AECM-81-494, Second Interim Deficiency Rept Re Lower Flow Rate in ESF Electrical Switchgear Room Cooling Sys,Initially Reported 810303.Measurement of Flow Rates at Various Locations Continuing.Next Rept by 820131

Second Interim Deficiency Rept Re Lower Flow Rate in ESF Electrical Switchgear Room Cooling Sys,Initially Reported 810303.Measurement of Flow Rates at Various Locations Continuing.Next Rept by 820131

ML20069B228
Person / Time
Site:	Grand Gulf
Issue date:	12/15/1981
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-81-494, NUDOCS 8112240146
Download: ML20069B228 (3)

Text

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MISSISSIPPI POWER & LIGHTM? <MPANY Helping Build Alississippo Edhhlhhildds P. O. B OX 1640, J AC K S ON MLS SISSIPPI 3 9205 JAMES P. McGAUGHY, JR.

.. p assisvi=T vice mset December 15, 1981 t-- I. 's 9 \~

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Office of Inspection & Enforcement g' R E,.. .

U. S. Nuclear Regulatory Commission DEC2n, Region II .u t ,

101 Marietta Street, N.W. i '

i Suite 3100 \

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f Atlanta, Georgia 30303 s xx s

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Attention: Mr. J. P. O'Reilly, Regional Administratoe

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SUBJECT:

Grand Gulf Nuclear Station Units 1 and 2 Docket Nos. 50-416/417 File 0260/15525/15526 PRO-81/17, Interim Report #2, Flow Rate of ESF Electrical Switchgear Room Coolers AECM-81/494

Reference:

AECM-81/362, 9/23/81 On March 3,1981, Mississippi Power & Light Company notified Mr. P. A.

Taylor, of your office, of a Potentially Reportable Deficiency (PRD) at the Grand Gulf Nuclear Station (CGNS) construction site. The deficiency concerns a lower measured flow rate in the ESF Electrical Switchgear Room Cooling System than was required by the drawings.

Our investigation into the deficiency is not complete. Safety implications and reportability have no". been determined. Results of the evaluation thus far are contained in our attached interim report. We expect to submit a final report by January 31, 1982.

Yours truly,

~/

J. P. McGaughy, Jr.

KDS:dr ATTACHMENT cc: See page 2

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8112240146 811215 DR ADOCK 03000 Member Middle South Utilities System .i

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Mr. J. P. O'Reilly AECM-81/ 494 NRC Page 2 cc: Mr. N. L. Stampley Mr. R. B. McGehee Mr. T. B. Conner Mr. Richard C. DeYoung, Director Of fice of Inspection & Enforcement U. S. Nuclear Regolatory Commission Washington, D.C. 20555 Mr. G. B. Taylor ,

South Miss. Electric Power Association P. O. Box 1589 Rattiesburg, MS 39401

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• Attachment to AECM-81/494 Page 1 of 1 Interim Report #2 to PRD-81/17

1. Deocription of the Deficiency During flushing of the Standby Service Water (SSW) System (P41), the required 40 GPM flow rate could not be obtained as measured at flow point FP-N068B. The actual flow rate measured was 20 GPM. Flow point FP-N0688 is located down-stream fron the ~"F Electrical Switchgear Room Cooler (East) at elevation 139.

The deficiency is known to affect the Standby Service Water System (P41) in Unit 1. Further investigation may reveal that other systams and/or Unit 2 are affected.

II. Approach to Resolution of the Problem Mississippi Power & Light, along with our Constructor, is investigating to determine the cause of the condition. At present it is known to apply only at flow point FP-N0683. We have reviewed PRD-30/32 to see if SSW debris may have clogged the cooler and caused the problem identified in this present deficiency. This was discounted as a possible cause when a " flush jumper" around the cooler yielded the same diminished flow reading. When the cause is determined, further investigations to determine the extent will be conducted.

Since the cause and extent of the deficiency have not been determined, corree-tive actions and actions to preclude recurrence cannot be formulated.

III. Status of Proposed Resolution

'- It has been verified that the actual location of the test point installation is in conformance with drawing / vendor requirements. Current flow balancing eval-uations are being performed.

Loop "B" flow balancing is presently being conducted. Loop "A" is presently being re-evaluated and additio,nal tests will be performed.

IV. Reason Why A Final Report Will Be Delayed Mississippi Power & Light is presently conducting tests to obtain flow readings at various locations.

When these new results are obtained, safety implications, cause and extent of the deficiency, and corrective actions will be formulated.

V. Date When A Final Report Will Be Submitted I

We expect to submit a final report by January 31, 1982.

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