GNRO-2015/00042, Response to License Amendment Request for Revision of Five Technical Specification Allowable Value Setpoints Request for Additional Information, Set No. 2, Revision 1
| ML15181A152 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 06/30/2015 |
| From: | Kevin Mulligan Entergy Operations |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| GNRO-2015/00042 | |
| Download: ML15181A152 (4) | |
Text
Q
~Entergy GNRO-2015/00042 June 30, 2015 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001 Entergy Operations, Inc.
P. O. Box 756 Port Gibson. MS 39150 Kevin Mulligan Site Vice President Grand Gulf Nuclear Station Tel. (601) 437-7400
SUBJECT:
REFERENCE:
Dear Sir or Madam:
Response to License Amendment Request for Revision of Five Technical Specification Allowable Value Setpoints Request for Additional Information, Set #2, Rev 1 Grand Gulf Nuclear Station, Unit 1 Docket No. 50-416 License No. NPF-29
- 1. Entergy Letter, "License Amendment Request for Revision of Five Technical Specification Allowable Value Setpoints," GNRO-2014/00014, dated August 1, 2014 (ADAMS Accession No. ML14216A383).
Entergy Operations, Inc. is providing a revised docketed response to the concern raised via teleconference regarding the License Amendment Request for Revision of Five Technical Specification Allowable Value Setpoints in the Attachment. The attached information is being provided per Nuclear Regulatory Commission (NRC) request for documentation and record keeping purposes.
This letter contains no new commitments. If you have any questions concerning this submittal, please contact Mr. James Nadeau at (601) 437-2103.
I declare under penalty of perjury that the foregoing is true and correct; executed on June 30, 2015.
Sincerely, KJM/tmc
Attachment:
Response of Teleconference Concern cc (See next page)
GNRO-2015/00042 Page 2 of 2 cc:
u.s. Nuclear Regulatory Commission ATIN: Mr. A. Wang, NRR/DORL (w/2)
Mail Stop OWFN 8 B1 11555 Rockville Pike Rockville, MD 20852-2738 u.S. Nuclear Regulatory Commission ATIN: Mr. Marc L. Dapas (w/2)
Regional Administrator, Region IV 1600 East Lamar Boulevard Arlington, TX 76011-4511 NRC Senior Resident Inspector Grand Gulf Nuclear Station Port Gibson, MS 39150
Attachment to GNRO-2015/00042 Response to Teleconference Concern
Attachment to GNRO-2015/00042 Page 1 of 1 Concern:
Four of the 5 Allowable Values included in the License Amendment Request (LAR) calculations left out the 1.645/2 term. The concern is that, while conservative, this is a deviation from the General Electric (GE) setpoint methodology described in NEDC-31336P-A, 'General Electric Instrument Setpoint Methodology'.
Response
The term 1.645/2 was deliberately not included in the calculations for 4 of the 5 Allowable Values (AV) (resulting in a more conservative value) since the setpoints were double-bounded.
The one single-bounded AV included the term due to it being single bounded. Grand Gulf Nuclear Station's calculations are performed in accordance with JS09, 'Methodology for the Generalization of Instrument Loop Uncertainty and Setpoint Calculations', which allows the inclusion of the 1.645/2 term for cases with limited margin. Upon receipt of the license amendment, Grand Gulf Nuclear Station will revise the 4 calculations to include the new AVs and an explanation regarding non-inclusion of the 1.645/2 term in the double-bounded cases.