ML20071H821

Interim Deficiency Rept 3 Re Low Measured Flow Rate in ESF Electrical Switchgear Room Cooling Sys.Safety Implications & Reportability Not Determined.Final Rept Expected by 820415

ML20071H821
Person / Time
Site:	Grand Gulf
Issue date:	02/15/1982
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-82-62, NUDOCS 8203080550
Download: ML20071H821 (3)

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j j M IS SIS S.lP P.l: POWER & LIGHT COMPANY a n Helping Build Mississippi EdelMudd5 P. O. B O X 16 4 0, J A C K S O N. MIS SIS SIP PI 3 9 2 05 12 FF n la Pl.20

1. $dsi$r$YNOr5'[ February 15, I t- @

Of fice of Inspection & Enforcement S

U. S. Nuclear Regulatory Commission OEC$ge.g $

Region II 9; ,

101 Marietta Street, N.W. _

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lh4%II Suite 3100 -

Atlanta, Georgia 30303 Y g /y Mr. J, 4 DP Attention: eilly, Regional Administrator N '

SUBJECT:

Grand Gulf Nuclear Station Units 1 and 2 Docket Nos. 50-416/417 File 0260/15525/15526 PRD-81/17, Interim Report #3, Flow Rate of ESF Electrical Switchgear Room Coolers AECM-82/62 Refe rence : AECM-81/362, 9/23/81 AECM-81/494, 12/15/81 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 (GGNS) construction site. The deficiency concerns a lower measured flow rate in the ESF Electrical Switchgear Room Cooling Syatem than was required by the drawings. This report was originally scheduled to be submitted on January 31, 1982, but an extension was obtained f rom Mr. R. Butcher on February 2,1982.

Our investigation into the deficiency is not complete. Safety implica-tions and reportability have not been determined. Results of the evaluation l thus far are contained in our attached interim report. We expect to submit a final report by April 15, 1982.

1 Yours truly, gy J. P. McGaughy, Jr.

KDS:dr ATTACHMENT cc: See page 2 g; p M

• 8203080550 820215

{DRADOCK 05000416 I6 17 Member Middle South Utilities System hlf(

e o . 1 Mr. J. P. O'Reilly AECM-82/ 62 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. 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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} Attach =snt to AECM-82/62 Pegs 1 of 1 Interim Report #3 to PRD-81/17 I. Description 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 CPM. Flow point FP-N068B is located down-stre'am from the ESF 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 systems 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-N068B. We have reviewed PRD-80/32 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 causu 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 cannot be completed until the Emergency Core Cooling System (ECCS) integrated Icak rate testing has been completed. This is to assure that full flow will be available when balancing Loops A & B.

IV. Reason Why A Final Report Will Be Delayed ,

Mississippi Power & Light has not completed testing and balancing of th-systems involved.

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 We expect to submit a final report by April 15, 1982.

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