05000416/LER-1983-122, Updated LER 83-122/01X-1:on 830908,valve P64F467 Which Supplies Operating Pressure to CO2 Fire Protection Master Selector Valve Found Closed.Cause Unknown.Valve Now Locked open.W/840321 Ltr

Updated LER 83-122/01X-1:on 830908,valve P64F467 Which Supplies Operating Pressure to CO2 Fire Protection Master Selector Valve Found Closed.Cause Unknown.Valve Now Locked open.W/840321 Ltr

ML20087M531
Person / Time
Site:	Grand Gulf
Issue date:	03/21/1984
From:	Byrd R, Dale L MISSISSIPPI POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
AECM-84-0172, AECM-84-172, LER-83-122-01X, LER-83-122-1X, NUDOCS 8403300027
Download: ML20087M531 (4)

LER-2083-122, Updated LER 83-122/01X-1:on 830908,valve P64F467 Which Supplies Operating Pressure to CO2 Fire Protection Master Selector Valve Found Closed.Cause Unknown.Valve Now Locked open.W/840321 Ltr

Event date:
Report date:
4162083122R00 - NRC Website

text

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.M lun Emntember R. 1983. an enaratne dimenversid valve PA4F467 closed. The 1 0 3 tvalve supplies operatino crassure to the CO2 fire protection master _j

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• Page 2 of 2 Supplementary Information to LER 83-122/01 X-1 Mississippi Power & Light Company Grand Gulf Nuclear Station - Unit 1 Docket No. 50-416 Technical Specification Involved: 3.7.6.3 Reported Under Technical Specification: 6.9.1.12.b Event Narrative:

This is an update to a previous report submitted on September 20, 1983. The event for which the report was submitted is described in the following paragraphs.

On September 8, 1983, during preparation to repair a C09leak downstream of valve P64F467, the valve was found already closed. The valve must be open to supply operating pressure to the CO2 fire protection master selector valve. The master selector valve IF373) is required to be operable for the CO t discharge from the tank to the main hrader. The 2

closed valve isolated all CO fire Protection. The valve was reopened 2

after discovery.

The valve was inadvertently closed. It could not been determined who closed the valve or.why it was closed. The maintenance work authoriza-tion to repair the leak was initiated on August 5,1983. The mechanic surveying the job scope around August 7 noted the leak was still present (valve was open). In addition, it is known that the valve was open on August 16 when a fuse supplying the master selector valve blew causing C09 to discharge into the main header. Therefore, the valve was apparently closed sometime between August 16 and September 8,1983.

Further investigation revealed that the present piping and instrumenta-tion drawings did not reflect the correlation between valve F467 and the selector valve, F373. However, a design change (DCR 83-394) had been requested to show the valve locked open and to reflect the as built condition. Also, the System Operating Instruction (04-1-01-P64-3) and the Valve Lineup Verification Surveillance (06-0P-SP64-M-0011) did not include valve F467 in the valve lineups. The system was reviewed for similar deficiencies which could cause isolation. None were found.

The procedures were revised to require the valve to be locked open. All outstanding design changes which were initiated to reflect the as-built condition of the plant have been reviewed for their affect on system operating instructions. Affected instructions were revised accordingly.

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P MISSISSIPPI POWER & LIGHT COMPANY Helping Build Mississippi P. O. B OX 1640, J AC K S ON, MIS SIS SIP PI 3 9 2 05 34 MAR 26 A10  : Il 21,1984 Marc NUCLEAR PRODUCTION DEPARTMENT U.S. Nuclear Regulatory Commission Region II 101 Marietta St., N.W., Suite 2900 Atlanta, Georgia 30303 Attention: Mr. J. P. O'Reilly, Regional Administrator

SUBJECT:

Grand Gulf Nuclear Station Unit 1 Docket No. 50-416 License No. NPF-13 File: 0260/L-835.0 Update Report - C09 Fire Protection System Inoperable LER 83-122/01 X-1 AECM-84/0172 This letter subnits an update to a previous report submitted on September 20, 1983. The event for which the report was submitted occurred on September 8, 1983, when an operator discovered the valve which supplies operating pressure to the CO fire Protection master selector valve closed.

2 The selector valve cust be operable to allow CO to discharge from the tank to 2

the main header. The closed valve isolated the CO fire Protection system 2

which is required to be operable by Technical Specification 3.7.6.3. This was reported pursuant to Technical Specification 6.9.1.12.b.

Corrective action for the above event is complete. This is a final report. Attached is LER 83-122/01 X-1 with Supplementary Information.

Yours truly, L. F. Dale Manager of Nuclear Services EBS/SHH:rg Attachment cc: See next page 1

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OWICIAL COPY 1

1 Member Middle South Utilities System I

AECM-84/0172

• MISSISSIPPI POWER Q Ll2HT COMPANY *E#

cc: Mr. J. B. Richard (w/a)

Mr. R. B. McGehee (w/o)

Mr. T. B. Conner (w/o)

Mr.'G. B. Taylor (w/o)

Mr. Richard C. DeYoung, Director (w/a)

Office of Inspection & Enforcement

U. S. Nuclear Regulatory Commission Washington, D. C. 20555 Document Control Desk (w/a)

U. S. Nuclear Regulatory Commission Washington, D. C. 20555 8

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