ML20002A468
| ML20002A468 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 04/19/1977 |
| From: | French J YANKEE ATOMIC ELECTRIC CO. |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| WYR-77-40, NUDOCS 8011170282 | |
| Download: ML20002A468 (3) | |
Text
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Tcliphons bl7 366-9011 rwx 750 390 0739 YANKEE ATOMIC ELECTRIC COMPANY
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20 Turnpoke Road Westborough, Mossochusetts 01581
, ANKEE
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,N h April 19, 1977 EWAI0ilY DOCKEiRLUDPY kSN ki United States Nuclear Regulatory Cor:=ission k'
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Washington, D. C.
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Attention: Office of Nuclear Reactor Regulation
Subject:
Yankee Rowe Proposed ECCS Modification for Core XIII
Reference:
(a)
License No. DPR-3 (Docket No. 50-29)
(b)
Letter from W. P. Johnson to USNRC, WYR 76-119, (November 22, 1976)
(c) Meeting with NRC Staff on October 22, 1976, regarding Yankee Rowe ECCS/Accur.ulator Modification (d) Letter from W. P. Johnson to USNRC, WYR 77-1, (January 6,1977)
(e)
NRC hlecon Re: Yankee Rowe Proposed Change #145 on 7
Dear Sir:
Reference (e) resulted in a request from NRC that Yankee Atomic Electric Ccmpany provide written response to several questions and concerns regarding proposed modifications to the ECCS at the Yankee Rowe plant. Answers to these questions /conceras are provided as Attachment A to this letter.
Any further questions should be directed to Mr'. Paul A. Rainey at our Engineering Office, 20 Turnpike Road, Westborough, Massachusetts, 01581, (617) 366-9011 (Ext. 2985).
Very truly yours, YANKEE ATOMIC ELECTRIC COMPANY C
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i J. L. French Manager of Operations JKT/kg
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P Attachment A' 4
A response to the following questions / concerns was requested by the NRC during the telephone conversation of 3/25/77.
l.
A concern' was expressed about th'e increased stresses on the
-accumulator, piping and other components due to increasing the operating pressure from 337 psig'to 500 psig.
l Ans. The existing accumulator and the-new expansion tank are designed to Section VIII of the ASME B & PV code. The design pressure of the accumulator is 550 psig @ 100 F and the expansion tank has a design pressure of 720 psig i
@ 100 F.
The accumulator piping was designed to ANSI B31.7 and has a design pressure of 720 psig @ 100 F.
Since the'new operating. conditions are less severe than the design conditions, the stresses induced are lower than code allowables and the factors of safety remain
. greater than those used for the component design.
r 2.
The normal status and mode of operation of MOV-1 was unclear.
Ans. - MOV-1 is normally in the open position and will close automatically.when level switches 3.and 4 close and actuate their respective relays.
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Consists of ansvers to questior.s regarding proposed n:odifications to, the ECCS........
.DQNOT REMOVE (1-P)
(1-P) 1 J.A? T li/JIC:
Yankee Rowe CR OWLEDGED ut
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