2-4 to NL-14-0649 Description of Probabilistic Risk Analysis Other External Events Risk Contribution The risk contribution from a tornado is treated as a tornado induced LOSP. The switchyard structures and incoming transmission lines are constructed to NESC wind and ice loading requirements as described in FSAR chapter 8. The wind design for Hatch is 130 MPH, which is equivalent to an F3 or greater tornado. NUREG/CR-4461 provides an updated method of calculating the probability of a tornado with winds exceeding this amount striking the switchyard (approximately 1 sq km in size).

Using this method results in a tornado induced LOSP probability of 3.35E-06. The delta CDF was obtained by using the following formula. Delta CDF = (Delta LOSP/Normal LOSP)

• F3 or greater Tornado Frequency Estimation of Risk Contribution for Unit 1 delta CDF is 1,41E-13

.Estimation of Risk Contribution for Unit 1 delta LERF is 1,35E-14 Estimation of Risk Contribution for Unit 2 delta CDF is 1,41E-13 Estimation of Risk Contribution for Unit 2 delta LERF is 2,15E-15 E2-5 to NL-14-0649 Description of Probabilistic Risk Analysis Low Power/Shutdown Risk The AOT increase request for the Station Service Batteries is not applicable to operation Mode 4 (cold shutdown) and Mode 5 (refuel). Therefore, these operational conditions will not be evaluated. The Internal Events review, although it considers Mode 1 or the "at Power" case, bounds Mode 2 (Startup/Hot Standby) and Mode 3 (Hot Shutdown). In these cases, the reactor can be cold (just above 2120 F) or in excess of 500 psig; each case, however, considers the shutdown reactor. Shutdown reactor water systems such as condensate are abundant. Their redundancy, required to keep an operating reactor at 100%, makes this so. Consideration of the low pressure cases shows that there are several motor driven pumps capable of supplying the vessel with water. For the high pressure cases, there is an extra reactor feed pump, HPCI, RCIC, or the condensate booster pumps--the service of which depends on the particular reactor pressure. The transition from the high pressure to low pressure sources is by normal means and is the same that is modeled in the PRA for Mode 1. The overall difference is that there is a longer time frame allowed for the depressurization because power or decay heat is not as demanding as in the "at Power" model. Level control is an important consideration for shutdown as well as for the operating reactor. The shutdown cases tend to be less severe, however, because decay heat (or even the potential for approximately 5% reactor power in Mode 2) does not demand the full function of the systems under consideration as in the "at Power" case. LOCAs, which tend to pose the most restrictive level control problems, are normally evaluated for a pressurized system which means that most of the time the consideration is for the "at Power" condition. The time a shutdown reactor is pressurized is short compared to the time at power. LOCA is possible during a depressurized condition, but it would tend to be caused by valve misalignment or operator error more so than actual pipe rupture. This type of event typically has more evaluation time and a longer time frame for recovery than at-power LOCAs, and the problem is corrected prior to catastrophic core damage. The overall LOCA initiating event frequencies are reasonably small (E-04 to E-05) for the range of LOCAs considered and are not a significant contribution during the shutdown or full power case. The LERF condition is not as significant in Modes 2 and 3 because of the low reactor power. In order to have LERF, there needs to be core damage as well as a release of the damaged core to primary containment and ultimately to the environment. The availability of sources to cover the core in the low power condition has previously been discussed. The n'ext phase of the LERF condition should water sources fail, however, is release of this damaged product to primary containment or out via a failed isolation pathway. If the material does not get into primary containment, the capability to penetrate the containment via some failure mode such as overpressure is such that the time frame involved would no longer make it an Early Release. This does not take into account the availability of sources for containment cooling or pressure control. E2-6 to NL-14-0649 Description of Probabilistic Risk Analysis In consideration of failed containment isolation, it is possible that the main steam isolation valves may be closed already due to the operational variations involved in startup and hot shutdown; therefore, in these states their probability of failure to close would be less. HPCI and RCIC steam line isolations could be treated in a similar fashion as the MSIV's; however as the steam line low pressure alarms cleared, they would be opened. Their failure to close would provide a high energy pathway. If, however, all sources of core coverage failed and a HPCI or RCIC steam line failed to isolate, the actual release rate would decrease rapidly because the motive force (i.e. the steam pressure attributed to low power or decay heat) would not last. This plus the holdup time involved with the reactor building would severely retard the LERF capabilities of such scenarios. In the shutdown or startup conditions, not only are more physical attributes available to prevent core damage, the number of initiating event contributions are less. One such example is the case with the Anticipated Transient Without Scram (ATWS). Losses of condenser vacuum and feedwater or MSIV closure are not as severe or they would be at power. These accidents have their most significant contributions when these Balance of Plant (BOP) systems are required to keep the unit operating. Failure of these systems limits the use of the condenser as a heat sink and the use of high pressure feedwater injection. During the shutdown or startup condition, failure of these systems or functions would tend to be more of an inconvenience to operation than a threat to core damage. Reactor scram is not considered for the Mode 3 case but is for Mode 2, but even this would be a very low power event. 'The main events to consider would be LOSP or Loss of Electrical Bus cases. These events tend to take away the redundancy associated with extra systems during the non "at Power" case. In general, Modes 2 and 3 are not normally sustained. Mode 2 is the startup case. Transition through this mode can certainly be more than a few hours, but it is not designed as a convenient holding point to perform various activities without going to cold shutdown. It is an allowance for the physical restrictions of control rod manipulation during startup (and certain Refuel Mode cases) and maintenance on Station Service Batteries would be an administrative hindrance. Use of Mode 2 is controlled by Technical Specifications and procedures. Mode 3 is a unique end state that accounts for any requirements to end full power operation. It is convenient to perform certain required maintenance in this condition in order to save time restoring the unit to full power operation from cold shutdown (Mode 4). It is possible to enter this condition by necessity during the time that a Station Service Battery is undergoing maintenance on an extended completion time. The transition into Mode 3 for those unique times when a Battery is already in maintenance while in Mode 1 are still low risk as discussed previously. E2-7 to NL-14-0649 Description of Probabilistic Risk Analysis Summary of results from each contribution Unit 1 Unit 2 Unit 1 Unit 2 Risk Delta CDF Delta LERF Delta CDF Delta LERF Internal Events PRA 7.05E-08 7.00E-09 6.71E-08 7.00E-09 Fire 2.12 E-07 2.10E-08 2.01E-07 2.10E-08 Seismic 1.68E-12 1.61E-13 1.68E-12 2.57E-14 Other External Events 1.41E-13 1.35E-14 1.41E-13 2.15E-15 Shutdown Bounded by Internal Events PRA Total 2.83E-07 2.80E-08 2.68E-07 2.80E-08 Regulatory Guide 1.177 acceptance guidelines specify that a permanent TS CT change may be classified as having a small quantitative impact on plant risk if it has a delta CDF of less than 1.0E-06 and a delta LERF of less than 1.0E-07. The delta CDF and delta LERF for all cases are within the acceptable criteria. Therefore, the acceptance guidelines for Regulatory Guide 1.177 are satisfied. E2-8 to NL-14-0649 Description of Probabilistic Risk Analysis

2. Tier 2: Avoidance of Risk-Significant Plant Configurations Avoidance of Risk Significant Plant Configurations is accomplished by the Plant Hatch Maintenance Scheduling and Risk Assessment process. Maintenance on components, planned and emergent, is assessed on a probabilistic perspective as wel'l as a deterministic one. No restrictions are proposed concerning the use of the 12 hour AOT on the station service battery. However, maintenance is assessed at Plant Hatch using a computerized On-Line Risk Monitor. Color coded risk categories are employed to recognize and gage the plant risk for a particular plant configuration. The increasing risk, from GREEN to RED, requires correspondingly increasing higher management levels of approval, as listed in the next section. Hatch Risk Assessment procedures also contain provisions for Risk Management Actions to alleviate potentially risk significant plant configurations, should this be necessary.

3. Tier 3: Risk-Informed Configuration Risk Management The following discussion focuses on a description of the 10 CFR 50.65(a)(4) program which will be used to support the requested AOT.

Hatch presently manages risk with a procedurally controlled program that governs the scheduling of maintenance activities. This program involves review from a probabilistic and/or deterministic standpoint of all, planned and unplanned, maintenance activities and is effective for all modes of operation. Maintenance is normally assessed from a probabilistic standpoint using a computerized On-Line Risk Monitor. Each plant uses the EPRI sponsored software called Equipment Out of Service (EOOS) to quantify results. In cases where a quantitative solution is not possible because the functions or systems under consideration are not modeled, a qualitative assessment is used. Under certain risk significant conditions, both quantitative and qualitative assessments are required. Risk frequencies are related to a color code that responds to a certain managerial level for approval. The following chart shows a typical color code concept. Risk Action Level On-Line Maintenance Forced Outage Refueling Outage Green (None) Shift Supervisor Shift Supervisor Shift Supervisor Yellow (Low Risk) Superintendent of Shift Superintendent of Shift Outage Director or Unit Superintendent or Unit Superintendent Orange (Medium Risk) Manager-Operations or Manager-Operations or Outage and Assistant General Assistant General Maintenance Manager Manager-Plant Manager-Plant or Assistant General Operations Operations Manager-Plant Operations Red (High Risk) General Manager-General Manager-General Manager-Nuclear Plant Nuclear Plant Nuclear Plant E2-9 to NL-14-0649 Description of Probabilistic Risk Analysis Maintenance rule functions are evaluated to the component level by EOOS. The Hatch plant uses a configuration risk management procedure to evaluate and manage the risk of maintenance. Guidance from the procedure and NUMARC 93-01 is used to set risk threshold colors. If planned maintenance, unplanned maintenance, or a combination of both produces a non-green color, a documented evaluation of the situation is necessary and risk management actions are required. Red color situations are typically not approved as planned maintenance. If unplanned events place the plant in this situation, all maintenance activities focus on exiting the situation as soon as possible. All attempts are made to address all maintenance rule functions from either a direct quantification standpoint orone that is less direct. Certain functions are not specifically part of the EOOS/PRA quantitative model, but are modeled for equipment out of service purposes on the EOOS Operator's Screen status panel. Depending on the color codes generated when portions or all of one or more of these specific functions are removed from service, selected Initiating Event frequencies are temporarily increased to account for the degraded condition. This is conservative, yet it allows for evaluating these situations against modeled components that likewise may be removed from service. Additionally, selected Initiating Event frequencies are increased with the aid of EOOS software based on selected external conditions. Battery maintenance falls under the previously mentioned process at the present time. Conclusion The proposed extension of the Station Service Battery completion time is consistent with NRC policy and will continue to provide adequate protection of public health. Therefore, the proposed changes are acceptable. 3.1 Technical Adequacy of the PRA PRA Maintenance and Update The SNC PRA Configuration Control process is controlled by Risk-Informed Engineering procedures and ensures that the applicable PRA model remains an accurate reflection of the as-built and as-operated units. The SNC PRA Configuration Control process also delineates the responsibilities and guidelines for updating the full power internal events PRA models at all operating sNc nuclear generation sites. The overall SNC PRA Configuration Control process defines the expectations for implementing regularly scheduled and interim PRA model updates, for tracking issues identified as potentially affecting the PRA models (e.g., due to changes in the plant, errors or limitations identified in the model, industry operational experience), and for controlling the model and associated computer files. To ensure that the current PRA model remains an accurate reflection of the as-built, as-operated E2-10 to NL-14-0649 Description of Probabilistic Risk Analysis plant, the HNP PRA model has been updated according to the requirements defined in the SNC Configuration Control Process: Modifications to the physical plant shal! be reviewed to determine the scope and necessity of a revision to the baseline model on an ongoing basis.

• Pertinent modifications to plant procedures and Technical Specifications shall be reviewed, at a minimum, annually for changes which are of statistical significance to the results of the BL-PRA and those changes documented. Reliability data, failure data, initiating events frequency data, human reliability data, and other such PRA inputs shall be reviewed approximately every two fuel cycles.
• BL-PRAs may be updated to reflect germane changes in methodology, phenomenology, and regulation as judged to be prudent by the PRA Models and Tools Supervisor, Risk-Informed Engineering Subject Matter Experts, or as required by regulation.
• A Peer Review, either full or focused scope, shall be performed per the requirements of the current ASME-ANS PRA standard for such changes that meet one of the following criteria for a "PRA upgrade" (from the Standard for Level 1/Large Early Release Frequency Probabilistic Risk Assessment for Nuclear Power Plant Applications):

o New methodology o Change in scope that impacts the significant accident sequences or the significant accident progression sequences o Change in capability that impacts the significant accident sequences or the significant accident progression sequences

• If model updates require changes that are considered a "PRA upgrade", a Peer Review shall be performed prior to using the upgraded BL-PRA in support of any Risk Informed Application. The scope of the peer review may be limited/focused to the specific areas of the PRA that have been upgraded. Alternatively, the potential impact of not performing the peer review will be addressed as part of the Application.
• Any of the above changes deemed to be "Quantitatively Significant" (criteria listed in the PRA Configuration Control procedures) require the affected model to be updated as soon as possible. Other changes are to be made at a schedule determined by the Risk Informed Engineering Manager.

In addition to these activities, SNC Risk-Informed Engineering procedures provide the guidance for particular risk management and PRA quality and maintenance activities. This guidance includes: Documentation of the PRA model, PRA products, and bases document. E2-11 to NL-14-0649 Description of Probabilistic Risk Analysis

• The approach for controlling electronic storage of Risk Management (RM) products including PRA update information, PRA models, and PRA applications.
• Guidelines for updating th~e full power, internal events PRA models for SNC nuclear generation sites.
• Guidance for use of quantitative and qualitative risk models in support of the Configuration Risk Management Program for risk evaluations for maintenance tasks (corrective maintenance, preventive maintenance, minor maintenance, surveillance tests and'modifications) on systems, structures, and components (SSCs) within the scope of the Maintenance Rule (10 CFR 50.65 (a)(4)).

In accordance with this guidance, regularly scheduled PRA model updates nominally occur on an approximate three year cycle; however, longer intervals may be justified if it can be shown that the PRA continues to adequately represent the as-built, as-operated plant. Table 1 shows the brief history of the major HNP PRA model updates. E2-12 to NL-14-0649 Description of Probabilistic Risk Analysis Table 1: History of the Major Hatch PRA Model Updates Model Document No. Scope Updated Items CDF and LERF (Iyr) IPE Generic Letter 88-20 At-power, internal The originai ODE: 2.1 E-5 Response, Individual and external, CDF Plant Examination and Level 2 PRA. LERF: 4.7E Submittal Plant Hatch Units 1 and 2 December 11, 1992 Rev. 0 SNC-H1 002-005 At-power, internal, Conversion from RISKMAN CDF: 1.22E-5 Notebooks prepared ODE and LERF. Event Tree model to a CAFTA by PLG Fault Tree model LERE: 2.2E-6 The ODE reduction was due to updating initiating event frequencies, splitting Loss of Feedwater into two events (one based on loss of condensate system-one not). The LERE reduction was due to the use of a more simplified LERF model. Rev. 1 PSA-H-00-024 Rev. At-power, internal, CAFTA model changes from ODE: 1.24E-5; LERF: 2.20E-6 1la May 2001 ODE and LERF. Rev. 0 The change in ODE was due to a correction in the Mutually Exclusive file that had incorrectly removed a valid cutset. E2-13 to NL-14-0649 Description of Probabilistic Risk Analysis Table 1: History of the Major Hatch PRA Model Updates Model Document No. Scope Updated Items CDF and LERF (Iyr) Rev. 2 PRA-BC-H-05-003 At-power, internal, The first HNP PRA Peer Review ODE: 8.3E-6 ODF and LERF. was performed on Revision 1 of Jan. 2006 the HNP model in April 2001. LERF: 6.08E-7 The Revision 2 model has the ODE only findings from that Peer Review incorporated in it. This model had The most significant change that reduced a complete updated HRA, Data, CDF and contributed to LERF reduction PRA-BC-H-06-002 and Common Cause input. In was the inclusion of five hours of battery addition, the LERE model was power for ROIC operation during a station April 2006 completely redone to address all blackout. In addition, the data update LEE/EVLIIonyof the Peer Review findings provided more industry correct power regadingit.recovery factors. LERF was affected primarily by using declaration times to general emergency comparison to emergency planning evacuation data for the plant surrounding area. Rev. 3 PRA-BC-H-08-002 At-power, internal, Selected depressurization events CDF = 6.76E-6 CDF and LERF. were recalculated to a lower Jan 2009 probability of failure. Loss of LERF = 5.8E-7 ODE only battery A no longer caused a The modification to the model with turbinied tip. thes itmsowerean regards to the Loss of A station service modiiedin he mdelandbattery in conjunction with lower depress provdedthe ulkof he cang inprobabilities provided the lower overall ODE. They caused a slightvaes decrease in LERF frequency. vaus E2-14 to NL-14-0649 Description of Probabilistic Risk Analysis Table 1: History of the Malor Hatch PRA Model Updates -Model jDocument No. j Scope Updated Items CDF and LERF (lyr) Rev. 4 PRA-BC-H-1 0-008 At-power, internal, CDF and LERF. June 2010 This model has been peer reviewed to R.G. 1.200 Revision 2 ciarifications, the ASME/ANS PRA Standard and NEI 05-04. Peer review comments have been incorporated and the model meets Cat II of the ASME standard. LERF = 1.16E-6 The CDF model addressed many comments from the peer review. There were several new special initiating event trees added for electrical systems. The data and HRA was completely redone. The upgrade of the line break outside containment event values provided most of the change in core damage frequency between Revision 3 and Revision 4. The remainder of the change was distributed among the extra initiators being considered. LERF was affected most by the new values for the breaks outside containment. These were initially estimated, however, for Revision 4, line lengths were calculated and a more rigorous methodology was used. COF = 7.78 E-6 E2-15 to NL-14-0649 Description of Probabilistic Risk Analysis Consistency with Applicable ASME PRA Standard Requirements Previous Peer Review and Self Assessment for Hatch PRA Model In addition to independent internal review during each HNP PRA model development and update, the HNP PRA model has been peer reviewed twice. The first peer review was conducted by the BWR Owners Group in April 2001. The review team used Revision A-3 NEI draft "Probabilistic Risk Assessment (PRA) Peer Review Process Guidance", dated June 2, 2000 as the basis for review. This review was observed by a team from the NRC. In 2006, a gap analysis was performed against the available versions of the ASME PRA Standard and Regulatory Guide 1.200, Revision 0 (2003 trial version). RG 1.200 PRA Peer Review for Hatch PRA Model against ASME PRA Standard Requirements The decision was made to perform a complete peer review for all elements of the internal events model including Internal Flooding against R.G. 1.200 Revision 2 clarifications, the ASME/ANS PRA Standard, and NEI 05-04. This was completed in November 2009. A summary of the review is described in the following information.

1. The ASMEIANS PRA Standard contains a total of 326 numbered supporting requirements (SRs) in nine technical elements and one configuration control element. There were five not applicable requirements for the HNP review: AS-B4,

-IFEV-A8, LE-05, LE-06, and MU-01.

2.

Among 321 applicable SRs, 95% of SRs met Capability Category II or higher as follows: E2-16 to NL-14-0649 Description of Probabilistic Risk Analysis

• Capability Category (CC)

No. of SRs % of Total Applicable SRs CCO I/Il/I1l (or SR Met) 225 70% CCI 5 1% CC II 27 8% CC III ,,18 6% CC 1/11 10 3% CC IlIll1 26 8% SR Not Met 10 3% SR Not Applicable 5 1% Total 326 100%

3.

10 SRs were judged to be not met. IE-A6 was not met because the additional initiating events identified from the FME analysis were not included in the model under review. IE-B2 was not met because the IF notebook did not discuss the system for grouping initiating events. IE-B3 was not met because IE-B2 was not met. AS-B3 was not met because the Accident Sequence notebook did not provide a discussion of the phenomenological conditions for each accident sequence. SC-B5 was not met because a comparison of the thermal hydraulic calculations with those of other plants was not performed. SC-Cl was not met because, although the success criteria were very detailed, it was difficult to compare criteria to a specific initiating event. IFSN-A10 was not met because credit was not given to operator isolation of a certain flood scenario. This could cause a potential for flooding in other areas. IFQU-A5 is not met because IFSN-A1O is not met. IFQU-A6 cites an over conservatism by failing operator actions outside the main control room in flooding areas. MU-Al is not met because the SNC process used does not provide a more organized method of documentation. In addition to the not met SRs, there were five SRs that were met as Cat I. IE-A9 was met as Cat I because Plant specific experience for initiating event precursors was not provided. LE-C3 was met as Cat I only because there was no address as to the possibility of equipment repair. HNP did not credit repair during LERF conditions. LE-ClO was met as Cat I because there was no documentation regarding continued equipment operations or personnel actions in a LERF environment. HNP did not credit such actions. LE-C12 was met as Cat I because there is no documentation showing that the PRA can credit post containment failure operation of equipment or personnel actions. HNP does not credit such items: LE-C13 was met as Cat I because there was not an engineering basis for the decontamination factor used for scrubbing. E2-17 to NL-14-0649 Description of Probabilistic Risk Analysis Resolution of Findings from RG 1.200 PRA Peer Review Table 2 shows details of the 10 "SR Not Met" findings and resolutions after the peer review. In addition, the five Cat I SRs are also addressed. Table 2 Resolution of the Hatch PRA Peer Review F&Os associated 10 "SR not Met" SRs Review F&O # Element Level Resolution The Status of Resolution by the SNC IE-A6-1-2 IE-A6 Reviewed IE Notebook. Section Include the additional lEs in the The lEs identified in the notebook have been (SR not met 6, 3.16, Appendix A. The FMEA analysis. It would appear panel added to the model as well as the common CC-Il) that was performed identified failures would be very unlikely cause failure considerations. Two of the numerous IEs resulting from except for specific types of buses were not modeled as IEs because they failure of individual or multiple events, especially spatially serve only to feed two that were added as IEs. electrical panels, however, these related events. The two buses not modeled as IEs are IEs were not included in the modeled as support for systems, one of the analysis. The notebook indicates supported systems is in itself modeled as a that these new IEs would be special initiator. The special initiator modeling considered in a future revision of for the Hatch PRA not only considers what the PRA. causes a transient/scram but also what would require a shutdown per Technical Specifications. E2-18 to NL-14-0649 Description of Probabilistic Risk Analysis IE-B2-1 -7 IE-B2 (SR CC-I/Il/Ill Not met) Reviewed the IE Notebook and found that the grouping process for the IEs was not provided as required by the SR. Selection and screening, modeling and quantification process are included, however. Describe the process for systematically grouping the IEs to ensure: (a) Events can be considered similar in terms of plant response, success criteria, timing, and the effect on the operability and performance of operators and relevant mitigating systems: or (b) Events can be subsumed into a group and bounded by the worst case impacts within the new group. The IF notebook has been revised to include a full discussion of IF grouping. This comment has been addressed. IE-B3-1 -7 IE-B3 (SR Not met cc II) Reviewed the IF Notebook and found that the grouping process for the I~s was not provided as required by the SR. Selection and screening, modeling and quantification process are included, however. Describe the process for systematically grouping I~s to ensure: (a) Events can be considered similar in terms of plant response, success criteria, timing, and the effect on the operability and performance of operators and relevant mitigating systems; or (b) Events can be subsumed into a group and bounded by the worst case impacts within the new orour. This comment has been added to the IF notebook. There are no subsumed events in the Hatch PRA model. E2-19 to NL-14-0649 Description of Probabilistic Risk Analysis AS-B3-1 -9 AS-B3 (SR Not met CCi/l I/Iii) Reviewed the AS Notebook. Generally the discussion of the accident sequence modeling is adequate. However some enhancements would be beneficial:

1) Discussion of environmental conditions associated with sequences.

2)

Interface between accident sequences and plant damage states. Include additional detail for each accident sequence. Particularly, there was no mention of the generation of harsh environments affecting temperature, pressure, debris, water levels or humidity that could impact the success of the system. The detail required by this finding has been added to the accident sequence notebook. The sequence descriptions have a discussion of Environmental Conditions. The Hatch PRA does not typically rely on equipment or operator actions in an area where a severe environment is encountered. SC-B35-3-1 SC-B5 (SR No evidence could be found in Check the reasonableness and A comparison table for the Hatch PRA was Not met the PRA documentation that a acceptability of the results of the developed for Success Criteria based on input CCI/II/III) check for reasonableness, as thermal/hydraulic and any other from other BWR facilities (i.e. Pilgrim, Cooper, required by SR SC-B5, was analysis used to support the LaSalle, and Nine Mile Point). performed. Section 4.2 of the SC success criteria. Document in Notebook states that a the SC Notebook how this comparison of the success criteria reasonableness was performed. modeled for other BWRs will be performed in a future PRA update. E2-20 to NL-1 4-0649 Description of Probabilistic Risk Analysis SC-Cl1-5-4 30-03 (SR Not met The success criteria hierarchy is documented in the PRA SC NOTEBOOK and supplemented in the PRA AS NOTEBOOK and individuai system notebooks. However, it is difficult to see which systems are credited for a specific initiating event not to mention which initiators impact a specific system. The success criteria should be captured in tabular form in the 50 document. Having this information in one place will alleviate confusion when performing PRA applications and upgrades. Additionally, it will facilitate peer reviews. Provide a summary of success criteria for available mitigating systems and human actions for each initiating group. A success criteria summary table has been added to the SC notebook. This table in addition to the extreme detail already provided makes the Success Oriteria notebook extremely informative. IFSN-A10-4-5 IFSN-A10 (SR In the development process of the Operator actions should be The PRA model Used in the peer review Not met flooding scenarios there is no developed and added to the contained over 100 flood initiators. No CCI/I I/Il) credit taken for the manual scenario development and the screening was done based on operator action isolation of floods. This approach PRA model to reflect how the input. This finding was addressed by was assumed to be conservative plant would be operated in the screening the initiators to 24 and applying however, the propagation of flood event of this scenario. It may be HRA for these scenarios to mitigate the water would be expanded if no beneficial to consider use of results. operator action was taken mitigation event trees to assure therefore, affecting more areas that all mitigation issues are and SSC's than initially projected. considered. IFQU-A5-4-5 IFQU-A5 (SR In the development process of the Operator actions should be The PRA model used in the peer review Not met flooding scenarios there is no developed and added to the contained over 100 flood initiators. No CCI/I I/Ill) credit taken for the manual scenario development and the screening was done based on operator action isolation of floods. This approach PRA model to reflect how the input. This finding was addressed by was assumed to be conservative plant would be operated in the screening the initiators to 24 and applying however, the propagation of flood event of this scenario. It may be HRA for these scenarios to mitigate the water would be expanded if no beneficial to consider use of results. operator action was taken mitigation event trees to assure therefore, affecting more areas that all mitigation issues are and SSC's than initially projected. considered. E2-21 to NL-14-0649 Description of Probabilistic Risk Analysis IFQU-A6-2-7 IFQU-A6 (SR A very conservative approach Consider more realistic operator This item has been addressed for IFQU-A5 Not met was taken with respect to the actions for floods when action 5. CCI/I I/lII) impact of flooding on operator has to be taken outside the main actions. By reviewing the model it control room. was determined that all operator actions are failed (set to 1.0) if the action takes place outside the control room and the associated system is impacted by the flood. MU-Cl1-5-8 MU-Cl (SR The identified changes in PRA Recommend developing a This comment refers to the model update Not met Cat input are prioritized and then put database for use by PRA. Such process. These procedures are under 1/11/Ill) into the plant's corrective action a database should have revision. At present model change program. The current process prioritization clearly delineated, requirements tend to be governed by the use involves a handwritten entry into a This would allow a dynamic of the corrective action program. diary and a duplicate entry into assessment of the cumulative the plant's corrective action impact of pending changes. program. This process is Additionally, this will allow the cumbersome, inefficient, and more significant changes to be prone to human errors. incorporated before less __________________________significant ones E2-22 to NL-1 4-0649 Description of Probabilistic Risk Analysis Table 2 Resolution of the Hatch PRA Peer Review F&Os associated with the 5 Cat I met only SRs Review F&O # Element Level Resolution The Status of the Resolution by SNC LE-C3-7-2 LE-C3 (SR No documentation of review of Review significant progression Statements have been added to L2 NB Cat I met) significant accident progression sequences to support Section 7 of notebooks, as well as Appendix K, sequences resulting in LERF evaluations required in to note that significant accident sequences could be found. applicable SR Capability resulting in LERF were reviewed and credit for Category. continued operation or repair (beyond LOOP recovery) was not judged to be credible. Cat I/Il/Ill is considered met for this SR. LE-C1 0-7-2 LE-C1 0 No documentation of review of Review significant progression Statements have been added to L2 NB (SR Cat I significant accident progression sequences to support Section 7 of notebooks as well as Appendix K met) sequences resulting in LERF evaluations required in to note that significant accident sequences could be found. applicable SR Capability resulting in LERF were reviewed and credit for Category. continued operation or repair (beyond LOOP recovery) was not judged to be credible. Cat II is considered met for this SR. LE-C1 2-7-2 LE-C1 2 No documentation of review of Review significant progression Statements have been added to L2 NB (SR Cat I significant accident progression sequences to support Section 7 of notebooks as well as Appendix K met) sequences resulting in LERF evaluations required in to note that significant accident sequences could be found. applicable SR Capability resulting in LERF were reviewed and credit for Category. continued operation or repair (beyond LOOP recovery) was not judged to be credible. Cat II is considered met for this SR. E2-23 to NL-14-0649 Description of Probabilistic Risk Analysis LE-C13-7-4 LE-C13 Class V sequences are assumed Perform a containment bypass Text enhanced in Appendix D of notebooks (SR Cat I to lead directly to LERF without analysis as described in SR LE-(Footnote 6 added to Table HA5) and similarly met) evaluation of scrubbing of C13. in Section 7.7. The analysis regarding releases. scrubbing is approached with engineering judgment. Only scrubbing for low pressure sequences is considered and then the value is low. This basis is acceptable and the use of scrubbing is considered in the uncertainty analysis. Cat IlIll1 is considered met for this SR. IE-A9-1-4 IE-A9 (SR Reviewed IE Notebook, Section Include other sources of OE in Several sources are available to determine Cat I met) 3.1.9, and Appendix D. Although the search for IE precursors. plant specific initiating events. When interviews with plant operations preparing the IE notebook, SNC reviewed the personnel is a source of plant following sources. For each source, operating experience, the appropriate section has also been identified. approach taken (interview one person) cannot be considered a

1. Plant Specific Events: [Table 3-4; reasonably complete review of Appendix C (LERs)]

plant specific operating experience. The SR requires a

2.

Plant Systems: [Appendix B - FMEA] review of plant specific operating experience and there are a variety of OE sources that could

3.

LOCA inside Containment [3.2.3] have been considered but were not (e.g., LERs, SOERs).

4.

LOCA outside Containment [3.2.3]

5.

Multiple Failures [3.1.6]

6.

Interview [3.1.9; Appendix E] As a result of these reviews, additional special initiating events were identified and have been modeled. E2-24 to NL-14-0649 Description of Probabilistic Risk Analysis Conclusion Regarding PRA Capability The HNP PRA maintenance and update processes and technical capability evaluations described above provide a robust basis for concluding that this full scope PRA is suitabie for use in support of this risk assessment for the proposed extension of the Station Service Battery completion time. 3.2 Scope of the Probabilistic Risk Assessment or Technical Specifications Change Evaluations (covered above) E2-25 to NL-14-0649 Description of Probabilistic Risk Analysis Engineering Considerations The following section addresses the traditional engineering considerations referred to in Section 2.2 of Regulatory Guide 1.177. Increasing the completion time for the station service batteries from 2 to 12 hours will not affect the defense-in-depth capabilities of the Plant Hatch electrical power AC and DC power supply systems. Currently, the Hatch Technical Specifications does not separate having one station service battery out of service alone, with having a station service battery out of service simultaneously with a station service battery charger. In either case, the CT is currently 2 hours. Obviously, having a station service battery and battery charger out of service is a much more serious situation than having only the battery out, with the battery charger in service. We are proposing a 12 hour CT for one station service battery out of service. A 12 hour CT is still a relatively short period of time. With the station service battery out of service, but the chargers in service, the chargers are supplying the steady state loads. Should an accident occur, the charger will be able to handle many of the accident loads on that division, though not all. However, defense-in-depth is primarily provided by the fact that the other Division is Operable. At Hatch Units l and 2, one Division of DC is capable of safely shutting down the unit in an accident situation, and meeting the FSAR and TS Bases acceptance criteria. Therefore, the Operable division* provides the defense-in-depth, as well as the battery chargers in the Inoperable division. If, while in the ACTION statement for an inoperable station service battery, a component (battery or battery charger) in the other division becomes inoperable, then the Tech Specs will require immediate entry into LCO 3.0.3. The increase of the Technical Specifications CT for the station service battery does not in any way affect the design basis for the DC system or the acceptance criteria for the design basis events. The CT is being extended, nothing else is changing. Whether the CT is 2 hours or 12 hours, the design capabilities of the system are the same. The acceptability of increasing the CT from 2 to 12 hours is addressed by assessing the changes in the CDF and LERF values which, as presented in this document, fall within the RG 1.177 values. The safety margins assumed for LOCA analyses in the FSAR Chapters 14 and 15 analyses are not reduced by increasing the station service battery CT. The proposed change in CT does not involve any physical changes to the system; consequently, the independence between the two DC divisions is not compromised, and new type failures are not introduced. Furthermore, consideration of maintaining the integrity of the fission product barriers, and the mitigating accident functions such as core cooling and containment will be maintained by the scheduling and risk assessment programs at Plant Hatch. In other words, this program ensures that risk significant plant configurations do not occur during use of the 12 hour CT for the batteries; helping to maintain overall plant defense-in-depth. E2-26 to NL-14-0649 Description of Probabilistic Risk Analysis Monitoring Program The change to the Technical Specifications (TS) Completion Time for the Station Service batteries from 2 to 12 hours does not affect how those batteries will be operated. Furthermore, none of the maintenance and surveillance criteria for maintaining the battery is affected by the Probabilistic evaluation to increase the TS CT. In other words, the increase in the CT for the station service battery does not affect the criteria for maintaining cell voltage or battery terminal voltage. It does not affect temperature or level criteria, and it does not affect the return-to-service float charge criteria for determining when the battery is fully charged. In short, the probabilistic analysis only affects the Technical Specifications Completion Time, consequently, it does not change the Licensing Basis with respect to how the battery is maintained and surveilled. Consequently, no adverse safety degradation is expected to occur as a result of the increase in the Completion Time. Accordingly, the performance monitoring on the station service DC system as discussed in Reg Guide 1.174, Element 3, will be done by the routine 10 CFR 50.65 Maintenance Rule Monitoring of which the Station Service and Diesel Generator DC systems are already a part. E2-27}}