At 0645 EDT on the morning of April 1, 2014, with James A. FitzPatrick Nuclear Power Plant (JAF) operating at 100 percent power, the Control Room received an alarm associated with the ventilation system for the 'B' division of the
Residual Heat Removal Service Water (
RHRSW) and Emergency
Service Water (
ESW) pump room. Investigation identified that the ventilation exhaust fan (
73FN-3B) associated with this pump room had tripped due to thermal overload. The
overload relay was reset at 0704 EDT and the fan automatically started; the fan is currently operable. During this period, the fan would not have automatically started.
The ventilation systems for the RHRSW and ESW pump rooms are not included in the JAF Technical Specifications (TS), nor are they in the JAF Technical Requirements Manual (TRM). The ambient temperature limit in the RHRSW and ESW pump room was never challenged. However, with 73FN-3B non-functional, it is procedurally required to declare 10P-1B (RHRSW Pump B), 10P-1D (RHRSW Pump D) and 46P-2B (ESW Pump B) inoperable. The 'B' ESW pump cools the 'B' EDG subsystem, which would therefore also be inoperable. During this period, the 'A' EDG subsystem was inoperable for an emergent issue. Because the 'A' and 'B' EDG subsystems were concurrently inoperable for a period of approximately 45 minutes, this condition resulted in a loss of safety function for the Emergency Diesel Generators, which is reportable pursuant to 10 CFR 50.72(b)(3)(v)(A).
Both affected emergency diesel generators were in the same division with another redundant division operable.
The licensee notified the NRC Resident Inspector and will be notifying the State of New York.
- * * UPDATE AT 1200 EDT ON 4/2/14 FROM CHRIS ADNER TO S. SANDIN * * *
The statement "Both affected emergency diesel generators were in the same division with another redundant division operable" is incorrect. Both divisions of emergency diesel generators were inoperable, since one of two available emergency diesel generators per division were inoperable at the time of this event.
The Licensee notified the NRC Resident Inspector.
Notified R1DO (Cahill).
