ML19317G328

LER 78-012/03L-0:on 780203,steamline Rupture Matrix Actuated During Heatup & Before Entry Into Operational Mode 2.Caused by Dead Band Shift of 600 Psig Pressure Switches MS-94,95- PS2.Switches Recalibr & Manual Bypass to Be Installed

ML19317G328
Person / Time
Site:	Crystal River
Issue date:	02/24/1978
From:	Cooper J FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19317G318	List: ML19317G317 ML19317G328
References
LER-78-012-03L, LER-78-12-3L, NUDOCS 8002280935
Download: ML19317G328 (2)

Text

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io,.ir3.3.2.1. Redundant "A" natrix available and operable. No safety hazard ,

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,,,o,I The cause of this event was due to dead band shift of the 600 psig pressure, i i i i i i switches MS-94, 95-PS2.

The switches were recalibrated and REI initiated I

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W (N SUPPLDE'NTARY INFORMATION

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1. Report No.: 50-302/78-12/03L-0 ,

2. Facility: Crystal River Unit #3

3. Report Date: 24 February 1978 4 Occurrence Date: 3 February 1978

5. Identification of occurrence:

Automatic actuation of the "B" steam line rupture natrix contrary to Table 3.3-3 of Technical Specification 3.3.2.1.

6. Conditions Prior to Occurrence:

Mode 3 operation.

7. Description of Occurrence: l At 1930, during plant heatup and prior to entry into operational Mode 2, the "B" 5 steam line rupture matrix actuated at approxima':aly 760 psig. The 36 hour4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br /> Action Statement was entered in accordance with action #10 of the Tech Spec. Feedwater valves WV-28 and 39 were manually opened to re-establish flow to the "3B" Once Through Steam Generator. Maintenance personnel were notified and Work Raquest b4 #T-1794 was initiated. Maintenanca restored operability of the "B" steam line V rupture matrix and the Action Statement was satisfied at 2355. 1

8. Designation of Apparent Cause:

This event was due to an upward drift of the " Dead Band" of the 600 psig bypass pressure switches in that the switches did not reset from previous cooldown.

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9. Analysis of Occurrence:

There was no safety hazard to the plant or general public as a result of this occurrence. l l

10. <rrective Action:

Pressure switches MS-94, 95-PS2 were re-calibrated and a Request for Engineering Informa-tion was submitted to install manual bypasses so that each of the matricies can be by-passed, but interlocked so only one matriz can be bypassed at any one time.

11. Failure Data:

This is the first occurrence of this event.

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