ENS 40737: Difference between revisions
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| event date = 05/08/2004 20:39 MST | | event date = 05/08/2004 20:39 MST | ||
| last update date = 05/09/2004 | | last update date = 05/09/2004 | ||
| title = Manual Reactor Trip During Physics Testing Due | | title = Manual Reactor Trip During Physics Testing Due to Control Element Assembly Slipping 6 Inches. | ||
| event text = On May 8, 2004, at approximately 20:39 Mountain Standard Time (MST) Palo Verde Unit 1 operations manually tripped the reactor when a Control Element Assembly (CEA) slipped approximately 6 inches (CEA # 89) while conducting physics testing (at 10E-02 percent power) following Unit 1's eleventh refueling outage. Unit 1 was at normal operating temperature and pressure prior to the trip. All CEAs inserted fully into the reactor core (Initial Conditions: Regulating groups 1, 2 & 5 were fully withdrawn, regulating group 3 was fully inserted, regulating group 4 was being inserted when CEA # 89 slipped approximately 6 inches. Shutdown groups were fully withdrawn). This was an uncomplicated reactor trip. No emergency classification was required per the Emergency Plan. No automatic ESF actuations occurred and none were required. Safety related buses remained energized during and following the reactor trip. No LCOs (Limiting Conditions of Operations) have been entered as a result of this event. No major equipment was inoperable prior to the event that contributed to the event. | | event text = On May 8, 2004, at approximately 20:39 Mountain Standard Time (MST) Palo Verde Unit 1 operations manually tripped the reactor when a Control Element Assembly (CEA) slipped approximately 6 inches (CEA # 89) while conducting physics testing (at 10E-02 percent power) following Unit 1's eleventh refueling outage. Unit 1 was at normal operating temperature and pressure prior to the trip. All CEAs inserted fully into the reactor core (Initial Conditions: Regulating groups 1, 2 & 5 were fully withdrawn, regulating group 3 was fully inserted, regulating group 4 was being inserted when CEA # 89 slipped approximately 6 inches. Shutdown groups were fully withdrawn). This was an uncomplicated reactor trip. No emergency classification was required per the Emergency Plan. No automatic ESF actuations occurred and none were required. Safety related buses remained energized during and following the reactor trip. No LCOs (Limiting Conditions of Operations) have been entered as a result of this event. No major equipment was inoperable prior to the event that contributed to the event. | ||
Unit 1 is stable at normal operating temperature and pressure in Mode 3 (Hot Standby). The event did not result in any challenges to fission product barriers and there were no adverse safety consequences as a result of this event. The event did not adversely affect the safe operation of the plant or the health and safety of the public. | Unit 1 is stable at normal operating temperature and pressure in Mode 3 (Hot Standby). The event did not result in any challenges to fission product barriers and there were no adverse safety consequences as a result of this event. The event did not adversely affect the safe operation of the plant or the health and safety of the public. | ||
Latest revision as of 21:23, 1 March 2018
| Where | |
|---|---|
Palo Verde  Arizona (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(iv)(B), RPS Actuation | |
| Time - Person (Reporting Time:+-0.72 h-0.03 days <br />-0.00429 weeks <br />-9.86256e-4 months <br />) | |
| Opened: | John Gunn 02:56 May 9, 2004 |
| NRC Officer: | John Mackinnon |
| Last Updated: | May 9, 2004 |
| 40737 - NRC Website
| |