ML20010G671

First Interim Deficiency Rept Re Minor Corrosion Detected on Internals of Unit 2 Standby Svc Water Sys B Pump, Originally Reported on 810225.Caused by Excessive Amount of Sulphuric Acid.Final Rept to Be Filed by 811101

ML20010G671
Person / Time
Site:	Grand Gulf
Issue date:	09/09/1981
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-81-349, NUDOCS 8109220389
Download: ML20010G671 (5)

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, a MISSISSIPPI POWER & LIGHT COMPANY

] Helping Buila Mississippi EmMMhhildd5 P. O. B O X 164 O. J AC K S O N. MIS SIS SIP PI 3 9 2 05 J AMES P. McGAUGHY, JR.

ASDSTANT VICE PRESMT r 9, 1981 h ' / q)

I Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Region II

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Attention: Mr. J. P. O'Reilly, Dir'ctor

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Dear Mr. O'Reilly:

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SUBJECT:

Grand Gulf Nuclear Station N Units 1 and 2 Docket Nos. 50-416/417 File 0260/15525/15526 PRD-81/15, Interim Report No. 1 Corrosion to SSW Pump AECM-81/349 On February 25, 1981, Mississippi Power & Light Company notified Mr. P.

A. Taylor, of your of fice, of a Potentially Reportable Deficiency (P2D) at the Grand Gulf Nuclear Station (GCNS) construction site. The deficiency concerns minor corrosion detected on the internals of the Unit 2 Standby Service Water (SSW) System "B" Pump.

During our investigation of this deficiency, it was discovered that other damage had also occurred to the Unit 2 SSW "B" Pump as well as to the Unit 1 SSW "B" Pump and the HPCS Service '4ater Pump. We are continuing our evalua-tion to determine the extent of the deficiency and effects on safety. We expect to submit a final report by November 1, 1981.

Attached is our interim report.

Yours truly,

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J. P. McGaughy, Jr.

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l 81092203Er9 810900 PDR S

ADOCK 050004i7 PDR Member Middle South dtilities System

Mr. J. P. O'Reilly AECM-81/349 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

Mr. G. B. Taylor South Miss. Electric Power Association P. O. Box 1589 Hattiesburg, MS 39401 1

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bec: Dr. D. C. Globs Mr. J. Leatherman Mr. J. N. Ward Manager of BWE-6 Licensing Mr. J. P. McGaughy, Jr. General Electric Company Mr. J. D. Heaton 175 Curtner Avenue Mr. R. Trickovic San Jose, Ca. 95125 Mr. J. W. Yelverton Mr. L. F. Dale Mr. C. K. McCoy Mr. E. M. Houston Mr. T. H. Cloninger U. S. Nuclear Regulatory Commission Mr. R. A. Ambrosino Division of Licensing Mr, A. J. Iosue Washington, D. C. 20555 Mr. G. B. Rogers Mr. S. H. Hobbs Mr. L. E. Ruhland Mr. J. Matore Mr. D. L. Hunt U. S. Nuclear Regulatory Commission Mr. A. G. Wagner Division of Licensing Mr. P. A. Taylor Washington, E. C. 20555 PRD File i

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, s Attchment to AECM-81/349 Pega 1 of 2 INTERIM REPORT NO. 1 TO PRD-81/15 I. Description of the Deficiency Minor acid etching of the Unit 2 Standby Service Water (SSW) "B" Pump intermediate bowl was detected during reassembly of the pump following repairs to various pump components. Repairs were being made because of previous acid damaga to the pump.

The deficiency is known to affect the Unit 2 SSW "B" Pump. Investiga-tions are underway to determine its applicability to the Unit 1 3SW "B" Pump and the High Pressure Core Spray Service Water Pump.

We are continuing our evaluation of the safety implications of this deficiency to determine if the deficiency could adversely affect the safety of operations of the nuclear power plant.

II. Approach to Resolution of the Problem The cause of the pump corrosion was the addition of more sulphuric acid than was required to the SSW "B" basin. The acid was added in an attempt to reduce the alkalinity.

At the time of the addition of the acid, the SSW basin level transmitters were not operable and construction of the acid additiod system for the SSW basin was not complete. This resulted in large quantities of acid being dumped directly into the basin, resulting in poor mixing of the acid and water, causing a high concentration of acid in various areas of the basin. Only SSW basin "B" was affected.

The high acidity of the basin cater was known to have caused corrosion damage to the Unit 2 SSW "B" Pump. This pump was repaired by the vendor (Goulds Pumps, Inc.). The extent of the damage to the other pumps (if any) is not known at this time. To preclude recurrence of the condition, the SSW basin level transmitters have been installed and are operable, providing a positive and accurate method for determining the quantity of l

water in the basins. The acid addition system has been completed and is i operable. This will provide a controlled method of adding acid and i

ensuring proper mixirg of acid and water to ensure a uniform mixture throughout the basin.

III.- Status of Proposed Resolution The extent of the deficiency has not been fully determined. Along with our Constructor, we are investigating other items, i.e. piping and valves, which could possibly have been affected by the reduced pH water.

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,' 3 Attcchment to AECM-81/349 Prga 2 of 2

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IV. Reason Why_ A Final Report Will Be Delayed The investigation into the extent of the deficiency and known safety implications has not been completed.

V. Date When A Final Report Will Be Submitted A final report will be submitted by Novumber 1, 1981.

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