ML20009C079

Forwards LER 81-040/03L-0.Detailed Event Analysis Encl

ML20009C079
Person / Time
Site:	McGuire
Issue date:	05/05/1981
From:	Parker W DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20009C080	List: ML20009C079 ML20009C081
References
NUDOCS 8107200248
Download: ML20009C079 (3)

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'\ BM Vier PRESaDENT TELEPwCNE; AREA 704 STEau Pacouctiom May 5, 1981 3 7 3-4e 8 3 14 66 /7. sgb Mr. James P. O'Reilly, Director 93

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U. S. Nuclear Regulatory Cormnission q, I

Region II [,

• 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303 d[ [ *) -) <3

.' JUL l 'T 1981 *- T Re: McGuire Nuclear Station Unit 1 g u = cam.asumamus '4 Docket No. 50-369 "

Dear Mr. O'Reilly:

h i' Please find attached Reportable Occurrence Report R0-369/81-40. This report concerns Channel I of Negative Steam Line Pressure Rate for Steam Generator

'A' and Channel III for Steam Generator 'D' being declared inoperable. This incident was considered to be of no significance with respect to the health and safety of the public.

Very truly yours, m M , An William O. Parker, Jr.

RWO:p Attachment l

cc: Director Mr. Bill Lavallee Office of Maragement & Program Analysis Nuclear Safety Analysis Center U.S. Nuclear Aagulatory Commission P. O. Box 10412 Washington, D. C. 20555 Palo Alto, CA 94303 4 H

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8107200248 810505 PDR ADOCK 05000369 S PDR

McGUIRE NUCLEAR STATIGP INCIDENT REPORT Report Number: 81-40 Report Date: April 14, 1981 Occurrence Date: April 5, 1981 Facility: McGuire Unit 1, Cornelius, N. C.

Identification of Occurrence: Channel I of Negative Steam Line Pressure Rate for Steam Generator 'A' and Channel III on Steam Generator 'D' de-clared inoperable.

Conditions Prior to Occurrence: Mode 4, Hot Shutdown.

Description of Occurrence: On April 5, 1981 at 0950 hours0.011 days <br />0.264 hours <br />0.00157 weeks <br />3.61475e-4 months <br />, the Shift Supervisor discovered that the pressure gauges for S/G 'A' Steam Line Pressure Channel I and S/G 'D' Steam Line Pressure Channel III were in-dicating some pressure with no pressure in the steam lines. Both channels were declared inoperable. This incident was therefore reportable pursuant tc Technical Specification 3.3.2.

Apparent Cause of 0ccurrence: The two pressure gauges were not indicating properly'because their respective transmitters (VERITRAC 59PMI) were bad.

One transmitter was out of linearity and could not be cal:.brated and the bellows of the other transmitter was ruptured.

Analysis of Occurrence: Before going to Mode 4 on April 4, 1981, personnel were performing a periodic test on S/G 'A' Steam Line Pressure Channel I and S/G 'D' Steam Line Pressure Channel III as required by the PM/PT Program.

During this time, they discovered that the transmitters were bad but they could not be replaced since there were no spare transmitters in stock. The Supervisor in charge had previously initiated a purchase requisition to transfer all similar transmitters from Unit 2 to Unit 1 to be used as spares.

However, as a Shutdown Request r.equirement, the Unit 2 transmitters could not be removed and transferred to Unit i until their replacements were available.

After going to Mode 4, the Supervisor was able to finally obtain the two transmitters from Unit 2 and the bad Unit 1 transmitters were replaced on April 9, 1981.

Safety Analysis: While the plant was at Mode 4, the Residual Heat Removal System (ND) continued to serve as the heat sink. Since the steam generators were not used, the significance of the S/G Steam Line Pressure Instrumen-tation being inoperable had no affect on the plant's safe operation. More-over, the health and safety of the public were not affected. If the S/G's had been operating, 2 out of 3 channels would be required in any steam line for main steam line isolation to occur.

.-.,. - - .- L . -

e Report Number 81-40 '

Page 2 Corrective Action: The Shift Supervisor requested personnel to place the affected channels in the trip position insnediately upon declaring them in-operable. (This is done by placing the loor., in the TEST position.) The transmitters were replaced, tested, and calibrated and both channels were declared operable on April 9, 1981 at 1145 hours0.0133 days <br />0.318 hours <br />0.00189 weeks <br />4.356725e-4 months <br />.

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