AECM-82-362, Suppl to Final Deficiency Rept Re Error in Calculations for Impingement Loads on Targets During High Energy Pipe Line Breaks.Initially Reported on 820521.Addl Target Area Identified.Also Reported Per Part 21

Suppl to Final Deficiency Rept Re Error in Calculations for Impingement Loads on Targets During High Energy Pipe Line Breaks.Initially Reported on 820521.Addl Target Area Identified.Also Reported Per Part 21

ML20063M788
Person / Time
Site:	Grand Gulf
Issue date:	09/07/1982
From:	Mcgaughty J, Mcgaughy J MISSISSIPPI POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
REF-PT21-82 10CFR-050.55E, 10CFR-50.55E, AECM-82-362, NUDOCS 8209160116
Download: ML20063M788 (2)

Text

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. e MISSISSIPPI POWER & LIGHT COMPANY Helping Build Mississippi P. O. B OX 164 0, J A C K S O N, MIS SIS SIP PI 3 9 2 05 September 7, 1982 JAMES P. McGAUGHY, JR.

ASSISTANT VICE PRESIDENT Office of Inspection & Enforcement U. S. Nuclear Regulatory Couission Region II 101 Marietta Street, N.W.

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

Dear Mr. O'Reilly:

SU3 JECT: GrandGulfNuclearSt,hflon :. ,

Units 1 and 2 ;p License No. NPF-13 r  :.d Docket Nos. 50-416/41P .-* ;7 File 0260/15525/1552G dO .

PRD-82/30, Supplement to D Final Report , Jet ImpEngemetfe$

AECM-82/362 CD 'jg c

Reference:

AECM-82/287, 6/21/82 $ t. :

On May 21, 1982, Mississippi Power & Light Company notified Mr. R. Butcher, of your office, of a Potentially Reportable Deficiency (PRD) at the Grand Gulf .

Nuclear Station (GGNS) construction site. The deficiency concerns an error in the calculations for impingement loads on targets during high energy pipe line breaks.

This deficiency was reported by MP&L under the provlstons of 10CFR50.55(e) and 10CFR21 and by Bechtel Power Corporation under the provisions of 10CFR21.

Our referenced Final Report, stated that, based on the evaluations performed to date, three (3) items were af fected.

One of the actions to prevent recurrence consisted of revising and reissuing Specification 9645-M-195.0. Following the revision, a walkdown was pe rformed by our Architect / Engineer to identify and evaluate new targets.

This walkdown identified an additional target, Reactor Pressure Vessel Head Spray piping 6" DBA-30 (Q1E12). To protect this target, jet barrler C-A-1842 has been designed and the design issued for f abrication and installation.

This barrier will be installed prior to nuclear heatup on Unit 1.

You s tr ly, 6

J. P. McGaughy, Jr.

KDS:dr See Page 2 for distributton -

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8209160116 820907 ember Middle South Utilities System PDR ADOCK 05000416 p 4 S PDR J-

Mr. J. P. O'Reilly AECM-82/362 NRC Page 2 cc: Mr. N. L. Stampley Mr. R. B. McGehee Mr. T. B. Conner Mr. Richard C. DeYoung, Director Office of Inspection & Enforcement U. S. Nuclea r Regulatory Commission Washington, D.C. 20555 Mr. G. B. Taylor South Miss. Electric Power Association P. O. Box 1589 Hattiesburg, MS 39401

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