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ENS 52960
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Category
ENS Notification  and Power Reactor
CFR
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation +  and 10 CFR 50.72(b)(3)(iv)(A), System Actuation +
Current power
0  +
Current reactor mode
Hot Standby +
Description
On 09/10/17 at 1855 (EDT), (Turkey Point) … On 09/10/17 at 1855 (EDT), (Turkey Point) Unit 4 reactor was manually tripped from 88% RTP (Rated Thermal Power) due to a failure of 4C Steam Generator main feed regulating valve causing lowering S/G (Steam Generator) level. All other systems operated normally. Auxiliary Feed Water initiated as designed to provide S/G water level control. EOP's (Emergency Operating Procedures) have been exited and General Operating procedures (GOP'S) were entered. Unit 4 is stable in Mode 3 at NOT/NOP (Normal Operating Temperature/Normal Operating Pressure).</br>The licensee is investigating the failure of the feed regulating valve. Offsite power is available. Decay heat is being removed via main feedwater with steam discharged to atmosphere using the ADVs (Atmospheric Dump Valves). There is no known primary-secondary steam generator tube leakage.</br>The licensee informed the NRC Resident Inspector.ensee informed the NRC Resident Inspector.  +
Discovered date
22:55:00, 10 September 2017  +
ENS id number
52,960  +
Emergency class
Non Emergency +
Entered date
22:20:00, 10 September 2017  +
Event date
22:55:00, 10 September 2017  +
Event description
On 09/10/17 at 1855 (EDT), (Turkey Point) … On 09/10/17 at 1855 (EDT), (Turkey Point) Unit 4 reactor was manually tripped from 88% RTP (Rated Thermal Power) due to a failure of 4C Steam Generator main feed regulating valve causing lowering S/G (Steam Generator) level. All other systems operated normally. Auxiliary Feed Water initiated as designed to provide S/G water level control. EOP's (Emergency Operating Procedures) have been exited and General Operating procedures (GOP'S) were entered. Unit 4 is stable in Mode 3 at NOT/NOP (Normal Operating Temperature/Normal Operating Pressure).</br>The licensee is investigating the failure of the feed regulating valve. Offsite power is available. Decay heat is being removed via main feedwater with steam discharged to atmosphere using the ADVs (Atmospheric Dump Valves). There is no known primary-secondary steam generator tube leakage.</br>The licensee informed the NRC Resident Inspector.ensee informed the NRC Resident Inspector.  +
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ENS 52960 +, ENS 52960 +, ENS 52960 +, ENS 52960 +, ENS 52960 +, ENS 52960 +, ENS 52960 +, ENS 52960 +, ENS 52960 +, ENS 52960 +, ENS 52960 +, ENS 52960 +, ENS 52960 +  and ENS 52960 +
Initial power
88  +
Initial reactor mode
Power Operation +
LER
05000251/LER-1917-001, Regarding Manual Reactor Trip Due to Lowering Steam Generator Level Caused by Loss of Flow Regulating Valve Positioner Control +  and Regarding Manual Reactor Trip Due to Lowering Steam Generator Level Caused by Loss of Flow Regulating Valve Positioner Control +
Last update date
00:00:00, 10 September 2017  +
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>.
01:42:00, 2 March 2018  +
NRC officer
Steve Sandin +
Notification date
22:20:00, 10 September 2017  +
Originated by
Tim Jones +
Procedure
Emergency Operating Procedure +
Reactor critical
true  +
Reactor scram
true  +
Reactor type
Westinghouse PWR 3-Loop +
Region
NRC Region 2 +
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
-0.0242 d (-0.58 hours, -0.00345 weeks, -7.94484e-4 months)  +
Scram
Manual Scram +
Site
Turkey Point +
Start date
22:55:00, 10 September 2017  +
State
Florida +
System
Steam Generator +, Feedwater +  and Auxiliary Feed Water +
Title
Manual Reactor Trip on Lowering Steam Generator Water Level  +
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.
http://www.nrc.gov/reading-rm/doc-collections/event-status/event/2017/20170911en.html#en52960  +
Unit
4  +
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