ML19350C503

Application to Amend App a to DPR-50.Tech Spec Change Request 34B Withdraws Pages 3/4-102 & 3/4 106 of Tech Spec Change Request 34A.Table 3.3-12 Contained Error in Number of Hydrogen & Oxygen Monitors for Waste Gas Holdup Sys

ML19350C503
Person / Time
Site:	Three Mile Island
Issue date:	03/27/1981
From:	Hukill H METROPOLITAN EDISON CO.
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ML19350C502	List: ML19350C501 ML19350C503 ML19350C504
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NUDOCS 8104030451
Download: ML19350C503 (4)

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O METROPOLITAN EDISON COMPANY JERSEY CENTRAL POWER & LIGHT COMPANY AND PENNSYLVANIA ELECTRIC COMPAhT THREE MILE ISLAND NUCLEAR STATION, UNIT 1 Opetating License No. DPR-50 Docket No. 50-289 Technical Specification Change Request No. 34B This Technical Specification Change Request is submitted in support of Licensee's request to change Appendix A to Operating License No.

.DPR-50 for Three Mile Island Nuclear Station, Unit 1. As a part of this request, proposed replacement pages for Appendix A are also included.

J METROPOLITAN EDISON COMPAhi By

'N Dif(ctor,TMI-l H. D. Hukill Swornandsubscribedtomethis07 day of N a A / ,198f JYMth N NotaryPplf

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FAMELA JOY LUBRchT; Notary PuNic Mcktctown. Daghir CWMy, Ps My C2Jnnsirt b; ins A; gust 23,1933 I

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j UNITED STATES OF AMERICA 5 9

NUCLEAR REGULATORY COMMISSION s

IN THE MATTER OF DOCKET NO. 50-289 LICENSE NO. DPR-50 METROPOLITAF EDISON COMPANY This is to certify that a copy of Technical Specification Change " quest No. 34B to Appendix A of the Operating License for Three Mile Is. d Nucitar Station Unit 1, has, on the date given below, been filed with the U. S. Nuclear Regulatory Commission and been served on the chief executives of Londonderry Township, Dauphin County, Pennsylvania and Dauphin County, Pennsylvania by deposit in the United States mail,

. addressed as follows:

Mr.. Donald Hoover, Chairman Mr. John E. Minnich, Chairman Board of Supervisors of Board of County Commissioners Londonderry Township of Dauphin County R.D. #1, Geyers Church. Road Dauphin County Courthouse Middletown, PA 17057 Harrisburg, PA 17120 METROPOLITAN EDISON COMPANY By i

' 1 ~ Dilidctor, TMI-l H. D. Hukill Dated: March 27, 1981

o ".

• Three Mile Island Nuclear Station, Unit 1 (TMI-1)

Operating License No. DPR-50 Docket No. 50-289

1. TECHNICAL SPECIFICATION CHANGE REQUEST NO. 34B:

The licensee hereby withdraws from consideration Pages 3/4-102 and 3/4 106 of Technical Specification Change Request No. 34A dated October 3, 1980 (TLL-493) and~ substitutes the attached changed pages.

II.- REASON FOR CHANGE REQUEST:

Table 3.3-12' contained an error in that the number of hydrogen and oxy-gen monitors for the Waste Gas (WG) Holdup System is improperly stated.

TMI-1 has one hydrogen / oxygen monitor for the WG System and, therefore, can-not comply with the specification as previously written. In the event that the NRC believes that more than one. monitor is necessary, the basis for such a need should be provided for licensee consideration. We currently believe that one monitor backed-up by grab sampling is adequate in light of the very low potential for exceeding concentration limits for 2nese gases.

. Action Statement No. 30 is also changed to be consistent with the need for monitoring and the number of monitors available. In addition, the for-mer action celled for.an. activity.that would further increase hydrogen con-centration at a time when no monitoring exists. A more appropriate action

" is to obtain grab samples and minimize activities that can increase hydro-gen concentration until the monitor is returned to service.

III. . SAFETY EVALUATION JUSTIFYING CHANGE:

The Safety Evaluation for Technical Specification Change Request No. 34A remains' valid and is applicable to this change.

In addition, the potential for adverse.ccecentrations of hydrogen and oxygen in the WG System is very. low. A nitrogen overpressure is maintained on the WG. headers; therefore, the only source of oxygen in the system is from the RCS. .The RCS is maintained with about 20cc/kg hydrogen in solution in order.to eliminate. oxygen. .The source of hydrogen in the WG System is the RCS due to letdown evolutions. When letting down coolant, the volume of the WG System (bleed tanks and vent neader) must at least equal the volume of coolant

- letdown in order to accomodate the amount letdown. Therefore, in order to exceed.4% hydrogen in the vent header, assuming 100% degassing, RC hydrogen

! concentration must exceed 40cc/kg.- Normally..the available volume for

. letdown greatly exceeds the volume of coolant letdown. The RCS hydrogen concentration also rarely exceeds 25cc/kg and is essentially limited by the hydroged overpressure maintained in the Makeup Tank (30 psi hydrogen -

fpressure) to less than.30cc/kg. The vent header concentration is further

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' diluted by the volume of the WG tanks-(1125'ft. 3). In the five years of TMI-l operation,-hydrogen concentration in the-Wg System has rarely

" approached.0.1%.' We are.also unaware of Waste Gas System hydrogen or oxygen

concentration'being a problem at"any pressurized water reator facility.

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The llays Gas Analyzer at TMI-l samples hydrogen / oxygen at 10 different points in the waste gas system:

a. Miscellaneous Waste Evaporator Tank

b. Miscellaneous Waste Storage Tank

c. Reactor Coolant Bleed Tanks (3)

d. Waste Gas Decay Tanks (3)

e. Reactor Coolant Evaporator

f. Reactor Coolant Drain Tank At approximately 2 minutes sample / purge time per point a complete cycle can be accomplished in approximately 20 minutes.

A grab sample / analysis of the 10 point system vould take approximately 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />.

IV. AMENMENT CLASSIFICATION PER 10CFR170.22:

This amendment is' exempt from any fees, since it is an amendment to a pre-vious change request. _ filed on June 4,1976 at the request of the NRC, and the amendment classification discussion of Technical Specification Change Request No. 34A remains valid.

V. IMPLDfENTATION:

These changes will be incorporated into the TMI-l Technical Specifications ninety.(90) days following NRC approval.

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