ML19261A838

LER 78-039/03L-0 on 781218:test Results Found HPCI Initiation Switches Associated W/Drywell Pressure Instruments Not in Accordance W/Tech Specs.Caused by Procedural Inadequacy;Switches Excluded from Test Program

ML19261A838
Person / Time
Site:	Quad Cities
Issue date:	01/16/1979
From:	Tietz G COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19261A834	List: ML19261A833 ML19261A838
References
LER-78-039-03L, LER-78-39-3L, NUDOCS 7902080222
Download: ML19261A838 (2)

Text

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REPO;tT DATE 7 8 60 61 DOCK ET f.UY3 EH 63 EVENT DATE EVENT DESCRIPTION AND PRO 3 ABLE CONSEQUENCES h The calibration and functional test surveillance frequency for testina the HPC l

[o l2 ] l g 3 g initiation switches associated with drywell pressure instruments PS l-1001-89A thru D _l g 4  ;

was found not be in accordance with Technical Specification Table 4.2-1. Upon g g calibration, all switches were found to be within the prescribed limits, thus HPCI l g g g initiation was not jeopardized by this event. I o 7  !

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34 l32 Z i@ 36 3/ 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h 1 Ol Procedural inadequacy-The HPCI switches were inadvertently excluded f rom the monthly l

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l. LER NUMBER: LER/R0 78-39/03L-0

11. LICENSEE NAME: Commonwealth Edison Company Quad-Cities Nuclear Power Station Ill. FACILITY NA"~' Unit Two IV. DOCKET NUMBER: 050-265 V. EVENT DESCRIPTION:

On December 18, 1978, it was noticed that the two switches of PS 2-1001-89A were tested at dif ferent intervals. These switches sense high drywell pressure and trip at 2.0 psig. Switch number 1 in conjunction with a low-low reactor water level signal will start the 120 second timer to initiate the Auto Blowdown System. This switch has been functionally tested monthly in accordance with Technical Specification Table 4.2-1.

Switch number 2 , which initiates HPCI, has been functionally tested each operating cycle during refuel outages. Upon discovery of the problem, a temporary procedure was written to calibrate and functionally test the switches. All eight switches were found to be within specifications.

VI. PROBABLE CONSEQUENCES OF THE OCCURRENCE:

The safety implications of this occurrence are minimal due to the fact HPCI would have initiated as intended had a high drywell pressure condition occurred. Switch number 2 of PS 1001-89A thru D has been functionally tested each operating cycle with no previous failures since installation.

Vll. CAUSE:

The cause of this occurrence is attributed to procedure inadequacy.

Pressure switches 1001-89A thru D have two separate internal switches, and the HPCI initiation switch was inadvertantly excluded f rom the ECCS instrumentation test program.

Vill. CORRECTIVE ACTION:

The immediate corrective action was to write a temporary procedure, number 1155, to functionally test and calibrate the pressure switches while the unit was in operation. All four switches were found to be within the prescribed setpoints. The temporary procedure willbe implemented as a permanent procedure. The pressure swi tches were manufactured by Static-0-Ring, model number 12N-AA5-PP.