ML19340D782

Status Rept 4 Re Potential Reportable Deficiency 80/04 Concerning Loss of Site Power on Rod Position Indication & Neutron Monitoring.Matter Is Under Review.Determination of Reportability & Final Rept Due by 810421

ML19340D782
Person / Time
Site:	Grand Gulf
Issue date:	12/30/1980
From:	Mcgaughy J MISSISSIPPI POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
AECM-80-318, NUDOCS 8101050346
Download: ML19340D782 (2)

Text

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EdWAMinaE MISSISSIPPI POWER & LIGHT COMPANY Helping Build Mississippi P. O. B O X 16 4 0. J A C K S O N, MI S SIS SIP PI 3 9 2 0 5 JR December 30, 1980.'

JAMES P McGAUGHY.,e assvi,a wce msics . ,-

Office of Inspection & Enforcement .

U.S. Nuclear Regulatory Commission ~

Region II - -

101 Marietta Street, N.W. , g _ .j 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 #4, Effects of Loss of Site Power on Rod Position Indication and Neutron Monitoring AECM-80/318

References:

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

2) AECM-80/105, 5/21/80

3) AECM-80/163, 7/23/80 On March 17, 1980, Mississippi Power & Light discussed the subj ect condition with Mr. F. Cantrell of your _of fice. 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 investigationssuch as NRC IE Bulletin No. 79-27, " Loss of Non-Class lE Instrumentation and Control Power System Bus During Operation", and NRC Regulatory Guide 1.97, " Instrumentation for Light-Water-Cooled Nuclear Power Plants to assess Plant Conditions During and Following an Accident". Our Architect / Engineer and NSSS Supplier are currently evaluating the aforementioned Bulletin and Regulatory Guide. Our schedule for the evaluation of the aforementioned Bulletin has been expedited due to recent guidance from the NRC in k'ashington (Robert L. Tedesco), dated December 12, 1980.

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B10 i o r 03'/'(p /0 g Membeh 51iddle South Utilities System

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MISSISSIPPI POWER & LIGHT COMPANY AECM-80/318 i Page 2 We expect to provide a determination on reportability and final report by April 21, 1980.

Yours truly, v

f # J. P. McGaughy, Jr.

EWC:sa cc: Mr. N. L. Stampley Mr. R. B. McGehee Mr. T. B. Conner Mr. Victor Stello, Director Division of Inspection & Enforcement U. S. Nuclear Regulatory Commssion Washington, D. C. 20555 i

Mr. G. B. Taylor South Miss. Electric Power Association P.O. Box 1589 Hattiesburg, MS 39401 4

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