ML19291B574

Tech Spec Change Request 69 to DPR-50,App a Re Correction of Calculated Volumes of Boron Required to Bring Reactor to Cold Shutdown Condition Per Tech Spec 3.2.Certificate of Svc Encl

ML19291B574
Person / Time
Site:	Three Mile Island
Issue date:	01/27/1978
From:	Herbein J METROPOLITAN EDISON CO.
To:
Shared Package
ML19291B573	List: ML19291B572 ML19291B574
References
NUDOCS 7911080611
Download: ML19291B574 (5)

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FETROPCLITRI EDISC:I CCMPMIY JERSEY CE:ITRAL POWER & LIGHT CCIGANY AND PENNSYLVNIIA ELECTRIC CCI'PAITY THREE MILE ISLAND NUCLEAR STATION U'!IT 1 Operating License No. DPR-50 Docket No. 50-289 Technical Specification Chance Reauest No. 60 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.

LETROPOLITAN EDISO:I CC:GANY

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lice % esident Sworn and subscribed to me this N day of 1978.

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UNITED STATES OF AMERICA NUCLEAR REGULATORY C0!?IISSION IN THE MATTER OF DOCKET NO. 50-289 LICENSE NO. DPR-50 METROPOLITA'i EDISON CCMPANY This is to certify that a copy of Technical Specificaticn Change Request No. 69 to Appendix A of the Operating License for Three Mile Island Nuclear Station Unit 1, has, en the date given below, been filed with the U. S. Nuclear Regulatory Ccn=ission and been served on the chief executives of Londonderry Township, Dauphin County, Pennsylvania and Dauphin County, Pennsylvania by deposit in the United States rail, addressed as follows:

Mr. Weldon B. Arehart Mr. Harry B. Reese, Jr.

Beard of Supervisors of Board of County Cc=nissioners Londenderry Township of Dauphin County R. D. #1, Geyers Church Road Dauphin County Court House Middletown, Pennsylvania 17057 Harrisburg, Pennsylvania 17120 METRCPOLITAN EDISCN COMPANY

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' Tice President Dated: January 27 , 1978 1583 293

Three idle Island Nuclear Station Unit I Cperating License No. DPR-50 Docket No. 50-289 Technical Specificatien Chance Recuest No. 69 The licensee requests that the attached revised pages replace pages 3-19 and 3-20 of the existing Technical Specifications.

Psasons for Chance Recuest As stated in Event Report 77-29/1T, an error was found in the methods used to calculate the volume of boron required to bring the reactor to a cold shutdown condition as required by Technical Specification 3.2. This change request introduces the corrected volumes as supplied by our USSS.

Safety Analysis Justifying the Change Recuest This change request increases the volume of the beron solution in, the boric acid mix tank, the reclained boric acid storage tank, and the borated water s:crage tank as required by Technical Specification 3.2. There is no change to any operating procedure or equipment. Therefore, (i) the probability of eccurrence or the consequences of an accident or malfunction of equipment important to safety previously evaluated in the safety analysis report is not increased; (ii) the possibility of an accident or =21 function of a different type than any evaluated previously in the safety analysis report is not created; (iii) the margin of safety defined in the basis for any technical specification is not reduced.

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22 !?AU?? A::3 FURIFICATIC.N ND GFMICAL ADDITIO:. 3?!:TFM;.,

Atclinatility Applies to the operational status of the makeup and purification and the chemical addition s stems.

Objective To provide for adequate boration under all operating conditions to assure ability to bring the reactor to a cold shutdown condition.

Specification The reactor shall not be critical unless the following conditions are cet:

3.2.1 Two makeup and purification pumps are operable except as specified in 3.3.2.

3.2.2 A source of concentrated boric acid solution, in addition to the borated water storaSe tank, is available and operable. This can be either:

a. The 800 ftbogic acidppm of 8700 mix boron tank containing at least as boric acid the equivalent solution of with a te=perature of at least 100 F above the crystallization temperature.

System piping and valves necessary to establish a flow path from the tank to the =s.keup and purification system shall also be operable and shall have at least the same temperature requirement as the boric acid =ix tank. One associated boric acid pump shall be operable,

b. A reclaimed boric acid storage tank containing at least the equivalent of 800 ft3 of 8700 ppm boren as boric acid solutien with a temperature of at least 10 ? above the crystallization temperature. System piping and valves necessary to establish a flow path from the tank to the makeup and purification system shall also be operable and shall have at least the same temperature requirement as the reclaimed boric acid tank. One associated reclaimed boric acid pump shall be operable.

Ences

~'he takeup and purification system and chemical addi1i n systens provide This is normally acntrol of the reactor coolant boron concentration.

acccmplished by using any of the three makeup and purification pumps in series

-ith a beric acid pump associatei with the boric acid mix tank or a reclaimed tcric acid pu=p associated with a reclaimed boric acid storage tank. The alterncte method of bera. tion vill be tna use of the makeup and purificatier cut;s tcking suction directly from the borated water storage tani. (2)

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D**D *D Y co c . .:2 Tne quantity of boric acid in storage from either of the three above mentioned scurces is sufficient to berate the reactor coolant system to a one percent suteritical margin in the cold condition at the vorst time in core life with a stuck centrol rod, assembly. Minimum volumes (including a 10 percent safety factor) of 800 ft0 of 6700 ppm boron as concentrated boric acid colutien in the boric acid mix tank or in a reclaimed boric acid storage tank or 26,500 gallons of 2270 ppm boron as boric acid solution in the borated water storage tank (3) vill each satisfy this requirement. The specification assures that at least two of these supplies are available whenever the reactor is critical so that a single failure vill not prevent boration to a cold condition. The minimum volumes of boric acid solution given include the boren necessary to account for xenon decay.

The primary method of adding boren to the reactor coolant system is to pump the concentrated boric acid solution (8700 ppm boren, mini =um) into the makeup tank using either the 10 gym boric acid pumps or the 30 gym reclaimed boric acid pumps. Using only one of the two 10 gym boric acid pumps, the required volume can be injected in less than ten hours. The alternate method of addition is to inject boric acid from the borated water storage tank using the makeup and purification punps. The required 26,500 gallons of boric acid can be injected in less than three and one half hours using only one of the =akeup and purification pumps.

Concentration of boron in the boric acid mix tank or a reclaimed boric acid storage tank may be higher than the concentration which would crystallize at ambient conditions. For this reason, the boric acid mix tank is provided with an im=ersien electric heating element and the reclaimed boric acid tanks are provided with low pressure steam heating jackets to maintain the temperature of their contents well above (100 F or more) the crystalIlization temperature of the boric acid solution contained in them. Both types of heaters are controlled by temperature sensors immersed in the solution centained in the t anks . Further, all piping, pu=ps and valves associated with the boric acid mix tank and the reclaimed beric acid storage tanks to transport boric acid solution from them to the makeup and purification system are provided with redundant electrical heat tracing to ensure that the boric acid solution vill be maintained 100 F cr more above its crystallization temperature. The electrical heat tracing is controlled by the temperature of the external surfaces of the piping systems. Once in the makeup and purification system, the boric acid solution is sufficiently veil mixed and diluted so that nonnal system temperatures assure boric acid solubility.

References (1) i3AR, Sections 9 1 and 9 2 I2) 7SAR, Figure 6.2 5

Technical J:ecifi ?ation 2. .

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