ML19207A001
| ML19207A001 | |
| Person / Time | |
|---|---|
| Site: | Saint Lucie  |
| Issue date: | 07/23/2019 |
| From: | Michael Wentzel Plant Licensing Branch II |
| To: | Becker C State of FL, Dept of Health |
| References | |
| Download: ML19207A001 (3) | |
Text
NRR-DRMAPEm Resource From: Wentzel, Michael Sent: Tuesday, July 23, 2019 12:44 PM To: Becker, Cindy L
Subject:
NRC Notification of State of Florida Regarding St. Lucie Exigent License Amendment -
One-time Extension of the Allowed Outage Time for an Inoperable EDG Importance: High Ms. Becker, The U.S. Nuclear Regulatory Commission (NRC) is preparing to issue an exigent license amendment for the St. Lucie Plant, Unit No. 1 In accordance with Title 10 of the Code of Federal Regulations (10 CFR), Section 50.91(b), I am notifying you of the proposed issuance of this amendment.
Please reply if the State of Florida has comments on the following licensing action submitted to the NRC by Florida Power & Light Company (the licensee): Exigent Technical Specification Amendment Request - One-Time Allowed Outage Time Extension for Inoperable EDG, dated July 19, 2019 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML19200A283).
Because of the exigent nature of the request, the proposed no significant hazards consideration is being published in the local media in the vicinity of the plant. The proposed no significant hazards consideration is provided to you below for your reference.
Your response, if any, is requested by July 25, 2019. If you have any questions, please call me at (301) 415-6459.
Thank you, Mike Wentzel Michael Wentzel Project Manager NRR/DORL/LPLII-2 (301) 415-6459 michael.wentzel@nrc.gov Proposed No Significant Hazards Consideration
- 1. Does the proposed change involve a significant increase in the probability or consequences of an accident previously evaluated?
Response: No The proposed license amendment provides a one-time 30 day AOT allowance in TS 3/4.8.1, Action b for one EDG. This change will have no effect on accident probabilities since the EDGs are not considered accident initiators. The proposed AOT extension does not require any physical plant modifications. Since no individual precursors of an accident are affected, the proposed amendment does not increase the probability of a previously analyzed event.
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The consequences of an evaluated accident are determined by the operability of plant systems designed to mitigate those consequences. The EDGs are backup power to components that mitigate the consequences of accidents. The current TSs normally permit a single EDG to be inoperable for up to 14 days. The proposed license amendment extends the current AOT for the 1B EDG on a one-time basis, to no more than a total of 30 days. The proposed change does not affect any of the assumptions used in deterministic safety analysis.
Granting the proposed change will not adversely affect the consequences of an accident previously evaluated.
Therefore, the proposed amendment does 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 accident previously evaluated?
Response: No Creation of the possibility of a new or different kind of accident requires creating one or more new accident precursors. New accident precursors may be created by modifications of plant configuration, including changes in allowable modes of operation.
The proposed amendment provides a one-time allowance of a 30 day AOT for TS 3/4.8.1, Action b. This change does not involve a modification or the physical configuration of the plant (i.e., no new equipment will be installed), create any new failure modes for existing equipment, or create any new limiting single failures. The plant equipment considered available when evaluating the existing AOT remains unchanged.
The extended AOT will permit completion of repair activities without incurring transient risks associated with performing a unit shutdown with the EOG unavailable.
Therefore, the proposed amendment does 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 a margin of safety?
Response: No The proposed license amendment provides a risk-informed, one-time allowance of a 30 day AOT for TS 3/4.8.1, Action b. A deterministic evaluation of the proposed AOT demonstrates there is sufficient margin to safety during the extended EDG AOT period. During the extended AOT times, sufficient compensatory measures will be established to maintain the defense-in-depth design philosophy to ensure the electrical power system meets its design safety function.
Therefore, the proposed amendment does not result in a significant reduction in the margin of safety.
The NRC staff has reviewed the licensee's analysis and, based on this review, it appears that the three standards of 10 CFR 50.92(c) are satisfied. Therefore, the NRC staff proposes to determine that the amendment request involves no significant hazards consideration.
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Hearing Identifier: NRR_DRMA Email Number: 137 Mail Envelope Properties (BL0PR0901MB32503E5C1B9DA2710B565C99E7C70)
Subject:
NRC Notification of State of Florida Regarding St. Lucie Exigent License Amendment - One-time Extension of the Allowed Outage Time for an Inoperable EDG Sent Date: 7/23/2019 12:43:59 PM Received Date: 7/23/2019 12:43:59 PM From: Wentzel, Michael Created By: Michael.Wentzel@nrc.gov Recipients:
"Becker, Cindy L" <Cindy.Becker@flhealth.gov>
Tracking Status: None Post Office: BL0PR0901MB3250.namprd09.prod.outlook.com Files Size Date & Time MESSAGE 4739 7/23/2019 12:43:59 PM Options Priority: High Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date:
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