ML20039F483

LER 81-029/03L-0:on 811130,w/unit at Hot Shutdown,Leak Was Discovered in Chemical & Vol Control Sys.Caused by Failed bonnet-to-body Gasket on Valve CVC-291.Gasket Replaced

ML20039F483
Person / Time
Site:	Robinson
Issue date:	12/30/1981
From:	Cox H CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20039F482	List: ML20039F481 ML20039F483
References
LER-81-029-03L-01, LER-81-29-3L-1, NUDOCS 8201130037
Download: ML20039F483 (2)

Text

NRC FCRM 366 U.S. NUCLEAR REGULATORY COMMISSION (7-77)

• LICENSEE EVENT REPORT

,C CONTROL BLOCK: l l l l l l lh - (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 6 lO l 8t 9l l S lLICENSEE 7

C l 11 l B l R l152 l@l 0 l0 l-LICENSE CODE 14 l 0 l0 l0 l0 l0 l- l0 25l0 l@l4 NUMBER 26 l1 l1 TYPE LICENSE. l1l1l@l JO l

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i CON'T 101il "E' 3UC l60L- l@]61 015 l DOCKET 0 l 0 NUMB l0 lER2 l 6 l168 l@l1 11EVENT 13DATEl0 l811 l@l 74 75 l l l l l 80 l@

7 8 69 REPORT DATE .

EVENT DESCRIPTION AND PROBABLE CONSEQUENCES l o l 2 I lOn November 30, 1981, at approximatel 1330 hours0.0154 days <br />0.369 hours <br />0.0022 weeks <br />5.06065e-4 months <br /> with the unit at hot shutdown l gconditions, a leak was discovered in the Chemical and Volume Control System. The l

,g,3, This g o y 4, l leak source was identified as valve CVC-291 and was isolated at 1356 hours0.0157 days <br />0.377 hours <br />0.00224 weeks <br />5.15958e-4 months <br />. l i g ,3 ; gevent resulted in the abnormal degradation of a system designed to contain radio- l lg gg ; [ active material which is reportable pursuant to 6.9.2.b.4. The leakage was con- l l 0 l 7 l [ fined to the Auxiliary Building with no release to the environment so there was no l 10181l threat to the public health and safety. l 80 7 8 9 C DE ODE S BCO E COMPONENT CODE SUB DE SU E

[012] I P l C lh [E_jh [F_j h l V l Al L l V l E l X lh Wh y h 13 18 13 20 7 8 9 10 11 12

_ SEQUENTIAL OCCURRENCE REPORT REVISION LE R, RO EVENT YE AR REPORT No. CODE TYPE N O.

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_ l21 8l22 1l 23 24 26 27 28 29 30 31 32 TK N A O ON PL NT MT HOURS 22 SB IT D FOR b B. SUPPL MAN FACTURER l A ]Qy@ [C_jg 33 34 35 l36 Zl@31 l0l0l0l0l 40

]g 41 Wg 42

]g 43 l Fl 1l 5 l 3lg 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h

,, gag;The leak resulted from a failed bonnet-to-body gasket on valve CVC-291. The gasket  ;

,, g,,gwas replaced, and the valve was returned to service at 2311 hours0.0267 days <br />0.642 hours <br />0.00382 weeks <br />8.793355e-4 months <br /> o'n November 30,  ;

, , l1981. A detailed inspection of the gasket and valve showed no obvious abnormal de- g gg radation. This failure is considered an isolated event, and no further action is l

, , y necessary.  ;

7 8 9 80 ST S  % POWER OTHER STATUS IS O RY DISCOVERY DESCRIPTION y W@ l0 l0 l0 l@l N/A l l Al@l Operator Observation l ACTIVITY CO TENT RELEASED OF RELEASE AMOUNT OF ACTIVITY LOCATION oF RELEASE Floor Drain to Waste Storage i o W @ lM_j@l 0.025 Curies 44 l l 45 80 l

7 8 9 to 11 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION i 7 l 0 l 0 l 0 l@l Z l@l N/A l PEnSONNE t iN2; WIES NUMBER DESCRIPTION i a N/A l 7 8 9 l 0 l 0 l 0 l@l11 12 80 LOSS OF oR DAMAGE TO FACILITY TYPE DESCRIPTION 1 9 W @l10 8201130037 011230 N/A l 7 . 9 PDR ADOCK 05000261 80 PUBLICITv S PDR' NRC USE ONLY

• ISSUED DESCRIPTION 2 o W h! Local Press' Release Made on 11/30/81 in Raleich. N. C. l lllllllllllllf 7 .8 9 to 68 69 80 5 NAME OF PREPARER lioward T. Cox PHONE: (803) 383-4524 ~ 2,

O c

fe SUPPLEMENTAL INFORMATION FOR LICENSEE EVENT REPORT 81-29

1. Cause Description and Analysis On November 30, 1981, at approximately 1330 hours0.0154 days <br />0.369 hours <br />0.0022 weeks <br />5.06065e-4 months <br /> with the unit at hot shutdown conditions, a leak was discovered in the Chemical and Volume Control System (CVCS). The Jeak source was located and identified as coming from Reactor Coolant Pump Seal Injection Iso-lation Valve CVC-291. CVC-291 and the associated flowpath from "A" charging pump were isolated at 1356 hours0.0157 days <br />0.377 hours <br />0.00224 weeks <br />5.15958e-4 months <br /> which terminated the leak.

Investigation revealed that the valve bonnet-to-body gasket had failed and resulted in approximately 1500 gallons of low activity water being released from the CVC System to the Auxiliary Building floor drains and subsequently to the Waste Disposal System.

This event resulted in the abnormal degradation of a system designed to contain radioactive material which is reportable pursuant to 6.9.2.b.4. The leakage was confined to the Aur.iliary Building with no release to the environment so there was no threat to the public health and safety.

2. Corrective Action As stated above, valve CVC-291 was isolated at 1356 hours0.0157 days <br />0.377 hours <br />0.00224 weeks <br />5.15958e-4 months <br />. The valve bonnet-to-body gasket was replaced, and the valve, including the flowpath from "A" charging pump, was returned to service at 2311 hours0.0267 days <br />0.642 hours <br />0.00382 weeks <br />8.793355e-4 months <br /> on November 30, 1981.

3. Cctrective Action To Prevent Recurrence A detailed inspection of the gasket and valve showed no obvious unusual degradation. This event is therefore considered an isolated failure, and no further action is necessary, i tm