ML20010G701

Interim Rept 1 Re Corrosion to Standby Svc Water Sys Pump, Initially Reported on 810225.Acid Addition Sys Operable, Which Will Provide Controlled Method of Adding Acid & Proper Mixing of Acid & Water.Final Rept Due on 811101

ML20010G701
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 8109220427
Download: ML20010G701 (5)

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MISSISSIPPI POWER & LIGHT COMPANY

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Helping Build Mississippi P. O. BOX 1640 J ACKSON MISSISSIPPI 39205

1. $s!$rNaNs7cNr Septamber 9,1981 Office of Inspection & Enforcement  ?.1 ^I

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U. S. Nuclear Regulatory Commission Region II Q s

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101 Marietta Street, N.W.

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Atlanta, Georgia 30303

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Attention: Mr. J. P. O'Reilly, Director -

De&r Mr. O'Reilly:

SUBJECT:

Grand Gulf Nuclear Station '[

Units 1 and 2 Docket Nos. 50-416/417 File 0260/15525/15526 PRD-31/15, Interim Report No. 1 Corrosion to SSW Pump AETM-81/349 On February 25, 1981, Mississippi l'ower & Light Company notified Mr. P.

A. Taylor, of your of fice, of a Potentially Reportable Deficiency (PRD) at the Grand Gulf Nuclear Station (GGNS) 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 Water Pump. We are continuing our evalua-tion to determine the extent of tiie deficiency and effects on safety. We expect to submit a final report by November 1, 1981.

Attached is our interim report.

Yours truly, J. P. McGaughy, Jr.

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7 g922 0 Q Member Middle South Utilities System S

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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 i

U. S. Nuclear Regulatory Commission

, Washington, D.C. 20555 Mr. G. B. Taylor

, South Miss. Electric Power Association F. O. Box 1589 Hattiesburg, MS 39401 4

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, ;, ' 's bec: sr. D. C. Gibbs Mr. J. Leatherman Mr. J. N. Ward Manager of BWR-6 Licensing Mr. J . ?* McGaughy, Jr. General Electric Company Mr. J. D. Heaton 175 Curtner Avenue Mr. R. Trickovic San Jose, Ca. 95125 l Mr. J. W. Yel'< 2rton Mr. L. F. Dale )

Mr. C. K. McCoy Mr. L. M. Houston Mr. T. H. Cloninger U. S. Nuclear Regulatory Commission Mr. R. A. Ambrosino Division of Licesing 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 Liceneing Mr. P. A. Taylor Washington, D. C. 20555 PRD File File 9

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Attachment to AECM-81/349 Page 1 of ?

INTERIM REPORT NO. 1 TO PRD-81/15

1. Description of the Deficiency Minor acid etching of i.tse Unit 2 Standby Service Water (SSW) "B" Pump intermediate bowl was detected during reassembly of the pump following repairs to variou4 pump components. Repairs were being made because of previous acid damage 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 i SSW "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 coulu adversely af fect the safety of operations of the nuclear power plant.

II. Approach to Resolution of the Problem

?te 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 addition system for the SSW basin was not complete. This resulted la 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 th'e basin water 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. Ta preclude recurrence of the condition, the SSW basin level transmitte'rs!have been installed and are operable, providing a positive and accurate method for determining the quantity of water in,the basins. The acid a'dition system has been completed,and.is operable. This will provide a controlled method of adding acid and ensuring proper mixing 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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Attachment to AECM-81/349 Page 2 of 2

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IV. Reason Why A Final Report Will Be Delayed l

The irevitigation into the extent of the deficiency and known safety l implint. ions has not bee 3 i ompleted. l l

V. Date When A Final Report ' Jill Be Submitted A final report '

,11 be submitted by Novner 1,1981.

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