ML19263C979

LER 79-004/03L-0 on 790214:during Routine Calibr of Torus Level Transmitter Lt 16-19-38A,instrument Could Not Be Calibr to Limits Specified.Caused by Buildup of Rust & Crud in Transmitter Capsule Cavity.Transmitter Was Replaced

ML19263C979
Person / Time
Site:	Vermont Yankee File:NorthStar Vermont Yankee icon.png
Issue date:	03/16/1979
From:	Conway W VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19263C973	List: ML19263C972 ML19263C979
References
LER-79-004-03L, LER-79-4-3L, NUDOCS 7903200391
Download: ML19263C979 (2)

Text

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11 12 13 18 19 20 SEOUENTI AL OCCURRENCE REPORT REVISION REPORT NO. CODE TYPE NO. LER HO _ EVENT YE AR O ,n E,gR l7 9] l_j l0 j0 4l l/] l 0l 3 [ 30 Ll l_l 31 l0l 32 _.41 22 23 24 26 27 28 29 ON PL A T T4 HOUHS S B IT FOR b B. SUPPLIE MAN FACTURER TAKE A TC lJ5Z l@ Zl@ l 0l 0l 0l 0l40 lYl@ l42Y l@ l43Nl@ l Gl 0 8 l 0 [@ J3 C l@l34 Z @ 36 3/ 41 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS I i o l i Ii l1 Ii see attached sheet 1 7 l 1 3 l I 11 1411 80 7 8 9

                                      ' .POWER                         OTHER STATUS                 IS O FY                            DISCOVERY DESCRIPTION ST      S i   5 El@ l1 l 0 0l@l                                 NA                        l    l B l@l Quarterly Calibration Test                                            l A TIVITY        CO TENT RELEASED OF RE LE ASE                           AMOUNT OF ACTivtTY                                                    LOCATION OF RELEASE NA                                                               l 7

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VTVYS1 05000271 LER 79-4/3L EVENT DESCRIPTION AND PROBABLE CONSEOUENCES During routine calibration of the torus level trausmitter LT 16-19-38A, it was determined that the instrument could not be calibrated to the speci-fied limits of Tech. Spec. Table 3.2.1. The EPCI System was declared in-operable and alternate testing in accordance with Tech. Spec. 3.5.E.2 was initiated. Within approximately 4 hours from the time of discovery, the trans-mitter was returned to ser/ ice and alternate testing was secured. Based on the fact that the redundant torus water level instrumenta-tion channel was operable, it was concluded that there were no adverse consequences to the public health or safety as a result of this event. There were no previous reportable occurrences of this type. CAUSE DESCRIPTION AND CORRECTIVE ACTION The apparent cause of this event appears to be an accumulation of rust and crud buildup in the transmitter capsule cavity. Corrective action was to replace the transmitter with a spare of like kind.}}