05000285/LER-1980-005-03, /03L-0:on 800131,during Containment Integrated Leak Rate Test,Release to Atmosphere Occurred.Caused by Failure of Rupture Disk.Containment Pressure Monitored for Remainder of Test

/03L-0:on 800131,during Containment Integrated Leak Rate Test,Release to Atmosphere Occurred.Caused by Failure of Rupture Disk.Containment Pressure Monitored for Remainder of Test

ML19290E220
Person / Time
Site:	Fort Calhoun
Issue date:	02/25/1980
From:	Richard A OMAHA PUBLIC POWER DISTRICT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19290E219	List: 05000285/LER-1980-005, Forwards LER 80-005/03L-0 05000285/LER-1980-005-03, /03L-0:on 800131,during Containment Integrated Leak Rate Test,Release to Atmosphere Occurred.Caused by Failure of Rupture Disk.Containment Pressure Monitored for Remainder of Test
References
LER-80-005-03L, LER-80-5-3L, NUDOCS 8003050486
Download: ML19290E220 (4)

LER-1980-005, /03L-0:on 800131,during Containment Integrated Leak Rate Test,Release to Atmosphere Occurred.Caused by Failure of Rupture Disk.Containment Pressure Monitored for Remainder of Test

Event date:
Report date:
2851980005R03 - NRC Website

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EVENT DESCRIPTION AND PRCS A3LE CONSECUENCES h o

l An inadrenent radicactite gas release

• the atrosrhere occ r -ei due c 'silure l

o13 l cf the rupture disk used to protect the reactor contai=ent frce c'rerrressuricatic-'

l o ia i during the Contai=ent Integrated Leak Rate Test (!LET).

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s i Technical Specification Limits.

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CAUSE

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CAUSE DESCRIPTION AND CCARECTIVE ACTICNS i

o l The release was caused by the failure of the nrture disk vnen the centairent cras-1 l.sure was stabilized at approx. 61.5 psig. The disk vas desi ne<1 to rurture e G *si t.

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l The release was terminated by closing a =anual isolation va've between the centa -a-t 3

l penetratica and the rupture disk. For the remainder of the I'.ET, centainment er_essurb t

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3 9 Lc Open is 3nctilC the Contain en* pressure rise uneXpecte'il7 3J YETHOD OF F ACILITY 30 STATUS

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8 3 to 12 11 44 45 46 80 ACTIVITY CON TENT RELEASED OF RELEASE AMOUNT CF ACTivlTY LOCATION 05 RELEASE

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r__r,. 80-05 Cnaha Public Pcver District Fort Calheun StationUnit "c.1 Docket "c.

05000235 Attachment :!c. 1

Safety Analysis

A rupture disk is installed in the pressurication piping fer the Con-tain=ent Integrated leak Rate Test to protect the centainment frc being over-pressuriced.

The rupture disk discharge piping is connected to the auxiliary building ventilation system. Stack ficy rate strip chert records show that the release caused by failure of the rupture disk lasted for only three =inutes before the line was manually isolated.

There was no noticeable increase in count rate en the Gasecus Stack Effluent Radiation Meniters (EM-C62) reccrd during that period.

The tctal arount of activity released has been calculated to te 25h8 curies.

The maxinu calculated release rate of gross gaseous activity was lh.15 pCi/sec., ihich is less than the T.echnical Specification 2.9(2) linit of 33,000 pCi/sec. release rate of gasecus activity excluding halogens and particulates with half lives greater than 3 lays.

The Xe-133 concentration at the site bcundary asing the annual average dispersion factor frc the Technical Specificatiens has been calculaced te be 3.2912-10 uCi/ce. This is 0.115 of the unrestricted area -a e' u: permissible concentration, 3.CE-T pCi/ce, as stated in 10CFR part 20.

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LIR 80-05 Onaha Public ?cver District Fort Calhoun Station Unit :!c.1 Decket :To. 05000235 Attachnent :*o. 2

Corrective Action

To prevent further recurrences, an investigati:n is being conducted to determine if the rupcure disk pressure specification should be increased.

Replacing the rupture disk before each test is also being considered.

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s LER 80-05 Csaha Public Power Distric Fort Calhoun Station Unit :To.1 Cocket :!c. 05000285 Attachment Ilo. 3 Failure Data This is the first event at Fort Calhoun which has resulted in a gas release due to a rupture disk failure.

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