ML19296B041

LER 80-011/03L-0:on 800115,when Sys Sample Monitoring Pumps Were Removed from Svc,Ventilation Vent Stack B Particulate & Gas Radiation Monitors RM-VG112 & 113 Were Rendered Inoperable.Design Changes Will Add High Range Monitor

ML19296B041
Person / Time
Site:	North Anna
Issue date:	02/15/1980
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19296B040	List: ML19296B039 ML19296B041
References
LER-80-011-03L, LER-80-11-3L, NUDOCS 8002190742
Download: ML19296B041 (2)

Text

NRC FORM 366 U. S. NUCLEAR REGULATORY COMMISSION (717) -

) LICENSEE EVENT REPORT CONTROL BLOCK: l l l l l l l (PLE ASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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/ 8 60 DOCKE T NUYd Eq EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h o 2 i With f rradiated fuel in the spent fuel nit. "B" ventilntinn vant " t , c te n,rtirn1,co ,na l lo l3 l gas radiation monitors RM-VG112 and RM-VG113 respectively were rendered innnernhin I o 4 l when the system sample monitoring piimps were removed from service. sinen or,h < ,ent n e I o s were taken and analyzed for gross radioactivity every 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> while the mnnienrino I

] Ole l l system was inoperable, the health and safety of the cenorni nnblica uora nne ,ffnctua l l O 17 l l This event is contrary to T.S. 3. 3. 3.1 and reoortable niirsn a n t en T_9. 6 o_1 0_h- l 0 8 I 80 7 8 9 SYSTEM CAUSE CAUSE COMP. VALV E CODE CODE SU8 CODE COMPONENT CODE SU8 CODE SU8 CODE 7

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44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i O lThe sample monitoring pumps for RM-VG112 and RM-VG113 were renoved fro, se rvi ce for rhol i i l planned implementation of a design change to add a high rance radintinn mnniene en I gij g lthe sample line. Immediate corrective action was to taken daily crab sannies of the 1

[i[3l j"B" ventilation vent stack effluent. Af ter the design chanee was completed . the sn-nlel i 4 l pumps were returned to service and the radiation monitors were tested to verifv oner- l 7 8 9 ability. 80

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ACTIVITY CONTENT RELEASED OF RELE ASE AMOUNT OF ACTIVITY LOCATION OF RELEASE liisI8LZ 7 9 _ l @ zl@ to 11 NA 44 l l 45 NA 80 l

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Virginia Electric and Power Company North Anna Power Station, Unit #1

Attachment:

Page 1 of 1 Docket No. 50-338 Report No. LER 80-11/03L-0 Description of Event On January 15, 1980, with irradiated fuel in the storage pool, "B" ventilation vent stack particulate and gas radiation monitors RM-VG112 and RM-VG113 were rendered inoperable when the system sample monitoring pumps were secured and removed from service. This event is contrary to T.S. 3. 3.3.1 and reportable pursuant to T.S. 6. 9 .1. 9 . b .

Probable Consequences of Occurrence The consequences of this event were limited because grab samples were taken s..d analyzed every 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> while the "B" ventilation vent stack radiation monitoring system was inoperable and no fuel handling was in progress.

Because all requirements of the Technical Specifications were met, the health and safety of the general public were not af fected. There are no generic implications associated with this occurrence.

Cause of Event The sample monitoring pumps for RM-VG112 and RM-VG113 were removed from service for the scheduled implementation of design change DC-79-66 which added a high range effluent radiation monitor to the vent stack sample line.

Immediate Corrective Action Daily grab samples of "B" ventilation vent stack effluent were taken by Health Physice and analyzed for gross radioactivity. After the design change was completed, the sample pumps were returned to service and the radiation monitors were tested to verify operability.

Scheduled Corrective Action No scheduled corrective action is required.

Actions Taken to Prevent Recurrence No further actions are required.