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ENS 55526
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Category
ENS Notification  and Power Reactor
CFR
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation +, 10 CFR 50.72(b)(3)(iv)(A), System Actuation +, 10 CFR 50.72#b2ivB +  and 10 CFR 50.72#b3ivA +
Current power
0  +
Current reactor mode
Hot Standby +
Description
On October 15, 2021, at 1749 PDT with Diab … On October 15, 2021, at 1749 PDT with Diablo Canyon Power Plant Unit 2 operating at approximately 90 percent power, the reactor was manually tripped in accordance with plant procedures due to increasing water level in feedwater heater 2-5B. The reactor trip was uncomplicated and the Auxiliary Feedwater system started as expected. The plant is stable in Mode 3. </br>This notification is being made in accordance the requirements of 10 CFR 50.72(b)(2)(iv)(B) as a manual actuation of the reactor protection system and 10 CFR 50.72(b)(3)(iv)(A) as an automatic actuation of a specified safety system. </br>The cause of the increased feedwater level is under investigation. There was no impact to the health and safety of the public or plant personnel. </br>The Resident Inspector has been notified. The Resident Inspector has been notified.  +
Discovered date
00:49:00, 16 October 2021  +
ENS id number
55,526  +
Emergency class
Non Emergency +
Entered date
23:28:00, 15 October 2021  +
Equipment trip
Reactor Trip +
Event date
00:49:00, 16 October 2021  +
Event description
On October 15, 2021, at 1749 PDT with Diab … On October 15, 2021, at 1749 PDT with Diablo Canyon Power Plant Unit 2 operating at approximately 90 percent power, the reactor was manually tripped in accordance with plant procedures due to increasing water level in feedwater heater 2-5B. The reactor trip was uncomplicated and the Auxiliary Feedwater system started as expected. The plant is stable in Mode 3. </br>This notification is being made in accordance the requirements of 10 CFR 50.72(b)(2)(iv)(B) as a manual actuation of the reactor protection system and 10 CFR 50.72(b)(3)(iv)(A) as an automatic actuation of a specified safety system. </br>The cause of the increased feedwater level is under investigation. There was no impact to the health and safety of the public or plant personnel. </br>The Resident Inspector has been notified. The Resident Inspector has been notified.  +
Has query"Has query" is a predefined property that represents meta information (in form of a <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Subobject">subobject</a>) about individual queries and is provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
ENS 55526 +, ENS 55526 +, ENS 55526 +, ENS 55526 +, ENS 55526 +, ENS 55526 +, ENS 55526 +, ENS 55526 +, ENS 55526 +, ENS 55526 +, ENS 55526 +, ENS 55526 +, ENS 55526 +  and ENS 55526 +
Initial power
90  +
Initial reactor mode
Power Operation +
LER
05000323/LER-2021-002, Manual Reactor Trip Due to Increased Water Level in a Feedwater Heater +  and Manual Reactor Trip Due to Increased Water Level in a Feedwater Heater +
Last update date
00:00:00, 15 October 2021  +
Modification date"Modification date" is a predefined property that corresponds to the date of the last modification of a subject and is provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
20:03:57, 4 January 2024  +
NRC officer
Kerby Scales +
Notification date
23:28:00, 15 October 2021  +
Originated by
Meagan Nolan +
Reactor critical
true  +
Reactor scram
true  +
Reactor type
Westinghouse PWR 4-Loop +
Region
NRC Region 4 +
Reporting criterion
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation +  and 10 CFR 50.72(b)(3)(iv)(A), System Actuation +
Reporting time
-0.0563 d (-1.35 hours, -0.00804 weeks, -0.00185 months)  +
Scram
Manual Scram +
Site
Diablo Canyon +
Start date
00:49:00, 16 October 2021  +
State
California +
System
Feedwater +, Reactor Protection System +  and Auxiliary Feedwater +
Title
Manual Reactor Trip and Automatic Auxiliary Feedwater Actuation  +
Topic
Feedwater Heater +
URL"URL" is a <a href="/Special:Types/URL" title="Special:Types/URL">type</a> and predefined property provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a> to represent URI/URL values.
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2021/20211018en.html#en55526  +
Unit
2  +
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