05000244/FIN-2009005-03
From kanterella
Jump to navigation
Jump to search
Finding | |
|---|---|
| Title | Inadequate Selection of Alternating Current-Powered Relays in Control Room Emergency Air Treatment System Fan Control Logic |
| Description | A self-revealing NCV of 10 CFR 50, Appendix B, Criterion III, Design Control, was identified for Ginna\'s failure to select a suitable relay in the design of control room emergency air treatment system (CREATS) actuation and sequencing logic which led to the inoperability of both trains of GREATS fans. On September 16, 2009, while operating in Mode 5, Ginna completed emergency diesel generator load and safeguard sequence testing. This testing included placing the GREATS in service followed by initiation of a simulated safety injection (SI) signal concurrent with a loss of offsite power (LOOP) condition. Both trains of CREATS fan breaker stripped and did not sequence on as required. The GREATS fan breakers tripped on over-current due to a design deficiency that incorrectly utilized both alternating current (AG)-powered relays and direct current (DC)-powered relays in the CREATS Sl and LOOP actuation logic circuitry. Ginna\'s corrective actions included changing the AG-powered relays to DC-powered relays to eliminate the design deficiency. This finding is more than minor because it affected the design control attribute of the Barrier Integrity Cornerstone objective of maintaining radiological barrier functionality in the control room. The inspectors determined that the finding was of very low safety significance (Green) using IMC 0609, Appendix A, Determining the Significance of Reactor Inspection Findings for At-Power Situations. Specifically, the finding only represented a degradation of the radiological barrier function provided for the control room. Since the CREATS was designed and implemented in 2004, this finding does not reflect current licensee performance and there is no cross-cutting aspect |
| Site: | Ginna  |
|---|---|
| Report | IR 05000244/2009005 Section 1R22 |
| Date counted | Dec 31, 2009 (2009Q4) |
| Type: | NCV: Green |
| cornerstone | Barrier Integrity |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71111.22 |
| Inspectors (proximate) | K Kolaczyk G Dentel L Casey P Mckenna |
| INPO aspect | |
| ' | |
Finding - Ginna - IR 05000244/2009005 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Finding List (Ginna) @ 2009Q4
Self-Identified List (Ginna)
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||