ML19350B811

Interim Deficiency Rept Re Installation of Standby Svc Water Pump,Initially Reported on 810212.Pumps in Basins a & B Inspected for Deficiency & Installation Compared W/Design Drawings.Final Rept to Be Submitted by 810901

ML19350B811
Person / Time
Site:	Grand Gulf
Issue date:	03/16/1981
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-81-109, NUDOCS 8103230726
Download: ML19350B811 (4)

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'j i MISSISSIPPI POWER & LIGHT COMPANY Helping Build Mississippi Edhhlhidaag P. O. B O X 164 0. J ACK S O N MIS SIS SIP PI 3 92 05

• Ns v *W March 16, 1981 g'Ig ,

O M(N Office of Inspection & Enforcement N goy 4 ..

U. S. Nuclear Regulatory Cocnission IJI ,

j, Region II t% ~

7 101 Marietta Street, N.W. k f'S"s '*

Suite 3100 y j7 j

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 PRD-81/08, Status Report #1, Installation of the Standby Service Water Pump AECM-81/109 On February 12, 1981, Mississippi Power & Light Company notified Mr. J.

Rausch, of your office, of a Potentially Reportable Deficiency (PRD) at the Grand Gulf Nuclear Station (GGNS) construction site. The deficiency concerns the installation of the Standby Service Water Pump (SSW Pump).

This deficiency is currently under investigation. We expect to provide to you our final report and determination of reportability by September 1, 1981. Our findings and corrective actions, to date, are summarized in the attached status report.

Yours tru ,

j J. P. McGaughy, Jr.

WHU:mt Attachment cc: See page 2 30/7 i S

I' 810823 0 Td4 Member Middie sauen utilicies system b

MISSISSIPPt POWER & LIGHT COMPANY Mr. J. P. O'Reilly AECM 81/109 NRC Page 2 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 l

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

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Attachment to AECM-81/100 Page 1 of 2 STATUS REPORT #1 TO PRD-81/08 I. Description of the Deficiency Seismic Analysis by the SSW pump supplier (Gould Pumps, Inc.) indicates a maximum calculated movement of approximately 7.8 inches. The as-built clearance between the pump bowl assembly and the west SSW Basin sump wall is ! inches.

The plant system affected by this deficiency is Stsndby Service Water (P-41) and is applicable to both Units 1 and 2.

10CFR21 is not applicable as the system has not been turned over to MP&L.

If the vendor determines that, during a seismic event, the impact of the pump bowl assembly against the sump wall could result in the failure of the pump (s), then cooling water would not be provided during an emergency shutdown of the plant.

II. Approach to Resolution of the Problem The cause of this deficiency is currently under investigation. The two SSW pumps in "A" basin have been detarmined to have this deficiency as cited above. The two SSW pumps in "B basin will be inspected for this deficiency during scheduled down time for "B" basin (the week of March 9, 1981). Those results have not been received by this office as of this date.

Remedial action will be provided by our Architect / Engineer af ter the vendor has reviewed and analyzed the condition. Corrective action to La taken to preclude recurrence of this problem will be implemented when the cause of the deficiency has been determined.

III. Status of Proposed Resolution The impact of this deficiency on safety has not been determined. The supplier of the SSW pumps is currently evaluating whether or not the l

pumps would fail by impacting the walls of the basin. If vendor analysis indicat.es that the pumps would fail during a seismic event, i

then our Architect / Engineer has asked the vendor for a quotation to l

design a restraint to limit movement of the pump during such an event.

l Our Architect / Engineer is currently investigating the installation documentation to determine whether or not the pumps were installed in accordance with design drawings. Engineering action should be completed by July 1, 1981.

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Attachment to AECM-81/109 Page 2 af 2 IV. Reason Why a Final Report Will Be Delayed The vendor (Could P'mps, Inc.) is currently evaluating the existing deficiency and has besn asked to determine either that there would be no adverse effects on the continued operation of the pumps during a seismic event in the as-built installation or that pump operation could be adversely affected. Our Architect / Engineer will analyze this information and formulate, with the 'Andor, corrective actions to be taken.

V. Date Ween Final Report Will Be Submitted We expect to file our final rep' ort on this macter on or before September 1, 1981.

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