ML19341C579

Status Rept 1 for Potential Deficiency Re Yarway Motor Operated Valve Chatter,Initially Reported 810127.Final Rept Projected for Submission by 811118 Subj to Completion of Evaluation of Vendor & Constructor Final Responses

ML19341C579
Person / Time
Site:	Grand Gulf
Issue date:	02/19/1981
From:	Mccaughy J MINNESOTA POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
10CFR-050.55E, 10CFR-50.55E, AECM-81-74, NUDOCS 8103030774
Download: ML19341C579 (3)

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/ '. MISSISSIPPI POWER & LIGHT COMPANY 4 Helping Build Alississippi P. O. 8 0 X 16 4 0, J A C K S O N , MISSISSIPPI 3 9205 j YssfsUr$$Sas7e*adr February 19, 1981 Office of In:tpection & Enf orcement U. S. Nuclear Regulatory Co =nission Regiet 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-81/03, Status Report No. 1, Yarway MOV Valve Chatter AECM-i$1/74 On January 27, 1981, Mississippi Power & Light Company noti-fied Mr. J. Rausch, of your office, of a Potentially Reportable Deficiency (PRD) at the Grand Gulf Nuclear Station (GGNS) con-struction site. This deficiency concerns valve chatter in Yar-way valves. -

Our investigation into reportability under 10CFR50.55(e) and 10CFR21 continues. Attajhed please findjur. Status Report. We ,

expect to determine reportability and submit our final report by November 18, 1981.

Yours truly, fp / J. P. McGaughy, Jr.

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Attachment 9 g cc: See page 2 A O \ Y f 2 ,,e o., $

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810303G7Y Member Middle South Utilities System

MISSISSIPPI POWER & LIGHT COMPANY Mr. J. P. O'Reilly AECM-81/74 NRC Page 2 l cc: Mr. N. L. Stampley Mr. R. B. McGehee Mr. T. B. Conner Mr. Victor Stello, Director Division of Inspection 5 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 me e

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Attachment to AECM-81/74 Page 1 of 1 STATUS REPORT NO. 1 TO PRD-81/03 I. Description of the Deficiency This deficiency concerns certain Yarway, motor operated valves

, in use at CGNS. The problem exists whereby when the valves energized to " closed", a torque switch de-energizes upon full valve closure. The valves then back off the seats which causes re-energizing of the torque switch, which recloses the valve. This repeated cycle causes a " valve chatter" condition.

Systems currently affected are the Residual Heat Removal System (E12). Applicability to Unit 2 is still under investigation.

Investigations into safety implications are currently in pro-gress. The Constructor will work with our NSSS supplier to determine applicability to NSSS systems.

II. Approach to Resolution of the Problem Our approach is to ensure all affected valves are identified and located. Once that is done, proper investigation into impact on safety can be determined and proper corrective actions developed.

III. Status of Proposed Resolution

{ Our investigations into the scope and safety impact continue.

IV. Reason for Delay in Final Report The final report will be made upon completion of evaluations of the constructor's and NSSS vendor's final responses. We currently are not iri'~fec'eipt of' fiiJ1~r~eiiponse from either ~

organization.

V. Projected Completion Date of Final Report We project completion of corrective actions and submission of a final report by November 18, 1981.

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