Power Reactor

Event Number: 43550

Facility: SALEM
Region: 1 State: NJ
Unit: [ ] [2] [ ]
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: JOHN GARECHT
HQ OPS Officer: JEFF ROTTON

Notification Date: 08/06/2007
Notification Time: 15:21 [ET]
Event Date: 08/06/2007
Event Time: 13:10 [EDT]
Last Update Date: 08/06/2007

Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(2)( iv)(B) - RPS ACTUATION - CRITICAL
50.72(b)(3)( iv)(A) - VALID SPECIF SYS ACTUATION

Person (Organization) :
ROBERT SUMMERS (R1)

 

Unit

SCRAM Code

RX CRIT

Initial PWR

Initial RX Mode

Current PWR

Current RX Mode

2

A/R

Y

100

Power Operation

0

Hot Standby

Event Text

REACTOR TRIP DUE TO SPURIOUS INTERLOCK SIGNAL TO FEEDWATER REGULATING VALVES

"This 4-hour notification is being made to report that Salem Unit 2 has experienced an automatic reactor trip. The trip was initiated by a low steam generator level on 22 SG (14 percent narrow range). The low steam generator level was apparently caused due to the feedwater regulating valve closing as a result of a spurious 'Feedwater interlock' signal. Post trip the following occurred: 21, 22, & 23 auxiliary feedwater pumps auto started after the trip due to valid steam generator low levels (14 percent) as expected on a unit trip. 23 Auxiliary feedwater pump [turbine driven] was tripped in accordance with the emergency operating procedure and will be returned to an operable condition following recovery of steam generator levels.

"Salem Unit 2 is currently in mode 3. Reactor coolant system pressure at 2235 psig and temperature is 547 degrees F with decay heat removal via the main steam dump system. Unit 2 has no active shutdown Tech Spec Action statements in effect.

" There was no major secondary equipment tagged for maintenance prior to the event."

On the reactor trip, all control rods fully inserted. No primary or secondary relief valves or safety valves lifted. The electric plant is in a normal shutdown lineup. This event had no effect on Unit 1.

The licensee notified the NRC Resident Inspector. The licensee will notify the Lower Alloways Creek township, the State of NJ Bureau of Nuclear Engineering, and the State of Delaware. The licensee also plans on issuing a press release.