ENS 41010
ENS Event | |
|---|---|
17:50 Sep 1, 2004 | |
| Title | Heat Balance Indication Above Licensed Value |
| Event Description | This is a 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> ENS notification of a failure to comply with section 2C of the license, which authorizes operation of the facility at steady-state power levels not in excess of 1930 MWth.
Description of Event: At 13:50, upon installation of a new PC [Plant Computer] isolator Power Supply, the PCS [Plant Computer System] Heat Balance indicated 1936 MWth. Operations immediately lowered reactor power to maintain indicated power less than 1930 MWth. At 09:38 on 09/01/04, the Plant Computer System Isolator Power Supply had failed. Per procedure an admin rod block was installed and all reactivity manipulations were ceased. A prompt investigation was commenced. Initial results of the prompt investigation indicate that the PC isolator Power Supply began to degrade on 08/29. This degradation resulted in a slow lowering of indicated CRD Flow which provides input to the PCS Heat Balance calculation. Based on evaluations of the impact of the degradation, the 1930 MWth limit was exceeded on 08/30/04 at 18:41. Power peaked at 1937 MWth, to approximately 100.4%, on 09/01/04. Immediate Corrective Actions: 1- Reduced reactor power to <1930 MWth per the heat balance 2- Verified correct all computer inputs Into the PCS Heat Balance 3 - Established a PCS Point Group for Heat Balance Inputs which are being checked twice a shift. The NRC Resident Inspector has been notified by the licensee. |
| Where | |
|---|---|
| Oyster Creek New Jersey (NRC Region 1) | |
| Reporting | |
| Other Unspec Reqmnt | |
| Time - Person (Reporting Time:+18.88 h0.787 days <br />0.112 weeks <br />0.0259 months <br />) | |
| Opened: | Jeffrey P. Dostal 12:43 Sep 2, 2004 |
| NRC Officer: | Arlon Costa |
| Last Updated: | Sep 2, 2004 |
| 41010 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (99 %) |
Oyster Creek with Other Unspec Reqmnt | |
WEEKMONTHYEARENS 415032005-03-18T19:00:00018 March 2005 19:00:00
[Table view]Other Unspec Reqmnt Other Unspecified Requirement - License Condition 2.C ENS 410102004-09-01T17:50:0001 September 2004 17:50:00 Other Unspec Reqmnt Heat Balance Indication Above Licensed Value ENS 407482004-05-14T12:13:00014 May 2004 12:13:00 Other Unspec Reqmnt Change in the Methodology Used by Ge/Gnf to Demonstrate Compliance with Eccs Performance Requirements 2005-03-18T19:00:00 | |