ML20010B026

LER 81-113/03L-0:on 810706,main Steampressure Transmitter Inadvertently Isolated Resulting in Channel Being Declared Inoperable.Caused by Misunderstanding in Telcon Re Instruments Needing to Be Isolated

ML20010B026
Person / Time
Site:	McGuire
Issue date:	08/05/1981
From:	Nardoci P DUKE POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20010B023	List: ML20010B022 ML20010B026
References
LER-81-113-03L, LER-81-113-3L, NUDOCS 8108130227
Download: ML20010B026 (1)

Text

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, 0 l 7l 0l 6 l 8 l1 Jgl 0 l 8 l0 l 5 l 8 l 1lg 7 8 DCCKEr muustn es 69 EvtMr QATE le 75 ateCar DATE So EVENT CESCRIPTION ANO PACSA8LE CONSEQUENCES h F6TT1 IWhile Mode 3, during a check of pressure gauges suspected of not being properly, m l isolated, a main steam pressure transmitter was inadvertantly isolated resultiy o 4 lin the channel being declared inoperable. This violates T.S.3.3.2 which is l fTTTl Ireportable per T.S.6.9.1.13 (b) . Since the low steam line pressure safety in g lotoiliection trip was blocked, the isolation of one channel of steam generator "D" ,

a 7 Imain steam line pressure had no effect on the safe operation of the plant or tip t o te i lhealth and safety of the public.

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m lThe error was caused by a misunderstanding in a phone conversation about which, 8 linstruments needed to be isolated. The affected channel of the main steam safqty m l njection i trip logic was placed in the tripped position, and the transmitter rg-L'_LD l turned to service. A procedure wac devised to prevent similar misunderstandingy ,

7 i 4 1in the future, and personnel involved were cautioned to be more careful in traips-s , ACILtTVsmitting information. utrHCOC, STAfb$  % -QWW G M QTHfRSTATuS Os5CCvtRY elSCOvtav OEscas, Tion

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