ML19330A898

Provides Status of Potentially Reportable Deficiency Re Loss of Offsite Power Accident & Effects on Rod Position Sys & Neutron Monitoring Sys.Deficiency Still Under Investigation.Final Rept Will Be Provided by 801230

ML19330A898
Person / Time
Site:	Grand Gulf
Issue date:	07/23/1980
From:	Mcgaughy J MISSISSIPPI POWER & LIGHT CO.
To:
References
AECM-80-163, NUDOCS 8007290714
Download: ML19330A898 (2)

Text

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o MISSISSIPPI POWER & LIGHT COMPANY Helping Build Mississippi P. O. B O X 1840, J A C K S O N, MIS SIS SIP PI 3 9 2 0 5 Nucuan m cuCUoN oEPARTMENT July 23, 1980 Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, N.W.

Suite 3100 Atlanta, Georgia 30303 Attention: Mr. J. P. O'Reilly, Director

SUBJECT:

Grand Gulf Nuclear Station Units 1 and 2 Docket Nos. 50-416/417 File 0260/15525/15526 PRD-80/04, Status Report #3, Effects of Loss of Site Power on Rod Position Indication and Neutron Monitoring AECM-80/163

References:

1) AECM-80/66, 4/3/80

2) AECM-80/105, 5/21/80 On March 17, 1980, Mississippi Power & Light discussed the subject condition with Mr. F. Cantrell of your office. Based on this discussion, MP&L agreed to process this matter as a potentially reportable deficiency. This deficiency pertains to the Loss of Site Power (LOSP) accident and its attendant effects on Rod Position In-formation System (RPIS) and Neutron Monitoring System (NMS).

This deficiency is still under investigation due to the complex nature of the issue and its relationship to other investigations asso-ciated with NRC IE Bulletin No. 79-27, " Loss of Non-Class 1E Instru-mentation and Control Power System Bus During Operation", and NRC Regulatory Guide 1.97, " Instrumentation for Light-Water-Cooled Nuclear Power Plants to Assess Plant Ccnditions During and Following an Ac-cident". Our Architect / Engineer and NSSS Supplier are currently eval-uating the aforementioned Bulletin and Regulatorf Guide.

We expect to provide a determination on reportability and final report by December 30, 1980.

Yours truly,

/f ezw s far J. P. McGaughy, Jr. /

Assistant Vice President, Nuclear Production 80072907/Y g Member Middle South utilities System

o MISSISSIPPI POWER C LICHT C%MPANY W. J. P. O'Reilly AECM-80/163 NRC Page 2 ATR:mt -

cc: Mr. N. L. Stampley Mr. R. B. McGehee Mr. T. B. Conner i

Mr. Victor Stallo, Director.'4 THIS COD'r mn Division of Inspection & Enforcement U. S. Nuclear Regulatory Commission ,,

Washington, D.C. 20555 i

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