ML19350E631

Interim Deficiency Rept 2 Re Bettis Spring Return Actuators, Initially Submitted on 801222.Five Bettis Actuators Installed on Henry Pratt Valves at Facility.Final Rept Will Be Submitted by 810915

ML19350E631
Person / Time
Site:	Grand Gulf
Issue date:	06/16/1981
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-81-197, NUDOCS 8106230375
Download: ML19350E631 (5)

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. l-MISSISSIPPI POWER &' LIGHT COMPANY Helping Build Mississippi P. O. B O X 1640, J AC K S O N, MIS SIS SIP PI 39 205 NUCLEAR PRODUCTloN DEPARTMENT June 16, 1981 Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Region 11 101 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-80/72, Interim Report No. 2 Bettis Spring Return Actuators AECM-81/197

. On December 22, 1980, Mississippi Power & Light Company notified Mr. P.

K. Van Dcorn, of your of fice, of a Potentially Reportable Deficiency (PRD) at the Grand Gulf Nuclear Station (GGNS) construction site. The deficiency con-cerns the spring guide sleeve shifting internally on safety related actuators supplied by GH-Bettis to valve manufacturers.

Presently, we have identified five (5) of these actuators inatalled on -

Henry Pratt valves at GGNS. .We are currently working with our Constructor and l NSSS supplier to determine if there are any more deficient actuators installed on valves supplied by different manufacturers.

On November 18, 1980, GH-Bettis reported this deficiency under the pro- l visions of 10CFR21. Working with our Constructor, we have determined that this deficiency is reportable by us under 10CFR50.55(e).

Attached is our interim report to PRD-80/72. We expect to file our final report on this matter by September 15, 1981.

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

KDS:dr g ATTACHMENT cc: See page 2  ![

81062303-(6 Member Middie Souen utilities System S

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Mr. J. P.' 0'Reilly AECM-81/197 NRC Page 2 cc: Mr. N. L. Stampley Mr. R. B. McGehee Mr.'T. B. Conner Mr. Victor Stallo, Director .

Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Washington, D.C. 20555 Mr. G. B. Taylor -

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South Miss. Electric Power Association P. O. Box 1589 Ilattiesburg, MS 19401 e

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4 bec: Dr. D. C. Gibbs Mr. D. C.-Lucken Mr. J. N. Ward-Mr. W. A. Braun -

Mr. R. Trickovic Mr. J. W. Yelverton Mr. L. F. Dale Mr. C. K. McCoy Mr. T. R. Cloninger Mr. R. A.'Ambrosino .

Mr. R. C. Fron Mr. G. B. Rogers Mr. M. R. Williams Mr. L. E. Ruhland -

Mr. D. L. Ilunt -

Mr. A. G. Wagner Mr. P. A. Taylor PRD File File O

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L ." ~ s Attachment.co'AECM-81/197-j: o' [ Pag 1 1 cf 2 n ,

L - FINAL REPORT TO PRD-80/72 L .

[ I. Description of the~ Deficiency' GH-Bettis Corporation notified the NRC on November 13, 1980, in accordance i

with 10CFR21,~of,a condition concerning N521C-SR/N522C-SR actuators..Bettis supplies actuators to several valve manufacturers. The condition was ,

' - identified during surveillance testing by the R&D . Laboratory of GH-Bettis Corporation of their 521C-SR actuator, where a defect was discovered which may affect actuators presently installed in safety related service. It was.

' found that the spring guide sleeve shif ting internally could prevent the movement of.the actuator. This failure to actuate can only occur in the normal power stroke, and if the "0" degree position of the valve is actually past the normal "0" of the actuator. The spring stroke of the actuatot', .

which is the normal safety function stroke, is unaffected by this defect.

Model N51C-SR-80 actuators were furnished on Henry Pratt Valves supplied the

. Constructor for GGNS Unit 2.- A total of five (5) of these valves ha've~ been purchased for Combustible Gas Control-(E61) System. .Four of the above.

valves are currently in storage. The fif th valve, MPL Number F007, was returned to Henry Pratt Company for "new loads" testing on March 25, 1980.

Our Constructor has evaluated the identified valves with the defective GB-I-

Bettis actuators on them for ef fect on safety of plant operations and has

, determined that the cited actuators may not allow the valves to pe'rform their intended function'in the event of an accident. Therefore, the condition has been determined to be reportable under 10CFR50.55(e).

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II. Approach to Resolution of the Problem t

The cause of the problem was a design deficiency as reported by GH-Bettis i Corporation to the NRC. The full extent of this condition has not been i determined. - At present five (5) defective actuators have been identified at GGNS. These are mounted *on Henry Pratt valves which function in the con-tainment isolation or containment purge service.within the E-61 System. GH-Bettis has redesigned the actuator and the five (5) identified Grand Gulf actuators are to be repaired in accordance with prescribed procedures furnished by Ga-Bettis. The manufacturer has issued an Engineering Change Notice to preclude recurrence of the problem. )

3 . l III.' Status of Proposed Resolution HP&L is presently working with our Constructor and NSSS supplier to determine if defective actuators have been installed on valves supplied by l manufacturers other than Henry Pratt at GCNS. The field repair cf the five (5) presently identified actuators will be completed by August 15, 1981.

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e Attachment to AECM-81/197

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- IV. Reason Why a Final Report Will be Delayed MP&L-is awaiting information from our Constructor and NSSS supplier concerning utilization of other GH-Bettis actuators at GGNS.

V. Date When Final Report Will be Submitted We expect to file our final report on this deficiency by September 15, 1981.-

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