ENS 48600
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ENS Event | |
|---|---|
02:04 Dec 18, 2012 | |
| Title | Plant Vent Continuous Radiation Monitors Inoperable |
| Event Description | This is a non-emergency notification. At 1804 PST on December 17, 2012, Diablo Canyon Unit 1 experienced a loss of plant vent continuous radiation monitors (RM) and redundant monitors 14/14R, 24/24R, 28/28R and 87. These radiation monitors are credited for Emergency Action Level (EAL) classification in the Diablo Canyon Emergency Plan. This event is reportable per 10 CFR 50.72(b)(3)(xiii) as described in NUREG-1022, Rev. 2. Compensatory measures of periodic sampling have been established in accordance with plant equipment control guidelines. Event classification can be performed by means of the sampling in accordance with plant procedures. Additionally, continuous radiation monitoring of the plant vent remains via high range radiation monitor RM-29.
The cause of the loss of radiation monitors is not known at this time. This condition does not affect the health and safety of the public or the operation of the facility. The NRC Resident Inspector was informed.
The licensee determined that the flow element on the sampling pump for the radiation monitors had failed. At 0630 EST, the condition was repaired and the radiation monitors returned to service. R4DO (Whitten) notified. |
| Where | |
|---|---|
Diablo Canyon  California (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | |
| Time - Person (Reporting Time:+0.05 h0.00208 days <br />2.97619e-4 weeks <br />6.849e-5 months <br />) | |
| Opened: | Dave Gouveia 02:07 Dec 18, 2012 |
| NRC Officer: | Bill Huffman |
| Last Updated: | Dec 18, 2012 |
| 48600 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (54 %) |
| After | Power Operation (54 %) |
WEEKMONTHYEARENS 533612018-04-24T10:57:00024 April 2018 10:57:00
[Table view]10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Containment Radiation Monitors Inoperable ENS 493342013-09-09T20:00:0009 September 2013 20:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Planned Partial Loss of Communications Capability in Technical Support Center ENS 491732013-07-03T07:00:0003 July 2013 07:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Emergency Response Communications Due to a Loss of Ancillary Power ENS 487862013-02-27T00:30:00027 February 2013 00:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Assessment Capability Due to Vital Inverter Maintenance ENS 486002012-12-18T02:04:00018 December 2012 02:04:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Plant Vent Continuous Radiation Monitors Inoperable ENS 483392012-09-25T12:55:00025 September 2012 12:55:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Removed from Service for Maintenance ENS 481712012-08-09T17:00:0009 August 2012 17:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Emergency Operations Facility Data Network Maintenance ENS 443052008-06-19T03:15:00019 June 2008 03:15:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Meteorlogical Mixing Calculations Unavailable ENS 426402006-06-14T16:41:00014 June 2006 16:41:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Erds Inoperable ENS 413022004-12-31T11:15:00031 December 2004 11:15:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Emergency Notification Sirens 2018-04-24T10:57:00 | |
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