SECTION 4: RISK ASSESSMENT
Emergency Declaration
Date
Description
Unusual Event 11/29/1986 Unusual Event 11/30/1986 Unusual Event 12/03/1986
Loss of ERFIS computer system to display SPDS (58 lapsed minutes). Loss of ERFIS computer system to display SPDS (48 lapsed minutes). Loss of ERFIS computer system to display SPDS (27 lapsed minutes). Safety Injection (an Emergency Core Cooling System) actuated while testing electronic circuitry. Loss of ERFIS computer system to display SPDS (23 lapsed minutes). Loss of ERFIS computer system to display SPDS (22 lapsed minutes). Loss of ERFIS computer system to display SPDS (32 lapsed minutes). Loss of ERFIS computer system to display SPDS (28 lapsed minute). Fire within the Protected Area greater than 10 minutes; smoke observed coming from the motor for the reactor auxiliary building supply fan. RCS leakage in excess of Tech Specs (unidentified leakage > 1.0 gpm). RCS leakage in excess of Tech Specs; pressure operated relief valve opened and admitted RCS inventory to the pressurized relief tank (PRT). Loss of ERFIS computer system to display SPDS for > 60 minutes. Reactor coolant system (RCS) leakage in excess of Tech Specs (unidentified leakage > 1.0 gpm). High level alarm on radiological effluent release monitor the (Treated Laundry and Hot Shower high level alarm was set just above background). Loss of ERFIS computer system to display SPDS for > 60 minutes. Plant shutdown required by Technical Specifications. Excessive leakage of a containment penetration; leakage discovered during surveillance testing. Loss of ERFIS computer system to display SPDS for > 4 hours. Plant shutdown required by Technical Specifications (testing of “A” Reactor Coolant Pump (RCP) electrical protection function).
Unusual Event 12/11/1986
Unusual Event 01/27/1987 Unusual Event 07/11/1987 Unusual Event 07/24/1987 Unusual Event 07/25/1987
Unusual Event 02/04/1988
Unusual Event 10/06/1988
Unusual Event 10/20/1988
Unusual Event 11/17/1988
Unusual Event 12/01/1988
Unusual Event 12/16/1988
Unusual Event 03/13/1989
Unusual Event 01/24/1991
Unusual Event 02/15/1991
Unusual Event 03/05/1991
Unusual Event 04/14/1992 Loss of ERFIS computer system to display SPDS for > 4 hours. Unusual Event 02/06/1993 Loss of ERFIS computer system to display SPDS for > 4 hours. Unusual Event 02/17/1994 Loss of ERFIS computer system to display SPDS for > 4 hours.
Loss of both emergency diesel generators - “B” diesel generator was being worked on; in accordance with test procedures, “A” diesel generator is required to be tested within 24 hours following having redundant diesel out-of-service; did not pass test. Unplanned emergency core cooling system (ECCS) discharge to the reactor vessel; reactor trip and safety injection (SI) occurred during the performance of testing. Train derailment on site - while removing empty cask car from the Protected Area, the rail cars were moved onto the Engine Spur to allow passage of the CSX engine on adjacent Plant Spur; cask car shifted; 4 wheels of the car left the rails. Security Event - while working Work Request and Authorization (WR&A), I&C Tech investigation found cut wire in a Turbine Building radiation monitor. Later determined to not be vandalism (i.e., not a security threat).
Unusual Event 07/22/1994
Unusual Event 11/05/1995
Unusual Event 12/14/1995
Unusual Event 01/22/1997
Wake County, NC Multi-Jurisdictional Hazard Mitigation Plan
WSP June 2024 Page 261
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