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ENS 40719
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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 +  and 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown +
Current power
0  +
Current reactor mode
Hot Shutdown +
Description
Operators inserted a manual scram at 0217 … Operators inserted a manual scram at 0217 (EDT) in anticipation of torus bulk temperature approaching 110 degrees F following an Electromatic Relief Valve (ERV) failing to close during ERV testing. Technical Specification 3.3.2.e requires the insertion of a manual scram prior to torus bulk temperature reaching 110 degrees F. The maximum average torus temperature was 104 degrees F.</br>Operators opened ERV 123 at 0209 for post maintenance testing from approximately 19% power. The ERV subsequently stuck open. Operators performed the off-normal procedure for a stuck open ERV, but this failed to shut the valve. This ported steam from the reactor vessel to the torus resulting in an uncontrolled torus temperature rise. Operators placed torus cooling in service but this did not stop the rising torus temperature. Following the manual scram, cooldown, and depressurization, shutdown cooling is being placed in service. </br>Immediately following the manual scram, a turbine trip signal actuated the logic for high pressure coolant injection. High pressure coolant injection actuated and operators controlled level above 53 inches.</br>With the ERV stuck open, the cooldown rate could not be controlled. The cooldown rate was approximately 190 degrees F during the first hour following the scram.</br>All control rods fully inserted into the core. Decay heat is being removed by shutdown cooling (in service at the time of the report). The operators intend to cooldown to cold shutdown. The electrical buses are stable. Nine Mile Point Unit 2 was not affected.</br>The licensee notified the NRC Resident Inspector.ensee notified the NRC Resident Inspector.  +
Discovered date
06:17:00, 2 May 2004  +
ENS id number
40,719  +
Emergency class
Non Emergency +
Entered date
04:09:00, 2 May 2004  +
Equipment trip
Turbine Trip +
Event date
06:17:00, 2 May 2004  +
Event description
Operators inserted a manual scram at 0217 … Operators inserted a manual scram at 0217 (EDT) in anticipation of torus bulk temperature approaching 110 degrees F following an Electromatic Relief Valve (ERV) failing to close during ERV testing. Technical Specification 3.3.2.e requires the insertion of a manual scram prior to torus bulk temperature reaching 110 degrees F. The maximum average torus temperature was 104 degrees F.</br>Operators opened ERV 123 at 0209 for post maintenance testing from approximately 19% power. The ERV subsequently stuck open. Operators performed the off-normal procedure for a stuck open ERV, but this failed to shut the valve. This ported steam from the reactor vessel to the torus resulting in an uncontrolled torus temperature rise. Operators placed torus cooling in service but this did not stop the rising torus temperature. Following the manual scram, cooldown, and depressurization, shutdown cooling is being placed in service. </br>Immediately following the manual scram, a turbine trip signal actuated the logic for high pressure coolant injection. High pressure coolant injection actuated and operators controlled level above 53 inches.</br>With the ERV stuck open, the cooldown rate could not be controlled. The cooldown rate was approximately 190 degrees F during the first hour following the scram.</br>All control rods fully inserted into the core. Decay heat is being removed by shutdown cooling (in service at the time of the report). The operators intend to cooldown to cold shutdown. The electrical buses are stable. Nine Mile Point Unit 2 was not affected.</br>The licensee notified the NRC Resident Inspector.ensee notified the NRC Resident Inspector.  +
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ENS 40719 +, ENS 40719 +, ENS 40719 +, ENS 40719 +, ENS 40719 +, ENS 40719 +, ENS 40719 +, ENS 40719 +, ENS 40719 +, ENS 40719 +, ENS 40719 +, ENS 40719 +, ENS 40719 +, ENS 40719 +, ENS 40719 +  and ENS 40719 +
Initial power
19  +
Initial reactor mode
Power Operation +
Last update date
00:00:00, 2 May 2004  +
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>.
02:23:38, 2 March 2018  +
NRC officer
Bill Gott +
Notification date
04:09:00, 2 May 2004  +
Originated by
Fred Ringwald +
Reactor critical
true  +
Reactor scram
true  +
Reactor type
GE-2 +
Region
NRC Region 1 +
Reporting criterion
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation +, 10 CFR 50.72(b)(3)(iv)(A), System Actuation +  and 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown +
Reporting time
-0.0888 d (-2.13 hours, -0.0127 weeks, -0.00292 months)  +
Scram
Manual Scram +
Site
Nine Mile Point +
Start date
06:17:00, 2 May 2004  +
State
New York +
System
High Pressure Coolant Injection +, Shutdown Cooling +  and Control Rod +
TS
TS-3.3.2.e +
Title
Manual Scram Due to Rising Torus Temperature Due to Stuck Open Erv  +
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/2004/20040503en.html#en40719  +
Unit
1  +
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