ML19208A518

LER 79-025/03L-0:on 790810,while Replacing 480-volt Load Ctr Transformer Supplying Vital Bus 22E,power Operated Relief Valves Forced to Become Inoperable.Caused by Replacement of Load Ctr Transformers

ML19208A518
Person / Time
Site:	Millstone
Issue date:	09/07/1979
From:	Harris J NORTHEAST UTILITIES
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19208A515	List: ML19208A514 ML19208A518
References
LER-79-025-03L, LER-79-25-3L, NUDOCS 7909140446
Download: ML19208A518 (1)

Text

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(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) to i 8 9 l c l T t ri lrt is l2 Igl0 14 iS 10 l - 10LICENSE 0l0 NLMBER o l- 10 l0 l 025lg[ 4l 1 l 111 l 1 lgl l ig LICEr.sEE CODE 2b LBCENSE TveE .11 51 CA r 53 CON'T o 1 s",nN l Ll@ 01 5 010 l 0 l 3 l 1 6 l@l 01 All In l7 lo 74@l Ol 910 l 7 l 719 l@

8 60 61 OOCN ET NUM9 ER 68 69 EVE NT DATE - 75 REPORT OATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES o 2 l Ilhile replacing the 480V load center transformer sunolvina vital bus 22E (and later l

o ;3 l to vital bus 22F) it was necessary to declare inoperable on'e of two power operated I o .

l relief valves (PORV). The plant was operated in accordance with the action statement I

ois l of technical specification 3.4.9.3.a for both cases. l

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44 4F CAUSE DESCRIPTION AND CORRECTIVE ACTIONS it oj l Replacement of the load center transformer for vital bus 22E renuired PORV 2-RC-402 I g i I to be disabled to prevent it from ooening with bus 22E de-enercized. Uoon restorino I

,, , I bus 22E and the PORV to operable status on 8/11/79, transformer replacement for bus I i ,

3 l 22F required PORV 2-RC-404 to be inoperable during the period 8/15 - 8/17/79. I ii 4 I I 8 9 80 ST U3 N P O".E R OTHER STATUS bl CO RV OLSCOVERY D ESCR'* TION ii s Gl@ l 0 l 0 l 0 l@ flA l l A l@l Operator Observation l ACTIVITY CONTENT RELEASED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE i s t1A flA

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68 69 i i i i rririiirli 83-2 J. S. Harris 203-447-1791 o NAME OF PREPARER PHONE: *

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