ML19210D589

LER 79-047/01T-0:on 791110,discovered Air Leak Into Containment.Caused by Inadequate Procedures for Monitor Access Cover Replacement.Procedures Will Be Revised & Affected Personnel Will Review Revision

ML19210D589
Person / Time
Site:	Beaver Valley
Issue date:	11/21/1979
From:	Werling J DUQUESNE LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19210D588	List: ML19210D587 ML19210D589
References
LER-79-047-01T, LER-79-47-1T, NUDOCS 7911270354
Download: ML19210D589 (2)

Text

NRC FORM 366 ,

U. S. NUCLEAR REGULATORY COMMISSION (7 77)

LICENSEE EVENT REPORT CONTROL BLOCK: l i

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(PLEASE PRINT OR TYPE ALL REOUIRED lNFORMATION) 7 o i 8 9 P l ALiCENdEE l 3 l CGCE V l S l 1 l@l le 15 0 l 0 l- l 0 luCE 0 10 l 0 l 0 l- l 0 l 0 25l@l 264 nE w VdER 1LICENSE l1 l1TYPE l1 Nl@l47 CAT l ba lh CON'T REPORT o

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8 3g 9e l60L @l 0 5 l 0el l 0 l 0 l 3 l 3 l W4 @l COCKET NUYBER 63 1l1 l 1 l 017 l 91@l EVENT DATE 74 75 1 IREPORT I l 2 QATE l 1l 71 9l@ 80 EVENT DESCRIPTION AND PRO 8 ABLE CONSEQUENCES h o 21 l A review of plant lons suenested an air leak into containment. An inspection of the]

o 3 l containment vacuum and radiation monitoring systems disclosed that the sample flow l o a 1throuch the containment particulate and easeous radiation monitors did not chance I o s Iwhen the inlet valve was shut. At 1100 hours0.0127 days <br />0.306 hours <br />0.00182 weeks <br />4.1855e-4 months <br />, the particulate monitor was bvoassed I O 6 land the caseous monitor count rate increased to recister containment activitv. At I o 7 l 1111 hours0.0129 days <br />0.309 hours <br />0.00184 weeks <br />4.227355e-4 months <br />, the caseous monitor was declared e3erable. The particulate monitor I o a Iremained isolated and a erab sample was taken ner technical snecific tions. I 7 8 9 80 SYSTEM CAUSE CAUSE COMP. VA L% E CODE CODE SUSCCDE COMPONENT CODE SUSCODE SUSCODE 7

O 9 8 9 l Cl Ilh lD lh l Zlh l Il Nl Sl Tl Rl Ulh l Xlh lZ lh to 11 12 13 la 19 20

,_ SEOUENTI AL OCCURRENCE REPORT REVISION LE R EVENT YEA R R EPORT NO. CODE TYPE NO.

O ag/ROsu ,a; 1719i l- 1 01 cl 71 1/l I 01 11 l Tl I-l 10l

_ 21 22 23 24 26 27 28 23 30 31 32 T K N AC O ON PL NT VET HOURS S S i FO b B. SUPPLIER MANUFACTURER lCl@lHl@

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35 l36 Z lh 3l7 0l0l0l0l40 [ h el lNlh lAlh 42 43 44 Yl1l1l5l@ 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i o ]The incident resulted from inadequate procedures for replacement of the particulate l g imonitor access cover. The improperly installed cover allowed air to be suebed into 1 i 2 l containment. Procedures will be revised to address the correct method for cover I i 3 l installation. All affected personnel will review the revision. The particulate i 4 l monitor was returned to service at 1420 hours0.0164 days <br />0.394 hours <br />0.00235 weeks <br />5.4031e-4 months <br />. l 7 8 9 80 ST 4 POWER OTHER STATUS 15 0 R OlSCOVERY DESCRIPTION 1 5 l Elh l 0 l 3 l 7 l@l N/A l lAl@lOperatorobservation l 7 8 9 1 12 11 44 45 46 . 80 RELEASED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE 1 6

@ l10Zl l N/A l l N/A l 7 8 3 11 44 45 80 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION

• i I7' 'l0l0l0l@lZl@l  :

N/A i

P ER$ ANN A'im'R, E S NuesER oESCniPTicNh i a 1010101@l N/A l 7 8 ) 11 12 20 LOSS 7PE OF On CAVAGE J E';CRIP rioN TO FACILITY Q v

i 9 d 9 Z l 13 N/A 110h - -

l 7 h 30 DESCRIPTION

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'!3UE INi D@l N/A l lIIIllll l1ll l5 7 8 J 10 68 69 53 ;

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NAME OF PREPARER -

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Attachment To LER 79-47/0lT Beaver Valley Power Station Duquesne Light Company Docket No. 50-334 A review of the plant operator's logs and the operating history of the containment vacuum pumps suggested an air leak into containment. A careful inspection of the Containment Vacuum and Radiation Monitoring Systems was perf o rmed. It was discovered that the sample flow through the containment particulate and gaseous radiation monitors did not change when the inlet valve was shut. At 1100 hours0.0127 days <br />0.306 hours <br />0.00182 weeks <br />4.1855e-4 months <br />, the particulate monitor was bypassed and isolated and the gaseous monitor count rate increased to register containment atmosphere activity. At 111?. hours, the containment gaseous monitor was declared operable.

The particulate monitor remained isolated and a grab sample was obtained to comply with Technical Specifications. The particulate monitor leak was repaired and the monitor was returned to servicesat 1420 hours0.0164 days <br />0.394 hours <br />0.00235 weeks <br />5.4031e-4 months <br />.

The particulate monitor leak was the result of an improperly installed monitor access cover. Procedures were inadequate to specify correct replacement of the cover. Radiation control procedures and maintenance pracedures will be revised to address the correct method for cover installation. Training will be conducted for maintenance and radcon personnel to demonstrate correct cover replacement.

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