Event Notification Report for June 25, 2019

CONTROL ROOM ENVELOPE INOPERABLE DUE TO BROAD RANGE GAS MONITORS BEING INOPERABLE

"On June 25, 2019, at 0428 CDT, the Waterford 3 shift operating crew declared the control room envelope inoperable in accordance with Technical Specification (TS) 3.7.6.1 due to both Broad Range Gas Monitors being inoperable. Operations entered TS 3.7.6.1 action b, which requires that with one or more control room emergency air filtration trains inoperable due to inoperable control room envelope boundary in Modes 1, 2, 3, or 4, then:
1. Immediately initiate action to implement mitigating actions;
2. Within 24 hours, verify mitigating actions ensure control room envelope occupant exposures to radiological, chemical, and smoke hazards will not exceed limits; and
3. Within 90 days, restore the control room envelope boundary to operable status.

"Action b.1 was completed by placing the control room in isolate mode at time 0441 CDT. This event is reportable pursuant to 10 CFR 50.72(b)(3)(v)(A) and 10 CFR 50.72(b)(3)(v)(D), event or condition that could have prevented fulfillment of a safety function of structures or systems that are needed to (A) shutdown the reactor and maintain it in shutdown condition and (D) mitigate the consequences of an accident, due to the control room envelope being inoperable.

"The NRC Senior Resident Inspector has been notified."

AGREEMENT STATE REPORT - POOL WATER CONDUCTIVITY EXCEEDS LIMIT

The following was received via e-mail:

"At approximately 1800 EDT on 6/25/2019, the conductivity of the underwater pool irradiator water rose to 308 microSiemens/cm and remained in this range throughout the night. This was in conjunction with low flow through the water circulation pump. The pump was repaired the morning of 6/26/2019 and subsequent conductivity readings have ranged from 24.3 microSiemens/cm to 13.9 microSiemens/cm. The licensee is currently on a plan of changing the deionization tanks every two days to continue cleaning the water. In addition they are working with a supplier on additional methods to clean the pool water."

New Jersey Event Report Identification No.: INV190001-507147

INVALID ENGINEERED SAFETY FEATURE ACTUATION SIGNAL DUE TO HUMAN ERROR

"This 60-day telephone notification is being made in accordance with 10 CFR 50.73(a)(1) and 10 CFR 50.73(a)(2)(iv)(A) to provide information pertaining to an invalid Engineered Safety Feature actuation signal.

"On June 25, 2019, at Waterford 3, while performing an emergent replacement of relays on the Engineered Safety Features Actuation System Train A that affected Shield Building Ventilation Train A and HVAC Equipment Room Supply Fan AH-1 3A, unintentional contact was made between two contacts on the relay, resulting in an inadvertent initiation of other relays in the sequencer circuit. This caused the starting of Low Pressure Safety Injection Pump A, Switchgear Ventilation Fan A, and Boric Acid Makeup pumps. This was a partial actuation of Engineered Safety Features Actuation System Train A. Affected plant systems started and functioned successfully.

"This inadvertent actuation was caused by human error and was not a valid signal resulting from parameter inputs. The 1992 Statements of Consideration define an invalid signal to include human error. Therefore, this actuation is considered invalid. This event was entered into the Waterford 3 corrective action program for resolution. This event did not result in any adverse impact to the health and safety of the public.

"In accordance with 10 CFR 50.73(a)(1), a telephone notification is being made in lieu of submitting a written Licensee Event Report.

"The NRC Senior Resident Inspector has been notified."