ML20128N132

Forwards SE Accepting Proposal to Raise Design Groundwater Level from 109 Ft Above Msl to 114.5 Ft Above Msl

ML20128N132
Person / Time
Site:	Grand Gulf
Issue date:	02/17/1993
From:	Oconnor P Office of Nuclear Reactor Regulation
To:	Cottle W ENTERGY OPERATIONS, INC.
Shared Package
ML20128N137	List: ML20128N132 ML20128N138
References
TAC-M79323, NUDOCS 9302230075
Download: ML20128N132 (3)

Text

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UNITED STATES

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~E NUCLEAR REGULATORY COMMISSION h

WASHINoTON, D.C. 2C656

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February 17, 1993 Docket No. 50-416 Mr. William T. Cottle Vice President, Operations GGNS Entergy Operations, Inc.

Post Office Box 756 Port Gibson, Mississippi 39150

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SUBJECT:

GROUND WATER LEVEL CONTROL AND MONITORING - GRAND GULF NUCLEAR x^

STATION (TAC NO. M79323)

The NRC staff has reviewed exceedances of the Grand Gulf design basis ground water level of 109.0 feet above mean sea level (ms1) that have occurred during the construction and operation of the facility. The staff's August 19, 1985, safety evaluation required that you submit a final report regarding a final i

projection of the maximum post-construction ground water level (GWL) and resolution of exceedance to the design basis GWL.

In addition, you were required to report to the NRC any occurrences of GWLs in the power block area that exceeded the design basis level (109 feet above msl).

The staff has completed the review of your April 30 and September 25, 1992, submittals regarding GWL control and monitoring. The staff also held a telephone conference with representatives of your staff on December 23,1992, anti obtained clarifications on certain aspects of-the submittals referred to above. These submittals deal with two issues, namely,1) raising the Design Ground Water Level (DGWL) from Elevation (E1) 109 feet above msl to El 114.5 Yeet above ms'., and 2) discontinuing Entergy Operations, Inc.'s (E01's) current GWL monitoring program.

- Based on a review of your submittals, tha staff accepts your proposal to raise-the DGWL from 109 feet above msl to 114.5 feet above msl. This is acceptable based on your structural calculations that verify that this action does not compromise the structural stability of the safety-related structures due to the increased hydrostatic loading.

The staff also accepts your proposal to discontinue the current E01 GWL monitoring program, subject to the following commitments made in your September 1992 response and again during a teleconference on December 23, 1992:

1) continue to monitor.the GWLs by measuring the water levels in a representative sample of the wells in the power block area at intervals.

determined by your engineering' staff (and after periods of heavy rainfall),

and report to NRC if the GWL exceeds revised DGWL; and 2) carry out a visual

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inspection of the cooling tower during each refueling outage to verify that no potential leakage paths exist which would cause the GWL to rise above the_new-DGWL.

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t Mr. William T. Cottle,

A copy of the staff's detailed safety evaluation is unclosed. This completes the staff's action on this issue.

Sincerely, A

i Paul W. O'Connor, Senior Project Manager Project Directorate IV-1 Division of Reactor Projects - III/IV/V Office of. Nuclear Reactor Regulation

Enclosure:

Safety Evaluation cc w/ enclosure:

See next page i

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$Ik Mr. W. T. Cottle T, -

Entergy Operations, Inc.

Grand Gulf Nuclear Station CC:

Mr. Donald C. Hintz, President Mr. C. R. Hutchinson and Chief Executive Officer GGNS General Manager Entergy Operations, Inc.

Entergy Operations, Inc.

P. O. Box 31995 P. O. Box 756 Jackson, Mississippi 39286-1995 Port Gibson, Mississippi 39150 Robert B. McGehee, Esquire The Honorable William J. Guste, Jr.

Wise, Carter, Child & Caraway Attorney General P. O. Box 651 Department of Justice Jackson, Mississippi 39205 State of Louisiano P. O. Box 94005 Nicholas S. Reynolds, Esquire Baton Rouge, Louisiana 70804-9005 Winston & Strawn 1400 L Street, N.W. - 12th floor Alton B. Cobb, M.D.

Washington, D.C.

20005-3502 State Health Officer State Board of Health Mr. Jack McMillan, Director P. O. Box 1700 Division of Solid Waste Management Jackson, Mississippi 39205 Mississippi Department of Natural Resources Office of the Governor P. O. Box 10385 State of Mississippi Jackson, Mississippi 39209 Jackson, Mississippi 39201 President, Mike Morre, Attorney General Claiborne County Board of Supervisors Frank Spencer, Asst.. Attorney General Port Gibson., Mississippi 39150 State of Mississippi Post Office Box 22947 Regional Administrator, Region II Jackson, Mississippi 39225 U.S. Nuclear Regulatory Commission 101 Marietta St., Suita 2900 Mr. John P. McGaha Atlanta, Georgia 30323 Vice President, Operations. Support Entergy Operations, Inc.

Mr. Michael J. Meisner P.O. Box 31995 Director, Nuclear Licensing Jackson, Mississippi 39286-1995 Entergy Operations, Inc.

P. O. Box 756 Mr. S. S. Chan-Port Gibson, Mississippi 39150 Project Engineer Bechtel Power, Corporation Mr. K. G. Hess P.O. Box 2166 Bechtel Power Corporation Houston, Texas 77252-2166 P. O. Box 2166 Houston, Texas 77252-2166 Mr. Rudolph H. Bernhard Senior Resident Inspector U.S. Nuclear Regulatory Commission Route 2, Box 399 Port Gibson, Mississippi 39150

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