ML17037C461

Letter Transmitting Amendment to the Operating License Consisting of Changes to the Technical Specifications. Changes Increase the Safety Margin for the Isolation Function for the Emergency Condensers

ML17037C461
Person / Time
Site:	Nine Mile Point
Issue date:	09/25/1974
From:	Thomas E B LeBoeuf, Lamb, Leiby & MacRae, Niagara Mohawk Power Corp
To:	US Atomic Energy Commission (AEC)
References
Download: ML17037C461 (12)

Text

0 AEC DISTRIBUTION FOR PART 50 DOCKET MATERIAL (TEMPORARY FORM)CONTROL NO: FILE 9881 F ROM:LeBoeuf,Lamb,Leiby,MacRa gash35ngtoq~

D.C.$0036 DATE OF DOC 9-25-74 DATE R EC'D 9-25-74 LTR TWX RPT, OTHER TO: AEC ORIG 1 signed CC OTHER SENT LOCAL PDR CLASS UNCLASS PROP INFO DESCR IPTION: INPUT XXX NO CYS REC'D 40 ENCLOSURES:

DOCKET NO: 50>>220 Ltr trans the following..

~~Amdt to the OL.~.consist of changes to the Tech specs...~.ACKNQWT"AGED (40 cys encl rec'd)PL'ANT NAME Nine Mile pt, 9-26-74 JB FOR ACTION/INFORMATION

/DO NOT REMOVE BUTLER (L)W/Copies CLARK (L)W/Copies PARR (L)W/Copies KNIEL (L)W/Copies SCHWENCER (L)W/Copies STOLZ (L)W/Copies VASSAL LO (L)W/Copies PURPLE (L)W/Copies ZIEMANN (L)REGAN (E)W/Copies" W/Copies DICKER (E)~LEAR (L)W/Copies W/copies KNI GHTON (E)W/Copies W/Copies YOUNGBLOOD (E)W/Copies W/Copies INTERNAL DISTRIBUTION

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ARVIN E.UPTON EUGENE B~THOMASr JR.LEONARD M.TROSTEN HARRY H.VOIGT LEX K.LARSON WASHINOTDN PARTNCRS~~t"UtShe Oact(eI F I.AW OFFICES OF LEBOEUF, LAMB, LEIBY 8(, MACRAE I767 N STREETr N.W.WAsHINGTQN, D.C.20036 September 25, 1974 ONE CHASE MANHATTAN PLAZA NCW YORK, N.Y.IODOS WASHINOTDN TCLCPHDNC ZOZ 878 8BBB CADLC ADDRESS LALALVr WASNINOTDN D.C.Director of Licensing U.S.Atomic Energy Commission Washington, D.C.20545 P'CPS/(~Re: Niagara Mohawk Power Corporation Docket No.50-220 Provisional 0 eratin License DPR-17

Dear Sir:

As counsel for Niagara Mohawk Power Corporation, we hereby transmit three (3)originals and nineteen (19)copies of an Application for Amendment.

to the Provisional Operating License in the above-captioned docket.Accompanying this application are forty (40)copies of a document entitled,"Proposed Changes in Technical SpecificationsN

.These changes to the Technical Specifications are proposed in accordance with the requirements of Sections 50.59(c)and 50.90 of the Commission's Rules and Regulations.

They would increase the safety margin for the isolation function for the emergency condensers.

r Very truly yours, LeBOEUF, LAMB, LEIBY&MacRAE Enclosures

'em'@@Spp ouzo pg><<""><or ogpu'oo~~rid CL@II Iot By Eugene B.Thomas, Jr.Partner

/if r)i'I r 4 (c BEFORE THE UNITED STATES ATOMIC ENERGY COMMISSION In the Matter of))NIAGARA MOHAVK POliER CORPORATION

)(Nine Mile Point Unit 1))Docket No.50-220 c 8 APPLICATION FOR PZKNDMENT TO~pgg)97/Q$WO;g 8liRQT COtk~AhSIO.I R.:gu,atÃ1 gsll gcctlro PROVISIONAL OPERATING LICENSE Niagara Mohawk Power Corporation, Licensee in the above-captioned docket, hereby files an Application for Amendment to its Provisional Operating License DPR-17.This Amendment would change the Technical Specifications with respect to the set-point for high steam flow in the emergency cooling system.h'ith this Application for Amendment, Licensee hereby transmits a document entitled"Proposed Change to Technical Specifications" describing the change and the reasons therefore.

The proposed change has been reviewed and approved by the Safety Review and Audit Board and the Site Operations Review Committee.

%1EREFORE, Licensee prays as in its original Application for Licenses.Respectfully submitted, NIAGARA H011AVK POWER CORPORATION Philip D.Raymond Vice President-Engineering Subscribed and sworn to before me this<<-day of September, 1974.H EL J.CARRICK Notary Public in tho State of New York Qualified in Onon.Co.No.452w4b0 hly t.'~~nis~un xxpirus bsarch 30,19'7A

~~l'<f't,v~V~...';~~" 1'e'l 4 L a'i~g'a'~I Proposed Changes to Technical Specifications Proposed changes to the Technical Specifications would increase safety margin for the isolation function for the emergency condensers.

The original set point for high steam flow in the emergency cooling system supply line was<29.5 psid.That set point was established on the basis of a short radius elbow installation.

After initial operation, a check of the fabrication drawings and field measurements indicated that a long radius elbow was actually installed.

A recalculation results in a revised set point of 19 psid representing a flow of 291 percent of maximum design capacity.This revised set point provides sufficient capability to isolate the emergency condensers on high flow due to a line break.Also sufficient margin exists such that the unit will not trip during normal operation.

The high flow used for this calculation is equivalent to a rupture of 30 percent of the pipe cross-sectional area.

0 J NIAGARA HOEKRV POWER CORPORATION License No.DPR-17 Doclcet No.50-220 Pro osed Chan e to Technical S ecifications Item Location~Chan e Basis for Section 3.6.2 Page 95 Change the fourth and fifth sentences in the first paragraph to read as follows: "The high flow set point for the emergency cooling system supply line is 19 psi differential.

This represents a flow of approximately 8.7 x 105 pounds per hour at rated condition." Table 3.6.2 c and 4.6.2 c Page 102 Change the set point under iten (3)Nigh Steam Flow Emergency Cooling System to 19 psid Crom<29.5 psid.

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