ML17257A480
| ML17257A480 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 07/13/1981 |
| From: | Maier J ROCHESTER GAS & ELECTRIC CORP. |
| To: | Crutchfield D Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8107170197 | |
| Download: ML17257A480 (5) | |
Text
REGULATORY ORNATION DISTRIBUTION SY'>>
(RIOR)
ACCESSION NSR:8107170197 DOC, DATE'. 81/07/13=
NOTARIZED:: NO DOCKET' FACIL(:50 244 Rober t Emmet( Ginna Nucl ear( Pl anti Uni t ii Rochester G
05000244 AUTHBYNAME'UTHOR AFFILIATION MAIERiJ,E
~
Rochester Gas L Electr,ic CorpG RECIP'B NAMEI RECIPIENT AFFILIATION CRUTCHF IELDi D ~
Operating Reactor s Br anch 5
SUBJECT:
Responds
-to NRC 810708 telcon-re: boron dilution at>> shutdown;;
Existing plant procedures comb(oned-w/generic Westinghouse" criter(ia. allow adequate time; for( termination>> of dilution eVent before>> return to critical, occurs,'ISTRIBUTION CODEt:
A001S COPIES RECEXVED+L(TR ENCL SIZE',
TITLEi: General Distr ibution for( af te'r Issuance> of Operating, L(i cense,
'OTES'.
1 copy:SEP Sect+
Ldr".
05000244 RECIPIENT ID CODE/NAMEI ACTION OR8 ¹5 BC.'4 INTERNAI e D/DIRiHUM FAC08, ISE~
oe OELD 11 RAD ASMT BR COPIES LTTR ENCL 13 1
2 1
1 RECIPIENT ID CODE/NAME'IRiDIV OF LIC.
NRC PDR 02I 0
(
SS BR 10 G FIL>>
01 COPIES LTTR ENCL'XTERNAL'.
ie 1
1 LPDR" NTIS 03>>
~gg Q'5 'tS@
0 TOTAL NUMBER OF COPIES REQUIRED!
L(TTR 4+
ENCL(
Ih
)
l' I
C
~
l II e
El di 1'
h
~
II W
I //1'////l//
l/1IZZ1E A NO
// /I////////////'/ 'Milli$
ROCHESTER GAS AND ELECTRIC CORPORATION 4
o 89 EAST AVENUE, ROCHESTER, N.Y. 14649 JOHN E.
MAIER VICE PRESIDENT July 13, 1981 TEI.EPHONK Ave* COOC TIa 54/~2.LQO C
~
a~ 'I~'!
~6)9g JUL,~ox 0 s ~gg,Ice" Director of Nuclear Reactor Regulation Attention:
Mr. Dennis M. Crutchfield, Chief Operating Reactors Branch No.
5 U.
S. Nuclear Regulatory Commission Washington, DC 20555
Subject:
Inadvertent Boron Dilution at Shutdown R. E. Ginna Nuclear Power Plant Docket No. 50-244
Dear Mr. Crutchfield:
This letter is in response to a telephone conversation on July 8, 1981 with you and members of your staff concerning boron dilution at, shutdown.
Inadvertent boron dilution at shutdown has been generally regarded as an event which can be identified and terminated by operator action prior to a return to critical.
In the process of investigating this potential event for new plant licensing, Westinghouse determined that, under certain shutdown conditions with certain assumed dilution rates, adequate time for operator action to prevent, a return to critical may not be available.
Therefore, in a July 9, 1980 Westinghouse letter to Rochester Gas and Electric Corporation (RG&E), Westinghouse presented generic criteria which if followed would allow the plant operator fifteen minutes from the initiation of a dilution event to terminate the event before a return to critical occurs.
Existing RG&E procedures require a boron concentration equivalent to a 2% hp shutdown margin prior to going below 500'F.
Applying the 2% shutdown margin and a maximum dilution rate of 120 gpm to the generic Westinghouse criteria results in at least 15 minutes.
//ICIo/
5 8i07i70i97 8i07i3 P
PDR PDR ADOCK 05000244
ROCHESTER GAS AND ELECTRIC ORP.
July 9, 1981 Mr. Dennis M. Crutchfield SHEET NO.
In summary, the ex'isting procedures at, Ginna combined with the generic Westinghouse criteria result in at least 15 minutes from the initiation of a dilution event until a return to critical.
Very truly yours, Jo n E. Maier