ML19260C121

LER 79-037/03L-0:on 791114 During Routine Maint,Leakage Discovered on Boric Acid Evaporator B Concentrates Pump Discharge Line,Due to Hairline Crack in Type 304 Stainless Steel Pipe.Caused by Chloride Stress Corrosion Cracking

ML19260C121
Person / Time
Site:	Millstone
Issue date:	12/07/1979
From:	Harris J NORTHEAST UTILITIES
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19260C117	List: ML19260C116 ML19260C121
References
LER-79-037-031, LER-79-37-31, NUDOCS 7912180601
Download: ML19260C121 (1)

Text

(7 771 LICENSEE EVENT REPORT coNToot stocic: l I i l l Ig (ptgAsg pagNT on TYPE ALL REQUIRED INFoRMATIONI E I 8clT I MIN lS 12 l@l0l01-l0101010l- 01010l@l 14 15 LICEN$E NUM8ER 25 4 111l1l@l5 7 CAl T 58I@

UCENSE TYPg JQ 7 9 LICENSEE CODE con'T E E l Ll@l 015 l 01010131316 l@l1 11EVENT 68 63 110 ATE14 17 Ig l@lIl2l0l7l719l@

74 75 REPOR 7 DATE 80 7 8 60 El DOCKET NUMBER EVENT DESCRIPTloN AND PROBABLE CONSEQUENCES h O 2 l During routine maintenance, leakage was discovered on the boric acid evaporator "B" I ITTT1 I concentrates pump discharge line. Examination revealed a hairline crack in a 1-1/2 in.1 ULL*J type 304, schedule 105 stainless steel pipe. A patch was applied to the crack to stoo I

~

O s I the leakage. The leakage was contained with> the Radwaste System. Similar occur- l ULL8J l rences: LER 76-28/3L, dated 5/21/79. LER 76-25/30, dated 1/31/77 and LER 79-33, dated i O 7 I

[_1_1/ 9/79.

O 8 CO 'o'E *^E CO suNEE COMPONENT CODE $ e "OO'E SU DE ITITl l M I A l@ [E_j@ [0,j@ l P l I I P l F l X l X l@ l Al@ l 2371 @

7 8 9 10 11 12 13 18 19 SEQUENTIAL OCCURRENCE REPORT REVistON LE R/RO EVENT YEAR R EPORT NO. CODE TYPE N O.

@ ,RuE l 7l 9l 21 22 l-l 23 l 0 l 3 l'7 l 24 26 M

27 10 l 3 23 29 LL_j 30

[-j 31

[0_j 32 KN AC 0 0 P T ME HOURS S I FOR 8. SUPPLt MANUF C RER

(_B_j@[.A_j@ (_ Z.[@ [Z_j@ l0l0 0l0 iN @

41 Yl@ [Aj@ l A l2 44 1 1547l @

33 34 36 36 37 40 42 43 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i O l The cause of the failure is chloride stress corrosion cracking resultino from an I g i earlier brief cross-tie of aerated radwaste (high chloride) and clean liquid radwaste i 2 I systems in 1975. The cracked pipe spool will be reolaced when material is available, i 1 3 l To prevent similar occurrences, the boric acid piDino is beina protected by maintaininal i 4 I low chloride concentrations.

's EE sPOweR OTHER status @ EsEOSRv' oisCOvERv oEsCRiPTiON @

!i s l_lj@ ll' l0 l0 l@l NA l Bl@l** Routine maintenance l

' ' " 8" Activity CO0 TENT RELEASED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE ITT81 LZj @ t.z_jgl NA 44 l l 45 NA 30 l

7 8 9 to 11 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION i 7 l 0l O l O l@l Z l@l NA l

' ' ' ,ERsONNEt

• N;u' dies NuusER oEsCRIPTION@

l L'.Ja.Jl0 7 8 9 010l@l 11 12 NA go o' o "'

@ l613 334 i 9 8 9 m'E @=^P1 n '^c'""

Nl l NA go l

7

,g to ust Cin g}g } d U f Cl NRC UsE ONLY ,

2 O l N f@0g l eq,p,,9g _

NA l llllllllllltl}

7 8 9 to 68 69 80 5 PHONE:

203-447-1791 {

NAME oF PREPARER