ML20084E077
| ML20084E077 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 03/17/1975 |
| From: | Stephenson B COMMONWEALTH EDISON CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| 169-75, 3019, RO-50-237-75-15, NUDOCS 8304140054 | |
| Download: ML20084E077 (3) | |
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799 Roosevelt Road Glen Ellyn, IL 60137
SUBJECT:
REPORT OF UNUSUAL EVD:T P51 SECTIC'! 6.6.C OF THE Tm"NICAL SPECIPICATIC::S lilGH PRPSSthtE COOLI.ITP INJECTICN HIGH FLOW SWITCH SFTFOII;T ERIFT Referenecc: 1) Regulatory Guide 1.16 Rev. 1 Appendix A
- 2) Notification of Region III of U.S. Nuclear Regulatory Cc::::tission Telephone:
W. Knop, 1600 hro, 3/7/75 Telegram:
J. Keppler, 1645 hrs, 3/7/75
- 3) Drawing Number: M-51-12E2527 Report Number:
50-237/75-15 Report Date: 17 March 1975 Occurrence: 7 March 1975 Facility: Dresden Nuclear Fower Station, Morris, IL 60450 IDD:TIFICI.TICN OF CCCl*RRD:CE IIPCI Stcan Line High Flow Instrument Technical Specification Setpoint Violation.
This occurrence was initially concidered an abnoncal occurrence.
Further revica has ccncluded that this cystcm hos not been required to be operable cince the last curveillance was perforced on January 16, 1975 Therefore, this occurrence has been reclascified as an unusual event.
CONDITIO: 0 PRIO'l TO OCCURREICE Drceden Unit 2 wac in the shutdown mode with a major refueling outaco in progress.
_DESCRIPPION OF OCCURRE*CE During routine instrument curveillnr.ce of Freasu.c Switch DPIS2-2352, the observed setpoint was fou::d to be 155 inches H 0 DP increacint;. Thic cetpoint 3
ic above the Technical Spccification Linit of less than or equal to 150 inches U 0 DP.
Tne cwitch was irrediately reset to 140 inches.
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DESIGNATIO 10F APP 1.RZ;T CAUSE OF OCCURRC:CE (DESIG'!/DEFICIE:'CY)
Pressure Suitch DPIS2-2352 hac had a history of eetpoint drift. The switch hac been. inspected by the vendor (Perton) and identified as having an excessively high ranSe for the cetpoint required. Modification IG2-74-lh2 has been initiated to correct the range problem.
[1?ALYSIS OF OCCURREN'CE The function of DPIS2-2352 in to eence high flow in the IIPCI steam cupply, and initiate an isolation of the IIFCI system. With the reactor in refuel and the head retroyed, the HPCI system in not required to be operable. The switch was last checked on January 16, 1975, and found to be well within limits.
It is thereforo concluded thst the cafety of plant personnel or the cencral public was in no way, jeopardized as a result of thic switch cotpoint.
CORRECTIVE 1.CTIO!i The rance of the cwitch uill be changed by replacing the switch bellows in accordance with Modification 1112-74-142.
FAILURE DAT/s Switch DPIS2-2352 was found with a setpoint above the Technical Specifications en January of 1973 The cwitch is a Barton Model 288 with a range of -200 to +200 inch H 0.
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SUBJECT:
DPR19, DRESDEN NUCLEAR POWER STATION, UNIT 2.
!'d is a THIS WILL CONFIRM A CONVERSATION WITH MR KNOPF OF YOUR OFkICE IT; 5S
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1615 HOURS THIS DATE CONCERNING INSTRUMENT DRIFT ON HIGH P8 ESSURE 4 is j
COOLANT INJECTION STEAM LINE HIGH FLOW ISOLATION SWITCH DPIS2-2352.D t
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TECH SPEC LIMIT IS EQUIVALENT TO 150 INCHES OF H2O AND SWITCH WAS %
1 FOUND TO BE SET AT 155 INCHES OF H20.. THERE IS NO PARTICULAR SAFETY {,
1l" SIGNIFICANTS TO THE FAILURE AS HPCI SYSTEM HAS NOT BEEN REQUIRED SINCE THE LAST SUCCESSFUL TEST OF THE SWITCH.
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It;STRUMENT MECHANICS HAVE CHANGED FROM WATER BATH TO AIR BATH TECHNIQUE FOR TESTING SET POINT AND THIS MAY BE A - FACTOR IN SET POINT DISCREPANCIES A NEW TYPE SWITCH IS PLANNED FOR INSTALLATION THIS OUTAGE IN LIGHT OF PREVIOUS SWITCH SET POINT DRIFT PROSLEM B B STEPHENSON SUPERINTENDENT DRESDEN NUCLEAR P04ER STATION g*
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