05000271/LER-1979-027-03, /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

/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 File:NorthStar Vermont Yankee icon.png
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: 05000271/LER-1979-027, Forwards LER 79-027/03L-0 05000271/LER-1979-027-03, /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
References
LER-79-027-03L, LER-79-27-3L, NUDOCS 7910290358
Download: ML19254D704 (1)

LER-1979-027, /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

Event date:
Report date:
2711979027R03 - NRC Website

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 l v l r l v l v l c: l1 l@l0l0l-l0l0 0 l0 l0 l-l0 l0 l@l 4 l 1l 1l 1 1l@l l@ o 1 7 8 9 LICENSEE COoE 14 15 LICENSE NUMBER 25 26 LICENSE TYPE Jo 5 7 L A f 58 LON'T 5$$lL]@l0l5 0 0 l012 7 l1 @l0 l9 2 l5 l7 l9 l@ l 0 l2 4 l7 l9 l@ 0 1 7 d 60 61 DOCK ET NUMBE R 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h l While performing the refuel outage setpoint check of trio of the main steam safety / l o 2 l relief valves in accordance with Tech. Spec. Section 4.6.D.2, S/N 67HH13 had an as-o 3 l found setpoint of 1088 psig. Tech. Spec. Section 2.2.B requires that the setpoint be [ o 4 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 iRO 78-10/3L. l 0 7 l 0 H l 80 7 8 9 SYST E M

CAUSE

CAUSE COYP. VALVE CODE CODE SUBCODE COMPONENT CODE SU8 CODE SUBCODE o 9 lC C l h (_E_j h l B l @ Vl Al Ll Vl El Xlh Wh W h 7 8 9 10 11 12 13 18 19 20 SEQUENTI AL OCCURRENCE REPORT REVISION LE R RO EVENT YEAR REPORT NO. CODE TYPE NO. O gPORT l7 9l l-l l 0l 2 7l y l0l3l Ll l-l0l _2t 22 23 24 26 27 28 29 30 31 32 ACTION FUTURE EFFECT SHUTDOWN ATT AC H M E N T NP R D-4 PRIME COMP. COMPONENT TAKEN ACTICN ON PL ANT METHOD HOURS 22 SUBMI TT E D FORM 5UB. SU PP LI E R MANUFACTURER El@34 Zl@ [ Z_j@ lZ l@ l0 l0 0 l0 l W@ lYl@ lN@ l Tl 0 2l0l@ 35 36 3/ 40 41 42 43 44 47 33 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h ]The cause of this occurrence is attributed to setpoint drift. The valve was dis-l i o [i li ] Iassembled, discs and seats hpped, reassembled, and adjusted to the proper setpoint. I lThe valve was manufactured by Target Rock Corporation, Model 67F. ( i 7 1 3 ] l i 4 I 80 7 8 9 STA S ar. POWE R OTHER STATUS ISCOV HY DISCOVERY DESCRIPTION NA l lB l@l Surveillance Test l hl [gjh l0 l 0 0 i 5 ACTIVITY CONTENT RELE ASED OF RELE ASE AVOUNI OF ACTIVITY LOCATION OF RELE ASE l NA l l NA [2] @ d@ i c 7 8 9 10 11 44 45 80 PERSONNEL EXPOSURES NUMBER TYPE DE SCRIPTION l l i l 71 l 0 ] 0 l 0 l@l Z l@l NA 8 2 PERSONNE L mu' RIES DESCn, prion @ NUMeE n l l0l0l0l@l NA i a AC 80 -{ y ] 7 8 9 1 12 LOSS OF OR DAMAGE TO FACILITY y TYPE DE SCf*.F ilON l li l 9 l lljh! NA 80 7 8 9 10 DE SCRIP TION Lu NA l lll lllll lll[ 'SSUEf81 2 o 68 69 80 5 7 8 9 10 802-257-7711 2, W. F. Conway PHONE: NAME OF PREPARER

- 7 910 2 9 03f8

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