Seriously Degraded
A degraded condition. “Any event or condition that results in:(A) The condition of the nuclear power plant, including its principal safety barriers, being seriously degraded; or"
An LER is required for a seriously degraded principal safety barrier or an unanalyzed condition that significantly degrades plant safety. If not reported under 10 CFR 50.72(a), (b)(1), or (b)(2), an ENS notification is required under 10 CFR 50.72(b)(3) (an 8-hour report). On occasion, a
“Degraded or Unanalyzed Condition” is discovered to have occurred in the past, but is not ongoing at the time of discovery. ENS notifications and LERs are required if a Degraded or Unanalyzed Condition occurred within 3 years of the date of discovery, even if the event is not on-going at the time of discovery.
Combined Criteria: 10 CFR 50.72(b)(3)(ii), Degraded or Unanalyzed Condition
Discussion
(A) Nuclear Power Plant, Including Its Principal Safety Barriers, Being Seriously Degraded
This criterion applies to material (e.g., metallurgical or chemical) problems that cause abnormal degradation of or stress upon the principal safety barriers (i.e., the fuel cladding, reactor coolant system (RCS) pressure boundary, or the containment). Abnormal degradation of a barrier may be indicated by the necessity of taking corrective action to restore the barrier’s capability, as is the case in some of the examples discussed below. Abnormal stress upon a barrier may result from an unplanned transient, as is the case in one of the examples discussed below. The following are examples of reportable events and conditions:
- (1) Fuel cladding failures in the reactor, or in the storage pool, that exceed expected values, or that are unique or widespread, or that are caused by unexpected factors.
- (2) Welding or material defects in the primary coolant system that cannot be found acceptable under ASME Section XI, IWB-3600, “Analytical Evaluation of Flaws,” or ASME Section XI, Table IWB-3410-1, “Acceptance Standards.”
- (3) Serious steam generator tube degradation. A licensee’s plant-specific TS contain performance criteria for steam generator tube integrity, which includes structural integrity, accident induced leakage, and operational leakage. Steam generator tube degradation is considered serious only if either the steam generator structural integrity or accident-induced leakage performance criteria are not met.
- In addition, one or more steam generator tubes satisfying the tube repair criteria and not plugged or repaired in accordance with the steam generator program is not considered to be serious steam generator tube degradation and therefore is not reportable as a “Degraded or Unanalyzed Condition,” as long as the structural integrity and accident-induced leakage performance criteria are both met.
- (4) Low temperature over pressure transients in which the pressure-temperature relationship violates pressure-temperature limits derived from Appendix G, “Fracture Toughness Requirements,” to 10 CFR Part 50 (e.g., TS pressure-temperature curves).
- (5) Loss of containment function or integrity, including containment leak rate tests in which the total containment as-found, minimum-pathway leak rate exceeds limits in the facility’s TS.<ref>The LCO typically employs La, which is defined in Appendix J, “Primary Reactor Containment Leakage Testing for Water-Cooled Power Reactors,” to 10 CFR Part 50 as the maximum allowable containment leak rate at pressure Pa, the calculated peak containment internal pressure related to the design-basis accident. “Minimum pathway leak rate” means the minimum leak rate that can be attributed to a penetration leakage path; for example, the smaller of either the inboard or outboard valve’s individual leak rates.</ref>
(B) The nuclear power plant being in an unanalyzed condition that significantly degrades plant safety.
Examples
(1) Failures of Reactor Fuel Rod Cladding Identified during Testing of Fuel Assemblies
Radiochemistry data for a particular PWR indicated that a number of fuel rods had failed during the first few months of operation. Projections ranged from 6 to 12 failed rods.
The end-of-cycle RCS iodine-131 activity averaged 0.025 microcuries per milliliter.
Following the end-of-cycle shutdown, iodine-131 spiked to 11.45 microcuries per milliliter. The cause was a significant number of failed fuel rods. Inspections revealed that 136 of the total 157 fuel assemblies contained failed fuel (approximately 300 fuel rods had through-wall penetrations), far exceeding the anticipated number of failures.
The defects were generally pinhole sized. The fuel cladding failures were caused by long-term fretting from debris that became lodged between the lower fuel assembly nozzle and the first spacer grid, resulting in penetration of the stainless-steel fuel cladding. The source of the debris was apparently a machining byproduct from the thermal shield support system repairs during the previous refueling outage.
The event is reportable because the cladding failures exceed expected values and are unique or widespread.
(2) Reactor Coolant System Pressure Boundary Degradation Due to Corrosion of a Control Rod Drive Mechanism Flange
While the plant was in hot shutdown, a total of six control rod drive mechanism (CRDM) reactor vessel nozzle flanges were identified as leaking. Subsequently, one of the flanges was found to be eroded and pitted. While removing the nut ring from beneath the flange, it was discovered that approximately 50 percent of one of the nut ring halves had corroded away and that two of the four bolt holes in the corroded nut ring half were degraded to the point that there was no bolt–thread engagement.
An inspection of the flanges and spiral wound gaskets, which were removed from between the flanges, revealed that the cause of the leaks was the gradual deterioration of the gaskets from age. A replacement CRDM was installed and the gaskets on all six CRDMs were replaced with new-design graphite-type gaskets.
The event is reportable because there is a material defect in the primary coolant system that cannot be found acceptable under ASME Section XI.
(3) Degradation of Reactor Fuel Rod Cladding
Identified during Fuel Sipping Operations With the plant in cold shutdown, fuel sipping operations appeared to indicate that a significant portion of cycle 2 fuel, type “LYP,” had failed; i.e., 4 confirmed and 12 potential fuel leakers. The potential fuel leakers had only been sipped once before the ENS notification was made. The licensee contacted the fuel vendor for assistance onsite in evaluating this problem.
An ENS notification was made because the fuel cladding degradation was thought to be widespread. However, additional sipping operations and a subsequent evaluation by the licensee’s reactor engineering department with vendor assistance concluded that no additional fuel failures had occurred; i.e., the abnormal readings associated with the potential fuel leakers was attributed to fission products trapped in the crud layer. Based on the results of the evaluation, the licensee concluded that the fuel cladding was not seriously degraded and that the event was not reportable. Consequently, after discussion with the regional office, the licensee appropriately retracted this event.
References
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WEEKMONTHYEARENS 569742024-02-17T13:37:000Start date: 17 February 2024 13:37:00 Site: Brunswick Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 569592024-02-11T15:11:000Start date: 11 February 2024 15:11:00 Site: Hatch Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 569122024-01-03T17:57:000Start date: 3 January 2024 17:57:00 Site: Saint Lucie Reporting criterion: 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 568932023-12-16T01:45:000Start date: 16 December 2023 01:45:00 Site: Saint Lucie Reporting criterion: 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 568342023-11-05T16:33:000Start date: 5 November 2023 16:33:00 Site: Waterford Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 567852023-10-09T22:07:000Start date: 9 October 2023 22:07:00 Site: Palo Verde Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 567742023-10-03T15:54:000Start date: 3 October 2023 15:54:00 Site: North Anna Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 566852023-08-20T20:00:000Start date: 20 August 2023 20:00:00 Site: Fermi Reporting criterion: 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown, 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 534562023-07-15T10:39:000Start date: 15 July 2023 10:39:00 Site: Arkansas Nuclear Reporting criterion: 10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor, 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 564942023-04-30T05:00:000Start date: 30 April 2023 05:00:00 Site: Hope Creek Reporting criterion: 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 564852023-04-22T23:42:000Start date: 22 April 2023 23:42:00 Site: Beaver Valley Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 564742023-04-15T15:12:000Start date: 15 April 2023 15:12:00 Site: Turkey Point Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 564342023-03-26T20:03:000Start date: 26 March 2023 20:03:00 Site: Susquehanna Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 564212023-03-18T18:10:000Start date: 18 March 2023 18:10:00 Site: Nine Mile Point Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 564112023-03-15T03:57:000Start date: 15 March 2023 03:57:00 Site: Browns Ferry Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 563712023-02-18T10:39:000Start date: 18 February 2023 10:39:00 Site: Browns Ferry Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 563422023-02-07T22:38:000Start date: 7 February 2023 22:38:00 Site: Hatch Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 562572022-12-03T16:00:000Start date: 3 December 2022 16:00:00 Site: Browns Ferry Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 562212022-11-14T11:30:000Start date: 14 November 2022 11:30:00 Site: Oconee Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 561972022-11-01T18:33:000Start date: 1 November 2022 18:33:00 Site: Oconee Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 561762022-10-23T15:30:000Start date: 23 October 2022 15:30:00 Site: Diablo Canyon Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 561652022-10-15T15:59:000Start date: 15 October 2022 15:59:00 Site: Catawba Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 561532022-10-07T06:19:000Start date: 7 October 2022 06:19:00 Site: Braidwood Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 558572022-04-23T13:54:000Start date: 23 April 2022 13:54:00 Site: Byron Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 557062022-01-16T05:20:000Start date: 16 January 2022 05:20:00 Site: Browns Ferry Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 555742021-11-12T21:05:000Start date: 12 November 2021 21:05:00 Site: Turkey Point Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 555602021-11-03T19:31:000Start date: 3 November 2021 19:31:00 Site: Columbia Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 555402021-10-22T05:04:000Start date: 22 October 2021 05:04:00 Site: Beaver Valley Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 555062021-10-04T19:33:000Start date: 4 October 2021 19:33:00 Site: Arkansas Nuclear Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 554572021-09-12T21:28:000Start date: 12 September 2021 21:28:00 Site: North Anna Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 552752021-05-25T21:51:000Start date: 25 May 2021 21:51:00 Site: Catawba Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 552012021-04-21T02:30:000Start date: 21 April 2021 02:30:00 Site: Catawba Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 551222021-03-04T08:23:000Start date: 4 March 2021 08:23:00 Site: Calvert Cliffs Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 549942020-11-11T18:11:000Start date: 11 November 2020 18:11:00 Site: Watts Bar Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 549712020-10-29T14:30:000Start date: 29 October 2020 14:30:00 Site: Peach Bottom Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 549302020-10-03T14:13:000Start date: 3 October 2020 14:13:00 Site: Point Beach Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 548972020-09-11T23:30:000Start date: 11 September 2020 23:30:00 Site: Palisades Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 547072020-05-13T02:20:000Start date: 13 May 2020 02:20:00 Site: Catawba Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 546802020-04-24T05:30:000Start date: 24 April 2020 05:30:00 Site: Beaver Valley Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 546142020-03-26T07:00:000Start date: 26 March 2020 07:00:00 Site: McGuire Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 544632020-01-04T16:09:000Start date: 4 January 2020 16:09:00 Site: Hatch Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 543372019-10-17T23:51:000Start date: 17 October 2019 23:51:00 Site: Beaver Valley Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 540312019-04-26T16:47:000Start date: 26 April 2019 16:47:00 Site: River Bend Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 539592019-03-26T15:30:000Start date: 26 March 2019 15:30:00 Site: Browns Ferry Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 538372019-01-18T19:33:000Start date: 18 January 2019 19:33:00 Site: Waterford Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 538342019-01-17T06:00:000Start date: 17 January 2019 06:00:00 Site: Waterford Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 537492018-11-21T05:00:000Start date: 21 November 2018 05:00:00 Site: Palisades Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 537342018-11-11T04:00:000Start date: 11 November 2018 04:00:00 Site: Palisades Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 537332018-11-10T05:00:000Start date: 10 November 2018 05:00:00 Site: Palisades Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 537112018-11-01T04:00:000Start date: 1 November 2018 04:00:00 Site: Beaver Valley Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 536522018-10-08T05:00:000Start date: 8 October 2018 05:00:00 Site: Braidwood Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 536462018-10-05T05:00:000Start date: 5 October 2018 05:00:00 Site: Cooper Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 536172018-09-21T04:00:000Start date: 21 September 2018 04:00:00 Site: Peach Bottom Reporting criterion: 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown, 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 535982018-09-11T04:00:000Start date: 11 September 2018 04:00:00 Site: Saint Lucie Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 535892018-09-07T04:00:000Start date: 7 September 2018 04:00:00 Site: Indian Point Reporting criterion: 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown, 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 533932018-05-08T06:39:000Start date: 8 May 2018 06:39:00 Site: Farley Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 533542018-04-20T22:30:000Start date: 20 April 2018 22:30:00 Site: Braidwood Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 533352018-04-13T17:08:000Start date: 13 April 2018 17:08:00 Site: Grand Gulf Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 533262018-04-11T18:30:000Start date: 11 April 2018 18:30:00 Site: Harris Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 533052018-03-31T04:00:000Start date: 31 March 2018 04:00:00 Site: Indian Point Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 533032018-03-30T18:05:000Start date: 30 March 2018 18:05:00 Site: Clinton Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded, 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material ENS 532872018-03-25T20:16:000Start date: 25 March 2018 20:16:00 Site: Pilgrim Reporting criterion: 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition, 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 532762018-03-22T08:00:000Start date: 22 March 2018 08:00:00 Site: LaSalle Reporting criterion: 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown, 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 531852018-01-26T13:53:000Start date: 26 January 2018 13:53:00 Site: Ginna Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 530482017-11-01T17:25:000Start date: 1 November 2017 17:25:00 Site: Dresden Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 530422017-10-30T09:04:000Start date: 30 October 2017 09:04:00 Site: Point Beach Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 530312017-10-23T08:00:000Start date: 23 October 2017 08:00:00 Site: Peach Bottom Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 530192017-10-16T19:25:000Start date: 16 October 2017 19:25:00 Site: Prairie Island Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 529472017-09-05T15:11:000Start date: 5 September 2017 15:11:00 Site: Three Mile Island Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded, 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material ENS 528942017-08-09T20:06:000Start date: 9 August 2017 20:06:00 Site: Surry Reporting criterion: 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown, 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 527502017-05-12T05:45:000Start date: 12 May 2017 05:45:00 Site: Clinton Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 527442017-05-10T18:11:000Start date: 10 May 2017 18:11:00 Site: Pilgrim Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 527382017-05-08T13:25:000Start date: 8 May 2017 13:25:00 Site: Limerick Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 527222017-05-02T13:28:000Start date: 2 May 2017 13:28:00 Site: Palisades Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 525922017-03-05T14:00:000Start date: 5 March 2017 14:00:00 Site: Byron Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 525912017-03-03T23:05:000Start date: 3 March 2017 23:05:00 Site: Byron Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 525812017-02-28T15:00:000Start date: 28 February 2017 15:00:00 Site: Salem Reporting criterion: 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown, 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 525732017-02-24T00:22:000Start date: 24 February 2017 00:22:00 Site: McGuire Reporting criterion: 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown, 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 525672017-02-20T04:23:000Start date: 20 February 2017 04:23:00 Site: Hatch Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 525232017-01-31T17:00:000Start date: 31 January 2017 17:00:00 Site: Saint Lucie Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 525032017-01-22T19:00:000Start date: 22 January 2017 19:00:00 Site: FitzPatrick Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 524902017-01-14T11:13:000Start date: 14 January 2017 11:13:00 Site: FitzPatrick Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 524432016-12-19T07:20:000Start date: 19 December 2016 07:20:00 Site: Columbia Reporting criterion: 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 524152016-12-07T23:00:000Start date: 7 December 2016 23:00:00 Site: Three Mile Island Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 523092016-10-20T01:30:000Start date: 20 October 2016 01:30:00 Site: Palo Verde Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 522972016-10-15T12:57:000Start date: 15 October 2016 12:57:00 Site: Harris Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 522752016-10-02T21:00:000Start date: 2 October 2016 21:00:00 Site: Braidwood Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 521372016-07-30T15:52:000Start date: 30 July 2016 15:52:00 Site: North Anna Reporting criterion: 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown, 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 519872016-06-08T06:26:000Start date: 8 June 2016 06:26:00 Site: Susquehanna Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 519832016-06-06T09:56:000Start date: 6 June 2016 09:56:00 Site: Susquehanna Reporting criterion: 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown, 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 519392016-05-17T14:45:000Start date: 17 May 2016 14:45:00 Site: Clinton Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 519102016-05-05T12:00:000Start date: 5 May 2016 12:00:00 Site: Palo Verde Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 518612016-04-11T12:35:000Start date: 11 April 2016 12:35:00 Site: Palo Verde Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 518372016-03-30T21:15:000Start date: 30 March 2016 21:15:00 Site: Davis Besse Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 518172016-03-22T23:34:000Start date: 22 March 2016 23:34:00 Site: McGuire Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 518092016-03-21T01:54:000Start date: 21 March 2016 01:54:00 Site: Limerick Reporting criterion: 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown, 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 517922016-03-15T11:49:000Start date: 15 March 2016 11:49:00 Site: Point Beach Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 517472016-02-20T08:30:000Start date: 20 February 2016 08:30:00 Site: Calvert Cliffs Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 517422016-02-16T11:31:000Start date: 16 February 2016 11:31:00 Site: Hatch Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded ENS 515382015-11-13T22:45:000Start date: 13 November 2015 22:45:00 Site: Susquehanna Reporting criterion: 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded
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