ML19254D704

LER 79-027/03L-0:on 790925,mainsteam Safety/Relief Valves Sin 67HH13 Had Setpoint of 1,088 Psig,Greater than Tech Spec Max.Caused by Setpoint Drift.Valve Adjusted to Proper Setpoint

ML19254D704
Person / Time
Site:	Vermont Yankee
Issue date:	10/24/1979
From:	Conway W VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19254D701	List: ML19254D700 ML19254D704
References
LER-79-027-03L, LER-79-27-3L, NUDOCS 7910290358
Download: ML19254D704 (1)

Text

{{#Wiki_filter:anu runm suo . . . . . . . . . - . . . . . . . - . . . . .... . . _ . . . . ,7 7J) ' LICENSEE EVENT REPORT LER 79-27/3L CONTROL BLOCK: l l l l l l (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) I b o 1 l v l LICENSEE r l v lCOoE v l c: l1 l@l0l0l-l0l0 14 15 0 l0 l0 l- l0 l0 l@l 4 l 1l LICENSE NUMBER 25 26 1l 1 1l@l5 7 L A f 58l@ LICENSE TYPE Jo 7 8 9 LON'T 0 l012 7 l168@l0 l9 EVENT2 l5 l7 l9 l@ 0 l2 4 l7 l980l@ 7 0 1 d 5$$lL]@l0l5 60 61 0 DOCK ET NUMBE R 69 DATE 74 l 75 REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h o 2 l While performing the refuel outage setpoint check of trio of the main steam safety / l o 3 l relief valves in accordance with Tech. Spec. Section 4.6.D.2, S/N 67HH13 had an as-o 4 l found setpoint of 1088 psig. Tech. Spec. Section 2.2.B requires that the setpoint be [ o s <1080 psig. As a result of this event, there were no consequences to the health and o o safety of the public. A similar occurrence was reported to the Commission as l 0 7 iRO 78-10/3L. l 0 H l 80 7 8 9 COYP. SYST E M CAUSE CAUSE VALVE CODE CODE SUBCODE COMPONENT CODE SU8 CODE SUBCODE 7 o 9 8 lC C l h (_E_j h l B l @ 9 10 11 12 13 Vl Al Ll Vl El Xlh Wh W h 18 19 20 SEQUENTI AL OCCURRENCE REPORT REVISION EVENT YEAR REPORT NO. CODE TYPE NO. LE R RO O gPORT . l7 9l l-l l 0l 2 7l y 27 l0l3l 28 29 Ll 30 l-31 l0l 32 _2t 22 23 24 26 ATT AC H M E N T NP R D-4 PRIME COMP. COMPONENT ACTION FUTURE EFFECT SHUTDOWN METHOD HOURS 22 SUBMI TT E D FORM 5UB. SU PP LI E R MANUFACTURER TAKEN ACTICN ON PL ANT 33El@34 Zl@ [ Z_j@ 35 lZ 36 l@ l0 l0 0 l0 l 3/ 40 W@ lYl@ lN@ l Tl 0 2l0l@ 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i o ]The cause of this occurrence is attributed to setpoint drift. The valve was dis- l [i li ] Iassembled, discs and seats hpped, reassembled, and adjusted to the proper setpoint. I i 7 lThe valve was manufactured by Target Rock Corporation, Model 67F. ( 1 3 ] l i 4 I 80 7 8 9 STA S ar. POWE R OTHER STATUS ISCOV HY DISCOVERY DESCRIPTION i 5 [gjh l0 l 0 0 hl NA l lB l@l Surveillance Test l ACTIVITY CONTENT RELE ASED OF RELE ASE AVOUNI OF ACTIVITY LOCATION OF RELE ASE l 7 i c 8 9 [2] @ d@ 10 11 NA 44 l l 45 NA 80 PERSONNEL EXPOSURES NUMBER TYPE DE SCRIPTION NA l l i l 71 l 0 ] 0 l 0 l@l Z l@l 8

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68 69 80 5 7 8 9 10 W. F. Conway PHONE: 802-257-7711 2, NAME OF PREPARER

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