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| Entered date | Event description | |
|---|---|---|
| ENS 41533 | 28 March 2005 14:21:00 | The licensee faxed the following information: On Tuesday, March 29, 2005, Surry Power Station will remove a portion of the Emergency Response Facilities Computer System (ERFCS) in the Main Control Room (MCR) for planned upgrades to a new system for increased reliability and improved human interface design. For approximately 1 week, there will not be a qualified Safety Parameter Display System (SPDS) available in the MCR. During the time period that SPDS is unavailable in the MCR while the upgrade is occurring, the replacement SPDS system is available in the MCR on the Plant Computer System (PCS), but final testing will not qualify the software until completion of this work. There will also remain one ERFCS terminal operable in both the Technical Support Center (TSC) and Local Emergency Operations Facility (LEOF) with operable SPDS throughout the duration of this work. The Emergency Response Data System (ERDS) will remain available from those terminals for the duration of this planned work and normal data transmission capability will remain in the event of an emergency. Since SPDS will be out of service for greater than 1 hour, this report is being submitted in accordance with the guidance in 10CFR50.72(b)(3)(xiii) and NUREG-1022. The licensee has notified the NRC Resident Inspector.
The following information was provided by the licensee via facsimile: This report is an update to previous report EN #41533, dated 03/28/05, regarding the availability of the Emergency Response Facilities Computer System (ERFCS) and Safety Parameter Display System (SPDS) in the main control room for Surry Power Station. The ERFCS and SPDS modifications and testing were completed at 1630 hours on 04/07/05. These functions have been transferred to the Surry Plant Computer System. Senior NRC resident, Norm Garrett was notified via alphanumeric page. Notification was made to NRC duty officer Bill Huffman. R2DO (Rogers) notified. |
| ENS 40771 | 22 May 2004 22:29:00 | There is sufficient reason to believe that the buried auxiliary feedwater piping associated with Unit 2 is degraded and leaking and thus as a conservative measure it is declared inoperable. This operability determination is based on not having a reasonable assurance that the auxiliary feedwater piping can continue to perform its intended function under all design basis events including seismic events. Approximate leakrate is 8 gpm. Makeup is sufficient at this time to maintain desired level in the affected tank. Further efforts to determine the exact leak location are ongoing. This notification is being made pursuant to 10 CFR 50.72(b)(3)(v)(D) for the 8-hour notification of a condition that could have prevented the fulfillment of the safety function of systems or structures that are needed to mitigate the consequences of an accident. Emergency Condensate Storage Tank level was decreasing and water has been detected coming from a conduit in the Safeguard Building. Licensee is in Tech Spec 3.0.1 (30 hours to get below 350 degrees F and 450 psig). The NRC Resident Inspector was notified of this event by the licensee. See EN #'s 40770, 40769 & 40768 for Surry Unit 2 related problems. |
| ENS 40292 | 3 November 2003 17:36:00 | The design data used to support Dominion's methodology to cope with a loss of (RCP) seal cooling (which was based on Westinghouse WCAP-10541 Rev. 2) may be non-conservative. The NRC issued an SER on Westinghouse report WCAP-15603 that indicates data from this new model must consider a 20% probability that the hot RCP seals may result in up to 182 gpm leakage per pump if seal cooling is lost for more than 13 minutes. Assuming this higher leak rate, the requirements of Appendix R, Section III.L, cannot be met since Pressurizer level could not be maintained. Current methodology indicates Surry will lose charging and seal cooling for greater than 13 minutes from a fire in the Emergency Switchgear Room. This report is being made pursuant to 10 CFR 50.72 (b)(3)(ii)(B). The NRC resident (inspector) was notified of this condition. |