ML20009G577

First Status Rept on Potential Deficiency Re Reactor Mounting Channels,Initially Reported on 810416.GE Informed That Info Submitted Is Incorrect.Deficiency Not Reportable Per 10CFR50.55e.Final Rept Expected by 811012

ML20009G577
Person / Time
Site:	Grand Gulf
Issue date:	07/22/1981
From:	Mcgaughy J MISSISSIPPI POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
10CFR-050.55E, 10CFR-50.55E, AECM-81-261, NUDOCS 8108040439
Download: ML20009G577 (4)

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( @lCIAL COPY MISSISSIPP WER & LIGHT COMPANY

] Helping Build Mississippi P. O. B O X 164 0, J A C K S O N, MIS SIS SIP PI 3 9 2 0 5 EmiMGMdd5 M

1. [ssfsEs 7 j[d',7 July 22, 1981 Office of Inspection & Enforcement h' \

U. S. Nuclear Regulatory Commission 6/ Q[k(,,U I i @k '

Region II 101 Marietta Street, N.W.

Suite 3100 16 O3@~

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

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SUBJECT:

Grand Gulf Nuclear Station Units 1 and 2 Docket Nos. 50-416/417 File 0260/15525/15526 I

PRD-81/24, Status Report #1, l Reactor Mounting Channels

! AECM-81/261

Reference:

AECM-81/173, 5/18/81 l

On April 16, 1981, Mississippi Power & Light Company notified Mr. P. A.

Taylor, of your office, of a Potentially Reportable Deficiency (PRD) at the Grand Gulf Nuclear Station (GGNS) construction site. When we first notified your office, we indicated that the deficiency was due to structural damage sustained by the mounting channels during shipment to the jobsite. We also reported that this deficiency, if left uncorrected, could have adversely affected the safety of operations of the nuclear power plant over the lifetime of the plant, and was thus reportable under 10CFR50.55(e). The information as l reported had been furnished to Mississippi Power & Light by General Electric, our NSSS vendor, who had been informed by Morrison-Knudsen, the supplier of the diesel generator.

We have since been informed by General Electric that the above informa-tion is incorrect. The damage did not occur to equipment delivared to Grand Gulf Nuclear Station but to the Skagit Project of Puget Sound Power & Light.

When the damage was discovered at Skagit, it was noted that the channels were undersized. The channels at Skagit as well as the ones at GGNS were replaced.

Since the channels were not damaged, MP&L is withdrawing their previous TP-7 i $

statement that this deficiency is reportable under the provisions of 10CFR50.55(e). We are currently investigating, along with General Electric, j7 the effects on safety of the nuclear power plant if the undersized channels had not been replaced.

8108040439 910722 PDR ADOCK 05000416 S PDR

a Mr. J. P. O'Reilly . AECM-81/261 Page 2 When Mississippi Power & Light was informed that the information they had previously sent to the NRC was inaccurate, we telephoned Mr. Floyd Cantrell on June 2,1981 to advise him of this fact. He requested that we send an updated report in July.

We expect to make our Final Report on October 12, 1981. Attached is Status Report No. 1.

Yours truly,

/

' ~

J. P. McGaughy, Jr.

KDS:dr ATTACHMENT cc: Mr. N. L. Stampley Mr. R. B. McGehee Mr. T. B. Conner Mr. Victor Stello, Director Office of Inspection & Enforcement U. S. Nuclear 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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l bbe: Mt. D. C. Lutken . J. Letherman Dr. D. C. Gibbs Manager of BWR-6 Licensing l Mr. J. N. Ward , General Electric Company Mr. J. P. McGaughy Jr. 175 Curtner Avenue Mr. W. A. Braun San Jose, Ca. 95125 Mr. R. Trickovie Mr. J. W. Yelverton Mr. L. F. Dale P.r. D. M. Houston Mr. C. K. McCoy U. S. Nuclear Regulatory Commission I Mr. T. H. Cloninger Division of Licensing Mr. R. A. Ambrosino Washington, D. C. 20555 l Mr. R. C. Fron Mr. G. B. Rogers Mr. M. R. Williams Mr. L. E. Ruhland Mr. D. L. Hunt Mr. A. G. Wagner Mr. P. A. Taylor PRD or Inspection Report File File I

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Attachment to AECM-81/261 Page 1 of 1 STATUS REPORT NO. 1 FOR PRD-81/24 I. Description of the Deficiency Morrison-Knudsen informed our NSSS vendor that the reactor mounting channels installed in Panel Q1H22Pil8 were a different size from the hardware on which the seismic qualification tests were run. This condition was discovered when similar equipment furnished by Morrison-Knudsen to the Skagit Project of Puget Sound Power & Light sustained damage during shipment to the jobsite. The tested equipment had 3/16" aluminum brackets whereas the reactors in the Grand Gulf and Skagit panels were mounted on 1/8" aluminum brackets.

Systems affected were the High Pressure Core Spray (E22) and the HPCS Diesel Generator (P81). The deficiency affects Unit I and Unit 2. It is applicable only to the NSSS scope of supply.

We are currently investigating the ef fect on safety of operations of the nuclear prower plant if this condition had remained uncorrected and the reportability under the provisions of 10CFR21.

II. Approach to Resolution of the Problem l

The cause of the problem was that the wrong reactor mounting hardware was furnished by the control panel manufacturer as a result of the manufacturer's error. This occurred on equipment for both Unit I and Unit 2.

To correct the deficiency the mounting hardware was changed at the jobsite to 3/16" aluminum brackets. Since no further similar equipment will be furnished to GG'3S, actions to preclude recurrence are not necessary.

III. Status of Proposed Resolu_lon The NSSS vendor is currently evaluating the ef fect on safety of the nuclear power plant, had this condition remained uncorrectec.

IV. Reason Why a Final Report Will Be Delayed The NSSS vendor has not completed its investigation.

V. Date When Final Report Will Be Submitted October 12, 1981 i

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