05000325/LER-1980-033-03, /03L-0:on 800526,while Performing Penetrant Test 1.10,count Rate for Source Range Monitors B & C Did Not Decrease When Detectors Were Removed from Core.Caused by Blown Fuses & Height Discriminator Maladjustment

/03L-0:on 800526,while Performing Penetrant Test 1.10,count Rate for Source Range Monitors B & C Did Not Decrease When Detectors Were Removed from Core.Caused by Blown Fuses & Height Discriminator Maladjustment

ML19318C482
Person / Time
Site:	Brunswick
Issue date:	06/24/1980
From:	Tollison A CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19318C477	List: 05000325/LER-1980-033, Forwards LER 80-033/03L-0 05000325/LER-1980-033-03, /03L-0:on 800526,while Performing Penetrant Test 1.10,count Rate for Source Range Monitors B & C Did Not Decrease When Detectors Were Removed from Core.Caused by Blown Fuses & Height Discriminator Maladjustment
References
LER-80-033-03L-01, LER-80-33-3L-1, NUDOCS 8007010521
Download: ML19318C482 (2)

LER-1980-033, /03L-0:on 800526,while Performing Penetrant Test 1.10,count Rate for Source Range Monitors B & C Did Not Decrease When Detectors Were Removed from Core.Caused by Blown Fuses & Height Discriminator Maladjustment

Event date:
Report date:
3251980033R03 - NRC Website

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60 El DOCKET NUMSER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PRO 8A8LE CONSEQUENCES h o 2 l While performing PT 1.10, IRM and SRM Dete'etor Position Rod Block Test. the count I

g l rate for SRM's B and C did not decrease when the detectors were removed from the core.1 l This event did not affect the health or safety.cf the public.

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36 36 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h g l The fuses on.the drive mechanism for SRM B were fottnd blown and the pulse height l

g ; diveriminator on SRM C was found out of adjustment. The fuses for SRM B were replacedL

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LER AITACEMENT - RO #1-80-33 Facility: BSEP Unit No. 1 Event Date: May 26, 1980 The fuses on the drive mechanism for SRM B were found blown because the mechanism had become jammed on the undercore platform while withdrawing. The fuses were replaced, the mechanism inspected and raised, and the undercore platform aligned its correct position. Several IRMs and SRMs have been damaged during this outage as well as past outages due.to withdrawing the detectors when the platform-is not correctly positioned. An Engineering Work Request has been initiated request-ing that an interlock between the platform and the withdrawing of IRMs and SKMs be installed.

The pulse height discriminator on SRM C was found to be out of adjustment. A functional check on the SRMs is performed weekly during refueling and prior to any startup. As this is the first occurrence of this nature, this is considered

~an isolated event and no further action is required.

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