ML19343B102
| ML19343B102 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 03/19/1976 |
| From: | Autio H, Janet Staub YANKEE ATOMIC ELECTRIC CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| RO-50-29-75-12, NUDOCS 8012040289 | |
| Download: ML19343B102 (4) | |
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YANKEE ATOMIC ELECTRIC COMPANY m.
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Rowe,Mossachusctis 01367
,*YnKiii'es March 19, 1976 43 f ' L z;,n;' -b l :'
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I Mr. J. P. O'Reilly, Director
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U.S. Nuclear Regulatory Comission E-
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King of Prussia, Pennsylvania 19406 O'T]{ '
Subj ect:
Reportable Occurrence 50-29/75-12/10 Pressurizer W.R. Level Scram Instrument Setpoint Out Of Specification
Dear Mr. O'Reilly:
The cause descriptien of the subject Licensee Event Report has been found to be incorrect.
The attached Licensee Event Report is here by submitted to correct the error.
Very truly yours,
%42GGW i
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Herbert A. Autio Plant Superintendent JLS/mid
Enclosure:
i cc:
(40) Director, Office of Inspection and Enforcement i
U.S. Nuclear Regulatory Commission Washington, D.C.
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Director, Office of Management Information 4 Program Control U.S. Nuclear Regulatory Commission Washington, D.C. 20555 (Bo n o, o 2 89 l-
TFLC171@
Update Report Igigs ggD t
/76 lGl E
CONTROL BLOCK:l l
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l (pLEASE PRINT ALL REtul2ED INFtRMATION) 1 6
3 NAME LICENSE NUMBER 8 l Ml Al 11 K l Rl 1l l0 l0 l-p l0 l0 l0 l0 l-l0 l 0 l l4l1 [ [L l1 l l0l1l E
TYPE 1
7 89 14 15 25 26 30 31 32 I
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caTEcDay OOCKET NUMBER EVENT OATE REPORT OATE O 1 CON'T l l
j l0l lL l l0 l 5 l 0 l-p p l2 l9 l l1 l1 l1 l 4 l 7 l 5l l0 l3 l1 l9 l 7 l 6l j
7 8 57 58 59 60 61 68 69 74 75 80 I
EVENT DESCRIPTION l
l During nomal refueling operations a routine calibration check of the pressurizer wid9 o2 7 89
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Q lrange level instrument found the high level scram setpoint set greater than the 80 l
7 89 l technical specification limit of 200 inches.
This event was reported as Reportable l
80 o4 7 89 M l Occurrence 50-29/75-12 on 12/12/75.
The cause description of that report was found tol 80 7 89
@ lbe incorrect.
Following an evaluation of the actual cause the below listed (cont'd) 1 80 7 89 Pave 80 DE CO E CCMPONENT CODE R
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l I l NI Sl Tl R l U l lNl lh' l1 l2 l0 l
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[ (See Attached Sheet) l 7 89 oa l 80 I
7 89 3l Bo 7 89 l
SIu's sT s cov.Ea OmER STATUS OSCOVE DISCOVERY OESCAPTON 8
ltLJ lo lo lo l l NA l
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7 8 9
10 12 13 44 45 46 80 ELE SEO ELE SE AMOUNT OF ACTIVITY LOCATON OF AELEASE 11EJ Lz_J Lal I x4 I
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7 8 9
10 11 44 45 PERSONNEL EXPOSUAES 80 NUMBEA TYPE CESCADTrON is in 1010 l Lz_1 l x4 I
7 89 11 12
'3 80 PEASONNEL INJUA;ES r.ur.*eE n cESC=pTON 10 10 10I l NA i
I 7 89 11 12 OFFSITE CONSEGUENCES 15 l NA l
7 89 80 LCSS DA DAMAGE TO FACIUTY
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vrE DEsCn:oTON U
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15 7 89 10 80 PUBUCtTY
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7 89 ACOITIONAL FACTOA3 l(Erent Description, cont'd.) cause description is submitted and includes the l
15 7 89
[2pjlcorrectiveaction.
l 7 89 J.~L. Staub NAME:
-413-625-6140 PHONE:
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75-12/10 W
Cause Gescription: The Westinghouse 927D633, Gr. 1, Standard Bistable Ass-..oly used for the Pressurizer Wide Range level Scram tripped at 203 inches vice the Technical Specification limit of 200 in.
This was initially attributed to instrument setpoint drift and the instrument was calibrated and tested satisfactorily.
Further evaluation of the incident revealed that the instrument could possibly have been out of specification since the previous calibration performed 5/27/74. By the procedure effective at that time the Wide Range Level Scram setpoint was adjusted to trip at an indicated level of 200 fi?e while the tolerance on the indicated level was plus or minus 9.4 inches which could have lead to the setpoint being out of tolerance high.
Tne procedure has been revised to adjust the setpoint to an actual level of 180 inches, down 20 inches from 200 inches to allow for instrteent drift.
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u.s., NUCLE AR REGUL ATORY V ' MISSION DOCKET NUM!ER 3C-EV 12 761 i*
NRC DISTRIBUTION FOR PART 50 DOCKET M ATERI AL INCIDENT REPORT l
TO:
Mr C'Kailly FROM: Yankee J,tcaic Elec Cc OATE OF OOCUMENT 3-19-76
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3 A lhuti0 OATE RECEIVED l
3-22-76 l
OLETTER ONOTORIZEC
' PROP INPUT FORM NUMBER OF COPIES RECEIVED D ORIGIN AL hgNcLAsgg p t g g ncne signed GCOry ENCLOSURE OESCRIPTION l
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