View source for 05000293/LER-1981-036-03, /03L-0:on 810709,during Testing,Pressure Switches PS-263-53A & PS-263-52A Were Found Higher than Setpoint. Caused by Setpoint Drift.Switches Recalibr

{{Adams
| number = ML20010B265
| issue date = 08/07/1981
| title = /03L-0:on 810709,during Testing,Pressure Switches PS-263-53A & PS-263-52A Were Found Higher than Setpoint. Caused by Setpoint Drift.Switches Recalibr
| author name = Whitney G
| author affiliation = BOSTON EDISON CO.
| addressee name = 
| addressee affiliation = NRC OFFICE OF INSPECTION &amp; ENFORCEMENT (IE REGION I)
| docket = 05000293
| license number = 
| contact person = 
| document report number = LER-81-036-03L, LER-81-36-3L, NUDOCS 8108140287
| package number = ML20010B263
| document type = LICENSEE EVENT REPORT (SEE ALSO AO RO), TEXT-SAFETY REPORT
| page count = 1
}}
{{LER
| Title = /03L-0:on 810709,during Testing,Pressure Switches PS-263-53A & PS-263-52A Were Found Higher than Setpoint. Caused by Setpoint Drift.Switches Recalibr
| Plant = 
| Reporting criterion = 
| Power level = 
| Mode = 
| Docket = 05000293
| LER year = 1981
| LER number = 36
| LER revision = 3
| Event date = 
| Report date = 
| ENS = 
| abstract = 
}}

=text=
{{#Wiki_filter:e NBC FOE *j 366 U. S. NUCLEAR REGULATORY COMMISSION (7 77)
* LICENSEE EVENT REPORT CONTROL BLOCK: l l
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60 61 DOCK ET NUMB ER 68 69 EVENT D ATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBA8LE CONSEQUENCES h I o I 2 I I In performance of Surveillance Tests 8.M.2-2.1.7 Td 8.M.2-2.1.8 pressure switches l
I o 131. PS-263-53A and PS-263-52A respectively were found to be higher than the setpoint.
l l o g. l l This is in violation of T.S. Table 3.2.B which states 400 PSIG + 25.
This is l
l o i s i I permissive for core spray and LPCI admission valves. The as-found data for each l
Io is l l was: 53A-445 psig and 52A-450 psig.
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COOE TYPE N O.
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40 di 42 43 44 av CAUSE DESCRIPTION AND CORRECTIVE ACTIONS l i l o l l The switches were re-calibrated to conform to the T.S. setnoint and an investication I ii,i ; } initiated by I&C who have determined root cause. Set point drift of these narticular
,,,.,, ; switches _ is a recognized trait: they are sensitive to system pressure.
Future l
li,3gl calibration practice will reflect that experience.
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% POWER OTHER STATUS ISCO RY DISCOVERY DESCRIPTION N.A.
l l Blhl Routine Test l
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12 11 44 45 46 80 RELEASED OF RELEASE AMOUNT OF ACTIVtTY LOCATION OF RELEASE N.A.
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==DESCRIPTION==
l1 l 7 l !0 l0 l0 lhl TYPE @l l
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PERSONNE'L iN;UdiES cESCRiPTiOsh NousER N A.
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8 9 11 12 LOSS OF OR OAMAGE TO FACILITY Q TY8E

==DESCRIPTION==
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Pu8uSTv 8108140287 810807 1 NRC USE ONLY DESCRIPT10N b PDR ADOCK 05000293s iSSuEo [2_1,o_jlN lhl S
PDR' N.A.
I llll1IIIIIIIl5 68 69 80 ;
7 8 9 10 617-746-7900 2
tney PHONE:
NAME OF PRC?ARER
}}

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