ML20215D623

Followup Ro:On 861128,operator Inadvertently Closed Main Steam Line Isolation Valves 3516 & 3517 Instead of Containment Vessel Depressurization Valves,Causing Pressurizer High Pressure Reactor Trip

ML20215D623
Person / Time
Site:	Ginna
Issue date:	12/11/1986
From:	Kober R ROCHESTER GAS & ELECTRIC CORP.
To:	NRC OFFICE OF ADMINISTRATION (ADM)
References
NUDOCS 8612160424
Download: ML20215D623 (2)

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• ROCHESTER GAS AND ELECTRIC CORPORATION e 89 EAST AVENUE, ROCHESTER, N.Y. 14645'0001  ;

ROGER W. MOBER z7/c"'cEEm =mucrm .. . co[c$.Y4e.2 7oo December 11, 1986 U.S. Nuclear Regulatory Commission Document Control Desk Washington, DC 20555

Subject:

Follow-up Summary of Unusual Event at R.E. Ginna Nuclear Power Plant on November 28, 1986 Docket No. 50-244 In accordance with the NUREG-0654 reporting requirements, which require a written summary of close out or class reduction condi-tions, the following is submitted for the Unusual Event declared at R.E. Ginna Nuclear Power Plant on November 28, 1986:

l On November 28, 1986 at 1116 hours0.0129 days <br />0.31 hours <br />0.00185 weeks <br />4.24638e-4 months <br /> with the reactor at 100%

l power, the reactor Containment Vessel (CV) was being depressur-ized per Operating Procedure 0-11 (Control of Containment Depressurization Valves While Reactor is Critical) . At this time, with CV depressurization complete, the Licensed Control Operator proceeded to close the 2 CV depressurization valves (AOV-7970 AND AOV-7971) but inadvertently closed the Main Steamline Isolation Valves (MSIV) 3516 and 3517 which were just below the CV depressurization valves on the Main control Board. This caused a pressurizer high pressure reactor trip at 2377 psig within approximately 5 seconds.

At 1127 hours0.013 days <br />0.313 hours <br />0.00186 weeks <br />4.288235e-4 months <br />, the Shift Supervisor declared an Unusual Event in accordance with the SC-100 "Ginna Station Event Evaluation and Classification" for reactor coolant pressure greater than 2335 psig.

Following the automatic reactor trip the pressurizer pressure returned to normal and the plant was stabilized in hot shutdown with no compromise to plant safety or the health and welfare of the general public.

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ROCHESTER GAS AND ELECTRIC CORP. SHEET NO. 2 DATE December 11, 1986 TO U.S. Nuclear Regulatory Concission With Superintendent - Support Services and plant staff approval, the Shift Supervisor declared the Unusual Event terminated at 1220 hours0.0141 days <br />0.339 hours <br />0.00202 weeks <br />4.6421e-4 months <br />, in accordance with SC-llo "Ginna Station Event i Evaluation For Reducing the Classification".

V truly yours, af & Kober Roger W.

xc: U.S. Nuclear Regulatory Commission Region I 631 Park Avenue King of Prussia, PA 19406 L