05000369/LER-2005-003, Re Containment Closure Requirements Not Met During Core Alterations
| ML053410406 | |
| Person / Time | |
|---|---|
| Site: | McGuire  |
| Issue date: | 11/15/2005 |
| From: | Gordon Peterson Duke Power Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| LER 05-003-00 | |
| Download: ML053410406 (8) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications |
| 3692005003R00 - NRC Website | |
text
- Duke GARY R. PETERSON
- rPowere Vice President A Duke Energy Company McGuire Nuclear Station Duke Power MGO1 VP / 12700 Hagers Ferry Road Huntersville, NC 28078-9340 704 875 5333 704 875 4809 fax grpeters@duke-energy. corn November 15, 2005 U.S. Nuclear Regulatory Commission Washington, D.C.
20555 Attention: Document Control Desk
Subject:
McGuire Nuclear Station, Units 1 and 2 Docket No. 50-369 Licensee Event Report 369/2005-03, Revision 0 Problem Investigation Process (PIP) M-05-04128 Pursuant to 10 CFR 50.73, Sections (a)(1) and (d), attached is Licensee Event Report (LER) 369/2005-03, Revision 0.
On September 20, 2005, McGuire Nuclear Station identified a historical condition concerning refilling ice condenser baskets during core alterations on Units 1 and 2 which was prohibited by the plant's Technical Specifications.
This report is being submitted in accordance with 10 CFR 50.73 (a)(2)(i)(B). This event was determined to be of no significance to the health and safety of the public.
There are no regulatory commitments contained in the LER.
G. R. Peterson Attachment 4j, www. duke-energy. corn
U. S. Nuclear Regulatory Commission November 15, 2005 Page 2 of 2 cc:
W. D. Travers U. S. Nuclear Regulatory Commission Regional Administrator, Region II Atlanta Federal Center 61 Forsyth St., SW, Suite 23T85 Atlanta, GA 30303 R. E Martin (Addressee Only)
NRC Project Manager (McGuire)
U. S. Nuclear Regulatory Commission Mail Stop 8-G9A Washington, DC 20555-0001 J. B. Brady Senior Resident Inspector U. S. Nuclear Regulatory Commission McGuire Nuclear Site Beverly 0. Hall, Section Chief Radiation Protection Section 1645 Mail Service Center Raleigh, NC 27699-1645
Abstract
Unit Status: At the time this historical condition was identified, Unit 1 was in Mode 5 (Cold Shutdown) at 0 percent power and Unit 2 was in Mode 1 (Power Operation) at 100 percent power.
Event Description
In September 2005, the historical practice of re-filling the Ice Condenser ice baskets by blowing ice through a containment penetration during refueling outages was reviewed as a transportability corrective action from Problem Investigation Process (PIP) M-05-1608 and LER 370/2005-03.
It was concluded that this practice did not meet Technical Specification (TS) 3.9.4 LCO requirements when performed during core alterations or fuel movement and thus represented an operation prohibited by McGuire's Technical Specifications.
McGuire interprets TS 3.9.4 to only allow the Containment Purge (VP) system penetrations to provide direct access from the containment atmosphere to the outside atmosphere during core alterations or fuel movement.
This event was not significant with respect to the health and safety of the public.
Event Cause
The cause for this historical condition was the use of a non-conservative interpretation of TS 3.9.4 when the safety evaluation for this practice was originally performed.
Corrective Actions
All affected procedures were revised to prohibit opening the ice blowing containment penetration during core alterations or fuel movement.
NRC FORM 366 (6-2004)
(if more space is required, use additional copies of (If more space is required, use additional copies of (if more space is required, use additional copies of (If more space is required, use additional copies of (If more space is required, use additional copies of NRC Form 366A) has been modeled in the current analysis.
These results are below the regulatory limits and the plant did not operate outside its design or licensing basis.
Therefore, there was no impact to the health and safety of the public or plant personnel.
ADDITIONAL INFORMATION
As previously stated, a similar condition was reported by McGuire LER 370/2005-03 dated May 26, 2005 regarding a containment air release during core alterations.
This ice blowing condition was discovered as a result of corrective actions from the event reported in May 2005.
No other occurrences of containment closure issues have been identified.
Corrective Action 11 from PIP M-05-1608 documents a complete review of the Containment Closure and Integrity procedures, PT/1&2/A/4200/002C, for potential conflicts with TS 3.9.4. No other issues were identified with the exception of this ice blowing containment penetration.