Licensee Event Report: Difference between revisions
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Latest revision as of 19:59, 15 March 2020
If a criteria is reached according to NUREG-1022 then a Licensee to the NRC must submit a Licensee Event Report to explain what happened.
Reporting Criteria
- 10 CFR 50.73(a)(1), Submit an LER
- 10 CFR 50.73(a)(2)(i)(A), Completion of TS Shutdown
- 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications (Text"Text" is a predefined property that represents text of arbitrary length and is provided by Semantic MediaWiki.: Any operation or condition which was prohibited by the plant's Technical Specifications)
- 10 CFR 50.73(a)(2)(i)(C), 50.54(x) TS Deviation
- 10 CFR 50.73(a)(2)(ii)(A), Seriously Degraded
- 10 CFR 50.73(a)(2)(ii)(B), Unanalyzed Condition
- 10 CFR 50.73(a)(2)(iv)(A), System Actuation
- 10 CFR 50.73(a)(2)(iv), System Actuation
- 10 CFR 50.73(a)(2)(ix)(A), Prevented Safety Function in Multiple System
- 10 CFR 50.73(a)(2)(v)(A), Loss of Safety Function - Shutdown the Reactor
- 10 CFR 50.73(a)(2)(v)(B), Loss of Safety Function - Remove Residual Heat
- 10 CFR 50.73(a)(2)(v)(C), Loss of Safety Function - Release of Radioactive Material
- 10 CFR 50.73(a)(2)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
- 10 CFR 50.73(a)(2)(v), Loss of Safety Function
- 10 CFR 50.73(a)(2)(vii), Common Cause Inoperability
Writing LERs
Explain exactly what happened during the entire event or condition, including how systems,components, and operating personnel performed. Do not cover specific hardware problems in excessive detail. Describe unique characteristics of a plant as well as other characteristics that influenced the event (favorably or unfavorably).
- Avoid using plant-unique terms and abbreviations, or, as a minimum, clearly define them.
- The audience for LERs is large and does not necessarily know the details of each plant.
- Include the root causes, the plant status before the event, and the sequence of occurrences.
- Describe the event from the perspective of the Operator (i.e., what the operator saw, did, perceived, understood, or misunderstood).
- If several systems actuate during an event, describe all aspects of the complete event, including all actuations sequentially, and those aspects that by themselves would not be reportable.
- For example, if a single component failure (generally not reportable) occurs following a reactor scram (reportable), describe the component failure in the narrative of the LER for the reactor scram.
- It is necessary to discuss the performance and status of equipment.
- Paraphrase pertinent sections of the latest submitted Safety analysis report (SAR) rather than referencing them because not all organizations or individuals have access to SARs.
- Extensive cross-referencing would be time consuming considering the large number of LERs and reviewers that read each LER.
- Ensure that each component's safety-significant effect on the event or condition is clearly and completely described.
- Do not use statements such as "this event is not significant with respect to the health and safety of the public" without explaining the basis for the conclusion.
Specific information that should be included, as appropriate, is described in paragraphs 50.73(b).
Submissions of LERs
Section 50.73(d) of the NUREG-1022 states that submmissions must be done with Form NRC 366 as described by section 50.4. Submissions are to be done within 60 days of the event. If that happens to be a weekend or a holiday then it must be the next working day. If a Licensee knows that a report will be late or needs an additional day or so to complete the report, the situation should be discussed with the appropriate NRC regional office. See Section 2.5 for further discussion of discovery date.
LER Forwarding Letter and Cancellations
The cover letter forwarding an LER to the NRC should be signed by a responsible official. There is no prescribed format for the letter. The date the letter is issued and the report date should be the same. Licensees are encouraged to include the NRC resident inspector and the Institute of Nuclear Power Operations (INPO) in their distribution. Multiple LERs can be forwarded by one forwarding letter. Cancellations of LERs submitted should be made by letter. The letter should state that the LER is being canceled (i.e., formally withdrawn). The bases for the cancellation should be explained so that the staff can understand and review the reasons supporting the determination. The notice of cancellation will be filed and stored with the LER and acknowledgement made in various automated data systems. The LER will be removed from the LER data base.
Voluntary LERs
Indicate information-type LERS (i.e., Voluntary LERs) by checking the "Other" block in Item 11 of the LER form and type "Voluntary Report" in the space immediately below the block. Also give a sequential LER number to the voluntary report as noted in Section 5.2.4(5). Because not all requirements of 50.73(b), "Contents," may pertain to some voluntary reports, licensees should develop the content of such reports to best present the information associated with the situation being reported. See Section 2.7 for additional discussion of Voluntary LERs.
How To Find LERs
- NRC Website search - Good for industry searching of LERs
See also
- NRC Form 366, Licensee Event Report - the NRC form
- NUREG-1022, Event Reporting Guidelines for 10 CFR 50.72 and 10 CFR 50.73
LER list
by site
1 year