Finding | |
|---|---|
| Title | Subsequent Loss of Safety-Related Chilled Water System Results in a Loss of Safety Function |
| Description | The inspectors opened a URI to facilitate prompt tracking, documentation, and closure of inspection, verification, and resolution activities, associated with the A ESCW chiller failures. On July 15, 2016, the A ESCW chiller tripped on low oil pressure. Licensee investigation identified that oil was leaking from the threaded portion of a brass fitting located between a pressure switch and needle valve associated with PDS-01CY-9428ASA-HI. Upon removal, it was observed that significant radial cracking occurred in the threaded portion of the brass fitting. A like-for-like replacement was installed and the A ESCW chiller was returned to service. One week later, on July 22, 2016, the A ESCW chiller tripped again on low oil pressure. The investigation revealed that the same brass fitting had failed and the A ESCW chiller could not meet its mission time of 30 days of continuous operation in the event of a loss of cooling accident. During this 7-day period, the B ESCW chiller was inoperable for a period of time, which means the ESCW system would not have been able to meet its safety function. The licensees investigation into the cause of the subsequent failure is ongoing. A URI is being opened to determine whether the subsequent failure of the brass fitting was reasonably within the licensees ability to predict and therefore a performance deficiency. This issue is being tracked as URI 05000400/2016003-01, Subsequent Loss of Safety-Related Chilled Water System Results in a Loss of Safety Function. |
| Site: | Harris  |
|---|---|
| Report | IR 05000400/2016003 Section 1R21 |
| Date counted | Sep 30, 2016 (2016Q3) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.21 |
| Inspectors (proximate) | D Jackson J Dodson J Zeiler K Miller M Riches S Rosea Butcavagea Sengupta C Dykes C Jones J Dodson J Rivera M Bates M Riches S Rose W Loo |
| INPO aspect | |
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Finding - Harris - IR 05000400/2016003 | ||||||||||||||||||||||||||||||||||||||||||
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Finding List (Harris) @ 2016Q3
Self-Identified List (Harris)
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