LER: 05000390, 391/2017-013-00, Incorrectly Adjusted
Auxiliary Building Gas Treatment System Damper Leads to a Condition Prohibited by Technical Specifications, November 6, 2017. Violation: Watts Bar Unit 1
TS 3.7.12,
Auxiliary Building Gas Treatment System (
ABGTS), Condition A, requires that an
inoperable ABGTS train to be restored to
operable status within 7 days. Condition B of
TS 3.7.12 requires the plant to be in Mode 3 within
6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and Mode 5 within
36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br /> if one train of
ABGTS is
inoperable longer than 7 days. Contrary to the requirements of
TS 3.7.12,
ABGTS, train A was determined to be
inoperable from July 7, 2017, at 2030 Eastern Daylight Time (EDT) to September 5, 2017, at 1645 EDT while the plant remained in Mode 1. Significance/Severity Level: This violation was characterized using traditional enforcement because the NRC determined that this violation was not reasonably foreseeable and preventable by the licensee and, therefore, is not a performance deficiency. The violation was assessed using Sections 2.2.4 and 6.1.d.1 of the NRCs
Enforcement Policy and determined to be a
SL IV violation. Corrective Action Reference(s): Condition Report (CR) 1335791
