ENS Event | |
|---|---|
09:48 Nov 3, 2011 | |
| Title | Invalid Actuation of a Safety Injection Valve |
| Event Description | This telephone notification is being made in lieu of submitting a written LER under 10 CFR 50.73(a)(2)(iv)(A) for an invalid actuation of MOV 8803A, High Head Safety Injection (HHSI) to RCS Cold Leg, resulting in ECCS injection into the RCS.
On November 3, 2011 at 03:48 CST, during a maintenance replacement activity for the K604 slave relay in Solid State Protection System, MOV 8803A unexpectedly opened. The relay was not recognized to be in a latched condition when the lead associated with MOV 8803A was landed causing it to stroke open. This actuation was invalid since the stroke signal was not initiated in response to actual plant conditions or parameters satisfying the requirements for initiation of the safety function of the system. MOV 8803A was subsequently closed from the control room in approximately 2 minutes and power was removed at 03:57 CST to prevent another stroke. After investigation, the relay was installed in the correct configuration and system tested to restore operability. This event did not adversely affect the safe operation of the plant or health and safety of the public. The following required information is being submitted per NUREG-1022, Rev. 2: (a) MOV 8803A is an 'A' Train component. (b) The stroke open of MOV 8803A and ECCS injection is a partial train actuation. (c) Given the conditions, MOV 8803A functioned as expected and all other systems functioned per design. The licensee notified the NRC Resident Inspector |
| Where | |
|---|---|
Farley  Alabama (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
| Time - Person (Reporting Time:+493.28 h20.553 days <br />2.936 weeks <br />0.676 months <br />) | |
| Opened: | Alton Deweese 00:05 Nov 24, 2011 |
| NRC Officer: | Mark Abramovitz |
| Last Updated: | Nov 24, 2011 |
| 47475 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | No |
| Before | Cold Shutdown (0 %) |
| After | Cold Shutdown (0 %) |
WEEKMONTHYEARENS 574912024-12-07T03:06:0007 December 2024 03:06:00
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