NL-24-0335, License Amendment Request to Revise Technical Specification Surveillance Requirements for Diesel General Loading

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License Amendment Request to Revise Technical Specification Surveillance Requirements for Diesel General Loading
ML25037A316
Person / Time
Site: Hatch  
Issue date: 02/06/2025
From: Coleman J
Southern Nuclear Operating Co
To:
Office of Nuclear Reactor Regulation, Document Control Desk
References
NL-24-0335
Download: ML25037A316 (1)
v • d • e


Text

J!. Southern Nuclear February 6, 2025 Docket Nos.: 50-321 50-366 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D. C. 20555-0001 Regulatory Affairs Edwin I. Hatch Nuclear Plant - Units 1 & 2 3535 Colonnade Parkway Birmingham, AL 35243 205 992 5000 NL-24-0335 10 CFR 50.90 License Amendment Request to Revise Technical Specification Surveillance Requirements for Diesel Generator Loading Ladies and Gentlemen:

Pursuant to 10 CFR 50.90, Southern Nuclear Operating Company (SNC) requests a license amendment to the Edwin I. Hatch Nuclear Plant (HNP) Units 1 and 2 Renewed Facility Operating Licenses DPR-57 and NPF-5 respectively. The proposed amendment revises the diesel generator (DG) loading required by Surveillance Requirement (SR) 3.8.1.2 and SR 3.8.1.5. Specifically, the proposed change would replace the current DG loading requirements with a loading requirement of 90 to 100% of the continuous rating for the DG.

The enclosure provides a basis for the proposed change. Attachment 1 contains marked-up Technical Specification (TS) pages. Attachment 2 contains revised (clean) TS pages. provides the marked-up TS Bases pages for information only.

SNC requests approval of the proposed amendment within 12 months of completion of the NRC's acceptance review. Once approved, the amendment shall be implemented within 60 days.

In accordance with 10 CFR 50.91, a copy of this application, with attachments, is being provided to the designated Georgia State Official.

This letter contains no NRC commitments. If you have any questions, please contact Ryan Joyce at 205.992.6468.

U. S. Nuclear Regulatory Commission NL-24-0335 Page 2 I declare under penalty of perjury that the foregoing is true and correct. Executed on the 6th day of February 2025.

Respectfully submitted,

~~

Jamie M. Coleman Director, Regulatory Affairs Southern Nuclear Operating Company JMC/jdj/cbg

Enclosure:

Basis for Proposed Changes Attachments: 1. Proposed Technical Specification Changes (Marked-up Pages)

2. Revised Technical Specification Pages
3. Proposed Technical Specification Bases Pages (Marked-up) - For Information Only cc:

Regional Administrator, Region II NRR Project Manager-Hatch 1 & 2 Senior Resident Inspector - Hatch 1 & 2 Director, Environmental Protection Division, State of Georgia RType: CHA02.004

Edwin I. Hatch Nuclear Plant-Units 1 & 2 Application to Revise Technical Specification Surveillance Requirements for Diesel Generator Loading Enclosure Basis for Proposed Changes

Enclosure to NL-24-0335 Basis for Proposed Changes 1.0

SUMMARY

DESCRIPTION Pursuant to 10 CFR 50.90, Southern Nuclear Operating Company (SNC) requests a license amendment to the Edwin I. Hatch Nuclear Plant (HNP) Units 1 and 2 Renewed Facility Operating Licenses DPR-57 and NPF-5 respectively. The proposed amendment revises the Surveillance Requirement (SR) diesel generator (DG) loading required by SR 3.8.1.2 and SR 3.8.1.5. Specifically, the proposed change would replace the current DG loading requirements with a loading requirement of 90 to 100% of the continuous rating for the DGs.

2.0 DETAILED DESCRIPTION 2.1 System Design and Operation The standby ac power supply consists of five DGs for both HNP 1 and 2 and supplies standby power for 4160-V emergency service buses 1 E, 1 F, 1 G, 2E, 2F, and 2G. Diesel generators 1A, 1 C, 2A, and 2C each supply an emergency bus. Diesel generator 1 B can supply either 4160-V emergency bus 1 For 2F.

The HNP Unit 1 onsite standby power source for 4.16 kV ESF buses 1 E and 1 G consists of two DGs. DGs 1A and 1 Care dedicated to ESF buses 1 E and 1 G, respectively. The HNP Unit 2 onsite standby power source for 4.16 kV ESF buses 2E and 2G consists of two DGs. DGs 2A and 2C are dedicated to ESF buses 2E and 2G, respectively. DG 1 B (the swing DG) is a shared power source and can supply either Unit 1 ESF bus 1 For Unit 2 ESF bus 2F.

A DG starts automatically on a loss of coolant accident (LOCA) signal (i.e., low reactor water level signal or high drywell pressure signal) or on an ESF bus degraded voltage or undervoltage signal. After the DG has started, it automatically ties to its respective bus after offsite power is tripped as a consequence of ESF bus undervoltage or degraded voltage, independent of or coincident with a LOCA signal. The DGs also start and operate in the standby mode without tying to the ESF bus on a LOCA signal alone. Following the trip of offsite power, load shed relays strip nonpermanent loads from the ESF bus. When the DG is tied to the ESF bus, loads are then sequentially connected to its respective ESF bus by the automatic load sequence timing devices. The sequencing logic controls the permissive and starting signals to motor breakers to prevent overloading the DG.

All DGs have the following ratings:

a. 2850 kW - continuous
b. 3100 kW - 2000 hours0.0231 days <br />0.556 hours <br />0.00331 weeks <br />7.61e-4 months <br />,
c. 3250 kW - 300 hours0.00347 days <br />0.0833 hours <br />4.960317e-4 weeks <br />1.1415e-4 months <br />, and
d. 3500 kW - 30 minutes 2.2 Current Technical Specification Requirements Emphasis added to the affected sections. Notes are not included in the selections below because they are not affected by the proposed change.

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Enclosure to NL-24-0335 Basis for Proposed Changes Unit 1 SR 3.8.1.2 states:

Verify each DG:

a.

Starts from standby conditions and achieves steady state voltage~ 3740 V and::; 4243 V and frequency~ 58.8 Hz and::; 61.2 Hz; and

b.

Operates for ~ 60 minutes at a load ~ 1710 kW and :S 2000 kW.

SR 3.8.1.5 states:

Verify each DG:

a.

Starts from standby conditions and achieves, in ::; 12 seconds, voltage ~ 37 40 V and frequency~ 58.8 Hz and after steady state conditions are reached, maintains voltage ~

3740 V and::; 4243 V and frequency~ 58.8 Hz and::; 61.2 Hz; and

b.

Operates for~ 60 minutes at a load~ 2250 kW and :S 2400 kW for DGs 1A and 1C, and ~ 2360 kW and :S 2425 kW for DG 1 B.

Unit 2 SR 3.8.1.2 states:

Verify each DG:

a.

Starts from standby conditions and achieves steady state voltage~ 3740 V and::; 4243 V and frequency~ 58.8 Hz and::; 61.2 Hz; and

b.

Operates for ~ 60 minutes at a load ~ 1710 kW and :S 2000 kW.

SR 3.8.1.5 states:

Verify each DG:

a.

Starts from standby conditions and achieves, in ::; 12 seconds, voltage ~ 37 40 V and frequency~ 58.8 Hz and after steady state conditions are reached, maintains voltage ~

3740 V and::; 4243 V and frequency~ 58.8 Hz and::; 61.2 Hz; and

b.

Operates for ~ 60 minutes at a load ~ 2764 kW and :S 2825 kW for DG 2A, and ~ 2360 kW and :S 2425 kW for DG 1 B, and~ 2742 kW and :S 2825 kW for DG 2C.

2.3 Reason for Proposed Change The proposed change will improve DG testing by demonstrating the ability of the DGs to run loaded to between 90 and 100% of their continuous rating during performance of SR 3.8.1.2 (monthly test) and SR 3.8.1.5 (semi-annual test). This is consistent with Regulatory Guide (RG) 1.108, Revision 1 (Reference 1) for periodic slow start and fast start DG testing. Neither HNP Unit 1 nor Unit 2 are committed to RG 1.108 as described in the Surveillance Requirements section of the TS Bases for each Unit. These changes will make the DG testing consistent for all DGs.

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Enclosure to NL-24-0335 Basis for Proposed Changes 2.4 Description of the Proposed Change Proposed TS SR 3.8.1.2 Verify each DG:

a.

Starts from standby conditions and achieves steady state voltage~ 3740 V and::; 4243 V and frequency~ 58.8 Hz and::; 61.2 Hz; and

b.

Operates for ~ 60 minutes at a load ~ 74-0 2565 kW and ::; 2000 2850 kW.

SR 3.8.1.5 Verify each DG:

a.

Starts from standby conditions and achieves, in ::; 12 seconds, voltage ~ 37 40 V and frequency~ 58.8 Hz and after steady state conditions are reached, maintains voltage ~

3740 V and::; 4243 V and frequency~ 58.8 Hz and::; 61.2 Hz; and

b.

Operates for~ 60 minutes at a load~ 22W 2565 kW and::; 2400 2850 kW. for DGs 1A and 1 C, and > 236Q k'A' and < 2425 k'A' for DG 18.

Unit 2 SR 3.8.1.2 Verify each DG:

a.

Starts from standby conditions and achieves steady state voltage~ 3740 V and::; 4243 V and frequency~ 58.8 Hz and::; 61.2 Hz; and

b.

Operates for ~ 60 minutes at a load ~ 74-0 2565 kW and ::; 2000 2850 kW.

SR 3.8.1.5 Verify each DG:

a.

Starts from standby conditions and achieves, in ::; 12 seconds, voltage ~ 37 40 V and frequency~ 58.8 Hz and after steady state conditions are reached, maintains voltage ~

3740 V and::; 4243 V and frequency~ 58.8 Hz and::; 61.2 Hz; and

b.

Operates for ~ 60 minutes at a load ~ 2-7i4 2565 kW and ::; ~

2850 kW. for DG 2A, and > 236Q k'A' and < 2425 k'A' for DG 1 B, and > 2742 k'A' and < 2825 k'A' for DG 2G-c A mark-up of the proposed change to SR 3.8.1.2 and SR 3.8.1.5 is provided in Attachment 1. provides the "clean" retyped SR 3.8.1.2 and SR 3.8.1.5. Attachment 3 provides a mark-up of the TS Bases for information only. An additional markup is included in the HNP Unit 1 TS Bases to correct the DG ratings. All DGs at HNP have the same ratings.

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Enclosure to NL-24-0335 Basis for Proposed Changes

3.0 TECHNICAL EVALUATION

3.1 Technical Analysis As stated by RG 1.108. Revision 1, the purpose of routine DG testing is to ensure that the DG power systems will meet their availability requirements. Periodic testing of DGs during normal plant operation should:

(1) Demonstrate proper startup and verify that the required voltage and frequency are automatically attained within acceptable limits and time. This test should also verify that the components of the DG required for automatic startup are operable.

(2) Demonstrate full-load-carrying capability (continuous rating) for an interval of not less than one hour. The test should also verify that the cooling system functions within design limits. This test could be accomplished by synchronizing the generator with the offsite power and assuming a load at the maximum practical rate.

SR 3.8.1.2 and SR 3.8.1.5 accomplish this testing guidance.

3.1.1 Surveillance Requirement 3.8.1.2 This SR helps to ensure the availability of the standby electrical power supply to mitigate DBAs and transients and maintain the unit in a safe shutdown condition and verifies that the DGs are capable of proper startup, synchronizing, and accepting a load approximately 60% (currently) of the continuous load rating. This demonstrates DG capability while minimizing the mechanical stress and wear on the engine. A minimum run time of 60 minutes is required to stabilize engine temperatures, while minimizing the time that the DG is connected to the offsite source.

In 1987, the current DG loading for SR 3.8.1.2 was established (Reference 2). The basis for the loading was to implement the manufacturer's recommended testing and to verify starting and load handling capability. The diesel manufacturer recommended that the DGs always be loaded to a minimum of 60% of rated load (1710 kW) when started during routine testing. A load range was established (1710 kW - 2000 kW) to make it simpler to load the DGs for testing.

The industry now recommends operating the DG at 90-100% of the continuous rating when operated for routine testing. Therefore, this LAR requests that the loading range for SR 3.8.1.2 be changed to reflect 90-100% of the continuous rating of each DG. The lower limit of the load band ensures the DG is sufficiently loaded during the test and the upper limit of the load band is to avoid an overload condition during routine testing. The upper and lower limits provide a reasonable band to operate the DG in for the specified run time while achieving the intent of a full load.

The current and proposed load range for SR 3.8.1.2 is given below.

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Enclosure to NL-24-0335 Basis for Proposed Changes DG SR 3.8.1.2 Current Load Range 1A

~ 1710 kW and

5 2000 kW 1B

~ 1710 kW and

5 2000 kW 1C

~ 1710 kW and

5 2000 kW 2A

~ 1710 kW and

5 2000 kW 2C

~ 1710 kW and

5 2000 kW Percent SR 3.8.1.2 Percent Continuous Proposed Load Continuous Rating Range Rating 60% to 70%

~ 2565 kW and 90% to 100%

5 2850 kW 60% to 70%

~ 2565 kW and 90% to 100%

5 2850 kW 60% to 70%

~ 2565 kW and 90% to 100%

5 2850 kW 60% to 70%

~ 2565 kW and 90% to 100%

5 2850 kW 60% to 70%

~ 2565 kW and 90% to 100%

5 2850 kW This is acceptable because the purpose of the one hour loaded run is to demonstrate full-load-carrying capability (continuous rating) for an interval of not less than one hour. This test is accomplished by synchronizing the generator with the offsite power and assuming a load at the maximum practical rate. This test does not verify the endurance limits of the DGs. DG loading levels are verified during the performance of the 24-hour endurance run described in SR 3.8.1.12. The loading criteria for the 24-hour endurance test is unchanged and changing DG loading for the 1-hour loaded run will not affect the current verification of the DG's ability to sustain the loading for a continued period of time.

Additionally, RG 1.108, revision 1, Section 2.c(2) addresses the loading of a DG to the continuous rating of the DG. A range is provided in the SR to prevent overloading the DG while ensuring that the intent of the guidance in RG 1.108 is met.

The acceptance criterion for the test remains the stabilization of the voltage and frequency within the prescribed acceptable limits for SR 3.8.1.2.a. The acceptance criteria for SR 3.8.1.2.b is the successful running of the DG while loaded in accordance with the kW limits in the SR. All parameters monitoring the condition of the running engine are expected to stabilize within the 1-hour test duration. When the DG starts, any malfunction of the engine or its supporting systems will be indicated by abnormal display of parameters such as rapid rising lube oil/jacket water temperature, fluid leakage, vibration, governor malfunction, and fuel delivery.

Therefore, loading the DG at a minimum of 90% is acceptable for SR 3.8.1.2.b (the 1-hour portion of the surveillance test).

Since the revised loading limit for the monthly surveillance test remains at or below the continuous rating of the DG, the change will not affect the current maintenance interval for the engines.

3.1.2 Surveillance Requirement 3.8.1.5 This Surveillance verifies that the DGs are capable of a "fast cold" start, synchronizing, and accepting a load more closely simulating accident loads. A minimum run time of 60 minutes is required to stabilize engine temperatures, while minimizing the time that the DG is connected to the offsite source.

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Enclosure to NL-24-0335 Basis for Proposed Changes In 1987, the current DG loading for SR 3.8.1.5 was established (Reference 2) based on the load distribution on emergency buses for HNP Unit 2 and a higher rating than the 60% minimum for the monthly test for HNP Unit 1.

For HNP Unit 1, the proposed change will improve DG testing by demonstrating the ability of the DGs to run loaded to between 90 and 100% of their continuous rating. This is an increase in the load requirements for DGs 1A, 1B and 1C, as shown in the table below.

For HNP Unit 2, the proposed change will create consistent testing conditions for all the DGs between Unit 1 and Unit 2 by enlarging the load window for DG testing and increase the upper limit to 100% of the continuous rating.

DG SR 3.8.1.5 Percent SR 3.8.1.5 Percent Current Load Continuous Proposed Load Continuous Range Rating Range Rating 1A

~ 2250 kW and 79% to 84%

~ 2565 kW and 90% to 100%

5 2400 kW
5 2850 kW 1B

~ 2360 kW and 83% to 85%

~ 2565 kW and 90% to 100%

5 2425 kW
5 2850 kW 1C

~ 2250 kW and 79% to 84%

~ 2565 kW and 90% to 100%

5 2400 kW
5 2850 kW 2A

~ 2764 kW and 97% to 99%

~ 2565 kW and 90% to 100%

5 2825 kW
5 2850 kW 2C

~ 2742 kW and 96% to 99%

~ 2565 kW and 90% to 100%

5 2825 kW
5 2850 kW This is acceptable because the purpose of the one hour loaded run is to demonstrate full-load-carrying capability (continuous rating) for an interval of not less than one hour. This test is accomplished by synchronizing the generator with the offsite power and assuming a load at the maximum practical rate. This test does not verify the endurance limits of the DGs. DG loading levels are verified during the performance of the 24-hour endurance run described in SR 3.8.1.12. The loading criteria for the 24-hour endurance test is unchanged and changing DG loading for the 1-hour loaded run will not affect the current verification of the DG's ability to sustain the loading for a continued period of time.

Additionally, RG 1.108, revision 1, Section 2.c(2) addresses the loading of a DG to the continuous rating of the DG. A range is provided in the SR to prevent overloading the DG while ensuring that the intent of the guidance in RG 1.108 is met.

The acceptance criterion for the test remains the stabilization of the voltage and frequency within the prescribed acceptable limits for SR 3.8.1.5.a. The acceptance criteria for SR 3.8.1.5.b is the successful running of the DG while loaded in accordance with the kW limits in the SR. All parameters monitoring the condition of the running engine are expected to stabilize within the 1-hour test duration. When the DG starts, any malfunction of the engine or its supporting systems will be indicated by abnormal display of parameters such as rapid rising lube oil/jacket water temperature, fluid leakage, vibration, governor malfunction, and fuel delivery.

Therefore, loading the DG at a minimum of 90% is acceptable for SR 3.8.1.5.b (the 1-hour portion of the surveillance test).

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Enclosure to NL-24-0335 Basis for Proposed Changes Since the revised loading limit for the semi-annual surveillance test remains at or below the continuous rating of the DG, the change will not affect the current maintenance interval for the engines.

3.1.3 Design Basis The AC sources are designed to permit inspection and testing of all important areas and features, especially those that have a standby function, in accordance with 10 CFR 50, General Design Criterion 18. Periodic component tests are supplemented by extensive functional tests during refueling outages under simulated accident conditions. The SRs for demonstrating the Operability of the DGs are generally consistent with the recommendations of RG 1.9, Revision 0, and RG 1.108, Revision 1, although HPN Unit 1 is not committed to either of these RGs and HPN Unit 2 is not committed to RG 1.108. The requested change in the DG test loading remains generally consistent with the recommendations of RG 1.9, Revision O and RG 1.108, Revision 1. Therefore, no change to the committed regulatory guidance is proposed or needed to support this proposed TS change.

As noted in Sections 3.1.1 and 3.1.2, the purpose of operating the DG for one hour is to verify that the DGs are capable of synchronizing and accepting a load close to their continuous load rating. These SRs do not address the accident response of the DGs which are addressed by other SRs generally performed during refueling outages. The proposed TS changes affect frequent (monthly, semi-annual) tests that ensure the DGs remain Operable by starting, achieving the necessary voltage and frequency, and carrying a load approximating their continuous rating for a short time. Therefore, since the SRs affected by this proposed change do not address accident response, the maximum loading of a DG during an accident is not affected by this request.

3.1.4 Conclusion The SRs for demonstrating the Operability of the DGs are generally consistent with the recommendations of RG 1.108 (Reference 1) although HNP Units 1 and 2 are not committed to this RG.

4.0 REGULATORY EVALUATION

4.1 Applicable Regulatory Requirements/Criteria The proposed change has been evaluated to determine whether applicable regulations and requirements continue to be met.

10 CFR 50 Appendix A, GDCs 17 and 18 Criterion 17, "Electric Power Systems," requires that onsite electric power systems have sufficient independence, capacity, redundancy, and testability to perform their safety functions, assuming a single failure.

Criterion 18, "Inspection and Testing of Electric Power Systems," requires that electric power systems important to safety be designed to permit appropriate periodic inspection and testing to assess the continuity of the systems and the condition of their components.

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Enclosure to NL-24-0335 Basis for Proposed Changes The proposed change continues to assure the Operability of the DGs and maintains the plant design and licensing basis.

10 CFR 50.36 The NRC's regulatory requirements related to the content of the TS are set forth in 10 CFR 50.36, "Technical specifications." Per 10 CFR 50.36(c)(3), surveillance requirements are requirements relating to test, calibration, or inspection to assure that the necessary quality of systems and components is maintained, that facility operation will be within safety limits, and that the limiting conditions for operation will be met.

The regulatory requirements in 10 CFR 50.36 are not specific regarding surveillance requirements other than to assure that the necessary quality of systems and components is maintained, that facility operation will be within safety limits, and that the limiting conditions for operation will be met. The proposed change is consistent with the requirements of 10 CFR 50.36(c)(3).

Regulatory Guide 1.108, Revision 1 This RG provides design and operational provisions for the performance of periodic testing of DG units used for onsite electric power for nuclear power plants. This change is consistent with the testing requirements of RG 1.108.

4.2 Precedent Salem Generating Station requested a change to the DG loading for the monthly testing (Reference 3). The NRC approved the request (Reference 4).

4.3 No Significant Hazards Consideration Analysis Southern Nuclear Operating Company (SNC) requests a license amendment to the Edwin I.

Hatch Nuclear Plant (HNP) Units 1 and 2 Renewed Facility Operating Licenses DPR-57 and NPF-5 respectively. The proposed amendment revises the Technical Specification (TS)

Surveillance Requirement (SR) diesel generator (DG) loading required by SR 3.8.1.2 and SR 3.8.1.5. Specifically, the proposed change would replace the current DG loading requirements with a loading requirement of 90 to 100% of the continuous rating for the DGs.

SNC has evaluated if a significant hazards consideration is involved with the proposed amendment(s) by focusing on the three standards set forth in 10 CFR 50.92, "Issuance of amendment," as discussed below:

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

Response: No The DGs are required to be Operable in the event of a design basis accident coincident with a loss of offsite power to mitigate the consequences of the accident.

The DGs are not accident initiators and therefore these changes do not involve a significant increase in the probability of an accident previously evaluated. The E-8

Enclosure to NL-24-0335 Basis for Proposed Changes accident analyses assume that at least one engineered safety feature bus is provided with power either from the offsite circuits or the DGs. The TS change proposed in this license amendment request does not impact the DGs capacity and capability to assume their maximum design basis accident loads. The proposed change does not change how the plant would mitigate an accident previously evaluated.

The proposed change does not adversely affect accident initiators or precursors nor alter the design assumptions, conditions, and configuration of the facility or the manner in which the plant is operated and maintained. The proposed change does not adversely affect the ability of structures, systems, and components (SSC) to perform their intended safety function to mitigate the consequences of an initiating event within the assumed acceptance limits. The proposed change does not affect the source term, containment isolation, or radiological release assumptions used in evaluating the radiological consequences of any accident previously evaluated.

Further, the proposed change does not increase the types and amounts of radioactive effluent that may be released offsite, nor significantly increase individual or cumulative occupational/public radiation exposure.

Therefore, the proposed change does not involve a significant increase in the probability or consequences of an accident previously evaluated.

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

Response: No The proposed TS change does not involve a change in the plant design, system operation, or the use of the DGs. The proposed change requires the DGs to be tested at increased loads which continue to demonstrate the capability and capacity of the DGs to perform their required functions. There are no new failure modes or mechanisms created due to testing the DGs at the proposed test loading. Testing of the emergency DGs at the proposed test loadings does not involve any modification in the operational limits or physical design of plant systems. There are no new accident precursors generated due to the proposed test loadings.

Therefore, the proposed change does not create the possibility of a new or different kind of accident from any accident previously evaluated.

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

Response: No The proposed TS change will continue to demonstrate that the DGs meet the TS definition of Operability, that is, the proposed tests will demonstrate that the DGs will perform their safety function and the necessary DG attendant instrumentation, controls, cooling, lubrication and other auxiliary equipment required for the emergency DGs to perform their safety function are also tested at these proposed loadings. The proposed testing will also continue to demonstrate the capability and E-9

Enclosure to NL-24-0335 Basis for Proposed Changes capacity of the DGs to support loads near their continuous ratings. The proposed change does not alter the manner in which safety limits, limiting safety system settings or limiting conditions for operation are determined. The safety analysis acceptance criteria are not impacted by this change. The proposed change will not result in plant operation in a configuration outside the design basis.

Therefore, the proposed change does not involve a significant reduction in a margin of safety.

Based on the above, SNC concludes that the proposed change presents no significant hazards consideration under the standards set forth in 10 CFR 50.92(c), and, accordingly, a finding of "no significant hazards consideration" is justified.

4.4 Conclusion In conclusion, based on the considerations discussed above, (1) there is reasonable assurance that the health and safety of the public will not be endangered by operation in the proposed manner, (2) such activities will be conducted in compliance with the Commission's regulations, and (3) the issuance of the amendment will not be inimical to the common defense and security or to the health and safety of the public.

5.0 ENVIRONMENTAL CONSIDERATION

A review has determined that the proposed amendment would change a requirement with respect to installation or use of a facility component located within the restricted area, as defined in 10 CFR 20, or would change an inspection or surveillance requirement. However, the proposed amendment does not involve (i) a significant hazards consideration, (ii) a significant change in the types or a significant increase in the amounts of any effluents that may be released offsite, or (iii) a significant increase in individual or cumulative occupational radiation exposure.

Accordingly, the proposed amendment 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 amendment.

6.0 REFERENCES

1. Regulatory Guide 1.108, Revision 1, "Periodic Testing of Diesel Generator Units Used as Onsite Electric Power Systems at Nuclear Power Plants," dated August 1977 (ADAMS Accession No. ML12216A011)
2. Letter from NRC to SNC, "Issuance of Amendment Nos.147 and 83 to Facility Operating Licenses DPR-57 and NPF-5," dated August 25, 1987 (ADAMS Accession No. ML012970477)
3. Letter from PSE&G (Salem Generating Station) to the Nuclear Regulatory Commission, "Request for Change to Technical Specifications - 3/4.8.1 AC Sources," dated May 15, 2000 (ADAMS Accession No. ML003717684)

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Enclosure to NL-24-0335 Basis for Proposed Changes

4. Letter from NRC to PSE&G, "Issuance of Amendment re: Technical Specifications Section 3/4.8.1 AC Sources," dated April 2, 2001 (ADAMS Accession No. ML010580304)

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Edwin I. Hatch Nuclear Plant-Units 1 & 2 Application to Revise Technical Specification Surveillance Requirements for Diesel Generator Loading Proposed Technical Specification Changes (Marked-Up Pages)

AC Sources - Operating 3.8.1 SURVEILLANCE REQUIREMENTS SR 3.8.1.2 (continued)

SR 3.8.1.3 SR 3.8.1.4 HATCH UNIT 1 SURVEILLANCE

NOTES-----------------------------

6.

Starting transients above the upper voltage limit do not invalidate this test.

7.

Momentary transients outside the load range do not invalidate this test.

8.

This Surveillance shall be conducted on only one DG at a time.

Verify each DG:

a.

Starts from standby conditions and achieves steady state voltage ~ 37 40 V and ::; 4243 V and frequency ~ 58.8 Hz and

61.2 Hz; and
b.

Operates for ~ 60 minutes at a load

~ 25654-740 kW and::; 2850~ kW.

Verify each day tank contains ~ 500 gallons of fuel oil.

Check for and remove accumulated water from each day tank.

3.8-8 FREQUENCY In accordance with the Surveillance Frequency Control Program In accordance with the Surveillance Frequency Control Program In accordance with the Surveillance Frequency Control Program (continued)

Amendment No. ~

AC Sources - Operating 3.8.1 SURVEILLANCE REQUIREMENTS continued SR 3.8.1.5 HATCH UNIT 1 SURVEILLANCE

NOTES-----------------------------

1.

All DG starts may be preceded by an engine prelube period.

2.

DG loadings may include gradual loading as recommended by the manufacturer.

3.

Momentary load transients outside the load range do not invalidate this test.

4.

This Surveillance shall be conducted on only one DG at a time.

5.

For the swing DG, a single test will satisfy this Surveillance for both units, using the starting circuitry of Unit 1 and synchronized to 4160 V bus 1 F for one periodic test and the starting circuitry of Unit 2 and synchronized to 4160 V bus 2F during the next periodic test.

Verify each DG:

a.

Starts from standby conditions and achieves, in ::; 12 seconds, voltage

~ 3740 V and frequency~ 58.8 Hz and after steady state conditions are reached, maintains voltage ~ 37 40 V and ::; 4243 V and frequency~ 58.8 Hz and ::; 61.2 Hz; and

b.

Operates for ~ 60 minutes at a load

~ 2565~ kW and::; 2850~ kW.-fGf DGs 1A and 1C, and> 2360 kVV and

< 2425 kVV for DG 1 B.

3.8-9 FREQUENCY In accordance with the Surveillance Frequency Control Program (continued)

Amendment No.~

AC Sources - Operating 3.8.1 SURVEILLANCE REQUIREMENTS SR 3.8.1.2 (continued)

SR 3.8.1.3 SR 3.8.1.4 HATCH UNIT 2 SURVEILLANCE

NOTES---------------------------

6.

Starting transients above the upper voltage limit do not invalidate this test.

7.

Momentary transients outside the load range do not invalidate this test.

8.

This Surveillance shall be conducted on only one DG at a time.

Verify each DG:

a.

Starts from standby conditions and achieves steady state voltage ~ 37 40 V and ::; 4243 V and frequency ~ 58.8 Hz and

61.2 Hz; and
b.

Operates for ~ 60 minutes at a load

~ 2565474-G kW and ::; 2850~ kW.

Verify each day tank contains ~ 500 gallons of fuel oil.

Check for and remove accumulated water from each day tank.

3.8-8 FREQUENCY In accordance with the Surveillance Frequency Control Program In accordance with the Surveillance Frequency Control Program In accordance with the Surveillance Frequency Control Program (continued)

Amendment No. ~

AC Sources - Operating 3.8.1 SURVEILLANCE REQUIREMENTS (continued)

SR 3.8.1.5 HATCH UNIT 2 SURVEILLANCE

NOTES-----------------------------

1.

All DG starts may be preceded by an engine prelube period.

2.

DG loadings may include gradual loading as recommended by the manufacturer.

3.

Momentary load transients outside the load range do not invalidate this test.

4.

This Surveillance shall be conducted on only one DG at a time.

5.

For the swing DG, a single test will satisfy this Surveillance for both units, using the starting circuitry of Unit 2 and synchronized to 4160 V bus 2F for one periodic test and the starting circuitry of Unit 1 and synchronized to 4160 V bus 1 F during the next periodic test.

Verify each DG:

a.

Starts from standby conditions and achieves, in ::; 12 seconds, voltage

~ 3740 V and frequency~ 58.8 Hz and after steady state conditions are reached, maintains voltage ~ 37 40 V and ::; 4243 V and frequency~ 58.8 Hz and ::; 61.2 Hz; and

b.

Operates for ~ 60 minutes at a load

~ 2565~ kW and ::; 2850~ kW.:.-fGf DG 2/\., > 2360 kVV and< 2425 kVV for DG 1 B, and> 2742 kVV and< 2825 kVV for DG 3.8-9 FREQUENCY In accordance with the Surveillance Frequency Control Program (continued)

Amendment No. ~

Edwin I. Hatch Nuclear Plant-Units 1 & 2 Application to Revise Technical Specification Surveillance Requirements for Diesel Generator Loading Revised Technical Specification Pages

AC Sources - Operating 3.8.1 SURVEILLANCE REQUIREMENTS SR 3.8.1.2 (continued)

SR 3.8.1.3 SR 3.8.1.4 HATCH UNIT 1 SURVEILLANCE

NOTES-----------------------------

6.

Starting transients above the upper voltage limit do not invalidate this test.

7.

Momentary transients outside the load range do not invalidate this test.

8.

This Surveillance shall be conducted on only one DG at a time.

Verify each DG:

a.

Starts from standby conditions and achieves steady state voltage ~ 37 40 V and ::; 4243 V and frequency ~ 58.8 Hz and

61.2 Hz; and
b.

Operates for ~ 60 minutes at a load

~ 2565 kW and::; 2850 kW.

Verify each day tank contains ~ 500 gallons of fuel oil.

Check for and remove accumulated water from each day tank.

3.8-8 FREQUENCY In accordance with the Surveillance Frequency Control Program In accordance with the Surveillance Frequency Control Program In accordance with the Surveillance Frequency Control Program (continued)

Amendment No.

AC Sources - Operating 3.8.1 SURVEILLANCE REQUIREMENTS (continued)

SR 3.8.1.5 HATCH UNIT 1 SURVEILLANCE

NOTES-----------------------------

1.

All DG starts may be preceded by an engine prelube period.

2.

DG loadings may include gradual loading as recommended by the manufacturer.

3.

Momentary load transients outside the load range do not invalidate this test.

4.

This Surveillance shall be conducted on only one DG at a time.

5.

For the swing DG, a single test will satisfy this Surveillance for both units, using the starting circuitry of Unit 1 and synchronized to 4160 V bus 1 F for one periodic test and the starting circuitry of Unit 2 and synchronized to 4160 V bus 2F during the next periodic test.

Verify each DG:

a.

Starts from standby conditions and achieves, in ::; 12 seconds, voltage

~ 3740 V and frequency~ 58.8 Hz and after steady state conditions are reached, maintains voltage ~ 37 40 V and ::; 4243 V and frequency~ 58.8 Hz and ::; 61.2 Hz; and

b.

Operates for ~ 60 minutes at a load

~ 2565 kW and::; 2850 kW.

3.8-9 FREQUENCY In accordance with the Surveillance Frequency Control Program (continued)

Amendment No.

AC Sources - Operating 3.8.1 SURVEILLANCE REQUIREMENTS SR 3.8.1.2 (continued)

SR 3.8.1.3 SR 3.8.1.4 HATCH UNIT 2 SURVEILLANCE

NOTES---------------------------

6.

Starting transients above the upper voltage limit do not invalidate this test.

7.

Momentary transients outside the load range do not invalidate this test.

8.

This Surveillance shall be conducted on only one DG at a time.

Verify each DG:

a.

Starts from standby conditions and achieves steady state voltage ~ 37 40 V and ::; 4243 V and frequency ~ 58.8 Hz and

61.2 Hz; and
b.

Operates for ~ 60 minutes at a load

~ 2565 kW and::; 2850 kW.

Verify each day tank contains ~ 500 gallons of fuel oil.

Check for and remove accumulated water from each day tank.

3.8-8 FREQUENCY In accordance with the Surveillance Frequency Control Program In accordance with the Surveillance Frequency Control Program In accordance with the Surveillance Frequency Control Program (continued)

Amendment No.

AC Sources - Operating 3.8.1 SURVEILLANCE REQUIREMENTS (continued)

SR 3.8.1.5 HATCH UNIT 2 SURVEILLANCE

NOTES-----------------------------

1.

All DG starts may be preceded by an engine prelube period.

2.

DG loadings may include gradual loading as recommended by the manufacturer.

3.

Momentary load transients outside the load range do not invalidate this test.

4.

This Surveillance shall be conducted on only one DG at a time.

5.

For the swing DG, a single test will satisfy this Surveillance for both units, using the starting circuitry of Unit 2 and synchronized to 4160 V bus 2F for one periodic test and the starting circuitry of Unit 1 and synchronized to 4160 V bus 1 F during the next periodic test.

Verify each DG:

a.

Starts from standby conditions and achieves, in ::; 12 seconds, voltage

~ 3740 V and frequency~ 58.8 Hz and after steady state conditions are reached, maintains voltage ~ 37 40 V and ::; 4243 V and frequency~ 58.8 Hz and ::; 61.2 Hz; and

b.

Operates for ~ 60 minutes at a load

~ 2565 kW and::; 2850 kW.

3.8-9 FREQUENCY In accordance with the Surveillance Frequency Control Program (continued)

Amendment No.

Edwin I. Hatch Nuclear Plant-Units 1 & 2 Application to Revise Technical Specification Surveillance Requirements for Diesel Generator Loading Proposed Technical Specification Bases Pages (Marked-up) - For Information Only

BASES BACKGROUND (continued)

a. 2850 kW - continuous,
b. 3100 kW - 2000 hours0.0231 days <br />0.556 hours <br />0.00331 weeks <br />7.61e-4 months <br />,
c. 3250 kW - 300 hours0.00347 days <br />0.0833 hours <br />4.960317e-4 weeks <br />1.1415e-4 months <br />, and
d. 3500 kW - 30 minutes.

HATCH UNIT 1 AC Sources - Operating B 3.8.1 The onsite standby power source for 4.16 kV ESF buses 1 E, 1 F, and 1 G consists of three DGs. DGs 1A and 1 Care dedicated to ESF buses 1 E and 1 G, respectively. DG 1 B (the swing DG) is a shared power source and can supply either Unit 1 ESF bus 1 F or Unit 2 ESF bus 2F. A DG starts automatically on a loss of coolant accident (LOCA) signal (i.e., low reactor water level signal or high drywell pressure signal) or on an ESF bus degraded voltage or undervoltage signal. After the DG has started, it automatically ties to its respective bus after offsite power is tripped as a consequence of ESF bus undervoltage or degraded voltage, independent of or coincident with a LOCA signal. The DGs also start and operate in the standby mode without tying to the ESF bus on a LOCA signal alone. Following the trip of offsite power, load shed relays strip nonpermanent loads from the ESF bus. When the DG is tied to the ESF bus, loads are then sequentially connected to its respective ESF bus by the automatic load sequence timing devices. The sequencing logic controls the permissive and starting signals to motor breakers to prevent overloading the DG.

In the event of a loss of preferred power, the ESF electrical loads are automatically connected to the DGs in sufficient time to provide for safe reactor shutdown and to mitigate the consequences of a Design Basis Accident (OBA) such as a LOCA.

Certain required plant loads are returned to service in a predetermined sequence in order to prevent overloading of the DGs in the process.

After the initiating signal is received, all automatic and permanently connected loads needed to recover the unit or maintain it in a safe condition are returned to service (i.e., the loads are energized.)

DGs 1A, 1 B, and 1 C have the following ratings:

~

2850 kV\/ 1000 hours0.0116 days <br />0.278 hours <br />0.00165 weeks <br />3.805e-4 months <br />, and b-,.

3250 kW 168 hours0.00194 days <br />0.0467 hours <br />2.777778e-4 weeks <br />6.3924e-5 months <br />.

A description of the Unit 2 onsite power sources is provided in the Bases for Unit 2 LCO 3.8.1.

B 3.8-2

( continued)

REVISION 1

BASES SURVEILLANCE REQUIREMENTS

( continued)

!greater than 90%

HATCH UNIT 1 AC Sources - Operating B 3.8.1 respectively. These values are equal to +/- 2% of the 60 Hz nominal frequency and are derived from the recommendations found in Regulatory Guide 1.9 (Ref. 9).

The SRs are modified by a NOTE to indicate that SR 3.8.1.1 through SR 3.8.1.18 apply only to the Unit 1 AC sources, and that SR 3.8.1.19 applies only to the Unit 2 AC sources.

SR 3.8.1.1 This SR ensures proper circuit continuity for the offsite AC electrical power supply to the onsite distribution network and availability of offsite AC electrical power. The breaker alignment verifies that each breaker is in its correct position to ensure that distribution buses and loads are connected to their preferred power source and that appropriate independence of offsite circuits is maintained. The Surveillance Frequency is controlled under the Surveillance Frequency Control Program.

SR 3.8.1.2 This SR helps to ensure the availability of the standby electrical power u

I to mitigate DBAs and transients and maintain the unit in a safe shutdown con that the D s are capable of proper startup, synchronizing, and accepting a loa apprmEiA:ia~ely m of the continuous load rating. This demonstrates DG capability while minimizing the mechanical stress and wear on the engine. A minimum run time of 60 minutes is required to stabilize engine temperatures, while minimizing the time that the DG is connected to the offsite source.

Although no power factor requirements are established by this SR, the DG is normally operated at a power factor between 0.8 lagging and 1.0. The 0.8 value is the design rating of the machine, while 1.0 is an operational limitation.

To minimize the wear on moving parts that do not get lubricated when the engine is not running, this SR has been modified by a Note (Note 2) to indicate that all DG starts for this Surveillance may be preceded by an engine prelube period and followed by a warmup prior to loading.

For the purposes of this testing, the DGs are started from standby conditions. Standby conditions for a DG mean that the diesel engine coolant and oil are being continuously circulated and temperature is being maintained consistent with manufacturer recommendations.

In order to reduce stress and wear on diesel engines, the DG (continued)

B3.8-17 REVISION 122

BASES SURVEILLANCE REQUIREMENTS greater than 90%

of the continuous rating HATCH UNIT 1 SR 3.8.1.4 (continued)

AC Sources - Operating B 3.8.1 This is a means of controlling microbiological fouling. In addition, it eliminates the potential for water entrainment in the fuel oil during DG operation. Water in the day tank may come from condensation, rain water, contaminated fuel oil, and breakdown of the fuel oil by bacteria.

Checking for and removal of accumulated water minimizes fouling and provides data regarding the watertight integrity of the fuel oil system.

The Surveillance Frequency is controlled under the Surveillance Frequency Control Program. This SR is for preventive maintenance.

The presence of water does not necessarily represent a failure of this SR provided that accumulated water is removed during performance of this Surveillance.

SR 3.8.1.5 This SR helps to ensure the availability of the standby electrical power supply to mitigate DBAs and transients and maintain the unit in a safe shutdown condition. This Surveillance verifies that the DGs are capable of a "fast cold" start, synchronizing, and accepting a load

-"7 R=I0Fe olosely siR11,1lating aooident loads. A minimum run time of 60 minutes is required to stabilize engine temperatures, while minimizing the time that the DG is connected to the offsite source.

SR 3.8.1.5 requires that the DG starts from standby conditions and achieves required voltage and frequency within 12 seconds. The 12 second start requirement supports the assumptions in the design basis LOCA analysis of FSAR Chapter 6 (Ref. 4 ). Once voltage and frequency requirements are demonstrated, the DG may be tied to its respective 4160 V emergency bus, as directed by SR 3.8.1.2.b. When the DG is tied to its bus, the electrical grid, due to its much larger size compared to the DG, will dictate DG voltage and frequency. The DG operator cannot adjust either parameter. Therefore, the voltage and frequency requirements of SR 3.8.1.2.a no longer apply while the DG is tied to its bus and need not be met to satisfy the requirements of SR 3.8.1.2.b. Other SRs, notably SR 3.8.1.9, require that voltage and frequency requirements can be met while the DG is supplying load.

For the purposes of this testing, the DGs are started from standby conditions. Standby conditions for a DG mean that the diesel engine coolant and oil are being continuously circulated and temperature is being maintained consistent with manufacturer recommendations.

Although no power factor requirements are established by this SR, the DG is normally operated at a power factor between 0.8 lagging (continued)

B 3.8-20 REVISION 122

BASES BACKGROUND (continued)

HATCH UNIT 2 AC Sources - Operating B 3.8.1 The onsite standby power source for 4.16 kV ESF buses 2E, 2F, and 2G consists of three DGs. DGs 2A and 2C are dedicated to ESF buses 2E and 2G, respectively. DB 1 B (the swing DG) is a shared power source and can supply either Unit 1 ESF bus 1 F or Unit 2 ESF bus 2F. A DG starts automatically on a loss of coolant accident (LOCA) signal (i.e., low reactor water level signal or high drywell pressure signal) or on an ESF bus degraded voltage or undervoltage signal. After the DG has started, it automatically ties to its respective bus after offsite power is tripped as a consequence of ESF bus undervoltage or degraded voltage, independent of or coincident with a LOCA signal. The DGs also start and operate in the standby mode without tying to the ESF bus on a LOCA signal alone. Following the trip of offsite power, load shed relays strip nonpermanent loads from the ESF bus. When the DG is tied to the ESF bus, loads are then sequentially connected to its respective ESF bus by the automatic load sequence timing devices. The sequencing logic controls the permissive and starting signals to motor breakers to prevent overloading the DG.

In the event of a loss of preferred power, the ESF electrical loads are automatically connected to the DGs in sufficient time to provide for safe reactor shutdown and to mitigate the consequences of a Design Basis Accident (OBA) such as a LOCA.

Certain required plant loads are returned to service in a predetermined sequence in order to prevent overloading of the DGs in the process.

After the initiating signal is received, all automatic and permanently connected loads needed to recover the unit or maintain it in a safe condition are returned to service (i.e., the loads are energized.)

Ratings for the DGs satisfy the requirements of Regulatory Guide 1.9 (Ref. 3). DGs 2A, 1 B and 2C have the following ratings:

a.

2850 kW - continuous,

b.

3100 kW - 2000 hours0.0231 days <br />0.556 hours <br />0.00331 weeks <br />7.61e-4 months <br />,

c.

3250 kW - 300 hours0.00347 days <br />0.0833 hours <br />4.960317e-4 weeks <br />1.1415e-4 months <br />, and

d.

3500 kW - 30 minutes.

OG 1 B has the following ratings:

a-,.

2850 kV\/ 1000 hours0.0116 days <br />0.278 hours <br />0.00165 weeks <br />3.805e-4 months <br />, and B 3.8-2

( continued)

REVISION 1

BASES BACKGROUND (continued)

APPLICABLE SAFETY ANALYSES LCO HATCH UNIT 2 3250 kV\/

168 hm.irs.

AC Sources - Operating B 3.8.1 A description of the Unit 1 onsite power sources is provided in the Bases for Unit 1 LCO 3.8.1.

The initial conditions of the containment post-LOCA response analyses (Ref. 4) and of the OBA and transient analyses (Ref. 5),

assume ESF systems are OPERABLE. The AC electrical power sources are designed to provide sufficient capacity, capability, redundancy, and reliability to ensure the availability of necessary power to ESF systems so that the fuel, Reactor Coolant System (RCS), and containment design limits are not exceeded. These limits are discussed in more detail in the Bases for Section 3.2, Power Distribution Limits; Section 3.5, Emergency Core Cooling System (ECCS) and Reactor Core Isolation Cooling (RCIC) System; and Section 3.6, Containment Systems.

The OPERABILITY of the AC electrical power sources is consistent with the initial assumptions of the accident analyses and is based upon meeting the design basis of the unit. This includes maintaining the onsite or offsite AC sources OPERABLE during accident conditions in the event of:

a.

An assumed loss of all offsite power sources or all onsite AC power sources; and

b.

A postulated worst case single failure.

AC sources satisfy Criterion 3 of the NRC Policy Statement (Ref. 13).

Two of three qualified circuits between the offsite transmission network and the onsite Unit 2 Class 1 E Distribution System and three separate and independent DGs (2A, 2C, and 1 B) ensure availability of the required power to shut down the reactor and maintain it in a safe shutdown condition after an anticipated operational occurrence (AOO) or a postulated OBA. In addition, some components required by Unit 2 are powered from Unit 1 sources (i.e., Standby Gas Treatment (SGT) System, low pressure coolant injection (LPCI) valve load centers, Main Control Room Environmental Control (MCREC)

System, and Control Room Air Conditioning (AC) System). For SGT, one qualified circuit between the offsite transmission network and the onsite Unit 1 Class 1 E Distribution System and one Unit 1 DG (1A or 1 C) must also be OPERABLE.

(continued)

B 3.8-3 REVISION 111

BASES SURVEILLANCE REQUIREMENTS

( continued)

HATCH UNIT 2 SR 3.8.1.1 AC Sources - Operating B 3.8.1 This SR ensures proper circuit continuity for the offsite AC electrical power supply to the onsite distribution network and availability of offsite AC electrical power. The breaker alignment verifies that each breaker is in its correct position to ensure that distribution buses and loads are connected to their preferred power source and that appropriate independence of offsite circuits is maintained. The Surveillance Frequency is controlled under the Surveillance Frequency Control Program.

SR 3.8.1.2 This SR helps to ensure the availability of the standby electrical power supply to mitigate DBAs and transients and maintain the unit in a safe shutdown condition, and verifies that the DGs are capable of pro startup, synchronizing, and accepting a load apprmEiA:ia~el;<<.b.L.J.>,<.C...--...

continuous load rating. This demonstrates DG capability while minimizing the mechanical stress and wear on the engine. A minimum run time of 60 minutes is required to stabilize engine temperatures, while minimizing the time that the DG is connected to the offsite source.

Although no power factor requirements are established by this SR, the DG is normally operated at a power factor between 0.8 lagging and 1.0. The 0.8 value is the design rating of the machine, while 1.0 is an operational limitation.

To minimize the wear on moving parts that do not get lubricated when the engine is not running, this SR has been modified by a Note, (Note 2) to indicate that all DG starts for this Surveillance may be preceded by an engine prelube period and followed by a warmup prior to loading.

For the purposes of this testing, the DGs are started from standby conditions. Standby conditions for a DG mean that the diesel engine coolant and oil are being continuously circulated and temperature is being maintained consistent with manufacturer recommendations.

In order to reduce stress and wear on diesel engines, the DG manufacturer recommends a modified start in which the starting speed of DGs is limited, warmup is limited to this lower speed, and the DGs are gradually accelerated to synchronous speed prior to loading.

These start procedures are the intent of Note 3. Once voltage and frequency requirements are demonstrated, the DG may be tied to its respective 4160 V emergency bus, as directed by SR 3.8.1.2.b.

(continued)

B3.8-17 REVISION 134 greater than 90%

BASES SURVEILLANCE REQUIREMENTS greater than 90% of the continuous rating HATCH UNIT 2 SR 3.8.1.4 (continued)

AC Sources - Operating B 3.8.1 The Surveillance Frequency is controlled under the Surveillance Frequency Control Program.

SR 3.8.1.5 This SR helps to ensure the availability of the standby electrical power supply to mitigate DBAs and transients and maintain the unit in a safe shutdown condition. This Surveillance verifies that the DGs are capable of a "fast cold" start, synchronizing, and accepting a load R=I0Fe olosely siR11,1lating aooident loads. A minimum run time of 60

/

minutes is required to stabilize engine temperatures, while minimizing the time that the DG is connected to the offsite source.

SR 3.8.1.5 requires that the DG starts from standby conditions and achieves required voltage and frequency within 12 seconds. The 12 second start requirement supports the assumptions in the design basis LOCA analysis of FSAR, Chapter 6 (Ref. 4 ). Once voltage and frequency requirements are demonstrated, the DG may be tied to its respective 4160 V emergency bus, as directed by SR 3.8.1.2.b.

When the DG is tied to its bus, the electrical grid, due to its larger size compared to the DG, will dictate DG voltage and frequency. The DG operator cannot adjust either parameter. Therefore, the voltage and frequency requirements of SR 3.8.1.2.a no longer apply while the DG is tied to its bus and need not be met to satisfy the requirements of SR 3.8.1.2.b. Other SRs, notably SR 3.8.1.9, require that voltage and frequency requirements can be met while the DG is supplying load.

For the purposes of this testing, the DGs are started from standby conditions. Standby conditions for a DG mean that the diesel engine coolant and oil are being continuously circulated and temperature is being maintained consistent with manufacturer recommendations.

Although no power factor requirements are established by this SR, the DG is normally operated at a power factor between 0.8 lagging and 1.0. The 0.8 value is the design rating of the machine, while 1.0 is an operational limitation.

The Surveillance Frequency is controlled under the Surveillance Frequency Control Program.

To minimize the wear on moving parts that do not get lubricated when the engine is not running, this SR has been modified by a Note (Note 1) to indicate that all DG starts for this Surveillance may be preceded by an engine prelube period and followed by a warmup prior to loading.

(continued)

B 3.8-20 REVISION 134

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