05000338/LER-1982-017, Updated LER 82-017/03X-1:on 820408,during Full Power, Charcoal Sample Lab Analysis from Process Vent Filter Failed to Meet Testing Criteria.Caused by Natural Depletion of Charcoal.Redundant Filter Installed & Charcoal Replaced

Updated LER 82-017/03X-1:on 820408,during Full Power, Charcoal Sample Lab Analysis from Process Vent Filter Failed to Meet Testing Criteria.Caused by Natural Depletion of Charcoal.Redundant Filter Installed & Charcoal Replaced

ML20053C328
Person / Time
Site:	North Anna
Issue date:	05/19/1982
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20053C325	List: 05000338/LER-1982-017, Updated LER 82-017/03X-1:on 820408,during Full Power, Charcoal Sample Lab Analysis from Process Vent Filter Failed to Meet Testing Criteria.Caused by Natural Depletion of Charcoal.Redundant Filter Installed & Charcoal Replaced
References
LER-82-017-03X, LER-82-17-3X, NUDOCS 8206010671
Download: ML20053C328 (2)

LER-2082-017, Updated LER 82-017/03X-1:on 820408,during Full Power, Charcoal Sample Lab Analysis from Process Vent Filter Failed to Meet Testing Criteria.Caused by Natural Depletion of Charcoal.Redundant Filter Installed & Charcoal Replaced

Event date:
Report date:
3382082017R00 - NRC Website

text

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dPDhTE' REPORT - PREVIOUS REPORT DATE: 5-03-82 U.S. NUCLEAR REGULATORY COMMISSION d LICENSEE EVENT REPORT CONTROL BLOCK / / / / / / / (1) (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

/0/1/ /V/A/N/A/S/1/ (2) /0/0/-/0/0/0/0/0/-/0/0/ (3) /4/1/1/1/1/ (4) / / / (5)

LICENSEE CODE LICENSE NUMBER LICENSE TYPE CAT 0/1/

LL/ (6) /0/5/0/0/0/3/3/8/ (7) /0/4/0/8/8/2/ (8) / 0/ 5/1/ 9/8/ 2/ (9)

DOCKET NUMBER EVENT DATE REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES (10)

/0/2/ /_On April 8, 1982, with Unit No. I at 100% power, a charcoal sample laboratory /

/0/3/ / analysis from the process veat filter did not meet the testing criteria of reg- /

l

/0/4/ / ulatory guide 1.52, Rev. 2. The effluent from the process vent filter is con- / j

/0/5/ / tinuously monitored and did not exceed any release limits; therefore, the health / l

/0/6/ / and safety of the general public were not affected. This is reportable pursuant /

/0/7/ / to T.S. 3.6.4.3 and 6.9.1.9.b. /

/0/8/ /

/

SYSTEM CAUSE CAUSE COMP. VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE

/0/9/ /M/B/ (11) /E/ (12) /F/ (13) /X/X/X/X/X/X/ (14) /Z/ (15) /Z/ (16)

SEQUENTIAL OCCURRENCE REPORT REVISION LER/R0 EVENT YEAR REPORT NO. CODE TYPE NO.

(17) REPORT NUMBER /8/2/ /-/ /0/1/7/ /\/ /0/3/ /X/ /-/ L1/

ACTION FUTURE EFFECT SHUTDOWN ATTACHMENT NPRD-4 PRIME COMP. COMPONENT TAKEN ACTION ON PLANT METHOD HOURS SUBMITTED FORM SUB. SUPPLIER MANUFACTURER LC/ (18) LZ/ (19) LZ/ (20) /Z/ (21) /0/0/0/0/ (22) /Y/ (23) /N/ (24) /A/ (25) /x/9/9/9/ (261 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (27)

/1/0/ / The charcoal contained in the process vent filter system may be subjected to /

/1/1/ / welding and painting fumes during refueling / maintenance outages which tend to /

/1/2/ / shorten the lifetime of the carbon absorber. The charcoal was just naturally /

/1/3/ / depleted. The redundant filter was placed in service and the charcoal was /

/1/4/ / replaced in the depleted filter.

/

FACILITY METHOD OF STATUS  % POWER OTHER STATUS MSCOERY DESCRMION (32)

/1/5/ LE/ (28) /1/0/0/ (29) / NA / (30)DISCOERY

/_B/ (31) / Periodic Surveillance Test /

ACTIVITY CONTENT RELEASED OF RELEASE AMOUNT OF ACTIVITY (35) LOCATION OF RELEASE (36)

/1/6/ LZ/ (33) LZ/ (34) / NA / / NA /

PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION (39)

/1/7/ /0/0/0/ (37) /Z/ (38) / NA /

PERSONNEL INJURIES NUMBER DESCRIPTION (41)

/1/8/ /0/0/0/ (40) / NA

/

LOSS OF OR DAMAGE TO FACILITY TYPE DESCRIPTION *"

/1/9/ /Z/ (42) /

PUBLICITY NA R 2 0 6 01OG 7/ /

ISSUED DESCRIPTION (45) NRC USE ONLY

/2/0/ /N/ (44) /_ NA

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NAM?. OF PREPARER W. R. CARTWRIGHT PHONE (703) 894-5151

e , e se' UPDATE REPORT - Previous Report Date: 5-03-82 Virginia Electric and Power Company North Anna Power Station, Unit No. 1

Attachment:

Page 1 of 1 Docket No. 50-338 Report No. LER 82-017/03X-1 Description of Event On April 8, 1982, with Unit No. I at 100% power, test results were received indicating that the "B" process vent charcoal filter had a methyl iodide penetration in excess of the acceptable limit. The labora-tory analysis indicated a penetration of 6.5% when tested in accordance with regulatory guide 1.52, Rev. 2 and ANSI N510-1976. The maximcm allowable penetration is 5%.

Probable Consequences of Occurrence The redundant charcoal filter was available for use. The effluent of the process vent system is monitored continuously and since the gaseous release limits were not exceeded, the health and safety of the general public were not affected.

Cause of Event The carbon absorber in the process vent filter system is analyzed every 720 hours0.00833 days <br />0.2 hours <br />0.00119 weeks <br />2.7396e-4 months <br /> of filter operation. The process vent system handles gases from many systems; llowever a majority of the through put is dilu-tion air which is drawn from the third floor of the Auxiliary Building.

Welding and painting during the Unit No. 2 Refueling Outage in the Auxiliary Building may have allowed welding and painting fumes to com-municate with the process vent filter. The filter reached the end of its natural lifetime and the carbon sample had a penetration slightly higher than the allowable maximum penetration.

Immediate Corrective Action The inoperable filter was removed from service and the redundant filter was lined up for use. The carbon was replaced in the depleted filter bank and the absorber was tested satisfactorily in accordance with the required surveillance. The replenished filter was then left as the " Standby" filter.

Scheduled Corrective Action No further corrective action is required.

Actions Taken to Prevent Recurrence The existing requirement to sample and anaylze the carbon every 720 hours0.00833 days <br />0.2 hours <br />0.00119 weeks <br />2.7396e-4 months <br /> of filter operation is adequate to prevent severe degradation of the absorber according to present testing history.

{ Generic Implications l-l l There are no generic implications.

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