ML061650156
| ML061650156 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 06/13/2006 |
| From: | Cowan B AmerGen Energy Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| 2130-06-20348 | |
| Download: ML061650156 (3) | |
Text
2 1 30-06-20348 June 13,2006 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001 Oyster Creek Generating Station Facility Operating License No. DPR-16 NRC Docket No. 50-219
Subject:
Response to NRC Request to Revise Calculation C-l302-215-E320-063 for the Reactor Water Clean-up High Energy Line Break Detection and Isolation and Instrumentation Setpoint
References:
- 1)
AmerGen letter 21 30-05-20029 dated February 2, 2005, Technical Specification Change Request No. 280 - Reactor Water Clean-up High Energy Line Break Detection and Isolation.
- 2)
USNRC email dated October 18, 2005, Request for Additional Information (RAI) on Oyster Creek Generating Station Technical Specification Change Request - Reactor Water Clean-up High Energy Line Break Detection and Isolation (TAC No. MC6046).
- 3)
AmerGen letter 21 30-06-20283 dated April 19, 2006, Response to Request for Additional Information Concerning Technical Specification Change Request on Reactor Water Clean-up High Energy Line Break Detection and Isolation This letter provides additional information as requested by the NRC staff during a telephone conference on May 31, 2006. The request for information is in regard to AmerGen Energy Companys Technical Specification Change Request (TSCR) No. 280 (Reference 1) to include the setpoint for the Reactor Water Clean-up High Energy Line Break detection and isolation instrumentation in the Technical Specifications.
In Reference 2, the NRC staff requested additional information related to the methodology used at Oyster Creek in establishing the setpoint for the Reactor Water Clean-up High Energy Line Break instrumentation. AmerGen provided the response to
U. S. Nuclear Regulatory Commission June 13,2006 Page 2 the request for additional information in Reference 3. After reviewing AmerGens response, the NRC requested a telephone conference to discuss C-l302-215-E320-063, RWCU HELB High Temperature Setpoint Error Calculation, that established the values for the as found, as left and nominal trip set points for the RWCU HELB instrumentation temperature switches. The telephone conference was conducted on May 31, 2006 between AmerGen (D. Robillard, et al) and the NRC (G. E. Miller, et al) to discuss the calculation. During the conference, the NRC expressed concern regarding the calculation methodology, specifically, the establishment of the as found upper limit in section 7.6 of the calculation. The NRC concern was focused on the fact that the calculation included the as left tolerance twice in the determination of the upper as found limit. Inclusion of the as left tolerance twice provides for a band of 12 degrees F, between the nominal trip set point and the upper as found limit. The NRC is concerned that the band of 12 degrees would mask potentially degrading instrument performance, and requested that AmerGen revise the calculation to only include the as left tolerance once in the calculation of the upper as found limit. AmerGen concurs with this request and will revise the calculation accordingly. AmerGen anticipates that this change will reduce the as-found band to approximately 8 degrees F. The calculation will be revised, prior to implementation of the approved license amendment. Enclosure 1 provides a summary of the regulatory commitments made in this submittal. No changes to the original license amendment request are required due to submittal of these responses to the NRC RAI.
If any additional information is needed, please contact Mr. Dave Robillard at (61 0) 765-5952.
I declare under penalty of perjury that the foregoing is true and correct.
Respectfully, Director - Licensing & Regulatory Affairs AmerGen Energy Company, LLC Enclosures cc:
S. J. Collins, Administrator, USNRC Region 1 G. E. Miller, USNRC Project Manager, Oyster Creek M. S. Ferdas, USNRC Senior Resident Inspector, Oyster Creek File No. 04036
ENCLOSURE 1 ONE-TIME ACTION (Y es/No)
NO LIST OF REGULATORY COMMITMENTS PROGRAMMATIC (Yes/No)
YES The following table identifies those actions committed to by AmerGen Energy Company, LLC (AmerGen) in this document. Any other statements in the submittal are provided for information purposes and are not considered to be regulatory commitments.
COMMITMENT AmerGen will revise calculation C-1302-21 5-E320-063, RWCU HELB High Temperature Setpoint Error Calculation, to only include the as left tolerance once in the calculation of the upper as found limit.
COMMIlTED DATE Prior to implementation of the approved license amendment to incorporate the RWCU HELB instrumentation in the Technical COMMITMENT TYPE I