ML19209B879

From kanterella
Jump to navigation Jump to search
Forwards Response to IE Bulletin 79-13,Revision 1.Original Radiographic Test of Main Feedwater Nozzle to Pipe Well Provides Accurate Baseline for Comparison of Any Subsequent Insp
ML19209B879
Person / Time
Site: McGuire Duke Energy icon.png
Issue date: 09/19/1979
From: Parker W
DUKE POWER CO.
To: James O'Reilly
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
NUDOCS 7910110092
Download: ML19209B879 (2)


Text

'[46 <u.

'I s CIO Ed7 DUKE POWER COMPANY USNRO PFr .i Powra nuiwixo

^ N/20 Socra Cnuncu Srazzr, CRARWTTz, N. C. asa4a wituAu v'ec o. panac4K p.cs'ordt" p g g A g. 09 September 19, 1979 Tc'c.-o'.c. ^a c a 7o4 Secame P.oowetiose 373-4083 Mr. J. F. O'Reilly, Director U.S. Nuclear Regulatory Con: mission Region II 101 Marietta Street, Suite 3100 Atlanta, GA 30303 Re: McGuire Nuclear Station IE Bulletin 79-13, Revision 1 f.II:JPO 50-369

Dear Mr. O'Reill:

r:

Attached is our respons to IE Bulletin 79-13, Revision 1.

Ver truly yours,

. i.  %

J tej _ Lj . .

Williar O. Parker, Jr.

THH/sch Attachment 9

==-

S anoang# . .

df

[(O s

\: lO 265 Anniv rsa 7910110

%,**'" '#f 9902.45 fg5FICIALCOPY

McGuire Nuclear Station Response to USNRC IE Bulletin 79-13, Revision 1 Item 5

a. The design of McGuire Nuclear Station features both a main feedwater nozzle and an auxiliary feedwater nozzle. During the Hot Functional Test at McGuire all of the feedwater flow to the steam generators passed through the auxiliary feedwater nozzle. Consequently the original radiographic test of the main feedwater nozzle-to-pipe weld provides an accurate baselir e for comparison of any subsequent inspec-tions of this weld. Duke Power Company will perform another radio-graphic test of the auxiliary feedwater nozzle-to-pipe weld pri,r to January 1, 1980.
b. Duke Power Company is currently revising both the operating and emergency procedures addressing a feedwater line break accident. These procedures are being revised to enhance operator ability to recognize, and recover from this accident.
c. The primary method of detecting feedwater leakage inside containment is by monitoring the containment floor and equipment sump level. The sump level detectors can sense a sump level change of one half inch.

Therefore a leakage rate of one gallon / minute inside containment is detectable after approximately forty minutes. Other methods of detecting leakage inside containment are discussed in the McGuire FSAR, Section 5.2.7.

Although the primary emphasis of this section concerns reactor coolant system leakage the methodology is appropriate for detecting feedwater leakage. Sampling the fluid in the containment sump accurately iden-tifies the source of the leakage.

i1~0 266 Z. , _