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Category:- No Document Type Applies
MONTHYEARML23108A2202023-04-13013 April 2023
Attachment: Table 1 RV-1 Relief Valve Descriptions
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Relief Request 1A4-1, Reactor Vessel (Rv) Upper Head Examinations
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Certificate of Liability Insurance
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Attachment 2 - NRC Working Group Recommendations to Revise the Substantive Cross-Cutting Issue Process
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Discussion of NRC Requirements for Water Inventory Needed to Maintain Safety of Comanche Peak Nuclear Power Plant
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CDBI Findings
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Examples of Max Thermal Power License Conditions
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P. Paquin Ltr Amendment to Certificate of Compliance No. 6574 for the Model No. 3-82B Package (TAC L24116)/ Register User List
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Plant Service List
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Description of Pictures Txu Comanche Peak Ses Report #06-0413
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Enclosure 4: CPSES Comments on and Input to NRC Draft Trip Report
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Order EA-03-009 Service List
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Riv Backfit Status
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Westinghouse - Nuclear Safety Advisory Letter NSAL-03-6, High Net Heat Input, Dated 08/20/2003
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Riv Backfit Status
2023-04-13
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Discussion of NRC requirements for water inventory needed to maintain safety of Comanche Peak Nuclear Power Plant The Nuclear Regulatory Commission (NRC) has established requirements to Comanche Peak Nuclear Power Plant (Comanche Peak) and other licensees for the conditions necessary to safely operate, shutdown, and cooldown a nuclear power plant. The requirements also specify that a water source be available at all times during plant operations to provide sufficient cooling for at least 30 days to cool down the nuclear reactor(s) and maintain them in a safe shutdown condition.
The NRC does not require Lake Granbury water levels be maintained above a minimum level because level in that lake does not affect the safe shutdown of Comanche Peak Units 1 and 2.
During the licensing of Comanche Peak Units 1 and 2, the NRC required and approved design and technical specifications that prescribed how the nuclear reactors were to be operated and safely shutdown. These specifications require that Comanche Peak maintain a water level of 770 feet above mean sea level in the body of water which is formed by a cove of the Squaw Creek Reservoir and is retained by a seismically qualified dam. Maintaining this water level ensures that enough water will be available (30 day supply) under all considered scenarios to provide cooling for safe shutdown of both units without relying on water from Lake Granbury in an emergency.
Although no license has been granted for Comanche Peak Units 3 and 4, design requirements and specifications would likely be similar. Therefore, the water levels in Lake Granbury would not affect their safe operation or shutdown and cooldown and they would not depend on water from Lake Granbury in an emergency.
