ENS Event | |
|---|---|
10:57 Apr 24, 2018 | |
| Title | Containment Radiation Monitors Inoperable |
| Event Description | At 0357 [PDT], Unit 2 Containment High Range Radiation Monitor RM-31 was declared inoperable due to erratic indication. At this time, Containment High Range Radiation Monitor RM-30 was out of service for routine calibration.
With both containment high range radiation monitors inoperable, this impacted DCPP's [Diablo Canyon Power Plant's] ability to evaluate containment radiation data for an unmonitored release in the event of an emergency. Compensatory measures were promptly put in place with the use of a portable radiation monitor as required by emergency preparedness procedures. This condition is being reported as a loss of assessment capability in accordance with 10 CFR 50.72(b)(3)(xiii). Actions are in progress to restore RM-30 and RM-31 to operable status. The NRC Senior Resident Inspector has been notified.
RM-30 was restored to service. Portable radiation monitoring is not required. The licensee will notify the NRC Resident Inspector. Notified R4DO (Vasquez). |
| Where | |
|---|---|
Diablo Canyon  California (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | |
| Time - Person (Reporting Time:+3.78 h0.158 days <br />0.0225 weeks <br />0.00518 months <br />) | |
| Opened: | Eric Thomas 14:44 Apr 24, 2018 |
| NRC Officer: | Dong Park |
| Last Updated: | Apr 24, 2018 |
| 53361 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
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 | |