ML20059H808
| ML20059H808 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 01/13/1994 |
| From: | Hutchinson C ENTERGY OPERATIONS, INC. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| GNRO-94-00010, GNRO-94-10, NUDOCS 9401310169 | |
| Download: ML20059H808 (2) | |
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Entergy Operations,Inc.
22 ENTERGY Nt G n on M'3 39150 Td EG t a37 2nnD C. R. Hutchinson
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January 13, 1994 U.S. Nuclear Regulatory Commission Mail Station P1-37 Washington, D.C.
20555 Attention:
Document Control Desk
Subject:
Grand Gulf Nuclear Station Docket No. 50-416 License No. NPF-29 Grand Gulf Nuclear Station (GGNS) Implementation of Redundant Power Supplies for Neutron Monitoring System (EHS) Recorders GNRO-94 / 00010 Gentlemen:
By letter to the BWR Owners Group dated January 13, 1993 the NRC found the alternate criteria of NEDO-31558 for neutron flux monitoring instrumentation acceptable in lieu of Regulatory Guide 1.97 criteria for currently licensed BWRs.
On March 15, 1993, Entergy Operations submitted a Plant Specific Design Evaluation for NEDO-31558, comparing the Grand Gulf Nuclear Station NMS against the NEDO requirements.
The NRC's safety evaluation report for NEDO-31558 recommended that each licensee perform a plant specific evaluation of the power distribution to the neutron flux monitoring instrumentation, including recorders.
GGNS reviewed the power distribution for neutron flux-monitoring ir e trumentation, and determined that the neutron flux monitoring recorders were powered by the same non-class lE uninterruptible power supply (UPS).
During the refueling outage recently completed (RFO6), GGNS implemented _a design change to provide redundant non-class ~1E UPS power to these recorders, thus providing assurance that loss of a single UPS will not cause loss of redundant neutron flux monitoring recorders per the recommendations the safety evaluation report.
On a related matter, discussions with other utilities revealed differing interpretations of Section 5.2.2 of NEDO-31558, regarding accuracy.
Some utilities were interpreting the 2% accuracy criteria as including recorders, and others as the subsystem loop accuracy exclusive of Q
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recorders.
The BWROG NMS Committee issued a position to j
clarify what the requirements of this section include.
The Committee position is that the 2% NMS accuracy specified in the NEDO does not include indicators or recorders.
This is the position GGNS used in our March 15, 1993 submittal.
The recorder output is periodically tested and is adequate for j
operator guidance.
i Based upon GGNS compliance with NEDO-31558 requirements and the implementation of redundant non-class 1E UPS recorder power supplies, GGNS requests that the Proposed Amendment to Operating License (PCOL-93/03), dated April 21, 1993, be granted.
Please direct any questiens or comments to Ricky Patterson at (601) 437-6466.
Yours tru y,
/
/
/
, lg h /PW
/
CRH/RLP/ams cc:
Mr.
R.
H. Bernhard (w/o)
Mr. H.
W. Keiser (w/o)
Mr. R. B. McGehee (w/o)
Mr. N.
S. Reynolds-(w/o)
Mr. H.
L. Thomas (w/o)
Mr. Stewart D. Ebneter (w/o)
Regional Administrator U.
S. Nuclear Regulatory Commission Region.II 101 Marietta St.,
N.W.,
Suite 2900 Atlanta, Georgia 30323 Mr. P. W.
O'Connor, Project Manager (w/2)
Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Mail stop 13H3 Washington, D.C.
20555 h
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