ENS 47517
ENS Event | |
|---|---|
17:58 Dec 11, 2011 | |
| Title | Intermediate Range Nuclear Instrument High Flux Trip Set Points Set Incorrectly |
| Event Description | This 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> notification is being made in accordance with 10 CFR50.72 (b)(3)(v)(A).
On November 24, 2011, 1N35 and 1N36 Intermediate Range Nuclear Instruments High Flux Trip set points were adjusted while Unit 1 was at approximately 55% reactor power following the 1R21 Refueling outage, On December 11, 2011, at 1258 EST Salem Unit 1 entered Technical Specification 3.0.3, after determining the set points were set incorrectly. A review of the Reactor Engineering Manual, which contains the trip set points, showed that the trip set points for 1N35 and 1N36 were 2.69E-4 and 2.37E-4 respectively. These values equate to approximately 125% thermal power. The Intermediate Range Trip set point is normally set to 25% thermal power. Both channels were declared inoperable and preparations were made to install the correct set points. At 1628 [EST] 1N35 was declared operable and Technical Specification 3.0.3 was exited following installation of the correct set point and retest of the channel. There was no out-of-service safety related equipment that contributed to this event. No one was injured as a result of this event. The licensee will notify the NRC Resident Inspector and local authorities. |
| Where | |
|---|---|
Salem  New Jersey (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor | |
| Time - Person (Reporting Time:+-1.22 h-0.0508 days <br />-0.00726 weeks <br />-0.00167 months <br />) | |
| Opened: | Thomas Byykkonen 16:45 Dec 11, 2011 |
| NRC Officer: | John Knoke |
| Last Updated: | Dec 11, 2011 |
| 47517 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |