ML20028B159

LER 82-129/03L-0:on 821018,condensate Leak Discovered in Heater Bay Between Heaters 13c & 14c.Caused by Crack in Socket Weld of High Vent 1CB027C.Valve Cut Out & Replaced

ML20028B159
Person / Time
Site:	LaSalle
Issue date:	11/15/1982
From:	Masterson V COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20028B154	List: ML20028B153 ML20028B159
References
LER-82-129-03L, LER-82-129-3L, NUDOCS 8211300112
Download: ML20028B159 (2)

Text

{{#Wiki_filter:DV R ])- b -TE-WNJ LCUtc M %$ g 1 m hTtnrW Mg w y lh COpTROL BLOCK: l l l l l (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 6

] ! 11 LI               L l s i c l l l@i o l o I - lLICENSE                  o l oNUM8EH l o l o l o I- 26lo l ol@26l4!110lolol@l LICENSE TYPE J3 i
                                                                                                                                                   $7 CAT a6 lg LICENSEE COOE                14    16 9

] 3a "t'

                     ,] Ql 0 l 5 l 0 l 0 l 0 l 31713 j@l                            b5 1 1011 63 18 18 l274 l@l111 EVENT DATE                 75 l1 15 l 81280l@

REPORT DATE 3 60 61 DOCKET MMBER EVENT OESCRIPTION AND PROBABLE CONSEQUENCES h l ]I On October 18, 1982 a condensate leak was discovered in the L.P. heater bay between j gl g; heaters 13c and 14c. Cause of leak was a crack in the socket weld of high vent valve l ICB027C. The spill was contained in'the L.P. heater bay and routed via floor drains l g; ti Radwaste. The plant was at 28% PWR at the time of the occurrence. Operation was l g; transferred to an alternate string and the defective string was isolated Safety of l g; the plant, personnel and general public was mai-ntained at all times.  ; gl . 80

                                      '"             "#"'                                                                suYc"OSE      su'Io*0E SOOE                 C0OE        sNCi$E                  COMPONENT CODE

] l Hl H l@ l A l@ lE l@ l P l ll P l E l X l X l@ 9 10 11 12 13 18 19 @@ lZ 20 l@ s OCCURRENCE stEPORT REvtSION SEQUENTIAL No, REPORT NO. COOE TYPE EVENT YE AR h ,aEg LER/RO [.--J l 1l 2l 9l l/l lo l3 l [L_l {--,j [0,_j y _ l21 8l 2] 22 23 24 26 27 N M 30 31 32 HOURS s8 i O FOR ufL PLI M MAN F RER N AC O ON PLA T ME l33C lgl34Zl@ l35Z l@ l36Zl@ l0l0l0l0l 37 40 l43Y l@ W@ II l@ 42 43 l44Z l 9 l9 l 947l@ CAusE OESCRIPTION ANO CORRECTIVE ACTIONS h . I ]I The 'cause of leak was insuf ficient weld depth on the pipe to valve weld. The valve l gl

-                 was cutout and replaced with' a new valve and welded back in place.                                                         A new valve was l gI used even though the old valv'e was still in good working order in order to obtain a                                                                   j gg more suitable weld preparation.                                                                                                                         l gg 8 9 is O RY                           OtSCOVE RY DESCRIPTION sA s                 % POWER                        OTHER status l

] lBl@ lol2lol@l NA l lAl@l" OBSERVATfoN a

    'JT,virY CRTENT                                                                                                      LoeATION CF RELEASE 4 ELE ASED OF RELE AsE                        AVOUNT OF ACTIVITY Na                                                           l NA                    l          l DIZl@3 9

[Z_J@l 10 11 44 45 80 PERSONNEL E xPOSUREs NUV6 E R OEsCRipTION - l NA ] 'l 0 ' l 0 l 0 lhlTYPEZlhl 2 "

              ,E R s ON ~ El',mu'R,Es NuvseR               DESCRIPTION @                                                                                                 -

l. >

] l0l0l01@l 4 9 11 12 NA 80 Loss 05 OR OAvaGE To FACILtTY . TYPE O E SCRIPTION ,l

 ]lZl@l NA 8211300112 821116                                                                     NRC USE ONLY g

St:CRiPriON h PDR ADOCK 05000373 lllllllg;lll{{ ]lNfhl issu E PDR [ S E0. " 68 69 4 3 tC o V. flasterson PHONE. (815) 357-67(r) N AYE 08 PRED ARER _

g-

l. LER HUMBER: 82-129/03L-0

11. LASALLE COUNTY STATION: Unit i 111. DOCKET NUMBER: 050-373 IV. EVENT DESCRIPTION:

On October 18, 1982, the Shif t Engineer was inforned of a condensate leak between L.P. heaters 13c and the in the Unit 1 L.P. heater bay. Upon closer investigation it was determined that the socket weld on the high point vent valve ICB027C upstream side was the cause. All leakage was contained in the area and routed to Radwaste via equipment floor drains. A work request was ini tiated and L.P. heater string "C" was bypassed and isolated for repair. V. PROBABLE CONSEQUENCES: At the time of the occurrence, LaSalle Unit I was at 28% power with the { mode switch in run. There are a total of 3 L.P. heater strings, each rated for 33% operation. Only I L.P. heater string was required for 28% operation. This left 2 L.P. heater strings available and allowed for transferring to an alter- I nate L.P. heater string while isolating the defective string. Thus plant operation was not affected at the lower power level for this reason. The leak was discovered early, was contained in the L.P. heater bay, and sent to Radwaste via equipment drains. Surveys performed indicated rad levels at spill area did not exceed 5 mrem /hr, and no airborne contami-nation was present. Safety of the plant, the plant personnel and that of the general public was maintained at all times. VI. CAUSE: The cause of the occurrence was insufficient depth of the weld material on the valve to pipe weld. Vil. CORRECTIVE ACTION: On October 18, 1982 a work request (L19803) was initiated to correct the problem of the cracked socket weld. Under this request the valve was cut out and new valve of the some manufacturer (Hancock, Dresser ind.) was welded in place. Even though the original valve was in fine working order it was replaced due to the fact that a more suitable weld prepara-tion could be obtained with a new valve vice the old valve. Prepared by: Vincent Masterson}}