ML25140A042
| ML25140A042 | |
| Person / Time | |
|---|---|
| Site: | FitzPatrick  |
| Issue date: | 05/21/2025 |
| From: | Constellation Energy Generation |
| To: | NRC/NRR/DORL/LPL1 |
| References | |
| EPID L-2025-LRM-0059 | |
| Download: ML25140A042 (1) | |
Text
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James A. FitzPatrick Nuclear Power Plant Elimination of Main Steam Tunnel Temperature High Isolation from TS 3.3.6.1 NRG Pre-Submittal Meeting 05/21/2025
2 Agenda Deletion of Main Steam Tunnel Area Temperature - High from Table 3.3.6.1-1 Addition of new Technical Specification 3.7.8 Main Steam Tunnel Area Temperature Discussion of Precedence Timeline Discussion and Feedback
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3 Deletion of Main Steam Tunnel Area Temperature - High from Table 3.3.6.1-1 JAFNPP License Amendment Request to eliminate the requirement for an automatic Main Steam Line Isolation from Main Steam Tunnel Area Temperature - High The temperature setpoint of 195°F allows for identification of leaks that allow preemptive actions to remove the unit from operation instead of requiring an automatic scram.
Controlled shutdown would be preferred to an automatic scram with a main steam line isolation which would be a complicated scram.
The MST Area Temperature - High Function is not assumed to actuate in any accident analysis.
The following TS functions will continue to provide automatic MSL isolation:
Reactor Vessel Water level - Low, Low, Low - Level 1 Main Steam Line Pressure - Low Main Steam Line Flow - High Condenser Vacuum - Low
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4 Additional of new Technical Specification 3.7.8 Main Steam Tunnel (MST) Area Temperature Additional of new Technical Specification 3.7.8 Main Steam Tunnel (MST) Area Temperature will require MST Area Temperature to be< 195°F.
Actions will require immediate verification that no Main Steam Line Pressure Boundary Leakage exists and follow up verification every 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> thereafter.
If the action is not complete or Main Steam Line Pressure Boundary Leakage exists, then a shutdown is required. The unit must be in Mode 3 in 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and Mode 4 in 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />.
This TS will allow for an orderly unit shutdown when leakage is detected prior to the flow rate corresponding to a critical crack size which will not propagate into a full pipe rupture for the Main Steam p1p1ng.
This new TS will prevent a shutdown when the elevated temperature is caused by changes in turbine building ventilation, high ambient temperatures seasonally, or failed instrumentation.
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5 Applicable Precedence Edwin I. Hatch Nuclear Plant Unit Nos. 1 and 2, "Request to Eliminate Automatic Main Steam Line Isolation on High Turbine Building Area Temperature" May 20, 2022 (ADAMS Accession No. ML22101A094).
Limerick Generating Station "License Amendment Request for Proposed Changes to the Technical Specification Isolation Actuation Instrumentation Tables and New Turbine Enclosure Main Steam Line Tunnel Temperature TS 3/4.7.9, July 29, 2024 (ADAMS Accession No. ML24204A071).
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6 Timeline LAR Submittal May 2025 Seeking NRC approval in 12 months Implementation in 30 Days
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Discussion/Questions 7
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