ML19343B118

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RO 50-29/75-17:on 751204,calibr Check of Loop Wide Range Cold Leg Temp Indicator 1 Found Bistable Setpoint in Excess of Tech Specs Limit.Caused by Coolant Loop Valve Interlock Drift
ML19343B118
Person / Time
Site: Yankee Rowe
Issue date: 01/02/1976
From: Autio H, Janet Staub
YANKEE ATOMIC ELECTRIC CO.
To: James O'Reilly
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
RO-50-29-75-17, NUDOCS 8012040437
Download: ML19343B118 (3)


Text

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55. J. P. O'Reilly U.S. Nuclear Regulatory Comission

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..,m Office of Inspection and Enforcement P T;-Q Pagion 1 \\4 631 Park Avenue King of Prussia, Pennsylvania 19406 N cn

Subject:

Reportable Occurrence 50-29/75-17 loop No.1 Shin Coolant Valve Interlock Instrument Setpoint Drift

Dear 3'r. O' Reil'ly:

In accordance with Technical Specifications, Section E.2.b., the attached Licensee Event' Report is hereby submitted. Very truly yours, hyb:wu l} ' llb b~ i Herbert A. Autio Plant Superintendent JLS/nid E. losure cc: -(40) Director, Office of Inspection and Enforcement U. S. Nuclear Regulatory Comission Washington, D. C. 20555 (3) Director, Office of Management Infomation and Program Control U. S.. aclear Regulatory Comission V Washington, D.C. 20555 f g u 3, s .,R u.,g c, [, pg _7 bl E \\- / 8012040 g

LFENSEE EVENT REPORT .CONTAOL BLOCX:l l l l lT * (. t (PLEA 7E PRINT ALL REIUIRED INFOIMATIONT ,1, 1 6 A E LCENSE NUMBER Y YPE l Ml Al Yl Kl Rl lj l 0 l 0 l-l 0l 0l 0l 0[ 0 l-l0 l0 l l4 l1 l1 l1 l1 l l0l1l i 01

f, 7 89 14 15 25 26 30 31 32 CATEOOAY TY S U CE OCCKET NUMBEA EVENT OATE REPOAT OATE

+ @ CONT l l l [L_j lLl l 0l 5l 0l-l0 l0 l2 l9 l l1 l 2 l 01 4 l 7l 51 l 0 l l l 0 l 2l 7l 6l. l: 7 8 57 58 59 60 61 68 69 74 75 eo EVENT DESCRIPTION @ IDuring normal refueling operations a routine calibratibn check of the No.1 loop wide l. 7 89 80 @ Irance cold lee temnerature indicator found the bistable setpoint in excess of the tech-l 7 89 l 80 ME Inical specification limit. This constitutes a violation of technical specifications l

l 7 89 60 g'

@ ISection E.2.b.(1) and is reported as Reportable Occurrence No. 50-29/75-17. l 7 89 gg l 06 l l 7 89 paing so MAWAc E CODE COMPONENT CODE s A viotAnos j-0 lI l B l y lIlNlSlTlRlUl y lW l1 l2 l0 l [ 7 89 10 11 12 17 43 44 47 48 ii CAUSE DESCR;PTION lThe Westinghouse Tyne 927D633, bistable used for the No.1 Main Coolant loop Valve In-l o8 7 89 80 lterlock had drifted s xh that the setpoint was greater than the 30*F technical l o9 7 89 80 1 o l specification limit._The bistable was set to a point more conservative than the tech-l FActuTY METHOO OF STATUS % POWEA OTHER STATUS OtSCOVERY 0:SCOVEAY OESCRIPTION 11 lHl l0 l 0l 0l l NA j W l Routine Calibration Check l-7 8 9 10 12 13 _ 44 45 46 80 PE E SED OF kEASE AMOUNT OF ACTIVITY LOCATION OF AELEASE LzJ Lzd i NA l l M li i2 7 8 9 10 11 44 45 '80 ; PERSONNEL EXPOSURES NUMBio TYPE DESCA>PTION [nal l0101 oi Lz_I I m I 7 89 11 12 13 80 PERSONNEL INJURIES l NUMEEA OESCEPT'ON me 10101 Ol I u l 7 89 11 12 80 OFFSITE CONSEQUENCES 15 l NA l' 7 89 80 LOSS OR DAMAGE TO FACluTY .-:.*E DESCPof.CN Wl NA l 13 7 89 10 EO PUGUCITY 17 l NA l 7 89 EO ADDITIONAL FACTORS l Cause Description (con'td) nical specification limit to prec'lude exceeding the limit l 1a 7 89 BD l if the instrtnent should drift again. I to 7 89 W J.L. Mas - pggyg, GE 4W ~ nave:

NRC DIS s k.UTION FOR PART SO DOCKET M/( R_lA_L (TEMPORARY FORM) ~ CON' -{0 L NO: 9/ i j FILE: INCIDEur REl' ORT T2 / j FROM:Yankec' Atomic Elec co DATE OF DOC DATE REC'D LTR TWX RPT OTHER l R $e[ss 1-2-76 1-5-76 XXXX ~ TO: ORIG CC l OTHER SENT AEC PDR XX Mr O'Reilly none signed XX p CLASS UNCLASS PROPINFO INPUT NO CYS REC'D DOCKET NO: 3 1 50-29 n XX DESCRIPTION: ENCLOSURES: Ltr trans the'following: Licnesee Event Report'#75-17 on 12-4-75 concerning setpoint drift in the Loop #1 main coolant valve interlock instrum'ent setpoint drift....... 1 } PLANT NAME: Yankee Rowe FOR ACTION /INFORMATION 1-7-76 chf BUTLER (L) SCHWENCER (L) ZlEMANN (L) REG AN (E) W/ Copies W/ Copics W/ Copies W/ Copics CLARK (L) STOLZ (L) DICKER (E) LEAR (L) W/ Cocies W/ Copies W/ Cocies W/ Copies PARR (L) VASSALLO (L) KNIGHTOfi (E) SPELS W/ Copies W/ Copies W/ Copics W/ Copies KNIEL (L) PURPLE (L) YOUNGBLOOD (E) REID W/ Copics A'/DCopies W/ Copics W/ Copies INTERNAL DISTRIBUTION f REG FILE TECH REVIEW DENTON LIC ASST A/T IND. f NRC PDR pSCHROEDER yGRIMES R. DIGGS (L) BRAITMAN g 03C, MOOM P-506A #MACCARY GAMMILL H. GE ARIN (L) SALTZMAN GDSSICK/ STAFF KNIGHT KASTNER E. GOULBOURNE (L) MELTZ CASE PAWLICKI BALLARD P. KREUTZER (E) f SHAO SPANG LER J. LEE (L) _P_1. ANS BOYD

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