ML19339A003

Part 21 Rept Re Incorrectly Ordered Throttling Valve.Valves for LPCS & RHR Sys Were Incorrectly Purchased as Shutoff Type.Final Rept Will Be Filed by 810121

ML19339A003
Person / Time
Site:	Grand Gulf
Issue date:	10/13/1980
From:	Mcgaughy J MISSISSIPPI POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
REF-PT21-80-300-000 10CFR-050.55E, 10CFR-50.55E, AECM-80-253, NUDOCS 8010310511
Download: ML19339A003 (3)

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MISSISSIPPI POWER '

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October 13, 1980 Office of Inspection & Enforcement

• U. S. Nuclear Regulatory Commission 4 Region II 101 Marietta Street, N.W.

Suite 3100 Atlanta, Georgia 30303 Attention: Mr. J. P. O'Reilly, Director

SUBJECT:

Grand Gulf Nuclear Station Units 1 and 2 Docket Nos. 50-416/417/

File 0260/15525/15526 PRD-80/58, Interim Report, Incor-rectly Ordered Throttling Valve AECM-80/253 On September 12, 1980, Mississippi Power & Light Company noti-fled Mr. M. Hunt of your office of a Potentially Reportable Defi-ciency (PRD) at the Grand Gulf Nuclear Station (GGNS) construction site. The deficiency concerns incorrectly ordered throttling valves for the Residual Heat Removal (RHR) System.

We have determined that this matter is reportable under 10CFR 50.55(e). We are working with the constructor to investigate this matter for reportability under 10CFR21. Our Interim Report is at tached. We expect to complete our investigation and send you a

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Final Report on this matter by January 21, 1981.

Yours truly, J. P. McGaughy, Jr.

WDH:mt Attachment cc: Mr. N. L. Stampley Mr. Victor Stello, Director Mr. R. B. McGehee Division of Inspection & Enforcement Mr. T. B. Conner U. S. Nuclear Regulatory Co= mission Washington, D.C. 20555 1

Member Middle South Utilities System

4 INTERIM REPORT FOR PP3-80/58 1

1. Description Valves for the Low Pressure Core Spray (LPCS) System and the Resi-dual Heat Removal (RHR) System were incorrectly purchased as shut-i off type valves. However, these valves must operate as throttling valves in order for them to perform their normal operational safety functions.

II. Proposed Resolution of the Deficiency Mississippi Power & Light Co=pany is working with the constructor to resolve this deficiency and to determine reportability under 10CFR21. The following steps are being taken in this investiga-tion:

1.__ Determine _whether the ordered valves can operate in the throt-tling mode to perform their intended safety functions;

2. Evaluate the effect of this condition on plant operations;

3. -Determine action to preclude recurrence; and

4. Implement corrective action.

Ill. Status of Proposed Resolution It .has been determined that valve Q1E21F012 in the LPCS System is not suitable for functioning as a throttling valve. Our in-vestigation revealed that extensive throttling of the valve could result in valve damage to the extent that the valve could not close. This condition would compromise the action of the LPCS System during a safe shutdown. For this reason, we have deter-t mined that this deficiency is reportable under 10CFR50.55(e).

Four other valves in the RHR System are being investigated to determine if they can function satisfactorily as throttling valves.

We have contacted the supplier and requested additional informa-tion to fully evaluate this condition. These actions are being tracked by Bechtel MCAR No. 99.

IV. Reason for Delav in Final Report i

The evaluation is not complete.

V. Final Report Date

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We expect to file our Final, Report by January 21, 1981.

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