ML20128A791

From kanterella
Jump to navigation Jump to search

Documents Responses Provided to NRC at 930113 Telcon Re 921009 Request for Relief from ASME Code Covering Inservice Insp Program for Main Steam Relief Valve Test
ML20128A791
Person / Time
Site: Brunswick  Duke Energy icon.png
Issue date: 01/27/1993
From: Mccarthy D
CAROLINA POWER & LIGHT CO.
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NLS-93-019, NLS-93-19, TAC-M85064, TAC-M85065, NUDOCS 9302020313
Download: ML20128A791 (2)


Text

__x

c-gg,gg

~ Cerolina Power & Light Company lJAN 271993 SERIAL; NLS-93-019 3

0 United . rtes Nuclear Regulatory Commission C. ATTENTILN; Document Control Desk IF Washington, ET. 20555 BRUN" WICK STEAM ELECTRIC PLANT, UNIT NOS.1 AND 2

se DOCKET NOS. 50 325 & 50 324/ LICENSE NOS. DPR 71 & DPR-02 P ASME CODE RELIEF REQUEST INSERVICE INSPECTION PROGRAM MAIN ST5AM RELIEF VALVE PRESSURE TEST (NRC TAL NOS. M85064 AND M85065)

Gentlemen. ,

6 By letter dated October 9,1992 (Serial: NLS-92-26C1, Carolina Power & Ught Company (CP&L) "

l suumitted a request for relief from the ASME Code,Section XI, IWA-5211(b), lWA-5211(d), and IWD3227tf) relative to the requirement to pressure tost the discharge piping for the main steam --

sdety/ relief volves. The purpose of this letter is to document responses provided tv f P&L to NRC staff questions received during a January 13,1993 telephorc tonference concerning this request.

NRC Ouestion: What is the size of the main steam hce safetylielief valve discharge piping and of what materialis the piping?

Resnonse: The d%.targe lines from the main steam safety / relief valves corsist of 10-inch, Schedule 80, carbon steel piping.

NRC Ouestion: Does the main cteam line safety / relief valve discharge !.iping have any t'ipe of interior or exterior coating?

Ppam: This pipiri has a coating on the exterior only.

MLC Ouestion: Has any type of degradation of the main steam line safety / relief valve discharge piping been observed?

Resoonse: During the Unit I heload 7 outage (1992) and the Unit 2 Reload 9 outage (1991), portions of one dischargo line were temporarily removed to provide clearance for replacing feedwater check va!ves inside the drywell. No degradation of the temporarily removed discht ge piping was observed, and the piping was subsequently reinstalled.

NRC Ouestion: The relief request proposes to ase an Automatic Depressurization System test as an altema'e means of demonstrating the integrity c' the main steam line safety /fef valve discharge piping. How willleaks in these lines be detected?

930202cI'1 930127 PDR AIM'A 05000324 010106 0 PDR taWWmmesireemmemr manuTnemroma-411 Fayettevme street . P. o aox - t 5t

  • aci ,gn. N C. 27602 j hr{ .

rmm m -wr-me i

d  %>

Document Control Desk NLS-93-019 / Page 2 Resoonse: Air temperature monitors are located throughout the air space of the drywell and torus. During normai testing of the main steam safety / relief valves, an

} increase of approximately one (11 degree Fahrenheit is usually observed by temperature monitors in the vicinity of the discharge line associated with _he valve being tested. Therefore, if a crack / leak were to occur in a main steam safety / relief valvo discharge line, air space temperature observations in the vicinity of the line associated with the valve being tested are expe:ted to indicate a temperature increase of several degrees in excess of those typically observed during testing.

~~

Please refer any questions regarding this submittal to Mr. D. B. Waters at (919) 546 3678.

y

~, p; Yours very truly,

' YJ

>:'b f

D. C. McCarthy Manager Nuclear Licensing Section '

WRM/wrm (nts93019.wpf) cc: Mr. S. D. Ebneter Mr. P. D. Milano Mr. R. L Prevatte

---%2__ _