ML20028B694
| ML20028B694 | |
| Person / Time | |
|---|---|
| Site: | 05000054 |
| Issue date: | 11/29/1982 |
| From: | Voth M UNION CARBIDE CORP. |
| To: | Bernard H Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8212030158 | |
| Download: ML20028B694 (2) | |
Text
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a e c e UNION CARBIDE CORPORATION MEDICAL PRODUCTS DIVISION P.O. BO. J24. TUXEDO, NEW YORK 10987 T E LEPHONE: 914-351 2131 ,
November 29, 1982 Director of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, DC 20555 Attn: Mr. Harold Bernard
. Standardization & Special Projects Branch Division of Licensing
Dear Sir:
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On May 23, 1980, Union Carbide Corporation filed for license renewa'l and Technical Specification changes to Operating License No. R-81, Docket No.
50-54 The majority of the Technical Specification changes requested are trivial in nature and not significantly impacted by the the prolonged license renewal schedule. Lack of action on one of the requested changes, however, has recently resulted in an unnecessarily prolonged shutdown. We therefore request early action on the following change.
Technical Specification 3.2.3 presently requires two of the three power level channels to be operable. A footnote requires.that the ion chamber of the third channel be operable prior to reactor startup. We request that the footnote be deleted. It does not increase reactor safety since an operable ion chamber does not constitute a third operable channel.
Futhermore, requiring a portion of the third channel is not consistent with the design and licensing philosphy of maintaining an operable channel, an operable backup (redundant) channel and when available an on-line spare to fulfill the requirements of two operable channels, I allowing continued reactor operation, should one of the three channels be i inoperable. The specific wording changes are indicated on the attached marked-up page 12 of the Technical Specifications.
Since this change is part of the license renewal application which was
- accompanied with the appropriate fee pursuant to 10 CFR 170.22 we do not believe an additional licensing fee is in order.
Yours very truly, Q
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hmNY Ma cus H. Voth Manager 8212030158 821129
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12.
3 2.3 Safety Channels
' The minimum number and type of channels providing automatic action that are required for reactor operation are as follows:
.- Channel No. Operable Function Operating Mode Power Level (normal) h Scram @ > 7.5 MV All !
Power Level (in te rmedia te) 1 Scram @ < 3 sec. period All Reverse @ < 10 sec. period All inhibit @ < 30 sec. period All c
Reverse All a
Count Rate l inhibit @ < 2 cps Startup inhibit @ < 30 sec. period Startup Pool Water Level 1 Scram @ < 22 f t. All Pool Temperature 1 Alarm @ > 120*F All Coolant Flcw 1 Scram @ < 1800 gpm cForced Ci rc.
Man. ' Button 1 Scram All Bridge Lock 1 Scram All Guide Tube Lift 1/ rod Scram All
( Flapper Valve 1 Scram (above 250 kW w/ valve open) -All Keyswitch 1 Scram All Notes: a. Operable below 50 W.
- b. Operable above 250 KW.
- c. Overpower reverse set points shall be set so that the relationship of pool temperature, flow and power levels shown in Figure 1 are never exceeded.
'd . Two powcr Icyc1 (ncr;nal) char.:01s-shah be requi-red te be operable for reacter operation. ^ third unce: pent 2ted ien ch nbpc is censidered a backup shall be operabic prior tc rc: ter etcrtur.
Bases - The power level scram provides redundant auto-retic protective action to prevent exceeding the safety linit on reactor powe r.
i The period scram, assisted by the intermediate, icvel l
! period reverse and rod inhibit, limi:s the rate of l i increase in reactor po.ier to values that are controll-able without reaching excessive po.-cr levels or tempera-ture. These functions are not li ' t iric sa fety sys to n (c: t i " . *
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