ML17249A339
| ML17249A339 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 12/14/1979 |
| 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 7912180527 | |
| Download: ML17249A339 (6) | |
Text
REGULATO INFORMATION DISTRIBUTION TEM (RIDS)
ACCESSION NBRe7912180527 DOCeDATE ~ 79/12/14 NOTARIZED:
NO FACIE:50-244 Robert Em~et Ginna Nucl eai'l anti Uni t li Rochester G
AU'TH ~ NAME AUTHOR AFF'lL'IATION WHIl'4 L ~ D ~
Rochester Cas
& Electric Corp.
RhCIP,NAME RECIPIENT AFFILIATION ZIEAANN~D.L-,
Operating Reactor s 'Branch 2 (Pre 791030)
DOCKET 05000?44
SUBJECT:
Responds to NRC 791023 ltr re containment purging during normal plant operations',Purging done to. improve working or environ conditions. Valve openings restr,icted,Ventilation isolation sys modifi'ed requir'ing valve reset individually,.
DISTRIBUTION CODE:
A034S COPIES RECEIVED:LTR
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ROCHESTER GAS AND ELECTRIC CORPORATION D
S9 EAST AVENUE, ROCHESTER, N.Y. 14649 LEON D. WHITE, JR.
VICE PRESIDENT TEI.E PHONE AREA CODE TIE 546.2700 December 14, 1979 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:
Your letter of October 23, 1979, received on October 31, 1979, requested that Rochester Gas and Electric Corporation commit to an interim position on containment purging.
As a guideline, the Staff's interim position was enclosed.
The follow-ing commitments are made based on the Staff's guidelines:
In our letter of January 2,
1979 containment purging was limited 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.
Since purging time is limited, purging will only be done to improve working conditions in containment or improve environmental conditions for eguipment.
(Examples of improved working conditions would include reducing temperature, humidity, and/or airborne activity to permit efficient performance or to reduce occupational radiation exposures).
It should be noted that limiting containment purging to 90 hours0.00104 days <br />0.025 hours <br />1.488095e-4 weeks <br />3.4245e-5 months <br /> per year may result in increased personnel exposure during required Technical Specification surveillances.
2.(a)
On an interim basis the containment purge valves will be limited to be no more than approximately 50'pen while purging.
The limit will be achieved by installa-tion of mechanical stops.
This valve opening restric-tion will apply until it can be shown that the critical valve parts will not be damaged by the loads associated with closing against a Design Base Accident Loss of Coolant Accident.
n94 5 (0 79ls180 S7
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ROCHESTER GAS AND ELECTR CORP.
DATE December 14, 1979 To Mr. Dennis L. Ziemann SHEET NO.
(b) The containment ventilation isolation system consists of the four containment purge valves, two containment depressurization valves and two radiation monitor valves.
If open, these valves will automatically close on a Safety Injection (SI) signal, high containment activity, manual containment isolation, or manual spray.
If the containment ventilation isolation system reset is activated while a high containment activity signal or SI signal is present, these eight valves could be opened and the automatic closure of these valves is blocked 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 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 con-tainment ventilation isolation system reset alert the operator that. activating the reset blocks automatic closure of the eight valves on an SI signal.
If a high containment activity alarm is present, the reset will not, be used until the high containment activity alarm has been cleared unless SI has occurred.
Since the high containment activity will be cleared prior to activating the reset, the SI signal is uninhibited'and operable to initiate valve closure.
Therefore, equip-ment, modifications are not, necessary.
As part of the TMI Short Term Lessons Learned Item 2.1.4, the containment ventilation isolation system is being modified to require reset of each valve in the system individually, making inadvertent reset highly unlikely.
In addition the new reset control matrix will be backlighted to display the reset status of all isolation valves.
The operator can glance at the panel to determine reset, status at any time.
This modifica-tion is scheduled for completion during the March 1980 refueling outage.
Very truly yours, L. D. White, Jr.
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