05000266/LER-2018-001, Inadequate Protection from Tornado Missiles Identified Due to Nonconforming Conditions
| ML18116A140 | |
| Person / Time | |
|---|---|
| Site: | Point Beach  |
| Issue date: | 04/26/2018 |
| From: | Craven R Point Beach |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| NRC 2018-0015 LER 2018-001-00 | |
| Download: ML18116A140 (4) | |
| Event date: | |
|---|---|
| Report date: | |
| 2662018001R00 - NRC Website | |
text
April 26, 2018 U. S. Nuclear Regulatory Commission ATTN : Document Control Desk Washington, DC 20555 Point Beach Nuclear Plant, Units 1 and 2 Docket 50-266 and 50-301 Renewed License Nos. DPR-24 and DPR-27 Licensee Event Report 266/2018-001-00 NEXTeraM ENERGY.
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NRC 2018-0015 10 CFR 50.73 Enclosed is Licensee Event Report (LER) 266/2018-001-00 for Point Beach Nuclear Plant, Units 1 and 2. NextEra Energy Point Beach, LLC is providing this LER related to tornado missile protection for Units 1 and 2.
This letter contains no new regulatory commitments.
If you have any questions please contact Mr. Eric Schultz, Licensing Manager, at (920) 755-7854.
Sincerely, NextEra Energy Point Beach, LLC Robert Craven Plant General Manager Enclosure cc:
Administrator, Region Ill, USNRC Project Manager, Point Beach Nuclear Plant, USNRC Resident Inspector, Point Beach Nuclear Plant, USNRC PSCW NextEra Energy Point Beach, LLC 6610 Nuclear Road, Two Rivers, WI 54241
NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION APPROVED BY OMB: NO. 3150-0104 EXPIRES: 03/31/2020 (04-2018)
, the NRC may not conduct or sponsor, and a person is not required to respond to, the information collection.
- 3. LER NUMBER YEAR Point Beach Nuclear Plant Unit 1 05000-266 2018 SEQUENTIAL NUMBER
- - 001 REV NO.
- - 00 Also, as documented in EGM 15-002, Revision 1, the NRC has completed a generic risk analysis of potential tornado missile protection noncompliances to examine the risk significance. The assessment documented a conservative, bounding-type analysis of the risk significance for plant facilities that may not be in compliance with their tornado missile protection licensing. The generic analysis assumed that core damage would occur if a tornado were to strike a plant located in the most active tornado region in the country and that it caused a tornado-generated missile to fail all emergency core cooling equipment at the plant with no ability to recover. Given this conservative assumption, the NRC study concluded that the core damage frequency (CDF) associated with tornado missile-related noncompliances is well below the CDF threshold requiring immediate regulatory action.
In summary, the generic bounding risk analysis performed by the NRC concluded that this issue is of low risk significance.
Corrective Actions
Immediate compensatory measures were implemented in accordance with the guidance in EGM 15-002, Revision 1, and Interim Staff Guidance, DSS-ISG-2016-01, Clarification of Licensee Actions in Receipt of Enforcement Discretion per Enforcement Guidance Memorandum EGM 15-002, Revision 1.
Comprehensive compensatory measures are under development and will be implemented within 60 days of the date of discovery of the initial nonconformances.
Long term resolution will include submittal of a license amendment request to resolve the identified legacy nonconformances.
Similar Events
On June 25, 2012, Point Beach submitted Licensee Event Report (LER) 266/2012-001-00 applicable to both Units 1 and 2. The LER voluntarily reported a lack of tornado missile protection for the Train A emergency diesel generator (G01 and G02) exhaust stacks. The diesel generators were declared inoperable and a temporary modification was implemented to provide physical protection for the exhaust stacks. The diesel generators were returned to service within the Technical Specification Action Condition completion time.
Component Failure Data
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