ML17244A307

Ack Receipt of NRC 781129 Ltr Re Containment Purging During Normal Plant Operations.Plans to Justify Limiting Purging,Re Electrical Bypasses & Overrides,Will Be Completed by 790702

ML17244A307
Person / Time
Site:	Ginna
Issue date:	01/02/1979
From:	White L ROCHESTER GAS & ELECTRIC CORP.
To:	Ziemann D Office of Nuclear Reactor Regulation
References
TASK-06-04, TASK-6-4, TASK-RR NUDOCS 7901080129
Download: ML17244A307 (6)

Text

REGULATO' NFOBMATISN D I STB I BUTION 'STEM (B I DS )

ACCESS I ON NBB: 7901080129 DOC. DATE: 79/03/02 NOTARI ZED- NO DOCKET ag FACIL-50-244 GINNA, ROCHESTER GAS 8 ELECTRIC'ORPORATION 05000244 AUTH NAME

~ AUTHOR A FF I L I ATION WHITE, L.D.

~ BFCIP.NAMF.

ROCHESTER GAS 8 ELEC BECIPIFNT AFFILIATION ZIEMANN,D.Q. ***OPERATING REACTORS BRANCH 2

SUBJECT:

Ack receipt of NRC 781129 ltr re containment purging during normal plant operations. Plans to justify limiting purging, re electrical bypasses 8. overrides, by 790702.

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ROCHESTER GAS AHD ELECTRIC CORPORATIOH o 89 EAST AY~HUE ROCHESTER H Y 14649 LEON O. WHITE. JA. Tete>reouc vlcc pResloeNT i~ed cooe -Ic 5C6 2700 January 2, 1979 UÃ(goog~E.

Director of Nuclear Reactor Regulation Attention: Mr. Dennis L. Ziemann, Chief Operating Reactors Branch No. 2 U.S. Nuclear Regulatory Commission

'Washington, DC 20555

Subject:

Containment Purging During Normal Plant Operations R. E. Ginna Nuclear Power Plant Docket No. 50-244

Dear Mr. Ziemann:

This letter is in response to your letter dated November 29, 1978 which was received on December 1, 1978 regarding electrical bypasses and overrides in, the containment purge system.

It is our plan to justify limiting purging outlined in option 2 of your letter. Our evaluation for justifying continua-tion of limited purging during power operation should be completed by July 2, 1979. Pending completion of the NRC staff review of that evaluation the R. E. Ginna Nuclear Power Plant will limit purging to 90 hours0.00104 days <br />0.025 hours <br />1.488095e-4 weeks <br />3.4245e-5 months <br /> per year while the reactor is critical or operating as defined in the R. E. Ginna Technical Specifications.

No time restrictions need be placed on purging at shutdown condi-tions. Itresult should be noted that limiting containment purging to in increased personnel exposure during required 90 hr/yr Technical Specification surveillances.

A review of the containment ventilation isolation system has been made. The containment ventilation isolation system consists of the four containment purge valves, two containment depressuriza-tion valves and two radiation monitor valves. If Safety'njection open, these (SI) signal valves will automatically close on a or on high containment activity. If the containment ventilation isolation system reset is activated while a high containment activity signal or SI signal is present these these eight valves could valves is blocked be opened and the automatic closure of until the reset is deactivated. ,The reset is deactivated when both the SI signal and the high containment activity signals are cleared.

The purpose of the reset on the containment ventilation isolation system is to allow purging of containment in order to limit

0 ROCHESTER CAS AND ELECTRI ORP. SHEET NO.

January 2, 1979 Mr. Dennis L. Ziemann potential hydrogen concentration buildup following a postulated LOCA when high containment activity and SI signals could be present.

Procedures associated with the activation of the containment ventilation isolation system reset have been modified to alert the operator that activating the reset blocks automatic closure of the eight valves on an SI signal. If a high containment activity used until the high alarm is present the reset should not be containment activity alarm has been cleared unless SI has occurred.

A review of all remaining safety actuation signal circuits which incorporate a manual override feature is in progress. This review should be completed by mid February 1979. Until this review is complete the use of bypasses on unreviewed circuitry will be minimized to the maximum extent possible. It overrides may, however, be or resets in necessary in certain instances to employ order to perform certain necessary operations such as instrument tests or equipment maintenance.

Very truly yours, L. D. Nhi, Jr.

M7