ENS 52747
ENS Event | |
|---|---|
06:16 Mar 20, 2017 | |
| Title | 60-Day Optional Telephone Notification for an Invalid High Pressure Coolant Injection System Actuation |
| Event Description | Pursuant to 50.73(a)(1) the following information is provided as a sixty (60) day telephone notification to the NRC. This notification, reported under 50.73(a)(2)(iv), is being provided in lieu of the submittal of a written LER to report a condition that resulted in an invalid actuation of the high pressure coolant injection (HPCI). At Nine Mile Point Unit 1, HPCI is a flow control mode of the normal feedwater system and is not an emergency core cooling system.
On March 20, 2017 at 0216 EDT, Nine Mile Point Unit 1 reactor shutdown was in progress. The Unit 1 generator was off line, the 100 percent capacity 13 feedwater pump (13 FW) was removed from service, and the Unit 1 main turbine had been tripped appropriately per procedure while entering a planned refueling outage. At approximately 4 percent reactor power, a clearance tagging evolution was in progress to support shutdown activities. During this evolution a tag was applied that caused an unanticipated activation of a lock out (86) relay due to the failure to bypass this relay prior to the tag application. This 86 relay activation in turn resulted in a generator trip signal followed by a turbine trip signal. With the generator off line and the turbine already tripped there was no actual change in any plant parameter or condition that would have created a valid turbine trip signal and the associated HPCI initiation. The plant configuration at the time of the main turbine trip signal had one motor operated feedwater pump, 12 Feedwater Pump (12 FW), in service and providing normal reactor level control. HPCI did initiate as designed upon receiving the generator and main turbine trip signals caused by the activation of the 86 relay. The 12 FW pump, which was providing normal reactor level control, transitioned the level control from automatic mode into HPCI mode of operation. Per design, the 11 FW pump automatically started but was not required to and did not flow water since 12 FW pump was in operation. The 11 FW pump was subsequently secured by operations. At no point in time did the HPCI system receive a valid initiation signal (due to high DW pressure, low reactor water level, or a valid turbine trip with loss of the turbine driven 13 FW pump). Operators reset HPCI and returned water level to Automatic Control at 0218. The Licensee has notified the NRC Resident Inspector. |
| Where | |
|---|---|
Nine Mile Point  New York (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
| Time - Person (Reporting Time:+1255.08 h52.295 days <br />7.471 weeks <br />1.719 months <br />) | |
| Opened: | Thomas Cooper 13:21 May 11, 2017 |
| NRC Officer: | Donald Norwood |
| Last Updated: | May 11, 2017 |
| 52747 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (4 %) |
| After | Power Operation (4 %) |
WEEKMONTHYEARENS 535842018-03-19T04:00:00019 March 2018 04:00:00
[Table view]10 CFR 50.73(a)(1), Submit an LER Invalid Specified System Actuation ENS 527472017-03-20T06:16:00020 March 2017 06:16:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Telephone Notification for an Invalid High Pressure Coolant Injection System Actuation ENS 509092015-01-21T15:00:00021 January 2015 15:00:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Notification - Invalid Containment Isolation Signal ENS 490842013-04-02T13:46:0002 April 2013 13:46:00 10 CFR 50.73(a)(1), Submit an LER 6O-Day Optional Telephone Notification for an Invalid Specified System Actuation ENS 485702012-10-12T14:12:00012 October 2012 14:12:00 10 CFR 50.73(a)(1), Submit an LER Temperature Switch Failure Causes Division I Isolation Signal ENS 481132012-05-24T14:20:00024 May 2012 14:20:00 10 CFR 50.73(a)(1), Submit an LER 60 - Day Optional Telephone Notification of an Invalid Division 2 Containment Isolation Signal ENS 475472011-11-08T03:31:0008 November 2011 03:31:00 10 CFR 50.73(a)(1), Submit an LER Invalid Specified System Actuation Due to a Possible Faulty Temperature Switch ENS 457792010-03-15T16:43:00015 March 2010 16:43:00 10 CFR 50.73(a)(1), Submit an LER Inadvertent Start of Emergency Diesel Generator ENS 439232008-01-14T18:41:00014 January 2008 18:41:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Group 5 and Group 10 Primary Containment Valves During Surveillance Testing ENS 438552007-11-08T15:21:0008 November 2007 15:21:00 10 CFR 50.73(a)(1), Submit an LER Invalid Primary Containment Isolation System (Pcis) Actuation ENS 407182004-04-01T07:06:0001 April 2004 07:06:00 10 CFR 50.73(a)(1), Submit an LER Invalid Automatic Start of Emergency Diesel Generator During Surveillance Test 2018-03-19T04:00:00 | |