AECM-85-0142, Part 21 & Second Interim Deficiency Rept RD-85/03 Re MSIV Failure to Remain Closed Due to Failure of Automatic Switch Co Dual Solenoid to Transfer When Deenergized.Initially Reported on 850321.Next Rept by 850630

Part 21 & Second Interim Deficiency Rept RD-85/03 Re MSIV Failure to Remain Closed Due to Failure of Automatic Switch Co Dual Solenoid to Transfer When Deenergized.Initially Reported on 850321.Next Rept by 850630

ML20128D499
Person / Time
Site:	Grand Gulf
Issue date:	04/30/1985
From:	Dale L MISSISSIPPI POWER & LIGHT CO.
To:	Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
REF-PT21-85, REF-PT21-85-257-000 AECM-85-0142, AECM-85-142, PT21-85-257, PT21-85-257-000, RD-85-03, RD-85-3, NUDOCS 8505290095
Download: ML20128D499 (2)

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MISSISSIPPI POWER & LIGHT COMPANY

] Helping Build Mississippi EulMahliddB P. O. B O X 16 4 0, J 39215-1640 35 k..v M {3 P 3 *. $ pCKSON, MISSISSIPPI U

April.30, 1985 NUCLEAR LICENSING & $AFETY DEPARTMENT U. S. Nuclear Regulatory Commission Region II 101 Marietta St., N.W. Suite 2900 Atlanta, Georgia 30323 Attention: Dr. J. Nelson Grace, Regional Administrator

SUBJECT:

Grand Gulf Nuclear Station Unit 1

, Locket No. 50-416 License No. NPF-29 File: 0260/0511/0512 RD-85/03, Interim Report #2, MSIV Failure to Remain in Closed Position Due to Failure of the Dual Solenoid (ASCO) to Transfer When De-energized AECM-85/0142

Reference:

AECM-85/0096 dated March 26, 1985 On March 21, 1985, Mississippi Power & Light Company (MP&L) notified Mr. Vince Panciera of your office of a Reportable Deficiency at Grand Gulf Nuclear Station (GGNS) Unit 1. The deficiency concerns the failure of dual solenoid valves to transfer when de-energized.

This deficiency was determined to be reportable under the provisions of 10CFR21 for Unit 1. Applicability to Unit 2 has not been determined at this time. MP&L's initial 10CFR21 report was provided in the reference letter.

The purpose of this letter is to provide the status of actions taken to date. As noted in interim report #1 (referenced letter), General Electric (CE) and the Automatic Switch Company (ASCO) were in the process of performing additional tests on the HTX solenoid valves to determine the cause and any further corrective actions, if required. This testing has not been completed at this time.

General Electric and ASCO have performed temperature testing of the HTX valves. During these tests, two valves which failed at GGNS were slow in transferring when de-energizing. The valves were disassembled and dimensional checks were perfcrmed. During disassembly small amounts of a foreign substance was found in ths Ives. This foreign substance was removed and sent to a chemical lab for .nfrared spectra analysis (non-metallic contents testing only). The valves were cleaned, reassembled and retested and were found to operate normally.

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-, AECM-85/0142 Pags 2 The valves, foreign substance samples, and ASCO Test Report are being shipped to General Electric in San Jose, California for further analysis. In addition, General Electric has requested MP&L to provide additional HTX series valves of which GE plans.to sample for foreign substances. These samples (from additional' valves and existing test valves) will be subjected to plasma spectra analysis'to determine metallic content.

Based on the above, the cause and corrective action has not been determined at this time. MP&L will provide an update' report by June 30,.1985.

If there are any questions, please advise.

Yours truly,

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L. F. Dale Director EBS/SHH:vog cc: Mr. J. B. Richard Mr. O. D. Kingsley, Jr.

Mr. N.' S. Reynolds-Mr. G. B. Taylor Mr. James.M. Taylor, Director Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Washington, D. C. 20555 J0P13AECM85042903 - 2 L